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126 lines
2.6 KiB
126 lines
2.6 KiB
require_relative "../test_helper"
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require "lox/interpreter"
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require "lox/parser"
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require "lox/scanner"
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class TestInterpreter < Lox::Test
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def setup
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@scanner = Lox::Scanner.new
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@interpreter = Lox::Interpreter.new
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end
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# def test_literal
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# assert_evaluated(42.0, "42")
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# end
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def test_grouping
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assert_evaluated "42", "(42)"
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end
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def test_unary
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assert_evaluated "-42", "-42"
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assert_evaluated "false", "!42"
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assert_evaluated "false", "!true"
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assert_evaluated "true", "!false"
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assert_evaluated "true", "!nil"
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end
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def test_binary
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assert_evaluated "42", "100 - 58"
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assert_evaluated "42", "84 / 2"
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assert_evaluated "42", "21 * 2"
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# precedence
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assert_evaluated "42", "2 * 25 - 8"
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assert_evaluated "42", "40 + 2"
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assert_evaluated "42", "\"4\" + \"2\""
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assert_evaluated "true", "1 > 0"
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assert_evaluated "false", "0 > 0"
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assert_evaluated "false", "0 > 1"
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assert_evaluated "true", "1 >= 0"
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assert_evaluated "true", "0 >= 0"
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assert_evaluated "false", "0 >= 1"
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assert_evaluated "false", "1 < 0"
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assert_evaluated "false", "0 < 0"
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assert_evaluated "true", "0 < 1"
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assert_evaluated "false", "1 <= 0"
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assert_evaluated "true", "0 <= 0"
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assert_evaluated "true", "0 <= 1"
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assert_evaluated "true", "0 != 1"
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assert_evaluated "false", "0 != 0"
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assert_evaluated "false", "nil != nil"
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assert_evaluated "true", "nil != 1"
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assert_evaluated "false", "0 == 1"
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assert_evaluated "true", "0 == 0"
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assert_evaluated "true", "nil == nil"
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assert_evaluated "false", "nil == 1"
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end
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def test_errors
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[
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"-true",
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"12 > true",
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"true < 23",
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"false * 23",
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"false + 23",
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].each do |src|
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assert_raises Lox::RuntimeError do
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assert_evaluated nil, src
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end
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end
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end
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def test_stringify
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assert_evaluated "nil", "nil"
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assert_evaluated "42", "42"
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assert_evaluated "42.1", "42.1"
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assert_evaluated "foo", "\"foo\""
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end
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def test_multiple_statements
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assert_interpreted <<~EXPECTED.chomp, <<~SRC
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one
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true
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3
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EXPECTED
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print "one";
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print true;
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print 2 + 1;
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SRC
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end
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private
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def assert_interpreted(expected, src)
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output = with_stdout {
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stmts = Lox::Parser.new(@scanner.scan(src)).parse!
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@interpreter.interpret(stmts)
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}
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assert_equal expected, output
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end
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def assert_evaluated(expected, src)
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assert_interpreted(expected, "print #{src};")
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end
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def with_stdout
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original = $stdout
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$stdout = StringIO.new
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yield
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output = $stdout.string.chomp
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$stdout = original
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output
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end
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end
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