/usr/share/pyshared/epydoc/markup/pyval_repr.py is in python-epydoc 3.0.1+dfsg-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 | # epydoc -- Marked-up Representations for Python Values
#
# Copyright (C) 2005 Edward Loper
# Author: Edward Loper <edloper@loper.org>
# URL: <http://epydoc.sf.net>
#
# $Id: apidoc.py 1448 2007-02-11 00:05:34Z dvarrazzo $
"""
Syntax highlighter for Python values. Currently provides special
colorization support for:
- lists, tuples, sets, frozensets, dicts
- numbers
- strings
- compiled regexps
The highlighter also takes care of line-wrapping, and automatically
stops generating repr output as soon as it has exceeded the specified
number of lines (which should make it faster than pprint for large
values). It does I{not} bother to do automatic cycle detection,
because maxlines is typically around 5, so it's really not worth it.
The syntax-highlighted output is encoded using a
L{ParsedEpytextDocstring}, which can then be used to generate output in
a variety of formats.
"""
__docformat__ = 'epytext en'
# Implementation note: we use exact tests for classes (list, etc)
# rather than using isinstance, because subclasses might override
# __repr__.
import types, re
import epydoc.apidoc
from epydoc.util import decode_with_backslashreplace
from epydoc.util import plaintext_to_html, plaintext_to_latex
from epydoc.compat import *
import sre_parse, sre_constants
from epydoc.markup.epytext import Element, ParsedEpytextDocstring
def is_re_pattern(pyval):
return type(pyval).__name__ == 'SRE_Pattern'
class _ColorizerState:
"""
An object uesd to keep track of the current state of the pyval
colorizer. The L{mark()}/L{restore()} methods can be used to set
a backup point, and restore back to that backup point. This is
used by several colorization methods that first try colorizing
their object on a single line (setting linebreakok=False); and
then fall back on a multi-line output if that fails. The L{score}
variable is used to keep track of a 'score', reflecting how good
we think this repr is. E.g., unhelpful values like '<Foo instance
at 0x12345>' get low scores. If the score is too low, we'll use
the parse-derived repr instead.
"""
def __init__(self):
self.result = []
self.charpos = 0
self.lineno = 1
self.linebreakok = True
#: How good this represention is?
self.score = 0
def mark(self):
return (len(self.result), self.charpos,
self.lineno, self.linebreakok, self.score)
def restore(self, mark):
n, self.charpos, self.lineno, self.linebreakok, self.score = mark
del self.result[n:]
class _Maxlines(Exception):
"""A control-flow exception that is raised when PyvalColorizer
exeeds the maximum number of allowed lines."""
class _Linebreak(Exception):
"""A control-flow exception that is raised when PyvalColorizer
generates a string containing a newline, but the state object's
linebreakok variable is False."""
class ColorizedPyvalRepr(ParsedEpytextDocstring):
"""
@ivar score: A score, evaluating how good this repr is.
@ivar is_complete: True if this colorized repr completely describes
the object.
"""
def __init__(self, tree, score, is_complete):
ParsedEpytextDocstring.__init__(self, tree)
self.score = score
self.is_complete = is_complete
def colorize_pyval(pyval, parse_repr=None, min_score=None,
linelen=75, maxlines=5, linebreakok=True, sort=True):
return PyvalColorizer(linelen, maxlines, linebreakok, sort).colorize(
pyval, parse_repr, min_score)
class PyvalColorizer:
"""
Syntax highlighter for Python values.
"""
def __init__(self, linelen=75, maxlines=5, linebreakok=True, sort=True):
self.linelen = linelen
self.maxlines = maxlines
self.linebreakok = linebreakok
self.sort = sort
#////////////////////////////////////////////////////////////
# Colorization Tags & other constants
#////////////////////////////////////////////////////////////
GROUP_TAG = 'variable-group' # e.g., "[" and "]"
COMMA_TAG = 'variable-op' # The "," that separates elements
COLON_TAG = 'variable-op' # The ":" in dictionaries
CONST_TAG = None # None, True, False
NUMBER_TAG = None # ints, floats, etc
QUOTE_TAG = 'variable-quote' # Quotes around strings.
