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@@ -1,661 +1,668 b'' | |||
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1 | 1 | """Analysis of text input into executable blocks. |
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2 | 2 | |
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3 | 3 | The main class in this module, :class:`InputSplitter`, is designed to break |
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4 | 4 | input from either interactive, line-by-line environments or block-based ones, |
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5 | 5 | into standalone blocks that can be executed by Python as 'single' statements |
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6 | 6 | (thus triggering sys.displayhook). |
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7 | 7 | |
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8 | 8 | A companion, :class:`IPythonInputSplitter`, provides the same functionality but |
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9 | 9 | with full support for the extended IPython syntax (magics, system calls, etc). |
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10 | 10 | |
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11 | 11 | For more details, see the class docstring below. |
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12 | 12 | |
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13 | 13 | Syntax Transformations |
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14 | 14 | ---------------------- |
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15 | 15 | |
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16 | 16 | One of the main jobs of the code in this file is to apply all syntax |
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17 | 17 | transformations that make up 'the IPython language', i.e. magics, shell |
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18 | 18 | escapes, etc. All transformations should be implemented as *fully stateless* |
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19 | 19 | entities, that simply take one line as their input and return a line. |
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20 | 20 | Internally for implementation purposes they may be a normal function or a |
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21 | 21 | callable object, but the only input they receive will be a single line and they |
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22 | 22 | should only return a line, without holding any data-dependent state between |
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23 | 23 | calls. |
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24 | 24 | |
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25 | 25 | As an example, the EscapedTransformer is a class so we can more clearly group |
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26 | 26 | together the functionality of dispatching to individual functions based on the |
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27 | 27 | starting escape character, but the only method for public use is its call |
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28 | 28 | method. |
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29 | 29 | |
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30 | 30 | |
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31 | 31 | ToDo |
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32 | 32 | ---- |
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33 | 33 | |
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34 | 34 | - Should we make push() actually raise an exception once push_accepts_more() |
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35 | 35 | returns False? |
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36 | 36 | |
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37 | 37 | - Naming cleanups. The tr_* names aren't the most elegant, though now they are |
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38 | 38 | at least just attributes of a class so not really very exposed. |
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39 | 39 | |
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40 | 40 | - Think about the best way to support dynamic things: automagic, autocall, |
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41 | 41 | macros, etc. |
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42 | 42 | |
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43 | 43 | - Think of a better heuristic for the application of the transforms in |
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44 | 44 | IPythonInputSplitter.push() than looking at the buffer ending in ':'. Idea: |
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45 | 45 | track indentation change events (indent, dedent, nothing) and apply them only |
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46 | 46 | if the indentation went up, but not otherwise. |
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47 | 47 | |
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48 | 48 | - Think of the cleanest way for supporting user-specified transformations (the |
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49 | 49 | user prefilters we had before). |
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50 | 50 | |
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51 | 51 | Authors |
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52 | 52 | ------- |
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53 | 53 | |
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54 | 54 | * Fernando Perez |
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55 | 55 | * Brian Granger |
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56 | 56 | """ |
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57 | 57 | #----------------------------------------------------------------------------- |
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58 | 58 | # Copyright (C) 2010 The IPython Development Team |
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59 | 59 | # |
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60 | 60 | # Distributed under the terms of the BSD License. The full license is in |
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61 | 61 | # the file COPYING, distributed as part of this software. |
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62 | 62 | #----------------------------------------------------------------------------- |
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63 | 63 | |
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64 | 64 | #----------------------------------------------------------------------------- |
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65 | 65 | # Imports |
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66 | 66 | #----------------------------------------------------------------------------- |
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67 | 67 | # stdlib |
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68 | 68 | import ast |
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69 | 69 | import codeop |
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70 | 70 | import re |
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71 | 71 | import sys |
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72 | 72 | |
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73 | 73 | # IPython modules |
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74 | 74 | from IPython.utils.py3compat import cast_unicode |
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75 | 75 | from IPython.core.inputtransformer import (leading_indent, |
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76 | 76 | classic_prompt, |
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77 | 77 | ipy_prompt, |
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78 | 78 | strip_encoding_cookie, |
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79 | 79 | cellmagic, |
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80 | 80 | assemble_logical_lines, |
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81 | 81 | help_end, |
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82 | 82 | escaped_commands, |
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83 | 83 | assign_from_magic, |
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84 | 84 | assign_from_system, |
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85 | 85 | assemble_python_lines, |
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86 | 86 | ) |
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87 | 87 | |
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88 | 88 | # These are available in this module for backwards compatibility. |
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89 | 89 | from IPython.core.inputtransformer import (ESC_SHELL, ESC_SH_CAP, ESC_HELP, |
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90 | 90 | ESC_HELP2, ESC_MAGIC, ESC_MAGIC2, |
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91 | 91 | ESC_QUOTE, ESC_QUOTE2, ESC_PAREN, ESC_SEQUENCES) |
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92 | 92 | |
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93 | 93 | #----------------------------------------------------------------------------- |
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94 | 94 | # Utilities |
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95 | 95 | #----------------------------------------------------------------------------- |
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96 | 96 | |
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97 | 97 | # FIXME: These are general-purpose utilities that later can be moved to the |
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98 | 98 | # general ward. Kept here for now because we're being very strict about test |
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99 | 99 | # coverage with this code, and this lets us ensure that we keep 100% coverage |
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100 | 100 | # while developing. |
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101 | 101 | |
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102 | 102 | # compiled regexps for autoindent management |
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103 | 103 | dedent_re = re.compile('|'.join([ |
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104 | 104 | r'^\s+raise(\s.*)?$', # raise statement (+ space + other stuff, maybe) |
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105 | 105 | r'^\s+raise\([^\)]*\).*$', # wacky raise with immediate open paren |
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106 | 106 | r'^\s+return(\s.*)?$', # normal return (+ space + other stuff, maybe) |
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107 | 107 | r'^\s+return\([^\)]*\).*$', # wacky return with immediate open paren |
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108 | 108 | r'^\s+pass\s*$', # pass (optionally followed by trailing spaces) |
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109 | 109 | r'^\s+break\s*$', # break (optionally followed by trailing spaces) |
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110 | 110 | r'^\s+continue\s*$', # continue (optionally followed by trailing spaces) |
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111 | 111 | ])) |
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112 | 112 | ini_spaces_re = re.compile(r'^([ \t\r\f\v]+)') |
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113 | 113 | |
