-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt. -- Plain TeX LPeg lexer. -- Modified by Robert Gieseke. local lexer = require('lexer') local token, word_match = lexer.token, lexer.word_match local P, R, S = lpeg.P, lpeg.R, lpeg.S local lex = lexer.new('tex') -- Whitespace. lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1)) -- Comments. lex:add_rule('comment', token(lexer.COMMENT, '%' * lexer.nonnewline^0)) -- TeX environments. lex:add_rule('environment', token('environment', '\\' * (P('begin') + 'end') * lexer.word)) lex:add_style('environment', lexer.STYLE_KEYWORD) -- Commands. lex:add_rule('command', token(lexer.KEYWORD, '\\' * (lexer.alpha^1 + S('#$&~_^%{}')))) -- Operators. lex:add_rule('operator', token(lexer.OPERATOR, S('$&#{}[]'))) -- Fold points. lex:add_fold_point(lexer.COMMENT, '%', lexer.fold_line_comments('%')) lex:add_fold_point('environment', '\\begin', '\\end') lex:add_fold_point(lexer.OPERATOR, '{', '}') return lex