net.sourceforge.plantuml.logo.LogoScanner Maven / Gradle / Ivy
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PlantUML is a component that allows to quickly write :
* sequence diagram,
* use case diagram,
* class diagram,
* activity diagram,
* component diagram,
* state diagram
* object diagram
/* ========================================================================
* PlantUML : a free UML diagram generator
* ========================================================================
*
* (C) Copyright 2009-2013, Arnaud Roques
*
* Project Info: http://plantuml.sourceforge.net
*
* This file is part of PlantUML.
*
* PlantUML 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 3 of the License, or
* (at your option) any later version.
*
* PlantUML distributed in the hope that it will be useful, but
* 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.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* Original Author: Arnaud Roques
*
* Revision $Revision: 4041 $
*
*/
package net.sourceforge.plantuml.logo;
import java.util.HashMap;
import java.util.Map;
class LogoScanner {
final private Map keywordTable = new HashMap();
private char sourceString[];
private int sourceLength;
private int i;
public LogoScanner() {
keywordTable.put("forward", new Integer(LogoToken.FORWARD));
keywordTable.put("fd", new Integer(LogoToken.FORWARD));
keywordTable.put("back", new Integer(LogoToken.BACK));
keywordTable.put("bk", new Integer(LogoToken.BACK));
keywordTable.put("right", new Integer(LogoToken.RIGHT));
keywordTable.put("rt", new Integer(LogoToken.RIGHT));
keywordTable.put("left", new Integer(LogoToken.LEFT));
keywordTable.put("lt", new Integer(LogoToken.LEFT));
keywordTable.put("penup", new Integer(LogoToken.PENUP));
keywordTable.put("pu", new Integer(LogoToken.PENUP));
keywordTable.put("pendown", new Integer(LogoToken.PENDOWN));
keywordTable.put("pd", new Integer(LogoToken.PENDOWN));
keywordTable.put("hideturtle", new Integer(LogoToken.HIDETURTLE));
keywordTable.put("ht", new Integer(LogoToken.HIDETURTLE));
keywordTable.put("showturtle", new Integer(LogoToken.SHOWTURTLE));
keywordTable.put("st", new Integer(LogoToken.SHOWTURTLE));
keywordTable.put("clearscreen", new Integer(LogoToken.CLEARSCREEN));
keywordTable.put("cs", new Integer(LogoToken.CLEARSCREEN));
keywordTable.put("repeat", new Integer(LogoToken.REPEAT));
keywordTable.put("rep", new Integer(LogoToken.REPEAT));
keywordTable.put("to", new Integer(LogoToken.TO));
keywordTable.put("setpc", new Integer(LogoToken.SETPC));
keywordTable.put("pc", new Integer(LogoToken.SETPC));
}
public int getPosition() {
return i;
}
public void setPosition(int newPosition) {
if (i >= 0 && i <= sourceLength) {
i = newPosition;
} else {
i = sourceLength;
}
}
public void setSourceString(String newSourceString) {
sourceLength = newSourceString.length();
sourceString = newSourceString.concat("\0").toCharArray();
i = 0;
}
public String getSourceString() {
return new String(sourceString);
}
public String getRestAsString() {
skipWhitespace();
final String rest = new String(sourceString, i, sourceLength - i + 1);
i = sourceLength;
return rest;
}
void skipWhitespace() {
char c;
do {
c = sourceString[i++];
} while (c == ' ' || c == '\t');
i--;
}
public LogoToken getToken() {
final LogoToken token = new LogoToken();
final StringBuffer lexeme = new StringBuffer();
if (i >= sourceLength) {
token.kind = LogoToken.END_OF_INPUT;
return token;
}
// Skip whitespace.
skipWhitespace();
char c = sourceString[i++];
// Now figure out what kind of token we've got.
if (c == '[' || c == ']') {
token.kind = c;
token.lexeme = String.valueOf(c);
} else if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
do {
lexeme.append(c);
c = sourceString[i++];
} while ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'));
i--;
token.lexeme = lexeme.toString();
token.kind = LogoToken.IDENTIFIER;
final Integer keyword = keywordTable.get(token.lexeme);
if (keyword != null) {
token.kind = keyword.intValue();
}
} else if (c >= '0' && c <= '9') {
do {
lexeme.append(c);
c = sourceString[i++];
} while (c >= '0' && c <= '9');
boolean hasDecimalPart = false;
if (c == '.') {
do {
lexeme.append(c);
c = sourceString[i++];
} while (c >= '0' && c <= '9');
hasDecimalPart = true;
}
i--;
token.lexeme = lexeme.toString();
token.value = Float.valueOf(token.lexeme).floatValue();
if (hasDecimalPart) {
token.kind = LogoToken.FLOAT;
} else {
token.kind = LogoToken.INTEGER;
token.intValue = Integer.valueOf(token.lexeme).intValue();
}
} else if (c == 0) {
i--;
token.kind = LogoToken.END_OF_INPUT;
} else {
i--;
token.kind = LogoToken.INVALID_TOKEN;
}
return token;
}
}