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114 | 114 | # regexp to match pure comment lines so we don't accidentally insert 'if 1:' |
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115 | 115 | # before pure comments |
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116 | 116 | comment_line_re = re.compile('^\s*\#') |
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117 | 117 | |
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118 | 118 | |
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119 | 119 | def num_ini_spaces(s): |
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120 | 120 | """Return the number of initial spaces in a string. |
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121 | 121 | |
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122 | 122 | Note that tabs are counted as a single space. For now, we do *not* support |
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123 | 123 | mixing of tabs and spaces in the user's input. |
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124 | 124 | |
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125 | 125 | Parameters |
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126 | 126 | ---------- |
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127 | 127 | s : string |
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128 | 128 | |
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129 | 129 | Returns |
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130 | 130 | ------- |
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131 | 131 | n : int |
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132 | 132 | """ |
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133 | 133 | |
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134 | 134 | ini_spaces = ini_spaces_re.match(s) |
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135 | 135 | if ini_spaces: |
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136 | 136 | return ini_spaces.end() |
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137 | 137 | else: |
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138 | 138 | return 0 |
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139 | 139 | |
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140 | 140 | def last_blank(src): |
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141 | 141 | """Determine if the input source ends in a blank. |
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142 | 142 | |
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143 | 143 | A blank is either a newline or a line consisting of whitespace. |
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144 | 144 | |
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145 | 145 | Parameters |
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146 | 146 | ---------- |
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147 | 147 | src : string |
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148 | 148 | A single or multiline string. |
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149 | 149 | """ |
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150 | 150 | if not src: return False |
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151 | 151 | ll = src.splitlines()[-1] |
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152 | 152 | return (ll == '') or ll.isspace() |
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153 | 153 | |
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154 | 154 | |
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155 | 155 | last_two_blanks_re = re.compile(r'\n\s*\n\s*$', re.MULTILINE) |
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156 | 156 | last_two_blanks_re2 = re.compile(r'.+\n\s*\n\s+$', re.MULTILINE) |
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157 | 157 | |
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158 | 158 | def last_two_blanks(src): |
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159 | 159 | """Determine if the input source ends in two blanks. |
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160 | 160 | |
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161 | 161 | A blank is either a newline or a line consisting of whitespace. |
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162 | 162 | |
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163 | 163 | Parameters |
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164 | 164 | ---------- |
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165 | 165 | src : string |
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166 | 166 | A single or multiline string. |
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167 | 167 | """ |
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168 | 168 | if not src: return False |
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169 | 169 | # The logic here is tricky: I couldn't get a regexp to work and pass all |
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170 | 170 | # the tests, so I took a different approach: split the source by lines, |
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171 | 171 | # grab the last two and prepend '###\n' as a stand-in for whatever was in |
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172 | 172 | # the body before the last two lines. Then, with that structure, it's |
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173 | 173 | # possible to analyze with two regexps. Not the most elegant solution, but |
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174 | 174 | # it works. If anyone tries to change this logic, make sure to validate |
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175 | 175 | # the whole test suite first! |
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176 | 176 | new_src = '\n'.join(['###\n'] + src.splitlines()[-2:]) |
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177 | 177 | return (bool(last_two_blanks_re.match(new_src)) or |
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178 | 178 | bool(last_two_blanks_re2.match(new_src)) ) |
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179 | 179 | |
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180 | 180 | |
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181 | 181 | def remove_comments(src): |
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182 | 182 | """Remove all comments from input source. |
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183 | 183 | |
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184 | 184 | Note: comments are NOT recognized inside of strings! |
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185 | 185 | |
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186 | 186 | Parameters |
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187 | 187 | ---------- |
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188 | 188 | src : string |
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189 | 189 | A single or multiline input string. |
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190 | 190 | |
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191 | 191 | Returns |
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192 | 192 | ------- |
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193 | 193 | String with all Python comments removed. |
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194 | 194 | """ |
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195 | 195 | |
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196 | 196 | return re.sub('#.*', '', src) |
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197 | 197 | |
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198 | 198 | |
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199 | 199 | def get_input_encoding(): |
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200 | 200 | """Return the default standard input encoding. |
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201 | 201 | |
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202 | 202 | If sys.stdin has no encoding, 'ascii' is returned.""" |
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203 | 203 | # There are strange environments for which sys.stdin.encoding is None. We |
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204 | 204 | # ensure that a valid encoding is returned. |
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205 | 205 | encoding = getattr(sys.stdin, 'encoding', None) |
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206 | 206 | if encoding is None: |
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207 | 207 | encoding = 'ascii' |
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208 | 208 | return encoding |
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209 | 209 | |
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210 | 210 | #----------------------------------------------------------------------------- |
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211 | 211 | # Classes and functions for normal Python syntax handling |
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212 | 212 | #----------------------------------------------------------------------------- |
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213 | 213 | |
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214 | 214 | class InputSplitter(object): |
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215 | 215 | """An object that can accumulate lines of Python source before execution. |
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216 | 216 | |
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217 | 217 | This object is designed to be fed python source line-by-line, using |
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218 | 218 | :meth:`push`. It will return on each push whether the currently pushed |
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219 | 219 | code could be executed already. In addition, it provides a method called |
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220 | 220 | :meth:`push_accepts_more` that can be used to query whether more input |
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221 | 221 | can be pushed into a single interactive block. |
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222 | 222 | |
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223 | 223 | This is a simple example of how an interactive terminal-based client can use |
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224 | 224 | this tool:: |
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225 | 225 | |
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226 | 226 | isp = InputSplitter() |
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227 | 227 | while isp.push_accepts_more(): |
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228 | 228 | indent = ' '*isp.indent_spaces |
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229 | 229 | prompt = '>>> ' + indent |
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230 | 230 | line = indent + raw_input(prompt) |
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231 | 231 | isp.push(line) |
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232 | 232 | print 'Input source was:\n', isp.source_reset(), |
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233 | 233 | """ |
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234 | 234 | # Number of spaces of indentation computed from input that has been pushed |
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235 | 235 | # so far. This is the attributes callers should query to get the current |
