mirror of
https://github.com/curioustorvald/Terrarum-sans-bitmap.git
synced 2026-03-07 11:51:50 +09:00
anusvara positioning fixed for DirectWrite and CoreText but now broken for HarfBuzz
This commit is contained in:
minjaesong
Binary file not shown.
@@ -58,6 +58,7 @@ languagesystem hang KOH ;
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languagesystem cyrl SRB ;
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languagesystem cyrl BGR ;
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languagesystem dev2 dflt;
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languagesystem deva dflt;
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languagesystem tml2 dflt;
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languagesystem sund dflt;
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"""
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@@ -182,7 +183,7 @@ def _generate_hangul_gsub(glyphs, has, jamo_data):
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pua_fn = jamo_data['pua_fn']
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# Build codepoint lists (standard + extended jamo ranges)
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cho_ranges = list(range(0x1100, 0x115F)) + list(range(0xA960, 0xA97C))
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cho_ranges = list(range(0x1100, 0x115F)) + list(range(0xA960, 0xA97D))
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jung_ranges = list(range(0x1160, 0x11A8)) + list(range(0xD7B0, 0xD7C7))
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jong_ranges = list(range(0x11A8, 0x1200)) + list(range(0xD7CB, 0xD7FC))
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@@ -720,11 +721,14 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
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ccmp_parts.extend(vowel_decomp_subs)
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ccmp_parts.append("} DevaVowelDecomp;")
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ccmp_parts.append("")
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# locl for dev2 — DirectWrite applies locl as the first feature
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# for Devanagari shaping. Registering consonant mapping and vowel
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# decomposition here ensures they fire on DirectWrite.
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# locl for dev2/deva — DirectWrite applies locl as the first
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# feature for Devanagari shaping. Registering consonant mapping
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# and vowel decomposition here ensures they fire on DirectWrite.
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# Both dev2 (new Indic) and deva (old Indic) script tags are
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# needed for CoreText compatibility.
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ccmp_parts.append("feature locl {")
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ccmp_parts.append(" script dev2;")
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for _st in ['dev2', 'deva']:
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ccmp_parts.append(f" script {_st};")
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if ccmp_subs:
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ccmp_parts.append(" lookup DevaConsonantMap;")
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if anusvara_ccmp_subs:
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@@ -733,9 +737,10 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
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ccmp_parts.append(" lookup DevaVowelDecomp;")
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ccmp_parts.append("} locl;")
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ccmp_parts.append("")
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# ccmp for dev2 — HarfBuzz applies ccmp before reordering
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# ccmp for dev2/deva — HarfBuzz applies ccmp before reordering
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ccmp_parts.append("feature ccmp {")
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ccmp_parts.append(" script dev2;")
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for _st in ['dev2', 'deva']:
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ccmp_parts.append(f" script {_st};")
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if ccmp_subs:
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ccmp_parts.append(" lookup DevaConsonantMap;")
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if anusvara_ccmp_subs:
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@@ -756,7 +761,9 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
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f" sub {glyph_name(internal)} {glyph_name(0x093C)} by {glyph_name(nukta_form)};"
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)
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if nukt_subs:
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features.append("feature nukt {\n script dev2;\n" + '\n'.join(nukt_subs) + "\n} nukt;")
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nukt_body = '\n'.join(nukt_subs)
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features.append("feature nukt {\n script dev2;\n" + nukt_body
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+ "\n script deva;\n" + nukt_body + "\n} nukt;")
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# --- akhn: akhand ligatures + conjuncts ---
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# All conjunct ligatures (C1 + virama + C2 → ligature) go in akhn
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@@ -882,7 +889,9 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
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f" sub {glyph_name(c1)} {glyph_name(SC.DEVANAGARI_VIRAMA)} {glyph_name(c2)} by {glyph_name(result)}; # {name}"
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)
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if akhn_subs:
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features.append("feature akhn {\n script dev2;\n" + '\n'.join(akhn_subs) + "\n} akhn;")
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akhn_body = '\n'.join(akhn_subs)
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features.append("feature akhn {\n script dev2;\n" + akhn_body
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+ "\n script deva;\n" + akhn_body + "\n} akhn;")
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# --- half: consonant (PUA) + virama -> half form ---
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# After ccmp, consonants are in PUA form, so reference PUA here.
