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#!/usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2006-2010 (ita)
"""
Dumb C/C++ preprocessor for finding dependencies
It will look at all include files it can find after removing the comments, so the following
will always add the dependency on both "a.h" and "b.h"::
#include "a.h"
#ifdef B
#include "b.h"
#endif
int main() {
return 0;
}
To use::
def configure(conf):
conf.load('compiler_c')
conf.load('c_dumbpreproc')
"""
import re
from waflib.Tools import c_preproc
re_inc = re.compile(
'^[ \t]*(#|%:)[ \t]*(include)[ \t]*[<"](.*)[>"]\r*$',
re.IGNORECASE | re.MULTILINE)
def lines_includes(node):
code = node.read()
if c_preproc.use_trigraphs:
for (a, b) in c_preproc.trig_def:
code = code.split(a).join(b)
code = c_preproc.re_nl.sub('', code)
code = c_preproc.re_cpp.sub(c_preproc.repl, code)
return [(m.group(2), m.group(3)) for m in re.finditer(re_inc, code)]
parser = c_preproc.c_parser
class dumb_parser(parser):
def addlines(self, node):
if node in self.nodes[:-1]:
return
self.currentnode_stack.append(node.parent)
# Avoid reading the same files again
try:
lines = self.parse_cache[node]
except KeyError:
lines = self.parse_cache[node] = lines_includes(node)
self.lines = lines + [(c_preproc.POPFILE, '')] + self.lines
def start(self, node, env):
try:
self.parse_cache = node.ctx.parse_cache
except AttributeError:
self.parse_cache = node.ctx.parse_cache = {}
self.addlines(node)
while self.lines:
(x, y) = self.lines.pop(0)
if x == c_preproc.POPFILE:
self.currentnode_stack.pop()
continue
self.tryfind(y, env=env)
c_preproc.c_parser = dumb_parser
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