def test_read_number(self):
token_stream = TokenStream(InputStream('123='))
result = token_stream._read_number()
self.assertEqual(Token('num', 123.0), result)
token_stream = TokenStream(InputStream('123.3.='))
result = token_stream._read_number()
self.assertEqual(Token('num', 123.3), result)
def test_read_string(self):
token_stream = TokenStream(InputStream('"ab"'))
result = token_stream._read_string()
self.assertEqual(Token('str', 'ab'), result)
token_stream = TokenStream(InputStream('"ab\\c"'))
result = token_stream._read_string()
self.assertEqual(Token('str', 'abc'), result)
token_stream = TokenStream(InputStream('"abc'))
with self.assertRaises(Exception):
token_stream._read_string()
def test04(self):
"""Test token seek and tell."""
filepath = os.path.join(TokenStreamTest.path, 'obj_stream3.dat')
with open(filepath, 'rb') as f:
tk = TokenStream(filepath, f)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(98, tok.data)
# Memorize position after doing a first next_token(), this works
xpos = tk.tell()
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(73, tok.data)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(5, tok.data)
tk.seek(xpos)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(73, tok.data)
def test_read_ident(self):
token_stream = TokenStream(InputStream('a=1'))
result = token_stream._read_identifier()
self.assertEqual(Token('var', 'a=1'), result)
token_stream = TokenStream(InputStream('a = 1'))
result = token_stream._read_identifier()
self.assertEqual(Token('var', 'a'), result)
token_stream = TokenStream(InputStream('let(a = 1'))
result = token_stream._read_identifier()
self.assertEqual(Token('kw', 'let'), result)
token_stream = TokenStream(InputStream('js "aaa"'))
result = token_stream._read_identifier()
self.assertEqual(Token('kw', 'js'), result)
def main():
code = "sum = lambda(x, y) x + y; print(sum(2, 3));"
code = """
fib = λ(n) if n < 2 then n else fib(n - 1) + fib(n - 2);
time( λ() println(fib(25)) );
"""
code = """
sum = lambda(n, ret)
if n == 0 then ret
else sum(n - 1, ret + n);
time(lambda() println(sum(50000, 0)));
"""
code = """
println("foo");
halt();
println("bar");
"""
global_env = Environment()
for name, func in primitive.items():
global_env.define(name, func)
with open(sys.argv[1]) as file:
code = file.read()
parser = Parser(TokenStream(InputStream(code)))
execute(evaluate, (parser(), global_env,
lambda result: print(f"*** Result: {result}")))
def main():
with open(sys.argv[1]) as file:
code = file.read()
# code = 'let foo(x = 1, y = 1) foo(x + y)'
# code = 'lambda foo(x) x'
parser = Parser(TokenStream(InputStream(code)))
js_code = to_js(parser())
print(js_code)
def main():
global_env = Environment()
for name, func in primitive.items():
global_env.define(name, func)
lambda_file_path = sys.argv[1]
with open(lambda_file_path) as file:
code = file.read()
parser = Parser(TokenStream(InputStream(code)))
evaluate(parser(), global_env)
def test_read_next(self):
token_stream = TokenStream(
InputStream(' # comment\n123 abc "nba" let a=2 >= js;'))
self.assertEqual(token_stream._read_next(), Token('num', 123.0))
self.assertEqual(token_stream._read_next(), Token('var', 'abc'))
self.assertEqual(token_stream._read_next(), Token('str', 'nba'))
self.assertEqual(token_stream._read_next(), Token('kw', 'let'))
self.assertEqual(token_stream._read_next(), Token('var', 'a=2'))
self.assertEqual(token_stream._read_next(), Token('op', '>='))
self.assertEqual(token_stream._read_next(), Token('kw', 'js'))
self.assertEqual(token_stream._read_next(), Token('punc', ';'))
self.assertEqual(token_stream._read_next(), Token('null', 'null'))
token_stream = TokenStream(InputStream('\x08'))
with self.assertRaises(Exception):
token_stream._read_next()
token_stream = TokenStream(InputStream('λ (n) 1'))
self.assertEqual(token_stream._read_next(), Token("kw", 'λ'))
def main():
with open(sys.argv[1]) as file:
code = file.read()
parser = Parser(TokenStream(InputStream(code)))
cps_code = to_cps(parser(), lambda ast: CallAst(
VarAst('β_TOPLEVEL'),
[ast],
))
print(cps_code)
def test05(self):
"""Test error from flex & bison book."""
