30 lines
1.2 KiB
Lua
30 lines
1.2 KiB
Lua
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-- Copyright 2015-2019 David B. Lamkins <david@lamkins.net>. See License.txt.
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-- man/roff LPeg lexer.
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local lexer = require('lexer')
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local token, word_match = lexer.token, lexer.word_match
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local P, R, S = lpeg.P, lpeg.R, lpeg.S
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local lex = lexer.new('man')
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-- Whitespace.
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Markup.
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lex:add_rule('rule1', token(lexer.STRING, '.' * ('B' * P('R')^-1 +
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'I' * P('PR')^-1) *
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lexer.nonnewline^0))
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lex:add_rule('rule2', token(lexer.NUMBER, '.' * S('ST') * 'H' *
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lexer.nonnewline^0))
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lex:add_rule('rule3', token(lexer.KEYWORD, P('.br') + '.DS' + '.RS' + '.RE' +
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'.PD'))
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lex:add_rule('rule4', token(lexer.LABEL, '.' * (S('ST') * 'H' + '.TP')))
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lex:add_rule('rule5', token(lexer.VARIABLE, '.B' * P('R')^-1 +
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'.I' * S('PR')^-1 +
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'.PP'))
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lex:add_rule('rule6', token(lexer.TYPE, '\\f' * S('BIPR')))
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lex:add_rule('rule7', token(lexer.PREPROCESSOR, lexer.starts_line('.') *
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lexer.alpha^1))
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return lex
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