STRING_TAG = 'variable-string' # Body of string literals
RE_CHAR_TAG = None
RE_GROUP_TAG = 're-group'
RE_REF_TAG = 're-ref'
RE_OP_TAG = 're-op'
RE_FLAGS_TAG = 're-flags'
ELLIPSIS = Element('code', u'...', style='variable-ellipsis')
LINEWRAP = Element('symbol', u'crarr')
UNKNOWN_REPR = Element('code', u'??', style='variable-unknown')
GENERIC_OBJECT_RE = re.compile(r'^<.* at 0x[0-9a-f]+>$', re.IGNORECASE)
ESCAPE_UNICODE = False # should we escape non-ascii unicode chars?
#////////////////////////////////////////////////////////////
# Entry Point
#////////////////////////////////////////////////////////////
def colorize(self, pyval, parse_repr=None, min_score=None):
"""
@return: A L{ColorizedPyvalRepr} describing the given pyval.
"""
UNKNOWN = epydoc.apidoc.UNKNOWN
# Create an object to keep track of the colorization.
state = _ColorizerState()
state.linebreakok = self.linebreakok
# Colorize the value. If we reach maxlines, then add on an
# ellipsis marker and call it a day.
try:
if pyval is not UNKNOWN:
self._colorize(pyval, state)
elif parse_repr not in (None, UNKNOWN):
self._output(parse_repr, None, state)
else:
state.result.append(PyvalColorizer.UNKNOWN_REPR)
is_complete = True
except (_Maxlines, _Linebreak):
if self.linebreakok:
state.result.append('\n')
state.result.append(self.ELLIPSIS)
else:
if state.result[-1] is self.LINEWRAP:
state.result.pop()
self._trim_result(state.result, 3)
state.result.append(self.ELLIPSIS)
is_complete = False
# If we didn't score high enough, then try again.
if (pyval is not UNKNOWN and parse_repr not in (None, UNKNOWN)
and min_score is not None and state.score < min_score):
return self.colorize(UNKNOWN, parse_repr)
# Put it all together.
tree = Element('epytext', *state.result)
return ColorizedPyvalRepr(tree, state.score, is_complete)
def _colorize(self, pyval, state):
pyval_type = type(pyval)
state.score += 1
if pyval is None or pyval is True or pyval is False:
self._output(unicode(pyval), self.CONST_TAG, state)
elif pyval_type in (int, float, long, types.ComplexType):
self._output(unicode(pyval), self.NUMBER_TAG, state)
elif pyval_type is str:
self._colorize_str(pyval, state, '', 'string-escape')
elif pyval_type is unicode:
if self.ESCAPE_UNICODE:
self._colorize_str(pyval, state, 'u', 'unicode-escape')
else:
self._colorize_str(pyval, state, 'u', None)
elif pyval_type is list:
self._multiline(self._colorize_iter, pyval, state, '[', ']')
elif pyval_type is tuple:
self._multiline(self._colorize_iter, pyval, state, '(', ')')
elif pyval_type is set:
self._multiline(self._colorize_iter, self._sort(pyval),
state, 'set([', '])')
elif pyval_type is frozenset:
self._multiline(self._colorize_iter, self._sort(pyval),
state, 'frozenset([', '])')
elif pyval_type is dict:
self._multiline(self._colorize_dict, self._sort(pyval.items()),
state, '{', '}')
elif is_re_pattern(pyval):
self._colorize_re(pyval, state)
else:
try:
pyval_repr = repr(pyval)
if not isinstance(pyval_repr, (str, unicode)):
pyval_repr = unicode(pyval_repr)
pyval_repr_ok = True
except KeyboardInterrupt:
raise
except:
pyval_repr_ok = False
state.score -= 100
if pyval_repr_ok:
