create bidi closure
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src/bidi.js
630
src/bidi.js
@ -3,55 +3,56 @@
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'use strict';
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// Character types for symbols from 0000 to 00FF.
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var baseTypes = [
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'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'S', 'B', 'S', 'WS',
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'B', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN',
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'BN', 'BN', 'B', 'B', 'B', 'S', 'WS', 'ON', 'ON', 'ET', 'ET', 'ET', 'ON',
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'ON', 'ON', 'ON', 'ON', 'ON', 'CS', 'ON', 'CS', 'ON', 'EN', 'EN', 'EN', 'EN',
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'EN', 'EN', 'EN', 'EN', 'EN', 'EN', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON',
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'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
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'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'ON', 'ON', 'ON', 'ON',
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'ON', 'ON', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
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'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'ON', 'ON',
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'ON', 'ON', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'B', 'BN', 'BN', 'BN', 'BN',
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'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN',
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'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'CS', 'ON', 'ET', 'ET',
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'ET', 'ET', 'ON', 'ON', 'ON', 'ON', 'L', 'ON', 'ON', 'ON', 'ON', 'ON', 'ET',
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'ET', 'EN', 'EN', 'ON', 'L', 'ON', 'ON', 'ON', 'EN', 'L', 'ON', 'ON', 'ON',
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'ON', 'ON', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
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'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'ON', 'L', 'L', 'L', 'L',
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'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
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'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'ON', 'L', 'L',
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'L', 'L', 'L', 'L', 'L', 'L'
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];
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var bidi = (function bidiClosure() {
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// Character types for symbols from 0000 to 00FF.
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var baseTypes = [
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'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'S', 'B', 'S', 'WS',
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'B', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN',
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'BN', 'BN', 'B', 'B', 'B', 'S', 'WS', 'ON', 'ON', 'ET', 'ET', 'ET', 'ON',
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'ON', 'ON', 'ON', 'ON', 'ON', 'CS', 'ON', 'CS', 'ON', 'EN', 'EN', 'EN',
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'EN', 'EN', 'EN', 'EN', 'EN', 'EN', 'EN', 'ON', 'ON', 'ON', 'ON', 'ON',
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'ON', 'ON', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
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'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'ON', 'ON',
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'ON', 'ON', 'ON', 'ON', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
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'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
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'L', 'ON', 'ON', 'ON', 'ON', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'B', 'BN',
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'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN',
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'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN',
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'BN', 'CS', 'ON', 'ET', 'ET', 'ET', 'ET', 'ON', 'ON', 'ON', 'ON', 'L', 'ON',
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'ON', 'ON', 'ON', 'ON', 'ET', 'ET', 'EN', 'EN', 'ON', 'L', 'ON', 'ON', 'ON',
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'EN', 'L', 'ON', 'ON', 'ON', 'ON', 'ON', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
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'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
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'L', 'ON', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
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'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
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'L', 'L', 'L', 'ON', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L'
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];
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// Character types for symbols from 0600 to 06FF
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var arabicTypes = [
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'CS',
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'AL', 'ON', 'ON', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'NSM',
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'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM',
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'NSM', 'NSM', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AN', 'AN', 'AN',
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'AN', 'AN', 'AN', 'AN', 'AN', 'AN', 'AN', 'ET', 'AN', 'AN', 'AL', 'AL', 'AL',
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'NSM', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'NSM',
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'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM',
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'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'ON', 'NSM', 'NSM', 'NSM',
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'NSM', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL'
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];
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// Character types for symbols from 0600 to 06FF
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var arabicTypes = [
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'CS', 'AL', 'ON', 'ON', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM',
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'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AN', 'AN', 'AN', 'AN', 'AN', 'AN', 'AN', 'AN', 'AN',
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'AN', 'ET', 'AN', 'AN', 'AL', 'AL', 'AL', 'NSM', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM',
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'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'ON', 'NSM',
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'NSM', 'NSM', 'NSM', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
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'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL'
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];
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function bidi(text, startLevel) {
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function isOdd(i) {
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return (i & 1) != 0;
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}
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@ -123,307 +124,310 @@ function bidi(text, startLevel) {
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}
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}
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var str = text.str;
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var strLength = str.length;