filepath = os.path.join(TokenStreamTest.path, 'flex0.dat')
with open(filepath, 'rb') as f:
tk = TokenStream(filepath, f)
tok = tk.next_token()
self.assertEqual(EToken.LITERAL_STRING, tok.type)
s = tok.data.decode('unicode_escape')
self.assertEqual('Antenna', s[:7])
def main():
with open(sys.argv[1]) as file:
code = file.read()
parser = Parser(TokenStream(InputStream(code)))
ast = parser()
ast = to_cps(ast, lambda ast: CallAst(VarAst('β_TOPLEVEL'), [ast]))
# print(ast)
ast = Optimizer().optimize(ast)
# print(ast)
js_code = to_js(ast)
print(js_code)
def test_literal(self):
"""Test literal strings."""
filepath = os.path.join(TokenStreamTest.path, 'literal.dat')
with open(filepath, 'rb') as f:
tk = TokenStream(filepath, f)
tok = tk.next_token()
self.assertEqual(EToken.LITERAL_STRING, tok.type)
b = tok.data
self.assertEqual(17, len(b))
self.assertEqual('This', b[1:5])
def test_peek_and_next(self):
token_stream = TokenStream(
InputStream(' # comment\n123 abc let a=2 >=;'))
self.assertEqual(token_stream.peek(), Token('num', 123.0))
self.assertEqual(token_stream.peek(), Token('num', 123.0))
self.assertEqual(token_stream.next(), Token('num', 123.0))
token_stream = TokenStream(
InputStream(' # comment\n123 abc let a=2 js >=;'))
self.assertEqual(token_stream.next(), Token('num', 123.0))
self.assertEqual(token_stream.next(), Token('var', 'abc'))
self.assertEqual(token_stream.next(), Token('kw', 'let'))
self.assertEqual(token_stream.next(), Token('var', 'a=2'))
self.assertEqual(token_stream.next(), Token('kw', 'js'))
token_stream = TokenStream(InputStream('λ (n) 1'))
self.assertEqual(token_stream.next(), Token("kw", "λ"))
self.assertEqual(token_stream.next(), Token("punc", "("))
self.assertEqual(token_stream.next(), Token("var", "n"))
self.assertEqual(token_stream.next(), Token("punc", ")"))
self.assertEqual(token_stream.next(), Token("num", 1.0))
def test_literal02(self):
"""Test escape sequences in literal strings."""