if self.GENERIC_OBJECT_RE.match(pyval_repr):
state.score -= 5
self._output(pyval_repr, None, state)
else:
state.result.append(self.UNKNOWN_REPR)
def _sort(self, items):
if not self.sort: return items
try: return sorted(items)
except KeyboardInterrupt: raise
except: return items
def _trim_result(self, result, num_chars):
while num_chars > 0:
if not result: return
if isinstance(result[-1], Element):
assert len(result[-1].children) == 1
trim = min(num_chars, len(result[-1].children[0]))
result[-1].children[0] = result[-1].children[0][:-trim]
if not result[-1].children[0]: result.pop()
num_chars -= trim
else:
trim = min(num_chars, len(result[-1]))
result[-1] = result[-1][:-trim]
if not result[-1]: result.pop()
num_chars -= trim
#////////////////////////////////////////////////////////////
# Object Colorization Functions
#////////////////////////////////////////////////////////////
def _multiline(self, func, pyval, state, *args):
"""
Helper for container-type colorizers. First, try calling
C{func(pyval, state, *args)} with linebreakok set to false;
and if that fails, then try again with it set to true.
"""
linebreakok = state.linebreakok
mark = state.mark()
try:
state.linebreakok = False
func(pyval, state, *args)
state.linebreakok = linebreakok
except _Linebreak:
if not linebreakok:
raise
state.restore(mark)
func(pyval, state, *args)
def _colorize_iter(self, pyval, state, prefix, suffix):
self._output(prefix, self.GROUP_TAG, state)
indent = state.charpos
for i, elt in enumerate(pyval):
if i>=1:
if state.linebreakok:
self._output(',', self.COMMA_TAG, state)
self._output('\n'+' '*indent, None, state)
else:
self._output(', ', self.COMMA_TAG, state)
self._colorize(elt, state)
self._output(suffix, self.GROUP_TAG, state)
def _colorize_dict(self, items, state, prefix, suffix):
self._output(prefix, self.GROUP_TAG, state)
indent = state.charpos
for i, (key, val) in enumerate(items):
if i>=1:
if state.linebreakok:
self._output(',', self.COMMA_TAG, state)
self._output('\n'+' '*indent, None, state)
else:
self._output(', ', self.COMMA_TAG, state)
self._colorize(key, state)
self._output(': ', self.COLON_TAG, state)
self._colorize(val, state)
self._output(suffix, self.GROUP_TAG, state)
def _colorize_str(self, pyval, state, prefix, encoding):
# Decide which quote to use.
if '\n' in pyval and state.linebreakok: quote = "'''"
else: quote = "'"
# Divide the string into lines.
if state.linebreakok:
lines = pyval.split('\n')
else:
lines = [pyval]
# Open quote.
self._output(prefix+quote, self.QUOTE_TAG, state)
# Body
for i, line in enumerate(lines):
if i>0: self._output('\n', None, state)
if encoding: line = line.encode(encoding)
self._output(line, self.STRING_TAG, state)
# Close quote.
self._output(quote, self.QUOTE_TAG, state)
def _colorize_re(self, pyval, state):
# Extract the flag & pattern from the regexp.
pat, flags = pyval.pattern, pyval.flags
# If the pattern is a string, decode it to unicode.
if isinstance(pat, str):
pat = decode_with_backslashreplace(pat)
# Parse the regexp pattern.
tree = sre_parse.parse(pat, flags)
groups = dict([(num,name) for (name,num) in
tree.pattern.groupdict.items()])
