You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
67 lines
1.6 KiB
67 lines
1.6 KiB
2 years ago
|
require_relative "../test_helper"
|
||
|
|
|
||
|
|
require "lox/ast_printer"
|
||
|
|
require "lox/parser"
|
||
|
|
require "lox/scanner"
|
||
|
|
require "lox/token"
|
||
|
|
|
||
|
|
class TestParser < Lox::Test
|
||
|
|
def setup
|
||
|
|
@ast_printer = Lox::AstPrinter.new
|
||
|
|
@scanner = Lox::Scanner.new
|
||
|
|
end
|
||
|
|
|
||
|
|
def test_expression
|
||
|
|
assert_parsed "(== 4.0 (>= 2.0 1.0))", :expression, "4 == 2 >= 1"
|
||
|
|
end
|
||
|
|
|
||
|
|
def test_term
|
||
|
|
assert_parsed "(+ 4.0 (/ 2.0 1.0))", :term, "4 + 2 / 1"
|
||
|
|
end
|
||
|
|
|
||
|
|
def test_factor
|
||
|
|
assert_parsed "(/ 4.0 (- 2.0))", :factor, "4 / -2"
|
||
|
|
assert_parsed "(* 4.0 2.0)", :factor, "4 * 2"
|
||
|
|
assert_parsed "(- 2.0)", :factor, "-2"
|
||
|
|
end
|
||
|
|
|
||
|
|
def test_unary
|
||
|
|
assert_parsed "(! 42.0)", :unary, "!42"
|
||
|
|
assert_parsed "(- 42.0)", :unary, "-42"
|
||
|
|
assert_parsed "42.0", :unary, "42"
|
||
|
|
end
|
||
|
|
|
||
|
|
def test_primary
|
||
|
|
assert_parsed "false", :primary, "false"
|
||
|
|
assert_parsed "true", :primary, "true"
|
||
|
|
assert_parsed "nil", :primary, "nil"
|
||
|
|
assert_parsed "42.0", :primary, "42"
|
||
|
|
assert_parsed "foo", :primary, "\"foo\""
|
||
|
|
assert_parsed "(group foo)", :primary, "(\"foo\")"
|
||
|
|
end
|
||
|
|
|
||
|
|
def test_errors
|
||
|
|
e = assert_raises Lox::ParseError do
|
||
|
|
parse("(42", :primary)
|
||
|
|
end
|
||
|
|
assert_equal "[line 1] Error at end: Expect ')' after expression.", e.message
|
||
|
|
|
||
|
|
e = assert_raises Lox::ParseError do
|
||
|
|
parse("foo foo", :primary)
|
||
|
|
end
|
||
|
|
assert_equal "[line 1] Error at 'foo': Expect expression.", e.message
|
||
|
|
end
|
||
|
|
|
||
|
|
private
|
||
|
|
|
||
|
|
def parse(src, name)
|
||
|
|
tokens = @scanner.scan(src)
|
||
|
|
Lox::Parser::State.new(tokens).send(name)
|
||
|
|
end
|
||
|
|
|
||
|
|
def assert_parsed(expected, name, src)
|
||
|
|
expr = parse(src, name)
|
||
|
|
assert_equal expected, @ast_printer.print(expr)
|
||
|
|
end
|
||
|
|
end
|