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* CSSJanus. https://www.mediawiki.org/wiki/CSSJanus
*
* Copyright 2014 Trevor Parscal
* Copyright 2010 Roan Kattouw
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var cssjanus;
/**
* Create a tokenizer object.
*
* This utility class is used by CSSJanus to protect strings by replacing them temporarily with
* tokens and later transforming them back.
*
* @class
* @constructor
* @param {RegExp} regex Regular expression whose matches to replace by a token
* @param {string} token Placeholder text
*/
function Tokenizer( regex, token ) {
var matches = [],
index = 0;
/**
* Add a match.
*
* @private
* @param {string} match Matched string
* @return {string} Token to leave in the matched string's place
*/
function tokenizeCallback( match ) {
matches.push( match );
return token;
}
/**
* Get a match.
*
* @private
* @return {string} Original matched string to restore
*/
function detokenizeCallback() {
return matches[ index++ ];
}
return {
/**
* Replace matching strings with tokens.
*
* @param {string} str String to tokenize
* @return {string} Tokenized string
*/
tokenize: function ( str ) {
return str.replace( regex, tokenizeCallback );
},
/**
* Restores tokens to their original values.
*
* @param {string} str String previously run through tokenize()
* @return {string} Original string
*/
detokenize: function ( str ) {
return str.replace( new RegExp( '(' + token + ')', 'g' ), detokenizeCallback );
}
};
}
/**
* Create a CSSJanus object.
*
* CSSJanus transforms CSS rules with horizontal relevance so that a left-to-right stylesheet can
* become a right-to-left stylesheet automatically. Processing can be bypassed for an entire rule
* or a single property by adding a / * @noflip * / comment above the rule or property.
*
* @class
* @constructor
*/
function CSSJanus() {
var
// Tokens
temporaryToken = '`TMP`',
temporaryLtrToken = '`TMPLTR`',
temporaryRtlToken = '`TMPRTL`',
noFlipSingleToken = '`NOFLIP_SINGLE`',
noFlipClassToken = '`NOFLIP_CLASS`',
commentToken = '`COMMENT`',
// Patterns
nonAsciiPattern = '[^\\u0020-\\u007e]',
unicodePattern = '(?:(?:\\\\[0-9a-f]{1,6})(?:\\r\\n|\\s)?)',
numPattern = '(?:[0-9]*\\.[0-9]+|[0-9]+)',
unitPattern = '(?:em|ex|px|cm|mm|in|pt|pc|deg|rad|grad|ms|s|hz|khz|%)',
directionPattern = 'direction\\s*:\\s*',
urlSpecialCharsPattern = '[!#$%&*-~]',
validAfterUriCharsPattern = '[\'"]?\\s*',
nonLetterPattern = '(^|[^a-zA-Z])',
charsWithinSelectorPattern = '[^\\}]*?',
noFlipPattern = '\\/\\*\\!?\\s*@noflip\\s*\\*\\/',
commentPattern = '\\/\\*[^*]*\\*+([^\\/*][^*]*\\*+)*\\/',
escapePattern = '(?:' + unicodePattern + '|\\\\[^\\r\\n\\f0-9a-f])',
nmstartPattern = '(?:[_a-z]|' + nonAsciiPattern + '|' + escapePattern + ')',
nmcharPattern = '(?:[_a-z0-9-]|' + nonAsciiPattern + '|' + escapePattern + ')',
identPattern = '-?' + nmstartPattern + nmcharPattern + '*',
quantPattern = numPattern + '(?:\\s*' + unitPattern + '|' + identPattern + ')?',
signedQuantPattern = '((?:-?' + quantPattern + ')|(?:inherit|auto))',
signedQuantSimplePattern = '(?:-?' + numPattern + '(?:\\s*' + unitPattern + ')?)',
mathOperatorsPattern = '(?:\\+|\\-|\\*|\\/)',
allowedCharsPattern = '(?:\\(|\\)|\\t| )',
calcEquationPattern = '(?:' + allowedCharsPattern + '|' + signedQuantSimplePattern + '|' + mathOperatorsPattern + '){3,}',
calcPattern = '(?:calc\\((?:' + calcEquationPattern + ')\\))',
signedQuantCalcPattern = '((?:-?' + quantPattern + ')|(?:inherit|auto)|' + calcPattern + ')',
fourNotationQuantPropsPattern = '((?:margin|padding|border-width)\\s*:\\s*)',
fourNotationColorPropsPattern = '((?:-color|border-style)\\s*:\\s*)',
colorPattern = '(#?' + nmcharPattern + '+|(?:rgba?|hsla?)\\([ \\d.,%-]+\\))',
// The use of a lazy match ("*?") may cause a backtrack limit to be exceeded before finding
// the intended match. This affects 'urlCharsPattern' and 'lookAheadNotOpenBracePattern'.
