blob: 80e7aec51514908f6df77840abeb0efee22628da [file] [log] [blame]
// Copyright 2018 The Bazel Authors. 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.
package com.google.devtools.build.lib.includescanning;
import com.google.common.base.CharMatcher;
import com.google.devtools.build.lib.includescanning.IncludeParser.Inclusion.Kind;
/** Parses swig files and extracts their includes (%include / %extern / %import). */
class SwigIncludeParser extends IncludeParser {
SwigIncludeParser() {
// There are no preprocessor-macro hints for swig.
super(/* hints= */ null);
}
private static int skipParentheses(char[] chars, int pos, int end) {
// TODO(bazel-team): In theory this could be multiline, but the include scanner currently works
// on a single line.
int openedParentheses = 1;
if (pos >= end || chars[pos] != '(') {
return pos;
}
pos++;
while (openedParentheses > 0 && pos < end) {
if (chars[pos] == '(') {
openedParentheses++;
} else if (chars[pos] == ')') {
openedParentheses--;
}
pos++;
}
return pos;
}
@Override
/** See javadoc for {@link IncludeParser#getFileType()} */
protected GrepIncludesFileType getFileType() {
return GrepIncludesFileType.SWIG;
}
@Override
protected IncludesKeywordData expectIncludeKeyword(char[] chars, int pos, int end) {
int start = skipWhitespace(chars, pos, end);
if ((pos = expect(chars, start, end, "%include")) == -1
&& (pos = expect(chars, start, end, "%extern")) == -1
&& (pos = expect(chars, start, end, "%import")) == -1) {
return IncludesKeywordData.NONE;
}
int npos = skipWhitespace(chars, pos, end);
npos = skipParentheses(chars, npos, end);
npos = skipWhitespace(chars, npos, end);
if (npos > pos) {
return IncludesKeywordData.importOrSwig(npos);
}
return IncludesKeywordData.NONE;
}
@Override
protected boolean isValidInclusionKind(Kind kind) {
return !kind.isNext();
}
@Override
protected Inclusion createOtherInclusion(String inclusionContent) {
if (inclusionContent.startsWith("/")) {
return null; // Ignore absolute path names.
}
// Truncate comments after filename.
int index = inclusionContent.indexOf("//");
if (index > 0) {
inclusionContent = inclusionContent.substring(0, index);
}
index = inclusionContent.indexOf("/*");
if (index > 0) {
inclusionContent = inclusionContent.substring(0, index);
}
// Trim whitespace.
inclusionContent = CharMatcher.whitespace().trimFrom(inclusionContent);
// Treat swig inclusions w/o quotes or angle brackets as quoted inclusions.
return inclusionContent.length() > 0 ? new Inclusion(inclusionContent, Kind.QUOTE) : null;
}
}