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A Less CSS compiler written completely in Java (pure Java).
/**
* MIT License (MIT)
*
* Copyright (c) 2014 - 2019 Volker Berlin
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* UT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @author Volker Berlin
* @license: The MIT license
*/
package com.inet.lib.less;
import static com.inet.lib.less.ColorUtils.alpha;
import static com.inet.lib.less.ColorUtils.argb;
import static com.inet.lib.less.ColorUtils.average;
import static com.inet.lib.less.ColorUtils.blue;
import static com.inet.lib.less.ColorUtils.colorDigit;
import static com.inet.lib.less.ColorUtils.contrast;
import static com.inet.lib.less.ColorUtils.difference;
import static com.inet.lib.less.ColorUtils.exclusion;
import static com.inet.lib.less.ColorUtils.green;
import static com.inet.lib.less.ColorUtils.hardlight;
import static com.inet.lib.less.ColorUtils.hsla;
import static com.inet.lib.less.ColorUtils.hsva;
import static com.inet.lib.less.ColorUtils.luma;
import static com.inet.lib.less.ColorUtils.luminance;
import static com.inet.lib.less.ColorUtils.mix;
import static com.inet.lib.less.ColorUtils.multiply;
import static com.inet.lib.less.ColorUtils.negation;
import static com.inet.lib.less.ColorUtils.overlay;
import static com.inet.lib.less.ColorUtils.red;
import static com.inet.lib.less.ColorUtils.rgb;
import static com.inet.lib.less.ColorUtils.rgba;
import static com.inet.lib.less.ColorUtils.screen;
import static com.inet.lib.less.ColorUtils.softlight;
import static com.inet.lib.less.ColorUtils.toHSL;
import static com.inet.lib.less.ColorUtils.toHSV;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.Nonnull;
/**
* A function (less or CSS).
*/
class FunctionExpression extends Expression {
private final List parameters;
private int type;
private double doubleValue;
private boolean booleanValue;
/**
* Create a new instance.
*
* @param obj
* another LessObject with parse position.
* @param name
* the name of the method, if empty then it are parenthesis
* @param parameters
* the parameters of the function
*/
FunctionExpression( LessObject obj, @Nonnull String name, @Nonnull Operation parameters ) {
super( obj, name );
this.parameters = parameters.getOperands();
}
/**
* {@inheritDoc}
*/
@Override
public int getDataType( CssFormatter formatter ) {
if( type == UNKNOWN ) {
eval( formatter );
}
return type;
}
/**
* {@inheritDoc}
*/
@Override
public double doubleValue( CssFormatter formatter ) {
eval( formatter );
return doubleValue;
}
/**
* {@inheritDoc}
*/
@Override
public boolean booleanValue( CssFormatter formatter ) {
eval( formatter );
return booleanValue;
}
/**
* {@inheritDoc}
*/
@Override
public String unit( CssFormatter formatter ) {
switch( super.toString() ) {
case "unit":
if( parameters.size() <= 1 ) {
return "";
} else {
return get( 1 ).stringValue( formatter );
}
case "convert":
return get( 1 ).stringValue( formatter );
case "sin":
case "cos":
case "tan":
case "length":
return "";
case "acos":
case "asin":
case "atan":
return "rad";
case "pow":
return get( 0 ).unit( formatter );
case "alpha":
case "red":
case "green":
case "blue":
case "rgba":
case "rgb":
case "argb":
case "saturate":
case "desaturate":
case "greyscale":
case "hsl":
case "hsla":
case "hue":
case "spin":
case "lighten":
case "darken":
case "fadein":
case "fadeout":
case "fade":
case "hsv":
case "hsva":
case "hsvhue":
case "contrast":
// color values has no unit
return "";
case "saturation":
case "lightness":
case "hsvsaturation":
case "hsvvalue":
case "luma":
