/*
* Copyright (C) 2012 Facebook, Inc.
*
* 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.facebook.swift.parser;
import com.facebook.swift.parser.antlr.DocumentGenerator;
import com.facebook.swift.parser.antlr.ThriftLexer;
import com.facebook.swift.parser.antlr.ThriftParser;
import com.facebook.swift.parser.model.Document;
import com.google.common.io.InputSupplier;
import org.antlr.runtime.ANTLRReaderStream;
import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.RecognitionException;
import org.antlr.runtime.tree.BufferedTreeNodeStream;
import org.antlr.runtime.tree.Tree;
import org.antlr.runtime.tree.TreeNodeStream;
import java.io.IOException;
import java.io.Reader;
public class ThriftIdlParser
{
public static Document parseThriftIdl(InputSupplier<? extends Reader> input)
throws IOException
{
Tree tree = parseTree(input);
TreeNodeStream stream = new BufferedTreeNodeStream(tree);
DocumentGenerator generator = new DocumentGenerator(stream);
try {
return generator.document().value;
}
catch (RecognitionException e) {
throw new IllegalArgumentException(e);
}
}
static Tree parseTree(InputSupplier<? extends Reader> input)
throws IOException
{
try (Reader reader = input.getInput()) {
ThriftLexer lexer = new ThriftLexer(new ANTLRReaderStream(reader));
ThriftParser parser = new ThriftParser(new CommonTokenStream(lexer));
try {
Tree tree = (Tree) parser.document().getTree();
if (parser.getNumberOfSyntaxErrors() > 0) {
throw new IllegalArgumentException("syntax error");
}
return tree;
}
catch (RecognitionException e) {
throw new IllegalArgumentException(e);
}
}
}
}