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/**
* MIT License (MIT)
*
* Copyright (c) 2014 - 2015 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 java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.Nonnull;
import javax.xml.bind.DatatypeConverter;
/**
* Implementation of the function svg-Gradient and other URL utils.
*/
class UrlUtils {
/**
* Remove a quote if exists.
* @param str a string
* @return the str without quotes
*/
static @Nonnull String removeQuote( @Nonnull String str ) {
if( str.length() > 1 ) {
char ch = str.charAt( 0 );
if( ch == '\'' || ch == '\"' ) {
if( str.charAt( str.length() - 1 ) == ch ) {
return str.substring( 1, str.length() - 1 );
}
}
}
return str;
}
/**
* Implementation of the function svg-Gradient
*/
static void svgGradient( CssFormatter formatter, List parameters ) {
if( parameters.size() < 3 ) {
throw new LessException( "error evaluating function `svg-gradient expects direction, start_color [start_position], [color position,]..., end_color " );
}
String direction = parameters.get( 0 ).stringValue( formatter );
String gradientType = "linear";
String rectangleDimension = "x=\"0\" y=\"0\" width=\"1\" height=\"1\"";
String gradientDirection;
switch( direction ) {
case "to bottom":
gradientDirection = "x1=\"0%\" y1=\"0%\" x2=\"0%\" y2=\"100%\"";
break;
case "to right":
gradientDirection = "x1=\"0%\" y1=\"0%\" x2=\"100%\" y2=\"0%\"";
break;
case "to bottom right":
gradientDirection = "x1=\"0%\" y1=\"0%\" x2=\"100%\" y2=\"100%\"";
break;
case "to top right":
gradientDirection = "x1=\"0%\" y1=\"100%\" x2=\"100%\" y2=\"0%\"";
break;
case "ellipse":
case "ellipse at center":
gradientType = "radial";
gradientDirection = "cx=\"50%\" cy=\"50%\" r=\"75%\"";
rectangleDimension = "x=\"-50\" y=\"-50\" width=\"101\" height=\"101\"";
break;
default:
throw new LessException( "error evaluating function `svg-gradient`: svg-gradient direction must be 'to bottom', 'to right', 'to bottom right', 'to top right' or 'ellipse at center'" );
}
StringBuilder builder = new StringBuilder( "" );
byte[] bytes = builder.toString().getBytes( StandardCharsets.UTF_8 );
formatter.append( "url('data:image/svg+xml;base64," );
formatter.append( DatatypeConverter.printBase64Binary( bytes ) );
formatter.append( "\')" );
}
/**
* Get the color value of the expression or fire an exception if not a color.
*/
static double getColor( Expression param, CssFormatter formatter ) {
switch( param.getDataType( formatter ) ) {
case Expression.COLOR:
case Expression.RGBA:
return param.doubleValue( formatter );
}
throw new LessException( "Not a color: " + param );
}
static void dataUri( CssFormatter formatter, String relativeURL, final String urlString, String type ) throws IOException {
URL url = new URL( formatter.getBaseURL(), relativeURL );
String urlStr = removeQuote( urlString );
url = new URL( url, urlStr );
InputStream input;
try {
input = url.openStream();
} catch( Exception e ) {
formatter.append( "url(" ).append( urlString ).append( ')' );
return;
}
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
int count;
byte[] data = new byte[16384];
while( (count = input.read( data, 0, data.length )) > 0 ) {
buffer.write( data, 0, count );
}
input.close();
byte[] bytes = buffer.toByteArray();
if( bytes.length >= 32 * 1024 ) {
formatter.append( "url(" ).append( urlString ).append( ')' );
} else {
dataUri( formatter, bytes, urlStr, type );
}
}
static void dataUri( CssFormatter formatter, byte[] bytes, String urlStr, String type ) {
if( type == null ) {
switch( urlStr.substring( urlStr.lastIndexOf( '.' ) + 1 ) ) {
case "gif":
type = "image/gif;base64";
break;
case "png":
type = "image/png;base64";
break;
case "jpg":
case "jpeg":
type = "image/jpeg;base64";
break;
default:
type = "text/html";
}
} else {
type = removeQuote( type );
}
if( type.endsWith( "base64" ) ) {
formatter.append( "url(\"data:" ).append( type ).append( ',' );
formatter.append( DatatypeConverter.printBase64Binary( bytes ) );
formatter.append( "\")" );
} else {
formatter.append( "url(\"data:" ).append( type ).append( ',' );
appendEncode( formatter, bytes );
formatter.append( "\")" );
}
}
private static void appendEncode( CssFormatter formatter, byte[] bytes ) {
for( byte b : bytes ) {
if ((b >= 'a' && b <= 'z' ) || (b >= 'A' && b <= 'Z' ) || (b >= '0' && b <= '9' )) {
formatter.append( (char )b );
} else {
switch( b ) {
case '-':
case '_':
case '*':
case '.':
formatter.append( (char )b );
break;
default:
formatter.append( '%' );
formatter.append( Character.toUpperCase( Character.forDigit((b >> 4) & 0xF, 16) ) );
formatter.append( Character.toUpperCase( Character.forDigit(b & 0xF, 16) ) );
}
}
}
}
}