filepath = 't/literal02.dat'
with open(filepath, 'rb') as f:
tk = TokenStream(filepath, f)
# This is a string
tok = tk.next_token()
self.assertEqual(EToken.LITERAL_STRING, tok.type)
b = tok.data
self.assertEqual(2, len(b))
self.assertEqual(40, b[0])
self.assertEqual(41, b[1])
def test_to_cps(self):
js_raw_ast = JsAst("aa")
cps_ast = _cps_js_raw(js_raw_ast, lambda x: x)
self.assertEqual(cps_ast, js_raw_ast)
atom_ast = LiteralAst(1.0)
cps_ast = to_cps(atom_ast, lambda x: x)
self.assertEqual(atom_ast, cps_ast)
let_ast = LetAst([], LiteralAst(False))
cps_ast = to_cps(let_ast, lambda x: x)
self.assertEqual(cps_ast, LiteralAst(False))
prog_ast = ProgAst([])
cps_ast = to_cps(prog_ast, lambda x: x)
self.assertEqual(cps_ast, LiteralAst(False))
prog_ast = ProgAst([LiteralAst(1)])
cps_ast = to_cps(prog_ast, lambda x: x)
self.assertEqual(cps_ast, LiteralAst(1))
prog_ast = ProgAst([LiteralAst(1), LiteralAst(2)])
cps_ast = to_cps(prog_ast, lambda x: x)
self.assertEqual(cps_ast, ProgAst([LiteralAst(1), LiteralAst(2)]))
if_ast = IfAst(LiteralAst(1), LiteralAst(2), LiteralAst(3))
cps_ast: CallAst = to_cps(if_ast, lambda x: x)
expected_ast = CallAst(
LambdaAst(
'', cps_ast.func.params,
IfAst(LiteralAst(1),
CallAst(VarAst(cps_ast.func.params[0]), [LiteralAst(2)]),
CallAst(VarAst(cps_ast.func.params[0]),
[LiteralAst(3)]))), [
LambdaAst('', cps_ast.args[0].params,
VarAst(cps_ast.args[0].params[0]))
])
self.assertEqual(cps_ast, expected_ast)
lambda_ast = LambdaAst('', ['x', 'y'], LiteralAst(1))
cps_ast = to_cps(lambda_ast, lambda x: x)
expected_ast = LambdaAst(
'', [cps_ast.params[0]] + ['x', 'y'],
CallAst(VarAst(cps_ast.params[0]), [LiteralAst(1)]))
self.assertEqual(cps_ast, expected_ast)
binary_ast = BinaryAst('+', LiteralAst(1), LiteralAst(2))
cps_ast = to_cps(binary_ast, lambda x: x)
self.assertEqual(cps_ast, binary_ast)
parse = Parser(TokenStream(InputStream("a = foo(10);")))
cps_ast = to_cps(parse(), lambda x: x)
expected_ast = CallAst(VarAst('foo'), [
LambdaAst(
'', [cps_ast.args[0].params[0]],
AssignAst(VarAst('a'), VarAst(cps_ast.args[0].params[0]))),
LiteralAst(10)
])
self.assertEqual(cps_ast, expected_ast)
def main():
# code = "sum = lambda(x, y) x + y; print(sum(2, 3));"
code = """
fib = λ(n) if n < 2 then n else fib(n - 1) + fib(n - 2);
time( λ() println(fib(12)) );
"""
# code = "print(1 + 2 * 3)"
# code = """
# fib = λ(n) if n < 2 then n else fib(n - 1) + fib(n - 2);
# println(fib(8));
# """
parser = Parser(TokenStream(InputStream(code)))
global_env = Environment()
for name, func in primitive.items():
global_env.define(name, func)
evaluate(parser(), global_env, lambda result: result)
def test_literal03(self):
"""Test escape sequences in literal strings."""
filepath = 't/literal03.dat'
with open(filepath, 'rb') as f:
tk = TokenStream(filepath, f)
# This is a string
tok = tk.next_token()
self.assertEqual(EToken.LITERAL_STRING, tok.type)
b = tok.data
for i in b:
print(f'i="{i}"')
self.assertEqual(9, len(b))
self.assertEqual(13, b[0]) # \r CR
self.assertEqual(10, b[1]) # \n LF
print(f'b[2]="{b[2]}"')
self.assertEqual(8, b[2]) # \b BS
self.assertEqual(9, b[3]) # \t TAB
self.assertEqual(12, b[4])
self.assertEqual(40, b[5])
self.assertEqual(41, b[6])
self.assertEqual(0x5c, b[7])
self.assertEqual(83, b[8])
def parse_tokens(filepath):
# Array for token storage
tokens = []
# Parse a character stream into a token stream
with open(filepath, 'rb') as f:
tk = TokenStream(filepath, f)
# tk.cc = tk.bf.next_byte()
indent = 0
while True:
t = tk.next_token()
if t.type == EToken.EOF:
break
if t.type in [
EToken.ARRAY_END, EToken.DICT_END, EToken.OBJECT_END
]:
indent -= 1
t.print_indented(indent)
if t.type in [
EToken.ARRAY_BEGIN, EToken.DICT_BEGIN, EToken.OBJECT_BEGIN
]:
indent += 1
tokens.append(t)
def test01(self):
"""Test simple next_token() and peek_token() calls."""
