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1 | """ Use pretty.py for configurable pretty-printing. | |
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2 | ||
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3 | Register pretty-printers for types using pretty.for_type() or | |
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4 | pretty.for_type_by_name(). For example, to make a pretty-printer for numpy dtype | |
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5 | objects, add the following to your ipy_user_conf.py:: | |
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6 | ||
|
7 | from IPython.Extensions import ipy_pretty, pretty | |
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8 | ||
|
9 | def dtype_pprinter(obj, p, cycle): | |
|
10 | if cycle: | |
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11 | return p.text('dtype(...)') | |
|
12 | if obj.fields is None: | |
|
13 | p.text(repr(obj)) | |
|
14 | else: | |
|
15 | p.begin_group(7, 'dtype([') | |
|
16 | for i, field in enumerate(obj.descr): | |
|
17 | if i > 0: | |
|
18 | p.text(',') | |
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19 | p.breakable() | |
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20 | p.pretty(field) | |
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21 | p.end_group(7, '])') | |
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22 | ||
|
23 | # If you want to have numpy always imported anyways: | |
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24 | import numpy | |
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25 | pretty.for_type(numpy.dtype, dtype_pprinter) | |
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26 | ||
|
27 | # If you don't want to have numpy imported until it needs to be: | |
|
28 | pretty.for_type_by_name('numpy', 'dtype', dtype_pprinter) | |
|
29 | """ | |
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30 | ||
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31 | import IPython.ipapi | |
|
32 | from IPython.genutils import Term | |
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33 | ||
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34 | from IPython.Extensions import pretty | |
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35 | ||
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36 | ip = IPython.ipapi.get() | |
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37 | ||
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38 | def pretty_result_display(self, arg): | |
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39 | """ Uber-pretty-printing display hook. | |
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40 | ||
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41 | Called for displaying the result to the user. | |
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42 | """ | |
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43 | ||
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44 | if self.rc.pprint: | |
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45 | out = pretty.pretty(arg, verbose=getattr(self.rc, 'pretty_verbose', False)) | |
|
46 | if '\n' in out: | |
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47 | # So that multi-line strings line up with the left column of | |
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48 | # the screen, instead of having the output prompt mess up | |
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49 | # their first line. | |
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50 | Term.cout.write('\n') | |
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51 | print >>Term.cout, out | |
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52 | else: | |
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53 | # By default, the interactive prompt uses repr() to display results, | |
|
54 | # so we should honor this. Users who'd rather use a different | |
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55 | # mechanism can easily override this hook. | |
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56 | print >>Term.cout, repr(arg) | |
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57 | # the default display hook doesn't manipulate the value to put in history | |
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58 | return None | |
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59 | ||
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60 | ip.set_hook('result_display', pretty_result_display) | |
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61 |
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1 | # -*- coding: utf-8 -*- | |
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2 | """ | |