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@@ -915,7 +924,9 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
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f" sub {glyph_name(SC.MARWARI_LIG_DD_Y)} {glyph_name(SC.DEVANAGARI_VIRAMA)} by {glyph_name(SC.MARWARI_HALFLIG_DD_Y)};"
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)
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if half_subs:
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features.append("feature half {\n script dev2;\n" + '\n'.join(half_subs) + "\n} half;")
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half_body = '\n'.join(half_subs)
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features.append("feature half {\n script dev2;\n" + half_body
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+ "\n script deva;\n" + half_body + "\n} half;")
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# --- blwf: virama + RA -> below-base RA (rakaar) ---
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# This serves two purposes:
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@@ -938,7 +949,9 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
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f" sub {glyph_name(SC.DEVANAGARI_VIRAMA)} {glyph_name(ra_int)} by {glyph_name(ra_sub)};"
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)
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if blwf_subs:
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features.append("feature blwf {\n script dev2;\n" + '\n'.join(blwf_subs) + "\n} blwf;")
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blwf_body = '\n'.join(blwf_subs)
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features.append("feature blwf {\n script dev2;\n" + blwf_body
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+ "\n script deva;\n" + blwf_body + "\n} blwf;")
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# --- cjct: consonant (PUA) + below-base RA -> RA-appended form ---
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# After blwf converts virama+RA to rakaar mark, cjct combines it
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@@ -948,7 +961,10 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
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#
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# A second lookup converts RA-appended + virama -> RA-appended half,
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# since the half feature has already run before cjct.
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cjct_lines = []
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# Lookups defined OUTSIDE the feature block so they can be referenced
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# from both dev2 and deva script sections without name collisions.
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cjct_lookups = []
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cjct_lookup_refs = []
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# Lookup 1: consonant + rakaar -> RA-appended form
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ra_append_subs = []
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@@ -964,9 +980,10 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
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f" sub {glyph_name(SC.MARWARI_DD)} {glyph_name(ra_sub)} by {glyph_name(SC.MARWARI_LIG_DD_R)};"
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)
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if ra_append_subs:
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cjct_lines.append(" lookup CjctRaAppend {")
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cjct_lines.extend(ra_append_subs)
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cjct_lines.append(" } CjctRaAppend;")
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cjct_lookups.append("lookup CjctRaAppend {")
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cjct_lookups.extend(ra_append_subs)
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cjct_lookups.append("} CjctRaAppend;")
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cjct_lookup_refs.append(" lookup CjctRaAppend;")
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# Lookup 2: RA-appended + virama -> RA-appended half form
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ra_half_subs = []
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@@ -977,12 +994,18 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
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f" sub {glyph_name(ra_form)} {glyph_name(SC.DEVANAGARI_VIRAMA)} by {glyph_name(ra_half)};"
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)
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if ra_half_subs:
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cjct_lines.append(" lookup CjctRaHalf {")
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cjct_lines.extend(ra_half_subs)
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cjct_lines.append(" } CjctRaHalf;")
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cjct_lookups.append("lookup CjctRaHalf {")
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cjct_lookups.extend(ra_half_subs)
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cjct_lookups.append("} CjctRaHalf;")
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cjct_lookup_refs.append(" lookup CjctRaHalf;")
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if cjct_lines:
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features.append("feature cjct {\n script dev2;\n" + '\n'.join(cjct_lines) + "\n} cjct;")
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if cjct_lookup_refs:
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cjct_feat = cjct_lookups + ["", "feature cjct {"]
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for _st in ['dev2', 'deva']:
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cjct_feat.append(f" script {_st};")
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cjct_feat.extend(cjct_lookup_refs)
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cjct_feat.append("} cjct;")
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features.append('\n'.join(cjct_feat))
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# --- blws: RA/RRA/HA (PUA) + U/UU -> special syllables ---
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blws_subs = []
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@@ -1000,7 +1023,9 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
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f" sub {glyph_name(c1)} {glyph_name(c2)} by {glyph_name(result)}; # {name}"
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)
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if blws_subs:
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features.append("feature blws {\n script dev2;\n" + '\n'.join(blws_subs) + "\n} blws;")
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blws_body = '\n'.join(blws_subs)
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features.append("feature blws {\n script dev2;\n" + blws_body
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+ "\n script deva;\n" + blws_body + "\n} blws;")
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# --- rphf: RA + virama -> reph ---
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# Must include BOTH Unicode and PUA rules:
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@@ -1009,16 +1034,20 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
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# to its PUA form
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# - PUA rule: matches the actual glyph after ccmp/locl has run
