59 lines
2.1 KiB
Lua
59 lines
2.1 KiB
Lua
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-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Latex LPeg lexer.
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-- Modified by Brian Schott.
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-- Modified by Robert Gieseke.
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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('latex')
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-- Whitespace.
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Comments.
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local line_comment = '%' * lexer.nonnewline^0
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local block_comment = '\\begin' * P(' ')^0 * '{comment}' *
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(lexer.any - '\\end' * P(' ')^0 * '{comment}')^0 *
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P('\\end' * P(' ')^0 * '{comment}')^-1
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lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
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-- Math environments.
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local math_word = word_match[[
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align displaymath eqnarray equation gather math multline
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]]
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local math_begin_end = (P('begin') + P('end')) * P(' ')^0 *
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'{' * math_word * P('*')^-1 * '}'
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lex:add_rule('math', token('math', '$' + '\\' * (S('[]()') + math_begin_end)))
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lex:add_style('math', lexer.STYLE_FUNCTION)
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-- LaTeX environments.
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lex:add_rule('environment', token('environment', '\\' *
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(P('begin') + P('end')) *
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P(' ')^0 * '{' * lexer.word *
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P('*')^-1 * '}'))
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lex:add_style('environment', lexer.STYLE_KEYWORD)
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-- Sections.
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lex:add_rule('section', token('section', '\\' * word_match[[
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part chapter section subsection subsubsection paragraph subparagraph
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]] * P('*')^-1))
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lex:add_style('section', lexer.STYLE_CLASS)
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-- Commands.
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lex:add_rule('command', token('command', '\\' *
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(lexer.alpha^1 + S('#$&~_^%{}'))))
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lex:add_style('command', lexer.STYLE_KEYWORD)
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S('&#{}[]')))
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-- Fold points.
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lex:add_fold_point(lexer.COMMENT, '\\begin', '\\end')
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lex:add_fold_point(lexer.COMMENT, '%', lexer.fold_line_comments('%'))
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lex:add_fold_point('environment', '\\begin', '\\end')
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lex:add_fold_point(lexer.OPERATOR, '{', '}')
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return lex
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