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3 | pretty | |
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4 | ~~ | |
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5 | ||
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6 | Python advanced pretty printer. This pretty printer is intended to | |
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7 | replace the old `pprint` python module which does not allow developers | |
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8 | to provide their own pretty print callbacks. | |
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9 | ||
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10 | This module is based on ruby's `prettyprint.rb` library by `Tanaka Akira`. | |
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11 | ||
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12 | ||
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13 | Example Usage | |
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14 | ============= | |
|
15 | ||
|
16 | To directly print the representation of an object use `pprint`:: | |
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17 | ||
|
18 | from pretty import pprint | |
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19 | pprint(complex_object) | |
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20 | ||
|
21 | To get a string of the output use `pretty`:: | |
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22 | ||
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23 | from pretty import pretty | |
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24 | string = pretty(complex_object) | |
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25 | ||
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26 | ||
|
27 | Extending | |
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28 | ========= | |
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29 | ||
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30 | The pretty library allows developers to add pretty printing rules for their | |
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31 | own objects. This process is straightforward. All you have to do is to | |
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32 | add a `__pretty__` method to your object and call the methods on the | |
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33 | pretty printer passed:: | |
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34 | ||
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35 | class MyObject(object): | |
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36 | ||
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37 | def __pretty__(self, p, cycle): | |
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38 | ... | |
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39 | ||
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40 | Depending on the python version you want to support you have two | |
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41 | possibilities. The following list shows the python 2.5 version and the | |
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42 | compatibility one. | |
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43 | ||
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44 | ||
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45 | Here the example implementation of a `__pretty__` method for a list | |
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46 | subclass for python 2.5 and higher (python 2.5 requires the with statement | |
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47 | __future__ import):: | |
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48 | ||
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49 | class MyList(list): | |
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50 | ||
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51 | def __pretty__(self, p, cycle): | |
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52 | if cycle: | |
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53 | p.text('MyList(...)') | |
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54 | else: | |
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55 | with p.group(8, 'MyList([', '])'): | |
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56 | for idx, item in enumerate(self): | |
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57 | if idx: | |
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58 | p.text(',') | |
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59 | p.breakable() | |
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60 | p.pretty(item) | |
