/usr/lib/python2.7/dist-packages/chirp/pyPEG.py is in chirp 1:20170714-1.
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 | # YPL parser 1.5
# written by VB.
import re
import sys
import codecs
import exceptions
class keyword(unicode):
pass
class code(unicode):
pass
class ignore(object):
def __init__(self, regex_text, *args):
self.regex = re.compile(regex_text, *args)
class _and(object):
def __init__(self, something):
self.obj = something
class _not(_and):
pass
class Name(unicode):
def __init__(self, *args):
self.line = 0
self.file = u""
class Symbol(list):
def __init__(self, name, what):
self.__name__ = name
self.append(name)
self.what = what
self.append(what)
def __call__(self):
return self.what
def __unicode__(self):
return u'Symbol(' + repr(self.__name__) + ', ' + repr(self.what) + u')'
def __repr__(self):
return unicode(self)
word_regex = re.compile(ur"\w+")
rest_regex = re.compile(ur".*")
print_trace = False
def u(text):
if isinstance(text, exceptions.BaseException):
text = text.args[0]
if type(text) is unicode:
return text
if isinstance(text, str):
if sys.stdin.encoding:
return codecs.decode(text, sys.stdin.encoding)
else:
return codecs.decode(text, "utf-8")
return unicode(text)
def skip(skipper, text, skipWS, skipComments):
if skipWS:
t = text.lstrip()
else:
t = text
if skipComments:
try:
while True:
skip, t = skipper.parseLine(t, skipComments, [], skipWS, None)
if skipWS:
t = t.lstrip()
except:
pass
return t
class parser(object):
def __init__(self, another=False, p=False):
self.restlen = -1
if not(another):
self.skipper = parser(True, p)
self.skipper.packrat = p
else:
self.skipper = self
self.lines = None
self.textlen = 0
self.memory = {}
self.packrat = p
# parseLine():
# textline: text to parse
# pattern: pyPEG language description
# resultSoFar: parsing result so far (default: blank list [])
# skipWS: Flag if whitespace should be skipped (default: True)
# skipComments: Python functions returning pyPEG for matching comments
#
# returns: pyAST, textrest
#
# raises: SyntaxError(reason) if textline is detected not
# being in language described by pattern
#
# SyntaxError(reason) if pattern is an illegal
# language description
def parseLine(self, textline, pattern, resultSoFar=[],
skipWS=True, skipComments=None):
name = None
_textline = textline
_pattern = pattern
def R(result, text):
if __debug__:
if print_trace:
try:
if _pattern.__name__ != "comment":
sys.stderr.write(u"match: " +
_pattern.__name__ + u"\n")
except:
pass
if self.restlen == -1:
self.restlen = len(text)
else:
self.restlen = min(self.restlen, len(text))
res = resultSoFar
if name and result:
name.line = self.lineNo()
res.append(Symbol(name, result))
elif name:
name.line = self.lineNo()
res.append(Symbol(name, []))
elif result:
if isinstance(result, list):
res.extend(result)
else:
res.extend([result])
if self.packrat:
self.memory[(len(_textline), id(_pattern))] = (res, text)
return res, text
def syntaxError():
if self.packrat:
self.memory[(len(_textline), id(_pattern))] = False
raise SyntaxError()
if self.packrat:
try:
result = self.memory[(len(textline), id(pattern))]
if result:
return result
else:
raise SyntaxError()
except:
pass
if callable(pattern):
if __debug__:
if print_trace:
try:
if pattern.__name__ != "comment":
sys.stderr.write(u"testing with " +
pattern.__name__ + u": " +
textline[:40] + u"\n")
except:
pass
if pattern.__name__[0] != "_":
name = Name(pattern.__name__)
pattern = pattern()
if callable(pattern):
pattern = (pattern,)
text = skip(self.skipper, textline, skipWS, skipComments)
pattern_type = type(pattern)
if pattern_type is str or pattern_type is unicode:
if text[:len(pattern)] == pattern:
text = skip(self.skipper, text[len(pattern):],
skipWS, skipComments)
return R(None, text)
else:
syntaxError()
elif pattern_type is keyword:
m = word_regex.match(text)
if m:
if m.group(0) == pattern:
text = skip(self.skipper, text[len(pattern):],