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if (strLength == 0)
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return str;
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return (function bidi(text, startLevel) {
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var str = text.str;
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var strLength = str.length;
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if (strLength == 0)
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return str;
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// get types, fill arrays
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// get types, fill arrays
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var chars = new Array(strLength);
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var types = new Array(strLength);
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var oldtypes = new Array(strLength);
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var numBidi = 0;
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var chars = new Array(strLength);
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var types = new Array(strLength);
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var oldtypes = new Array(strLength);
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var numBidi = 0;
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for (var i = 0; i < strLength; ++i) {
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chars[i] = str.charAt(i);
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for (var i = 0; i < strLength; ++i) {
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chars[i] = str.charAt(i);
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var charCode = str.charCodeAt(i);
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var charType = 'L';
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if (charCode <= 0x00ff)
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charType = baseTypes[charCode];
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else if (0x0590 <= charCode && charCode <= 0x05f4)
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charType = 'R';
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else if (0x0600 <= charCode && charCode <= 0x06ff)
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charType = arabicTypes[charCode & 0xff];
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else if (0x0700 <= charCode && charCode <= 0x08AC)
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charType = 'AL';
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var charCode = str.charCodeAt(i);
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var charType = 'L';
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if (charCode <= 0x00ff)
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charType = baseTypes[charCode];
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else if (0x0590 <= charCode && charCode <= 0x05f4)
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charType = 'R';
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else if (0x0600 <= charCode && charCode <= 0x06ff)
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charType = arabicTypes[charCode & 0xff];
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else if (0x0700 <= charCode && charCode <= 0x08AC)
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charType = 'AL';
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if (charType == 'R' || charType == 'AL' || charType == 'AN')
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numBidi++;
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if (charType == 'R' || charType == 'AL' || charType == 'AN')
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numBidi++;
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oldtypes[i] = types[i] = charType;
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}
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oldtypes[i] = types[i] = charType;
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}
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// detect the bidi method
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// if there are no rtl characters then no bidi needed
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// if less than 30% chars are rtl then string is primarily ltr
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// if more than 30% chars are rtl then string is primarily rtl
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if (numBidi == 0) {
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text.direction = 'ltr';
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return str;
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}
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if (startLevel == -1) {
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if ((strLength / numBidi) < 0.3) {
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// detect the bidi method
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// if there are no rtl characters then no bidi needed
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// if less than 30% chars are rtl then string is primarily ltr
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// if more than 30% chars are rtl then string is primarily rtl
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if (numBidi == 0) {
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text.direction = 'ltr';
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startLevel = 0;
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} else {
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text.direction = 'rtl';
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startLevel = 1;
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return str;
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}
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}
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var levels = new Array(strLength);
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for (var i = 0; i < strLength; ++i) {
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levels[i] = startLevel;
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}
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var diffChars = new Array(strLength);
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var diffLevels = new Array(strLength);
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var diffTypes = new Array(strLength);
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/*
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X1-X10: skip most of this, since we are NOT doing the embeddings.
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*/
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var e = isOdd(startLevel) ? 'R' : 'L';
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var sor = e;
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var eor = sor;
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/*
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W1. Examine each non-spacing mark (NSM) in the level run, and change the type
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of the NSM to the type of the previous character. If the NSM is at the start
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of the level run, it will get the type of sor.
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*/
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var lastType = sor;
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for (var i = 0; i < strLength; ++i) {
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if (types[i] == 'NSM')
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types[i] = lastType;
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else
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lastType = types[i];
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}
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/*
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W2. Search backwards from each instance of a European number until the first
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strong type (R, L, AL, or sor) is found. If an AL is found, change the type
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of the European number to Arabic number.