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61 | ||
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62 | The `cycle` parameter is `True` if pretty detected a cycle. You *have* to | |
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63 | react to that or the result is an infinite loop. `p.text()` just adds | |
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64 | non breaking text to the output, `p.breakable()` either adds a whitespace | |
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65 | or breaks here. If you pass it an argument it's used instead of the | |
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66 | default space. `p.pretty` prettyprints another object using the pretty print | |
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67 | method. | |
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68 | ||
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69 | The first parameter to the `group` function specifies the extra indentation | |
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70 | of the next line. In this example the next item will either be not | |
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71 | breaked (if the items are short enough) or aligned with the right edge of | |
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72 | the opening bracked of `MyList`. | |
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73 | ||
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74 | If you want to support python 2.4 and lower you can use this code:: | |
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75 | ||
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76 | class MyList(list): | |
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77 | ||
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78 | def __pretty__(self, p, cycle): | |
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79 | if cycle: | |
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80 | p.text('MyList(...)') | |
|
81 | else: | |
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82 | p.begin_group(8, 'MyList([') | |
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83 | for idx, item in enumerate(self): | |
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84 | if idx: | |
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85 | p.text(',') | |
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86 | p.breakable() | |
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87 | p.pretty(item) | |
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88 | p.end_group(8, '])') | |
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89 | ||
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90 | If you just want to indent something you can use the group function | |
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91 | without open / close parameters. Under python 2.5 you can also use this | |
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92 | code:: | |
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93 | ||
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94 | with p.indent(2): | |
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95 | ... | |
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96 | ||
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97 | Or under python2.4 you might want to modify ``p.indentation`` by hand but | |
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98 | this is rather ugly. | |
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99 | ||
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100 | :copyright: 2007 by Armin Ronacher. | |
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101 | Portions (c) 2009 by Robert Kern. | |
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102 | :license: BSD License. | |
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103 | """ | |
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104 | import __future__ | |
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105 | import sys | |
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106 | import types | |
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107 | import re | |
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108 | import datetime | |
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109 | from StringIO import StringIO | |
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110 | from collections import deque | |
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111 | ||
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112 | ||
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113 | __all__ = ['pretty', 'pprint', 'PrettyPrinter', 'RepresentationPrinter', | |