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if has(ra_int) and has(SC.DEVANAGARI_VIRAMA) and has(SC.DEVANAGARI_RA_SUPER):
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rphf_lines = ["feature rphf {", " script dev2;"]
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rphf_rules = []
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if has(0x0930):
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rphf_lines.append(
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rphf_rules.append(
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f" sub {glyph_name(0x0930)} {glyph_name(SC.DEVANAGARI_VIRAMA)}"
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f" by {glyph_name(SC.DEVANAGARI_RA_SUPER)};"
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)
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rphf_lines.append(
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rphf_rules.append(
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f" sub {glyph_name(ra_int)} {glyph_name(SC.DEVANAGARI_VIRAMA)}"
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f" by {glyph_name(SC.DEVANAGARI_RA_SUPER)};"
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)
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rphf_lines = ["feature rphf {"]
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for _st in ['dev2', 'deva']:
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rphf_lines.append(f" script {_st};")
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rphf_lines.extend(rphf_rules)
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rphf_lines.append("} rphf;")
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features.append('\n'.join(rphf_lines))
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@@ -1035,7 +1064,8 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
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pres_lines.append(f"}} AltHalfSha;")
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pres_lines.append("")
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pres_lines.append("feature pres {")
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pres_lines.append(" script dev2;")
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for _st in ['dev2', 'deva']:
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pres_lines.append(f" script {_st};")
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pres_lines.append(f" sub {glyph_name(half_sha)}' lookup AltHalfSha {glyph_name(la_int)};")
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pres_lines.append("} pres;")
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features.append('\n'.join(pres_lines))
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@@ -1116,7 +1146,8 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
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if abvs_lookups:
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abvs_lines.append("")
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abvs_lines.append("feature abvs {")
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abvs_lines.append(" script dev2;")
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for _st in ['dev2', 'deva']:
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abvs_lines.append(f" script {_st};")
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if deva_any_glyphs:
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abvs_lines.append(f" @devaAny = [{' '.join(deva_any_glyphs)}];")
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abvs_lines.extend(abvs_body)
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@@ -1137,7 +1168,9 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
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all_lookups = matra_lookups + ya_lookups + anus_lookups
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all_body = matra_body + ya_body + anus_body
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if all_body:
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feat = ["feature psts {", " script dev2;"]
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feat = ["feature psts {"]
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for _st in ['dev2', 'deva']:
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feat.append(f" script {_st};")
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feat.extend(all_body)
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feat.append("} psts;")
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features.append('\n'.join(all_lookups + [''] + feat))
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@@ -1168,7 +1201,8 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
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calt_lines.append(f"}} InterwordVisarga;")
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calt_lines.append("")
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calt_lines.append("feature calt {")
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calt_lines.append(" script dev2;")
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for _st in ['dev2', 'deva']:
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calt_lines.append(f" script {_st};")
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calt_lines.append(f" @devaFollowing = [{' '.join(deva_following)}];")
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calt_lines.append(f" sub {glyph_name(visarga)}' lookup InterwordVisarga @devaFollowing;")
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calt_lines.append("} calt;")
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@@ -1571,9 +1605,12 @@ def _generate_mark(glyphs, has):
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# and would bloat the GPOS table).
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_EXCLUDE_RANGES = (
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range(0x3400, 0xA000), # CJK Unified Ideographs (Ext A + main)
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range(0xAC00, 0xD7FF), # Hangul Syllables
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range(0xAC00, 0xD800), # Hangul Syllables
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range(0x2800, 0x2900), # Braille
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)
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# I-matra glyphs excluded from MarkToBase (they should not attract
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# mark attachment — marks attach to the consonant, not the matra).
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_EXCLUDE_CPS = {0x093F} | set(range(0xF0110, 0xF0120))
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all_bases = {}
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marks = {}
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@@ -1583,7 +1620,7 @@ def _generate_mark(glyphs, has):
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if g.props.write_on_top >= 0:
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marks[cp] = g
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elif g.bitmap and g.props.width > 0:
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if not any(cp in r for r in _EXCLUDE_RANGES):
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if cp not in _EXCLUDE_CPS and not any(cp in r for r in _EXCLUDE_RANGES):
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all_bases[cp] = g
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if not all_bases or not marks:
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@@ -1758,26 +1795,35 @@ def _generate_mark(glyphs, has):
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lines.append("")
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mkmk_lookup_names.append(mkmk_name)
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# Register MarkToBase lookups under DFLT (for Latin, etc.)
