1 /* Generated by re2c 0.13.5 */
2 // Copyright 2011 Google Inc. All Rights Reserved.
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
8 // http://www.apache.org/licenses/LICENSE-2.0
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
16 #include "depfile_parser.h"
18 // A note on backslashes in Makefiles, from reading the docs:
19 // Backslash-newline is the line continuation character.
20 // Backslash-# escapes a # (otherwise meaningful as a comment start).
21 // Backslash-% escapes a % (otherwise meaningful as a special).
22 // Finally, quoting the GNU manual, "Backslashes that are not in danger
23 // of quoting ‘%’ characters go unmolested."
24 // How do you end a line with a backslash? The netbsd Make docs suggest
25 // reading the result of a shell command echoing a backslash!
27 // Rather than implement all of above, we do a simpler thing here:
28 // Backslashes escape a set of characters (see "escapes" defined below),
29 // otherwise they are passed through verbatim.
30 // If anyone actually has depfiles that rely on the more complicated
31 // behavior we can adjust this.
32 bool DepfileParser::Parse(string* content, string* err) {
33 // in: current parser input point.
35 // parsing_targets: whether we are parsing targets or dependencies.
36 char* in = &(*content)[0];
37 char* end = in + content->size();
38 bool parsing_targets = true;
40 // out: current output point (typically same as in, but can fall behind
41 // as we de-escape backslashes).
43 // filename: start of the current parsed filename.
46 // start: beginning of the current parsed span.
47 const char* start = in;
51 static const unsigned char yybm[] = {
52 0, 0, 0, 0, 0, 0, 0, 0,
53 0, 0, 0, 0, 0, 0, 0, 0,
54 0, 0, 0, 0, 0, 0, 0, 0,
55 0, 0, 0, 0, 0, 0, 0, 0,
56 0, 128, 0, 0, 0, 0, 0, 0,
57 128, 128, 0, 128, 128, 128, 128, 128,
58 128, 128, 128, 128, 128, 128, 128, 128,
59 128, 128, 128, 0, 0, 128, 0, 0,
60 128, 128, 128, 128, 128, 128, 128, 128,
61 128, 128, 128, 128, 128, 128, 128, 128,
62 128, 128, 128, 128, 128, 128, 128, 128,
63 128, 128, 128, 0, 0, 0, 0, 128,
64 0, 128, 128, 128, 128, 128, 128, 128,
65 128, 128, 128, 128, 128, 128, 128, 128,
66 128, 128, 128, 128, 128, 128, 128, 128,
67 128, 128, 128, 128, 0, 128, 128, 0,
68 128, 128, 128, 128, 128, 128, 128, 128,
69 128, 128, 128, 128, 128, 128, 128, 128,
70 128, 128, 128, 128, 128, 128, 128, 128,
71 128, 128, 128, 128, 128, 128, 128, 128,
72 128, 128, 128, 128, 128, 128, 128, 128,
73 128, 128, 128, 128, 128, 128, 128, 128,
74 128, 128, 128, 128, 128, 128, 128, 128,
75 128, 128, 128, 128, 128, 128, 128, 128,
76 128, 128, 128, 128, 128, 128, 128, 128,
77 128, 128, 128, 128, 128, 128, 128, 128,
78 128, 128, 128, 128, 128, 128, 128, 128,
79 128, 128, 128, 128, 128, 128, 128, 128,
80 128, 128, 128, 128, 128, 128, 128, 128,
81 128, 128, 128, 128, 128, 128, 128, 128,
82 128, 128, 128, 128, 128, 128, 128, 128,
83 128, 128, 128, 128, 128, 128, 128, 128,
90 if (yych <= 0x00) goto yy7;
93 if (yych <= '!') goto yy5;
94 if (yych <= '#') goto yy9;
99 if (yych <= '\'') goto yy9;
100 if (yych <= ')') goto yy5;
103 if (yych <= ':') goto yy5;
104 if (yych <= '<') goto yy9;
111 if (yych <= '?') goto yy9;
112 if (yych <= 'Z') goto yy5;
115 if (yych <= '\\') goto yy2;
116 if (yych <= '^') goto yy9;
121 if (yych <= '`') goto yy9;
122 if (yych <= '{') goto yy5;
125 if (yych == 0x7F) goto yy9;
132 if ((yych = *in) <= '"') {
134 if (yych <= 0x00) goto yy3;
135 if (yych != '\n') goto yy14;
137 if (yych <= '\r') goto yy3;
138 if (yych == ' ') goto yy16;
143 if (yych <= '#') goto yy16;
144 if (yych == '*') goto yy16;
147 if (yych <= '\\') goto yy16;
148 if (yych == '|') goto yy16;
154 // For any other character (e.g. whitespace), swallow it here,
155 // allowing the outer logic to loop around again.
160 if (yych == '$') goto yy12;
168 // Got a span of plain text.
169 int len = (int)(in - start);
170 // Need to shift it over if we're overwriting backslashes.
172 memmove(out, start, len);
188 if (yybm[0+yych] & 128) {
195 // De-escape dollar character.
202 // Let backslash before other characters through verbatim.
210 // De-escape backslashed character.
218 int len = (int)(out - filename);
219 const bool is_target = parsing_targets;
220 if (len > 0 && filename[len - 1] == ':') {
221 len--; // Strip off trailing colon, if any.
222 parsing_targets = false;
229 ins_.push_back(StringPiece(filename, len));
230 } else if (!out_.str_) {
231 out_ = StringPiece(filename, len);
232 } else if (out_ != StringPiece(filename, len)) {
233 *err = "depfile has multiple output paths";
237 if (parsing_targets) {
238 *err = "expected ':' in depfile";