filepath = os.path.join(TokenStreamTest.path, 'token_stream.dat')
with open(filepath, 'rb') as f:
tk = TokenStream(filepath, f)
# Retrieve a few tokens
tok = tk.next_token()
self.assertEqual(EToken.DICT_BEGIN, tok.type)
tok = tk.next_token()
self.assertEqual(EToken.NAME, tok.type)
self.assertEqual(b'Contents', tok.data)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(6624, tok.data)
# Now peek once
tok2 = tk.peek_token()
self.assertEqual(EToken.INTEGER, tok2.type)
self.assertEqual(0, tok2.data)
# Retrieve a peeked token
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(0, tok.data)
# Peek 3 tokens ahead
tok2 = tk.peek_token()
self.assertEqual(EToken.OBJ_REF, tok2.type)
tok2 = tk.peek_token()
self.assertEqual(EToken.NAME, tok2.type)
self.assertEqual(b'CropBox', tok2.data)
tok2 = tk.peek_token()
self.assertEqual(EToken.ARRAY_BEGIN, tok2.type)
# Retrieve 2 tokens
tok = tk.next_token()
self.assertEqual(EToken.OBJ_REF, tok.type)
tok = tk.next_token()
self.assertEqual(EToken.NAME, tok.type)
self.assertEqual(b'CropBox', tok.data)
# I still have the ARRAY_BEGIN in 'peeked'
# I'm not sure this is the right spec...
# Peeking 5 more
tok2 = tk.peek_token()
self.assertEqual(EToken.INTEGER, tok2.type)
self.assertEqual(0, tok2.data)
tok2 = tk.peek_token()
self.assertEqual(EToken.INTEGER, tok2.type)
self.assertEqual(0, tok2.data)
tok2 = tk.peek_token()
self.assertEqual(EToken.REAL, tok2.type)
self.assertEqual(595.276, tok2.data)
tok2 = tk.peek_token()
self.assertEqual(EToken.REAL, tok2.type)
self.assertEqual(841.89, tok2.data)
tok2 = tk.peek_token()
self.assertEqual(EToken.ARRAY_END, tok2.type)
# Retrieve 1 plus 5 plus 1
tok = tk.next_token()
self.assertEqual(EToken.ARRAY_BEGIN, tok.type)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(0, tok.data)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(0, tok.data)
tok = tk.next_token()
self.assertEqual(EToken.REAL, tok.type)
self.assertEqual(595.276, tok.data)
tok = tk.next_token()
self.assertEqual(EToken.REAL, tok.type)
self.assertEqual(841.89, tok.data)
tok = tk.next_token()
self.assertEqual(EToken.ARRAY_END, tok.type)
tok = tk.next_token()
self.assertEqual(EToken.NAME, tok.type)
self.assertEqual(b'MediaBox', tok.data)
def test05(self):
"""Test token seek and tell."""
filepath = os.path.join(TokenStreamTest.path, 'obj_stream3.dat')
with open(filepath, 'rb') as f:
tk = TokenStream(filepath, f)
# Memorize position at the beginning, this bugs
xpos = tk.tell()
# tk.seek(0)
# print(f'test05: seek(0): cc="{chr(tk.cc)}", bf.s_pos={tk.bf.s_pos}')
# tk.seek(1)
# print(f'test05: seek(1), cc="{chr(tk.cc)}", bf.s_pos={tk.bf.s_pos}')
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(98, tok.data)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(73, tok.data)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(5, tok.data)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(19, tok.data)
pos2 = tk.tell()
# Go back
tk.seek(xpos)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(98, tok.data)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(73, tok.data)
# Move forward
tk.seek(pos2)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(18, tok.data)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(33, tok.data)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(45, tok.data)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(66, tok.data)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(13, tok.data)
tok = tk.next_token()
self.assertEqual(EToken.INTEGER, tok.type)
self.assertEqual(2, tok.data)
tok = tk.next_token()
self.assertEqual(EToken.OBJ_REF, tok.type)
def test_eof(self):
token_stream = TokenStream(InputStream(' # comment\n'))
self.assertTrue(token_stream.eof())
def test02(self):
"""Test simple next_token() calls."""
