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@@ -1,637 +1,636 b'' | |||||
1 | # -*- coding: utf-8 -*- |
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1 | # -*- coding: utf-8 -*- | |
2 | """Display formatters. |
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2 | """Display formatters. | |
3 |
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3 | |||
4 | Inheritance diagram: |
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4 | Inheritance diagram: | |
5 |
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5 | |||
6 | .. inheritance-diagram:: IPython.core.formatters |
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6 | .. inheritance-diagram:: IPython.core.formatters | |
7 | :parts: 3 |
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7 | :parts: 3 | |
8 |
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8 | |||
9 | Authors: |
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9 | Authors: | |
10 |
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10 | |||
11 | * Robert Kern |
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11 | * Robert Kern | |
12 | * Brian Granger |
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12 | * Brian Granger | |
13 | """ |
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13 | """ | |
14 | #----------------------------------------------------------------------------- |
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14 | #----------------------------------------------------------------------------- | |
15 | # Copyright (C) 2010-2011, IPython Development Team. |
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15 | # Copyright (C) 2010-2011, IPython Development Team. | |
16 | # |
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16 | # | |
17 | # Distributed under the terms of the Modified BSD License. |
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17 | # Distributed under the terms of the Modified BSD License. | |
18 | # |
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18 | # | |
19 | # The full license is in the file COPYING.txt, distributed with this software. |
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19 | # The full license is in the file COPYING.txt, distributed with this software. | |
20 | #----------------------------------------------------------------------------- |
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20 | #----------------------------------------------------------------------------- | |
21 |
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21 | |||
22 | #----------------------------------------------------------------------------- |
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22 | #----------------------------------------------------------------------------- | |
23 | # Imports |
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23 | # Imports | |
24 | #----------------------------------------------------------------------------- |
|
24 | #----------------------------------------------------------------------------- | |
25 |
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25 | |||
26 | # Stdlib imports |
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26 | # Stdlib imports | |
27 | import abc |
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27 | import abc | |
28 | import sys |
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28 | import sys | |
29 | import warnings |
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29 | import warnings | |
30 | # We must use StringIO, as cStringIO doesn't handle unicode properly. |
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30 | # We must use StringIO, as cStringIO doesn't handle unicode properly. | |
31 | from StringIO import StringIO |
|
31 | from StringIO import StringIO | |
32 |
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32 | |||
33 | # Our own imports |
|
33 | # Our own imports | |
34 | from IPython.config.configurable import Configurable |
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34 | from IPython.config.configurable import Configurable | |
35 | from IPython.lib import pretty |
|
35 | from IPython.lib import pretty | |
36 | from IPython.utils.traitlets import ( |
|
36 | from IPython.utils.traitlets import ( | |
37 | Bool, Dict, Integer, Unicode, CUnicode, ObjectName, List, |
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37 | Bool, Dict, Integer, Unicode, CUnicode, ObjectName, List, | |
38 | ) |
|
38 | ) | |
39 | from IPython.utils.py3compat import unicode_to_str |
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39 | from IPython.utils.py3compat import unicode_to_str | |
40 |
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40 | |||
41 |
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41 | |||
42 | #----------------------------------------------------------------------------- |
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42 | #----------------------------------------------------------------------------- | |
43 | # The main DisplayFormatter class |
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43 | # The main DisplayFormatter class | |
44 | #----------------------------------------------------------------------------- |
|
44 | #----------------------------------------------------------------------------- | |
45 |
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45 | |||
46 |
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46 | |||
47 | class DisplayFormatter(Configurable): |
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47 | class DisplayFormatter(Configurable): | |
48 |
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48 | |||
49 | # When set to true only the default plain text formatter will be used. |
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49 | # When set to true only the default plain text formatter will be used. | |
50 | plain_text_only = Bool(False, config=True) |
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50 | plain_text_only = Bool(False, config=True) | |
51 | def _plain_text_only_changed(self, name, old, new): |
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51 | def _plain_text_only_changed(self, name, old, new): | |
52 | warnings.warn("""DisplayFormatter.plain_text_only is deprecated. |
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52 | warnings.warn("""DisplayFormatter.plain_text_only is deprecated. | |
53 |
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53 | |||
54 | Use DisplayFormatter.active_types = ['text/plain'] |
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54 | Use DisplayFormatter.active_types = ['text/plain'] | |
55 | for the same effect. |
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55 | for the same effect. | |
56 | """, DeprecationWarning) |
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56 | """, DeprecationWarning) | |
57 | if new: |
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57 | if new: | |
58 | self.active_types = ['text/plain'] |
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58 | self.active_types = ['text/plain'] | |
59 | else: |
|
59 | else: | |
60 | self.active_types = self.format_types |
