/usr/lib/python2.7/dist-packages/sphinx/pycode/pgen2/driver.py is in python-sphinx 1.4.9-2.
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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 | # Copyright 2004-2005 Elemental Security, Inc. All Rights Reserved.
# Licensed to PSF under a Contributor Agreement.
# Modifications:
# Copyright 2006 Google, Inc. All Rights Reserved.
# Licensed to PSF under a Contributor Agreement.
"""Parser driver.
This provides a high-level interface to parse a file into a syntax tree.
"""
__author__ = "Guido van Rossum <guido@python.org>"
__all__ = ["Driver", "load_grammar"]
# Python imports
import os
import logging
import sphinx
# Pgen imports
from sphinx.pycode.pgen2 import grammar, parse, token, tokenize, pgen
class Driver(object):
def __init__(self, grammar, convert=None, logger=None):
self.grammar = grammar
if logger is None:
logger = logging.getLogger()
self.logger = logger
self.convert = convert
def parse_tokens(self, tokens, debug=False):
"""Parse a series of tokens and return the syntax tree."""
# X X X Move the prefix computation into a wrapper around tokenize.
p = parse.Parser(self.grammar, self.convert)
p.setup()
lineno = 1
column = 0
type = value = start = end = line_text = None
prefix = ""
opmap = grammar.opmap
for type, value, start, end, line_text in tokens:
if start != (lineno, column):
assert (lineno, column) <= start, ((lineno, column), start)
s_lineno, s_column = start
if lineno < s_lineno:
prefix += "\n" * (s_lineno - lineno)
lineno = s_lineno
column = 0
if column < s_column:
prefix += line_text[column:s_column]
column = s_column
if type in (tokenize.COMMENT, tokenize.NL):
prefix += value
lineno, column = end
if value.endswith("\n"):
lineno += 1
column = 0
continue
if type == token.OP:
type = opmap[value]
# if debug:
# self.logger.debug("%s %r (prefix=%r)",
# token.tok_name[type], value, prefix)
if p.addtoken(type, value, (prefix, start)):
# if debug:
# self.logger.debug("Stop.")
break
prefix = ""
lineno, column = end
if value.endswith("\n"):
lineno += 1
column = 0
else:
# We never broke out -- EOF is too soon (how can this happen???)
raise parse.ParseError("incomplete input", type, value, line_text)
return p.rootnode
def parse_stream_raw(self, stream, debug=False):
"""Parse a stream and return the syntax tree."""
tokens = tokenize.generate_tokens(stream.readline)
return self.parse_tokens(tokens, debug)
def parse_stream(self, stream, debug=False):
"""Parse a stream and return the syntax tree."""
return self.parse_stream_raw(stream, debug)
def parse_file(self, filename, debug=False):
"""Parse a file and return the syntax tree."""
stream = open(filename)
try:
return self.parse_stream(stream, debug)
finally:
stream.close()
def parse_string(self, text, debug=False):
"""Parse a string and return the syntax tree."""
tokens = tokenize.generate_tokens(generate_lines(text).next)
return self.parse_tokens(tokens, debug)
def generate_lines(text):
"""Generator that behaves like readline without using StringIO."""
for line in text.splitlines(True):
yield line
while True:
yield ""
def load_grammar(gt="Grammar.txt", gp=None,
save=True, force=False, logger=None):
"""Load the grammar (maybe from a pickle)."""
if logger is None:
logger = logging.getLogger()
if gp is None:
head, tail = os.path.splitext(gt)
if tail == ".txt":
tail = ""
# embed Sphinx major version for the case we ever change the grammar...
gp = head + tail + "-sphinx" + \
".".join(map(str, sphinx.version_info[:2])) + ".pickle"
if force or not _newer(gp, gt):
logger.info("Generating grammar tables from %s", gt)
g = pgen.generate_grammar(gt)
if save:
logger.info("Writing grammar tables to %s", gp)
try:
g.dump(gp)
except IOError as e:
logger.info("Writing failed:"+str(e))
else:
g = grammar.Grammar()
g.load(gp)
return g
def _newer(a, b):
"""Inquire whether file a was written since file b."""
if not os.path.exists(a):
return False
if not os.path.exists(b):
return True
return os.path.getmtime(a) >= os.path.getmtime(b)
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