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
|
# MIT License
#
# Copyright The SCons Foundation
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"""Tool-specific initialization for lex.
There normally shouldn't be any need to import this module directly.
It will usually be imported through the generic SCons.Tool.Tool()
selection method.
"""
import os.path
import sys
import SCons.Action
import SCons.Tool
import SCons.Util
import SCons.Warnings
from SCons.Platform.mingw import MINGW_DEFAULT_PATHS
from SCons.Platform.cygwin import CYGWIN_DEFAULT_PATHS
from SCons.Platform.win32 import CHOCO_DEFAULT_PATH
LexAction = SCons.Action.Action("$LEXCOM", "$LEXCOMSTR")
if sys.platform == 'win32':
BINS = ['flex', 'lex', 'win_flex']
else:
BINS = ["flex", "lex"]
def lexEmitter(target, source, env):
sourceBase, sourceExt = os.path.splitext(SCons.Util.to_String(source[0]))
if sourceExt == ".lm": # If using Objective-C
target = [sourceBase + ".m"] # the extension is ".m".
# This emitter essentially tries to add to the target all extra
# files generated by flex.
# Different options that are used to trigger the creation of extra files.
fileGenOptions = ["--header-file=", "--tables-file="]
lexflags = env.subst("$LEXFLAGS", target=target, source=source)
for option in SCons.Util.CLVar(lexflags):
for fileGenOption in fileGenOptions:
l = len(fileGenOption)
if option[:l] == fileGenOption:
# A file generating option is present, so add the
# file name to the target list.
fileName = option[l:].strip()
target.append(fileName)
return (target, source)
def get_lex_path(env, append_paths=False):
"""
Find the path to the lex tool, searching several possible names
Only called in the Windows case, so the default_path
can be Windows-specific
:param env: current construction environment
:param append_paths: if set, add the path to the tool to PATH
:return: path to lex tool, if found
"""
for prog in BINS:
bin_path = SCons.Tool.find_program_path(
env,
prog,
default_paths=CHOCO_DEFAULT_PATH + MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS )
if bin_path:
if append_paths:
env.AppendENVPath('PATH', os.path.dirname(bin_path))
return bin_path
SCons.Warnings.warn(
SCons.Warnings.SConsWarning,
'lex tool requested, but lex or flex binary not found in ENV PATH'
)
def generate(env):
"""Add Builders and construction variables for lex to an Environment."""
c_file, cxx_file = SCons.Tool.createCFileBuilders(env)
# C
c_file.add_action(".l", LexAction)
c_file.add_emitter(".l", lexEmitter)
c_file.add_action(".lex", LexAction)
c_file.add_emitter(".lex", lexEmitter)
# Objective-C
cxx_file.add_action(".lm", LexAction)
cxx_file.add_emitter(".lm", lexEmitter)
# C++
cxx_file.add_action(".ll", LexAction)
cxx_file.add_emitter(".ll", lexEmitter)
env["LEXFLAGS"] = SCons.Util.CLVar("")
if sys.platform == 'win32':
# ignore the return - we do not need the full path here
_ = get_lex_path(env, append_paths=True)
env["LEX"] = env.Detect(BINS)
if not env.get("LEXUNISTD"):
env["LEXUNISTD"] = SCons.Util.CLVar("")
env["LEXCOM"] = "$LEX $LEXUNISTD $LEXFLAGS -t $SOURCES > $TARGET"
else:
env["LEX"] = env.Detect(BINS)
env["LEXCOM"] = "$LEX $LEXFLAGS -t $SOURCES > $TARGET"
def exists(env):
if sys.platform == 'win32':
return get_lex_path(env)
else:
return env.Detect(BINS)
# Local Variables:
# tab-width:4
# indent-tabs-mode:nil
# End:
# vim: set expandtab tabstop=4 shiftwidth=4:
|
