From 519b7328b66c4c84f03893a31e4be5ba6b1395f2 Mon Sep 17 00:00:00 2001
From: mitchell <unknown>
Date: Sun, 11 Mar 2018 23:04:41 -0400
Subject: Added optional Lua lexer support. This support is disabled by default
 and must be enabled via compile-time option.

---
 lexlua/lisp.lua | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 lexlua/lisp.lua

(limited to 'lexlua/lisp.lua')

diff --git a/lexlua/lisp.lua b/lexlua/lisp.lua
new file mode 100644
index 000000000..bf74fc15c
--- /dev/null
+++ b/lexlua/lisp.lua
@@ -0,0 +1,65 @@
+-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
+-- Lisp LPeg lexer.
+
+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('lisp')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
+  defclass defconstant defgeneric define-compiler-macro define-condition
+  define-method-combination define-modify-macro define-setf-expander
+  define-symbol-macro defmacro defmethod defpackage defparameter defsetf
+  defstruct deftype defun defvar
+  abort assert block break case catch ccase cerror cond ctypecase declaim
+  declare do do* do-all-symbols do-external-symbols do-symbols dolist dotimes
+  ecase error etypecase eval-when flet handler-bind handler-case if
+  ignore-errors in-package labels lambda let let* locally loop macrolet
+  multiple-value-bind proclaim prog prog* prog1 prog2 progn progv provide
+  require restart-bind restart-case restart-name return return-from signal
+  symbol-macrolet tagbody the throw typecase unless unwind-protect when
+  with-accessors with-compilation-unit with-condition-restarts
+  with-hash-table-iterator with-input-from-string with-open-file
+  with-open-stream with-output-to-string with-package-iterator
+  with-simple-restart with-slots with-standard-io-syntax
+  t nil
+]]))
+
+local word = lexer.alpha * (lexer.alnum + '_' + '-')^0
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, word))
+
+-- Strings.
+lex:add_rule('string', token(lexer.STRING, "'" * word +
+                                           lexer.delimited_range('"')))
+
+-- Comments.
+local line_comment = ';' * lexer.nonnewline^0
+local block_comment = '#|' * (lexer.any - '|#')^0 * P('|#')^-1
+lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
+
+-- Numbers.
+lex:add_rule('number', token(lexer.NUMBER, P('-')^-1 * lexer.digit^1 *
+                                           (S('./') * lexer.digit^1)^-1))
+
+-- Entities.
+lex:add_rule('entity', token('entity', '&' * word))
+lex:add_style('entity', lexer.STYLE_VARIABLE)
+
+-- 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.OPERATOR, '{', '}')
+lex:add_fold_point(lexer.COMMENT, '#|', '|#')
+lex:add_fold_point(lexer.COMMENT, ';', lexer.fold_line_comments(';'))
+
+return lex
-- 
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