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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.
46 lines
856 B
Ruby
46 lines
856 B
Ruby
require_relative '../instruction_base'
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module Assembler6502
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####
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## This directive instruction can include a binary file
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class Segment < InstructionBase
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####
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## Try to parse a dw directive
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def self.parse(line)
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match_data = line.match(/^.segment (prog|char) (\d+)$/i)
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unless match_data.nil?
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_, segment, bank = match_data.to_a
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return Segment.new(segment, bank.to_i)
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end
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nil
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end
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####
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## Initialize with filename
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def initialize(segment, bank)
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@bank = bank
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@segment = segment
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end
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####
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## Execute the segment and bank change on the assembler
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def exec(assembler)
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assembler.current_segment = @segment
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assembler.current_bank = @bank
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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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".segment #{@segment} #{@bank}"
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end
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end
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end
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