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236 | 236 | # indentation level, in order to provide auto-indent facilities. |
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237 | 237 | indent_spaces = 0 |
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238 | 238 | # String, indicating the default input encoding. It is computed by default |
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239 | 239 | # at initialization time via get_input_encoding(), but it can be reset by a |
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240 | 240 | # client with specific knowledge of the encoding. |
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241 | 241 | encoding = '' |
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242 | 242 | # String where the current full source input is stored, properly encoded. |
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243 | 243 | # Reading this attribute is the normal way of querying the currently pushed |
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244 | 244 | # source code, that has been properly encoded. |
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245 | 245 | source = '' |
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246 | 246 | # Code object corresponding to the current source. It is automatically |
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247 | 247 | # synced to the source, so it can be queried at any time to obtain the code |
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248 | 248 | # object; it will be None if the source doesn't compile to valid Python. |
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249 | 249 | code = None |
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250 | 250 | |
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251 | 251 | # Private attributes |
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252 | 252 | |
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253 | 253 | # List with lines of input accumulated so far |
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254 | 254 | _buffer = None |
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255 | 255 | # Command compiler |
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256 | 256 | _compile = None |
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257 | 257 | # Mark when input has changed indentation all the way back to flush-left |
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258 | 258 | _full_dedent = False |
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259 | 259 | # Boolean indicating whether the current block is complete |
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260 | 260 | _is_complete = None |
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261 | 261 | |
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262 | 262 | def __init__(self): |
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263 | 263 | """Create a new InputSplitter instance. |
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264 | 264 | """ |
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265 | 265 | self._buffer = [] |
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266 | 266 | self._compile = codeop.CommandCompiler() |
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267 | 267 | self.encoding = get_input_encoding() |
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268 | 268 | |
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269 | 269 | def reset(self): |
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270 | 270 | """Reset the input buffer and associated state.""" |
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271 | 271 | self.indent_spaces = 0 |
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272 | 272 | self._buffer[:] = [] |
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273 | 273 | self.source = '' |
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274 | 274 | self.code = None |
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275 | 275 | self._is_complete = False |
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276 | 276 | self._full_dedent = False |
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277 | 277 | |
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278 | 278 | def source_reset(self): |
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279 | 279 | """Return the input source and perform a full reset. |
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280 | 280 | """ |
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281 | 281 | out = self.source |
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282 | 282 | self.reset() |
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283 | 283 | return out |
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284 | 284 | |
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285 | 285 | def push(self, lines): |
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286 | 286 | """Push one or more lines of input. |
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287 | 287 | |
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288 | 288 | This stores the given lines and returns a status code indicating |
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289 | 289 | whether the code forms a complete Python block or not. |
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290 | 290 | |
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291 | 291 | Any exceptions generated in compilation are swallowed, but if an |
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292 | 292 | exception was produced, the method returns True. |
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293 | 293 | |
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294 | 294 | Parameters |
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295 | 295 | ---------- |
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296 | 296 | lines : string |
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297 | 297 | One or more lines of Python input. |
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298 | 298 | |
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299 | 299 | Returns |
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300 | 300 | ------- |
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301 | 301 | is_complete : boolean |
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302 | 302 | True if the current input source (the result of the current input |
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303 | 303 | plus prior inputs) forms a complete Python execution block. Note that |
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304 | 304 | this value is also stored as a private attribute (``_is_complete``), so it |
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305 | 305 | can be queried at any time. |
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306 | 306 | """ |
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307 | 307 | self._store(lines) |
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308 | 308 | source = self.source |
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309 | 309 | |
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310 | 310 | # Before calling _compile(), reset the code object to None so that if an |
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311 | 311 | # exception is raised in compilation, we don't mislead by having |
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312 | 312 | # inconsistent code/source attributes. |
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313 | 313 | self.code, self._is_complete = None, None |
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314 | 314 | |
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315 | 315 | # Honor termination lines properly |
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316 | 316 | if source.endswith('\\\n'): |
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317 | 317 | return False |
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318 | 318 | |
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319 | 319 | self._update_indent(lines) |
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320 | 320 | try: |
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321 | 321 | self.code = self._compile(source, symbol="exec") |
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322 | 322 | # Invalid syntax can produce any of a number of different errors from |
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323 | 323 | # inside the compiler, so we have to catch them all. Syntax errors |
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324 | 324 | # immediately produce a 'ready' block, so the invalid Python can be |
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325 | 325 | # sent to the kernel for evaluation with possible ipython |
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326 | 326 | # special-syntax conversion. |
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327 | 327 | except (SyntaxError, OverflowError, ValueError, TypeError, |
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328 | 328 | MemoryError): |
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329 | 329 | self._is_complete = True |
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330 | 330 | else: |
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331 | 331 | # Compilation didn't produce any exceptions (though it may not have |
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332 | 332 | # given a complete code object) |
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333 | 333 | self._is_complete = self.code is not None |
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334 | 334 | |
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335 | 335 | return self._is_complete |
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336 | 336 | |
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337 | 337 | def push_accepts_more(self): |
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338 | 338 | """Return whether a block of interactive input can accept more input. |
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339 | 339 | |
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340 | 340 | This method is meant to be used by line-oriented frontends, who need to |
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341 | 341 | guess whether a block is complete or not based solely on prior and |
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342 | 342 | current input lines. The InputSplitter considers it has a complete |
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343 | 343 | interactive block and will not accept more input when either: |
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344 | 344 | |
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345 | 345 | * A SyntaxError is raised |
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346 | 346 | |
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347 | 347 | * The code is complete and consists of a single line or a single |
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348 | 348 | non-compound statement |
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349 | 349 | |
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350 | 350 | * The code is complete and has a blank line at the end |
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351 | 351 | |
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352 | 352 | If the current input produces a syntax error, this method immediately |
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353 | 353 | returns False but does *not* raise the syntax error exception, as |
