/* * 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.CommonTokenStream; import org.antlr.v4.runtime.ParserRuleContext; import org.antlr.v4.runtime.misc.Nullable; 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.store.Location; import android.databinding.tool.util.L; import android.databinding.tool.util.Preconditions; 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); BindingExpressionParser.BindingSyntaxContext root = parser.bindingSyntax(); try { mModel.setCurrentLocationInFile(locationInFile); visitor.setParseTreeListener(new ParseTreeListener() { List mStack = new ArrayList(); @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; } }