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UnicodePreprocessor.java
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executable file
·131 lines (112 loc) · 2.94 KB
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/* This file is part of the Java 1.5 grammar for SableCC.
*
* Copyright 2006 Etienne M. Gagnon <[email protected]>
*
* 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.
*/
import org.sablecc.grammars.java_1_5.unicodepreprocessor.lexer.*;
import org.sablecc.grammars.java_1_5.unicodepreprocessor.node.*;
import org.sablecc.grammars.java_1_5.unicodepreprocessor.analysis.*;
import java.io.*;
public class UnicodePreprocessor extends Reader
{
private UnicodeLexer lexer;
private ProcessToken processor = new ProcessToken();
public UnicodePreprocessor(PushbackReader in)
{
lexer = new UnicodeLexer(in);
}
public int read() throws IOException
{
if(available == 0)
{
try
{
lexer.next().apply(processor);
}
catch(LexerException e)
{
throw new RuntimeException(e.toString());
}
}
if(available == 0)
{
return -1;
}
char c = buffer[0];
buffer[0] = buffer[1];
available--;
return c;
}
public int read(
char cbuf[],
int off,
int len) throws IOException
{
for(int i = 0; i <len; i++)
{
int c = read();
if(c == -1)
{
if(i == 0)
{
return -1;
}
else
{
return i;
}
}
cbuf[off + i] = (char) c;
}
return len;
}
int available;
char[] buffer = new char[2];
private class ProcessToken extends AnalysisAdapter
{
public void caseTEvenBackslash(TEvenBackslash node)
{
buffer[0] = '\\';
buffer[1] = '\\';
available = 2;
}
public void caseTUnicodeEscape(TUnicodeEscape node)
{
String text = node.getText();
buffer[0] = (char) Integer.parseInt(text.substring(text.length() - 4), 16);
available = 1;
}
public void caseTErroneousEscape(TErroneousEscape node)
{
throw new RuntimeException("Erroneous escape: " + node);
}
public void caseTSub(TSub node)
{
buffer[0] = node.getText().charAt(0);
available = 1;
}
public void caseTRawInputCharacter(TRawInputCharacter node)
{
buffer[0] = node.getText().charAt(0);
available = 1;
}
public void caseEOF(EOF node)
{
available = 0;
}
}
public void close()
{
}
}