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60 | self.active_types = self.format_types | |
61 |
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61 | |||
62 | active_types = List(Unicode, config=True, |
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62 | active_types = List(Unicode, config=True, | |
63 | help="""List of currently active mime-types""") |
|
63 | help="""List of currently active mime-types""") | |
64 | def _active_types_default(self): |
|
64 | def _active_types_default(self): | |
65 | return self.format_types |
|
65 | return self.format_types | |
66 |
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66 | |||
67 | def _active_types_changed(self, name, old, new): |
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67 | def _active_types_changed(self, name, old, new): | |
68 | for key, formatter in self.formatters.keys(): |
|
68 | for key, formatter in self.formatters.keys(): | |
69 | if key in new: |
|
69 | if key in new: | |
70 | formatter.enabled = True |
|
70 | formatter.enabled = True | |
71 | else: |
|
71 | else: | |
72 | formatter.enabled = False |
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72 | formatter.enabled = False | |
73 |
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73 | |||
74 | # A dict of formatter whose keys are format types (MIME types) and whose |
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74 | # A dict of formatter whose keys are format types (MIME types) and whose | |
75 | # values are subclasses of BaseFormatter. |
|
75 | # values are subclasses of BaseFormatter. | |
76 | formatters = Dict() |
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76 | formatters = Dict() | |
77 | def _formatters_default(self): |
|
77 | def _formatters_default(self): | |
78 | """Activate the default formatters.""" |
|
78 | """Activate the default formatters.""" | |
79 | formatter_classes = [ |
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79 | formatter_classes = [ | |
80 | PlainTextFormatter, |
|
80 | PlainTextFormatter, | |
81 | HTMLFormatter, |
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81 | HTMLFormatter, | |
82 | SVGFormatter, |
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82 | SVGFormatter, | |
83 | PNGFormatter, |
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83 | PNGFormatter, | |
84 | JPEGFormatter, |
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84 | JPEGFormatter, | |
85 | LatexFormatter, |
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85 | LatexFormatter, | |
86 | JSONFormatter, |
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86 | JSONFormatter, | |
87 | JavascriptFormatter |
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87 | JavascriptFormatter | |
88 | ] |
|
88 | ] | |
89 | d = {} |
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89 | d = {} | |
90 | for cls in formatter_classes: |
|
90 | for cls in formatter_classes: | |
91 | f = cls(config=self.config) |
|
91 | f = cls(config=self.config) | |
92 | d[f.format_type] = f |
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92 | d[f.format_type] = f | |
93 | return d |
|
93 | return d | |
94 |
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94 | |||
95 | def format(self, obj, include=None, exclude=None): |
|
95 | def format(self, obj, include=None, exclude=None): | |
96 | """Return a format data dict for an object. |
|
96 | """Return a format data dict for an object. | |
97 |
|
97 | |||
98 | By default all format types will be computed. |
|
98 | By default all format types will be computed. | |
99 |
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99 | |||
100 | The following MIME types are currently implemented: |
|
100 | The following MIME types are currently implemented: | |
101 |
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101 | |||
102 | * text/plain |
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102 | * text/plain | |
103 | * text/html |
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103 | * text/html | |
104 | * text/latex |
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104 | * text/latex | |
105 | * application/json |
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105 | * application/json | |
106 | * application/javascript |
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106 | * application/javascript | |
107 | * image/png |
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107 | * image/png | |
108 | * image/jpeg |
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108 | * image/jpeg | |
109 | * image/svg+xml |
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109 | * image/svg+xml | |
110 |
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110 | |||
111 | Parameters |
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111 | Parameters | |
112 | ---------- |
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112 | ---------- | |
113 | obj : object |
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113 | obj : object | |
114 | The Python object whose format data will be computed. |
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114 | The Python object whose format data will be computed. | |
115 | include : list or tuple, optional |
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115 | include : list or tuple, optional | |
116 | A list of format type strings (MIME types) to include in the |
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116 | A list of format type strings (MIME types) to include in the | |
117 | format data dict. If this is set *only* the format types included |
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117 | format data dict. If this is set *only* the format types included | |
118 | in this list will be computed. |
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118 | in this list will be computed. | |
119 | exclude : list or tuple, optional |
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119 | exclude : list or tuple, optional | |
120 | A list of format type string (MIME types) to exclude in the format |
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120 | A list of format type string (MIME types) to exclude in the format | |
121 | data dict. If this is set all format types will be computed, |
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121 | data dict. If this is set all format types will be computed, | |
122 | except for those included in this argument. |
|
122 | except for those included in this argument. | |
123 |
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123 | |||
124 | Returns |
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124 | Returns | |
125 | ------- |
|
125 | ------- | |
126 | format_dict : dict |
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126 | format_dict : dict | |
127 | A dictionary of key/value pairs, one or each format that was |
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127 | A dictionary of key/value pairs, one or each format that was | |
128 | generated for the object. The keys are the format types, which |
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128 | generated for the object. The keys are the format types, which | |