case "luminance":
return "%";
case "if":
return get( 1 ).unit( formatter );
}
for( int i = 0; i < parameters.size(); i++ ) {
String unit = parameters.get( i ).unit( formatter );
if( !unit.isEmpty() ) {
return unit;
}
}
return "";
}
/**
* {@inheritDoc}
*/
@Override
public void appendTo( CssFormatter formatter ) {
try {
switch( super.toString() ) {
case "%":
format( formatter );
return;
case "escape":
escape( formatter );
return;
case "argb":
double color = getDouble( 0, formatter );
int argb = argb( color );
formatter.append( '#' );
formatter.appendHex( argb, 8 );
return;
case "svg-gradient":
UrlUtils.svgGradient( formatter, parameters );
return;
case "colorize-image":
CustomFunctions.colorizeImage( formatter, parameters );
return;
case "replace":
String str = get( 0 ).stringValue( formatter );
formatter.setInlineMode( true );
String pattern = get( 1 ).stringValue( formatter );
String replacement = get( 2 ).stringValue( formatter );
String flags = parameters.size() > 3 ? get( 3 ).stringValue( formatter ) : "";
formatter.setInlineMode( false );
if( str.length() > 1 ) {
char ch = str.charAt( 0 );
boolean quote = false;
if( ch == '\'' || ch == '\"' ) {
if( str.charAt( str.length() - 1 ) == ch ) {
str = str.substring( 1, str.length() - 1 );
quote = true;
}
}
str = new RegExp( pattern, flags ).replace( str, replacement );
if( quote ) {
str = ch + str + ch;
}
}
formatter.append( str );
return;
case "get-unit":
formatter.append( unit( formatter ) );
return;
case "url":
String url = get( 1 ).stringValue( formatter );
String urlStr = UrlUtils.removeQuote( url );
if( formatter.isRewriteUrl( urlStr ) ) {
try {
String relativeUrlStr = get( 0 ).stringValue( formatter );
URL relativeUrl = new URL( "file", null, relativeUrlStr );
relativeUrl = new URL( relativeUrl, urlStr );
boolean quote = url != urlStr;
urlStr = relativeUrl.getPath();
url = quote ? url.charAt( 0 ) + urlStr + url.charAt( 0 ) : urlStr;
} catch ( MalformedURLException ex ) {
// ignore, occur with data: protocol
}
}
formatter.append( "url(" );
formatter.append( url );
formatter.append( ")" );
return;
case "data-uri":
String baseUrl = get( 0 ).stringValue( formatter );
String type;
if( parameters.size() >= 3 ) {
type = get( 1 ).stringValue( formatter );
url = get( 2 ).stringValue( formatter );
} else {
type = null;
url = get( 1 ).stringValue( formatter );
}
UrlUtils.dataUri( formatter, baseUrl, url, type );
return;
case "extract":
Expression expr = extract( formatter );
if( expr != null ) {
expr.appendTo( formatter );
return;
}
break;
case "range":
range( formatter ).appendTo( formatter );
return;
case "calc":
formatter.append( super.toString() ).append( '(' );
SelectorUtils.appendToWithPlaceHolder( formatter, get( 0 ).stringValue( formatter ), 0, false, this );
formatter.append( ')' );
return;
case "if":
get( get( 0 ).booleanValue( formatter ) ? 1 : 2 ).appendTo( formatter );
return;
}
if( type == UNKNOWN ) {
eval( formatter );
}
if( type == STRING ) {
if( super.toString().equals( "" ) ) { //parenthesis
get( 0 ).appendTo( formatter );
} else {
appendToCssFunction( formatter );
}
return;
}
super.appendTo( formatter );
} catch ( Throwable th ) {
throw createException( th );
}
}
/**
* Write the function without change. We does not know it. It can/must be a CSS function.
* @param formatter the formatter
*/
private void appendToCssFunction( CssFormatter formatter ) {
formatter.append( super.toString() ).append( '(' );
for( int i=0; i0){
formatter.append( ',' ).space();
}
parameters.get(i).appendTo( formatter );
}
formatter.append( ')' );
}
/**
* Evaluate this function.
