4 files changed, 56 insertions, 4 deletions

diff --git a/ext/bg/js/japanese.js b/ext/bg/js/japanese.js
index 2a2b39fd..e8b258cb 100644
--- a/ext/bg/js/japanese.js
+++ b/ext/bg/js/japanese.js
@@ -83,6 +83,8 @@
 
     const ITERATION_MARK_CODE_POINT = 0x3005;
 
+    const HIRAGANA_SMALL_TSU_CODE_POINT = 0x3063;
+    const KATAKANA_SMALL_TSU_CODE_POINT = 0x30c3;
 
     // Existing functions
 
@@ -373,6 +375,39 @@
     }
 
 
+    // Miscellaneous
+
+    function collapseEmphaticSequences(sourceText, fullCollapse, sourceMap=null) {
+        let result = '';
+        let collapseCodePoint = -1;
+        const hasSourceMap = (sourceMap !== null);
+        for (const char of sourceText) {
+            const c = char.codePointAt(0);
+            if (c === HIRAGANA_SMALL_TSU_CODE_POINT || c === KATAKANA_SMALL_TSU_CODE_POINT) {
+                if (collapseCodePoint !== c) {
+                    collapseCodePoint = c;
+                    if (!fullCollapse) {
+                        result += char;
+                        continue;
+                    }
+                }
+            } else {
+                collapseCodePoint = -1;
+                result += char;
+                continue;
+            }
+
+            if (hasSourceMap) {
+                const index = result.length;
+                if (index > 0) {
+                    sourceMap.combine(index - 1, 1);
+                }
+            }
+        }
+        return result;
+    }
+
+
     // Exports
 
     Object.assign(jp, {
@@ -384,6 +419,7 @@
         convertHalfWidthKanaToFullWidth,
         convertAlphabeticToKana,
         distributeFurigana,
-        distributeFuriganaInflected
+        distributeFuriganaInflected,
+        collapseEmphaticSequences
     });
 })();
diff --git a/ext/bg/js/options.js b/ext/bg/js/options.js
index abb054d4..fa96c96c 100644
--- a/ext/bg/js/options.js
+++ b/ext/bg/js/options.js
@@ -171,7 +171,8 @@ function profileOptionsCreateDefaults() {
             convertNumericCharacters: 'false',
             convertAlphabeticCharacters: 'false',
             convertHiraganaToKatakana: 'false',
-            convertKatakanaToHiragana: 'variant'
+            convertKatakanaToHiragana: 'variant',
+            collapseEmphaticSequences: 'false'
         },
 
         dictionaries: {},
diff --git a/ext/bg/js/settings/main.js b/ext/bg/js/settings/main.js
index 1653ee35..18c2da73 100644
--- a/ext/bg/js/settings/main.js
+++ b/ext/bg/js/settings/main.js
@@ -119,6 +119,7 @@ async function formRead(options) {
     options.translation.convertAlphabeticCharacters = $('#translation-convert-alphabetic-characters').val();
     options.translation.convertHiraganaToKatakana = $('#translation-convert-hiragana-to-katakana').val();
     options.translation.convertKatakanaToHiragana = $('#translation-convert-katakana-to-hiragana').val();
+    options.translation.collapseEmphaticSequences = $('#translation-collapse-emphatic-sequences').val();
 
     options.parsing.enableScanningParser = $('#parsing-scan-enable').prop('checked');
     options.parsing.enableMecabParser = $('#parsing-mecab-enable').prop('checked');
@@ -200,6 +201,7 @@ async function formWrite(options) {
     $('#translation-convert-alphabetic-characters').val(options.translation.convertAlphabeticCharacters);
     $('#translation-convert-hiragana-to-katakana').val(options.translation.convertHiraganaToKatakana);
     $('#translation-convert-katakana-to-hiragana').val(options.translation.convertKatakanaToHiragana);
+    $('#translation-collapse-emphatic-sequences').val(options.translation.collapseEmphaticSequences);
 
     $('#parsing-scan-enable').prop('checked', options.parsing.enableScanningParser);
     $('#parsing-mecab-enable').prop('checked', options.parsing.enableMecabParser);
diff --git a/ext/bg/js/translator.js b/ext/bg/js/translator.js
index 27f91c05..402ac6bd 100644
--- a/ext/bg/js/translator.js
+++ b/ext/bg/js/translator.js
@@ -348,17 +348,27 @@ class Translator {
 
     getAllDeinflections(text, options) {
         const translationOptions = options.translation;
+        const collapseEmphaticOptions = [[false, false]];
+        switch (translationOptions.collapseEmphaticSequences) {
+            case 'true':
+                collapseEmphaticOptions.push([true, false]);
+                break;
+            case 'full':
+                collapseEmphaticOptions.push([true, true]);
+                break;
+        }
         const textOptionVariantArray = [
             Translator.getTextOptionEntryVariants(translationOptions.convertHalfWidthCharacters),
             Translator.getTextOptionEntryVariants(translationOptions.convertNumericCharacters),
             Translator.getTextOptionEntryVariants(translationOptions.convertAlphabeticCharacters),
             Translator.getTextOptionEntryVariants(translationOptions.convertHiraganaToKatakana),
-            Translator.getTextOptionEntryVariants(translationOptions.convertKatakanaToHiragana)
+            Translator.getTextOptionEntryVariants(translationOptions.convertKatakanaToHiragana),
+            collapseEmphaticOptions
         ];
 
         const deinflections = [];
         const used = new Set();
-        for (const [halfWidth, numeric, alphabetic, katakana, hiragana] of Translator.getArrayVariants(textOptionVariantArray)) {
+        for (const [halfWidth, numeric, alphabetic, katakana, hiragana, [collapseEmphatic, collapseEmphaticFull]] of Translator.getArrayVariants(textOptionVariantArray)) {
             let text2 = text;
             const sourceMap = new TextSourceMap(text2);
             if (halfWidth) {
@@ -376,6 +386,9 @@ class Translator {
             if (hiragana) {
                 text2 = jp.convertKatakanaToHiragana(text2);
             }
+            if (collapseEmphatic) {
+                text2 = jp.collapseEmphaticSequences(text2, collapseEmphaticFull, sourceMap);
+            }
 
             for (let i = text2.length; i > 0; --i) {
                 const text2Substring = text2.substring(0, i);