/*
* Copyright 2009 The Closure Compiler Authors.
*
* 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.javascript.jscomp;
import com.google.common.base.Preconditions;
import com.google.javascript.jscomp.parsing.ParserRunner;
import com.google.javascript.rhino.IR;
import com.google.javascript.rhino.InputId;
import com.google.javascript.rhino.Node;
import java.io.IOException;
import java.util.logging.Logger;
/**
* Generates an AST for a JavaScript source file.
*
*/
public class JsAst implements SourceAst {
private static final Logger logger_ = Logger.getLogger(JsAst.class.getName());
private static final long serialVersionUID = 1L;
private transient InputId inputId;
private transient SourceFile sourceFile;
private String fileName;
private Node root;
public JsAst(SourceFile sourceFile) {
this.inputId = new InputId(sourceFile.getName());
this.sourceFile = sourceFile;
this.fileName = sourceFile.getName();
}
@Override
public Node getAstRoot(AbstractCompiler compiler) {
if (root == null) {
parse(compiler);
root.setInputId(inputId);
}
return root;
}
@Override
public void clearAst() {
root = null;
// While we're at it, clear out any saved text in the source file on
// the assumption that if we're dumping the parse tree, then we probably
// assume regenerating everything else is a smart idea also.
sourceFile.clearCachedSource();
}
@Override
public InputId getInputId() {
return inputId;
}
@Override
public SourceFile getSourceFile() {
return sourceFile;
}
@Override
public void setSourceFile(SourceFile file) {
Preconditions.checkState(fileName.equals(file.getName()));
sourceFile = file;
}
private void parse(AbstractCompiler compiler) {
int startErrorCount = compiler.getErrorManager().getErrorCount();
try {
ParserRunner.ParseResult result = ParserRunner.parse(
sourceFile,
sourceFile.getCode(),
compiler.getParserConfig(sourceFile.isExtern()
? AbstractCompiler.ConfigContext.EXTERNS
: AbstractCompiler.ConfigContext.DEFAULT),
compiler.getDefaultErrorReporter());
root = result.ast;
if (compiler.isIdeMode()) {
compiler.addComments(sourceFile.getName(), result.comments);
}
} catch (IOException e) {
compiler.report(
JSError.make(AbstractCompiler.READ_ERROR, sourceFile.getName()));
}
if (root == null ||
// Most passes try to report as many errors as possible,
// so there may already be errors. We only care if there were
// errors in the code we just parsed.
(compiler.getErrorManager().getErrorCount() > startErrorCount && !compiler.isIdeMode())) {
// There was a parse error or IOException, so use a dummy block.
root = IR.script();
} else {
compiler.prepareAst(root);
}
// Set the source name so that the compiler passes can track
// the source file and module.
root.setStaticSourceFile(sourceFile);
}
}