129 | will usually be MIME type strings and the values and JSON'able |
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129 | will usually be MIME type strings and the values and JSON'able | |
130 | data structure containing the raw data for the representation in |
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130 | data structure containing the raw data for the representation in | |
131 | that format. |
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131 | that format. | |
132 | """ |
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132 | """ | |
133 | format_dict = {} |
|
133 | format_dict = {} | |
134 |
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134 | |||
135 | for format_type, formatter in self.formatters.items(): |
|
135 | for format_type, formatter in self.formatters.items(): | |
136 | if format_type not in include: |
|
136 | if include and format_type not in include: | |
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137 | continue | |||
|
138 | if exclude and format_type in exclude: | |||
137 | continue |
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139 | continue | |
138 | if exclude is not None: |
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|||
139 | if format_type in exclude: |
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|||
140 | continue |
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|||
141 | try: |
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140 | try: | |
142 | data = formatter(obj) |
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141 | data = formatter(obj) | |
143 | except: |
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142 | except: | |
144 | # FIXME: log the exception |
|
143 | # FIXME: log the exception | |
145 | raise |
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144 | raise | |
146 | if data is not None: |
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145 | if data is not None: | |
147 | format_dict[format_type] = data |
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146 | format_dict[format_type] = data | |
148 | return format_dict |
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147 | return format_dict | |
149 |
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148 | |||
150 | @property |
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149 | @property | |
151 | def format_types(self): |
|
150 | def format_types(self): | |
152 | """Return the format types (MIME types) of the active formatters.""" |
|
151 | """Return the format types (MIME types) of the active formatters.""" | |
153 | return self.formatters.keys() |
|
152 | return self.formatters.keys() | |
154 |
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153 | |||
155 |
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154 | |||
156 | #----------------------------------------------------------------------------- |
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155 | #----------------------------------------------------------------------------- | |
157 | # Formatters for specific format types (text, html, svg, etc.) |
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156 | # Formatters for specific format types (text, html, svg, etc.) | |
158 | #----------------------------------------------------------------------------- |
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157 | #----------------------------------------------------------------------------- | |
159 |
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158 | |||
160 |
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159 | |||
161 | class FormatterABC(object): |
|
160 | class FormatterABC(object): | |
162 | """ Abstract base class for Formatters. |
|
161 | """ Abstract base class for Formatters. | |
163 |
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162 | |||
164 | A formatter is a callable class that is responsible for computing the |
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163 | A formatter is a callable class that is responsible for computing the | |
165 | raw format data for a particular format type (MIME type). For example, |
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164 | raw format data for a particular format type (MIME type). For example, | |
166 | an HTML formatter would have a format type of `text/html` and would return |
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165 | an HTML formatter would have a format type of `text/html` and would return | |
167 | the HTML representation of the object when called. |
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166 | the HTML representation of the object when called. | |
168 | """ |
|
167 | """ | |
169 | __metaclass__ = abc.ABCMeta |
|
168 | __metaclass__ = abc.ABCMeta | |
170 |
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169 | |||
171 | # The format type of the data returned, usually a MIME type. |
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170 | # The format type of the data returned, usually a MIME type. | |
172 | format_type = 'text/plain' |
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171 | format_type = 'text/plain' | |
173 |
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172 | |||
174 | # Is the formatter enabled... |
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173 | # Is the formatter enabled... | |
175 | enabled = True |
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174 | enabled = True | |
176 |
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175 | |||
177 | @abc.abstractmethod |
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176 | @abc.abstractmethod | |
178 | def __call__(self, obj): |
|
177 | def __call__(self, obj): | |
179 | """Return a JSON'able representation of the object. |
|
178 | """Return a JSON'able representation of the object. | |
180 |
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179 | |||
181 | If the object cannot be formatted by this formatter, then return None |
|
180 | If the object cannot be formatted by this formatter, then return None | |
182 | """ |
|
181 | """ | |
183 | try: |
|
182 | try: | |
184 | return repr(obj) |
|
183 | return repr(obj) | |
185 | except TypeError: |
|
184 | except TypeError: | |
186 | return None |
|
185 | return None | |
187 |
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186 | |||
188 |
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187 | |||
189 | class BaseFormatter(Configurable): |
|
188 | class BaseFormatter(Configurable): | |
190 | """A base formatter class that is configurable. |
|
189 | """A base formatter class that is configurable. | |
191 |
|
190 | |||
192 | This formatter should usually be used as the base class of all formatters. |
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191 | This formatter should usually be used as the base class of all formatters. | |
193 | It is a traited :class:`Configurable` class and includes an extensible |
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192 | It is a traited :class:`Configurable` class and includes an extensible | |
194 | API for users to determine how their objects are formatted. The following |