*
* @param formatter the current formation context
*/
private void eval( CssFormatter formatter ) {
try {
switch( super.toString().toLowerCase() ) {
case "": //parenthesis
if( parameters.size() > 1 ) {
throw ((LessObject)get( 0 )).createException( "Unrecognized input" );
}
evalParam( 0, formatter );
return;
case "percentage":
type = PERCENT;
doubleValue = getDouble( 0, formatter ) * 100;
return;
case "convert":
type = NUMBER;
String unit = get( 1 ).stringValue( formatter );
Expression param = get( 0 );
doubleValue = param.doubleValue( formatter ) * Operation.unitFactor( param.unit( formatter ), unit, false );
return;
case "abs":
type = getNumberDataType( formatter );
doubleValue = Math.abs( getDouble( 0, formatter ) );
return;
case "ceil":
type = getNumberDataType( formatter );
doubleValue = Math.ceil( getDouble( 0, formatter ) );
return;
case "floor":
type = getNumberDataType( formatter );
doubleValue = Math.floor( getDouble( 0, formatter ) );
return;
case "mod":
type = NUMBER;
doubleValue = getDouble( 0, formatter ) % getDouble( 1, formatter );
return;
case "pi":
type = NUMBER;
doubleValue = Math.PI;
return;
case "round":
type = getNumberDataType( formatter );
int decimalPlaces = getInt( 1, 0, formatter );
doubleValue = getDouble( 0, formatter );
for( int i = 0; i < decimalPlaces; i++ ) {
doubleValue *= 10;
}
doubleValue = Math.round( doubleValue );
for( int i = 0; i < decimalPlaces; i++ ) {
doubleValue /= 10;
}
return;
case "min":
type = NUMBER;
doubleValue = get( 0 ).doubleValue( formatter );
unit = unit( formatter );
for( int i = 1; i < parameters.size(); i++ ) {
param = parameters.get( i );
doubleValue = Math.min( doubleValue, param.doubleValue( formatter ) / Operation.unitFactor( unit, param.unit( formatter ), true ) );
}
return;
case "max":
type = NUMBER;
doubleValue = get( 0 ).doubleValue( formatter );
unit = unit( formatter );
for( int i = 1; i < parameters.size(); i++ ) {
param = parameters.get( i );
doubleValue = Math.max( doubleValue, param.doubleValue( formatter ) / Operation.unitFactor( unit, param.unit( formatter ), true ) );
}
return;
case "sqrt":
type = NUMBER;
doubleValue = Math.sqrt( getDouble( 0, formatter ) );
return;
case "pow":
type = NUMBER;
doubleValue = Math.pow( getDouble( 0, formatter ), getDouble( 1, formatter ) );
return;
case "sin":
type = NUMBER;
doubleValue = Math.sin( getRadians( formatter ) );
return;
case "cos":
type = NUMBER;
doubleValue = Math.cos( getRadians( formatter ) );
return;
case "tan":
type = NUMBER;
doubleValue = Math.tan( getRadians( formatter ) );
return;
case "acos":
type = NUMBER;
doubleValue = Math.acos( getRadians( formatter ) );
return;
case "asin":
type = NUMBER;
doubleValue = Math.asin( getRadians( formatter ) );
return;
case "atan":
type = NUMBER;
doubleValue = Math.atan( getRadians( formatter ) );
return;
case "increment":
type = NUMBER;
doubleValue = getDouble( 0, formatter ) + 1;
return;
case "add":
type = NUMBER;
doubleValue = getDouble( 0, formatter ) + getDouble( 1, formatter );
return;
case "length":
type = NUMBER;
doubleValue = getParamList( formatter ).size();
return;
case "extract":
extract( formatter );
return;
case "range":
type = LIST;
return;
case "alpha":
type = NUMBER;
switch( get( 0 ).getDataType( formatter ) ) {
case RGBA:
doubleValue = alpha( getDouble( 0, formatter ) );
break;
case COLOR:
doubleValue = 1;
break;
default:
type = STRING;
}
return;
case "red":
type = NUMBER;
doubleValue = red( getDouble( 0, formatter ) );
return;
case "green":
type = NUMBER;
doubleValue = green( getDouble( 0, formatter ) );
return;
case "blue":