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114 | 'for_type', 'for_type_by_name'] | |
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115 | ||
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116 | ||
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117 | _re_pattern_type = type(re.compile('')) | |
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118 | ||
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119 | ||
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120 | def pretty(obj, verbose=False, max_width=79, newline='\n'): | |
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121 | """ | |
|
122 | Pretty print the object's representation. | |
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123 | """ | |
|
124 | stream = StringIO() | |
|
125 | printer = RepresentationPrinter(stream, verbose, max_width, newline) | |
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126 | printer.pretty(obj) | |
|
127 | printer.flush() | |
|
128 | return stream.getvalue() | |
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129 | ||
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130 | ||
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131 | def pprint(obj, verbose=False, max_width=79, newline='\n'): | |
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132 | """ | |
|
133 | Like `pretty` but print to stdout. | |
|
134 | """ | |
|
135 | printer = RepresentationPrinter(sys.stdout, verbose, max_width, newline) | |
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136 | printer.pretty(obj) | |
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137 | printer.flush() | |
|
138 | sys.stdout.write(newline) | |
|
139 | sys.stdout.flush() | |
|
140 | ||
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141 | ||
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142 | # add python2.5 context managers if we have the with statement feature | |
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143 | if hasattr(__future__, 'with_statement'): exec ''' | |
|
144 | from __future__ import with_statement | |
|
145 | from contextlib import contextmanager | |
|
146 | ||
|
147 | class _PrettyPrinterBase(object): | |
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148 | ||
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149 | @contextmanager | |
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150 | def indent(self, indent): | |
|
151 | """with statement support for indenting/dedenting.""" | |
|
152 | self.indentation += indent | |
|
153 | try: | |
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154 | yield | |
|
155 | finally: | |
|
156 | self.indentation -= indent | |
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157 | ||
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158 | @contextmanager | |
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159 | def group(self, indent=0, open='', close=''): | |
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160 | """like begin_group / end_group but for the with statement.""" | |
|
161 | self.begin_group(indent, open) | |
|
162 | try: | |
|
163 | with self.indent(indent): | |
|
164 | yield | |
|
165 | finally: | |
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166 | self.end_group(indent, close) | |
|
167 | ''' | |
|
168 | else: | |
|
169 | class _PrettyPrinterBase(object): | |
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170 | ||
|
171 | def _unsupported(self, *a, **kw): | |
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172 | """unsupported operation""" | |
|
173 | raise RuntimeError('not available in this python version') | |
|
174 | group = indent = _unsupported | |
|
175 | del _unsupported | |
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176 | ||
|
177 | ||
|
178 | class PrettyPrinter(_PrettyPrinterBase): | |
|
179 | """ | |
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180 | Baseclass for the `RepresentationPrinter` prettyprinter that is used to | |
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181 | generate pretty reprs of objects. Contrary to the `RepresentationPrinter` | |
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182 | this printer knows nothing about the default pprinters or the `__pretty__` | |
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183 | callback method. | |
|
184 | """ | |
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185 | ||
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186 | def __init__(self, output, max_width=79, newline='\n'): | |
|
187 | self.output = output | |
|
188 | self.max_width = max_width | |
|
189 | self.newline = newline | |
|
190 | self.output_width = 0 | |
|
191 | self.buffer_width = 0 | |
|
192 | self.buffer = deque() | |
