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authortoasted-nutbread <toasted-nutbread@users.noreply.github.com>2020-12-22 11:02:19 -0500
committerGitHub <noreply@github.com>2020-12-22 11:02:19 -0500
commita354becd5110217f36e4b9fdb883aa0e7bc520bc (patch)
tree5611a591320b955919ec37ba933afcb0fd99a4f9 /ext/mixed/js/japanese.js
parentb083e9f08f5236c3a23534554cafa91eb558e061 (diff)
Furigana distribution improvements (#1157)
* Improve furigana when reading kana is not an exact match * Simplify group structure * Return consistent type * Add more tests * Remove redundant isAmbiguous assignment * Simplify group usage * Add helper function * Optimize returned arrays * Use variable * Remove s(p)lice calls * Reduce number of convertKatakanaToHiragana calls * Optimize text length access * Optimize reading substring * Move segmentize to a separate function * Use var * Use _createFuriganaSegment * Optimize distributeFuriganaInflected
Diffstat (limited to 'ext/mixed/js/japanese.js')
-rw-r--r--ext/mixed/js/japanese.js132
1 files changed, 77 insertions, 55 deletions
diff --git a/ext/mixed/js/japanese.js b/ext/mixed/js/japanese.js
index 4bd0dc65..a6b5c150 100644
--- a/ext/mixed/js/japanese.js
+++ b/ext/mixed/js/japanese.js
@@ -406,72 +406,40 @@ const JapaneseUtil = (() => {
distributeFurigana(expression, reading) {
if (!reading || reading === expression) {
// Same
- return [{furigana: '', text: expression}];
+ return [this._createFuriganaSegment(expression, '')];
}
- let isAmbiguous = false;
- const segmentize = (reading2, groups) => {
- if (groups.length === 0 || isAmbiguous) {
- return [];
- }
-
- const group = groups[0];
- if (group.mode === 'kana') {
- if (this.convertKatakanaToHiragana(reading2).startsWith(this.convertKatakanaToHiragana(group.text))) {
- const readingLeft = reading2.substring(group.text.length);
- const segs = segmentize(readingLeft, groups.splice(1));
- if (segs) {
- return [{text: group.text, furigana: ''}].concat(segs);
- }
- }
- } else {
- let foundSegments = null;
- for (let i = reading2.length; i >= group.text.length; --i) {
- const readingUsed = reading2.substring(0, i);
- const readingLeft = reading2.substring(i);
- const segs = segmentize(readingLeft, groups.slice(1));
- if (segs) {
- if (foundSegments !== null) {
- // more than one way to segmentize the tail, mark as ambiguous
- isAmbiguous = true;
- return null;
- }
- foundSegments = [{text: group.text, furigana: readingUsed}].concat(segs);
- }
- // there is only one way to segmentize the last non-kana group
- if (groups.length === 1) {
- break;
- }
- }
- return foundSegments;
- }
- };
-
const groups = [];
- let modePrev = null;
+ let groupPre = null;
+ let isKanaPre = null;
for (const c of expression) {
const codePoint = c.codePointAt(0);
- const modeCurr = this.isCodePointKanji(codePoint) || codePoint === ITERATION_MARK_CODE_POINT ? 'kanji' : 'kana';
- if (modeCurr === modePrev) {
- groups[groups.length - 1].text += c;
+ const isKana = !(this.isCodePointKanji(codePoint) || codePoint === ITERATION_MARK_CODE_POINT);
+ if (isKana === isKanaPre) {
+ groupPre.text += c;
} else {
- groups.push({mode: modeCurr, text: c});
- modePrev = modeCurr;
+ groupPre = {isKana, text: c, textNormalized: null};
+ groups.push(groupPre);
+ isKanaPre = isKana;
+ }
+ }
+ for (const group of groups) {
+ if (group.isKana) {
+ group.textNormalized = this.convertKatakanaToHiragana(group.text);
}
}
- const segments = segmentize(reading, groups);
- if (segments && !isAmbiguous) {
+ const readingNormalized = this.convertKatakanaToHiragana(reading);
+ const segments = this._segmentizeFurigana(reading, readingNormalized, groups, 0);
+ if (segments !== null) {
return segments;
}
// Fallback
- return [{furigana: reading, text: expression}];
+ return [this._createFuriganaSegment(expression, reading)];
}
distributeFuriganaInflected(expression, reading, source) {
- const output = [];
-
let stemLength = 0;
const shortest = Math.min(source.length, expression.length);
const sourceHiragana = this.convertKatakanaToHiragana(source);
@@ -486,15 +454,13 @@ const JapaneseUtil = (() => {
0,
offset === 0 ? reading.length : reading.length - expression.length + stemLength
);
- for (const segment of this.distributeFurigana(stemExpression, stemReading)) {
- output.push(segment);
- }
+ const result = this.distributeFurigana(stemExpression, stemReading);
if (stemLength !== source.length) {
- output.push({text: source.substring(stemLength), furigana: ''});
+ result.push(this._createFuriganaSegment(source.substring(stemLength), ''));
}
- return output;
+ return result;
}
// Miscellaneous
@@ -532,6 +498,62 @@ const JapaneseUtil = (() => {
// Private
+ _createFuriganaSegment(text, furigana) {
+ return {text, furigana};
+ }
+
+ _segmentizeFurigana(reading, readingNormalized, groups, groupsStart) {
+ const groupCount = groups.length - groupsStart;
+ if (groupCount <= 0) {
+ return [];
+ }
+
+ const group = groups[groupsStart];
+ const {isKana, text} = group;
+ const textLength = text.length;
+ if (isKana) {
+ const {textNormalized} = group;
+ if (readingNormalized.startsWith(textNormalized)) {
+ const segments = this._segmentizeFurigana(
+ reading.substring(textLength),
+ readingNormalized.substring(textLength),
+ groups,
+ groupsStart + 1
+ );
+ if (segments !== null) {
+ const furigana = reading.startsWith(text) ? '' : reading.substring(0, textLength);
+ segments.unshift(this._createFuriganaSegment(text, furigana));
+ return segments;
+ }
+ }
+ return null;
+ } else {
+ let result = null;
+ for (let i = reading.length; i >= textLength; --i) {
+ const segments = this._segmentizeFurigana(
+ reading.substring(i),
+ readingNormalized.substring(i),
+ groups,
+ groupsStart + 1
+ );
+ if (segments !== null) {
+ if (result !== null) {
+ // More than one way to segmentize the tail; mark as ambiguous
+ return null;
+ }
+ const furigana = reading.substring(0, i);
+ segments.unshift(this._createFuriganaSegment(text, furigana));
+ result = segments;
+ }
+ // There is only one way to segmentize the last non-kana group
+ if (groupCount === 1) {
+ break;
+ }
+ }
+ return result;
+ }
+ }
+
_getWanakana() {
const wanakana = this._wanakana;
if (wanakana === null) { throw new Error('Functions which use WanaKana are not supported in this context'); }