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193 | API for users to determine how their objects are formatted. The following | |
195 | logic is used to find a function to format an given object. |
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194 | logic is used to find a function to format an given object. | |
196 |
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195 | |||
197 | 1. The object is introspected to see if it has a method with the name |
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196 | 1. The object is introspected to see if it has a method with the name | |
198 | :attr:`print_method`. If is does, that object is passed to that method |
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197 | :attr:`print_method`. If is does, that object is passed to that method | |
199 | for formatting. |
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198 | for formatting. | |
200 | 2. If no print method is found, three internal dictionaries are consulted |
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199 | 2. If no print method is found, three internal dictionaries are consulted | |
201 | to find print method: :attr:`singleton_printers`, :attr:`type_printers` |
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200 | to find print method: :attr:`singleton_printers`, :attr:`type_printers` | |
202 | and :attr:`deferred_printers`. |
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201 | and :attr:`deferred_printers`. | |
203 |
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202 | |||
204 | Users should use these dictionaries to register functions that will be |
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203 | Users should use these dictionaries to register functions that will be | |
205 | used to compute the format data for their objects (if those objects don't |
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204 | used to compute the format data for their objects (if those objects don't | |
206 | have the special print methods). The easiest way of using these |
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205 | have the special print methods). The easiest way of using these | |
207 | dictionaries is through the :meth:`for_type` and :meth:`for_type_by_name` |
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206 | dictionaries is through the :meth:`for_type` and :meth:`for_type_by_name` | |
208 | methods. |
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207 | methods. | |
209 |
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208 | |||
210 | If no function/callable is found to compute the format data, ``None`` is |
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209 | If no function/callable is found to compute the format data, ``None`` is | |
211 | returned and this format type is not used. |
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210 | returned and this format type is not used. | |
212 | """ |
|
211 | """ | |
213 |
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212 | |||
214 | format_type = Unicode('text/plain') |
|
213 | format_type = Unicode('text/plain') | |
215 |
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214 | |||
216 | enabled = Bool(True, config=True) |
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215 | enabled = Bool(True, config=True) | |
217 |
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216 | |||
218 | print_method = ObjectName('__repr__') |
|
217 | print_method = ObjectName('__repr__') | |
219 |
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218 | |||
220 | # The singleton printers. |
|
219 | # The singleton printers. | |
221 | # Maps the IDs of the builtin singleton objects to the format functions. |
|
220 | # Maps the IDs of the builtin singleton objects to the format functions. | |
222 | singleton_printers = Dict(config=True) |
|
221 | singleton_printers = Dict(config=True) | |
223 | def _singleton_printers_default(self): |
|
222 | def _singleton_printers_default(self): | |
224 | return {} |
|
223 | return {} | |
225 |
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224 | |||
226 | # The type-specific printers. |
|
225 | # The type-specific printers. | |
227 | # Map type objects to the format functions. |
|
226 | # Map type objects to the format functions. | |
228 | type_printers = Dict(config=True) |
|
227 | type_printers = Dict(config=True) | |
229 | def _type_printers_default(self): |
|
228 | def _type_printers_default(self): | |
230 | return {} |
|
229 | return {} | |
231 |
|
230 | |||
232 | # The deferred-import type-specific printers. |
|
231 | # The deferred-import type-specific printers. | |
233 | # Map (modulename, classname) pairs to the format functions. |
|
232 | # Map (modulename, classname) pairs to the format functions. | |
234 | deferred_printers = Dict(config=True) |
|
233 | deferred_printers = Dict(config=True) | |
235 | def _deferred_printers_default(self): |
|
234 | def _deferred_printers_default(self): | |
236 | return {} |
|
235 | return {} | |
237 |
|
236 | |||
238 | def __call__(self, obj): |
|
237 | def __call__(self, obj): | |
239 | """Compute the format for an object.""" |
|
238 | """Compute the format for an object.""" | |
240 | if self.enabled: |
|
239 | if self.enabled: | |
241 | obj_id = id(obj) |
|
240 | obj_id = id(obj) | |
242 | try: |
|
241 | try: | |
243 | obj_class = getattr(obj, '__class__', None) or type(obj) |
|
242 | obj_class = getattr(obj, '__class__', None) or type(obj) | |
244 | # First try to find registered singleton printers for the type. |
|
243 | # First try to find registered singleton printers for the type. | |
245 | try: |
|
244 | try: | |
246 | printer = self.singleton_printers[obj_id] |
|
245 | printer = self.singleton_printers[obj_id] | |
247 | except (TypeError, KeyError): |
|
246 | except (TypeError, KeyError): | |
248 | pass |
|
247 | pass | |
249 | else: |
|
248 | else: | |
250 | return printer(obj) |
|
249 | return printer(obj) | |
251 | # Next look for type_printers. |
|
250 | # Next look for type_printers. | |
252 | for cls in pretty._get_mro(obj_class): |
|
251 | for cls in pretty._get_mro(obj_class): | |
253 | if cls in self.type_printers: |
|
252 | if cls in self.type_printers: | |
254 | return self.type_printers[cls](obj) |
|
253 | return self.type_printers[cls](obj) | |
255 | else: |
|
254 | else: | |
256 | printer = self._in_deferred_types(cls) |
|
255 | printer = self._in_deferred_types(cls) | |
257 | if printer is not None: |
|
256 | if printer is not None: | |
258 | return printer(obj) |
|
257 | return printer(obj) | |
259 | # Finally look for special method names. |
|
258 | # Finally look for special method names. | |
260 | if hasattr(obj_class, self.print_method): |
|
259 | if hasattr(obj_class, self.print_method): | |
261 | printer = getattr(obj_class, self.print_method) |
|
260 | printer = getattr(obj_class, self.print_method) | |
262 | return printer(obj) |
|
261 | return printer(obj) | |
263 | return None |
|
262 | return None | |
264 | except Exception: |
|
263 | except Exception: | |
265 | pass |
|
264 | pass | |
266 | else: |
|
265 | else: | |
267 | return None |
|
266 | return None | |
268 |
|
267 | |||
269 | def for_type(self, typ, func): |
