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
|
from __future__ import print_function
from __future__ import unicode_literals
import re
import sys
from cmakelang import common
# NOTE(josh): inspiration and some bits taken from cmakeast_ and
# cmakelistparsing_
#
# .. _cmake_ast: https://github.com/polysquare/cmake-ast
# .. _cmakelist_parsing: https://github.com/ijt/cmakelists_parsing
class TokenType(common.EnumObject):
_id_map = {}
TokenType.QUOTED_LITERAL = TokenType(0)
TokenType.LEFT_PAREN = TokenType(1)
TokenType.RIGHT_PAREN = TokenType(2)
TokenType.WORD = TokenType(3)
TokenType.NUMBER = TokenType(4)
TokenType.DEREF = TokenType(5)
TokenType.WHITESPACE = TokenType(6)
TokenType.NEWLINE = TokenType(7)
TokenType.COMMENT = TokenType(8)
TokenType.UNQUOTED_LITERAL = TokenType(9)
TokenType.FORMAT_OFF = TokenType(10)
TokenType.FORMAT_ON = TokenType(11)
TokenType.BRACKET_ARGUMENT = TokenType(12)
TokenType.BRACKET_COMMENT = TokenType(13)
TokenType.BYTEORDER_MARK = TokenType(14)
TokenType.ATWORD = TokenType(15)
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(type={0}, "
"content={1}, "
"line={2}, "
"col={3})").format(self.type.name, repr(self.spelling), *self.begin)
def tokenize(contents):
"""
Scan a string and return a list of Token objects representing the contents
of the cmake listfile.
"""
# https://cmake.org/cmake/help/v3.0/manual/
# cmake-language.7.html#grammar-token-unquoted_legacy
legacy_pattern = "({})+".format(
"|".join([
# Make-style variable like $(MAKE)
r'(\$\([^\$\(\)]+\))',
# Quoted-substring
r'("[^"\\]*(?:\\.[^"\\]*)*")',
# Any element except whitespace or one of '()#"\'
r'([^\s\(\)#"\\])',
# Escape sequences
# https://cmake.org/cmake/help/v3.0/manual/
# cmake-language.7.html#grammar-token-escape_sequence
r'(\\[\(\)#" \\\$@^trn;])'
])
)
# https://cmake.org/cmake/help/v3.0/manual/
# cmake-language.7.html#unquoted-argument
unquoted_pattern = "({})+".format(
"|".join([
# Any element except whitespace or one of '()#"\'
r'([^\s\(\)#"\\])',
# Escape sequences
# https://cmake.org/cmake/help/v3.0/manual/
# cmake-language.7.html#grammar-token-escape_sequence
r'(\\[\(\)#" \\\$@^trn;])'
])
)
# Regexes are in priority order. Changing the order may alter the
# behavior of the lexer
scanner = re.Scanner([
# double quoted string
# NOTE(josh): regex borrowed from
# https://stackoverflow.com/a/37379449/141023
(r'(?<![^\s\(])"[^"\\]*(?:\\.[^"\\]*)*"(?![^\s\)])',
lambda s, t: (TokenType.QUOTED_LITERAL, t)),
# single quoted string
(r"(?<![^\s\(])'[^'\\]*(?:\\.[^'\\]*)*'(?![^\s\)])",
lambda s, t: (TokenType.QUOTED_LITERAL, t)),
# bracket argument
(r"(?<![^\s\(])\[(=*)\[.*?\]\1\](?![^\s\)])",
lambda s, t: (TokenType.BRACKET_ARGUMENT, t)),
(r"(?<![^\s\(])-?[0-9]+(?![^\s\)\(])",
lambda s, t: (TokenType.NUMBER, t)),
# Either a valid function name or variable name.
(r"(?<![^\s\(])[a-zA-z_][a-zA-Z0-9_]*(?![^\s\)\(])",
lambda s, t: (TokenType.WORD, t)),
# A configure_file replacement @<word>@
# Either a valid function name or variable name.
(r"(?<![^\s\(])@[a-zA-z_][a-zA-Z0-9_]*@(?![^\s\)\(])",
lambda s, t: (TokenType.ATWORD, t)),
# A variable dereference ${<word>}
(r"(?<![^\s\(])\${[a-zA-z_][a-zA-Z0-9_]*}(?![^\s\)])",
lambda s, t: (TokenType.DEREF, t)),
# unquoted_legacy
(legacy_pattern,
lambda s, t: (TokenType.UNQUOTED_LITERAL, t)),
# unquoted_element+
(unquoted_pattern,
lambda s, t: (TokenType.UNQUOTED_LITERAL, t)),
(r"\(", lambda s, t: (TokenType.LEFT_PAREN, t)),
(r"\)", lambda s, t: (TokenType.RIGHT_PAREN, t)),
# NOTE(josh): bare carriage returns are very unlikely to be used but
# just for the case of explicitnes, if we ever encounter any we treat
# it as a newline
(r"\r?\n", lambda s, t: (TokenType.NEWLINE, t)),
(r"\r\n?", lambda s, t: (TokenType.NEWLINE, t)),
# NOTE(josh): don't match '\s' here or we'll miss some newline tokens
# TODO(josh): should we match unicode whitespace too?
(r"[ \t\f\v]+", lambda s, t: (TokenType.WHITESPACE, t)),
(r"#\s*(cmake-format|cmf): off[^\n]*",
lambda s, t: (TokenType.FORMAT_OFF, t)),
(r"#\s*(cmake-format|cmf): on[^\n]*",
lambda s, t: (TokenType.FORMAT_ON, t)),
# bracket comment
(r"#\[(=*)\[.*?\]\1\]", lambda s, t: (TokenType.BRACKET_COMMENT, t)),
# line comment
(r"#[^\n]*", lambda s, t: (TokenType.COMMENT, t)),
# Catch-all for literals which are compound statements.
(r"([^\s\(\)]+|[^\s\(]*[^\)]|[^\(][^\s\)]*)",
lambda s, t: (TokenType.UNQUOTED_LITERAL, t)),
], re.DOTALL)
tokens_return = []
if contents.startswith("\ufeff"):
tokens_return = [
Token(tok_type=TokenType.BYTEORDER_MARK,
spelling=contents[0],
index=-1,
begin=SourceLocation((0, 0, 0)),
end=SourceLocation((0, 0, 0)))]
contents = contents[1:]
tokens, remainder = scanner.scan(contents)
# 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
for tok_index, (tok_type, spelling) in enumerate(tokens):
if sys.version_info[0] < 3:
assert isinstance(spelling, unicode)
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))))
if remainder:
raise common.UserError(
"Lexer Error: failed to tokenize input starting at: {}:{} with:\n {}"
.format(lineno, col, remainder[:-20]))
return tokens_return
def parse_bracket_argument(text):
regex = re.compile(r'^\[(=*)\[(.*)\]\1\]$', re.DOTALL)
match = regex.match(text)
assert match, "Failed to match bracket argument pattern in {}".format(text)
return ('[' + match.group(1) + '[',
match.group(2),
']' + match.group(1) + ']')
def parse_bracket_comment(text):
prefix, content, suffix = parse_bracket_argument(text[1:])
return ('#' + prefix, content, suffix)
def get_first_non_whitespace_token(tokens):
"""
Return the first token in the list that is not whitespace, or None
"""
for token in tokens:
if token.type not in (TokenType.WHITESPACE, TokenType.NEWLINE):
return token
return None
|