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354 | 354 | typically clients will want to send invalid syntax to an execution |
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355 | 355 | backend which might convert the invalid syntax into valid Python via |
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356 | 356 | one of the dynamic IPython mechanisms. |
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357 | 357 | """ |
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358 | 358 | |
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359 | 359 | # With incomplete input, unconditionally accept more |
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360 | 360 | # A syntax error also sets _is_complete to True - see push() |
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361 | 361 | if not self._is_complete: |
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362 | 362 | #print("Not complete") # debug |
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363 | 363 | return True |
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364 | 364 | |
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365 | 365 | # The user can make any (complete) input execute by leaving a blank line |
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366 | 366 | last_line = self.source.splitlines()[-1] |
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367 | 367 | if (not last_line) or last_line.isspace(): |
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368 | 368 | #print("Blank line") # debug |
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369 | 369 | return False |
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370 | 370 | |
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371 | 371 | # If there's just a single line or AST node, and we're flush left, as is |
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372 | 372 | # the case after a simple statement such as 'a=1', we want to execute it |
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373 | 373 | # straight away. |
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374 | 374 | if self.indent_spaces==0: |
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375 | 375 | if len(self.source.splitlines()) <= 1: |
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376 | 376 | return False |
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377 | 377 | |
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378 | 378 | try: |
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379 | 379 | code_ast = ast.parse(u''.join(self._buffer)) |
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380 | 380 | except Exception: |
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381 | 381 | #print("Can't parse AST") # debug |
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382 | 382 | return False |
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383 | 383 | else: |
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384 | 384 | if len(code_ast.body) == 1 and \ |
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385 | 385 | not hasattr(code_ast.body[0], 'body'): |
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386 | 386 | #print("Simple statement") # debug |
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387 | 387 | return False |
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388 | 388 | |
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389 | 389 | # General fallback - accept more code |
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390 | 390 | return True |
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391 | 391 | |
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392 | 392 | #------------------------------------------------------------------------ |
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393 | 393 | # Private interface |
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394 | 394 | #------------------------------------------------------------------------ |
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395 | 395 | |
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396 | 396 | def _find_indent(self, line): |
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397 | 397 | """Compute the new indentation level for a single line. |
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398 | 398 | |
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399 | 399 | Parameters |
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400 | 400 | ---------- |
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401 | 401 | line : str |
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402 | 402 | A single new line of non-whitespace, non-comment Python input. |
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403 | 403 | |
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404 | 404 | Returns |
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405 | 405 | ------- |
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406 | 406 | indent_spaces : int |
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407 | 407 | New value for the indent level (it may be equal to self.indent_spaces |
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408 | 408 | if indentation doesn't change. |
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409 | 409 | |
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410 | 410 | full_dedent : boolean |
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411 | 411 | Whether the new line causes a full flush-left dedent. |
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412 | 412 | """ |
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413 | 413 | indent_spaces = self.indent_spaces |
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414 | 414 | full_dedent = self._full_dedent |
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415 | 415 | |
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416 | 416 | inisp = num_ini_spaces(line) |
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417 | 417 | if inisp < indent_spaces: |
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418 | 418 | indent_spaces = inisp |
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419 | 419 | if indent_spaces <= 0: |
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420 | 420 | #print 'Full dedent in text',self.source # dbg |
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421 | 421 | full_dedent = True |
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422 | 422 | |
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423 | 423 | if line.rstrip()[-1] == ':': |
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424 | 424 | indent_spaces += 4 |
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425 | 425 | elif dedent_re.match(line): |
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426 | 426 | indent_spaces -= 4 |
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427 | 427 | if indent_spaces <= 0: |
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428 | 428 | full_dedent = True |
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429 | 429 | |
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430 | 430 | # Safety |
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431 | 431 | if indent_spaces < 0: |
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432 | 432 | indent_spaces = 0 |
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433 | 433 | #print 'safety' # dbg |
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434 | 434 | |
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435 | 435 | return indent_spaces, full_dedent |
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436 | 436 | |
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437 | 437 | def _update_indent(self, lines): |
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438 | 438 | for line in remove_comments(lines).splitlines(): |
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439 | 439 | if line and not line.isspace(): |
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440 | 440 | self.indent_spaces, self._full_dedent = self._find_indent(line) |
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441 | 441 | |
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442 | 442 | def _store(self, lines, buffer=None, store='source'): |
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443 | 443 | """Store one or more lines of input. |
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444 | 444 | |
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445 | 445 | If input lines are not newline-terminated, a newline is automatically |
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446 | 446 | appended.""" |
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447 | 447 | |
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448 | 448 | if buffer is None: |
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449 | 449 | buffer = self._buffer |
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450 | 450 | |
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451 | 451 | if lines.endswith('\n'): |
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452 | 452 | buffer.append(lines) |
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453 | 453 | else: |
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454 | 454 | buffer.append(lines+'\n') |
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455 | 455 | setattr(self, store, self._set_source(buffer)) |
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456 | 456 | |
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457 | 457 | def _set_source(self, buffer): |
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458 | 458 | return u''.join(buffer) |
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459 | 459 | |
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460 | 460 | |
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461 | 461 | class IPythonInputSplitter(InputSplitter): |
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462 | 462 | """An input splitter that recognizes all of IPython's special syntax.""" |
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463 | 463 | |
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464 | 464 | # String with raw, untransformed input. |
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465 | 465 | source_raw = '' |
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466 | 466 | |
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467 | 467 | # Flag to track when a transformer has stored input that it hasn't given |
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468 | 468 | # back yet. |
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469 | 469 | transformer_accumulating = False |
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470 | 470 | |
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471 | 471 | # Flag to track when assemble_python_lines has stored input that it hasn't |
|
472 | 472 | # given back yet. |
|
473 | 473 | within_python_line = False |
|
474 | 474 | |
|
475 | 475 | # Private attributes |
|
476 | 476 | |
|
477 | 477 | # List with lines of raw input accumulated so far. |
|
478 | 478 | _buffer_raw = None |
|
479 | 479 | |
|
480 | 480 | def __init__(self, line_input_checker=True, physical_line_transforms=None, |
|
481 | 481 | logical_line_transforms=None, python_line_transforms=None): |
|
482 | 482 | super(IPythonInputSplitter, self).__init__() |
|
483 | 483 | self._buffer_raw = [] |
|
484 | 484 | self._validate = True |
|
485 | 485 | |
|
