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-- Copyright 2006-2017 Mitchell mitchell.att.foicica.com. See LICENSE.
-- Plain TeX LPeg lexer.
-- Modified by Robert Gieseke.
local l = require('lexer')
local token, word_match = l.token, l.word_match
local P, R, S = lpeg.P, lpeg.R, lpeg.S
local M = {_NAME = 'tex'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local comment = token(l.COMMENT, '%' * l.nonnewline^0)
-- TeX environments.
local environment = token('environment', '\\' * (P('begin') + 'end') * l.word)
-- Commands.
local command = token(l.KEYWORD, '\\' * (l.alpha^1 + S('#$&~_^%{}')))
-- Operators.
local operator = token(l.OPERATOR, S('$&#{}[]'))
M._rules = {
{'whitespace', ws},
{'comment', comment},
{'environment', environment},
{'keyword', command},
{'operator', operator},
}
M._tokenstyles = {
environment = l.STYLE_KEYWORD
}
M._foldsymbols = {
_patterns = {'\\begin', '\\end', '[{}]', '%%'},
[l.COMMENT] = {['%'] = l.fold_line_comments('%')},
['environment'] = {['\\begin'] = 1, ['\\end'] = -1},
[l.OPERATOR] = {['{'] = 1, ['}'] = -1}
}
return M
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