1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
-- Copyright 2006-2017 Robert Gieseke. See LICENSE.
-- ConTeXt LPeg lexer.
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 = 'context'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local comment = token(l.COMMENT, '%' * l.nonnewline^0)
-- Commands.
local command = token(l.KEYWORD, '\\' * (l.alpha^1 + S('#$&~_^%{}')))
-- Sections.
local section = token('section', '\\' * word_match{
'part', 'chapter', 'section', 'subsection', 'subsubsection', 'title',
'subject', 'subsubject', 'subsubsubject'
})
-- ConTeXt environments.
local environment = token('environment', '\\' * (P('start') + 'stop') * l.word)
-- Operators.
local operator = token(l.OPERATOR, S('$&#{}[]'))
M._rules = {
{'whitespace', ws},
{'comment', comment},
{'environment', environment},
{'section', section},
{'keyword', command},
{'operator', operator},
}
M._tokenstyles = {
environment = l.STYLE_KEYWORD,
section = l.STYLE_CLASS
}
M._foldsymbols = {
_patterns = {'\\start', '\\stop', '[{}]', '%%'},
['environment'] = {['\\start'] = 1, ['\\stop'] = -1},
[l.OPERATOR] = {['{'] = 1, ['}'] = -1},
[l.COMMENT] = {['%'] = l.fold_line_comments('%')}
}
-- Embedded Lua.
local luatex = l.load('lua')
local luatex_start_rule = #P('\\startluacode') * environment
local luatex_end_rule = #P('\\stopluacode') * environment
l.embed_lexer(M, luatex, luatex_start_rule, luatex_end_rule)
return M
|