|
268 | def for_type(self, typ, func): | |
270 | """Add a format function for a given type. |
|
269 | """Add a format function for a given type. | |
271 |
|
270 | |||
272 | Parameters |
|
271 | Parameters | |
273 | ----------- |
|
272 | ----------- | |
274 | typ : class |
|
273 | typ : class | |
275 | The class of the object that will be formatted using `func`. |
|
274 | The class of the object that will be formatted using `func`. | |
276 | func : callable |
|
275 | func : callable | |
277 | The callable that will be called to compute the format data. The |
|
276 | The callable that will be called to compute the format data. The | |
278 | call signature of this function is simple, it must take the |
|
277 | call signature of this function is simple, it must take the | |
279 | object to be formatted and return the raw data for the given |
|
278 | object to be formatted and return the raw data for the given | |
280 | format. Subclasses may use a different call signature for the |
|
279 | format. Subclasses may use a different call signature for the | |
281 | `func` argument. |
|
280 | `func` argument. | |
282 | """ |
|
281 | """ | |
283 | oldfunc = self.type_printers.get(typ, None) |
|
282 | oldfunc = self.type_printers.get(typ, None) | |
284 | if func is not None: |
|
283 | if func is not None: | |
285 | # To support easy restoration of old printers, we need to ignore |
|
284 | # To support easy restoration of old printers, we need to ignore | |
286 | # Nones. |
|
285 | # Nones. | |
287 | self.type_printers[typ] = func |
|
286 | self.type_printers[typ] = func | |
288 | return oldfunc |
|
287 | return oldfunc | |
289 |
|
288 | |||
290 | def for_type_by_name(self, type_module, type_name, func): |
|
289 | def for_type_by_name(self, type_module, type_name, func): | |
291 | """Add a format function for a type specified by the full dotted |
|
290 | """Add a format function for a type specified by the full dotted | |
292 | module and name of the type, rather than the type of the object. |
|
291 | module and name of the type, rather than the type of the object. | |
293 |
|
292 | |||
294 | Parameters |
|
293 | Parameters | |
295 | ---------- |
|
294 | ---------- | |
296 | type_module : str |
|
295 | type_module : str | |
297 | The full dotted name of the module the type is defined in, like |
|
296 | The full dotted name of the module the type is defined in, like | |
298 | ``numpy``. |
|
297 | ``numpy``. | |
299 | type_name : str |
|
298 | type_name : str | |
300 | The name of the type (the class name), like ``dtype`` |
|
299 | The name of the type (the class name), like ``dtype`` | |
301 | func : callable |
|
300 | func : callable | |
302 | The callable that will be called to compute the format data. The |
|
301 | The callable that will be called to compute the format data. The | |
303 | call signature of this function is simple, it must take the |
|
302 | call signature of this function is simple, it must take the | |
304 | object to be formatted and return the raw data for the given |
|
303 | object to be formatted and return the raw data for the given | |
305 | format. Subclasses may use a different call signature for the |
|
304 | format. Subclasses may use a different call signature for the | |
306 | `func` argument. |
|
305 | `func` argument. | |
307 | """ |
|
306 | """ | |
308 | key = (type_module, type_name) |
|
307 | key = (type_module, type_name) | |
309 | oldfunc = self.deferred_printers.get(key, None) |
|
308 | oldfunc = self.deferred_printers.get(key, None) | |
310 | if func is not None: |
|
309 | if func is not None: | |
311 | # To support easy restoration of old printers, we need to ignore |
|
310 | # To support easy restoration of old printers, we need to ignore | |
312 | # Nones. |
|
311 | # Nones. | |
313 | self.deferred_printers[key] = func |
|
312 | self.deferred_printers[key] = func | |
314 | return oldfunc |
|
313 | return oldfunc | |
315 |
|
314 | |||
316 | def _in_deferred_types(self, cls): |
|
315 | def _in_deferred_types(self, cls): | |
317 | """ |
|
316 | """ | |
318 | Check if the given class is specified in the deferred type registry. |
|
317 | Check if the given class is specified in the deferred type registry. | |
319 |
|
318 | |||
320 | Returns the printer from the registry if it exists, and None if the |
|
319 | Returns the printer from the registry if it exists, and None if the | |
321 | class is not in the registry. Successful matches will be moved to the |
|
320 | class is not in the registry. Successful matches will be moved to the | |
322 | regular type registry for future use. |
|
321 | regular type registry for future use. | |
323 | """ |
|
322 | """ | |
324 | mod = getattr(cls, '__module__', None) |
|
323 | mod = getattr(cls, '__module__', None) | |
325 | name = getattr(cls, '__name__', None) |
|
324 | name = getattr(cls, '__name__', None) | |
326 | key = (mod, name) |
|
325 | key = (mod, name) | |
327 | printer = None |
|
326 | printer = None | |
328 | if key in self.deferred_printers: |
|
327 | if key in self.deferred_printers: | |
329 | # Move the printer over to the regular registry. |
|
328 | # Move the printer over to the regular registry. | |
330 | printer = self.deferred_printers.pop(key) |
|
329 | printer = self.deferred_printers.pop(key) | |
331 | self.type_printers[cls] = printer |
|
330 | self.type_printers[cls] = printer | |
332 | return printer |
|
331 | return printer | |
333 |
|
332 | |||
334 |
|
333 | |||
335 | class PlainTextFormatter(BaseFormatter): |
|
334 | class PlainTextFormatter(BaseFormatter): | |
336 | """The default pretty-printer. |
|
335 | """The default pretty-printer. | |
337 |
|
336 | |||
338 | This uses :mod:`IPython.lib.pretty` to compute the format data of |
|
337 | This uses :mod:`IPython.lib.pretty` to compute the format data of | |
339 | the object. If the object cannot be pretty printed, :func:`repr` is used. |
|
338 | the object. If the object cannot be pretty printed, :func:`repr` is used. | |
340 | See the documentation of :mod:`IPython.lib.pretty` for details on |
|
339 | See the documentation of :mod:`IPython.lib.pretty` for details on | |
341 | how to write pretty printers. Here is a simple example:: |
|
340 | how to write pretty printers. Here is a simple example:: | |
342 |
|
341 | |||
343 | def dtype_pprinter(obj, p, cycle): |
|
342 | def dtype_pprinter(obj, p, cycle): | |
344 | if cycle: |
|
343 | if cycle: | |
345 | return p.text('dtype(...)') |
|
344 | return p.text('dtype(...)') | |
346 | if hasattr(obj, 'fields'): |
|
345 | if hasattr(obj, 'fields'): | |
347 | if obj.fields is None: |
|
346 | if obj.fields is None: | |
348 | p.text(repr(obj)) |
|
347 | p.text(repr(obj)) | |
349 | else: |
|
348 | else: | |
350 | p.begin_group(7, 'dtype([') |
|
349 | p.begin_group(7, 'dtype([') | |
351 | for i, field in enumerate(obj.descr): |
|
350 | for i, field in enumerate(obj.descr): | |
352 | if i > 0: |
|
351 | if i > 0: | |
353 | p.text(',') |
|
352 | p.text(',') | |
354 | p.breakable() |
|
353 | p.breakable() | |
355 | p.pretty(field) |
|
354 | p.pretty(field) | |
356 | p.end_group(7, '])') |
|
355 | p.end_group(7, '])') | |
357 | """ |
|
356 | """ | |