// We have not yet found this problem on Node.js, but we have on PHP 7, where it was
// mitigated by using a possessive quantifier ("*+"), which are not supported in JS.
// See <https://phabricator.wikimedia.org/T215746#4944830>.
urlCharsPattern = '(?:' + urlSpecialCharsPattern + '|' + nonAsciiPattern + '|' + escapePattern + ')*?',
lookAheadNotLetterPattern = '(?![a-zA-Z])',
lookAheadNotOpenBracePattern = '(?!(' + nmcharPattern + '|\\r?\\n|\\s|#|\\:|\\.|\\,|\\+|>|~|\\(|\\)|\\[|\\]|=|\\*=|~=|\\^=|\'[^\']*\'|"[^"]*"|' + commentToken + ')*?{)',
lookAheadNotClosingParenPattern = '(?!' + urlCharsPattern + validAfterUriCharsPattern + '\\))',
lookAheadForClosingParenPattern = '(?=' + urlCharsPattern + validAfterUriCharsPattern + '\\))',
suffixPattern = '(\\s*(?:!important\\s*)?[;}])',
// Regular expressions
temporaryTokenRegExp = /`TMP`/g,
temporaryLtrTokenRegExp = /`TMPLTR`/g,
temporaryRtlTokenRegExp = /`TMPRTL`/g,
commentRegExp = new RegExp( commentPattern, 'gi' ),
noFlipSingleRegExp = new RegExp( '(' + noFlipPattern + lookAheadNotOpenBracePattern + '[^;}]+;?)', 'gi' ),
noFlipClassRegExp = new RegExp( '(' + noFlipPattern + charsWithinSelectorPattern + '})', 'gi' ),
directionLtrRegExp = new RegExp( '(' + directionPattern + ')ltr', 'gi' ),
directionRtlRegExp = new RegExp( '(' + directionPattern + ')rtl', 'gi' ),
leftRegExp = new RegExp( nonLetterPattern + '(left)' + lookAheadNotLetterPattern + lookAheadNotClosingParenPattern + lookAheadNotOpenBracePattern, 'gi' ),
rightRegExp = new RegExp( nonLetterPattern + '(right)' + lookAheadNotLetterPattern + lookAheadNotClosingParenPattern + lookAheadNotOpenBracePattern, 'gi' ),
leftInUrlRegExp = new RegExp( nonLetterPattern + '(left)' + lookAheadForClosingParenPattern, 'gi' ),
rightInUrlRegExp = new RegExp( nonLetterPattern + '(right)' + lookAheadForClosingParenPattern, 'gi' ),
ltrDirSelector = /(:dir\( *)ltr( *\))/g,
rtlDirSelector = /(:dir\( *)rtl( *\))/g,
ltrInUrlRegExp = new RegExp( nonLetterPattern + '(ltr)' + lookAheadForClosingParenPattern, 'gi' ),
rtlInUrlRegExp = new RegExp( nonLetterPattern + '(rtl)' + lookAheadForClosingParenPattern, 'gi' ),
cursorEastRegExp = new RegExp( nonLetterPattern + '([ns]?)e-resize', 'gi' ),
cursorWestRegExp = new RegExp( nonLetterPattern + '([ns]?)w-resize', 'gi' ),
fourNotationQuantRegExp = new RegExp( fourNotationQuantPropsPattern + signedQuantCalcPattern + '(\\s+)' + signedQuantCalcPattern + '(\\s+)' + signedQuantCalcPattern + '(\\s+)' + signedQuantCalcPattern + suffixPattern, 'gi' ),
fourNotationColorRegExp = new RegExp( fourNotationColorPropsPattern + colorPattern + '(\\s+)' + colorPattern + '(\\s+)' + colorPattern + '(\\s+)' + colorPattern + suffixPattern, 'gi' ),