filepath = r't\token.dat'
with open(filepath, 'rb') as f:
tk = TokenStream(filepath, f)
# [[[
tok = tk.next_token()
self.assertEqual(EToken.ARRAY_BEGIN, tok.type)
tok = tk.next_token()
self.assertEqual(EToken.ARRAY_BEGIN, tok.type)
tok = tk.next_token()
self.assertEqual(EToken.ARRAY_BEGIN, tok.type)
# <<>> >>
tok = tk.next_token()
self.assertEqual(EToken.DICT_BEGIN, tok.type)
tok = tk.next_token()
self.assertEqual(EToken.DICT_END, tok.type)
tok = tk.next_token()
self.assertEqual(EToken.DICT_END, tok.type)
# ]
tok = tk.next_token()
self.assertEqual(EToken.ARRAY_END, tok.type)
# ///
tok = tk.next_token()
self.assertEqual(EToken.NAME, tok.type)
self.assertEqual(b'', tok.data)
tok = tk.next_token()
self.assertEqual(EToken.NAME, tok.type)
self.assertEqual(b'', tok.data)
tok = tk.next_token()
self.assertEqual(EToken.NAME, tok.type)
self.assertEqual(b'', tok.data)
for i in range(6):
tok = tk.next_token()
# >>\r\n<<
tok = tk.next_token()
self.assertEqual(EToken.DICT_END, tok.type)
tok = tk.next_token()
self.assertEqual(EToken.CRLF, tok.type)
tok = tk.next_token()
self.assertEqual(EToken.DICT_BEGIN, tok.type)
# /a
tok = tk.next_token()
self.assertEqual(EToken.NAME, tok.type)
self.assertEqual(b'a', tok.data)
# /b
tok = tk.next_token()
self.assertEqual(EToken.NAME, tok.type)
self.assertEqual(b'b', tok.data)
# /c
tok = tk.next_token()
self.assertEqual(EToken.NAME, tok.type)
self.assertEqual(b'c', tok.data)
# /d
tok = tk.next_token()
self.assertEqual(EToken.NAME, tok.type)
self.assertEqual(b'd', tok.data)
tok = tk.next_token()
self.assertEqual(EToken.DICT_END, tok.type)
def __init__(self, filepath, f):
self.tk = TokenStream(filepath, f)
self.f = f
self.tok = self.tk.next_token()
def test_evaluate(self):
ast = LiteralAst(1.0)
environment = Environment()
evaluate(ast, environment, lambda value: self.assertEqual(value, 1.0))
ast = LiteralAst(True)
environment = Environment()
evaluate(ast, environment, self.assertTrue)
ast = LiteralAst(False)
environment = Environment()
evaluate(ast, environment, self.assertFalse)
ast = LiteralAst("aaa")
evaluate(ast, Environment(),
lambda value: self.assertEqual(value, "aaa"))
ast = BinaryAst('+', LiteralAst(1), LiteralAst(2))
evaluate(ast, Environment(),
lambda value: self.assertEqual(value, 3.0))
ast = ProgAst([])
evaluate(ast, Environment(), self.assertFalse)
ast = ProgAst([LiteralAst(1)])
evaluate(ast, Environment(),
lambda value: self.assertEqual(value, 1.0))
ast = ProgAst([LiteralAst(1), LiteralAst(2)])
evaluate(ast, Environment(),
lambda value: self.assertEqual(value, 2.0))
ast = AssignAst(LiteralAst(1), LiteralAst("a"))
with self.assertRaises(Exception):
evaluate(ast, Environment(), lambda value: value)
ast = ProgAst([AssignAst(VarAst('a'), LiteralAst("foo")), VarAst('a')])
evaluate(ast, Environment(),
lambda value: self.assertEqual(value, "foo"))
ast = AssignAst(VarAst("a"), LiteralAst("foo"))
with self.assertRaises(Exception):
evaluate(ast, Environment(Environment()), lambda value: value)
ast = CallAst(
LambdaAst("", ["a"], VarAst("a")),
[LiteralAst(1)],
)
evaluate(ast, Environment(),
lambda value: self.assertEqual(value, 1.0))
ast = CallAst(LambdaAst("", ["a"], VarAst("a")), [LiteralAst("abc")])
evaluate(ast, Environment(),
