Import LPeg based lexers from Scintillua 3.6.1-1

These are Copyright (c) 2007-2015 Mitchell and released under the
MIT license.

1 files changed, 71 insertions, 0 deletions

diff --git a/lexers/dot.lua b/lexers/dot.lua
new file mode 100644
index 0000000..5ff845b
--- /dev/null
+++ b/lexers/dot.lua
@@ -0,0 +1,71 @@
+-- Copyright 2006-2013 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