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193 | ||
|
194 | root_group = Group(0) | |
|
195 | self.group_stack = [root_group] | |
|
196 | self.group_queue = GroupQueue(root_group) | |
|
197 | self.indentation = 0 | |
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198 | ||
|
199 | def _break_outer_groups(self): | |
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200 | while self.max_width < self.output_width + self.buffer_width: | |
|
201 | group = self.group_queue.deq() | |
|
202 | if not group: | |
|
203 | return | |
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204 | while group.breakables: | |
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205 | x = self.buffer.popleft() | |
|
206 | self.output_width = x.output(self.output, self.output_width) | |
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207 | self.buffer_width -= x.width | |
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208 | while self.buffer and isinstance(self.buffer[0], Text): | |
|
209 | x = self.buffer.popleft() | |
|
210 | self.output_width = x.output(self.output, self.output_width) | |
|
211 | self.buffer_width -= x.width | |
|
212 | ||
|
213 | def text(self, obj): | |
|
214 | """Add literal text to the output.""" | |
|
215 | width = len(obj) | |
|
216 | if self.buffer: | |
|
217 | text = self.buffer[-1] | |
|
218 | if not isinstance(text, Text): | |
|
219 | text = Text() | |
|
220 | self.buffer.append(text) | |
|
221 | text.add(obj, width) | |
|
222 | self.buffer_width += width | |
|
223 | self._break_outer_groups() | |
|
224 | else: | |
|
225 | self.output.write(obj) | |
|
226 | self.output_width += width | |
|
227 | ||
|
228 | def breakable(self, sep=' '): | |
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229 | """ | |
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230 | Add a breakable separator to the output. This does not mean that it | |
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231 | will automatically break here. If no breaking on this position takes | |
|
232 | place the `sep` is inserted which default to one space. | |
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233 | """ | |
|
234 | width = len(sep) | |
|
235 | group = self.group_stack[-1] | |
|
236 | if group.want_break: | |
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237 | self.flush() | |
|
238 | self.output.write(self.newline) | |
|
239 | self.output.write(' ' * self.indentation) | |
|
240 | self.output_width = self.indentation | |
|
241 | self.buffer_width = 0 | |
|
242 | else: | |
|
243 | self.buffer.append(Breakable(sep, width, self)) | |
|
244 | self.buffer_width += width | |
|
245 | self._break_outer_groups() | |
|
246 | ||
|
247 | ||
|
248 | def begin_group(self, indent=0, open=''): | |
|
249 | """ | |
|
250 | Begin a group. If you want support for python < 2.5 which doesn't has | |
|
251 | the with statement this is the preferred way: | |
|
252 | ||
|
253 | p.begin_group(1, '{') | |
|
254 | ... | |
|
255 | p.end_group(1, '}') | |
|
256 | ||
|
257 | The python 2.5 expression would be this: | |
|
258 | ||
|
259 | with p.group(1, '{', '}'): | |
|
260 | ... | |
|
261 | ||
|
262 | The first parameter specifies the indentation for the next line (usually | |
|
263 | the width of the opening text), the second the opening text. All | |
|
264 | parameters are optional. | |
|
265 | """ | |
|
266 | if open: | |
|
267 | self.text(open) | |
|
268 | group = Group(self.group_stack[-1].depth + 1) | |
|
269 | self.group_stack.append(group) | |
|
270 | self.group_queue.enq(group) | |
|
271 | self.indentation += indent | |
|
272 | ||
|
273 | def end_group(self, dedent=0, close=''): | |
|
274 | """End a group. See `begin_group` for more details.""" | |
|
275 | self.indentation -= dedent | |
|
276 | group = self.group_stack.pop() | |
|
277 | if not group.breakables: | |
|
278 | self.group_queue.remove(group) | |
|
279 | if close: | |
|
280 | self.text(close) | |
|
281 | ||
|
282 | def flush(self): | |
|
283 | """Flush data that is left in the buffer.""" | |
|
284 | for data in self.buffer: | |
|
285 | self.output_width += data.output(self.output, self.output_width) | |
|
286 | self.buffer.clear() | |
|
287 | self.buffer_width = 0 | |
|
288 | ||
|
289 | ||
|
290 | def _get_mro(obj_class): | |
|
291 | """ Get a reasonable method resolution order of a class and its superclasses | |
|
292 | for both old-style and new-style classes. | |
|
293 | """ | |
|
294 | if not hasattr(obj_class, '__mro__'): | |
|
295 | # Old-style class. Mix in object to make a fake new-style class. | |
|
296 | obj_class = type(obj_class.__name__, (obj_class, object), {}) | |
|
297 | mro = obj_class.__mro__[1:-1] | |
|
298 | else: | |
|
299 | mro = obj_class.__mro__ | |
