w3c.css.properties.css3.CssTransform Maven / Gradle / Ivy
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Backend for the W3C CSS Validation Service
// $Id$
// Author: Yves Lafon
//
// (c) COPYRIGHT MIT, ERCIM and Keio University, 2012.
// Please first read the full copyright statement in file COPYRIGHT.html
package org.w3c.css.properties.css3;
import org.w3c.css.properties.css.CssProperty;
import org.w3c.css.util.ApplContext;
import org.w3c.css.util.InvalidParamException;
import org.w3c.css.values.CssExpression;
import org.w3c.css.values.CssFunction;
import org.w3c.css.values.CssTypes;
import org.w3c.css.values.CssValue;
import org.w3c.css.values.CssValueList;
import java.util.ArrayList;
import static org.w3c.css.values.CssOperator.COMMA;
import static org.w3c.css.values.CssOperator.SPACE;
/**
* @spec http://www.w3.org/TR/2012/WD-css3-transforms-20120911/#effects
*/
public class CssTransform extends org.w3c.css.properties.css.CssTransform {
// 2d functions
static final String matrix = "matrix";
static final String translate = "translate";
static final String translateX = "translatex"; // lowercase translateX
static final String translateY = "translatey"; // lowercase translateY
static final String scale = "scale";
static final String scaleX = "scalex"; // lowercase scaleX
static final String scaleY = "scaley"; // lowercase scaleY
static final String rotate = "rotate";
static final String skew = "skew";
static final String skewX = "skewx"; // lowercase skewX
static final String skewY = "skewy"; // lowercase skewY
// 3d functions
static final String matrix3d = "matrix3d";
static final String translate3d = "translate3d";
static final String translateZ = "translatez"; // lowercase translateZ
static final String scale3d = "scale3d";
static final String scaleZ = "scalez"; // lowercalse scaleZ
static final String rotate3d = "rotate3d";
static final String rotateX = "rotatex"; // lowercase rotateX
static final String rotateY = "rotatey"; // lowercase rotateY
static final String rotateZ = "rotatez"; // lowercase rotateZ
static final String perspective = "perspective";
/**
* Create a new CssTransform
*/
public CssTransform() {
value = initial;
}
/**
* Creates a new CssTransform
*
* @param expression The expression for this property
* @throws org.w3c.css.util.InvalidParamException
* Expressions are incorrect
*/
public CssTransform(ApplContext ac, CssExpression expression, boolean check)
throws InvalidParamException {
setByUser();
CssValue val;
char op;
ArrayList values = new ArrayList();
boolean singleVal = false;
CssValue sValue = null;
while (!expression.end()) {
val = expression.getValue();
op = expression.getOperator();
switch (val.getType()) {
case CssTypes.CSS_FUNCTION:
parseFunctionValues(ac, val, this);
values.add(val);
break;
case CssTypes.CSS_IDENT:
if (inherit.equals(val)) {
singleVal = true;
sValue = inherit;
values.add(inherit);
break;
} else if (none.equals(val)) {
singleVal = true;
sValue = none;
values.add(none);
break;
}
// if not recognized, let it fail
default:
throw new InvalidParamException("value",
val.toString(),
getPropertyName(), ac);
}
expression.next();
if (!expression.end() && (op != SPACE)) {
throw new InvalidParamException("operator",
((new Character(op)).toString()), ac);
}
}
if (singleVal && values.size() > 1) {
throw new InvalidParamException("value",
sValue.toString(),
getPropertyName(), ac);
}
value = (values.size() == 1) ? values.get(0) : new CssValueList(values);
}
public CssTransform(ApplContext ac, CssExpression expression)
throws InvalidParamException {
this(ac, expression, false);
}
protected static void parseFunctionValues(ApplContext ac, CssValue func, CssProperty caller)
throws InvalidParamException {
CssFunction function = (CssFunction) func;
String fname = function.getName().toLowerCase();
// waiting for jdk7 for the string-based switch/case