type = NUMBER;
doubleValue = blue( getDouble( 0, formatter ) );
return;
case "rgba":
type = RGBA;
int r = getColorDigit( 0, formatter );
int g = getColorDigit( 1, formatter );
int b = getColorDigit( 2, formatter );
double a = getPercent( 3, formatter );
doubleValue = rgba( r, g, b, a );
return;
case "rgb":
type = COLOR;
r = getColorDigit( 0, formatter );
g = getColorDigit( 1, formatter );
b = getColorDigit( 2, formatter );
doubleValue = rgb( r, g, b );
return;
case "color":
param = get( 0 );
String str = UrlUtils.removeQuote( param.stringValue( formatter ) );
doubleValue = getColor( new ValueExpression( param, str ), formatter );
return;
case "argb":
type = STRING;
return;
case "saturate":
type = COLOR;
HSL hsl = toHSL( getDouble( 0, formatter ) );
hsl.s += getPercent( 1, formatter );
doubleValue = hsla( hsl );
return;
case "desaturate":
type = COLOR;
hsl = toHSL( getDouble( 0, formatter ) );
hsl.s -= getPercent( 1, formatter );
doubleValue = hsla( hsl );
return;
case "greyscale":
type = COLOR;
hsl = toHSL( getDouble( 0, formatter ) );
hsl.s = 0;
doubleValue = hsla( hsl );
return;
case "mix":
double c1 = getColor( 0, formatter );
double c2 = getColor( 1, formatter );
double weight = getPercent( 2, 0.5, formatter );
doubleValue = mix( c1, c2, weight );
return;
case "tint":
c1 = getColor( 0, formatter );
weight = getPercent( 1, 0.5, formatter );
doubleValue = mix( WHITE, c1, weight );
return;
case "shade":
c1 = getColor( 0, formatter );
weight = getPercent( 1, 0.5, formatter );
doubleValue = mix( BLACK, c1, weight );
return;
case "saturation":
type = PERCENT;
hsl = toHSL( getDouble( 0, formatter ) );
doubleValue = hsl.s * 100;
return;
case "hsl":
type = COLOR;
doubleValue = hsla( getDouble( 0, formatter ), getPercent( 1, formatter ), getPercent( 2, formatter ), 1 );
return;
case "hsla":
type = RGBA;
doubleValue = hsla( getDouble( 0, formatter ), getPercent( 1, formatter ), getPercent( 2, formatter ), getPercent( 3, formatter ) );
return;
case "hue":
type = NUMBER;
hsl = toHSL( getDouble( 0, formatter ) );
doubleValue = hsl.h;
return;
case "lightness":
type = PERCENT;
hsl = toHSL( getDouble( 0, formatter ) );
doubleValue = hsl.l * 100;
return;
case "spin":
type = COLOR;
hsl = toHSL( getDouble( 0, formatter ) );
hsl.h += getDouble( 1, formatter );
doubleValue = hsla( hsl );
return;
case "lighten":
hsl = toHSL( getColor( 0, formatter ) );
if (parameters.size() > 2 && "relative".equals( get( 2 ).stringValue( formatter )) ) {
hsl.l += hsl.l * getPercent(1, formatter);
} else {
hsl.l += getPercent(1, formatter);
}
doubleValue = hsla( hsl );
return;
case "darken":
hsl = toHSL( getColor( 0, formatter ) );
if (parameters.size() > 2 && "relative".equals( get( 2 ).stringValue( formatter )) ) {
hsl.l -= hsl.l * getPercent(1, formatter);
} else {
hsl.l -= getPercent(1, formatter);
}
doubleValue = hsla( hsl );
return;
case "fadein":
type = RGBA;
hsl = toHSL( getDouble( 0, formatter ) );
hsl.a += getPercent( 1, formatter );
doubleValue = hsla( hsl );
return;
case "fadeout":
type = RGBA;
hsl = toHSL( getDouble( 0, formatter ) );
hsl.a -= getPercent( 1, formatter );
doubleValue = hsla( hsl );
return;
case "fade":
type = RGBA;
hsl = toHSL( getDouble( 0, formatter ) );
hsl.a = getPercent( 1, formatter );
doubleValue = hsla( hsl );
return;
case "hsv":
type = COLOR;
doubleValue = hsva( getDouble( 0, formatter ), getPercent( 1, formatter ), getPercent( 2, formatter ), 1 );
return;
case "hsva":
type = RGBA;
doubleValue = hsva( getDouble( 0, formatter ), getPercent( 1, formatter ), getPercent( 2, formatter ), getPercent( 3, formatter ) );
