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from __future__ import print_function
from __future__ import unicode_literals
import enum
import logging
import re
logger = logging.getLogger(__name__)
class TokenType(enum.IntEnum):
LSQ_BRACKET = 0
RSQ_BRACKET = 1
LA_BRACKET = 2
RA_BRACKET = 3
PIPE = 4
BIGNAME = 5
SMALLNAME = 6
ELLIPSIS = 7
WHITESPACE = 8
LPAREN = 9
RPAREN = 10
class SourceLocation(tuple):
"""
Named tuple of (line, col, offset)
"""
# def __init__(self, line, col, offset):
# super(SourceLocation, self).__init__((line, col, offset))
@property
def line(self):
return self[0]
@property
def col(self):
return self[1]
@property
def offset(self):
return self[2]
def __repr__(self):
return '{}:{}'.format(self.line, self.col)
class Token(object):
"""
Lexical unit of a listfile.
"""
def __init__(self, tok_type, spelling, index, begin, end):
self.type = tok_type
self.spelling = spelling
self.index = index
self.begin = begin
self.end = end
@property
def content(self):
return self.spelling
# TODO(josh): get rid of this? Is it used or did I accidentally add it when
# I meant to add get_location()? Or should this be a property?
def location(self):
return self.begin
def get_location(self):
return self.begin
def count_newlines(self):
return self.spelling.count('\n')
def __repr__(self):
"""A string representation of this token."""
return ("Token({0}{2}:{3} {1})").format(
repr(self.spelling), self.type.name, *self.begin)
def tokenize_inner(contents):
"""
Scan a string and return a list of Token objects representing the contents
of the cmake listfile.
"""
# Regexes are in priority order. Changing the order may alter the
# behavior of the lexer
scanner = re.Scanner([
# Optional group brackets
(r"\[", lambda s, t: (TokenType.LSQ_BRACKET, t)),
(r"\]", lambda s, t: (TokenType.RSQ_BRACKET, t)),
# Mandatory group brackets
("<", lambda s, t: (TokenType.LA_BRACKET, t)),
(">", lambda s, t: (TokenType.RA_BRACKET, t)),
# Parenthesis
(r"\(", lambda s, t: (TokenType.LPAREN, t)),
(r"\)", lambda s, t: (TokenType.RPAREN, t)),
# Pipe character
(r"\|", lambda s, t: (TokenType.PIPE, t)),
# uppercase name
(r"[A-Z0-9_]+", lambda s, t: (TokenType.BIGNAME, t)),
# lowercase name
(r"[a-z0-9_\-]+", lambda s, t: (TokenType.SMALLNAME, t)),
# ellipsis
(r"\.\.\.", lambda s, t: (TokenType.ELLIPSIS, t)),
# whitespace
(r"\s+", lambda s, t: (TokenType.WHITESPACE, t)),
], re.DOTALL)
tokens, remainder = scanner.scan(contents)
if remainder:
raise ValueError("Unparsed tokens: {}".format(remainder))
return tokens
def annotate_tokens(tokens):
"""
Add source location and index information to tokens
"""
# Now add line, column, and serial number to token objects. We get lineno
# by maintaining a running count of newline characters encountered among
# tokens so far, and column count by splitting the most recent token on
# it's right most newline. Note that line and numbers are 1-indexed to match
# up with editors but column numbers are zero indexed because its fun to be
# inconsistent.
lineno = 1
col = 0
offset = 0
tokens_return = []
for tok_index, (tok_type, spelling) in enumerate(tokens):
begin = SourceLocation((lineno, col, offset))
newlines = spelling.count('\n')
lineno += newlines
if newlines:
col = len(spelling.rsplit('\n', 1)[1])
else:
col += len(spelling)
offset += len(bytearray(spelling, 'utf-8'))
tokens_return.append(Token(
tok_type=tok_type,
spelling=spelling,
index=tok_index,
begin=begin,
end=SourceLocation((lineno, col, offset))
))
return tokens_return
def tokenize(content):
if "(" not in content or ")" not in content:
raise ValueError("Missing parenthesis")
tokens = tokenize_inner(content)
return annotate_tokens(tokens)
def main():
"""
Dump tokenized usage text for debugging
"""
import argparse
import io
import os
import sys
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('infile')
args = parser.parse_args()
infile_arg = args.infile
if args.infile == "-":
infile_arg = os.dup(sys.stdin.fileno())
with io.open(infile_arg, 'r') as infile:
tokens = tokenize(infile.read())
print('\n'.join(str(x) for x in tokens))
if __name__ == '__main__':
main()
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