Script for Romanize Sinhala Text

romanizer.py

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+# This helps converting Sinhala text to standard Romanized text
+
+import re
+
+# -- Specials (vowels, diacritics, standalone signs) --
+
+ro_specials = [
+    ['ඓ', 'ai'],
+    ['ඖ', 'au'],
+    ['ඍ', 'ṛ'],
+    ['ඎ', 'ṝ'],
+    ['ඐ', 'ḹ'],
+    ['අ', 'a'],
+    ['ආ', 'ā'],
+    ['ඇ', 'æ'], ['ඇ', 'Æ'],
+    ['ඈ', 'ǣ'],
+    ['ඉ', 'i'],
+    ['ඊ', 'ī'],
+    ['උ', 'u'],
+    ['ඌ', 'ū'],
+    ['එ', 'e'],
+    ['ඒ', 'ē'],
+    ['ඔ', 'o'],
+    ['ඕ', 'ō'],
+    ['ඞ්', 'ṅ'],
+    ['ං', 'ṁ'], ['ං', 'ṃ'],
+    ['ඃ', 'ḥ'], ['ඃ', 'Ḥ'],
+]
+
+# -- Consonants --
+
+ro_consonants = [
+    ['ඛ', 'kh'],
+    ['ඨ', 'ṭh'],
+    ['ඝ', 'gh'],
+    ['ඡ', 'ch'],
+    ['ඣ', 'jh'],
+    ['ඦ', 'ñj'],
+    ['ඪ', 'ḍh'],
+    ['ඬ', 'ṇḍ'],
+    ['ථ', 'th'],
+    ['ධ', 'dh'],
+    ['ඵ', 'ph'],
+    ['භ', 'bh'],
+    ['ඹ', 'mb'],
+    ['ඳ', 'ṉd'],
+    ['ඟ', 'ṉg'],
+    ['ඥ', 'gn'],
+    ['ක', 'k'],
+    ['ග', 'g'],
+    ['ච', 'c'],
+    ['ජ', 'j'],
+    ['ඤ', 'ñ'],
+    ['ට', 'ṭ'],
+    ['ඩ', 'ḍ'],
+    ['ණ', 'ṇ'],
+    ['ත', 't'],
+    ['ද', 'd'],
+    ['න', 'n'],
+    ['ප', 'p'],
+    ['බ', 'b'],
+    ['ම', 'm'],
+    ['ය', 'y'],
+    ['ර', 'r'],
+    ['ල', 'l'],
+    ['ව', 'v'],
+    ['ශ', 'ś'],
+    ['ෂ', 'ş'], ['ෂ', 'ṣ'],
+    ['ස', 's'],
+    ['හ', 'h'],
+    ['ළ', 'ḷ'],
+    ['ෆ', 'f']
+]
+
+# -- Combinations (consonant + vowel signs) --
+
+ro_combinations = [
+    ['', '', '්'],
+    ['', 'a', ''],
+    ['', 'ā', 'ා'],
+    ['', 'æ', 'ැ'],
+    ['', 'ǣ', 'ෑ'],
+    ['', 'i', 'ි'],
+    ['', 'ī', 'ී'],
+    ['', 'u', 'ු'],
+    ['', 'ū', 'ූ'],
+    ['', 'e', 'ෙ'],
+    ['', 'ē', 'ේ'],
+    ['', 'ai', 'ෛ'],
+    ['', 'o', 'ො'],
+    ['', 'ō', 'ෝ'],
+    ['', 'ṛ', 'ෘ'],
+    ['', 'ṝ', 'ෲ'],
+    ['', 'au', 'ෞ'],
+    ['', 'ḹ', 'ෳ']
+]
+
+# -- Generate consonant+vowel combos --
+
+def create_conso_combi(combinations, consonants):
+    conso_combi = []
+    for combi in combinations:
+        for conso in consonants:
+            base_sinh = conso[0] + combi[2]
+            base_rom = combi[0] + conso[1] + combi[1]
+            conso_combi.append((base_sinh, base_rom))
+    return conso_combi
+
+ro_conso_combi = create_conso_combi(ro_combinations, ro_consonants)
+
+# -- Core replace function --
+def replace_all(text, mapping):
+
+    # sort by length (to handle longest matches first)
+    mapping = sorted(mapping, key=lambda x: len(x[0]), reverse=True)
+    for sinh, rom in mapping:
+        text = re.sub(sinh, rom, text)
+    return text
+
+# -- Main Sinhala → Roman Function --
+def sinhala_to_roman(text):
+
+    # remove ZWJ (zero-width joiner)
+    text = text.replace("\u200D", "")
+
+    # do consonant+vowel combos first
+    text = replace_all(text, ro_conso_combi)
+
+    # then specials
+    text = replace_all(text, ro_specials)
+    return text