bgHorizontalPercentageRegExp = new RegExp( '(background(?:-position)?\\s*:\\s*(?:[^:;}\\s]+\\s+)*?)(' + quantPattern + ')', 'gi' ),
bgHorizontalPercentageXRegExp = new RegExp( '(background-position-x\\s*:\\s*)(-?' + numPattern + '%)', 'gi' ),
// border-radius: <length or percentage>{1,4} [optional: / <length or percentage>{1,4} ]
borderRadiusRegExp = new RegExp( '(border-radius\\s*:\\s*)' + signedQuantPattern + '(?:(?:\\s+' + signedQuantPattern + ')(?:\\s+' + signedQuantPattern + ')?(?:\\s+' + signedQuantPattern + ')?)?' +
'(?:(?:(?:\\s*\\/\\s*)' + signedQuantPattern + ')(?:\\s+' + signedQuantPattern + ')?(?:\\s+' + signedQuantPattern + ')?(?:\\s+' + signedQuantPattern + ')?)?' + suffixPattern, 'gi' ),
boxShadowRegExp = new RegExp( '(box-shadow\\s*:\\s*(?:inset\\s*)?)' + signedQuantPattern, 'gi' ),
textShadow1RegExp = new RegExp( '(text-shadow\\s*:\\s*)' + signedQuantPattern + '(\\s*)' + colorPattern, 'gi' ),
textShadow2RegExp = new RegExp( '(text-shadow\\s*:\\s*)' + colorPattern + '(\\s*)' + signedQuantPattern, 'gi' ),
textShadow3RegExp = new RegExp( '(text-shadow\\s*:\\s*)' + signedQuantPattern, 'gi' ),
translateXRegExp = new RegExp( '(transform\\s*:[^;}]*)(translateX\\s*\\(\\s*)' + signedQuantPattern + '(\\s*\\))', 'gi' ),
translateRegExp = new RegExp( '(transform\\s*:[^;}]*)(translate\\s*\\(\\s*)' + signedQuantPattern + '((?:\\s*,\\s*' + signedQuantPattern + '){0,2}\\s*\\))', 'gi' );
/**
* Invert the horizontal value of a background position property.
*
* @private
* @param {string} match Matched property
* @param {string} pre Text before value
* @param {string} value Horizontal value
* @return {string} Inverted property
*/
function calculateNewBackgroundPosition( match, pre, value ) {
var idx, len;
if ( value.slice( -1 ) === '%' ) {
idx = value.indexOf( '.' );
if ( idx !== -1 ) {
// Two off, one for the "%" at the end, one for the dot itself
len = value.length - idx - 2;
value = 100 - parseFloat( value );
value = value.toFixed( len ) + '%';
} else {
value = 100 - parseFloat( value ) + '%';
}
}
return pre + value;
}
/**
* Invert a set of border radius values.
*
* @private
* @param {Array} values Matched values
* @return {string} Inverted values
*/
function flipBorderRadiusValues( values ) {
switch ( values.length ) {
case 4:
values = [ values[ 1 ], values[ 0 ], values[ 3 ], values[ 2 ] ];
break;
case 3:
values = [ values[ 1 ], values[ 0 ], values[ 1 ], values[ 2 ] ];
break;
case 2:
values = [ values[ 1 ], values[ 0 ] ];
break;
case 1:
values = [ values[ 0 ] ];
break;
}
return values.join( ' ' );
}
/**
* Invert a set of border radius values.
