60 lines
1.9 KiB
Lua
60 lines
1.9 KiB
Lua
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-- Copyright 2006-2019 Robert Gieseke, Lars Otter. See License.txt.
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-- ConTeXt 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('context')
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-- TeX and ConTeXt mkiv environment definitions.
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local beginend = (P('begin') + 'end')
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local startstop = (P('start') + 'stop')
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-- Whitespace.
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local ws = token(lexer.WHITESPACE, lexer.space^1)
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lex:add_rule('whitespace', ws)
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-- Comments.
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local comment = token(lexer.COMMENT, '%' * lexer.nonnewline^0)
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lex:add_rule('comment', comment)
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-- Sections.
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local wm_section = word_match[[
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chapter part section subject subsection subsubject subsubsection subsubsubject
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subsubsubsection subsubsubsubject title
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]]
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local section = token(lexer.CLASS,
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'\\' * (wm_section + (startstop * wm_section)))
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lex:add_rule('section', section)
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-- TeX and ConTeXt mkiv environments.
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local environment = token(lexer.STRING,
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'\\' * (beginend + startstop) * lexer.alpha^1)
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lex:add_rule('environment', environment)
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-- Commands.
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local command = token(lexer.KEYWORD,
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'\\' * (lexer.alpha^1 * P('\\') * lexer.space^1 +
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lexer.alpha^1 +
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S('!"#$%&\',./;=[\\]_{|}~`^-')))
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lex:add_rule('command', command)
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-- Operators.
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local operator = token(lexer.OPERATOR, S('#$_[]{}~^'))
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lex:add_rule('operator', operator)
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-- Fold points.
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lex:add_fold_point('environment', '\\start', '\\stop')
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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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lex:add_fold_point(lexer.COMMENT, '%', lexer.fold_line_comments('%'))
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-- Embedded Lua.
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local luatex = lexer.load('lua')
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local luatex_start_rule = #P('\\startluacode') * environment
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local luatex_end_rule = #P('\\stopluacode') * environment
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lex:embed(luatex, luatex_start_rule, luatex_end_rule)
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return lex
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