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/pico8.lua b/lexlua/pico8.lua
new file mode 100644
index 000000000..9e70802c3
--- /dev/null
+++ b/lexlua/pico8.lua
@@ -0,0 +1,39 @@
+-- Copyright 2016-2018 Alejandro Baez (https://keybase.io/baez). See License.txt.
+-- PICO-8 lexer.
+-- http://www.lexaloffle.com/pico-8.php
+
+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('pico8')
+
+-- Whitespace
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
+  __lua__ __gfx__ __gff__ __map__ __sfx__ __music__
+]]))
+
+-- Identifiers
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
+
+-- Comments
+lex:add_rule('comment', token(lexer.COMMENT, '//' * lexer.nonnewline_esc^0))
+
+-- Numbers
+lex:add_rule('number', token(lexer.NUMBER, lexer.integer))
+
+-- Operators
+lex:add_rule('operator', token(lexer.OPERATOR, S('_')))
+
+-- Embed Lua into PICO-8.
+local lua = lexer.load('lua')
+
+local lua_start_rule = token('pico8_tag', '__lua__')
+local lua_end_rule = token('pico8_tag', '__gfx__' )
+lex:embed(lua, lua_start_rule, lua_end_rule)
+lex:add_style('pico8_tag', lexer.STYLE_EMBEDDED)
+
+return lex