*
* @private
* @param {string} match Matched property
* @param {string} pre Text before value
* @param {string} [firstGroup1]
* @param {string} [firstGroup2]
* @param {string} [firstGroup3]
* @param {string} [firstGroup4]
* @param {string} [secondGroup1]
* @param {string} [secondGroup2]
* @param {string} [secondGroup3]
* @param {string} [secondGroup4]
* @param {string} [post] Text after value
* @return {string} Inverted property
*/
function calculateNewBorderRadius( match, pre ) {
var values,
args = [].slice.call( arguments ),
firstGroup = args.slice( 2, 6 ).filter( function ( val ) {
return val;
} ),
secondGroup = args.slice( 6, 10 ).filter( function ( val ) {
return val;
} ),
post = args[ 10 ] || '';
if ( secondGroup.length ) {
values = flipBorderRadiusValues( firstGroup ) + ' / ' + flipBorderRadiusValues( secondGroup );
} else {
values = flipBorderRadiusValues( firstGroup );
}
return pre + values + post;
}
/**
* Flip the sign of a CSS value, possibly with a unit.
*
* We can't just negate the value with unary minus due to the units.
*
* @private
* @param {string} value
* @return {string}
*/
function flipSign( value ) {
if ( parseFloat( value ) === 0 ) {
// Don't mangle zeroes
return value;
}
if ( value[ 0 ] === '-' ) {
return value.slice( 1 );
}
return '-' + value;
}
/**
* @private
* @param {string} match
* @param {string} property
* @param {string} offset
* @return {string}
*/
function calculateNewShadow( match, property, offset ) {
return property + flipSign( offset );
}
/**
* @private
* @param {string} match
* @param {string} property
* @param {string} prefix
* @param {string} offset
* @param {string} suffix
* @return {string}
*/
function calculateNewTranslate( match, property, prefix, offset, suffix ) {
return property + prefix + flipSign( offset ) + suffix;
}
/**
* @private
* @param {string} match
* @param {string} property
* @param {string} color
* @param {string} space
* @param {string} offset
* @return {string}
*/
function calculateNewFourTextShadow( match, property, color, space, offset ) {
return property + color + space + flipSign( offset );
}
return {
/**
* Transform a left-to-right stylesheet to right-to-left.
*
* @param {string} css Stylesheet to transform
* @param {Object} options Options
* @param {boolean} [options.transformDirInUrl=false] Transform directions in URLs
* (e.g. 'ltr', 'rtl')
* @param {boolean} [options.transformEdgeInUrl=false] Transform edges in URLs
* (e.g. 'left', 'right')
* @return {string} Transformed stylesheet
*/
'transform': function ( css, options ) { // eslint-disable-line quote-props
// Use single quotes in this object literal key for closure compiler.
// Tokenizers
var noFlipSingleTokenizer = new Tokenizer( noFlipSingleRegExp, noFlipSingleToken ),
noFlipClassTokenizer = new Tokenizer( noFlipClassRegExp, noFlipClassToken ),
commentTokenizer = new Tokenizer( commentRegExp, commentToken );
// Tokenize
css = commentTokenizer.tokenize(
noFlipClassTokenizer.tokenize(
noFlipSingleTokenizer.tokenize(
// We wrap tokens in ` , not ~ like the original implementation does.
