lexers/bibtex.lua

   1 -- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
   2 -- Bibtex LPeg lexer.
   3
   4 local l = require('lexer')
   5 local token, word_match = l.token, l.word_match
   6 local P, R, S = lpeg.P, lpeg.R, lpeg.S
   7
   8 local M = {_NAME = 'bibtex'}
   9
  10 -- Whitespace.
  11 local ws = token(l.WHITESPACE, l.space^1)
  12
  13 -- Strings.
  14 local string = token(l.STRING, l.delimited_range('"') +
  15                                l.delimited_range('{}', false, true, true))
  16
  17 -- Fields.
  18 local field = token('field', word_match{
  19   'author', 'title', 'journal', 'year', 'volume', 'number', 'pages', 'month',
  20   'note', 'key', 'publisher', 'editor', 'series', 'address', 'edition',
  21   'howpublished', 'booktitle', 'organization', 'chapter', 'school',
  22   'institution', 'type', 'isbn', 'issn', 'affiliation', 'issue', 'keyword',
  23   'url'
  24 })
  25
  26 -- Identifiers.
  27 local identifier = token(l.IDENTIFIER, l.word)
  28
  29 -- Operators.
  30 local operator = token(l.OPERATOR, S(',='))
  31
  32 M._rules = {
  33   {'whitespace', ws},
  34   {'field', field},
  35   {'identifier', identifier},
  36   {'string', string},
  37   {'operator', operator},
  38 }
  39
  40 -- Embedded in Latex.
  41 local latex = l.load('latex')
  42
  43 -- Embedded Bibtex.
  44 local entry = token('entry', P('@') * word_match({
  45   'book', 'article', 'booklet', 'conference', 'inbook', 'incollection',
  46   'inproceedings', 'manual', 'mastersthesis', 'lambda', 'misc', 'phdthesis',
  47   'proceedings', 'techreport', 'unpublished'
  48 }, nil, true))
  49 local bibtex_start_rule = entry * ws^0 * token(l.OPERATOR, P('{'))
  50 local bibtex_end_rule = token(l.OPERATOR, P('}'))
  51 l.embed_lexer(latex, M, bibtex_start_rule, bibtex_end_rule)
  52
  53 M._tokenstyles = {
  54   field = l.STYLE_CONSTANT,
  55   entry = l.STYLE_PREPROCESSOR
  56 }
  57
  58 return M