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64 lines
958 B
Ruby
64 lines
958 B
Ruby
module Assembler6502
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####
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## Represents a label
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class Label
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attr_reader :label, :address
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def self.parse_label(asm_line, address)
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sanitized = Assembler6502.sanitize_line(asm_line)
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match_data = sanitized.match(/#{Instruction::Sym}:/)
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unless match_data.nil?
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_, label = match_data.to_a
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self.new(label, address)
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else
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nil
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end
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end
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####
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## Create a label on an address
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def initialize(label, address)
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@label = label
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@address = address
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end
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####
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## Pretty print
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def to_s
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sprintf("%.4X | #{@label}", @address)
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end
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####
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## Labels take no space
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def length
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0
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end
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####
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## Emit bytes, (none)
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def emit_bytes
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[]
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end
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####
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## Mode
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def mode
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"label"
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end
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####
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## Description
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def description
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sprintf("Label pointing to $%.4X", @address)
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end
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end
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end
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