lambda value: self.assertEqual(value, "abc"))
# # (λ loop (n) if n > 0 then n + loop(n - 1) else 0) (10)
ast = CallAst(
LambdaAst(
"loop", ["n"],
IfAst(
BinaryAst(">", VarAst("n"), LiteralAst(0)),
BinaryAst(
"+", VarAst("n"),
CallAst(VarAst("loop"),
[BinaryAst('-', VarAst('n'), LiteralAst(1))])),
LiteralAst(0))), [LiteralAst(10)])
evaluate(ast, Environment(),
lambda value: self.assertEqual(value, 55.0))
# # let (x) x;
ast = LetAst([VarDefAst("x", None)], VarAst("x"))
evaluate(ast, Environment(), self.assertFalse)
# # let (x = 2, y = x + 1, z = x + y) x + y + z
ast = LetAst([
VarDefAst("x", LiteralAst(2)),
VarDefAst("y", BinaryAst("+", VarAst("x"), LiteralAst(1))),
VarDefAst("z", BinaryAst("+", VarAst("x"), VarAst("y")))
], BinaryAst("+", BinaryAst("+", VarAst("x"), VarAst("y")),
VarAst("z")))
evaluate(ast, Environment(),
lambda value: self.assertEqual(value, 10.0))
# # the second expression will result an errors,
# since x, y, z are bound to the let body
# # let (x = 2, y = x + 1, z = x + y) x + y + z; x + y + z
ast = ProgAst([
LetAst([
VarDefAst('x', LiteralAst(2)),
VarDefAst('y', BinaryAst('+', VarAst('x'), LiteralAst(1))),
VarDefAst('z', BinaryAst('+', VarAst('x'), VarAst('y')))
],
BinaryAst('+', BinaryAst('+', VarAst('x'), VarAst('y')),
VarAst('z'))),
BinaryAst('+', BinaryAst('+', VarAst('x'), VarAst('y')),
VarAst('z'))
])
with self.assertRaises(Exception):
evaluate(ast, Environment(), lambda value: value)
ast = IfAst(LiteralAst(""), LiteralAst(1), None)
evaluate(ast, Environment(),
lambda value: self.assertEqual(value, 1.0))
ast = IfAst(LiteralAst(False), LiteralAst(1), LiteralAst(2))
evaluate(ast, Environment(),
lambda value: self.assertEqual(value, 2.0))
ast = IfAst(LiteralAst(False), LiteralAst(1), LiteralAst(False))
evaluate(ast, Environment(), self.assertFalse)
ast = {"type": "foo", "value": 'foo'}
with self.assertRaises(Exception):
evaluate(ast, Environment(), lambda value: value)
# fib = λ(n) if n < 2 then n else fib(n - 1) + fib(n - 2);
# fib(6);
#
ast = ProgAst([
AssignAst(
VarAst('fib'),
LambdaAst(
'n', ['n'],
IfAst(
BinaryAst('<', VarAst('n'), LiteralAst(2)),
VarAst('n'),
BinaryAst(
'+',
CallAst(
VarAst('fib'),
[BinaryAst('-', VarAst('n'), LiteralAst(1))]),
CallAst(
VarAst('fib'),
[BinaryAst('-', VarAst('n'), LiteralAst(2))
]))))),
CallAst(VarAst('fib'), [LiteralAst(6)])
])
evaluate(ast, Environment(),
lambda value: self.assertEqual(value, 8.0))
ast = IfAst(LiteralAst(False), LiteralAst(1), LiteralAst(False))
evaluate(ast, Environment(), self.assertFalse)
ast = CallAst(LiteralAst(1), [])
with self.assertRaises(Exception):
evaluate(ast, Environment(), self.assertFalse)
code = """
2 + twice(3, 4)
"""
global_env = Environment()
for name, func in primitive.items():
global_env.define(name, func)
parser = Parser(TokenStream(InputStream(code)))
evaluate(parser(), global_env, lambda result: result)
def test_skip_comment(self):
token_stream = TokenStream(InputStream('# abc\ndef'))
token_stream._skip_comment()
self.assertEqual(token_stream._input_stream.peek(), 'd')
def test_croak(self):
token_stream = TokenStream(InputStream(' # comment\n'))
with self.assertRaises(Exception):
token_stream.croak('foo')
def test_literal01(self):
"""Test the set of example strings from the spec."""
