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// Copyright 2011 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "depfile_parser.h"
// A note on backslashes in Makefiles, from reading the docs:
// Backslash-newline is the line continuation character.
// Backslash-# escapes a # (otherwise meaningful as a comment start).
// Backslash-% escapes a % (otherwise meaningful as a special).
// Finally, quoting the GNU manual, "Backslashes that are not in danger
// of quoting ‘%’ characters go unmolested."
// How do you end a line with a backslash? The netbsd Make docs suggest
// reading the result of a shell command echoing a backslash!
//
// Rather than implement the above, we do the simpler thing here.
// If anyone actually has depfiles that rely on the more complicated
// behavior we can adjust this.
bool DepfileParser::Parse(const string& content, string* err) {
const char* p = content.data();
const char* end = content.data() + content.size();
for (;;) {
const char* start = p;
char yych;
/*!re2c
re2c:define:YYCTYPE = "const char";
re2c:define:YYCURSOR = p;
re2c:define:YYMARKER = q;
re2c:define:YYLIMIT = end;
re2c:yyfill:parameter = 0;
re2c:define:YYFILL = break;
re2c:indent:top = 2;
re2c:indent:string = " ";
re2c:yych:emit = 0;
'\\\n' { continue; }
[ \n]* { continue; }
[a-zA-Z0-9+,/\\_:.-]+ {
// Got a filename.
int len = p - start;;
if (start[len - 1] == ':')
len--; // Strip off trailing colon, if any.
if (len == 0)
continue; // Drop isolated colons.
if (!out_.str_) {
out_ = StringPiece(start, len);
} else {
ins_.push_back(StringPiece(start, len));
}
continue;
}
[^] {
*err = "BUG: depfile lexer encountered unknown state";
return false;
}
*/
}
return true;
}
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