skipWS, skipComments)
return R(None, text)
else:
syntaxError()
else:
syntaxError()
elif pattern_type is _not:
try:
r, t = self.parseLine(text, pattern.obj, [],
skipWS, skipComments)
except:
return resultSoFar, textline
syntaxError()
elif pattern_type is _and:
r, t = self.parseLine(text, pattern.obj, [], skipWS, skipComments)
return resultSoFar, textline
elif pattern_type is type(word_regex) or pattern_type is ignore:
if pattern_type is ignore:
pattern = pattern.regex
m = pattern.match(text)
if m:
text = skip(self.skipper, text[len(m.group(0)):],
skipWS, skipComments)
if pattern_type is ignore:
return R(None, text)
else:
return R(m.group(0), text)
else:
syntaxError()
elif pattern_type is tuple:
result = []
n = 1
for p in pattern:
if isinstance(p, int):
n = p
else:
if n > 0:
for i in range(n):
result, text = self.parseLine(
text, p, result, skipWS, skipComments)
elif n == 0:
if text == "":
pass
else:
try:
newResult, newText = self.parseLine(
text, p, result, skipWS, skipComments)
result, text = newResult, newText
except SyntaxError:
pass
elif n < 0:
found = False
while True:
try:
newResult, newText = self.parseLine(
text, p, result, skipWS, skipComments)
result, text, found = newResult, newText, True
except SyntaxError:
break
if n == -2 and not(found):
syntaxError()
n = 1
return R(result, text)
elif pattern_type is list:
result = []
found = False
for p in pattern:
try:
result, text = self.parseLine(text, p, result,
skipWS, skipComments)
found = True
except SyntaxError:
pass
if found:
break
if found:
return R(result, text)
else:
syntaxError()
else:
raise SyntaxError(u"illegal type in grammar: " + u(pattern_type))
def lineNo(self):
if not(self.lines):
return u""
if self.restlen == -1:
return u""
parsed = self.textlen - self.restlen
left, right = 0, len(self.lines)
while True:
mid = int((right + left) / 2)
if self.lines[mid][0] <= parsed:
try:
if self.lines[mid + 1][0] >= parsed:
try:
return u(self.lines[mid + 1][1]) + \
u":" + u(self.lines[mid + 1][2])
except:
return u""
else:
left = mid + 1
except:
try:
return u(self.lines[mid + 1][1]) + \
u":" + u(self.lines[mid + 1][2])
except:
return u""
else:
right = mid - 1
if left > right:
return u""
# plain module APIs
def parseLine(textline, pattern, resultSoFar=[], skipWS=True,
skipComments=None, packrat=False):
p = parser(p=packrat)
text = skip(p.skipper, textline, skipWS, skipComments)
ast, text = p.parseLine(text, pattern, resultSoFar, skipWS, skipComments)
return ast, text
# parse():
# language: pyPEG language description
# lineSource: a fileinput.FileInput object
# skipWS: Flag if whitespace should be skipped (default: True)
# skipComments: Python function which returns pyPEG for matching comments
# packrat: use memoization
# lineCount: add line number information to AST
#
# returns: pyAST
#
# raises: SyntaxError(reason), if a parsed line is not in language
# SyntaxError(reason), if the language description is illegal
def parse(language, lineSource, skipWS=True, skipComments=None,
packrat=False, lineCount=True):
lines, lineNo = [], 0
while callable(language):
language = language()
orig, ld = u"", 0
for line in lineSource:
if lineSource.isfirstline():
ld = 1
else:
ld += 1
lines.append((len(orig), lineSource.filename(),
lineSource.lineno() - 1))
orig += u(line)
textlen = len(orig)
try:
p = parser(p=packrat)
p.textlen = len(orig)
if lineCount:
p.lines = lines
else:
p.line = None
text = skip(p.skipper, orig, skipWS, skipComments)
result, text = p.parseLine(text, language, [], skipWS, skipComments)
if text:
raise SyntaxError()
except SyntaxError, msg:
parsed = textlen - p.restlen
textlen = 0
nn, lineNo, file = 0, 0, u""
for n, ld, l in lines:
if n >= parsed:
break
else:
lineNo = l
nn += 1
file = ld
lineNo += 1
nn -= 1
lineCont = orig.splitlines()[nn]
raise SyntaxError(u"syntax error in " + u(file) + u":" +
u(lineNo) + u": " + lineCont)
return result
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