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# Register MarkToBase lookups under mark for non-Devanagari scripts.
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# For dev2/deva, abvm already includes these lookups. Registering
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# mark/mkmk under dev2/deva too risks double-application on shapers
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# (CoreText, DirectWrite) that may process mark AND abvm separately.
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_NON_DEVA_SCRIPTS = ['DFLT', 'latn', 'cyrl', 'grek', 'hang', 'tml2', 'sund']
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lines.append("feature mark {")
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for _st in _NON_DEVA_SCRIPTS:
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lines.append(f" script {_st};")
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for ln in lookup_names:
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lines.append(f" lookup {ln};")
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lines.append("} mark;")
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# Register MarkToMark lookups under mkmk
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# Register MarkToMark lookups under mkmk (non-Devanagari only)
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if mkmk_lookup_names:
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lines.append("")
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lines.append("feature mkmk {")
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for _st in _NON_DEVA_SCRIPTS:
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lines.append(f" script {_st};")
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for ln in mkmk_lookup_names:
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lines.append(f" lookup {ln};")
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lines.append("} mkmk;")
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# For Devanagari, HarfBuzz's Indic v2 shaper uses abvm/blwm
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# features for mark positioning, not the generic 'mark' feature.
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# Register the same lookups under abvm for dev2 script.
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# Register the same lookups under abvm for both dev2 and deva scripts.
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lines.append("")
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lines.append("feature abvm {")
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lines.append(" script dev2;")
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for _st in ['dev2', 'deva']:
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lines.append(f" script {_st};")
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for ln in lookup_names:
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lines.append(f" lookup {ln};")
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for ln in mkmk_lookup_names:
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@@ -1826,80 +1872,111 @@ def _generate_anusvara_gpos(glyphs, has):
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lines.append(f" pos {glyph_name(anusvara_upper)} <150 0 0 0>;")
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lines.append(f"}} AnusvaraUpperShift3;")
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lines.append(f"lookup AnusvaraUpperShift3Down2 {{")
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lines.append(f" pos {glyph_name(anusvara_upper)} <150 -100 0 0>;")
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lines.append(f"}} AnusvaraUpperShift3Down2;")
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# --- Lookups for regular anusvara (uni0902) ---
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if has_regular:
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lines.append(f"lookup AnusvaraRegShift2 {{")
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lines.append(f" pos {glyph_name(anusvara)} <100 0 0 0>;")
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lines.append(f"}} AnusvaraRegShift2;")
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lines.append(f"lookup AnusvaraRegShift3Down2 {{")
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lines.append(f" pos {glyph_name(anusvara)} <150 -100 0 0>;")
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lines.append(f"}} AnusvaraRegShift3Down2;")
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# --- MarkToMark: anusvara attaches to complex reph ---
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# Without explicit MarkToMark, two marks on the same base get
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# shaper-specific heuristic stacking (HarfBuzz, DirectWrite, and
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# CoreText all disagree by ~100 units). MarkToMark gives the font
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# explicit control and suppresses those heuristics.
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has_mkmk = False
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if has(complex_reph):
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mkmk_lines = []
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if has_upper:
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mkmk_lines.append(
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f" markClass {glyph_name(anusvara_upper)}"
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f" <anchor 100 800> @anuUpperToReph;")
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if has_regular:
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mkmk_lines.append(
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f" markClass {glyph_name(anusvara)}"
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f" <anchor 150 800> @anuRegToReph;")
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if has_upper:
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mkmk_lines.append(
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f" pos mark {glyph_name(complex_reph)}"
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f" <anchor 150 800> mark @anuUpperToReph;")
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if has_regular:
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mkmk_lines.append(
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f" pos mark {glyph_name(complex_reph)}"
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f" <anchor 150 800> mark @anuRegToReph;")
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if mkmk_lines:
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lines.append("")
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lines.append("feature abvm {")
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lines.append(" script dev2;")
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lines.append("lookup AnusvaraToComplexReph {")
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lines.extend(mkmk_lines)
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lines.append("} AnusvaraToComplexReph;")
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has_mkmk = True
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# Collect contextual positioning rules into NAMED lookups so that
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# both dev2 and deva script sections reference the SAME lookup index.
