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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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 android.databinding.tool;
import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.BaseErrorListener;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.ParserRuleContext;
import org.antlr.v4.runtime.RecognitionException;
import org.antlr.v4.runtime.Recognizer;
import org.antlr.v4.runtime.Token;
import org.antlr.v4.runtime.tree.ErrorNode;
import org.antlr.v4.runtime.tree.ParseTreeListener;
import org.antlr.v4.runtime.tree.TerminalNode;
import android.databinding.parser.BindingExpressionLexer;
import android.databinding.parser.BindingExpressionParser;
import android.databinding.tool.expr.Expr;
import android.databinding.tool.expr.ExprModel;
import android.databinding.tool.processing.ErrorMessages;
import android.databinding.tool.store.Location;
import android.databinding.tool.util.L;
import android.databinding.tool.util.Preconditions;
import com.android.annotations.Nullable;
import java.util.ArrayList;
import java.util.List;
public class ExpressionParser {
final ExprModel mModel;
final ExpressionVisitor visitor;
public ExpressionParser(ExprModel model) {
mModel = model;
visitor = new ExpressionVisitor(mModel);
}
public Expr parse(String input, @Nullable Location locationInFile) {
ANTLRInputStream inputStream = new ANTLRInputStream(input);
BindingExpressionLexer lexer = new BindingExpressionLexer(inputStream);
CommonTokenStream tokenStream = new CommonTokenStream(lexer);
final BindingExpressionParser parser = new BindingExpressionParser(tokenStream);
parser.addErrorListener(new BaseErrorListener() {
@Override
public void syntaxError(Recognizer<?, ?> recognizer, Object offendingSymbol, int line,
int charPositionInLine, String msg, RecognitionException e) {
L.e(ErrorMessages.SYNTAX_ERROR, msg);
}
});
BindingExpressionParser.BindingSyntaxContext root = parser.bindingSyntax();
try {
mModel.setCurrentLocationInFile(locationInFile);
visitor.setParseTreeListener(new ParseTreeListener() {
List<ParserRuleContext> mStack = new ArrayList<ParserRuleContext>();
@Override
public void visitTerminal(TerminalNode node) {
}
@Override
public void visitErrorNode(ErrorNode node) {
}
@Override
public void enterEveryRule(ParserRuleContext ctx) {
mStack.add(ctx);
mModel.setCurrentParserContext(ctx);
}
@Override
public void exitEveryRule(ParserRuleContext ctx) {
Preconditions.check(ctx == mStack.get(mStack.size() - 1),
"Inconsistent exit from context. Received %s, expecting %s",
ctx.toInfoString(parser),
mStack.get(mStack.size() - 1).toInfoString(parser));
mStack.remove(mStack.size() - 1);
if (mStack.size() > 0) {
mModel.setCurrentParserContext(mStack.get(mStack.size() - 1));
} else {
mModel.setCurrentParserContext(null);
}
}
});
return root.accept(visitor);
} finally {
mModel.setCurrentLocationInFile(null);
}
}
public ExprModel getModel() {
return mModel;
}
}
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