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from sys import stderr
KEYWORDS = [
"class",
"constructor",
"function",
"method",
"field",
"static",
"var",
"int",
"char",
"boolean",
"void",
"true",
"false",
"null",
"this",
"let",
"do",
"if",
"else",
"while",
"return",
]
SYMBOLS = "{}()[].,;+-*/&|<>=~"
EXIT_CODE_FILE_ERROR = 1
EXIT_CODE_INVALID_TOKEN = 2
EXIT_CODE_SYNTAX_ERROR = 4
EXIT_CODE_EOF = 7
# vim autoindent misbehaves if I type these verbatim in strings
LEFT_BRACE = "{"
RIGHT_BRACE = "}"
LEFT_BRACKET = "["
RIGHT_BRACKET = "]"
LEFT_PAREN = "("
RIGHT_PAREN = ")"
class JackSyntaxError(Exception):
def __init__(self, msg, token):
self.message = msg
self.token = token
super().__init__(msg)
class UnexpectedToken(JackSyntaxError):
def __init__(self, expected, unexpected):
if str(expected) in KEYWORDS or str(expected) in SYMBOLS:
# wrap literal keyword/symbol in backticks
super().__init__(
f"Expected `{expected}`, got `{unexpected}` instead", unexpected
)
else:
super().__init__(
f"Expected {expected}, got `{unexpected}` instead", unexpected
)
class Unexpected(JackSyntaxError):
def __init__(self, expected, unexpected):
super().__init__(
f"Expected `{expected}`, got `{unexpected}` instead", unexpected
)
def print_err(msg):
print(msg, file=stderr)
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