486 | 486 | if physical_line_transforms is not None: |
|
487 | 487 | self.physical_line_transforms = physical_line_transforms |
|
488 | 488 | else: |
|
489 | 489 | self.physical_line_transforms = [ |
|
490 | 490 | leading_indent(), |
|
491 | 491 | classic_prompt(), |
|
492 | 492 | ipy_prompt(), |
|
493 | 493 | strip_encoding_cookie(), |
|
494 | 494 | cellmagic(end_on_blank_line=line_input_checker), |
|
495 | 495 | ] |
|
496 | 496 | |
|
497 | 497 | self.assemble_logical_lines = assemble_logical_lines() |
|
498 | 498 | if logical_line_transforms is not None: |
|
499 | 499 | self.logical_line_transforms = logical_line_transforms |
|
500 | 500 | else: |
|
501 | 501 | self.logical_line_transforms = [ |
|
502 | 502 | help_end(), |
|
503 | 503 | escaped_commands(), |
|
504 | 504 | assign_from_magic(), |
|
505 | 505 | assign_from_system(), |
|
506 | 506 | ] |
|
507 | 507 | |
|
508 | 508 | self.assemble_python_lines = assemble_python_lines() |
|
509 | 509 | if python_line_transforms is not None: |
|
510 | 510 | self.python_line_transforms = python_line_transforms |
|
511 | 511 | else: |
|
512 | 512 | # We don't use any of these at present |
|
513 | 513 | self.python_line_transforms = [] |
|
514 | 514 | |
|
515 | 515 | @property |
|
516 | 516 | def transforms(self): |
|
517 | 517 | "Quick access to all transformers." |
|
518 | 518 | return self.physical_line_transforms + \ |
|
519 | 519 | [self.assemble_logical_lines] + self.logical_line_transforms + \ |
|
520 | 520 | [self.assemble_python_lines] + self.python_line_transforms |
|
521 | 521 | |
|
522 | 522 | @property |
|
523 | 523 | def transforms_in_use(self): |
|
524 | 524 | """Transformers, excluding logical line transformers if we're in a |
|
525 | 525 | Python line.""" |
|
526 | 526 | t = self.physical_line_transforms[:] |
|
527 | 527 | if not self.within_python_line: |
|
528 | 528 | t += [self.assemble_logical_lines] + self.logical_line_transforms |
|
529 | 529 | return t + [self.assemble_python_lines] + self.python_line_transforms |
|
530 | 530 | |
|
531 | 531 | def reset(self): |
|
532 | 532 | """Reset the input buffer and associated state.""" |
|
533 | 533 | super(IPythonInputSplitter, self).reset() |
|
534 | 534 | self._buffer_raw[:] = [] |
|
535 | 535 | self.source_raw = '' |
|
536 | 536 | self.transformer_accumulating = False |
|
537 | 537 | self.within_python_line = False |
|
538 | ||
|
539 | last_exc = None | |
|
538 | 540 | for t in self.transforms: |
|
539 |
t |
|
|
541 | try: | |
|
542 | t.reset() | |
|
543 | except SyntaxError as e: | |
|
544 | last_exc = e | |
|
545 | if last_exc is not None: | |
|
546 | raise last_exc | |
|
540 | 547 | |
|
541 | 548 | def flush_transformers(self): |
|
542 | 549 | def _flush(transform, out): |
|
543 | 550 | if out is not None: |
|
544 | 551 | tmp = transform.push(out) |
|
545 | 552 | return tmp or transform.reset() or None |
|
546 | 553 | else: |
|
547 | 554 | return transform.reset() or None |
|
548 | 555 | |
|
549 | 556 | out = None |
|
550 | 557 | for t in self.transforms_in_use: |
|
551 | 558 | out = _flush(t, out) |
|
552 | 559 | |
|
553 | 560 | if out is not None: |
|
554 | 561 | self._store(out) |
|
555 | 562 | |
|
556 | 563 | def source_raw_reset(self): |
|
557 | 564 | """Return input and raw source and perform a full reset. |
|
558 | 565 | """ |
|
559 | 566 | self.flush_transformers() |
|
560 | 567 | out = self.source |
|
561 | 568 | out_r = self.source_raw |
|
562 | 569 | self.reset() |
|
563 | 570 | return out, out_r |
|
564 | 571 | |
|
565 | 572 | def source_reset(self): |
|
566 | 573 | self.flush_transformers() |
|
567 | 574 | return super(IPythonInputSplitter, self).source_reset() |
|
568 | 575 | |
|
569 | 576 | def push_accepts_more(self): |
|
570 | 577 | if self.transformer_accumulating: |
|
571 | 578 | return True |
|
572 | 579 | else: |
|
573 | 580 | return super(IPythonInputSplitter, self).push_accepts_more() |
|
574 | 581 | |
|
575 | 582 | def transform_cell(self, cell): |
|
576 | 583 | """Process and translate a cell of input. |
|
577 | 584 | """ |
|
578 | 585 | self.reset() |
|
579 | 586 | self.push(cell) |
|
580 | 587 | return self.source_reset() |
|
581 | 588 | |
|
582 | 589 | def push(self, lines): |
|
583 | 590 | """Push one or more lines of IPython input. |
|
584 | 591 | |
|
585 | 592 | This stores the given lines and returns a status code indicating |
|
586 | 593 | whether the code forms a complete Python block or not, after processing |
|
587 | 594 | all input lines for special IPython syntax. |
|
588 | 595 | |
|
589 | 596 | Any exceptions generated in compilation are swallowed, but if an |
|
590 | 597 | exception was produced, the method returns True. |
|
591 | 598 | |
|
592 | 599 | Parameters |
|
593 | 600 | ---------- |
|
594 | 601 | lines : string |
|
595 | 602 | One or more lines of Python input. |
|
596 | 603 | |
|
597 | 604 | Returns |
|
598 | 605 | ------- |
|
599 | 606 | is_complete : boolean |
|
600 | 607 | True if the current input source (the result of the current input |
|
601 | 608 | plus prior inputs) forms a complete Python execution block. Note that |
|
602 | 609 | this value is also stored as a private attribute (_is_complete), so it |
|
603 | 610 | can be queried at any time. |
|
604 | 611 | """ |
|
605 | 612 | |
|
606 | 613 | # We must ensure all input is pure unicode |
|
607 | 614 | lines = cast_unicode(lines, self.encoding) |
|
608 | 615 | |
|
609 | 616 | # ''.splitlines() --> [], but we need to push the empty line to transformers |
|
610 | 617 | lines_list = lines.splitlines() |
|
611 | 618 | if not lines_list: |
|
612 | 619 | lines_list = [''] |
|
613 | 620 | |
|
614 | 621 | # Store raw source before applying any transformations to it. Note |
|
615 | 622 | # that this must be done *after* the reset() call that would otherwise |
|
616 | 623 | # flush the buffer. |
|
617 | 624 | self._store(lines, self._buffer_raw, 'source_raw') |
|
618 | 625 | |
|
619 | 626 | for line in lines_list: |
|
620 | 627 | out = self.push_line(line) |
|
621 | 628 | |
|
622 | 629 | return out |
|
623 | 630 | |
|
624 | 631 | def push_line(self, line): |
|
625 | 632 | buf = self._buffer |
|
626 | 633 | |
|
627 | 634 | def _accumulating(dbg): |
|
628 | 635 | #print(dbg) |
|
629 | 636 | self.transformer_accumulating = True |
|
630 | 637 | return False |
|
631 | 638 | |
|
632 | 639 | for transformer in self.physical_line_transforms: |
|
633 | 640 | line = transformer.push(line) |
|
634 | 641 | if line is None: |
|
635 | 642 | return _accumulating(transformer) |
|
636 | 643 | |
|
637 | 644 | if not self.within_python_line: |
|
638 | 645 | line = self.assemble_logical_lines.push(line) |
|
639 | 646 | if line is None: |
|
640 | 647 | return _accumulating('acc logical line') |
|
641 | 648 | |
|
642 | 649 | for transformer in self.logical_line_transforms: |
|
643 | 650 | line = transformer.push(line) |
|
644 | 651 | if line is None: |
|
645 | 652 | return _accumulating(transformer) |
|
646 | 653 | |
|
647 | 654 | line = self.assemble_python_lines.push(line) |
|
648 | 655 | if line is None: |
|
649 | 656 | self.within_python_line = True |
|
650 | 657 | return _accumulating('acc python line') |
|
651 | 658 | else: |
|
652 | 659 | self.within_python_line = False |
|
653 | 660 | |
|
654 | 661 | for transformer in self.python_line_transforms: |
|
655 | 662 | line = transformer.push(line) |
|
656 | 663 | if line is None: |
|
657 | 664 | return _accumulating(transformer) |
|
658 | 665 | |
|
659 | 666 | #print("transformers clear") #debug |
|
660 | 667 | self.transformer_accumulating = False |
|
661 | 668 | return super(IPythonInputSplitter, self).push(line) |
@@ -1,784 +1,793 b'' | |||
|
1 | 1 | from __future__ import print_function |
|
2 | 2 | |
|
3 | 3 | # Standard library imports |
|
4 | 4 | from collections import namedtuple |
|
5 | 5 | import sys |
|
6 | 6 | import uuid |
|
7 | 7 | |
|
8 | 8 | # System library imports |
|
9 | 9 | from pygments.lexers import PythonLexer |
|
10 | 10 | from IPython.external import qt |
|
11 | 11 | from IPython.external.qt import QtCore, QtGui |
|
12 | 12 | |
|
13 | 13 | # Local imports |
|
14 | 14 | from IPython.core.inputsplitter import InputSplitter, IPythonInputSplitter |
|
15 | 15 | from IPython.core.inputtransformer import classic_prompt |
|
16 | 16 | from IPython.core.oinspect import call_tip |
|
17 | 17 | from IPython.qt.base_frontend_mixin import BaseFrontendMixin |
|
18 | 18 | from IPython.utils.traitlets import Bool, Instance, Unicode |
|
19 | 19 | from .bracket_matcher import BracketMatcher |
|
20 | 20 | from .call_tip_widget import CallTipWidget |
|
21 | 21 | from .completion_lexer import CompletionLexer |
|
22 | 22 | from .history_console_widget import HistoryConsoleWidget |
|
23 | 23 | from .pygments_highlighter import PygmentsHighlighter |
|
24 | 24 | |
|
25 | 25 | |
|
26 | 26 | class FrontendHighlighter(PygmentsHighlighter): |
|
27 | 27 | """ A PygmentsHighlighter that understands and ignores prompts. |
|
28 | 28 | """ |
|
29 | 29 | |
|
30 | 30 | def __init__(self, frontend): |
|
31 | 31 | super(FrontendHighlighter, self).__init__(frontend._control.document()) |
|
32 | 32 | self._current_offset = 0 |
|
33 | 33 | self._frontend = frontend |
|
34 | 34 | self.highlighting_on = False |
|
35 | 35 | |
|
36 | 36 | def highlightBlock(self, string): |
|
37 | 37 | """ Highlight a block of text. Reimplemented to highlight selectively. |
|
38 | 38 | """ |
|
39 | 39 | if not self.highlighting_on: |
|
40 | 40 | return |
|
41 | 41 | |
|
42 | 42 | # The input to this function is a unicode string that may contain |
|
43 | 43 | # paragraph break characters, non-breaking spaces, etc. Here we acquire |
|
44 | 44 | # the string as plain text so we can compare it. |
|
45 | 45 | current_block = self.currentBlock() |
|
46 | 46 | string = self._frontend._get_block_plain_text(current_block) |
|
47 | 47 | |
|
48 | 48 | # Decide whether to check for the regular or continuation prompt. |
|
49 | 49 | if current_block.contains(self._frontend._prompt_pos): |
|
50 | 50 | prompt = self._frontend._prompt |
|
51 | 51 | else: |
|
52 | 52 | prompt = self._frontend._continuation_prompt |
|
53 | 53 | |
|
54 | 54 | # Only highlight if we can identify a prompt, but make sure not to |
|
55 | 55 | # highlight the prompt. |
|
56 | 56 | if string.startswith(prompt): |
|
57 | 57 | self._current_offset = len(prompt) |
|
58 | 58 | string = string[len(prompt):] |
|
59 | 59 | super(FrontendHighlighter, self).highlightBlock(string) |
|
60 | 60 | |
|
61 | 61 | def rehighlightBlock(self, block): |
|
62 | 62 | """ Reimplemented to temporarily enable highlighting if disabled. |
|
63 | 63 | """ |
|
64 | 64 | old = self.highlighting_on |
|
65 | 65 | self.highlighting_on = True |
|
66 | 66 | super(FrontendHighlighter, self).rehighlightBlock(block) |
|
67 | 67 | self.highlighting_on = old |
|
68 | 68 | |
|
69 | 69 | def setFormat(self, start, count, format): |
|
70 | 70 | """ Reimplemented to highlight selectively. |
|
71 | 71 | """ |
|
72 | 72 | start += self._current_offset |
|
73 | 73 | super(FrontendHighlighter, self).setFormat(start, count, format) |
|
74 | 74 | |
|
75 | 75 | |
|
76 | 76 | class FrontendWidget(HistoryConsoleWidget, BaseFrontendMixin): |
|
77 | 77 | """ A Qt frontend for a generic Python kernel. |
|
78 | 78 | """ |
|
79 | 79 | |
|
80 | 80 | # The text to show when the kernel is (re)started. |
|
81 | 81 | banner = Unicode(config=True) |
|
82 | 82 | |
|
83 | 83 | # An option and corresponding signal for overriding the default kernel |
|
84 | 84 | # interrupt behavior. |
|
85 | 85 | custom_interrupt = Bool(False) |
|
86 | 86 | custom_interrupt_requested = QtCore.Signal() |
|
87 | 87 | |
|
88 | 88 | # An option and corresponding signals for overriding the default kernel |
