Get categorization of pitch accents (#1462)

ext/js/display/display-generator.js

@@ -229,7 +229,7 @@ class DisplayGenerator {
     // Private
 
     _createTermExpression(details) {
-        const {termFrequency, furiganaSegments, expression, reading, termTags} = details;
+        const {termFrequency, furiganaSegments, expression, reading, termTags, pitches} = details;
 
         const searchQueries = [];
         if (expression) { searchQueries.push(expression); }
@@ -243,6 +243,11 @@ class DisplayGenerator {
         node.dataset.readingIsSame = `${!reading || reading === expression}`;
         node.dataset.frequency = termFrequency;
 
+        const pitchAccentCategories = this._getPitchAccentCategories(pitches);
+        if (pitchAccentCategories !== null) {
+            node.dataset.pitchAccentCategories = pitchAccentCategories;
+        }
+
         this._setTextContent(node.querySelector('.expression-reading'), reading.length > 0 ? reading : expression);
 
         this._appendFurigana(expressionContainer, furiganaSegments, this._appendKanjiLinks.bind(this));
@@ -716,4 +721,18 @@ class DisplayGenerator {
             node.lang = 'ja';
         }
     }
+
+    _getPitchAccentCategories(pitches) {
+        if (pitches.length === 0) { return null; }
+        const categories = [];
+        for (const {reading, pitches: pitches2} of pitches) {
+            for (const {position} of pitches2) {
+                const category = this._japaneseUtil.getPitchCategory(reading, position, false);
+                if (category !== null) {
+                    categories.push(category);
+                }
+            }
+        }
+        return categories.length > 0 ? categories.join(' ') : null;
+    }
 }

ext/js/language/japanese-util.js

@@ -232,6 +232,22 @@ const JapaneseUtil = (() => {
             }
         }
 
+        getPitchCategory(text, pitchAccentPosition, isVerbOrAdjective) {
+            if (pitchAccentPosition === 0) {
+                return 'heiban';
+            }
+            if (isVerbOrAdjective) {
+                return pitchAccentPosition > 0 ? 'kifuku' : null;
+            }
+            if (pitchAccentPosition === 1) {
+                return 'atamadaka';
+            }
+            if (pitchAccentPosition > 1) {
+                return pitchAccentPosition >= this.getKanaMoraCount(text) ? 'odaka' : 'nakadaka';
+            }
+            return null;
+        }
+
         getKanaMorae(text) {
             const morae = [];
             let i;
@@ -245,6 +261,16 @@ const JapaneseUtil = (() => {
             return morae;
         }
 
+        getKanaMoraCount(text) {
+            let moraCount = 0;
+            for (const c of text) {
+                if (!(SMALL_KANA_SET.has(c) && moraCount > 0)) {
+                    ++moraCount;
+                }
+            }
+            return moraCount;
+        }
+
         // Conversion functions
 
         convertToKana(text) {