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*/
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var lastType = sor;
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for (var i = 0; i < strLength; ++i) {
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var t = types[i];
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if (t == 'EN')
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types[i] = (lastType == 'AL') ? 'AN' : 'EN';
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else if (t == 'R' || t == 'L' || t == 'AL')
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lastType = t;
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}
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/*
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W3. Change all ALs to R.
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*/
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for (var i = 0; i < strLength; ++i) {
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var t = types[i];
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if (t == 'AL')
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types[i] = 'R';
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}
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/*
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W4. A single European separator between two European numbers changes to a
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European number. A single common separator between two numbers of the same
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type changes to that type:
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*/
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for (var i = 1; i < strLength - 1; ++i) {
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if (types[i] == 'ES' && types[i - 1] == 'EN' && types[i + 1] == 'EN')
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types[i] = 'EN';
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if (types[i] == 'CS' && (types[i - 1] == 'EN' || types[i - 1] == 'AN') &&
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types[i + 1] == types[i - 1])
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types[i] = types[i - 1];
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}
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/*
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W5. A sequence of European terminators adjacent to European numbers changes
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to all European numbers:
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*/
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for (var i = 0; i < strLength; ++i) {
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if (types[i] == 'EN') {
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// do before
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for (var j = i - 1; j >= 0; --j) {
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if (types[j] != 'ET')
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break;
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types[j] = 'EN';
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}
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// do after
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for (var j = i + 1; j < strLength; --j) {
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if (types[j] != 'ET')
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break;
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types[j] = 'EN';
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if (startLevel == -1) {
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if ((strLength / numBidi) < 0.3) {
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text.direction = 'ltr';
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startLevel = 0;
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} else {
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text.direction = 'rtl';
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startLevel = 1;
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}
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}
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}
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/*
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W6. Otherwise, separators and terminators change to Other Neutral:
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*/
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var levels = new Array(strLength);
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for (var i = 0; i < strLength; ++i) {
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var t = types[i];
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if (t == 'WS' || t == 'ES' || t == 'ET' || t == 'CS')
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types[i] = 'ON';
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}
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/*
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W7. Search backwards from each instance of a European number until the first
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strong type (R, L, or sor) is found. If an L is found, then change the type
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of the European number to L.
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*/
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var lastType = sor;
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for (var i = 0; i < strLength; ++i) {
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var t = types[i];
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if (t == 'EN')
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types[i] = (lastType == 'L') ? 'L' : 'EN';
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else if (t == 'R' || t == 'L')
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lastType = t;
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}
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/*
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N1. A sequence of neutrals takes the direction of the surrounding strong text
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if the text on both sides has the same direction. European and Arabic numbers
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are treated as though they were R. Start-of-level-run (sor) and
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end-of-level-run (eor) are used at level run boundaries.
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*/
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for (var i = 0; i < strLength; ++i) {
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if (types[i] == 'ON') {
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var end = findUnequal(types, i + 1, 'ON');
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var before = sor;
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if (i > 0)
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before = types[i - 1];
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var after = eor;
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if (end + 1 < strLength)
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after = types[end + 1];
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if (before != 'L')
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before = 'R';
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if (after != 'L')
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after = 'R';
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||||
if (before == after)
|
||||
setValues(types, i, end, before);
|
||||
i = end - 1; // reset to end (-1 so next iteration is ok)
|
||||
for (var i = 0; i < strLength; ++i) {
|
||||
levels[i] = startLevel;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
N2. Any remaining neutrals take the embedding direction.
|
||||
*/
|
||||
var diffChars = new Array(strLength);
|
||||
var diffLevels = new Array(strLength);
|
||||
var diffTypes = new Array(strLength);
|
||||
|
||||
for (var i = 0; i < strLength; ++i) {
|
||||
if (types[i] == 'ON')
|
||||
types[i] = e;
|
||||
}
|
||||
/*
|
||||
X1-X10: skip most of this, since we are NOT doing the embeddings.
|
||||
*/
|
||||
|
||||
/*
|
||||
I1. For all characters with an even (left-to-right) embedding direction,
|
||||
those of type R go up one level and those of type AN or EN go up two levels.