# Colorize it!
self._output("re.compile(r'", None, state)
self._colorize_re_flags(tree.pattern.flags, state)
self._colorize_re_tree(tree, state, True, groups)
self._output("')", None, state)
def _colorize_re_flags(self, flags, state):
if flags:
flags = [c for (c,n) in sorted(sre_parse.FLAGS.items())
if (n&flags)]
flags = '(?%s)' % ''.join(flags)
self._output(flags, self.RE_FLAGS_TAG, state)
def _colorize_re_tree(self, tree, state, noparen, groups):
assert noparen in (True, False)
if len(tree) > 1 and not noparen:
self._output('(', self.RE_GROUP_TAG, state)
for elt in tree:
op = elt[0]
args = elt[1]
if op == sre_constants.LITERAL:
c = unichr(args)
# Add any appropriate escaping.
if c in '.^$\\*+?{}[]|()\'': c = '\\'+c
elif c == '\t': c = '\\t'
elif c == '\r': c = '\\r'
elif c == '\n': c = '\\n'
elif c == '\f': c = '\\f'
elif c == '\v': c = '\\v'
elif ord(c) > 0xffff: c = r'\U%08x' % ord(c)
elif ord(c) > 0xff: c = r'\u%04x' % ord(c)
elif ord(c)<32 or ord(c)>=127: c = r'\x%02x' % ord(c)
self._output(c, self.RE_CHAR_TAG, state)
elif op == sre_constants.ANY:
self._output('.', self.RE_CHAR_TAG, state)
elif op == sre_constants.BRANCH:
if args[0] is not None:
raise ValueError('Branch expected None arg but got %s'
% args[0])
for i, item in enumerate(args[1]):
if i > 0:
self._output('|', self.RE_OP_TAG, state)
self._colorize_re_tree(item, state, True, groups)
elif op == sre_constants.IN:
if (len(args) == 1 and args[0][0] == sre_constants.CATEGORY):
self._colorize_re_tree(args, state, False, groups)
else:
self._output('[', self.RE_GROUP_TAG, state)
self._colorize_re_tree(args, state, True, groups)
self._output(']', self.RE_GROUP_TAG, state)
elif op == sre_constants.CATEGORY:
if args == sre_constants.CATEGORY_DIGIT: val = r'\d'
elif args == sre_constants.CATEGORY_NOT_DIGIT: val = r'\D'
elif args == sre_constants.CATEGORY_SPACE: val = r'\s'
elif args == sre_constants.CATEGORY_NOT_SPACE: val = r'\S'
elif args == sre_constants.CATEGORY_WORD: val = r'\w'
elif args == sre_constants.CATEGORY_NOT_WORD: val = r'\W'
else: raise ValueError('Unknown category %s' % args)
self._output(val, self.RE_CHAR_TAG, state)
elif op == sre_constants.AT:
if args == sre_constants.AT_BEGINNING_STRING: val = r'\A'
elif args == sre_constants.AT_BEGINNING: val = r'^'
elif args == sre_constants.AT_END: val = r'$'
elif args == sre_constants.AT_BOUNDARY: val = r'\b'
elif args == sre_constants.AT_NON_BOUNDARY: val = r'\B'
elif args == sre_constants.AT_END_STRING: val = r'\Z'
else: raise ValueError('Unknown position %s' % args)
self._output(val, self.RE_CHAR_TAG, state)
elif op in (sre_constants.MAX_REPEAT, sre_constants.MIN_REPEAT):
minrpt = args[0]
maxrpt = args[1]
if maxrpt == sre_constants.MAXREPEAT:
if minrpt == 0: val = '*'
elif minrpt == 1: val = '+'
else: val = '{%d,}' % (minrpt)
elif minrpt == 0:
if maxrpt == 1: val = '?'
else: val = '{,%d}' % (maxrpt)
elif minrpt == maxrpt:
val = '{%d}' % (maxrpt)
else:
val = '{%d,%d}' % (minrpt, maxrpt)
if op == sre_constants.MIN_REPEAT:
val += '?'
