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22 lines
1.3 KiB
TeX
22 lines
1.3 KiB
TeX
% ===== Tamil script support for the Tamil edition =====
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% Included AFTER preamble.tex (see build_pdf.sh). ElegantBook has no Tamil
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% language option, so the class runs in `lang=en` (English theorem names,
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% "Chapter"/"Contents" labels). Tamil rendering is purely a font concern:
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% the body/heading Latin fonts do not cover the Tamil block (U+0B80–U+0BFF),
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% and Noto Serif Tamil does not cover Latin — so we keep the book's default
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% Latin/CJK/symbol fonts and route ONLY Tamil codepoints to Noto Serif Tamil.
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%
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% ucharclasses inserts the begin/end code at every entry/exit of a Tamil run.
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% Wrapping in \begingroup…\endgroup means the exact surrounding style (bold in
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% headings, monospace in code) is restored for whatever follows a Tamil run.
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% Script=Tamil is REQUIRED: without it XeTeX applies default (Latin) shaping and
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% the complex-script reordering (pre-base vowels ெ/ே/ை, two-part vowels ொ/ோ/ௌ,
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% consonant conjuncts) is skipped, producing scrambled output.
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\usepackage{ucharclasses}
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\IfFontExistsTF{Noto Serif Tamil}{%
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\newfontfamily\tamilfont{Noto Serif Tamil}[Script=Tamil,Language=Tamil]%
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\setTransitionsFor{Tamil}{\begingroup\tamilfont}{\endgroup}%
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}{%
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\PackageWarning{tamil-fonts}{Noto Serif Tamil not found; Tamil text will not render.}%
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}
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