46 lines
1.5 KiB
Lua
46 lines
1.5 KiB
Lua
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-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Bibtex 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('bibtex')
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-- Whitespace.
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local ws = token(lexer.WHITESPACE, lexer.space^1)
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-- Fields.
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lex:add_rule('field', token('field', word_match[[
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author title journal year volume number pages month note key publisher editor
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series address edition howpublished booktitle organization chapter school
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institution type isbn issn affiliation issue keyword url
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]]))
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lex:add_style('field', lexer.STYLE_CONSTANT)
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
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-- Strings.
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lex:add_rule('string', token(lexer.STRING,
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lexer.delimited_range('"') +
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lexer.delimited_range('{}', false, true, true)))
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S(',=')))
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-- Embedded in Latex.
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local latex = lexer.load('latex')
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-- Embedded Bibtex.
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local entry = token('entry', P('@') * word_match([[
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book article booklet conference inbook incollection inproceedings manual
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mastersthesis lambda misc phdthesis proceedings techreport unpublished
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]], true))
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lex:add_style('entry', lexer.STYLE_PREPROCESSOR)
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local bibtex_start_rule = entry * ws^0 * token(lexer.OPERATOR, P('{'))
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local bibtex_end_rule = token(lexer.OPERATOR, P('}'))
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latex:embed(lex, bibtex_start_rule, bibtex_end_rule)
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return lex
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