return;
case "hsvhue":
doubleValue = toHSV( getColor( 0, formatter ) ).h;
type = NUMBER;
return;
case "hsvsaturation":
doubleValue = toHSV( getColor( 0, formatter ) ).s * 100;
type = PERCENT;
return;
case "hsvvalue":
doubleValue = toHSV( getColor( 0, formatter ) ).v * 100;
type = PERCENT;
return;
case "contrast":
double color = getColor( 0, formatter );
double dark = getDouble( 1, BLACK, formatter );
double light = getDouble( 2, WHITE, formatter );
double threshold = getPercent( 3, 0.43, formatter );
doubleValue = contrast( color, dark, light, threshold );
return;
case "luma":
color = getColor( 0, formatter );
type = PERCENT;
doubleValue = luma( color ) * 100;
return;
case "luminance":
color = getColor( 0, formatter );
type = PERCENT;
doubleValue = luminance( color ) * 100;
return;
case "multiply":
doubleValue = multiply( getColor( 0, formatter ), getColor( 1, formatter ) );
return;
case "screen":
doubleValue = screen( getColor( 0, formatter ), getColor( 1, formatter ) );
return;
case "overlay":
doubleValue = overlay( getColor( 0, formatter ), getColor( 1, formatter ) );
return;
case "softlight":
doubleValue = softlight( getColor( 0, formatter ), getColor( 1, formatter ) );
return;
case "hardlight":
doubleValue = hardlight( getColor( 0, formatter ), getColor( 1, formatter ) );
return;
case "difference":
doubleValue = difference( getColor( 0, formatter ), getColor( 1, formatter ) );
return;
case "exclusion":
doubleValue = exclusion( getColor( 0, formatter ), getColor( 1, formatter ) );
return;
case "average":
doubleValue = average( getColor( 0, formatter ), getColor( 1, formatter ) );
return;
case "negation":
doubleValue = negation( getColor( 0, formatter ), getColor( 1, formatter ) );
return;
case "unit":
type = NUMBER;
doubleValue = getDouble( 0, formatter );
return;
case "iscolor":
type = BOOLEAN;
int type0 = get( 0 ).getDataType( formatter );
booleanValue = type0 == COLOR || type0 == RGBA;
return;
case "isnumber":
type = BOOLEAN;
type0 = get( 0 ).getDataType( formatter );
booleanValue = type0 == NUMBER || type0 == PERCENT;
return;
case "isstring":
type = BOOLEAN;
booleanValue = get( 0 ).getDataType( formatter ) == STRING;
return;
case "iskeyword":
type = BOOLEAN;
param = get( 0 );
if( param.getDataType( formatter ) == STRING ) {
str = param.stringValue( formatter );
booleanValue = str == UrlUtils.removeQuote( str );
} else {
booleanValue = false;
}
return;
case "ispixel":
type = BOOLEAN;
param = get( 0 );
booleanValue = param.unit( formatter ).equals( "px" );
return;
case "isem":
type = BOOLEAN;
param = get( 0 );
booleanValue = param.unit( formatter ).equals( "em" );
return;
case "ispercentage":
type = BOOLEAN;
param = get( 0 );
booleanValue = param.unit( formatter ).equals( "%" );
return;
case "isunit":
type = BOOLEAN;
unit = get( 1 ).stringValue( formatter );
param = get( 0 );
booleanValue = param.unit( formatter ).equals( unit );
return;
case "if":
evalParam( get( 0 ).booleanValue( formatter ) ? 1 : 2, formatter );
return;
case "default":
if( formatter.isGuard() ) {
type = BOOLEAN;
booleanValue = formatter.getGuardDefault();
return;
}
break;
case "-":
type = get( 0 ).getDataType( formatter ) ;
doubleValue = -getDouble( 0, formatter );
return;
case "%":
case "escape":
type = STRING;
return;
}
if( super.toString().startsWith( "-" ) ) {
type = STRING;
return;
}
} catch( ParameterOutOfBoundsException ex ) {
// ignore and continue as CSS function
} catch (RuntimeException ex ) {
throw createException( ex );
}
type = STRING;
return;
}
/**
* Evaluate a parameter as this function.