358 |
|
357 | |||
359 | # The format type of data returned. |
|
358 | # The format type of data returned. | |
360 | format_type = Unicode('text/plain') |
|
359 | format_type = Unicode('text/plain') | |
361 |
|
360 | |||
362 | # This subclass ignores this attribute as it always need to return |
|
361 | # This subclass ignores this attribute as it always need to return | |
363 | # something. |
|
362 | # something. | |
364 | enabled = Bool(True, config=False) |
|
363 | enabled = Bool(True, config=False) | |
365 |
|
364 | |||
366 | # Look for a _repr_pretty_ methods to use for pretty printing. |
|
365 | # Look for a _repr_pretty_ methods to use for pretty printing. | |
367 | print_method = ObjectName('_repr_pretty_') |
|
366 | print_method = ObjectName('_repr_pretty_') | |
368 |
|
367 | |||
369 | # Whether to pretty-print or not. |
|
368 | # Whether to pretty-print or not. | |
370 | pprint = Bool(True, config=True) |
|
369 | pprint = Bool(True, config=True) | |
371 |
|
370 | |||
372 | # Whether to be verbose or not. |
|
371 | # Whether to be verbose or not. | |
373 | verbose = Bool(False, config=True) |
|
372 | verbose = Bool(False, config=True) | |
374 |
|
373 | |||
375 | # The maximum width. |
|
374 | # The maximum width. | |
376 | max_width = Integer(79, config=True) |
|
375 | max_width = Integer(79, config=True) | |
377 |
|
376 | |||
378 | # The newline character. |
|
377 | # The newline character. | |
379 | newline = Unicode('\n', config=True) |
|
378 | newline = Unicode('\n', config=True) | |
380 |
|
379 | |||
381 | # format-string for pprinting floats |
|
380 | # format-string for pprinting floats | |
382 | float_format = Unicode('%r') |
|
381 | float_format = Unicode('%r') | |
383 | # setter for float precision, either int or direct format-string |
|
382 | # setter for float precision, either int or direct format-string | |
384 | float_precision = CUnicode('', config=True) |
|
383 | float_precision = CUnicode('', config=True) | |
385 |
|
384 | |||
386 | def _float_precision_changed(self, name, old, new): |
|
385 | def _float_precision_changed(self, name, old, new): | |
387 | """float_precision changed, set float_format accordingly. |
|
386 | """float_precision changed, set float_format accordingly. | |
388 |
|
387 | |||
389 | float_precision can be set by int or str. |
|
388 | float_precision can be set by int or str. | |
390 | This will set float_format, after interpreting input. |
|
389 | This will set float_format, after interpreting input. | |
391 | If numpy has been imported, numpy print precision will also be set. |
|
390 | If numpy has been imported, numpy print precision will also be set. | |
392 |
|
391 | |||
393 | integer `n` sets format to '%.nf', otherwise, format set directly. |
|
392 | integer `n` sets format to '%.nf', otherwise, format set directly. | |
394 |
|
393 | |||
395 | An empty string returns to defaults (repr for float, 8 for numpy). |
|
394 | An empty string returns to defaults (repr for float, 8 for numpy). | |
396 |
|
395 | |||
397 | This parameter can be set via the '%precision' magic. |
|
396 | This parameter can be set via the '%precision' magic. | |
398 | """ |
|
397 | """ | |
399 |
|
398 | |||
400 | if '%' in new: |
|
399 | if '%' in new: | |
401 | # got explicit format string |
|
400 | # got explicit format string | |
402 | fmt = new |
|
401 | fmt = new | |
403 | try: |
|
402 | try: | |
404 | fmt%3.14159 |
|
403 | fmt%3.14159 | |
405 | except Exception: |
|
404 | except Exception: | |
406 | raise ValueError("Precision must be int or format string, not %r"%new) |
|
405 | raise ValueError("Precision must be int or format string, not %r"%new) | |
407 | elif new: |
|
406 | elif new: | |
408 | # otherwise, should be an int |
|
407 | # otherwise, should be an int | |
409 | try: |
|
408 | try: | |
410 | i = int(new) |
|
409 | i = int(new) | |
411 | assert i >= 0 |
|
410 | assert i >= 0 | |
412 | except ValueError: |
|
411 | except ValueError: | |
413 | raise ValueError("Precision must be int or format string, not %r"%new) |
|
412 | raise ValueError("Precision must be int or format string, not %r"%new) | |
414 | except AssertionError: |
|
413 | except AssertionError: | |
415 | raise ValueError("int precision must be non-negative, not %r"%i) |
|
414 | raise ValueError("int precision must be non-negative, not %r"%i) | |
416 |
|
415 | |||
417 | fmt = '%%.%if'%i |
|
416 | fmt = '%%.%if'%i | |
418 | if 'numpy' in sys.modules: |
|
417 | if 'numpy' in sys.modules: | |
419 | # set numpy precision if it has been imported |
|
418 | # set numpy precision if it has been imported | |
420 | import numpy |
|
419 | import numpy | |
421 | numpy.set_printoptions(precision=i) |
|
420 | numpy.set_printoptions(precision=i) | |
422 | else: |
|
421 | else: | |
423 | # default back to repr |
|
422 | # default back to repr | |
424 | fmt = '%r' |
|
423 | fmt = '%r' | |
425 | if 'numpy' in sys.modules: |
|
424 | if 'numpy' in sys.modules: | |
426 | import numpy |
|
425 | import numpy | |
427 | # numpy default is 8 |
|
426 | # numpy default is 8 | |
428 | numpy.set_printoptions(precision=8) |
|
427 | numpy.set_printoptions(precision=8) | |
429 | self.float_format = fmt |
|
428 | self.float_format = fmt | |
430 |
|
429 | |||
431 | # Use the default pretty printers from IPython.lib.pretty. |
|
430 | # Use the default pretty printers from IPython.lib.pretty. | |
432 | def _singleton_printers_default(self): |
|
431 | def _singleton_printers_default(self): | |
433 | return pretty._singleton_pprinters.copy() |
|
432 | return pretty._singleton_pprinters.copy() | |
434 |
|
433 | |||
435 | def _type_printers_default(self): |
|
434 | def _type_printers_default(self): | |
436 | d = pretty._type_pprinters.copy() |
|
435 | d = pretty._type_pprinters.copy() | |
437 | d[float] = lambda obj,p,cycle: p.text(self.float_format%obj) |
|
436 | d[float] = lambda obj,p,cycle: p.text(self.float_format%obj) | |
438 | return d |
|
437 | return d | |
439 |
|
438 | |||
440 | def _deferred_printers_default(self): |
|
439 | def _deferred_printers_default(self): | |
441 | return pretty._deferred_type_pprinters.copy() |
|
440 | return pretty._deferred_type_pprinters.copy() | |
442 |
|
441 | |||
443 | #### FormatterABC interface #### |
|
442 | #### FormatterABC interface #### | |
444 |
|
443 | |||
445 | def __call__(self, obj): |
|
444 | def __call__(self, obj): | |
446 | """Compute the pretty representation of the object.""" |
|
445 | """Compute the pretty representation of the object.""" | |
447 | if not self.pprint: |
|
446 | if not self.pprint: | |
448 | try: |
|
447 | try: | |
449 | return repr(obj) |
|
448 | return repr(obj) | |
450 | except TypeError: |
|
449 | except TypeError: | |
451 | return '' |
|
450 | return '' | |
452 | else: |
|
451 | else: | |
453 | # This uses use StringIO, as cStringIO doesn't handle unicode. |
|
452 | # This uses use StringIO, as cStringIO doesn't handle unicode. | |
454 | stream = StringIO() |
|
453 | stream = StringIO() | |
455 | # self.newline.encode() is a quick fix for issue gh-597. We need to |
|
454 | # self.newline.encode() is a quick fix for issue gh-597. We need to | |
456 | # ensure that stream does not get a mix of unicode and bytestrings, |