filepath = 't/literal01.dat'
with open(filepath, 'rb') as f:
tk = TokenStream(filepath, f)
# This is a string
tok = tk.next_token()
self.assertEqual(EToken.LITERAL_STRING, tok.type)
b = tok.data
self.assertEqual(16, len(b))
self.assertEqual(b'This', b[0:4])
# Skip over end of lines
while True:
tok = tk.next_token()
if tok.type not in [EToken.CR, EToken.LF, EToken.CRLF]:
break
# Strings may contain newlines\n and such
self.assertEqual(EToken.LITERAL_STRING, tok.type)
b = tok.data
self.assertTrue(b.startswith(b'Strings may'))
self.assertTrue(b.endswith(b'such.'))
# Skip over end of lines
while True:
tok = tk.next_token()
if tok.type not in [EToken.CR, EToken.LF, EToken.CRLF]:
break
# Strings may contain balanced parentheses...
self.assertEqual(EToken.LITERAL_STRING, tok.type)
b = tok.data
self.assertEqual(b'(x)', b[41:44])
self.assertTrue(b.endswith(b'% and so on).'))
# Skip over end of lines
while True:
tok = tk.next_token()
if tok.type not in [EToken.CR, EToken.LF, EToken.CRLF]:
break
# The following is an empty string.
self.assertEqual(EToken.LITERAL_STRING, tok.type)
b = tok.data
self.assertEqual(b'The following is an empty string.', b)
while True:
tok = tk.next_token()
if tok.type not in [EToken.CR, EToken.LF, EToken.CRLF]:
break
# Empty string
self.assertEqual(EToken.LITERAL_STRING, tok.type)
b = tok.data
self.assertEqual(0, len(b))
self.assertEqual(b'', b)
# Skip over end of lines
while True:
tok = tk.next_token()
if tok.type not in [EToken.CR, EToken.LF, EToken.CRLF]:
break
# It has zero (0) length.
self.assertEqual(EToken.LITERAL_STRING, tok.type)
b = tok.data
self.assertEqual(23, len(b))
self.assertEqual(b'It has zero (0) length.', b)
if token.type != 'op':
return left
his_prec = self.PRECEDENCE[token.value]
if his_prec > my_prec:
self._token_stream.next()
right = self._maybe_binary(self._parse_atom(), his_prec)
if token.value == '=':
binary = AssignAst(left, right)
else:
binary = BinaryAst(token.value, left, right)
return self._maybe_binary(binary, my_prec)
return left
def __call__(self) -> ProgAst:
return self._parse_toplevel()
def unexpected(self):
"""
raise exception with error msg and error location
whenever encountered error.
"""
self._token_stream.croak(
f'Unexpected token: {self._token_stream.peek()}')
if __name__ == '__main__':
with open(sys.argv[1]) as f:
code = f.read()
ast = Parser(TokenStream(InputStream(code)))()
print(ast)
def test_read_while(self):
token_stream = TokenStream(InputStream('ab123='))
result = token_stream._read_while(lambda ch: ch.isalnum())
self.assertEqual(result, 'ab123')
