// Copyright 2012 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.
package com.google.collide.client.code.gotodefinition;
import com.google.collide.client.documentparser.AsyncParser;
import com.google.collide.client.documentparser.DocumentParser;
import com.google.collide.client.documentparser.ParseResult;
import com.google.collide.client.util.logging.Log;
import com.google.collide.codemirror2.Token;
import com.google.collide.codemirror2.TokenType;
import com.google.collide.codemirror2.XmlState;
import com.google.collide.json.shared.JsonArray;
import com.google.collide.shared.document.Line;
import com.google.collide.shared.document.LineInfo;
import com.google.collide.shared.document.Position;
import com.google.collide.shared.util.ListenerRegistrar;
import com.google.collide.shared.util.StringUtils;
/**
* Extracts anchor tags with names using document parser, asynchronously.
*/
public class AnchorTagParser extends AsyncParser<AnchorTagParser.AnchorTag> {
static class AnchorTag implements AsyncParser.LineAware {
private final int lineNumber;
private final int column;
private final String name;
AnchorTag(int lineNumber, int column, String name) {
this.lineNumber = lineNumber;
this.column = column;
this.name = name;
}
@Override
public int getLineNumber() {
return lineNumber;
}
public int getColumn() {
return column;
}
public String getName() {
return name;
}
}
private final ListenerRegistrar.Remover listenerRemover;
private final DocumentParser parser;
private JsonArray<AnchorTag> anchorTags;
private boolean inAnchorTag = false;
private boolean inNameAttribute = false;
/**
* Creates and registers anchor parser.
*/
public AnchorTagParser(DocumentParser parser) {
this.parser = parser;
listenerRemover = parser.getListenerRegistrar().add(this);
}
@Override
public void onParseLine(Line line, int lineNumber, JsonArray<Token> tokens) {
ParseResult<XmlState> parserState =
parser.getState(XmlState.class, new Position(new LineInfo(line, lineNumber), 0), null);
if (parserState != null && parserState.getState() != null
&& parserState.getState().getContext() != null
&& "a".equalsIgnoreCase(parserState.getState().getContext().getTagName())) {
inAnchorTag = true;
}
int tokenEndColumn = 0;
for (int i = 0, l = tokens.size() - 1; i < l; i++) {
Token token = tokens.get(i);
TokenType type = token.getType();
String value = token.getValue();
int tokenStartColumn = tokenEndColumn;
tokenEndColumn += value.length();
if (type == TokenType.TAG) {
if (">".equals(value) || "/>".equals(value)) {
inAnchorTag = false;
inNameAttribute = false;
} else if ("<a".equalsIgnoreCase(value)) {
inAnchorTag = true;
inNameAttribute = false;
}
continue;
} else if (inAnchorTag && type == TokenType.ATTRIBUTE
&& ("name".equals(value) || "id".equals(value))) {
inNameAttribute = true;
continue;
} else if (inNameAttribute && type == TokenType.STRING) {
int valueStartColumn = tokenStartColumn;
if (value.startsWith("\"") && value.endsWith("\"")) {
value = value.substring(1, value.length() - 1);
valueStartColumn++;
}
if (value.length() > 0 && !StringUtils.isNullOrWhitespace(value)) {
Log.debug(getClass(), "Found anchor tag with name \"" + value + "\" at ("
+ lineNumber + "," + valueStartColumn + ")");
addData(new AnchorTag(lineNumber, valueStartColumn, value));
}
}
}
}
@Override
protected void onAfterParse(JsonArray<AnchorTag> tags) {
anchorTags = tags;
}
public JsonArray<AnchorTag> getAnchorTags() {
return anchorTags;
}
/**
* Cleanup object.
*
* After cleanup is invoked this instance should never be used.
*/
@Override
public void cleanup() {
super.cleanup();
listenerRemover.remove();
}
}