Intcode assembler: add tests
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@ -67,16 +67,39 @@ defmodule Assembler do
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it -> it
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end)
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IO.inspect(labels)
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# IO.inspect(labels)
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Enum.reverse(memory)
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end
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def repeat(_, 0), do: []
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def repeat(n, count), do: [n | repeat(n, count - 1)]
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@doc """
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Raises the base to to the given power.
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## Examples
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iex> Assembler.pow(10, 3)
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1000
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iex> Assembler.pow(5, 4)
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625
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"""
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def pow(base, 1), do: base
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def pow(base, exp), do: base * pow(base, exp - 1)
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@doc """
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Parses assembly instruction parameter values and modes.
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## Examples
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iex> Assembler.parse_params("1 2 3", [:read, :read, :read])
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{[1, 2, 3], 11100}
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iex> Assembler.parse_params("1 2 3", [:read, :read, :write])
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{[1, 2, 3], 1100}
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iex> Assembler.parse_params("1 2 $3", [:read, :read, :write])
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{[1, 2, 3], 1100}
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iex> Assembler.parse_params("$1 2 3", [:read, :read, :write])
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{[1, 2, 3], 1000}
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iex> Assembler.parse_params("$label 2 3", [:read, :read, :write])
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{[{:label, "label"}, 2, 3], 1000}
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iex> Assembler.parse_params("1 label 3", [:read, :read, :write])
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{[1, {:label, "label"}, 3], 1100}
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"""
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def parse_params(params, param_types) do
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params
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|> String.split(" ")
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@ -110,54 +133,130 @@ defmodule Assembler do
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end)
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end
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@doc """
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Assembles the given instruction and adds it to the memory (in reverse order).
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"""
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def assemble_instruction(insn, memory \\ [])
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@doc """
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Assemble add instruction.
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## Examples
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iex> Assembler.assemble_instruction("add 1 2 3")
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[3, 2, 1, 1101]
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"""
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def assemble_instruction("add " <> params, memory) do
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{[a, b, dest], modes} = parse_params(params, [:read, :read, :write])
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[dest, b, a, 1 + modes | memory]
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end
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@doc """
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Assemble multiply instruction.
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## Examples
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iex> Assembler.assemble_instruction("mul 1 2 3")
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[3, 2, 1, 1102]
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"""
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def assemble_instruction("mul " <> params, memory) do
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{[a, b, dest], modes} = parse_params(params, [:read, :read, :write])
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[dest, b, a, 2 + modes | memory]
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end
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@doc """
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Assemble halt instruction.
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## Examples
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iex> Assembler.assemble_instruction("hlt")
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[99]
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"""
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def assemble_instruction("hlt", memory) do
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[99 | memory]
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end
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@doc """
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Assemble input instruction.
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## Examples
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iex> Assembler.assemble_instruction("in 7")
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[7, 3]
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"""
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def assemble_instruction("in " <> params, memory) do
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{[dest], modes} = parse_params(params, [:write])
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[dest, 3 + modes | memory]
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end
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@doc """
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Assemble input instruction.
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## Examples
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iex> Assembler.assemble_instruction("out 7")
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[7, 104]
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iex> Assembler.assemble_instruction("out $7")
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[7, 4]
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"""
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def assemble_instruction("out " <> params, memory) do
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{[val], modes} = parse_params(params, [:read])
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[val, 4 + modes | memory]
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end
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@doc """
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Assemble jump-if-non-zero instruction.
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## Examples
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iex> Assembler.assemble_instruction("jnz 1 2")
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[2, 1, 105]
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iex> Assembler.assemble_instruction("jnz $var 2")
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[2, {:label, "var"}, 5]
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"""
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def assemble_instruction("jnz " <> params, memory) do
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{[target, dest], modes} = parse_params(params, [:read, :read])
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[dest, target, 5 + modes | memory]
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end
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@doc """
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Assemble jump-if-zero instruction.
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## Examples
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iex> Assembler.assemble_instruction("jez 1 2")
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[2, 1, 106]
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iex> Assembler.assemble_instruction("jez $var 2")
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[2, {:label, "var"}, 6]
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"""
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def assemble_instruction("jez " <> params, memory) do
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{[target, dest], modes} = parse_params(params, [:read, :read])
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[dest, target, 6 + modes | memory]
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end
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@doc """
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Assemble compare-less-than instruction.
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## Examples
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iex> Assembler.assemble_instruction("clt 1 2 3")
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[3, 2, 1, 1107]
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iex> Assembler.assemble_instruction("clt $1 $2 3")
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[3, 2, 1, 7]
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"""
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def assemble_instruction("clt " <> params, memory) do
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{[a, b, dest], modes} = parse_params(params, [:read, :read, :write])
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[dest, b, a, 7 + modes | memory]
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end
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@doc """
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Assemble compare-equal instruction.
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## Examples
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iex> Assembler.assemble_instruction("ceq 1 2 3")
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[3, 2, 1, 1108]
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iex> Assembler.assemble_instruction("ceq $1 $2 3")
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[3, 2, 1, 8]
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"""
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def assemble_instruction("ceq " <> params, memory) do
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{[a, b, dest], modes} = parse_params(params, [:read, :read, :write])
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@ -0,0 +1,71 @@
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defmodule AssemblerTest do
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use ExUnit.Case
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doctest Assembler
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test "assembles empty program" do
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assert Assembler.assemble("") == []
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end
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test "assembles simple program" do
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program = """
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add 1 2 10
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mul 2 3 11
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add $10 $11 12
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hlt
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"""
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assert Assembler.assemble(program) == [
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1101,
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1,
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2,
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10,
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1102,
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2,
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3,
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11,
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1,
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10,
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11,
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12,
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99
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]
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end
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test "assembles simple program with a label" do
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program = """
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add 1 2 10
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jnz $10 nonZero
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nonZero:
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hlt
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"""
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assert Assembler.assemble(program) == [
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1101,
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1,
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2,
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10,
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1005,
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10,
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7,
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99
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]
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end
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test "assembles a simple program with a data label" do
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program = """
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add 1 2 var
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out $var
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var: 0
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"""
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assert Assembler.assemble(program) == [
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1101,
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1,
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2,
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6,
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4,
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6,
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0
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]
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end
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end
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