// 2d functions
if (matrix.equals(fname)) {
parseExactlyNX(ac, function.getParameters(), 6, CssTypes.CSS_NUMBER, caller);
} else if (translate.equals(fname)) {
parseTranslateFunction(ac, function.getParameters(), caller);
} else if (translateX.equals(fname) || translateY.equals(fname)) {
parseTranslateAxisFunction(ac, function.getParameters(), caller);
} else if (scale.equals(fname)) {
parseAtMostX(ac, function.getParameters(), 2, CssTypes.CSS_NUMBER, caller);
} else if (scaleX.equals(fname) || scaleY.equals(fname)) {
parseOneX(ac, function.getParameters(), CssTypes.CSS_NUMBER, caller);
} else if (rotate.equals(fname)) {
parseOneX(ac, function.getParameters(), CssTypes.CSS_ANGLE, caller);
} else if (skew.equals(fname)) {
parseAtMostX(ac, function.getParameters(), 2, CssTypes.CSS_ANGLE, caller);
} else if (skewX.equals(fname) || skewY.equals(fname)) {
parseOneX(ac, function.getParameters(), CssTypes.CSS_ANGLE, caller);
/* after this line, 3d functions */
} else if (matrix3d.equals(fname)) {
parseExactlyNX(ac, function.getParameters(), 16, CssTypes.CSS_NUMBER, caller);
} else if (translate3d.equals(fname)) {
parseTranslate3dFunction(ac, function.getParameters(), caller);
} else if (translateZ.endsWith(fname)) {
parseOneX(ac, function.getParameters(), CssTypes.CSS_LENGTH, caller);
} else if (scale3d.equals(fname)) {
parseExactlyNX(ac, function.getParameters(), 3, CssTypes.CSS_NUMBER, caller);
} else if (scaleZ.equals(fname)) {
parseOneX(ac, function.getParameters(), CssTypes.CSS_NUMBER, caller);
} else if (rotate3d.equals(fname)) {
parseRotate3dFunction(ac, function.getParameters(), caller);
} else if (rotateX.equals(fname) || rotateY.equals(fname) || rotateZ.equals(fname)) {
parseOneX(ac, function.getParameters(), CssTypes.CSS_ANGLE, caller);
} else if (perspective.endsWith(fname)) {
parseOneX(ac, function.getParameters(), CssTypes.CSS_LENGTH, caller);
} else {
// unrecognized function
throw new InvalidParamException("value",
func.toString(),
caller.getPropertyName(), ac);
}
}
private static void parseExactlyNX(ApplContext ac, CssExpression expression,
int n, int type, CssProperty caller)
throws InvalidParamException {
if (expression.getCount() < n) {
throw new InvalidParamException("few-value", caller.getPropertyName(), ac);
}
parseAtMostX(ac, expression, n, CssTypes.CSS_NUMBER, caller);
}
// parse at most n values of type (CssTypes.XXX)
private static void parseAtMostX(ApplContext ac, CssExpression expression,
int atMost, int type, CssProperty caller)
throws InvalidParamException {
if (expression.getCount() > atMost) {
throw new InvalidParamException("unrecognize", ac);
}
CssValue val;
char op;
while (!expression.end()) {
val = expression.getValue();
op = expression.getOperator();
// special case, 0 can be a length or an angle...
if (val.getType() == CssTypes.CSS_NUMBER) {
switch (type) {
case CssTypes.CSS_LENGTH:
val.getLength();
break;
case CssTypes.CSS_ANGLE:
val.getAngle();
case CssTypes.CSS_NUMBER:
break;
default:
throw new InvalidParamException("value",
val.toString(),
caller.getPropertyName(), ac);
}
} else if (val.getType() != type) {
throw new InvalidParamException("value",
val.toString(),
caller.getPropertyName(), ac);
}
expression.next();
if (!expression.end() && (op != COMMA)) {
throw new InvalidParamException("operator",
((new Character(op)).toString()), ac);
}
}
}
// parse one value of type (CssTypes.XXX)
private static void parseOneX(ApplContext ac, CssExpression expression,
int type, CssProperty caller)
throws InvalidParamException {
if (expression.getCount() > 1) {
throw new InvalidParamException("unrecognize", ac);
}
if (expression.getCount() == 0) {
throw new InvalidParamException("few-value", caller.getPropertyName(), ac);
}
CssValue val;
val = expression.getValue();
// special case, 0 can be a length or an angle...
