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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.
48 lines
822 B
Ruby
48 lines
822 B
Ruby
require_relative '../instruction_base'
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module Assembler6502
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####
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## This is an .org directive
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class Org < InstructionBase
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attr_reader :address
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####
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## Try to parse an .org statement
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def self.parse(line)
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match_data = line.match(/^\.org\s+\$([0-9A-Fa-f]{4})$/)
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return nil if match_data.nil?
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address = match_data[1].to_i(16)
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Org.new(address)
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end
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####
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## Initialized with address to switch to
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def initialize(address)
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@address = address
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end
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####
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## Exec this directive on the assembler
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def exec(assembler)
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assembler.program_counter = address
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end
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####
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## Display
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def to_s
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if @address <= 0xff
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".org $%2.X" % @address
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else
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".org $%4.X" % @address
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end
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end
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end
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end
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