Added optional Lua lexer support.

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

1 files changed, 39 insertions, 0 deletions

diff --git a/lexlua/json.lua b/lexlua/json.lua
new file mode 100644
index 000000000..d2b5cf35b
--- /dev/null
+++ b/lexlua/json.lua
@@ -0,0 +1,39 @@
+-- Copyright 2006-2018 Brian "Sir Alaran" Schott. See License.txt.
+-- JSON LPeg lexer.
+-- Based off of lexer code by Mitchell.
+
+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('json')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Strings.
+lex:add_rule('string', token(lexer.STRING, lexer.delimited_range("'", true) +
+                                           lexer.delimited_range('"', true)))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[true false null]]))
+
+-- Comments.
+local line_comment = '//' * lexer.nonnewline_esc^0
+local block_comment = '/*' * (lexer.any - '*/')^0 * P('*/')^-1
+lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
+
+-- Numbers.
+local integer = S('+-')^-1 * lexer.digit^1 * S('Ll')^-1
+lex:add_rule('number', token(lexer.NUMBER, lexer.float + integer))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR, S('[]{}:,')))
+
+-- Fold points.
+lex:add_fold_point(lexer.OPERATOR, '[', ']')
+lex:add_fold_point(lexer.OPERATOR, '{', '}')
+lex:add_fold_point(lexer.COMMENT, '/*', '*/')
+lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
+
+return lex