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/*******************************************************************************
* Copyright (c) 2009, 2022 Mountainminds GmbH & Co. KG and Contributors
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.test.validation;
import java.io.IOException;
import java.io.StreamTokenizer;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;
/**
* Simple parser for Java like method invocation statements. For example:
*
* <pre>
* foo("BAR", 42)
* </pre>
*
* Method parameters can only be String or int literals.
*/
class StatementParser {
/**
* Call-back interface for parsed statements.
*/
public interface IStatementVisitor {
/**
* Called when a method invocation has been paresed.
*
* @param ctx
* context information for error messages
* @param name
* local method name
* @param args
* argument values
*/
void visitInvocation(String ctx, String name, Object... args);
}
/**
* Parses the given source.
*
* @param source
* source string to parse
* @param visitor
* visitor to emit parsed statements
* @param ctx
* context information to include in error messages
*/
public static void parse(String source, IStatementVisitor visitor,
String ctx) throws IOException {
new StatementParser(source, visitor, ctx).parse();
}
private final IStatementVisitor visitor;
private final StreamTokenizer tokenizer;
private final String ctx;
private StatementParser(String source, IStatementVisitor visitor,
String ctx) {
this.visitor = visitor;
this.ctx = ctx;
tokenizer = new StreamTokenizer(new StringReader(source));
tokenizer.resetSyntax();
tokenizer.whitespaceChars(' ', ' ');
tokenizer.whitespaceChars('\t', '\t');
tokenizer.wordChars('a', 'z');
tokenizer.wordChars('A', 'Z');
tokenizer.quoteChar('"');
tokenizer.parseNumbers();
}
private void parse() throws IOException {
while (!accept(StreamTokenizer.TT_EOF)) {
invocation();
}
}
private void invocation() throws IOException {
final String name = expect(StreamTokenizer.TT_WORD).sval;
final List<Object> args = new ArrayList<Object>();
expect('(');
if (!accept(')')) {
args.add(argument());
while (!accept(')')) {
expect(',');
args.add(argument());
}
}
visitor.visitInvocation(ctx, name, args.toArray());
}
private Object argument() throws IOException {
if (accept(StreamTokenizer.TT_NUMBER)) {
return Integer.valueOf((int) tokenizer.nval);
}
if (accept('"')) {
return tokenizer.sval;
}
throw syntaxError();
}
private boolean accept(final int type) throws IOException {
final boolean match = tokenizer.nextToken() == type;
if (!match) {
tokenizer.pushBack();
}
return match;
}
private StreamTokenizer expect(final int type) throws IOException {
if (tokenizer.nextToken() != type) {
throw syntaxError();
}
return tokenizer;
}
private IOException syntaxError() {
return new IOException("Invalid syntax (" + ctx + ")");
}
}
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