|
||||
I2. For all characters with an odd (right-to-left) embedding direction, those
|
||||
of type L, EN or AN go up one level.
|
||||
*/
|
||||
var e = isOdd(startLevel) ? 'R' : 'L';
|
||||
var sor = e;
|
||||
var eor = sor;
|
||||
|
||||
for (var i = 0; i < strLength; ++i) {
|
||||
var t = types[i];
|
||||
if (isEven(levels[i])) {
|
||||
if (t == 'R') {
|
||||
levels[i] += 1;
|
||||
} else if (t == 'AN' || t == 'EN') {
|
||||
levels[i] += 2;
|
||||
}
|
||||
} else { // isOdd, so
|
||||
if (t == 'L' || t == 'AN' || t == 'EN') {
|
||||
levels[i] += 1;
|
||||
}
|
||||
/*
|
||||
W1. Examine each non-spacing mark (NSM) in the level run, and change the
|
||||
type of the NSM to the type of the previous character. If the NSM is at the
|
||||
start of the level run, it will get the type of sor.
|
||||
*/
|
||||
|
||||
var lastType = sor;
|
||||
for (var i = 0; i < strLength; ++i) {
|
||||
if (types[i] == 'NSM')
|
||||
types[i] = lastType;
|
||||
else
|
||||
lastType = types[i];
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
L1. On each line, reset the embedding level of the following characters to
|
||||
the paragraph embedding level:
|
||||
/*
|
||||
W2. Search backwards from each instance of a European number until the
|
||||
first strong type (R, L, AL, or sor) is found. If an AL is found, change
|
||||
the type of the European number to Arabic number.
|
||||
*/
|
||||
|
||||
segment separators,
|
||||
paragraph separators,
|
||||
any sequence of whitespace characters preceding a segment separator or
|
||||
paragraph separator, and any sequence of white space characters at the end
|
||||
of the line.
|
||||
*/
|
||||
var lastType = sor;
|
||||
for (var i = 0; i < strLength; ++i) {
|
||||
var t = types[i];
|
||||
if (t == 'EN')
|
||||
types[i] = (lastType == 'AL') ? 'AN' : 'EN';
|
||||
else if (t == 'R' || t == 'L' || t == 'AL')
|
||||
lastType = t;
|
||||
}
|
||||
|
||||
// don't bother as text is only single line
|
||||
/*
|
||||
W3. Change all ALs to R.
|
||||
*/
|
||||
|
||||
/*
|
||||
L2. From the highest level found in the text to the lowest odd level on each
|
||||
line, reverse any contiguous sequence of characters that are at that level or
|
||||
higher.
|
||||
*/
|
||||
for (var i = 0; i < strLength; ++i) {
|
||||
var t = types[i];
|
||||
if (t == 'AL')
|
||||
types[i] = 'R';
|
||||
}
|
||||
|
||||
// find highest level & lowest odd level
|
||||
/*
|
||||
W4. A single European separator between two European numbers changes to a
|
||||
European number. A single common separator between two numbers of the same
|
||||
type changes to that type:
|
||||
*/
|
||||
|
||||
var highestLevel = -1;
|
||||
var lowestOddLevel = 99;
|
||||
for (var i = 0, ii = levels.length; i < ii; ++i) {
|
||||
var level = levels[i];
|
||||
if (highestLevel < level)
|
||||
highestLevel = level;
|
||||
if (lowestOddLevel > level && isOdd(level))
|
||||
lowestOddLevel = level;
|
||||
}
|
||||
for (var i = 1; i < strLength - 1; ++i) {
|
||||
if (types[i] == 'ES' && types[i - 1] == 'EN' && types[i + 1] == 'EN')
|
||||
types[i] = 'EN';
|
||||
if (types[i] == 'CS' && (types[i - 1] == 'EN' || types[i - 1] == 'AN') &&
|
||||
types[i + 1] == types[i - 1])
|
||||
types[i] = types[i - 1];
|
||||
}
|
||||
|
||||
// now reverse between those limits
|
||||
/*
|
||||