|
455 | # ensure that stream does not get a mix of unicode and bytestrings, | |
457 | # or it will cause trouble. |
|
456 | # or it will cause trouble. | |
458 | printer = pretty.RepresentationPrinter(stream, self.verbose, |
|
457 | printer = pretty.RepresentationPrinter(stream, self.verbose, | |
459 | self.max_width, unicode_to_str(self.newline), |
|
458 | self.max_width, unicode_to_str(self.newline), | |
460 | singleton_pprinters=self.singleton_printers, |
|
459 | singleton_pprinters=self.singleton_printers, | |
461 | type_pprinters=self.type_printers, |
|
460 | type_pprinters=self.type_printers, | |
462 | deferred_pprinters=self.deferred_printers) |
|
461 | deferred_pprinters=self.deferred_printers) | |
463 | printer.pretty(obj) |
|
462 | printer.pretty(obj) | |
464 | printer.flush() |
|
463 | printer.flush() | |
465 | return stream.getvalue() |
|
464 | return stream.getvalue() | |
466 |
|
465 | |||
467 |
|
466 | |||
468 | class HTMLFormatter(BaseFormatter): |
|
467 | class HTMLFormatter(BaseFormatter): | |
469 | """An HTML formatter. |
|
468 | """An HTML formatter. | |
470 |
|
469 | |||
471 | To define the callables that compute the HTML representation of your |
|
470 | To define the callables that compute the HTML representation of your | |
472 | objects, define a :meth:`_repr_html_` method or use the :meth:`for_type` |
|
471 | objects, define a :meth:`_repr_html_` method or use the :meth:`for_type` | |
473 | or :meth:`for_type_by_name` methods to register functions that handle |
|
472 | or :meth:`for_type_by_name` methods to register functions that handle | |
474 | this. |
|
473 | this. | |
475 |
|
474 | |||
476 | The return value of this formatter should be a valid HTML snippet that |
|
475 | The return value of this formatter should be a valid HTML snippet that | |
477 | could be injected into an existing DOM. It should *not* include the |
|
476 | could be injected into an existing DOM. It should *not* include the | |
478 | ```<html>`` or ```<body>`` tags. |
|
477 | ```<html>`` or ```<body>`` tags. | |
479 | """ |
|
478 | """ | |
480 | format_type = Unicode('text/html') |
|
479 | format_type = Unicode('text/html') | |
481 |
|
480 | |||
482 | print_method = ObjectName('_repr_html_') |
|
481 | print_method = ObjectName('_repr_html_') | |
483 |
|
482 | |||
484 |
|
483 | |||
485 | class SVGFormatter(BaseFormatter): |
|
484 | class SVGFormatter(BaseFormatter): | |
486 | """An SVG formatter. |
|
485 | """An SVG formatter. | |
487 |
|
486 | |||
488 | To define the callables that compute the SVG representation of your |
|
487 | To define the callables that compute the SVG representation of your | |
489 | objects, define a :meth:`_repr_svg_` method or use the :meth:`for_type` |
|
488 | objects, define a :meth:`_repr_svg_` method or use the :meth:`for_type` | |
490 | or :meth:`for_type_by_name` methods to register functions that handle |
|
489 | or :meth:`for_type_by_name` methods to register functions that handle | |
491 | this. |
|
490 | this. | |
492 |
|
491 | |||
493 | The return value of this formatter should be valid SVG enclosed in |
|
492 | The return value of this formatter should be valid SVG enclosed in | |
494 | ```<svg>``` tags, that could be injected into an existing DOM. It should |
|
493 | ```<svg>``` tags, that could be injected into an existing DOM. It should | |
495 | *not* include the ```<html>`` or ```<body>`` tags. |
|
494 | *not* include the ```<html>`` or ```<body>`` tags. | |
496 | """ |
|
495 | """ | |
497 | format_type = Unicode('image/svg+xml') |
|
496 | format_type = Unicode('image/svg+xml') | |
498 |
|
497 | |||
499 | print_method = ObjectName('_repr_svg_') |
|
498 | print_method = ObjectName('_repr_svg_') | |
500 |
|
499 | |||
501 |
|
500 | |||
502 | class PNGFormatter(BaseFormatter): |
|
501 | class PNGFormatter(BaseFormatter): | |
503 | """A PNG formatter. |
|
502 | """A PNG formatter. | |
504 |
|
503 | |||
505 | To define the callables that compute the PNG representation of your |
|
504 | To define the callables that compute the PNG representation of your | |
506 | objects, define a :meth:`_repr_png_` method or use the :meth:`for_type` |
|
505 | objects, define a :meth:`_repr_png_` method or use the :meth:`for_type` | |
507 | or :meth:`for_type_by_name` methods to register functions that handle |
|
506 | or :meth:`for_type_by_name` methods to register functions that handle | |
508 | this. |
|
507 | this. | |
509 |
|
508 | |||
510 | The return value of this formatter should be raw PNG data, *not* |
|
509 | The return value of this formatter should be raw PNG data, *not* | |
511 | base64 encoded. |
|
510 | base64 encoded. | |
512 | """ |
|
511 | """ | |
513 | format_type = Unicode('image/png') |
|
512 | format_type = Unicode('image/png') | |
514 |
|
513 | |||
515 | print_method = ObjectName('_repr_png_') |
|
514 | print_method = ObjectName('_repr_png_') | |
516 |
|
515 | |||
517 |
|
516 | |||
518 | class JPEGFormatter(BaseFormatter): |
|
517 | class JPEGFormatter(BaseFormatter): | |
519 | """A JPEG formatter. |
|
518 | """A JPEG formatter. | |
520 |
|
519 | |||
521 | To define the callables that compute the JPEG representation of your |
|
520 | To define the callables that compute the JPEG representation of your | |
522 | objects, define a :meth:`_repr_jpeg_` method or use the :meth:`for_type` |
|
521 | objects, define a :meth:`_repr_jpeg_` method or use the :meth:`for_type` | |
523 | or :meth:`for_type_by_name` methods to register functions that handle |
|
522 | or :meth:`for_type_by_name` methods to register functions that handle | |
524 | this. |
|
523 | this. | |
525 |
|
524 | |||
526 | The return value of this formatter should be raw JPEG data, *not* |
|
525 | The return value of this formatter should be raw JPEG data, *not* | |
527 | base64 encoded. |
|
526 | base64 encoded. | |
528 | """ |
|
527 | """ | |
529 | format_type = Unicode('image/jpeg') |
|
528 | format_type = Unicode('image/jpeg') | |
530 |
|
529 | |||
531 | print_method = ObjectName('_repr_jpeg_') |
|
530 | print_method = ObjectName('_repr_jpeg_') | |
532 |
|
531 | |||
533 |
|
532 | |||
534 | class LatexFormatter(BaseFormatter): |
|
533 | class LatexFormatter(BaseFormatter): | |
535 | """A LaTeX formatter. |
|
534 | """A LaTeX formatter. | |
536 |
|
535 | |||
537 | To define the callables that compute the LaTeX representation of your |
|
536 | To define the callables that compute the LaTeX representation of your | |
538 | objects, define a :meth:`_repr_latex_` method or use the :meth:`for_type` |
|
537 | objects, define a :meth:`_repr_latex_` method or use the :meth:`for_type` | |
539 | or :meth:`for_type_by_name` methods to register functions that handle |
|
538 | or :meth:`for_type_by_name` methods to register functions that handle | |
540 | this. |
|
539 | this. | |
541 |
|
540 | |||
542 | The return value of this formatter should be a valid LaTeX equation, |
|
541 | The return value of this formatter should be a valid LaTeX equation, | |
543 | enclosed in either ```$```, ```$$``` or another LaTeX equation |
|
542 | enclosed in either ```$```, ```$$``` or another LaTeX equation | |
544 | environment. |