*
* @param idx
* the index of the parameter starting with 0
* @param formatter
* the current formation context
*/
private void evalParam( int idx, CssFormatter formatter ) {
Expression expr = get( idx );
type = expr.getDataType( formatter );
switch( type ) {
case BOOLEAN:
booleanValue = expr.booleanValue( formatter );
break;
case STRING:
break;
default:
doubleValue = expr.doubleValue( formatter );
}
}
/**
* Implements the format function "%"
*
* @param formatter the current formation context
*/
private void format( CssFormatter formatter ) {
String fmt = get( 0 ).stringValue( formatter );
int idx = 1;
for( int i = 0; i < fmt.length(); i++ ) {
char ch = fmt.charAt( i );
if( ch == '%' ) {
ch = fmt.charAt( ++i );
switch( ch ){
case '%':
formatter.append( ch );
break;
case 'a':
case 'd':
get( idx++ ).appendTo( formatter );
break;
case 'A':
case 'D':
String str = get( idx++ ).stringValue( formatter );
try {
str = new URI( null, null, str, null ).getRawPath();
} catch( URISyntaxException e ) {
e.printStackTrace();
}
formatter.append( str );
break;
case 's':
formatter.setInlineMode( true );
get( idx++ ).appendTo( formatter );
formatter.setInlineMode( false );
break;
case 'S':
formatter.setInlineMode( true );
str = get( idx++ ).stringValue( formatter );
try {
str = new URI( null, null, str, null ).getRawPath();
} catch( URISyntaxException e ) {
e.printStackTrace();
}
formatter.append( str );
formatter.setInlineMode( false );
break;
default:
formatter.append( ch );
}
} else {
formatter.append( ch );
}
}
}
/**
* Implementation of the escape function: http://lesscss.org/functions/#string-functions-escape
*
* @param formatter
* current formatter
*/
private void escape( CssFormatter formatter ) {
String url = get( 0 ).stringValue( formatter );
url = UrlUtils.removeQuote( url );
for( int i = 0; i < url.length(); i++ ) {
char ch = url.charAt( i );
if( ch < 0x80 ) {
if( ch > ' ' ) {
switch( ch ){
case '#':
case '^':
case '(':
case ')':
case '{':
case '}':
case '|':
case ':':
case '>':
case '<':
case ';':
case '[':
case ']':
case '=':
break;
default:
formatter.append( ch );
continue;
}
}
formatter.append( '%' );
formatter.appendHex( ch, 2 );
} else {
byte[] bytes = String.valueOf( ch ).getBytes(StandardCharsets.UTF_8);
for( int j = 0; j < bytes.length; j++ ) {
formatter.append( '%' );
formatter.appendHex( bytes[j], 2 );
}
}
}
}
/**
* NUMBER or PERCENT as data type.
* @param formatter current formatter
* @return the type
*/
private int getNumberDataType( CssFormatter formatter ) {
if( get( 0).getDataType( formatter ) == PERCENT ) {
return PERCENT;
}
return NUMBER;
}
/**
* Get the idx parameter from the parameter list.
*
* @param idx
* the index starting with 0
* @return the expression
* @throws ParameterOutOfBoundsException if the parameter with the index does not exists
*/
Expression get( int idx ) {
if( parameters.size() <= idx ) {
throw new ParameterOutOfBoundsException();
}
return parameters.get( idx );
}
/**
* Get the idx parameter from the parameter list as color digit.
*
* @param idx
* the index starting with 0
* @param formatter
* current formatter
* @return the expression
*/
private int getColorDigit( int idx, CssFormatter formatter ) {
Expression expression = get( idx );
double d = expression.doubleValue( formatter );
if( expression.getDataType( formatter ) == PERCENT ) {
d *= 2.55;
}
return colorDigit(d);
}
/**
* Get the idx parameter from the parameter list as integer.
*
* @param idx
* the index starting with 0
* @param formatter
* current formatter
* @return the expression
*/
private int getInt( int idx, CssFormatter formatter ) {
return (int)get( idx ).doubleValue( formatter );
}
/**
* Get the idx parameter from the parameter list as a int value.
*
* @param idx
* the index starting with 0
* @param defaultValue
* the result if such a parameter idx does not exists.
* @param formatter
* current formatter
* @return the expression
*/
private int getInt( int idx, int defaultValue, CssFormatter formatter ) {
if( parameters.size() <= idx ) {
return defaultValue;
}
return (int)parameters.get( idx ).doubleValue( formatter );
}
/**
* Get the idx parameter from the parameter list as percent (range 0 - 1).
*
* @param idx
* the index starting with 0
* @param formatter
* current formatter
* @return the the percent value
*/
private double getPercent( int idx, CssFormatter formatter ) {
return ColorUtils.getPercent( get( idx ), formatter );
}
/**
* Get the idx parameter from the parameter list as percent (range 0 - 1).
*
* @param idx
* the index starting with 0
* @param defaultValue
* the result if such a parameter idx does not exists.
