Class: N65::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/n65/parser.rb

Overview

This class determines what sort of line of code we

are dealing with, parses one line, and returns an 
object deriving from InstructionBase

Defined Under Namespace

Classes: CannotParse

Constant Summary collapse

Directives = 
[INESHeader, Org, Segment, IncBin, Inc, DW, Bytes, ASCII, EnterScope, ExitScope, Space]

Class Method Summary collapse

Class Method Details

.parse(line) ⇒ Object

Parses a line of program source into an object

deriving from base class InstructionBase



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# File 'lib/n65/parser.rb', line 35

def self.parse(line)
  sanitized = sanitize_line(line)
  return nil if sanitized.empty?

  ##  First check to see if we have a label.
  label = Label.parse(sanitized)
  unless label.nil?
    return label
  end

  ##  Now check if we have a directive
  directive = parse_directive(sanitized)
  unless directive.nil?
    return directive
  end

  ##  Now, surely it is an asm instruction?
  instruction = Instruction.parse(sanitized)
  unless instruction.nil?
    return instruction
  end

  ##  Guess not, we have no idea
  fail(CannotParse, sanitized)
end