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