|
89 | 89 | # restart behavior. |
|
90 | 90 | custom_restart = Bool(False) |
|
91 | 91 | custom_restart_kernel_died = QtCore.Signal(float) |
|
92 | 92 | custom_restart_requested = QtCore.Signal() |
|
93 | 93 | |
|
94 | 94 | # Whether to automatically show calltips on open-parentheses. |
|
95 | 95 | enable_calltips = Bool(True, config=True, |
|
96 | 96 | help="Whether to draw information calltips on open-parentheses.") |
|
97 | 97 | |
|
98 | 98 | clear_on_kernel_restart = Bool(True, config=True, |
|
99 | 99 | help="Whether to clear the console when the kernel is restarted") |
|
100 | 100 | |
|
101 | 101 | confirm_restart = Bool(True, config=True, |
|
102 | 102 | help="Whether to ask for user confirmation when restarting kernel") |
|
103 | 103 | |
|
104 | 104 | # Emitted when a user visible 'execute_request' has been submitted to the |
|
105 | 105 | # kernel from the FrontendWidget. Contains the code to be executed. |
|
106 | 106 | executing = QtCore.Signal(object) |
|
107 | 107 | |
|
108 | 108 | # Emitted when a user-visible 'execute_reply' has been received from the |
|
109 | 109 | # kernel and processed by the FrontendWidget. Contains the response message. |
|
110 | 110 | executed = QtCore.Signal(object) |
|
111 | 111 | |
|
112 | 112 | # Emitted when an exit request has been received from the kernel. |
|
113 | 113 | exit_requested = QtCore.Signal(object) |
|
114 | 114 | |
|
115 | 115 | # Protected class variables. |
|
116 | 116 | _prompt_transformer = IPythonInputSplitter(physical_line_transforms=[classic_prompt()], |
|
117 | 117 | logical_line_transforms=[], |
|
118 | 118 | python_line_transforms=[], |
|
119 | 119 | ) |
|
120 | 120 | _CallTipRequest = namedtuple('_CallTipRequest', ['id', 'pos']) |
|
121 | 121 | _CompletionRequest = namedtuple('_CompletionRequest', ['id', 'pos']) |
|
122 | 122 | _ExecutionRequest = namedtuple('_ExecutionRequest', ['id', 'kind']) |
|
123 | 123 | _input_splitter_class = InputSplitter |
|
124 | 124 | _local_kernel = False |
|
125 | 125 | _highlighter = Instance(FrontendHighlighter) |
|
126 | 126 | |
|
127 | 127 | #--------------------------------------------------------------------------- |
|
128 | 128 | # 'object' interface |
|
129 | 129 | #--------------------------------------------------------------------------- |
|
130 | 130 | |
|
131 | 131 | def __init__(self, *args, **kw): |
|
132 | 132 | super(FrontendWidget, self).__init__(*args, **kw) |
|
133 | 133 | # FIXME: remove this when PySide min version is updated past 1.0.7 |
|
134 | 134 | # forcefully disable calltips if PySide is < 1.0.7, because they crash |
|
135 | 135 | if qt.QT_API == qt.QT_API_PYSIDE: |
|
136 | 136 | import PySide |
|
137 | 137 | if PySide.__version_info__ < (1,0,7): |
|
138 | 138 | self.log.warn("PySide %s < 1.0.7 detected, disabling calltips" % PySide.__version__) |
|
139 | 139 | self.enable_calltips = False |
|
140 | 140 | |
|
141 | 141 | # FrontendWidget protected variables. |
|
142 | 142 | self._bracket_matcher = BracketMatcher(self._control) |
|
143 | 143 | self._call_tip_widget = CallTipWidget(self._control) |
|
144 | 144 | self._completion_lexer = CompletionLexer(PythonLexer()) |
|
145 | 145 | self._copy_raw_action = QtGui.QAction('Copy (Raw Text)', None) |
|
146 | 146 | self._hidden = False |
|
147 | 147 | self._highlighter = FrontendHighlighter(self) |
|
148 | 148 | self._input_splitter = self._input_splitter_class() |
|
149 | 149 | self._kernel_manager = None |
|
150 | 150 | self._kernel_client = None |
|
151 | 151 | self._request_info = {} |
|
152 | 152 | self._request_info['execute'] = {}; |
|
153 | 153 | self._callback_dict = {} |
|
154 | 154 | |
|
155 | 155 | # Configure the ConsoleWidget. |
|
156 | 156 | self.tab_width = 4 |
|
157 | 157 | self._set_continuation_prompt('... ') |
|
158 | 158 | |
|
159 | 159 | # Configure the CallTipWidget. |
|
160 | 160 | self._call_tip_widget.setFont(self.font) |
|
161 | 161 | self.font_changed.connect(self._call_tip_widget.setFont) |
|
162 | 162 | |
|
163 | 163 | # Configure actions. |
|
164 | 164 | action = self._copy_raw_action |
|
165 | 165 | key = QtCore.Qt.CTRL | QtCore.Qt.SHIFT | QtCore.Qt.Key_C |
|
166 | 166 | action.setEnabled(False) |
|
167 | 167 | action.setShortcut(QtGui.QKeySequence(key)) |
|
168 | 168 | action.setShortcutContext(QtCore.Qt.WidgetWithChildrenShortcut) |
|
169 | 169 | action.triggered.connect(self.copy_raw) |
|
170 | 170 | self.copy_available.connect(action.setEnabled) |
|
171 | 171 | self.addAction(action) |
|
172 | 172 | |
|
173 | 173 | # Connect signal handlers. |
|
174 | 174 | document = self._control.document() |
|
175 | 175 | document.contentsChange.connect(self._document_contents_change) |
|
176 | 176 | |
|
177 | 177 | # Set flag for whether we are connected via localhost. |
|
178 | 178 | self._local_kernel = kw.get('local_kernel', |
|
179 | 179 | FrontendWidget._local_kernel) |
|
180 | 180 | |
|
181 | 181 | #--------------------------------------------------------------------------- |
|
182 | 182 | # 'ConsoleWidget' public interface |
|
183 | 183 | #--------------------------------------------------------------------------- |
|
184 | 184 | |
|
185 | 185 | def copy(self): |
|
186 | 186 | """ Copy the currently selected text to the clipboard, removing prompts. |
|
187 | 187 | """ |
|
188 | 188 | if self._page_control is not None and self._page_control.hasFocus(): |
|
189 | 189 | self._page_control.copy() |
|
190 | 190 | elif self._control.hasFocus(): |
|
191 | 191 | text = self._control.textCursor().selection().toPlainText() |
|
192 | 192 | if text: |
|
193 | 193 | text = self._prompt_transformer.transform_cell(text) |
|
194 | 194 | QtGui.QApplication.clipboard().setText(text) |
|
195 | 195 | else: |
|
196 | 196 | self.log.debug("frontend widget : unknown copy target") |
|
197 | 197 | |
|
198 | 198 | #--------------------------------------------------------------------------- |
|
199 | 199 | # 'ConsoleWidget' abstract interface |
|
200 | 200 | #--------------------------------------------------------------------------- |
|
201 | 201 | |
|
202 | 202 | def _is_complete(self, source, interactive): |
|
203 | 203 | """ Returns whether 'source' can be completely processed and a new |
|
204 | 204 | prompt created. When triggered by an Enter/Return key press, |
|
205 | 205 | 'interactive' is True; otherwise, it is False. |
|
206 | 206 | """ |
|
207 | self._input_splitter.reset() | |
|
208 |
|
|
|
207 | try: | |
|
208 | self._input_splitter.reset() | |
|
209 | except SyntaxError: | |
|
210 | pass | |
|
211 | try: | |
|
212 | complete = self._input_splitter.push(source) | |
|
213 | except SyntaxError: | |
|
214 | return True | |
|
209 | 215 | if interactive: |
|
210 | 216 | complete = not self._input_splitter.push_accepts_more() |
|
211 | 217 | return complete |
|
212 | 218 | |
|
213 | 219 | def _execute(self, source, hidden): |
|
214 | 220 | """ Execute 'source'. If 'hidden', do not show any output. |
|
215 | 221 | |
|
216 | 222 | See parent class :meth:`execute` docstring for full details. |
|
217 | 223 | """ |
|
218 | 224 | msg_id = self.kernel_client.execute(source, hidden) |
|
219 | 225 | self._request_info['execute'][msg_id] = self._ExecutionRequest(msg_id, 'user') |
|
220 | 226 | self._hidden = hidden |
|
221 | 227 | if not hidden: |
|
222 | 228 | self.executing.emit(source) |
|
223 | 229 | |
|
224 | 230 | def _prompt_started_hook(self): |
|
225 | 231 | """ Called immediately after a new prompt is displayed. |
|
226 | 232 | """ |
|
227 | 233 | if not self._reading: |
|
228 | 234 | self._highlighter.highlighting_on = True |
|
229 | 235 | |
|
230 | 236 | def _prompt_finished_hook(self): |
|
231 | 237 | """ Called immediately after a prompt is finished, i.e. when some input |
|
232 | 238 | will be processed and a new prompt displayed. |
|
233 | 239 | """ |
|
234 | 240 | # Flush all state from the input splitter so the next round of |
|
235 | 241 | # reading input starts with a clean buffer. |
|
236 | self._input_splitter.reset() | |
|
242 | try: | |
|
243 | self._input_splitter.reset() | |
|
244 | except SyntaxError: | |
|
245 | pass | |
|
237 | 246 | |
|
238 | 247 | if not self._reading: |
|
239 | 248 | self._highlighter.highlighting_on = False |
|
240 | 249 | |
|
241 | 250 | def _tab_pressed(self): |
|
242 | 251 | """ Called when the tab key is pressed. Returns whether to continue |
|
243 | 252 | processing the event. |
|
244 | 253 | """ |
|
245 | 254 | # Perform tab completion if: |
|
246 | 255 | # 1) The cursor is in the input buffer. |
|
247 | 256 | # 2) There is a non-whitespace character before the cursor. |
|
248 | 257 | text = self._get_input_buffer_cursor_line() |
|
249 | 258 | if text is None: |
|
250 | 259 | return False |
|
251 | 260 | complete = bool(text[:self._get_input_buffer_cursor_column()].strip()) |
|
252 | 261 | if complete: |
|
253 | 262 | self._complete() |
|
254 | 263 | return not complete |
|
255 | 264 | |
|
256 | 265 | #--------------------------------------------------------------------------- |
|
257 | 266 | # 'ConsoleWidget' protected interface |
|
258 | 267 | #--------------------------------------------------------------------------- |
|
259 | 268 | |
|
260 | 269 | def _context_menu_make(self, pos): |
|
261 | 270 | """ Reimplemented to add an action for raw copy. |
|
262 | 271 | """ |
|
263 | 272 | menu = super(FrontendWidget, self)._context_menu_make(pos) |
|
264 | 273 | for before_action in menu.actions(): |
|
265 | 274 | if before_action.shortcut().matches(QtGui.QKeySequence.Paste) == \ |
|
266 | 275 | QtGui.QKeySequence.ExactMatch: |
|
267 | 276 | menu.insertAction(before_action, self._copy_raw_action) |
|
268 | 277 | break |
|
269 | 278 | return menu |
|
270 | 279 | |
|
271 | 280 | def request_interrupt_kernel(self): |
|
272 | 281 | if self._executing: |
|
273 | 282 | self.interrupt_kernel() |
|
274 | 283 | |
|
275 | 284 | def request_restart_kernel(self): |
|
276 | 285 | message = 'Are you sure you want to restart the kernel?' |
|
277 | 286 | self.restart_kernel(message, now=False) |
|
278 | 287 | |
|
279 | 288 | def _event_filter_console_keypress(self, event): |
|
280 | 289 | """ Reimplemented for execution interruption and smart backspace. |
|
281 | 290 | """ |
|
282 | 291 | key = event.key() |
|
283 | 292 | if self._control_key_down(event.modifiers(), include_command=False): |
|
284 | 293 | |
|
285 | 294 | if key == QtCore.Qt.Key_C and self._executing: |
|
286 | 295 | self.request_interrupt_kernel() |
|
287 | 296 | return True |
|
288 | 297 | |
|
289 | 298 | elif key == QtCore.Qt.Key_Period: |
|
290 | 299 | self.request_restart_kernel() |
|
291 | 300 | return True |
|
292 | 301 | |
|
293 | 302 | elif not event.modifiers() & QtCore.Qt.AltModifier: |
|
294 | 303 | |
|
295 | 304 | # Smart backspace: remove four characters in one backspace if: |
|
296 | 305 | # 1) everything left of the cursor is whitespace |
|
297 | 306 | # 2) the four characters immediately left of the cursor are spaces |
|
298 | 307 | if key == QtCore.Qt.Key_Backspace: |
|
299 | 308 | col = self._get_input_buffer_cursor_column() |
|
300 | 309 | cursor = self._control.textCursor() |
|
301 | 310 | if col > 3 and not cursor.hasSelection(): |
|
302 | 311 | text = self._get_input_buffer_cursor_line()[:col] |
|
303 | 312 | if text.endswith(' ') and not text.strip(): |
|
304 | 313 | cursor.movePosition(QtGui.QTextCursor.Left, |
|
305 | 314 | QtGui.QTextCursor.KeepAnchor, 4) |
|
306 | 315 | cursor.removeSelectedText() |
|
307 | 316 | return True |
|
308 | 317 | |
|
309 | 318 | return super(FrontendWidget, self)._event_filter_console_keypress(event) |
|
310 | 319 | |
|
311 | 320 | def _insert_continuation_prompt(self, cursor): |
