| /* Generated by re2c 0.13.5 */ |
| // 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 all of above, we do a simpler thing here: |
| // Backslashes escape a set of characters (see "escapes" defined below), |
| // otherwise they are passed through verbatim. |
| // If anyone actually has depfiles that rely on the more complicated |
| // behavior we can adjust this. |
| bool DepfileParser::Parse(string* content, string* err) { |
| // in: current parser input point. |
| // end: end of input. |
| // parsing_targets: whether we are parsing targets or dependencies. |
| char* in = &(*content)[0]; |
| char* end = in + content->size(); |
| bool parsing_targets = true; |
| while (in < end) { |
| // out: current output point (typically same as in, but can fall behind |
| // as we de-escape backslashes). |
| char* out = in; |
| // filename: start of the current parsed filename. |
| char* filename = out; |
| for (;;) { |
| // start: beginning of the current parsed span. |
| const char* start = in; |
| |
| { |
| char yych; |
| static const unsigned char yybm[] = { |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 128, 0, 0, 0, 0, 0, 0, |
| 128, 128, 0, 128, 128, 128, 128, 128, |
| 128, 128, 128, 128, 128, 128, 128, 128, |
| 128, 128, 128, 0, 0, 128, 0, 0, |
| 128, 128, 128, 128, 128, 128, 128, 128, |
| 128, 128, 128, 128, 128, 128, 128, 128, |
| 128, 128, 128, 128, 128, 128, 128, 128, |
| 128, 128, 128, 0, 0, 0, 0, 128, |
| 0, 128, 128, 128, 128, 128, 128, 128, |
| 128, 128, 128, 128, 128, 128, 128, 128, |
| 128, 128, 128, 128, 128, 128, 128, 128, |
| 128, 128, 128, 128, 0, 128, 128, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| }; |
| |
| yych = *in; |
| if (yych <= '=') { |
| if (yych <= '$') { |
| if (yych <= ' ') { |
| if (yych <= 0x00) goto yy7; |
| goto yy9; |
| } else { |
| if (yych <= '!') goto yy5; |
| if (yych <= '#') goto yy9; |
| goto yy4; |
| } |
| } else { |
| if (yych <= '*') { |
| if (yych <= '\'') goto yy9; |
| if (yych <= ')') goto yy5; |
| goto yy9; |
| } else { |
| if (yych <= ':') goto yy5; |
| if (yych <= '<') goto yy9; |
| goto yy5; |
| } |
| } |
| } else { |
| if (yych <= '^') { |
| if (yych <= 'Z') { |
| if (yych <= '?') goto yy9; |
| goto yy5; |
| } else { |
| if (yych != '\\') goto yy9; |
| } |
| } else { |
| if (yych <= '{') { |
| if (yych == '`') goto yy9; |
| goto yy5; |
| } else { |
| if (yych <= '|') goto yy9; |
| if (yych <= '~') goto yy5; |
| goto yy9; |
| } |
| } |
| } |
| ++in; |
| if ((yych = *in) <= '"') { |
| if (yych <= '\f') { |
| if (yych <= 0x00) goto yy3; |
| if (yych != '\n') goto yy14; |
| } else { |
| if (yych <= '\r') goto yy3; |
| if (yych == ' ') goto yy16; |
| goto yy14; |
| } |
| } else { |
| if (yych <= 'Z') { |
| if (yych <= '#') goto yy16; |
| if (yych == '*') goto yy16; |
| goto yy14; |
| } else { |
| if (yych <= '\\') goto yy16; |
| if (yych == '|') goto yy16; |
| goto yy14; |
| } |
| } |
| yy3: |
| { |
| // For any other character (e.g. whitespace), swallow it here, |
| // allowing the outer logic to loop around again. |
| break; |
| } |
| yy4: |
| yych = *++in; |
| if (yych == '$') goto yy12; |
| goto yy3; |
| yy5: |
| ++in; |
| yych = *in; |
| goto yy11; |
| yy6: |
| { |
| // Got a span of plain text. |
| int len = (int)(in - start); |
| // Need to shift it over if we're overwriting backslashes. |
| if (out < start) |
| memmove(out, start, len); |
| out += len; |
| continue; |
| } |
| yy7: |
| ++in; |
| { |
| break; |
| } |
| yy9: |
| yych = *++in; |
| goto yy3; |
| yy10: |
| ++in; |
| yych = *in; |
| yy11: |
| if (yybm[0+yych] & 128) { |
| goto yy10; |
| } |
| goto yy6; |
| yy12: |
| ++in; |
| { |
| // De-escape dollar character. |
| *out++ = '$'; |
| continue; |
| } |
| yy14: |
| ++in; |
| { |
| // Let backslash before other characters through verbatim. |
| *out++ = '\\'; |
| *out++ = yych; |
| continue; |
| } |
| yy16: |
| ++in; |
| { |
| // De-escape backslashed character. |
| *out++ = yych; |
| continue; |
| } |
| } |
| |
| } |
| |
| int len = (int)(out - filename); |
| const bool is_target = parsing_targets; |
| if (len > 0 && filename[len - 1] == ':') { |
| len--; // Strip off trailing colon, if any. |
| parsing_targets = false; |
| } |
| |
| if (len == 0) |
| continue; |
| |
| if (!is_target) { |
| ins_.push_back(StringPiece(filename, len)); |
| } else if (!out_.str_) { |
| out_ = StringPiece(filename, len); |
| } else if (out_ != StringPiece(filename, len)) { |
| *err = "depfile has multiple output paths"; |
| return false; |
| } |
| } |
| return true; |
| } |
