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-- Copyright 2017 Alejandro Baez (https://keybase.io/baez). See LICENSE.
-- PICO-8 Lexer.
-- http://www.lexaloffle.com/pico-8.php
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 = 'pico8'}
-- Whitespace
local ws = token(l.WHITESPACE, l.space^1)
-- Comments
local comment = token(l.COMMENT, '//' * l.nonnewline_esc^0)
-- Numbers
local number = token(l.NUMBER, l.integer)
-- Keywords
local keyword = token(l.KEYWORD, word_match{
'__lua__', '__gfx__', '__gff__', '__map__', '__sfx__', '__music__'
})
-- Identifiers
local identifier = token(l.IDENTIFIER, l.word)
-- Operators
local operator = token(l.OPERATOR, S('_'))
M._rules = {
{'whitespace', ws},
{'keyword', keyword},
{'identifier', identifier},
{'comment', comment},
{'number', number},
{'operator', operator},
}
-- Embed Lua into PICO-8.
local lua = l.load('lua')
local lua_start_rule = token('pico8_tag', '__lua__')
local lua_end_rule = token('pico8_tag', '__gfx__' )
l.embed_lexer(M, lua, lua_start_rule, lua_end_rule)
M._tokenstyles = {
pico8_tag = l.STYLE_EMBEDDED
}
M._foldsymbols = lua._foldsymbols
return M
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