-- Copyright 2006-2018 Robert Gieseke. 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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-- Whitespace.
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Comments.
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lex:add_rule('comment', token(lexer.COMMENT, '%' * lexer.nonnewline^0))
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-- ConTeXt environments.
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local environment = token('environment', '\\' * (P('start') + 'stop') *
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lexer.word)
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lex:add_rule('environment', environment)
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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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chapter part section subject subsection subsubject subsubsection subsubsubject
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title
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]]))
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lex:add_style('section', lexer.STYLE_CLASS)
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-- Commands.
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local command = token('command', '\\' * (lexer.alpha^1 *
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('\\' * lexer.alpha^0)^-1 +
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S('#$&~_^%{}\\')))
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lex:add_rule('command', command)
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lex:add_style('command', lexer.STYLE_KEYWORD)
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S('$&#{}[]')))
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-- Fold points.
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lex:add_fold_point('environment', '\\start', '\\stop')
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lex:add_fold_point('command', '\\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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