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# Without this, feaLib creates separate anonymous lookups for each
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# script section, and shapers that merge both dev2/deva features
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# (CoreText, DirectWrite) would apply the shift TWICE.
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#
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# NOTE: complex_reph + anusvara cases are handled by MarkToMark
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# above (AnusvaraToComplexReph), NOT by ChainContextPos.
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abvm_rules = []
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|
||||
# --- Rules for anusvara upper (uF016C) ---
|
||||
# After reordering: base, [matras], reph?, anusvara.
|
||||
# When reph is present between matra and anusvara, use 3-glyph backtrack.
|
||||
# Rules ordered longest-context-first (first match wins).
|
||||
if has_upper:
|
||||
# Complex reph → always shift3down2 (directly before anusvara)
|
||||
if has(complex_reph):
|
||||
lines.append(
|
||||
f" pos {glyph_name(complex_reph)}"
|
||||
f" {glyph_name(anusvara_upper)}' lookup AnusvaraUpperShift3Down2;"
|
||||
)
|
||||
|
||||
# Matra + simple reph + anusvara (3-glyph context: matra in backtrack)
|
||||
if has(simple_reph):
|
||||
if has(0x094F):
|
||||
lines.append(
|
||||
abvm_rules.append(
|
||||
f" pos {glyph_name(0x094F)} {glyph_name(simple_reph)}"
|
||||
f" {glyph_name(anusvara_upper)}' lookup AnusvaraUpperShift3;"
|
||||
)
|
||||
for cp in [0x093A, 0x0948, 0x094C]:
|
||||
if has(cp):
|
||||
lines.append(
|
||||
abvm_rules.append(
|
||||
f" pos {glyph_name(cp)} {glyph_name(simple_reph)}"
|
||||
f" {glyph_name(anusvara_upper)}' lookup AnusvaraUpperShift2;"
|
||||
)
|
||||
|
||||
# Matra directly before anusvara (no reph)
|
||||
if has(0x094F):
|
||||
lines.append(
|
||||
abvm_rules.append(
|
||||
f" pos {glyph_name(0x094F)}"
|
||||
f" {glyph_name(anusvara_upper)}' lookup AnusvaraUpperShift3;"
|
||||
)
|
||||
for cp in [0x093A, 0x0948, 0x094C]:
|
||||
if has(cp):
|
||||
lines.append(
|
||||
abvm_rules.append(
|
||||
f" pos {glyph_name(cp)}"
|
||||
f" {glyph_name(anusvara_upper)}' lookup AnusvaraUpperShift2;"
|
||||
)
|
||||
|
||||
# --- Rules for regular anusvara (uni0902) ---
|
||||
# Regular anusvara has no matra trigger (else it would be upper).
|
||||
# Only reph can trigger a shift here.
|
||||
# Complex reph case handled by MarkToMark; only simple reph here.
|
||||
if has_regular:
|
||||
# Complex reph → +3px X, -2px Y
|
||||
if has(complex_reph):
|
||||
lines.append(
|
||||
f" pos {glyph_name(complex_reph)}"
|
||||
f" {glyph_name(anusvara)}' lookup AnusvaraRegShift3Down2;"
|
||||
)
|
||||
# Simple reph → +2px X
|
||||
if has(simple_reph):
|
||||
lines.append(
|
||||
abvm_rules.append(
|
||||
f" pos {glyph_name(simple_reph)}"
|
||||
f" {glyph_name(anusvara)}' lookup AnusvaraRegShift2;"
|
||||
)
|
||||
|
||||
# --- Emit named lookup ---
|
||||
if abvm_rules:
|
||||
lines.append("")
|
||||
lines.append("lookup AnusvaraCtxShift {")
|
||||
lines.extend(abvm_rules)
|
||||
lines.append("} AnusvaraCtxShift;")
|
||||
|
||||
lines.append("")
|
||||
lines.append("feature abvm {")
|
||||
for _st in ['dev2', 'deva']:
|
||||
lines.append(f" script {_st};")
|
||||
if has_mkmk:
|
||||
lines.append(" lookup AnusvaraToComplexReph;")
|
||||
if abvm_rules:
|
||||
lines.append(" lookup AnusvaraCtxShift;")
|
||||
lines.append("} abvm;")
|
||||
|
||||
return '\n'.join(lines)
|
||||
|
||||
Reference in New Issue
Block a user