/usr/share/vis/lexers/dot.lua is in vis 0.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 60 61 62 63 64 65 66 67 68 69 70 71 | -- Copyright 2006-2017 Brian "Sir Alaran" Schott. See LICENSE.
-- Dot LPeg lexer.
-- Based off of lexer code by Mitchell.
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 = 'dot'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local line_comment = '//' * l.nonnewline_esc^0
local block_comment = '/*' * (l.any - '*/')^0 * P('*/')^-1
local comment = token(l.COMMENT, line_comment + block_comment)
-- Strings.
local sq_str = l.delimited_range("'")
local dq_str = l.delimited_range('"')
local string = token(l.STRING, sq_str + dq_str)
-- Numbers.
local number = token(l.NUMBER, l.digit^1 + l.float)
-- Keywords.
local keyword = token(l.KEYWORD, word_match{
'graph', 'node', 'edge', 'digraph', 'fontsize', 'rankdir',
'fontname', 'shape', 'label', 'arrowhead', 'arrowtail', 'arrowsize',
'color', 'comment', 'constraint', 'decorate', 'dir', 'headlabel', 'headport',
'headURL', 'labelangle', 'labeldistance', 'labelfloat', 'labelfontcolor',
'labelfontname', 'labelfontsize', 'layer', 'lhead', 'ltail', 'minlen',
'samehead', 'sametail', 'style', 'taillabel', 'tailport', 'tailURL', 'weight',
'subgraph'
})
-- Types.
local type = token(l.TYPE, word_match{
'box', 'polygon', 'ellipse', 'circle', 'point', 'egg', 'triangle',
'plaintext', 'diamond', 'trapezium', 'parallelogram', 'house', 'pentagon',
'hexagon', 'septagon', 'octagon', 'doublecircle', 'doubleoctagon',
'tripleoctagon', 'invtriangle', 'invtrapezium', 'invhouse', 'Mdiamond',
'Msquare', 'Mcircle', 'rect', 'rectangle', 'none', 'note', 'tab', 'folder',
'box3d', 'record'
})
-- Identifiers.
local identifier = token(l.IDENTIFIER, l.word)
-- Operators.
local operator = token(l.OPERATOR, S('->()[]{};'))
M._rules = {
{'whitespace', ws},
{'comment', comment},
{'keyword', keyword},
{'type', type},
{'identifier', identifier},
{'number', number},
{'string', string},
{'operator', operator},
}
M._foldsymbols = {
_patterns = {'[{}]', '/%*', '%*/', '//'},
[l.OPERATOR] = {['{'] = 1, ['}'] = -1},
[l.COMMENT] = {['/*'] = 1, ['*/'] = -1, ['//'] = l.fold_line_comments('//')}
}
return M
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