|
543 | environment. | |
545 | """ |
|
544 | """ | |
546 | format_type = Unicode('text/latex') |
|
545 | format_type = Unicode('text/latex') | |
547 |
|
546 | |||
548 | print_method = ObjectName('_repr_latex_') |
|
547 | print_method = ObjectName('_repr_latex_') | |
549 |
|
548 | |||
550 |
|
549 | |||
551 | class JSONFormatter(BaseFormatter): |
|
550 | class JSONFormatter(BaseFormatter): | |
552 | """A JSON string formatter. |
|
551 | """A JSON string formatter. | |
553 |
|
552 | |||
554 | To define the callables that compute the JSON string representation of |
|
553 | To define the callables that compute the JSON string representation of | |
555 | your objects, define a :meth:`_repr_json_` method or use the :meth:`for_type` |
|
554 | your objects, define a :meth:`_repr_json_` method or use the :meth:`for_type` | |
556 | or :meth:`for_type_by_name` methods to register functions that handle |
|
555 | or :meth:`for_type_by_name` methods to register functions that handle | |
557 | this. |
|
556 | this. | |
558 |
|
557 | |||
559 | The return value of this formatter should be a valid JSON string. |
|
558 | The return value of this formatter should be a valid JSON string. | |
560 | """ |
|
559 | """ | |
561 | format_type = Unicode('application/json') |
|
560 | format_type = Unicode('application/json') | |
562 |
|
561 | |||
563 | print_method = ObjectName('_repr_json_') |
|
562 | print_method = ObjectName('_repr_json_') | |
564 |
|
563 | |||
565 |
|
564 | |||
566 | class JavascriptFormatter(BaseFormatter): |
|
565 | class JavascriptFormatter(BaseFormatter): | |
567 | """A Javascript formatter. |
|
566 | """A Javascript formatter. | |
568 |
|
567 | |||
569 | To define the callables that compute the Javascript representation of |
|
568 | To define the callables that compute the Javascript representation of | |
570 | your objects, define a :meth:`_repr_javascript_` method or use the |
|
569 | your objects, define a :meth:`_repr_javascript_` method or use the | |
571 | :meth:`for_type` or :meth:`for_type_by_name` methods to register functions |
|
570 | :meth:`for_type` or :meth:`for_type_by_name` methods to register functions | |
572 | that handle this. |
|
571 | that handle this. | |
573 |
|
572 | |||
574 | The return value of this formatter should be valid Javascript code and |
|
573 | The return value of this formatter should be valid Javascript code and | |
575 | should *not* be enclosed in ```<script>``` tags. |
|
574 | should *not* be enclosed in ```<script>``` tags. | |
576 | """ |
|
575 | """ | |
577 | format_type = Unicode('application/javascript') |
|
576 | format_type = Unicode('application/javascript') | |
578 |
|
577 | |||
579 | print_method = ObjectName('_repr_javascript_') |
|
578 | print_method = ObjectName('_repr_javascript_') | |
580 |
|
579 | |||
581 | FormatterABC.register(BaseFormatter) |
|
580 | FormatterABC.register(BaseFormatter) | |
582 | FormatterABC.register(PlainTextFormatter) |
|
581 | FormatterABC.register(PlainTextFormatter) | |
583 | FormatterABC.register(HTMLFormatter) |
|
582 | FormatterABC.register(HTMLFormatter) | |
584 | FormatterABC.register(SVGFormatter) |
|
583 | FormatterABC.register(SVGFormatter) | |
585 | FormatterABC.register(PNGFormatter) |
|
584 | FormatterABC.register(PNGFormatter) | |
586 | FormatterABC.register(JPEGFormatter) |
|
585 | FormatterABC.register(JPEGFormatter) | |
587 | FormatterABC.register(LatexFormatter) |
|
586 | FormatterABC.register(LatexFormatter) | |
588 | FormatterABC.register(JSONFormatter) |
|
587 | FormatterABC.register(JSONFormatter) | |
589 | FormatterABC.register(JavascriptFormatter) |
|
588 | FormatterABC.register(JavascriptFormatter) | |
590 |
|
589 | |||
591 |
|
590 | |||
592 | def format_display_data(obj, include=None, exclude=None): |
|
591 | def format_display_data(obj, include=None, exclude=None): | |
593 | """Return a format data dict for an object. |
|
592 | """Return a format data dict for an object. | |
594 |
|
593 | |||
595 | By default all format types will be computed. |
|
594 | By default all format types will be computed. | |
596 |
|
595 | |||
597 | The following MIME types are currently implemented: |
|
596 | The following MIME types are currently implemented: | |
598 |
|
597 | |||
599 | * text/plain |
|
598 | * text/plain | |
600 | * text/html |
|
599 | * text/html | |
601 | * text/latex |
|
600 | * text/latex | |
602 | * application/json |
|
601 | * application/json | |
603 | * application/javascript |
|
602 | * application/javascript | |
604 | * image/png |
|
603 | * image/png | |
605 | * image/jpeg |
|
604 | * image/jpeg | |
606 | * image/svg+xml |
|
605 | * image/svg+xml | |
607 |
|
606 | |||
608 | Parameters |
|
607 | Parameters | |
609 | ---------- |
|
608 | ---------- | |
610 | obj : object |
|
609 | obj : object | |
611 | The Python object whose format data will be computed. |
|
610 | The Python object whose format data will be computed. | |
612 |
|
611 | |||
613 | Returns |
|
612 | Returns | |
614 | ------- |
|
613 | ------- | |
615 | format_dict : dict |
|
614 | format_dict : dict | |
616 | A dictionary of key/value pairs, one or each format that was |
|
615 | A dictionary of key/value pairs, one or each format that was | |
617 | generated for the object. The keys are the format types, which |
|
616 | generated for the object. The keys are the format types, which | |
618 | will usually be MIME type strings and the values and JSON'able |
|
617 | will usually be MIME type strings and the values and JSON'able | |
619 | data structure containing the raw data for the representation in |
|
618 | data structure containing the raw data for the representation in | |
620 | that format. |
|
619 | that format. | |
621 | include : list or tuple, optional |
|
620 | include : list or tuple, optional | |
622 | A list of format type strings (MIME types) to include in the |
|
621 | A list of format type strings (MIME types) to include in the | |
623 | format data dict. If this is set *only* the format types included |
|
622 | format data dict. If this is set *only* the format types included | |
624 | in this list will be computed. |
|
623 | in this list will be computed. | |
625 | exclude : list or tuple, optional |
|
624 | exclude : list or tuple, optional | |
626 | A list of format type string (MIME types) to exclue in the format |
|
625 | A list of format type string (MIME types) to exclue in the format | |
627 | data dict. If this is set all format types will be computed, |
|
626 | data dict. If this is set all format types will be computed, | |
628 | except for those included in this argument. |
|
627 | except for those included in this argument. | |
629 | """ |
|
628 | """ | |
630 | from IPython.core.interactiveshell import InteractiveShell |
|
629 | from IPython.core.interactiveshell import InteractiveShell | |
631 |
|
630 | |||
632 | InteractiveShell.instance().display_formatter.format( |
|
631 | InteractiveShell.instance().display_formatter.format( | |
633 | obj, |
|
632 | obj, | |
634 | include, |
|
633 | include, | |
635 | exclude |
|
634 | exclude | |
636 | ) |
|
635 | ) | |
637 |
|
636 |
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