|
300 | return mro | |
|
301 | ||
|
302 | ||
|
303 | class RepresentationPrinter(PrettyPrinter): | |
|
304 | """ | |
|
305 | Special pretty printer that has a `pretty` method that calls the pretty | |
|
306 | printer for a python object. | |
|
307 | ||
|
308 | This class stores processing data on `self` so you must *never* use | |
|
309 | this class in a threaded environment. Always lock it or reinstanciate | |
|
310 | it. | |
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311 | ||
|
312 | Instances also have a verbose flag callbacks can access to control their | |
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313 | output. For example the default instance repr prints all attributes and | |
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314 | methods that are not prefixed by an underscore if the printer is in | |
|
315 | verbose mode. | |
|
316 | """ | |
|
317 | ||
|
318 | def __init__(self, output, verbose=False, max_width=79, newline='\n'): | |
|
319 | PrettyPrinter.__init__(self, output, max_width, newline) | |
|
320 | self.verbose = verbose | |
|
321 | self.stack = [] | |
|
322 | ||
|
323 | def pretty(self, obj): | |
|
324 | """Pretty print the given object.""" | |
|
325 | obj_id = id(obj) | |
|
326 | cycle = obj_id in self.stack | |
|
327 | self.stack.append(obj_id) | |
|
328 | self.begin_group() | |
|
329 | try: | |
|
330 | obj_class = getattr(obj, '__class__', None) or type(obj) | |
|
331 | if hasattr(obj_class, '__pretty__'): | |
|
332 | return obj_class.__pretty__(obj, self, cycle) | |
|
333 | try: | |
|
334 | printer = _singleton_pprinters[obj_id] | |
|
335 | except (TypeError, KeyError): | |
|
336 | pass | |
|
337 | else: | |
|
338 | return printer(obj, self, cycle) | |
|
339 | for cls in _get_mro(obj_class): | |
|
340 | if cls in _type_pprinters: | |
|
341 | return _type_pprinters[cls](obj, self, cycle) | |
|
342 | else: | |
|
343 | printer = self._in_deferred_types(cls) | |
|
344 | if printer is not None: | |
|
345 | return printer(obj, self, cycle) | |
|
346 | return _default_pprint(obj, self, cycle) | |
|
347 | finally: | |
|
348 | self.end_group() | |
|
349 | self.stack.pop() | |
|
350 | ||
|
351 | def _in_deferred_types(self, cls): | |
|
352 | """ | |
|
353 | Check if the given class is specified in the deferred type registry. | |
|
354 | ||
|
355 | Returns the printer from the registry if it exists, and None if the | |
|
356 | class is not in the registry. Successful matches will be moved to the | |
|
357 | regular type registry for future use. | |
|
358 | """ | |
|
359 | mod = getattr(cls, '__module__', None) | |
|
360 | name = getattr(cls, '__name__', None) | |
|
361 | key = (mod, name) | |
|
362 | printer = None | |
|
363 | if key in _deferred_type_pprinters: | |
|
364 | # Move the printer over to the regular registry. | |
|
365 | printer = _deferred_type_pprinters.pop(key) | |
|
366 | _type_pprinters[cls] = printer | |
|
367 | return printer | |
|
368 | ||
|
369 | ||
|
370 | ||
|
371 | class Printable(object): | |
|
372 | ||
|
373 | def output(self, stream, output_width): | |
|
374 | return output_width | |
|
375 | ||
|
376 | ||
|
377 | class Text(Printable): | |
|
378 | ||
|
379 | def __init__(self): | |
|
380 | self.objs = [] | |
|
381 | self.width = 0 | |
|
382 | ||
|
383 | def output(self, stream, output_width): | |
|
384 | for obj in self.objs: | |
|
385 | stream.write(obj) | |
|
386 | return output_width + self.width | |
|
387 | ||
|
388 | def add(self, obj, width): | |
|
389 | self.objs.append(obj) | |
|
390 | self.width += width | |
|
391 | ||
|
392 | ||
|
393 | class Breakable(Printable): | |
|
394 | ||
|
395 | def __init__(self, seq, width, pretty): | |
|
396 | self.obj = seq | |
|
397 | self.width = width | |
|
398 | self.pretty = pretty | |
|
399 | self.indentation = pretty.indentation | |
|
400 | self.group = pretty.group_stack[-1] | |
|
401 | self.group.breakables.append(self) | |
|
402 | ||
|
403 | def output(self, stream, output_width): | |
|
404 | self.group.breakables.popleft() | |
|
405 | if self.group.want_break: | |
|
406 | stream.write(self.pretty.newline) | |
|
407 | stream.write(' ' * self.indentation) | |
|
408 | return self.indentation | |
|
409 | if not self.group.breakables: | |
|
410 | self.pretty.group_queue.remove(self.group) | |
|
411 | stream.write(self.obj) | |
|
412 | return output_width + self.width | |
|
413 | ||
|
414 | ||
|
415 | class Group(Printable): | |
|
416 | ||
|
417 | def __init__(self, depth): | |
|
418 | self.depth = depth | |
|
419 | self.breakables = deque() | |
|
420 | self.want_break = False | |
|
421 | ||
|
422 | ||
|
423 | class GroupQueue(object): | |
|
424 | ||
|
425 | def __init__(self, *groups): | |
|
426 | self.queue = [] | |
