1ddfe24338
Although this construct is in violation of the `ignore sub` grammar given by the current OpenType Feature File syntax specification, the very same specification document illustrates (in example 3 of section 5.f.ii) the `ignore sub` statement with a comma-separated list of backgrack/input/lookahead triples. See https://github.com/adobe-type-tools/afdko/issues/105 for a request to amend the OpenType Feature File syntax specification. After this code change, feaLib can now parse testdata/spec5f_ii_3.fea; the output is identical to what is generated by Adobe's makeotf tool. https://github.com/behdad/fonttools/issues/503
10 lines
326 B
Plaintext
10 lines
326 B
Plaintext
# OpenType Feature File specification, section 5.f.ii, example 3
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# "Specifying exceptions to the Chain Sub rule"
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# http://www.adobe.com/devnet/opentype/afdko/topic_feature_file_syntax.html
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feature test {
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@LETTER = [a-z];
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ignore substitute @LETTER a' n' d', a' n' d' @LETTER;
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substitute a' n' d' by a_n_d;
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} test;
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