self._colorize_re_tree(args[2], state, False, groups)
self._output(val, self.RE_OP_TAG, state)
elif op == sre_constants.SUBPATTERN:
if args[0] is None:
self._output('(?:', self.RE_GROUP_TAG, state)
elif args[0] in groups:
self._output('(?P<', self.RE_GROUP_TAG, state)
self._output(groups[args[0]], self.RE_REF_TAG, state)
self._output('>', self.RE_GROUP_TAG, state)
elif isinstance(args[0], (int, long)):
# This is cheating:
self._output('(', self.RE_GROUP_TAG, state)
else:
self._output('(?P<', self.RE_GROUP_TAG, state)
self._output(args[0], self.RE_REF_TAG, state)
self._output('>', self.RE_GROUP_TAG, state)
self._colorize_re_tree(args[1], state, True, groups)
self._output(')', self.RE_GROUP_TAG, state)
elif op == sre_constants.GROUPREF:
self._output('\\%d' % args, self.RE_REF_TAG, state)
elif op == sre_constants.RANGE:
self._colorize_re_tree( ((sre_constants.LITERAL, args[0]),),
state, False, groups )
self._output('-', self.RE_OP_TAG, state)
self._colorize_re_tree( ((sre_constants.LITERAL, args[1]),),
state, False, groups )
elif op == sre_constants.NEGATE:
self._output('^', self.RE_OP_TAG, state)
elif op == sre_constants.ASSERT:
if args[0] > 0:
self._output('(?=', self.RE_GROUP_TAG, state)
else:
self._output('(?<=', self.RE_GROUP_TAG, state)
self._colorize_re_tree(args[1], state, True, groups)
self._output(')', self.RE_GROUP_TAG, state)
elif op == sre_constants.ASSERT_NOT:
if args[0] > 0:
self._output('(?!', self.RE_GROUP_TAG, state)
else:
self._output('(?<!', self.RE_GROUP_TAG, state)
self._colorize_re_tree(args[1], state, True, groups)
self._output(')', self.RE_GROUP_TAG, state)
elif op == sre_constants.NOT_LITERAL:
self._output('[^', self.RE_GROUP_TAG, state)
self._colorize_re_tree( ((sre_constants.LITERAL, args),),
state, False, groups )
self._output(']', self.RE_GROUP_TAG, state)
else:
log.error("Error colorizing regexp: unknown elt %r" % elt)
if len(tree) > 1 and not noparen:
self._output(')', self.RE_GROUP_TAG, state)
#////////////////////////////////////////////////////////////
# Output function
#////////////////////////////////////////////////////////////
def _output(self, s, tag, state):
"""
Add the string `s` to the result list, tagging its contents
with tag `tag`. Any lines that go beyond `self.linelen` will
be line-wrapped. If the total number of lines exceeds
`self.maxlines`, then raise a `_Maxlines` exception.
"""
# Make sure the string is unicode.
if isinstance(s, str):
s = decode_with_backslashreplace(s)
# Split the string into segments. The first segment is the
# content to add to the current line, and the remaining
# segments are new lines.
segments = s.split('\n')
for i, segment in enumerate(segments):
# If this isn't the first segment, then add a newline to
# split it from the previous segment.
if i > 0:
if (state.lineno+1) > self.maxlines:
raise _Maxlines()
if not state.linebreakok:
raise _Linebreak()
state.result.append(u'\n')
state.lineno += 1
state.charpos = 0
# If the segment fits on the current line, then just call
# markup to tag it, and store the result.
if state.charpos + len(segment) <= self.linelen:
state.charpos += len(segment)
if tag:
segment = Element('code', segment, style=tag)
state.result.append(segment)
# If the segment doesn't fit on the current line, then
# line-wrap it, and insert the remainder of the line into
# the segments list that we're iterating over. (We'll go
# the the beginning of the next line at the start of the
# next iteration through the loop.)
else:
split = self.linelen-state.charpos
segments.insert(i+1, segment[split:])
segment = segment[:split]
if tag:
segment = Element('code', segment, style=tag)
state.result += [segment, self.LINEWRAP]
|