|
427 | for group in groups: | |
|
428 | self.enq(group) | |
|
429 | ||
|
430 | def enq(self, group): | |
|
431 | depth = group.depth | |
|
432 | while depth > len(self.queue) - 1: | |
|
433 | self.queue.append([]) | |
|
434 | self.queue[depth].append(group) | |
|
435 | ||
|
436 | def deq(self): | |
|
437 | for stack in self.queue: | |
|
438 | for idx, group in enumerate(reversed(stack)): | |
|
439 | if group.breakables: | |
|
440 | del stack[idx] | |
|
441 | group.want_break = True | |
|
442 | return group | |
|
443 | for group in stack: | |
|
444 | group.want_break = True | |
|
445 | del stack[:] | |
|
446 | ||
|
447 | def remove(self, group): | |
|
448 | try: | |
|
449 | self.queue[group.depth].remove(group) | |
|
450 | except ValueError: | |
|
451 | pass | |
|
452 | ||
|
453 | ||
|
454 | _baseclass_reprs = (object.__repr__, types.InstanceType.__repr__) | |
|
455 | ||
|
456 | ||
|
457 | def _default_pprint(obj, p, cycle): | |
|
458 | """ | |
|
459 | The default print function. Used if an object does not provide one and | |
|
460 | it's none of the builtin objects. | |
|
461 | """ | |
|
462 | klass = getattr(obj, '__class__', None) or type(obj) | |
|
463 | if getattr(klass, '__repr__', None) not in _baseclass_reprs: | |
|
464 | # A user-provided repr. | |
|
465 | p.text(repr(obj)) | |
|
466 | return | |
|
467 | p.begin_group(1, '<') | |
|
468 | p.pretty(klass) | |
|
469 | p.text(' at 0x%x' % id(obj)) | |
|
470 | if cycle: | |
|
471 | p.text(' ...') | |
|
472 | elif p.verbose: | |
|
473 | first = True | |
|
474 | for key in dir(obj): | |
|
475 | if not key.startswith('_'): | |
|
476 | try: | |
|
477 | value = getattr(obj, key) | |
|
478 | except AttributeError: | |
|
479 | continue | |
|
480 | if isinstance(value, types.MethodType): | |
|
481 | continue | |
|
482 | if not first: | |
|
483 | p.text(',') | |
|
484 | p.breakable() | |
|
485 | p.text(key) | |
|
486 | p.text('=') | |
|
487 | step = len(key) + 1 | |
|
488 | p.indentation += step | |
|
489 | p.pretty(value) | |
|
490 | p.indentation -= step | |
|
491 | first = False | |
|
492 | p.end_group(1, '>') | |
|
493 | ||
|
494 | ||
|
495 | def _seq_pprinter_factory(start, end): | |
|
496 | """ | |
|
497 | Factory that returns a pprint function useful for sequences. Used by | |
|
498 | the default pprint for tuples, dicts, lists, sets and frozensets. | |
|
499 | """ | |
|
500 | def inner(obj, p, cycle): | |
|
501 | if cycle: | |
|
502 | return p.text(start + '...' + end) | |
|
503 | step = len(start) | |
|
504 | p.begin_group(step, start) | |
|
505 | for idx, x in enumerate(obj): | |
|
506 | if idx: | |
|
507 | p.text(',') | |
|
508 | p.breakable() | |
|
509 | p.pretty(x) | |
|
510 | if len(obj) == 1 and type(obj) is tuple: | |
|
511 | # Special case for 1-item tuples. | |
|
512 | p.text(',') | |
|
513 | p.end_group(step, end) | |
|
514 | return inner | |
|
515 | ||
|
516 | ||
|
517 | def _dict_pprinter_factory(start, end): | |
|
518 | """ | |
|
519 | Factory that returns a pprint function used by the default pprint of | |
|
520 | dicts and dict proxies. | |
|
521 | """ | |
|
522 | def inner(obj, p, cycle): | |
|
523 | if cycle: | |
|
524 | return p.text('{...}') | |
|
525 | p.begin_group(1, start) | |
|
526 | keys = obj.keys() | |
|
527 | try: | |
|
528 | keys.sort() | |
|
529 | except Exception, e: | |
|
530 | # Sometimes the keys don't sort. | |
|
531 | pass | |
|
532 | for idx, key in enumerate(keys): | |
|
533 | if idx: | |
|
534 | p.text(',') | |
|
535 | p.breakable() | |
|
536 | p.pretty(key) | |
|
537 | p.text(': ') | |
|
538 | p.pretty(obj[key]) | |
|
539 | p.end_group(1, end) | |
|
540 | return inner | |
|
541 | ||
|
542 | ||
|
543 | def _super_pprint(obj, p, cycle): | |
|
544 | """The pprint for the super type.""" | |
|
545 | p.begin_group(8, '<super: ') | |
|
546 | p.pretty(obj.__self_class__) | |
|
547 | p.text(',') | |
|
548 | p.breakable() | |
|
549 | p.pretty(obj.__self__) | |
|
550 | p.end_group(8, '>') | |
|
551 | ||
|
552 | ||
|
553 | def _re_pattern_pprint(obj, p, cycle): | |
|
554 | """The pprint function for regular expression patterns.""" | |
|
555 | p.text('re.compile(') | |
|
556 | pattern = repr(obj.pattern) | |
|
557 | if pattern[:1] in 'uU': | |
|
558 | pattern = pattern[1:] | |
|
559 | prefix = 'ur' | |
|
560 | else: | |
|
561 | prefix = 'r' | |
|
562 | pattern = prefix + pattern.replace('\\\\', '\\') | |
|
563 | p.text(pattern) | |
|
564 | if obj.flags: | |
|
565 | p.text(',') | |
|
566 | p.breakable() | |
|
567 | done_one = False | |
|
568 | for flag in ('TEMPLATE', 'IGNORECASE', 'LOCALE', 'MULTILINE', 'DOTALL', | |
|
569 | 'UNICODE', 'VERBOSE', 'DEBUG'): | |
|
570 | if obj.flags & getattr(re, flag): | |
|
571 | if done_one: | |
|
