/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
/* $Id$ */
package org.apache.fop.fonts.type1;
import java.io.IOException;
import java.util.Map;
import java.util.Stack;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.fop.fonts.NamedCharacter;
import org.apache.fop.fonts.type1.AFMParser.ValueHandler;
/**
* A handler that parses the various types of character metrics in an AFM file.
*/
abstract class CharMetricsHandler {
private static final Log LOG = LogFactory.getLog(CharMetricsHandler.class);
private static final String WHITE_SPACE = "\\s*";
private static final String OPERATOR = "([A-Z0-9]{1,3})";
private static final String OPERANDS = "(.*)";
private static final Pattern METRICS_REGEX = Pattern.compile(
WHITE_SPACE + OPERATOR + WHITE_SPACE + OPERANDS + WHITE_SPACE);
private static final Pattern SPLIT_REGEX = Pattern.compile(WHITE_SPACE + ";" + WHITE_SPACE);
private CharMetricsHandler() {
}
abstract AFMCharMetrics parse(String line, Stack<Object> stack, String afmFileName)
throws IOException;
static CharMetricsHandler getHandler(Map<String, ValueHandler> valueParsers,
String line) {
if (line != null && line.contains(AdobeStandardEncoding.NAME)) {
return new AdobeStandardCharMetricsHandler(valueParsers);
} else {
return new DefaultCharMetricsHandler(valueParsers);
}
}
private static final class DefaultCharMetricsHandler extends CharMetricsHandler {
private final Map<String, ValueHandler> valueParsers;
private DefaultCharMetricsHandler(Map<String, ValueHandler> valueParsers) {
this.valueParsers = valueParsers;
}
AFMCharMetrics parse(String line, Stack<Object> stack, String afmFileName)
throws IOException {
AFMCharMetrics chm = new AFMCharMetrics();
stack.push(chm);
String[] metrics = SPLIT_REGEX.split(line);
for (String metric : metrics) {
Matcher matcher = METRICS_REGEX.matcher(metric);
if (matcher.matches()) {
String operator = matcher.group(1);
String operands = matcher.group(2);
ValueHandler handler = valueParsers.get(operator);
if (handler != null) {
handler.parse(operands, 0, stack);
}
}
}
stack.pop();
return chm;
}
}
private static final class AdobeStandardCharMetricsHandler extends CharMetricsHandler {
private final DefaultCharMetricsHandler defaultHandler;
private AdobeStandardCharMetricsHandler(Map<String, ValueHandler> valueParsers) {
defaultHandler = new DefaultCharMetricsHandler(valueParsers);
}
AFMCharMetrics parse(String line, Stack<Object> stack, String afmFileName)
throws IOException {
AFMCharMetrics chm = defaultHandler.parse(line, stack, afmFileName);
NamedCharacter namedChar = chm.getCharacter();
if (namedChar != null) {
int codePoint = AdobeStandardEncoding.getAdobeCodePoint(namedChar.getName());
if (chm.getCharCode() != codePoint) {
LOG.info(afmFileName + ": named character '" + namedChar.getName() + "'"
+ " has an incorrect code point: " + chm.getCharCode()
+ ". Changed to " + codePoint);
chm.setCharCode(codePoint);
}
}
return chm;
}
}
}