/*
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.
*/
package org.apache.batik.parser;
import java.io.IOException;
This class implements an event-based parser for the SVG length
values.
Author: Stephane Hillion Version: $Id: LengthParser.java 1802297 2017-07-18 13:58:12Z ssteiner $
/**
* This class implements an event-based parser for the SVG length
* values.
*
* @author <a href="mailto:stephane@hillion.org">Stephane Hillion</a>
* @version $Id: LengthParser.java 1802297 2017-07-18 13:58:12Z ssteiner $
*/
public class LengthParser extends AbstractParser {
The length handler used to report parse events.
/**
* The length handler used to report parse events.
*/
protected LengthHandler lengthHandler;
Creates a new LengthParser.
/**
* Creates a new LengthParser.
*/
public LengthParser() {
lengthHandler = DefaultLengthHandler.INSTANCE;
}
Allows an application to register a length handler.
If the application does not register a handler, all
events reported by the parser will be silently ignored.
Applications may register a new or different handler in the
middle of a parse, and the parser must begin using the new
handler immediately.
Params: - handler – The transform list handler.
/**
* Allows an application to register a length handler.
*
* <p>If the application does not register a handler, all
* events reported by the parser will be silently ignored.
*
* <p>Applications may register a new or different handler in the
* middle of a parse, and the parser must begin using the new
* handler immediately.</p>
* @param handler The transform list handler.
*/
public void setLengthHandler(LengthHandler handler) {
lengthHandler = handler;
}
Returns the length handler in use.
/**
* Returns the length handler in use.
*/
public LengthHandler getLengthHandler() {
return lengthHandler;
}
protected void doParse() throws ParseException, IOException {
lengthHandler.startLength();
current = reader.read();
skipSpaces();
parseLength();
skipSpaces();
if (current != -1) {
reportError("end.of.stream.expected",
new Object[] {current});
}
lengthHandler.endLength();
}
Parses a length value.
/**
* Parses a length value.
*/
protected void parseLength() throws ParseException, IOException {
int mant = 0;
int mantDig = 0;
boolean mantPos = true;
boolean mantRead = false;
int exp = 0;
int expDig = 0;
int expAdj = 0;
boolean expPos = true;
int unitState = 0;
switch (current) {
case '-':
mantPos = false;
case '+':
current = reader.read();
}
m1: switch (current) {
default:
reportUnexpectedCharacterError( current );
return;
case '.':
break;
case '0':
mantRead = true;
l: for (;;) {
current = reader.read();
switch (current) {
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
break l;
default:
break m1;
case '0':
}
}
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
mantRead = true;
l: for (;;) {
if (mantDig < 9) {
mantDig++;
mant = mant * 10 + (current - '0');
} else {
expAdj++;
}
current = reader.read();
switch (current) {
default:
break l;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
}
}
}
if (current == '.') {
current = reader.read();
m2: switch (current) {
default:
case 'e': case 'E':
if (!mantRead) {
reportUnexpectedCharacterError( current );
return;
}
break;
case '0':
if (mantDig == 0) {
l: for (;;) {
current = reader.read();
expAdj--;
switch (current) {
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
break l;
default:
break m2;
case '0':
}
}
}
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
l: for (;;) {
if (mantDig < 9) {
mantDig++;
mant = mant * 10 + (current - '0');
expAdj--;
}
current = reader.read();
switch (current) {
default:
break l;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
}
}
}
}
boolean le = false;
es: switch (current) {
case 'e':
le = true;
case 'E':
current = reader.read();
switch (current) {
default:
reportUnexpectedCharacterError( current );
return;
case 'm':
if (!le) {
reportUnexpectedCharacterError( current );
return;
}
unitState = 1;
break es;
case 'x':
if (!le) {
reportUnexpectedCharacterError( current );
return;
}
unitState = 2;
break es;
case '-':
expPos = false;
case '+':
current = reader.read();
switch (current) {
default:
reportUnexpectedCharacterError( current );
return;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
}
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
}
en: switch (current) {
case '0':
l: for (;;) {
current = reader.read();
switch (current) {
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
break l;
default:
break en;
case '0':
}
}
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
l: for (;;) {
if (expDig < 3) {
expDig++;
exp = exp * 10 + (current - '0');
}
current = reader.read();
switch (current) {
default:
break l;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
}
}
}
default:
}
if (!expPos) {
exp = -exp;
}
exp += expAdj;
if (!mantPos) {
mant = -mant;
}
lengthHandler.lengthValue(NumberParser.buildFloat(mant, exp));
switch (unitState) {
case 1:
lengthHandler.em();
current = reader.read();
return;
case 2:
lengthHandler.ex();
current = reader.read();
return;
}
switch (current) {
case 'e':
current = reader.read();
switch (current) {
case 'm':
lengthHandler.em();
current = reader.read();
break;
case 'x':
lengthHandler.ex();
current = reader.read();
break;
default:
reportUnexpectedCharacterError( current );
}
break;
case 'p':
current = reader.read();
switch (current) {
case 'c':
lengthHandler.pc();
current = reader.read();
break;
case 't':
lengthHandler.pt();
current = reader.read();
break;
case 'x':
lengthHandler.px();
current = reader.read();
break;
default:
reportUnexpectedCharacterError( current );
}
break;
case 'i':
current = reader.read();
if (current != 'n') {
reportCharacterExpectedError( 'n', current );
break;
}
lengthHandler.in();
current = reader.read();
break;
case 'c':
current = reader.read();
if (current != 'm') {
reportCharacterExpectedError( 'm',current );
break;
}
lengthHandler.cm();
current = reader.read();
break;
case 'm':
current = reader.read();
if (current != 'm') {
reportCharacterExpectedError( 'm',current );
break;
}
lengthHandler.mm();
current = reader.read();
break;
case '%':
lengthHandler.percentage();
current = reader.read();
break;
}
}
}