572 | p.text('|') | |
|
573 | p.text('re.' + flag) | |
|
574 | done_one = True | |
|
575 | p.text(')') | |
|
576 | ||
|
577 | ||
|
578 | def _type_pprint(obj, p, cycle): | |
|
579 | """The pprint for classes and types.""" | |
|
580 | if obj.__module__ in ('__builtin__', 'exceptions'): | |
|
581 | name = obj.__name__ | |
|
582 | else: | |
|
583 | name = obj.__module__ + '.' + obj.__name__ | |
|
584 | p.text(name) | |
|
585 | ||
|
586 | ||
|
587 | def _repr_pprint(obj, p, cycle): | |
|
588 | """A pprint that just redirects to the normal repr function.""" | |
|
589 | p.text(repr(obj)) | |
|
590 | ||
|
591 | ||
|
592 | def _function_pprint(obj, p, cycle): | |
|
593 | """Base pprint for all functions and builtin functions.""" | |
|
594 | if obj.__module__ in ('__builtin__', 'exceptions') or not obj.__module__: | |
|
595 | name = obj.__name__ | |
|
596 | else: | |
|
597 | name = obj.__module__ + '.' + obj.__name__ | |
|
598 | p.text('<function %s>' % name) | |
|
599 | ||
|
600 | ||
|
601 | def _exception_pprint(obj, p, cycle): | |
|
602 | """Base pprint for all exceptions.""" | |
|
603 | if obj.__class__.__module__ == 'exceptions': | |
|
604 | name = obj.__class__.__name__ | |
|
605 | else: | |
|
606 | name = '%s.%s' % ( | |
|
607 | obj.__class__.__module__, | |
|
608 | obj.__class__.__name__ | |
|
609 | ) | |
|
610 | step = len(name) + 1 | |
|
611 | p.begin_group(step, '(') | |
|
612 | for idx, arg in enumerate(getattr(obj, 'args', ())): | |
|
613 | if idx: | |
|
614 | p.text(',') | |
|
615 | p.breakable() | |
|
616 | p.pretty(arg) | |
|
617 | p.end_group(step, ')') | |
|
618 | ||
|
619 | ||
|
620 | #: the exception base | |
|
621 | try: | |
|
622 | _exception_base = BaseException | |
|
623 | except NameError: | |
|
624 | _exception_base = Exception | |
|
625 | ||
|
626 | ||
|
627 | #: printers for builtin types | |
|
628 | _type_pprinters = { | |
|
629 | int: _repr_pprint, | |
|
630 | long: _repr_pprint, | |
|
631 | float: _repr_pprint, | |
|
632 | str: _repr_pprint, | |
|
633 | unicode: _repr_pprint, | |
|
634 | tuple: _seq_pprinter_factory('(', ')'), | |
|
635 | list: _seq_pprinter_factory('[', ']'), | |
|
636 | dict: _dict_pprinter_factory('{', '}'), | |
|
637 | types.DictProxyType: _dict_pprinter_factory('<dictproxy {', '}>'), | |
|
638 | set: _seq_pprinter_factory('set([', '])'), | |
|
639 | frozenset: _seq_pprinter_factory('frozenset([', '])'), | |
|
640 | super: _super_pprint, | |
|
641 | _re_pattern_type: _re_pattern_pprint, | |
|
642 | type: _type_pprint, | |
|
643 | types.ClassType: _type_pprint, | |
|
644 | types.FunctionType: _function_pprint, | |
|
645 | types.BuiltinFunctionType: _function_pprint, | |
|
646 | types.SliceType: _repr_pprint, | |
|
647 | types.MethodType: _repr_pprint, | |
|
648 | xrange: _repr_pprint, | |
|
649 | datetime.datetime: _repr_pprint, | |
|
650 | datetime.timedelta: _repr_pprint, | |
|
651 | _exception_base: _exception_pprint | |
|
652 | } | |
|
653 | ||
|
654 | #: printers for types specified by name | |
|
655 | _deferred_type_pprinters = { | |
|
656 | } | |
|
657 | ||
|
658 | def for_type(typ, func): | |
|
659 | """ | |
|
660 | Add a pretty printer for a given type. | |
|
661 | """ | |
|
662 | oldfunc = _type_pprinters.get(typ, None) | |
|
663 | if func is not None: | |
|
664 | # To support easy restoration of old pprinters, we need to ignore Nones. | |
|
665 | _type_pprinters[typ] = func | |
|
666 | return oldfunc | |
|
667 | ||
|
668 | def for_type_by_name(type_module, type_name, func): | |
|
669 | """ | |
|
670 | Add a pretty printer for a type specified by the module and name of a type | |
|
671 | rather than the type object itself. | |
|
672 | """ | |
|
673 | key = (type_module, type_name) | |
|
674 | oldfunc = _deferred_type_pprinters.get(key, None) | |
|
675 | if func is not None: | |
|
676 | # To support easy restoration of old pprinters, we need to ignore Nones. | |
|
677 | _deferred_type_pprinters[key] = func | |
|
678 | return oldfunc | |
|
679 | ||
|
680 | ||
|
681 | #: printers for the default singletons | |
|
682 | _singleton_pprinters = dict.fromkeys(map(id, [None, True, False, Ellipsis, | |
|
683 | NotImplemented]), _repr_pprint) | |
|
684 | ||
|
685 | ||
|
686 | if __name__ == '__main__': | |
|
687 | from random import randrange | |
|
688 | class Foo(object): | |
|
689 | def __init__(self): | |
|
690 | self.foo = 1 | |
|
691 | self.bar = re.compile(r'\s+') | |
|
692 | self.blub = dict.fromkeys(range(30), randrange(1, 40)) | |
|
693 | self.hehe = 23424.234234 | |
|
694 | self.list = ["blub", "blah", self] | |
|
695 | ||
|
696 | def get_foo(self): | |
|
697 | print "foo" | |
|
698 | ||
|
699 | pprint(Foo(), verbose=True) |
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