Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/**
* 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.*;
/**
* Base expression with value formating.
*/
abstract class Expression extends LessObject implements Formattable {
static final int UNKNOWN = 0;
static final int BOOLEAN = 1;
static final int NUMBER = 2;
static final int PERCENT = 3;
static final int RGBA = 4;
static final int COLOR = 5;
static final int STRING = 6;
static final int LIST = 7;
static final int RULESET = 8;
// A color alpha value of 1 as long mask.
static final long ALPHA_1 = 0xFFFF_0000_0000_0000L;
static final double WHITE = Double.longBitsToDouble( ALPHA_1 | 0xFF00_FF00_FF00L );
static final double BLACK = Double.longBitsToDouble( ALPHA_1 );
private String str;
private boolean important;
/**
* Create a new instance.
*
* @param obj
* another LessObject with parse position.
* @param str
* a string from the parser
*/
Expression( LessObject obj, String str ) {
super( obj );
this.str = str;
}
/**
* {@inheritDoc}
*/
@Override
public final int getType() {
return EXPRESSION;
}
/**
* {@inheritDoc}
*/
@Override
public void prepare( CssFormatter formatter ) {
// nothing
}
/**
* {@inheritDoc}
*/
@Override
public void appendTo( CssFormatter formatter ) {
switch( getDataType( formatter ) ) {
case BOOLEAN:
formatter.append( Boolean.toString( booleanValue( formatter ) ) );
return;
case PERCENT:
double d = doubleValue( formatter );
formatter.append( d );
formatter.append( '%' );
return;
case NUMBER:
d = doubleValue( formatter );
formatter.appendValue( d, unit( formatter ) );
return;
case COLOR:
formatter.appendColor( doubleValue( formatter ), null );
return;
case RGBA:
double color = doubleValue( formatter );
if( color == 0 && Double.doubleToRawLongBits( color ) == 0 ) {
formatter.append( "transparent" );
} else {
final double alpha = alpha( color );
if( alpha >= 1 ) {
formatter.appendColor( color, null );
} else {
formatter.append( "rgba(" );
formatter.append( red( color ) ).append( ',' ).space();
formatter.append( green( color ) ).append( ',' ).space();
formatter.append( blue( color ) ).append( ',' ).space();
formatter.append( alpha ).append( ')' );
}
}
return;
}
formatter.append( str );
}
/**
* The data type of the expression
*
* @param formatter
* the CCS target
*
* @return one of the constant
*/
abstract int getDataType( CssFormatter formatter );
/**
* Get the numeric value.
*
* @param formatter
* the CCS target
* @return the value
*/
abstract double doubleValue( CssFormatter formatter );
/**
* Get the boolean value
*
* @param formatter
* the CCS target
* @return the value
*/
abstract boolean booleanValue( CssFormatter formatter );
/**
* Get the string value
*
* @param formatter
* the CCS target
* @return the value
*/
String stringValue( CssFormatter formatter ) {
String str;
try {
formatter.addOutput();
appendTo( formatter );
} catch( Exception ex ) {
throw createException( ex );
} finally {
str = formatter.releaseOutput();
}
return str;
}
/**
* If this expression is mark as important
* @return true, if important
*/
boolean isImportant() {
return important;
}
/**
* Enable the important flag.
*/
void setImportant() {
important = true;
}
/**
* Get the value as a list
*
* @param formatter
* the CCS target
* @return the value
*/
public Operation listValue( CssFormatter formatter ) {
Expression expr = unpack( formatter );
if( expr == this ) {
throw createException( "Exprestion is not a list: " + this );
}
return expr.listValue( formatter );
}
/**
* Get the unit of a NUMBER value.
*
* @param formatter
* the CCS target
* @return the unit or empty string if nothing
*/
abstract String unit( CssFormatter formatter );
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return str;
}
/**
* Unpack this expression to return the core expression
* @param formatter the CCS target
* @return the core expression
*/
Expression unpack( CssFormatter formatter ) {
Expression unpack = this;
do { // unpack packed expressions like parenthesis or variables
if( unpack.getClass() == FunctionExpression.class && ((FunctionExpression)unpack).toString().isEmpty() ) { //Parenthesis
unpack = ((FunctionExpression)unpack).get( 0 );
continue;
}
if( unpack.getClass() == VariableExpression.class ) {
unpack = ((VariableExpression)unpack).getValue( formatter );
continue;
}
break;
} while(true);
return unpack;
}
}
