/*
* This file is part of LaTeXDraw.
* Copyright (c) 2005-2017 Arnaud BLOUIN
* LaTeXDraw is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later version.
* LaTeXDraw is distributed without any warranty; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
package net.sf.latexdraw.parsers.svg.parsers;
import java.text.ParseException;
/**
* Defines a SVG number parser.
* @author Arnaud BLOUIN
*/
public class SVGNumberParser extends AbstractSVGParser {
/**
* The constructor.
* @param code The code to parse.
*/
public SVGNumberParser(final String code) {
super(code);
}
/**
* Parses a flag (a boolean).
* @return True or false.
* @throws ParseException If an error occurs.
* @since 0.1
*/
public boolean parseFlag() throws ParseException {
skipWSP();
final int c = getChar();
if(c=='0' || c=='1') {
nextChar();
return c == '1';
}
throw new ParseException("Flag expected.", getPosition()); //$NON-NLS-1$
}
/**
* Parses a number (a double).
* @param unsigned True: the parsed number must be unsigned.
* @return The parsed number as a string.
* @throws ParseException If an error occurs or if the parsed number is signed and <code>unsigned</code> is true.
*/
public String parseNumberAsString(final boolean unsigned) throws ParseException {
boolean again = true;
int c;
final int start;
skipWSP();
start = getPosition();
c = getChar();
if(c=='-' || c=='+') {// Reading the sign
if(unsigned)
throw new ParseException("Unsigned number expected.", getPosition());//$NON-NLS-1$
c = nextChar();
}
while(again && !isEOC()) // Reading the first part of the number.
if(c<48 || c>58)
again = false;
else
c = nextChar();
if(c=='.') {
c = nextChar();
again = true;
while(again && !isEOC()) // Reading the second part of the number.
if(c<48 || c>58)
again = false;
else
c = nextChar();
}
if(c=='E' || c=='e') { // Reading the exponent.
c = nextChar();
again = true;
if(c=='-' || c=='+')// Reading the sign
c = nextChar();
while(again && !isEOC()) // Reading the exponent.
if(c<48 || c>58)
again = false;
else
c = nextChar();
}
try { Double.parseDouble(getCode().substring(start, getPosition())); }
catch(final NumberFormatException e) { throw new ParseException("Invalid number.", getPosition()); }//$NON-NLS-1$
return getCode().substring(start, getPosition());
}
/**
* Parses a number (a double).
* @param unsigned True: the parsed number must be unsigned.
* @return The parsed number.
* @throws ParseException If an error occurs or if the parsed number is signed and <code>unsigned</code> is true.
*/
public double parseNumber(final boolean unsigned) throws ParseException {
final String number = parseNumberAsString(unsigned);
try { return Double.parseDouble(number); }
catch(final NumberFormatException e) { throw new ParseException("Invalid number.", getPosition()); }//$NON-NLS-1$
}
/**
* @return True if the current character is the beginning of a number.
* @param unsigned True: the next number must not have a sign.
*/
protected boolean isNumber(final boolean unsigned) {
final int c = getChar();
if(unsigned)
return c=='.' || c>=48 && c<=57;
return c=='-' || c=='+' || c=='.' || c>=48 && c<=57;
}
@Override
public void parse() throws ParseException {
// Nothing to do.
}
}