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create bidi closure

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notmasteryet 2012-02-22 18:26:43 -06:00
parent e8ca7b44d9
commit 3b29736882
1 changed files with 317 additions and 313 deletions
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src/bidi.js
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@ -3,55 +3,56 @@
'use strict'; 'use strict';
var bidi = (function bidiClosure() {
// Character types for symbols from 0000 to 00FF. // Character types for symbols from 0000 to 00FF.
var baseTypes = [ var baseTypes = [
'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'S', 'B', 'S', 'WS', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'S', 'B', 'S', 'WS',
'B', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'B', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN',
'BN', 'BN', 'B', 'B', 'B', 'S', 'WS', 'ON', 'ON', 'ET', 'ET', 'ET', 'ON', 'BN', 'BN', 'B', 'B', 'B', 'S', 'WS', 'ON', 'ON', 'ET', 'ET', 'ET', 'ON',
'ON', 'ON', 'ON', 'ON', 'ON', 'CS', 'ON', 'CS', 'ON', 'EN', 'EN', 'EN', 'EN', 'ON', 'ON', 'ON', 'ON', 'ON', 'CS', 'ON', 'CS', 'ON', 'EN', 'EN', 'EN',
'EN', 'EN', 'EN', 'EN', 'EN', 'EN', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'EN', 'EN', 'EN', 'EN', 'EN', 'EN', 'EN', 'ON', 'ON', 'ON', 'ON', 'ON',
'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'ON', 'ON', 'ON', 'ON',
'ON', 'ON', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'ON', 'ON', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'ON', 'ON', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'ON', 'ON',
'ON', 'ON', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'B', 'BN', 'BN', 'BN', 'BN', 'ON', 'ON', 'ON', 'ON', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN',
'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'CS', 'ON', 'ET', 'ET',
'ET', 'ET', 'ON', 'ON', 'ON', 'ON', 'L', 'ON', 'ON', 'ON', 'ON', 'ON', 'ET',
'ET', 'EN', 'EN', 'ON', 'L', 'ON', 'ON', 'ON', 'EN', 'L', 'ON', 'ON', 'ON',
'ON', 'ON', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'ON', 'L', 'L', 'L', 'L',
'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'ON', 'L', 'L', 'L', 'ON', 'ON', 'ON', 'ON', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'B', 'BN',
'L', 'L', 'L', 'L', 'L', 'L' 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN',
'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN', 'BN',
'BN', 'CS', 'ON', 'ET', 'ET', 'ET', 'ET', 'ON', 'ON', 'ON', 'ON', 'L', 'ON',
'ON', 'ON', 'ON', 'ON', 'ET', 'ET', 'EN', 'EN', 'ON', 'L', 'ON', 'ON', 'ON',
'EN', 'L', 'ON', 'ON', 'ON', 'ON', 'ON', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
'L', 'ON', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L',
'L', 'L', 'L', 'ON', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'L'
]; ];
// Character types for symbols from 0600 to 06FF // Character types for symbols from 0600 to 06FF
var arabicTypes = [ var arabicTypes = [
'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'CS', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
'AL', 'ON', 'ON', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'AL', 'AL', 'AL', 'CS', 'AL', 'ON', 'ON', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'AL',
'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'NSM', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'AL', 'AL', 'AL', 'AL', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM',
'NSM', 'NSM', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AN', 'AN', 'AN', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'AL', 'AL', 'AL', 'AL',
'AN', 'AN', 'AN', 'AN', 'AN', 'AN', 'AN', 'ET', 'AN', 'AN', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AN', 'AN', 'AN', 'AN', 'AN', 'AN', 'AN', 'AN', 'AN',
'NSM', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AN', 'ET', 'AN', 'AN', 'AL', 'AL', 'AL', 'NSM', 'AL', 'AL', 'AL', 'AL',
'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'NSM', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'ON', 'NSM', 'NSM', 'NSM', 'AL', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM',
'NSM', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'NSM', 'ON', 'NSM',
'AL', 'AL', 'AL', 'AL', 'AL', 'AL' 'NSM', 'NSM', 'NSM', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL',
'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL', 'AL'
]; ];
function bidi(text, startLevel) {
function isOdd(i) { function isOdd(i) {
return (i & 1) != 0; return (i & 1) != 0;
} }
@ -123,6 +124,7 @@ function bidi(text, startLevel) {
} }
} }
return (function bidi(text, startLevel) {
var str = text.str; var str = text.str;
var strLength = str.length; var strLength = str.length;
if (strLength == 0) if (strLength == 0)
@ -193,9 +195,9 @@ function bidi(text, startLevel) {
var eor = sor; var eor = sor;
/* /*
W1. Examine each non-spacing mark (NSM) in the level run, and change the type W1. Examine each non-spacing mark (NSM) in the level run, and change the
of the NSM to the type of the previous character. If the NSM is at the start type of the NSM to the type of the previous character. If the NSM is at the
of the level run, it will get the type of sor. start of the level run, it will get the type of sor.
*/ */
var lastType = sor; var lastType = sor;
@ -207,9 +209,9 @@ function bidi(text, startLevel) {
} }
/* /*
W2. Search backwards from each instance of a European number until the first W2. Search backwards from each instance of a European number until the
strong type (R, L, AL, or sor) is found. If an AL is found, change the type first strong type (R, L, AL, or sor) is found. If an AL is found, change
of the European number to Arabic number. the type of the European number to Arabic number.
*/ */
var lastType = sor; var lastType = sor;
@ -278,9 +280,9 @@ function bidi(text, startLevel) {
} }
/* /*
W7. Search backwards from each instance of a European number until the first W7. Search backwards from each instance of a European number until the
strong type (R, L, or sor) is found. If an L is found, then change the type first strong type (R, L, or sor) is found. If an L is found, then change
of the European number to L. the type of the European number to L.
*/ */
var lastType = sor; var lastType = sor;
@ -293,9 +295,9 @@ function bidi(text, startLevel) {
} }
/* /*
N1. A sequence of neutrals takes the direction of the surrounding strong text N1. A sequence of neutrals takes the direction of the surrounding strong
if the text on both sides has the same direction. European and Arabic numbers text if the text on both sides has the same direction. European and Arabic
are treated as though they were R. Start-of-level-run (sor) and 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. end-of-level-run (eor) are used at level run boundaries.
*/ */
@ -329,9 +331,10 @@ function bidi(text, startLevel) {
/* /*
I1. For all characters with an even (left-to-right) embedding direction, 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. those of type R go up one level and those of type AN or EN go up two
I2. For all characters with an odd (right-to-left) embedding direction, those levels.
of type L, EN or AN go up one level. 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) { for (var i = 0; i < strLength; ++i) {
@ -363,9 +366,9 @@ function bidi(text, startLevel) {
// don't bother as text is only single 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 L2. From the highest level found in the text to the lowest odd level on
line, reverse any contiguous sequence of characters that are at that level or each line, reverse any contiguous sequence of characters that are at that
higher. level or higher.
*/ */
// find highest level & lowest odd level // find highest level & lowest odd level
@ -403,8 +406,8 @@ function bidi(text, startLevel) {
/* /*
L3. Combining marks applied to a right-to-left base character will at this 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 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 follow the base characters in the final display process, then the ordering
the marks and the base character must be reversed. of the marks and the base character must be reversed.
*/ */
// don't bother for now // don't bother for now
@ -426,4 +429,5 @@ function bidi(text, startLevel) {
result += ch; result += ch;
} }
return result; return result;
} });
})();