From 3570869c9ae2c4df14b15423789919e514322916 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc=20Andr=C3=A9=20Tanner?= <mat@brain-dump.org>
Date: Wed, 7 Dec 2016 16:49:29 +0100
Subject: Move all lua related files to lua/ subfolder

Also remove the lexers sub directory from the Lua search path.
As a result we attempt to open fewer files during startup:

 $ strace -e open -o log ./vis +q config.h && wc -l log

In order to avoid having to modifiy all lexers which `require('lexer')`
we instead place a symlink in the top level directory.

 $ ./configure --disable-lua
 $ rm -rf lua

Should result in a source tree with most lua specifc functionality
removed.
---
 lua/lexers/dart.lua | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 lua/lexers/dart.lua

(limited to 'lua/lexers/dart.lua')

diff --git a/lua/lexers/dart.lua b/lua/lexers/dart.lua
new file mode 100644
index 0000000..c237128
--- /dev/null
+++ b/lua/lexers/dart.lua
@@ -0,0 +1,77 @@
+-- Dart LPeg lexer.
+-- Written by Brian Schott (@Hackerpilot on Github).
+
+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 = 'dart'}
+
+-- Whitespace.
+local ws = token(l.WHITESPACE, l.space^1)
+
+-- Comments.
+local line_comment = '//' * l.nonnewline_esc^0
+local nested_comment = l.nested_pair('/*', '*/')
+local comment = token(l.COMMENT, line_comment + nested_comment)
+
+-- Strings.
+local sq_str = S('r')^-1 * l.delimited_range("'", true)
+local dq_str = S('r')^-1 * l.delimited_range('"', true)
+local sq_str_multiline = S('r')^-1 * l.delimited_range('"""')
+local dq_str_multiline = S('r')^-1 * l.delimited_range("''' ")
+local string = token(l.STRING,
+                     sq_str + dq_str + sq_str_multiline + dq_str_multiline)
+
+-- Numbers.
+local number = token(l.NUMBER, (l.float + l.hex_num))
+
+-- Keywords.
+local keyword = token(l.KEYWORD, word_match{
+  'assert', 'break', 'case', 'catch', 'class', 'const', 'continue', 'default',
+  'do', 'else', 'enum', 'extends', 'false', 'final' , 'finally', 'for', 'if',
+  'in', 'is', 'new', 'null', 'rethrow', 'return', 'super', 'switch', 'this',
+  'throw', 'true', 'try', 'var', 'void', 'while', 'with',
+})
+
+local builtin_identifiers = token(l.CONSTANT, word_match{
+  'abstract', 'as', 'dynamic', 'export', 'external', 'factory', 'get',
+  'implements', 'import', 'library', 'operator', 'part', 'set', 'static',
+  'typedef'
+})
+
+-- Identifiers.
+local identifier = token(l.IDENTIFIER, l.word)
+
+-- Operators.
+local operator = token(l.OPERATOR, S('#?=!<>+-*$/%&|^~.,;()[]{}'))
+
+-- Preprocs.
+local annotation = token('annotation', '@' * l.word^1)
+
+M._rules = {
+  {'whitespace', ws},
+  {'keyword', keyword},
+  {'constant', builtin_identifiers},
+  {'string', string},
+  {'identifier', identifier},
+  {'comment', comment},
+  {'number', number},
+  {'operator', operator},
+  {'annotation', annotation},
+}
+
+M._tokenstyles = {
+  annotation = l.STYLE_PREPROCESSOR,
+}
+
+M._foldsymbols = {
+  _patterns = {'[{}]', '/[*+]', '[*+]/', '//'},
+  [l.OPERATOR] = {['{'] = 1, ['}'] = -1},
+  [l.COMMENT] = {
+    ['/*'] = 1, ['*/'] = -1, ['/+'] = 1, ['+/'] = -1,
+    ['//'] = l.fold_line_comments('//')
+  }
+}
+
+return M
-- 
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