// This was done because ` is not a legal character in CSS and can only
// occur in URLs, where we escape it to %60 before inserting our tokens.
css.replace( '`', '%60' )
)
)
);
// Transform URLs
if ( options.transformDirInUrl ) {
// Replace 'ltr' with 'rtl' and vice versa in background URLs
css = css
.replace( ltrDirSelector, '$1' + temporaryLtrToken + '$2' )
.replace( rtlDirSelector, '$1' + temporaryRtlToken + '$2' )
.replace( ltrInUrlRegExp, '$1' + temporaryToken )
.replace( rtlInUrlRegExp, '$1ltr' )
.replace( temporaryTokenRegExp, 'rtl' )
.replace( temporaryLtrTokenRegExp, 'ltr' )
.replace( temporaryRtlTokenRegExp, 'rtl' );
}
if ( options.transformEdgeInUrl ) {
// Replace 'left' with 'right' and vice versa in background URLs
css = css
.replace( leftInUrlRegExp, '$1' + temporaryToken )
.replace( rightInUrlRegExp, '$1left' )
.replace( temporaryTokenRegExp, 'right' );
}
// Transform rules
css = css
// Replace direction: ltr; with direction: rtl; and vice versa.
.replace( directionLtrRegExp, '$1' + temporaryToken )
.replace( directionRtlRegExp, '$1ltr' )
.replace( temporaryTokenRegExp, 'rtl' )
// Flip rules like left: , padding-right: , etc.
.replace( leftRegExp, '$1' + temporaryToken )
.replace( rightRegExp, '$1left' )
.replace( temporaryTokenRegExp, 'right' )
// Flip East and West in rules like cursor: nw-resize;
.replace( cursorEastRegExp, '$1$2' + temporaryToken )
.replace( cursorWestRegExp, '$1$2e-resize' )
.replace( temporaryTokenRegExp, 'w-resize' )
// Border radius
.replace( borderRadiusRegExp, calculateNewBorderRadius )
// Shadows
.replace( boxShadowRegExp, calculateNewShadow )
.replace( textShadow1RegExp, calculateNewFourTextShadow )
.replace( textShadow2RegExp, calculateNewFourTextShadow )
.replace( textShadow3RegExp, calculateNewShadow )
// Translate
.replace( translateXRegExp, calculateNewTranslate )
.replace( translateRegExp, calculateNewTranslate )
// Swap the second and fourth parts in four-part notation rules
// like padding: 1px 2px 3px 4px;
.replace( fourNotationQuantRegExp, '$1$2$3$8$5$6$7$4$9' )
.replace( fourNotationColorRegExp, '$1$2$3$8$5$6$7$4$9' )
// Flip horizontal background percentages
.replace( bgHorizontalPercentageRegExp, calculateNewBackgroundPosition )
.replace( bgHorizontalPercentageXRegExp, calculateNewBackgroundPosition );
// Detokenize
css = noFlipSingleTokenizer.detokenize(
noFlipClassTokenizer.detokenize(
commentTokenizer.detokenize( css )
)
);
return css;
}
};
}
/* Initialization */
cssjanus = new CSSJanus();
/* Exports */
Eif ( typeof module !== 'undefined' && module.exports ) {
/**
* Transform a left-to-right stylesheet to right-to-left.
*
* This function is a static wrapper around the transform method of an instance of CSSJanus.
*
* @param {string} css Stylesheet to transform
* @param {Object|boolean} [options] Options object, or transformDirInUrl option (back-compat)
* @param {boolean} [options.transformDirInUrl=false] Transform directions in URLs
* (e.g. 'ltr', 'rtl')
* @param {boolean} [options.transformEdgeInUrl=false] Transform edges in URLs
* (e.g. 'left', 'right')
* @param {boolean} [transformEdgeInUrl] Back-compat parameter
* @return {string} Transformed stylesheet
*/
exports.transform = function ( css, options, transformEdgeInUrl ) {
var norm;
if ( typeof options === 'object' ) {
norm = options;
} else {
norm = {};
Eif ( typeof options === 'boolean' ) {
norm.transformDirInUrl = options;
}
Eif ( typeof transformEdgeInUrl === 'boolean' ) {
norm.transformEdgeInUrl = transformEdgeInUrl;
}
}
return cssjanus.transform( css, norm );
};
} else if ( typeof window !== 'undefined' ) {
/* global window */
// Allow cssjanus to be used in a browser.
// eslint-disable-next-line dot-notation
window[ 'cssjanus' ] = cssjanus;
}
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