/* *******************************************************************
* Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
* All rights reserved.
* This program and the accompanying materials are made available
* under the terms of the Eclipse Public License v1.0
* which accompanies this distribution and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* PARC initial implementation
* ******************************************************************/
package org.aspectj.weaver.patterns;
import java.util.ArrayList;
import java.util.List;
import org.aspectj.weaver.BCException;
import org.aspectj.weaver.ISourceContext;
public class BasicTokenSource implements ITokenSource {
private int index = 0;
private IToken[] tokens;
private ISourceContext sourceContext;
public BasicTokenSource(IToken[] tokens, ISourceContext sourceContext) {
this.tokens = tokens;
this.sourceContext = sourceContext;
}
public int getIndex() {
return index;
}
public void setIndex(int newIndex) {
this.index = newIndex;
}
public IToken next() {
try {
return tokens[index++];
} catch (ArrayIndexOutOfBoundsException e) {
return IToken.EOF;
}
}
public IToken peek() {
try {
return tokens[index];
} catch (ArrayIndexOutOfBoundsException e) {
return IToken.EOF;
}
}
public IToken peek(int offset) {
try {
return tokens[index+offset];
} catch (ArrayIndexOutOfBoundsException e) {
return IToken.EOF;
}
}
public String toString() {
StringBuffer buf = new StringBuffer();
buf.append("[");
for (int i = 0; i < tokens.length; i++) {
IToken t = tokens[i];
if (t == null)
break;
if (i > 0)
buf.append(", ");
buf.append(t.toString());
}
buf.append("]");
return buf.toString();
}
//////////////////////////////////////////////////////
// Convenience, maybe just for testing
static ITokenSource makeTokenSource(String input, ISourceContext context) {
char[] chars = input.toCharArray();
int i = 0;
List tokens = new ArrayList();
while (i < chars.length) {
char ch = chars[i++];
switch(ch) {
case ' ':
case '\t':
case '\n':
case '\r':
continue;
case '*':
case '(':
case ')':
case '+':
case '[':
case ']':
case ',':
case '!':
case ':':
case '@':
case '<':
case '>':
case '=':
case '?':
tokens.add(BasicToken.makeOperator(makeString(ch), i-1, i-1));
continue;
case '.':
if ((i+2)<=chars.length) {
// could be '...'
char nextChar1 = chars[i];
char nextChar2 = chars[i+1];
if (ch==nextChar1 && ch==nextChar2) {
// '...'
tokens.add(BasicToken.makeIdentifier("...",i-1,i+1));
i=i+2;
} else {
tokens.add(BasicToken.makeOperator(makeString(ch), i-1, i-1));
}
} else {
tokens.add(BasicToken.makeOperator(makeString(ch), i-1, i-1));
}
continue;
case '&':
if ((i+1) <= chars.length && chars[i] != '&') {
tokens.add(BasicToken.makeOperator(makeString(ch),i-1,i-1));
continue;
}
// fall-through
case '|':
if (i == chars.length) {
throw new BCException("bad " + ch);
}
char nextChar = chars[i++];
if (nextChar == ch) {
tokens.add(BasicToken.makeOperator(makeString(ch, 2), i-2, i-1));
} else {
throw new RuntimeException("bad " + ch);
}
continue;
case '\"':
int start0 = i-1;
while (i < chars.length && !(chars[i]=='\"')) i++;
i += 1;
tokens.add(BasicToken.makeLiteral(new String(chars, start0+1, i-start0-2), "string", start0, i-1));
continue;
default:
int start = i-1;
while (i < chars.length && Character.isJavaIdentifierPart(chars[i])) { i++; }
tokens.add(BasicToken.makeIdentifier(new String(chars, start, i-start), start, i-1));
}
}
//System.out.println(tokens);
return new BasicTokenSource((IToken[])tokens.toArray(new IToken[tokens.size()]), context);
}
private static String makeString(char ch) {
return Character.toString(ch);
}
private static String makeString(char ch, int count) {
// slightly inefficient ;-)
char[] chars = new char[count];
for (int i=0; i<count; i++) { chars[i] = ch; }
return new String(chars);
}
public ISourceContext getSourceContext() {
return sourceContext;
}
public void setSourceContext(ISourceContext context) {
this.sourceContext = context;
}
}