Added optional Lua lexer support.

This support is disabled by default and must be enabled via compile-time option.

1 files changed, 57 insertions, 0 deletions

diff --git a/lexlua/dart.lua b/lexlua/dart.lua
new file mode 100644
index 000000000..4a2c43b57
--- /dev/null
+++ b/lexlua/dart.lua
@@ -0,0 +1,57 @@
+-- Copyright 2013-2018 Mitchell mitchell.att.foicica.com. See License.txt.
+-- Dart LPeg lexer.
+-- Written by Brian Schott (@Hackerpilot on Github).
+
+local lexer = require('lexer')
+local token, word_match = lexer.token, lexer.word_match
+local P, R, S = lpeg.P, lpeg.R, lpeg.S
+
+local lex = lexer.new('dart')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.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
+]]))
+
+-- Built-ins.
+lex:add_rule('builtin', token(lexer.CONSTANT, word_match[[
+  abstract as dynamic export external factory get implements import library
+  operator part set static typedef
+]]))
+
+-- Strings.
+local sq_str = S('r')^-1 * lexer.delimited_range("'", true)
+local dq_str = S('r')^-1 * lexer.delimited_range('"', true)
+local sq_str_multiline = S('r')^-1 * "'''" * (lexer.any - "'''")^0 * P("'''")^-1
+local dq_str_multiline = S('r')^-1 * '"""' * (lexer.any - '"""')^0 * P('"""')^-1
+lex:add_rule('string', token(lexer.STRING, sq_str_multiline + dq_str_multiline +
+                                           sq_str + dq_str))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
+
+-- Comments.
+lex:add_rule('comment', token(lexer.COMMENT, '//' * lexer.nonnewline_esc^0 +
+                                             lexer.nested_pair('/*', '*/')))
+
+-- Numbers.
+lex:add_rule('number', token(lexer.NUMBER, lexer.float + lexer.hex_num))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR, S('#?=!<>+-*$/%&|^~.,;()[]{}')))
+
+-- Annotations.
+lex:add_rule('annotation', token('annotation', '@' * lexer.word^1))
+lex:add_style('annotation', lexer.STYLE_PREPROCESSOR)
+
+-- Fold points.
+lex:add_fold_point(lexer.OPERATOR, '{', '}')
+lex:add_fold_point(lexer.COMMENT, '/*', '*/')
+lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
+
+return lex