* @param formatter
* current formatter
* @return the the percent value
*/
private double getPercent( int idx, double defaultValue, CssFormatter formatter ) {
if( parameters.size() <= idx ) {
return defaultValue;
}
return ColorUtils.getPercent( get( idx ), formatter );
}
/**
* Get the idx parameter from the parameter list as color value. And set the type variable.
*
* @param idx
* the index starting with 0
* @param formatter
* current formatter
* @return the the color value
*/
private double getColor( int idx, CssFormatter formatter ) {
return getColor( get( idx ), formatter );
}
/**
* Get a color value from the expression. And set the type variable.
*
* @param exp
* the expression
* @param formatter
* current formatter
* @return the the color value
* @throws ParameterOutOfBoundsException if the parameter with the index does not exists
*/
private double getColor( Expression exp, CssFormatter formatter ) {
type = exp.getDataType( formatter );
switch( type ) {
case COLOR:
case RGBA:
return exp.doubleValue( formatter );
}
throw new ParameterOutOfBoundsException();
}
/**
* Get the value in radians.
* @param formatter the CSS formatter
* @return the radians
*/
double getRadians( CssFormatter formatter ) {
final Expression exp = get( 0 );
String unit = exp.unit( formatter );
return exp.doubleValue( formatter ) * Operation.unitFactor( unit, "rad", false );
}
/**
* Get the idx parameter from the parameter list as double.
*
* @param idx
* the index starting with 0
* @param formatter
* current formatter
* @return the expression
*/
private double getDouble( int idx, CssFormatter formatter ) {
return get( idx ).doubleValue( formatter );
}
/**
* Get the idx parameter from the parameter list as double.
*
* @param idx
* the index starting with 0
* @param defaultValue
* the result if such a parameter idx does not exists.
* @param formatter
* current formatter
* @return the expression
*/
private double getDouble( int idx, double defaultValue, CssFormatter formatter ) {
if( parameters.size() <= idx ) {
return defaultValue;
}
return parameters.get( idx ).doubleValue( formatter );
}
/**
* {@inheritDoc}
*/
@Override
public Operation listValue( CssFormatter formatter ) {
switch( super.toString() ) {
case "extract":
return extract( formatter ).listValue( formatter );
case "range":
return range( formatter );
}
return super.listValue( formatter );
}
/**
* Get for extract and length the first parameter as parameter list.
*
* @param formatter
* current formatter
* @return the list
*/
private List getParamList( CssFormatter formatter ) {
Expression ex0 = get( 0 ).unpack( formatter );
if( ex0.getDataType( formatter ) == LIST ) {
Operation op = ex0.listValue( formatter );
List operants = op.getOperands();
if( operants.size() == 1 ) {
Expression ex0_0 = operants.get( 0 );
if( ex0_0.getDataType( formatter ) == LIST ) {
return ex0_0.listValue( formatter ).getOperands();
}
}
return operants;
}
List result = new ArrayList();
result.add( ex0 );
return result;
}
/**
* Function extract. Change the type and doubleValue
* @param formatter current CSS output
* @return the extracted expression if it is a string
*/
private Expression extract( CssFormatter formatter ) {
List exList = getParamList( formatter );
int idx = getInt( 1, formatter );
if( idx <= 0 || exList.size() < idx ) {
type = STRING;
return null;
}
Expression ex = exList.get( idx - 1 );
type = ex.getDataType( formatter );
switch( type ) {
case STRING:
case LIST:
break;
default:
doubleValue = ex.doubleValue( formatter );
}
return ex;
}
/**
* Function range. Generate a list spanning a range of values
*
* @param formatter
* current CSS output
* @return The operation representing a list of values
*/
private Operation range( CssFormatter formatter ) {
type = LIST;
double start = get( 0 ).doubleValue( formatter );
double end;
if( parameters.size() >= 2 ) {
end = get( 1 ).doubleValue( formatter );
} else {
end = start;
start = 1;
}
double step;
if( parameters.size() >= 3 ) {
step = get( 2 ).doubleValue( formatter );
} else {
step = 1;
}
String unit = get( 0 ).unit( formatter );
Operation op = new Operation( this, ' ' );
while( start <= end ) {
op.addOperand( new ValueExpression( this, start + unit ) );
start += step;
}
return op;
}
}
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