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2c938f7312
bank management, Use of promises to resolve symbols that are used before they are defined. A base class for all instructions and assembler directives. Hopefully my scoped symbols can be used to create C like data structures in the zero page, ie sprite.x New code to prodce the final ROM. Basically everything was rewritten.
50 lines
967 B
Ruby
50 lines
967 B
Ruby
require_relative '../instruction_base'
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module Assembler6502
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####
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## This directive to include bytes
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class Bytes < InstructionBase
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####
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## Try to parse an incbin directive
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def self.parse(line)
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match_data = line.match(/^\.bytes\s+(.+)$/)
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return nil if match_data.nil?
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bytes_array = match_data[1].split(',').map do |byte_string|
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number = byte_string.gsub('$', '')
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integer = number.to_i(16)
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fail(SyntaxError, "#{integer} is too large for one byte") if integer > 0xff
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integer
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end
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Bytes.new(bytes_array)
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end
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####
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## Initialize with filename
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def initialize(bytes_array)
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@bytes_array = bytes_array
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end
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####
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## Execute on the assembler
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def exec(assembler)
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assembler.write_memory(@bytes_array)
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end
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####
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## Display, I don't want to write all these out
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def to_s
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".bytes (#{@bytes_array.length})"
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end
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end
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end
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