use re2c to parse depfiles

1 files changed, 55 insertions, 0 deletions

diff --git a/src/depfile_parser.in.cc b/src/depfile_parser.in.cc
new file mode 100644
index 0000000..1e22ca9
--- /dev/null
+++ b/src/depfile_parser.in.cc
@@ -0,0 +1,55 @@
+// 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"
+
+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.
+      if (p[-1] == ':') {
+        out_ = StringPiece(start, p - start - 1);
+      } else {
+        ins_.push_back(StringPiece(start, p - start));
+      }
+      continue;
+    }
+    [^] {
+      *err = "BUG: depfile lexer encountered unknown state";
+      return false;
+    }
+    */
+  }
+  return true;
+}