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* UnicodeJS Grapheme Break module
*
* Implementation of Unicode 15.0.0 Default Grapheme Cluster Boundary Specification
* http://www.unicode.org/reports/tr29/#Default_Grapheme_Cluster_Table
*
* @copyright 2013–2018 UnicodeJS team and others; see AUTHORS.txt
* @license The MIT License (MIT); see LICENSE.txt
*/
( function () {
var properties = unicodeJS.graphemebreakproperties,
emojiProperties = unicodeJS.emojiproperties,
/**
* @namespace unicodeJS.graphemebreak
*/
graphemebreak = unicodeJS.graphemebreak = {},
patterns = {};
var property;
// build regexes
for ( property in properties ) {
// eslint-disable-next-line security/detect-non-literal-regexp
patterns[ property ] = new RegExp(
unicodeJS.charRangeArrayRegexp( properties[ property ] )
);
}
for ( property in emojiProperties ) {
// eslint-disable-next-line security/detect-non-literal-regexp
patterns[ property ] = new RegExp(
unicodeJS.charRangeArrayRegexp( emojiProperties[ property ] )
);
}
function getProperty( codepoint ) {
for ( property in patterns ) {
if ( patterns[ property ].test( codepoint ) ) {
return property;
}
}
return null;
}
/**
* Split text into grapheme clusters
*
* @memberof unicodeJS.graphemebreak
* @param {string} text Text to split
* @return {string[]} Split text
*/
graphemebreak.splitClusters = function ( text ) {
return text.split( /(?![\uDC00-\uDFFF])/g ).reduce( function ( clusters, codepoint, i, codepoints ) {
function isBreak() {
var lft = [];
// Break at the start and end of text, unless the text is empty.
// GB1: sot ÷ Any
// GB2: Any ÷ eot
if ( i === 0 || i === codepoints.length ) {
return true;
}
lft.push( getProperty( codepoints[ i - 1 ] ) );
// No rules currently require us to look ahead.
var rgt = getProperty( codepoint );
// Do not break between a CR and LF. Otherwise, break before and after controls.
// GB3: CR × LF
if ( lft[ 0 ] === 'CR' && rgt === 'LF' ) {
return false;
}
// GB4: ( Control | CR | LF ) ÷
// GB5: ÷ ( Control | CR | LF )
if (
[ 'Control', 'CR', 'LF' ].indexOf( lft[ 0 ] ) !== -1 ||
[ 'Control', 'CR', 'LF' ].indexOf( rgt ) !== -1
) {
return true;
}
// Do not break Hangul syllable sequences.
// GB6: L × ( L | V | LV | LVT )
if (
lft[ 0 ] === 'L' &&
[ 'L', 'V', 'LV', 'LVT' ].indexOf( rgt ) !== -1
) {
return false;
}
// GB7: ( LV | V ) × ( V | T )
if (
[ 'LV', 'V' ].indexOf( lft[ 0 ] ) !== -1 &&
[ 'V', 'T' ].indexOf( rgt ) !== -1
) {
return false;
}
// GB8: ( LVT | T ) × T
if (
[ 'LVT', 'T' ].indexOf( lft[ 0 ] ) !== -1 &&
rgt === 'T'
) {
return false;
}
// Do not break before extending characters or ZWJ.
// GB9 × ( Extend | ZWJ )
// The GB9a and GB9b rules only apply to extended grapheme clusters:
// Do not break before SpacingMarks, or after Prepend characters.
// GB9a: × SpacingMark
if ( [ 'Extend', 'ZWJ', 'SpacingMark' ].indexOf( rgt ) !== -1 ) {
return false;
}
// GB9b: Prepend ×
if ( lft[ 0 ] === 'Prepend' ) {
return false;
}
// Do not break within emoji modifier sequences or emoji zwj sequences.
// GB11: \p{Extended_Pictographic} Extend* ZWJ × \p{Extended_Pictographic}
var l = 0;
if ( rgt === 'ExtendedPictographic' ) {
if ( lft[ l ] === 'ZWJ' ) {
l++;
lft[ l ] = getProperty( codepoints[ i - 1 - l ] );
while ( lft[ l ] === 'Extend' ) {
l++;
lft[ l ] = getProperty( codepoints[ i - 1 - l ] );
}
if ( lft[ l ] === 'ExtendedPictographic' ) {
return false;
}
}
}
// Do not break within emoji flag sequences. That is, do not break between regional indicator (RI) symbols if there is an odd number of RI characters before the break point.
// GB12: sot (RI RI)* RI × RI
// GB13: [^RI] (RI RI)* RI × RI
l = 0;
while ( lft[ l ] === 'RegionalIndicator' ) {
l++;
lft[ l ] = getProperty( codepoints[ i - 1 - l ] );
}
if ( rgt === 'RegionalIndicator' && l % 2 === 1 ) {
return false;
}
// Otherwise, break everywhere.
// GB999: Any ÷ Any
return true;
}
if ( isBreak() ) {
clusters.push( codepoint );
} else {
// TODO: This is not covered by tests, is it needed?
// istanbul ignore next
if ( !clusters.length ) {
clusters.push( '' );
}
clusters[ clusters.length - 1 ] += codepoint;
}
return clusters;
}, [] );
};
}() );
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