package org.vectomatic.dom.svg.impl;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.vectomatic.dom.svg.OMCSSPrimitiveValue;
import org.vectomatic.dom.svg.OMCSSValue;
import org.vectomatic.dom.svg.OMCSSValueList;
import org.vectomatic.dom.svg.utils.SVGConstants;
import com.gargoylesoftware.htmlunit.javascript.host.css.CSSPrimitiveValue;
import com.google.gwt.core.client.JavaScriptException;
import com.google.gwt.regexp.shared.MatchResult;
import com.google.gwt.regexp.shared.RegExp;
/**
* Class to parse SVG dash arrays. Do not call this class directly,
* it will be removed when browser provide good native support for it.
* Following is the BNF grammar of the expression supported.
* <pre>
* dasharray ::= (length | percentage) (comma-wsp dasharray)?
* length ::= number (~"em" | ~"ex" | ~"px" | ~"in" | ~"cm" | ~"mm" | ~"pt" | ~"pc")?
* length ::= number ("em" | "ex" | "px" | "in" | "cm" | "mm" | "pt" | "pc" | "%")?
* number ::= integer | [+-]? [0-9]* "." [0-9]+
* </pre>
* @author laaglu
*/
public class DashArrayParser {
private static final String WS = "\\s*";
private static final String COMMA = WS + "," + WS;
private static final RegExp LENGTH = RegExp.compile("^[+-]?((?:0|[1-9][0-9]*)(?:\\.[0-9]+)?)(em|ex|px|in|cm|mm|pt|pc|%)?$", "i");
public static final DashArrayParser INSTANCE = new DashArrayParser();
private Map<String, Short> unitToPrimitiveType;
private DashArrayParser() {
unitToPrimitiveType = new HashMap<String, Short>();
unitToPrimitiveType.put("em", CSSPrimitiveValue.CSS_EMS);
unitToPrimitiveType.put("ex", CSSPrimitiveValue.CSS_EXS);
unitToPrimitiveType.put("px", CSSPrimitiveValue.CSS_PX);
unitToPrimitiveType.put("in", CSSPrimitiveValue.CSS_IN);
unitToPrimitiveType.put("cm", CSSPrimitiveValue.CSS_CM);
unitToPrimitiveType.put("mm", CSSPrimitiveValue.CSS_MM);
unitToPrimitiveType.put("pt", CSSPrimitiveValue.CSS_PT);
unitToPrimitiveType.put("pc", CSSPrimitiveValue.CSS_PC);
unitToPrimitiveType.put("%", CSSPrimitiveValue.CSS_PERCENTAGE);
}
public OMCSSValue parse(String cssText) {
OMCSSValue[] values = null;
if (SVGConstants.CSS_NONE_VALUE.equals(cssText) || cssText == null || cssText.length() == 0) {
return new OMCSSPrimitiveValue(cssText, OMCSSPrimitiveValue.CSS_IDENT);
} else if (SVGConstants.CSS_INHERIT_VALUE.equals(cssText)) {
return new OMCSSPrimitiveValue(cssText, OMCSSPrimitiveValue.CSS_IDENT);
}
List<OMCSSPrimitiveValue> lengths = new ArrayList<OMCSSPrimitiveValue>();
String[] lengthArray = cssText.split(COMMA);
for (int i = 0; i < lengthArray.length; i++) {
if (lengthArray[i].length() > 0) {
LENGTH.setLastIndex(0);
String length = lengthArray[i].trim();
MatchResult result = LENGTH.exec(length);
if (result != null && result.getGroupCount() == 3) {
short primitiveType = CSSPrimitiveValue.CSS_NUMBER;
String unit = result.getGroup(2);
if (unit != null) {
primitiveType = unitToPrimitiveType.get(unit.toLowerCase());
}
float value = Float.parseFloat(result.getGroup(1));
lengths.add(new OMCSSPrimitiveValue(value, primitiveType));
} else {
throw new JavaScriptException("Invalid length spec: " + length);
}
}
}
values = lengths.toArray(new OMCSSValue[lengths.size()]);
return new OMCSSValueList(values, cssText);
}
}