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use pattern matching

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This commit is contained in:
Mark Canlas 2020-08-12 22:06:22 -04:00
parent ed46753f8e
commit 972fa77d10
1 changed files with 14 additions and 14 deletions
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28
src/main/scala/com/htmlism/MatchOpcodes.scala
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@ -273,23 +273,23 @@ object MatchOpcodes {
Seq(NoInstruction, BIT, NoInstruction, NoInstruction, STY, LDY, CPY, CPX)(aaa)
val addressingMode =
instruction match {
case BIT =>
Seq(NoMode, ZeroPage, NoMode, Absolute, NoMode, NoMode, NoMode, NoMode)(bbb)
Seq(Immediate, ZeroPage, NoMode, Absolute, NoMode, ZeroPageX, NoMode, AbsoluteX)(bbb)
case STY =>
Seq(NoMode, ZeroPage, NoMode, Absolute, NoMode, ZeroPageX, NoMode, NoMode)(bbb)
(instruction, addressingMode) match {
case (BIT, ZeroPage | Absolute) =>
(instruction -> addressingMode).some
case LDY =>
Seq(Immediate, ZeroPage, NoMode, Absolute, NoMode, ZeroPageX, NoMode, AbsoluteX)(bbb)
case (STY, ZeroPage | Absolute | ZeroPageX) =>
(instruction -> addressingMode).some
case _ =>
Seq(Immediate, ZeroPage, NoMode, Absolute, NoMode, NoMode, NoMode, NoMode)(bbb)
}
case (LDY, Immediate | ZeroPage | Absolute | ZeroPageX | AbsoluteX) =>
(instruction -> addressingMode).some
if (instruction == NoInstruction || addressingMode == NoMode)
None
else
(instruction -> addressingMode).some
case (CPY | CPX, Immediate | ZeroPage | Absolute) =>
(instruction -> addressingMode).some
case _ =>
None
}
}
}