W5. A sequence of European terminators adjacent to European numbers changes
|
||||
to all European numbers:
|
||||
*/
|
||||
|
||||
for (var level = highestLevel; level >= lowestOddLevel; --level) {
|
||||
// find segments to reverse
|
||||
var start = -1;
|
||||
for (var i = 0, ii = levels.length; i < ii; ++i) {
|
||||
if (levels[i] < level) {
|
||||
if (start >= 0) {
|
||||
reverseValues(chars, start, i);
|
||||
start = -1;
|
||||
for (var i = 0; i < strLength; ++i) {
|
||||
if (types[i] == 'EN') {
|
||||
// do before
|
||||
for (var j = i - 1; j >= 0; --j) {
|
||||
if (types[j] != 'ET')
|
||||
break;
|
||||
types[j] = 'EN';
|
||||
}
|
||||
// do after
|
||||
for (var j = i + 1; j < strLength; --j) {
|
||||
if (types[j] != 'ET')
|
||||
break;
|
||||
types[j] = 'EN';
|
||||
}
|
||||
} else if (start < 0) {
|
||||
start = i;
|
||||
}
|
||||
}
|
||||
if (start >= 0) {
|
||||
reverseValues(chars, start, levels.length);
|
||||
|
||||
/*
|
||||
W6. Otherwise, separators and terminators change to Other Neutral:
|
||||
*/
|
||||
|
||||
for (var i = 0; i < strLength; ++i) {
|
||||
var t = types[i];
|
||||
if (t == 'WS' || t == 'ES' || t == 'ET' || t == 'CS')
|
||||
types[i] = 'ON';
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
L3. Combining marks applied to a right-to-left base character will at this
|
||||
point precede their base character. If the rendering engine expects them to
|
||||
follow the base characters in the final display process, then the ordering of
|
||||
the marks and the base character must be reversed.
|
||||
*/
|
||||
/*
|
||||
W7. Search backwards from each instance of a European number until the
|
||||
first strong type (R, L, or sor) is found. If an L is found, then change
|
||||
the type of the European number to L.
|
||||
*/
|
||||
|
||||
// don't bother for now
|
||||
var lastType = sor;
|
||||
for (var i = 0; i < strLength; ++i) {
|
||||
var t = types[i];
|
||||
if (t == 'EN')
|
||||
types[i] = (lastType == 'L') ? 'L' : 'EN';
|
||||
else if (t == 'R' || t == 'L')
|
||||
lastType = t;
|
||||
}
|
||||
|
||||
/*
|
||||
L4. A character that possesses the mirrored property as specified by
|
||||
Section 4.7, Mirrored, must be depicted by a mirrored glyph if the resolved
|
||||
directionality of that character is R.
|
||||
*/
|
||||
/*
|
||||
N1. A sequence of neutrals takes the direction of the surrounding strong
|
||||
text if the text on both sides has the same direction. European and Arabic
|
||||
numbers are treated as though they were R. Start-of-level-run (sor) and
|
||||
end-of-level-run (eor) are used at level run boundaries.
|
||||
*/
|
||||
|
||||
// don't mirror as characters are already mirrored in the pdf
|
||||
for (var i = 0; i < strLength; ++i) {
|
||||
if (types[i] == 'ON') {
|
||||
var end = findUnequal(types, i + 1, 'ON');
|
||||
var before = sor;
|
||||
if (i > 0)
|
||||
before = types[i - 1];
|
||||
var after = eor;
|
||||
if (end + 1 < strLength)
|
||||
after = types[end + 1];
|
||||
if (before != 'L')
|
||||
before = 'R';
|
||||
if (after != 'L')
|
||||
after = 'R';
|
||||
if (before == after)
|
||||
setValues(types, i, end, before);
|
||||
i = end - 1; // reset to end (-1 so next iteration is ok)
|
||||
}
|
||||
}
|
||||
|
||||
// Finally, return string
|
||||
/*
|
||||
N2. Any remaining neutrals take the embedding direction.