|
312 | 321 | """ Reimplemented for auto-indentation. |
|
313 | 322 | """ |
|
314 | 323 | super(FrontendWidget, self)._insert_continuation_prompt(cursor) |
|
315 | 324 | cursor.insertText(' ' * self._input_splitter.indent_spaces) |
|
316 | 325 | |
|
317 | 326 | #--------------------------------------------------------------------------- |
|
318 | 327 | # 'BaseFrontendMixin' abstract interface |
|
319 | 328 | #--------------------------------------------------------------------------- |
|
320 | 329 | |
|
321 | 330 | def _handle_complete_reply(self, rep): |
|
322 | 331 | """ Handle replies for tab completion. |
|
323 | 332 | """ |
|
324 | 333 | self.log.debug("complete: %s", rep.get('content', '')) |
|
325 | 334 | cursor = self._get_cursor() |
|
326 | 335 | info = self._request_info.get('complete') |
|
327 | 336 | if info and info.id == rep['parent_header']['msg_id'] and \ |
|
328 | 337 | info.pos == cursor.position(): |
|
329 | 338 | text = '.'.join(self._get_context()) |
|
330 | 339 | cursor.movePosition(QtGui.QTextCursor.Left, n=len(text)) |
|
331 | 340 | self._complete_with_items(cursor, rep['content']['matches']) |
|
332 | 341 | |
|
333 | 342 | def _silent_exec_callback(self, expr, callback): |
|
334 | 343 | """Silently execute `expr` in the kernel and call `callback` with reply |
|
335 | 344 | |
|
336 | 345 | the `expr` is evaluated silently in the kernel (without) output in |
|
337 | 346 | the frontend. Call `callback` with the |
|
338 | 347 | `repr <http://docs.python.org/library/functions.html#repr> `_ as first argument |
|
339 | 348 | |
|
340 | 349 | Parameters |
|
341 | 350 | ---------- |
|
342 | 351 | expr : string |
|
343 | 352 | valid string to be executed by the kernel. |
|
344 | 353 | callback : function |
|
345 | 354 | function accepting one argument, as a string. The string will be |
|
346 | 355 | the `repr` of the result of evaluating `expr` |
|
347 | 356 | |
|
348 | 357 | The `callback` is called with the `repr()` of the result of `expr` as |
|
349 | 358 | first argument. To get the object, do `eval()` on the passed value. |
|
350 | 359 | |
|
351 | 360 | See Also |
|
352 | 361 | -------- |
|
353 | 362 | _handle_exec_callback : private method, deal with calling callback with reply |
|
354 | 363 | |
|
355 | 364 | """ |
|
356 | 365 | |
|
357 | 366 | # generate uuid, which would be used as an indication of whether or |
|
358 | 367 | # not the unique request originated from here (can use msg id ?) |
|
359 | 368 | local_uuid = str(uuid.uuid1()) |
|
360 | 369 | msg_id = self.kernel_client.execute('', |
|
361 | 370 | silent=True, user_expressions={ local_uuid:expr }) |
|
362 | 371 | self._callback_dict[local_uuid] = callback |
|
363 | 372 | self._request_info['execute'][msg_id] = self._ExecutionRequest(msg_id, 'silent_exec_callback') |
|
364 | 373 | |
|
365 | 374 | def _handle_exec_callback(self, msg): |
|
366 | 375 | """Execute `callback` corresponding to `msg` reply, after ``_silent_exec_callback`` |
|
367 | 376 | |
|
368 | 377 | Parameters |
|
369 | 378 | ---------- |
|
370 | 379 | msg : raw message send by the kernel containing an `user_expressions` |
|
371 | 380 | and having a 'silent_exec_callback' kind. |
|
372 | 381 | |
|
373 | 382 | Notes |
|
374 | 383 | ----- |
|
375 | 384 | This function will look for a `callback` associated with the |
|
376 | 385 | corresponding message id. Association has been made by |
|
377 | 386 | `_silent_exec_callback`. `callback` is then called with the `repr()` |
|
378 | 387 | of the value of corresponding `user_expressions` as argument. |
|
379 | 388 | `callback` is then removed from the known list so that any message |
|
380 | 389 | coming again with the same id won't trigger it. |
|
381 | 390 | |
|
382 | 391 | """ |
|
383 | 392 | |
|
384 | 393 | user_exp = msg['content'].get('user_expressions') |
|
385 | 394 | if not user_exp: |
|
386 | 395 | return |
|
387 | 396 | for expression in user_exp: |
|
388 | 397 | if expression in self._callback_dict: |
|
389 | 398 | self._callback_dict.pop(expression)(user_exp[expression]) |
|
390 | 399 | |
|
391 | 400 | def _handle_execute_reply(self, msg): |
|
392 | 401 | """ Handles replies for code execution. |
|
393 | 402 | """ |
|
394 | 403 | self.log.debug("execute: %s", msg.get('content', '')) |
|
395 | 404 | msg_id = msg['parent_header']['msg_id'] |
|
396 | 405 | info = self._request_info['execute'].get(msg_id) |
|
397 | 406 | # unset reading flag, because if execute finished, raw_input can't |
|
398 | 407 | # still be pending. |
|
399 | 408 | self._reading = False |
|
400 | 409 | if info and info.kind == 'user' and not self._hidden: |
|
401 | 410 | # Make sure that all output from the SUB channel has been processed |
|
402 | 411 | # before writing a new prompt. |
|
403 | 412 | self.kernel_client.iopub_channel.flush() |
|
404 | 413 | |
|
405 | 414 | # Reset the ANSI style information to prevent bad text in stdout |
|
406 | 415 | # from messing up our colors. We're not a true terminal so we're |
|
407 | 416 | # allowed to do this. |
|
408 | 417 | if self.ansi_codes: |
|
409 | 418 | self._ansi_processor.reset_sgr() |
|
410 | 419 | |
|
411 | 420 | content = msg['content'] |
|
412 | 421 | status = content['status'] |
|
413 | 422 | if status == 'ok': |
|
414 | 423 | self._process_execute_ok(msg) |
|
415 | 424 | elif status == 'error': |
|
416 | 425 | self._process_execute_error(msg) |
|
417 | 426 | elif status == 'aborted': |
|
418 | 427 | self._process_execute_abort(msg) |
|
419 | 428 | |
|
420 | 429 | self._show_interpreter_prompt_for_reply(msg) |
|
421 | 430 | self.executed.emit(msg) |
|
422 | 431 | self._request_info['execute'].pop(msg_id) |
|
423 | 432 | elif info and info.kind == 'silent_exec_callback' and not self._hidden: |
|
424 | 433 | self._handle_exec_callback(msg) |
|
425 | 434 | self._request_info['execute'].pop(msg_id) |
|
426 | 435 | else: |
|
427 | 436 | super(FrontendWidget, self)._handle_execute_reply(msg) |
|
428 | 437 | |
|
429 | 438 | def _handle_input_request(self, msg): |
|
430 | 439 | """ Handle requests for raw_input. |
|
431 | 440 | """ |
|
432 | 441 | self.log.debug("input: %s", msg.get('content', '')) |
|
433 | 442 | if self._hidden: |
|
434 | 443 | raise RuntimeError('Request for raw input during hidden execution.') |
|
435 | 444 | |
|
436 | 445 | # Make sure that all output from the SUB channel has been processed |
|
437 | 446 | # before entering readline mode. |
|
438 | 447 | self.kernel_client.iopub_channel.flush() |
|
439 | 448 | |
|
440 | 449 | def callback(line): |
|
441 | 450 | self.kernel_client.stdin_channel.input(line) |
|
442 | 451 | if self._reading: |
|
443 | 452 | self.log.debug("Got second input request, assuming first was interrupted.") |
|
444 | 453 | self._reading = False |
|
445 | 454 | self._readline(msg['content']['prompt'], callback=callback) |
|
446 | 455 | |
|
447 | 456 | def _kernel_restarted_message(self, died=True): |
|
448 | 457 | msg = "Kernel died, restarting" if died else "Kernel restarting" |
|
449 | 458 | self._append_html("<br>%s<hr><br>" % msg, |
|
450 | 459 | before_prompt=False |
|
451 | 460 | ) |
|
452 | 461 | |
|
453 | 462 | def _handle_kernel_died(self, since_last_heartbeat): |
|
454 | 463 | """Handle the kernel's death (if we do not own the kernel). |
|
455 | 464 | """ |
|
456 | 465 | self.log.warn("kernel died: %s", since_last_heartbeat) |
|
457 | 466 | if self.custom_restart: |
|
458 | 467 | self.custom_restart_kernel_died.emit(since_last_heartbeat) |
|
459 | 468 | else: |
|
460 | 469 | self._kernel_restarted_message(died=True) |
|
461 | 470 | self.reset() |
|
462 | 471 | |
|
463 | 472 | def _handle_kernel_restarted(self, died=True): |
|
464 | 473 | """Notice that the autorestarter restarted the kernel. |
|
465 | 474 | |
|
466 | 475 | There's nothing to do but show a message. |
|
467 | 476 | """ |
|
468 | 477 | self.log.warn("kernel restarted") |
|
469 | 478 | self._kernel_restarted_message(died=died) |
|
470 | 479 | self.reset() |
|
471 | 480 | |
|
472 | 481 | def _handle_object_info_reply(self, rep): |
|
473 | 482 | """ Handle replies for call tips. |
|
474 | 483 | """ |
|
475 | 484 | self.log.debug("oinfo: %s", rep.get('content', '')) |
|
476 | 485 | cursor = self._get_cursor() |
|
477 | 486 | info = self._request_info.get('call_tip') |
|
478 | 487 | if info and info.id == rep['parent_header']['msg_id'] and \ |
|
479 | 488 | info.pos == cursor.position(): |
|
480 | 489 | # Get the information for a call tip. For now we format the call |
|
481 | 490 | # line as string, later we can pass False to format_call and |
|
482 | 491 | # syntax-highlight it ourselves for nicer formatting in the |
|
483 | 492 | # calltip. |
|
484 | 493 | content = rep['content'] |
|
485 | 494 | # if this is from pykernel, 'docstring' will be the only key |
|
486 | 495 | if content.get('ismagic', False): |
|
487 | 496 | # Don't generate a call-tip for magics. Ideally, we should |
|
488 | 497 | # generate a tooltip, but not on ( like we do for actual |
|
489 | 498 | # callables. |
|
490 | 499 | call_info, doc = None, None |
|
491 | 500 | else: |
|
492 | 501 | call_info, doc = call_tip(content, format_call=True) |
|
493 | 502 | if call_info or doc: |
|
494 | 503 | self._call_tip_widget.show_call_info(call_info, doc) |
|
495 | 504 | |
|
496 | 505 | def _handle_pyout(self, msg): |
|
497 | 506 | """ Handle display hook output. |
|
498 | 507 | """ |
|
499 | 508 | self.log.debug("pyout: %s", msg.get('content', '')) |
|
500 | 509 | if not self._hidden and self._is_from_this_session(msg): |
|
501 | 510 | text = msg['content']['data'] |
|
502 | 511 | self._append_plain_text(text + '\n', before_prompt=True) |
|
503 | 512 | |
|
504 | 513 | def _handle_stream(self, msg): |
|
505 | 514 | """ Handle stdout, stderr, and stdin. |
|
506 | 515 | """ |
|
507 | 516 | self.log.debug("stream: %s", msg.get('content', '')) |
|
508 | 517 | if not self._hidden and self._is_from_this_session(msg): |
|
509 | 518 | # Most consoles treat tabs as being 8 space characters. Convert tabs |
|
510 | 519 | # to spaces so that output looks as expected regardless of this |
|
511 | 520 | # widget's tab width. |
|
512 | 521 | text = msg['content']['data'].expandtabs(8) |
|
513 | 522 | |
|
514 | 523 | self._append_plain_text(text, before_prompt=True) |
|
515 | 524 | self._control.moveCursor(QtGui.QTextCursor.End) |
|
516 | 525 | |
|
517 | 526 | def _handle_shutdown_reply(self, msg): |
|
518 | 527 | """ Handle shutdown signal, only if from other console. |
|
519 | 528 | """ |
|
520 | 529 | self.log.warn("shutdown: %s", msg.get('content', '')) |
|
521 | 530 | restart = msg.get('content', {}).get('restart', False) |
|
522 | 531 | if not self._hidden and not self._is_from_this_session(msg): |
|
523 | 532 | # got shutdown reply, request came from session other than ours |
|
524 | 533 | if restart: |
|
525 | 534 | # someone restarted the kernel, handle it |
|
526 | 535 | self._handle_kernel_restarted(died=False) |
|
527 | 536 | else: |
|
528 | 537 | # kernel was shutdown permanently |
|
529 | 538 | # this triggers exit_requested if the kernel was local, |
|
530 | 539 | # and a dialog if the kernel was remote, |
|
531 | 540 | # so we don't suddenly clear the qtconsole without asking. |
|
532 | 541 | if self._local_kernel: |
|
533 | 542 | self.exit_requested.emit(self) |
|
534 | 543 | else: |
|
535 | 544 | title = self.window().windowTitle() |
|
536 | 545 | reply = QtGui.QMessageBox.question(self, title, |
|
537 | 546 | "Kernel has been shutdown permanently. " |
|
538 | 547 | "Close the Console?", |
|
539 | 548 | QtGui.QMessageBox.Yes,QtGui.QMessageBox.No) |
|
540 | 549 | if reply == QtGui.QMessageBox.Yes: |
|
541 | 550 | self.exit_requested.emit(self) |