if (val.getType() == CssTypes.CSS_NUMBER) {
if (type == CssTypes.CSS_LENGTH || type == CssTypes.CSS_ANGLE) {
// if not zero, it will fail
if (val.getNumber().isZero()) {
expression.next();
return;
}
}
}
if (val.getType() != type) {
throw new InvalidParamException("value",
val.toString(),
caller.getPropertyName(), ac);
}
expression.next();
}
// special cases
// http://www.w3.org/TR/2012/WD-css3-transforms-20120911/#translate-function
private static void parseTranslateFunction(ApplContext ac, CssExpression expression, CssProperty caller)
throws InvalidParamException {
if (expression.getCount() > 2) {
throw new InvalidParamException("unrecognize", ac);
}
if (expression.getCount() == 0) {
throw new InvalidParamException("few-value", caller.getPropertyName(), ac);
}
CssValue val;
char op;
while (!expression.end()) {
val = expression.getValue();
op = expression.getOperator();
switch (val.getType()) {
case CssTypes.CSS_NUMBER:
val.getLength();
case CssTypes.CSS_LENGTH:
case CssTypes.CSS_PERCENTAGE:
break;
default:
throw new InvalidParamException("value",
val.toString(),
caller.getPropertyName(), ac);
}
expression.next();
if (!expression.end() && (op != COMMA)) {
throw new InvalidParamException("operator",
((new Character(op)).toString()), ac);
}
}
}
// http://www.w3.org/TR/2012/WD-css3-transforms-20120911/#translateX-function
private static void parseTranslateAxisFunction(ApplContext ac, CssExpression expression, CssProperty caller)
throws InvalidParamException {
if (expression.getCount() > 1) {
throw new InvalidParamException("unrecognize", ac);
}
if (expression.getCount() == 0) {
throw new InvalidParamException("few-value", caller.getPropertyName(), ac);
}
CssValue val;
val = expression.getValue();
switch (val.getType()) {
case CssTypes.CSS_NUMBER:
val.getLength();
case CssTypes.CSS_LENGTH:
case CssTypes.CSS_PERCENTAGE:
break;
default:
throw new InvalidParamException("value",
val.toString(),
caller.getPropertyName(), ac);
}
expression.next();
}
// http://www.w3.org/TR/2012/WD-css3-transforms-20120911/#translate3d-function
private static void parseTranslate3dFunction(ApplContext ac, CssExpression expression, CssProperty caller)
throws InvalidParamException {
if (expression.getCount() < 3) {
throw new InvalidParamException("few-value", caller.getPropertyName(), ac);
}
if (expression.getCount() > 3) {
throw new InvalidParamException("unrecognize", ac);
}
CssValue val;
char op;
for (int i = 0; i < 2; i++) {
val = expression.getValue();
op = expression.getOperator();
switch (val.getType()) {
case CssTypes.CSS_NUMBER:
val.getLength();
case CssTypes.CSS_LENGTH:
case CssTypes.CSS_PERCENTAGE:
break;
default:
throw new InvalidParamException("value",
val.toString(),
caller.getPropertyName(), ac);
}
expression.next();
if (op != COMMA) {
throw new InvalidParamException("operator",
((new Character(op)).toString()), ac);
}
}
val = expression.getValue();
if (val.getType() == CssTypes.CSS_NUMBER) {
val.getLength();
} else if (val.getType() != CssTypes.CSS_LENGTH) {
throw new InvalidParamException("value",
val.toString(),
caller.getPropertyName(), ac);
}
expression.next();
}
// http://www.w3.org/TR/2012/WD-css3-transforms-20120911/#rotate3d-function
private static void parseRotate3dFunction(ApplContext ac, CssExpression expression, CssProperty caller)
throws InvalidParamException {
if (expression.getCount() < 4) {
throw new InvalidParamException("few-value", caller.getPropertyName(), ac);
}
if (expression.getCount() > 4) {
throw new InvalidParamException("unrecognize", ac);
}
CssValue val;
char op;
for (int i = 0; i < 3; i++) {
val = expression.getValue();
op = expression.getOperator();
if (val.getType() != CssTypes.CSS_NUMBER) {
throw new InvalidParamException("value",
val.toString(),
caller.getPropertyName(), ac);
}
expression.next();
if (op != COMMA) {
throw new InvalidParamException("operator",
((new Character(op)).toString()), ac);
}
}
val = expression.getValue();
if (val.getType() != CssTypes.CSS_ANGLE) {
throw new InvalidParamException("value",
val.toString(),
caller.getPropertyName(), ac);
}
expression.next();
}
}
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