|
||||
*/
|
||||
|
||||
var result = '';
|
||||
for (var i = 0, ii = chars.length; i < ii; ++i) {
|
||||
var ch = chars[i];
|
||||
if (ch != '<' && ch != '>')
|
||||
result += ch;
|
||||
}
|
||||
return result;
|
||||
}
|
||||
for (var i = 0; i < strLength; ++i) {
|
||||
if (types[i] == 'ON')
|
||||
types[i] = e;
|
||||
}
|
||||
|
||||
/*
|
||||
I1. For all characters with an even (left-to-right) embedding direction,
|
||||
those of type R go up one level and those of type AN or EN go up two
|
||||
levels.
|
||||
I2. For all characters with an odd (right-to-left) embedding direction,
|
||||
those of type L, EN or AN go up one level.
|
||||
*/
|
||||
|
||||
for (var i = 0; i < strLength; ++i) {
|
||||
var t = types[i];
|
||||
if (isEven(levels[i])) {
|
||||
if (t == 'R') {
|
||||
levels[i] += 1;
|
||||
} else if (t == 'AN' || t == 'EN') {
|
||||
levels[i] += 2;
|
||||
}
|
||||
} else { // isOdd, so
|
||||
if (t == 'L' || t == 'AN' || t == 'EN') {
|
||||
levels[i] += 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
L1. On each line, reset the embedding level of the following characters to
|
||||
the paragraph embedding level:
|
||||
|
||||
segment separators,
|
||||
paragraph separators,
|
||||
any sequence of whitespace characters preceding a segment separator or
|
||||
paragraph separator, and any sequence of white space characters at the end
|
||||
of the line.
|
||||
*/
|
||||
|
||||
// don't bother as text is only single line
|
||||
|
||||
/*
|
||||
L2. From the highest level found in the text to the lowest odd level on
|
||||
each line, reverse any contiguous sequence of characters that are at that
|
||||
level or higher.
|
||||
*/
|
||||
|
||||
// find highest level & lowest odd level
|
||||
|
||||
var highestLevel = -1;
|
||||
var lowestOddLevel = 99;
|
||||
for (var i = 0, ii = levels.length; i < ii; ++i) {
|
||||
var level = levels[i];
|
||||
if (highestLevel < level)
|
||||
highestLevel = level;
|
||||
if (lowestOddLevel > level && isOdd(level))
|
||||
lowestOddLevel = level;
|
||||
}
|
||||
|
||||
// now reverse between those limits
|
||||
|
||||
for (var level = highestLevel; level >= lowestOddLevel; --level) {
|
||||
// find segments to reverse
|
||||
var start = -1;
|
||||
for (var i = 0, ii = levels.length; i < ii; ++i) {
|
||||
if (levels[i] < level) {
|
||||
if (start >= 0) {
|
||||
reverseValues(chars, start, i);
|
||||
start = -1;
|
||||
}
|
||||
} else if (start < 0) {
|
||||
start = i;
|
||||
}
|
||||
}
|
||||
if (start >= 0) {
|
||||
reverseValues(chars, start, levels.length);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
L3. Combining marks applied to a right-to-left base character will at this
|
||||
point precede their base character. If the rendering engine expects them to
|
||||
follow the base characters in the final display process, then the ordering
|
||||
of the marks and the base character must be reversed.
|
||||
*/
|
||||
|
||||
// don't bother for now
|
||||
|
||||
/*
|
||||
L4. A character that possesses the mirrored property as specified by
|
||||
Section 4.7, Mirrored, must be depicted by a mirrored glyph if the resolved
|
||||
directionality of that character is R.
|
||||
*/
|
||||
|
||||
// don't mirror as characters are already mirrored in the pdf
|
||||
|
||||
// Finally, return string
|
||||
|
||||
var result = '';
|
||||
for (var i = 0, ii = chars.length; i < ii; ++i) {
|
||||
var ch = chars[i];
|
||||
if (ch != '<' && ch != '>')
|
||||
result += ch;
|
||||
}
|
||||
return result;
|
||||
});
|
||||
})();
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user