|
542 | 551 | |
|
543 | 552 | def _handle_status(self, msg): |
|
544 | 553 | """Handle status message""" |
|
545 | 554 | # This is where a busy/idle indicator would be triggered, |
|
546 | 555 | # when we make one. |
|
547 | 556 | state = msg['content'].get('execution_state', '') |
|
548 | 557 | if state == 'starting': |
|
549 | 558 | # kernel started while we were running |
|
550 | 559 | if self._executing: |
|
551 | 560 | self._handle_kernel_restarted(died=True) |
|
552 | 561 | elif state == 'idle': |
|
553 | 562 | pass |
|
554 | 563 | elif state == 'busy': |
|
555 | 564 | pass |
|
556 | 565 | |
|
557 | 566 | def _started_channels(self): |
|
558 | 567 | """ Called when the KernelManager channels have started listening or |
|
559 | 568 | when the frontend is assigned an already listening KernelManager. |
|
560 | 569 | """ |
|
561 | 570 | self.reset(clear=True) |
|
562 | 571 | |
|
563 | 572 | #--------------------------------------------------------------------------- |
|
564 | 573 | # 'FrontendWidget' public interface |
|
565 | 574 | #--------------------------------------------------------------------------- |
|
566 | 575 | |
|
567 | 576 | def copy_raw(self): |
|
568 | 577 | """ Copy the currently selected text to the clipboard without attempting |
|
569 | 578 | to remove prompts or otherwise alter the text. |
|
570 | 579 | """ |
|
571 | 580 | self._control.copy() |
|
572 | 581 | |
|
573 | 582 | def execute_file(self, path, hidden=False): |
|
574 | 583 | """ Attempts to execute file with 'path'. If 'hidden', no output is |
|
575 | 584 | shown. |
|
576 | 585 | """ |
|
577 | 586 | self.execute('execfile(%r)' % path, hidden=hidden) |
|
578 | 587 | |
|
579 | 588 | def interrupt_kernel(self): |
|
580 | 589 | """ Attempts to interrupt the running kernel. |
|
581 | 590 | |
|
582 | 591 | Also unsets _reading flag, to avoid runtime errors |
|
583 | 592 | if raw_input is called again. |
|
584 | 593 | """ |
|
585 | 594 | if self.custom_interrupt: |
|
586 | 595 | self._reading = False |
|
587 | 596 | self.custom_interrupt_requested.emit() |
|
588 | 597 | elif self.kernel_manager: |
|
589 | 598 | self._reading = False |
|
590 | 599 | self.kernel_manager.interrupt_kernel() |
|
591 | 600 | else: |
|
592 | 601 | self._append_plain_text('Cannot interrupt a kernel I did not start.\n') |
|
593 | 602 | |
|
594 | 603 | def reset(self, clear=False): |
|
595 | 604 | """ Resets the widget to its initial state if ``clear`` parameter |
|
596 | 605 | is True, otherwise |
|
597 | 606 | prints a visual indication of the fact that the kernel restarted, but |
|
598 | 607 | does not clear the traces from previous usage of the kernel before it |
|
599 | 608 | was restarted. With ``clear=True``, it is similar to ``%clear``, but |
|
600 | 609 | also re-writes the banner and aborts execution if necessary. |
|
601 | 610 | """ |
|
602 | 611 | if self._executing: |
|
603 | 612 | self._executing = False |
|
604 | 613 | self._request_info['execute'] = {} |
|
605 | 614 | self._reading = False |
|
606 | 615 | self._highlighter.highlighting_on = False |
|
607 | 616 | |
|
608 | 617 | if clear: |
|
609 | 618 | self._control.clear() |
|
610 | 619 | self._append_plain_text(self.banner) |
|
611 | 620 | # update output marker for stdout/stderr, so that startup |
|
612 | 621 | # messages appear after banner: |
|
613 | 622 | self._append_before_prompt_pos = self._get_cursor().position() |
|
614 | 623 | self._show_interpreter_prompt() |
|
615 | 624 | |
|
616 | 625 | def restart_kernel(self, message, now=False): |
|
617 | 626 | """ Attempts to restart the running kernel. |
|
618 | 627 | """ |
|
619 | 628 | # FIXME: now should be configurable via a checkbox in the dialog. Right |
|
620 | 629 | # now at least the heartbeat path sets it to True and the manual restart |
|
621 | 630 | # to False. But those should just be the pre-selected states of a |
|
622 | 631 | # checkbox that the user could override if so desired. But I don't know |
|
623 | 632 | # enough Qt to go implementing the checkbox now. |
|
624 | 633 | |
|
625 | 634 | if self.custom_restart: |
|
626 | 635 | self.custom_restart_requested.emit() |
|
627 | 636 | return |
|
628 | 637 | |
|
629 | 638 | if self.kernel_manager: |
|
630 | 639 | # Pause the heart beat channel to prevent further warnings. |
|
631 | 640 | self.kernel_client.hb_channel.pause() |
|
632 | 641 | |
|
633 | 642 | # Prompt the user to restart the kernel. Un-pause the heartbeat if |
|
634 | 643 | # they decline. (If they accept, the heartbeat will be un-paused |
|
635 | 644 | # automatically when the kernel is restarted.) |
|
636 | 645 | if self.confirm_restart: |
|
637 | 646 | buttons = QtGui.QMessageBox.Yes | QtGui.QMessageBox.No |
|
638 | 647 | result = QtGui.QMessageBox.question(self, 'Restart kernel?', |
|
639 | 648 | message, buttons) |
|
640 | 649 | do_restart = result == QtGui.QMessageBox.Yes |
|
641 | 650 | else: |
|
642 | 651 | # confirm_restart is False, so we don't need to ask user |
|
643 | 652 | # anything, just do the restart |
|
644 | 653 | do_restart = True |
|
645 | 654 | if do_restart: |
|
646 | 655 | try: |
|
647 | 656 | self.kernel_manager.restart_kernel(now=now) |
|
648 | 657 | except RuntimeError as e: |
|
649 | 658 | self._append_plain_text( |
|
650 | 659 | 'Error restarting kernel: %s\n' % e, |
|
651 | 660 | before_prompt=True |
|
652 | 661 | ) |
|
653 | 662 | else: |
|
654 | 663 | self._append_html("<br>Restarting kernel...\n<hr><br>", |
|
655 | 664 | before_prompt=True, |
|
656 | 665 | ) |
|
657 | 666 | else: |
|
658 | 667 | self.kernel_client.hb_channel.unpause() |
|
659 | 668 | |
|
660 | 669 | else: |
|
661 | 670 | self._append_plain_text( |
|
662 | 671 | 'Cannot restart a Kernel I did not start\n', |
|
663 | 672 | before_prompt=True |
|
664 | 673 | ) |
|
665 | 674 | |
|
666 | 675 | #--------------------------------------------------------------------------- |
|
667 | 676 | # 'FrontendWidget' protected interface |
|
668 | 677 | #--------------------------------------------------------------------------- |
|
669 | 678 | |
|
670 | 679 | def _call_tip(self): |
|
671 | 680 | """ Shows a call tip, if appropriate, at the current cursor location. |
|
672 | 681 | """ |
|
673 | 682 | # Decide if it makes sense to show a call tip |
|
674 | 683 | if not self.enable_calltips: |
|
675 | 684 | return False |
|
676 | 685 | cursor = self._get_cursor() |
|
677 | 686 | cursor.movePosition(QtGui.QTextCursor.Left) |
|
678 | 687 | if cursor.document().characterAt(cursor.position()) != '(': |
|
679 | 688 | return False |
|
680 | 689 | context = self._get_context(cursor) |
|
681 | 690 | if not context: |
|
682 | 691 | return False |
|
683 | 692 | |
|
684 | 693 | # Send the metadata request to the kernel |
|
685 | 694 | name = '.'.join(context) |
|
686 | 695 | msg_id = self.kernel_client.object_info(name) |
|
687 | 696 | pos = self._get_cursor().position() |
|
688 | 697 | self._request_info['call_tip'] = self._CallTipRequest(msg_id, pos) |
|
689 | 698 | return True |
|
690 | 699 | |
|
691 | 700 | def _complete(self): |
|
692 | 701 | """ Performs completion at the current cursor location. |
|
693 | 702 | """ |
|
694 | 703 | context = self._get_context() |
|
695 | 704 | if context: |
|
696 | 705 | # Send the completion request to the kernel |
|
697 | 706 | msg_id = self.kernel_client.complete( |
|
698 | 707 | '.'.join(context), # text |
|
699 | 708 | self._get_input_buffer_cursor_line(), # line |
|
700 | 709 | self._get_input_buffer_cursor_column(), # cursor_pos |
|
701 | 710 | self.input_buffer) # block |
|
702 | 711 | pos = self._get_cursor().position() |
|
703 | 712 | info = self._CompletionRequest(msg_id, pos) |
|
704 | 713 | self._request_info['complete'] = info |
|
705 | 714 | |
|
706 | 715 | def _get_context(self, cursor=None): |
|
707 | 716 | """ Gets the context for the specified cursor (or the current cursor |
|
708 | 717 | if none is specified). |
|
709 | 718 | """ |
|
710 | 719 | if cursor is None: |
|
711 | 720 | cursor = self._get_cursor() |
|
712 | 721 | cursor.movePosition(QtGui.QTextCursor.StartOfBlock, |
|
713 | 722 | QtGui.QTextCursor.KeepAnchor) |
|
714 | 723 | text = cursor.selection().toPlainText() |
|
715 | 724 | return self._completion_lexer.get_context(text) |
|
716 | 725 | |
|
717 | 726 | def _process_execute_abort(self, msg): |
|
718 | 727 | """ Process a reply for an aborted execution request. |
|
719 | 728 | """ |
|
720 | 729 | self._append_plain_text("ERROR: execution aborted\n") |
|
721 | 730 | |
|
722 | 731 | def _process_execute_error(self, msg): |
|
723 | 732 | """ Process a reply for an execution request that resulted in an error. |
|
724 | 733 | """ |
|
725 | 734 | content = msg['content'] |
|
726 | 735 | # If a SystemExit is passed along, this means exit() was called - also |
|
727 | 736 | # all the ipython %exit magic syntax of '-k' to be used to keep |
|
728 | 737 | # the kernel running |
|
729 | 738 | if content['ename']=='SystemExit': |
|
730 | 739 | keepkernel = content['evalue']=='-k' or content['evalue']=='True' |
|
731 | 740 | self._keep_kernel_on_exit = keepkernel |
|
732 | 741 | self.exit_requested.emit(self) |
|
733 | 742 | else: |
|
734 | 743 | traceback = ''.join(content['traceback']) |
|
735 | 744 | self._append_plain_text(traceback) |
|
736 | 745 | |
|
737 | 746 | def _process_execute_ok(self, msg): |
|
738 | 747 | """ Process a reply for a successful execution request. |
|
739 | 748 | """ |
|
740 | 749 | payload = msg['content']['payload'] |
|
741 | 750 | for item in payload: |
|
742 | 751 | if not self._process_execute_payload(item): |
|
743 | 752 | warning = 'Warning: received unknown payload of type %s' |
|
744 | 753 | print(warning % repr(item['source'])) |
|
745 | 754 | |
|
746 | 755 | def _process_execute_payload(self, item): |
|
747 | 756 | """ Process a single payload item from the list of payload items in an |
|
748 | 757 | execution reply. Returns whether the payload was handled. |
|
749 | 758 | """ |
|
750 | 759 | # The basic FrontendWidget doesn't handle payloads, as they are a |
|
751 | 760 | # mechanism for going beyond the standard Python interpreter model. |
|
752 | 761 | return False |
|
753 | 762 | |
|
754 | 763 | def _show_interpreter_prompt(self): |
|
755 | 764 | """ Shows a prompt for the interpreter. |
|
756 | 765 | """ |
|
757 | 766 | self._show_prompt('>>> ') |
|
758 | 767 | |
|
759 | 768 | def _show_interpreter_prompt_for_reply(self, msg): |
|
760 | 769 | """ Shows a prompt for the interpreter given an 'execute_reply' message. |
|
761 | 770 | """ |
|
762 | 771 | self._show_interpreter_prompt() |
|
763 | 772 | |
|
764 | 773 | #------ Signal handlers ---------------------------------------------------- |
|
765 | 774 | |
|
766 | 775 | def _document_contents_change(self, position, removed, added): |
|
767 | 776 | """ Called whenever the document's content changes. Display a call tip |
|
768 | 777 | if appropriate. |
|
769 | 778 | """ |
|
770 | 779 | # Calculate where the cursor should be *after* the change: |
|
771 | 780 | position += added |
|
772 | 781 | |
|
773 | 782 | document = self._control.document() |
|
774 | 783 | if position == self._get_cursor().position(): |
|
775 | 784 | self._call_tip() |
|
776 | 785 | |
|
777 | 786 | #------ Trait default initializers ----------------------------------------- |
|
778 | 787 | |
|
779 | 788 | def _banner_default(self): |
|
780 | 789 | """ Returns the standard Python banner. |
|
781 | 790 | """ |
|
782 | 791 | banner = 'Python %s on %s\nType "help", "copyright", "credits" or ' \ |
|
783 | 792 | '"license" for more information.' |
|
784 | 793 | return banner % (sys.version, sys.platform) |
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