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spi2.py
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spi2.py
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INTEGER, PLUS, MINUS, MUL, DIV, LPAREN, RPAREN, ID, ASSIGN, BEGIN, END, SEMI, DOT, EOF = (
'INTEGER', 'PLUS', 'MINUS', 'MUL', 'DIV', '(', ')', "ID", "ASSIGN", "BEGIN",
"END", "SEMI", "DOT", 'EOF'
)
class Token(object):
def __init__(self, type, value):
self.type = type
self.value = value
def __str__(self):
return 'Token ({type}, {value})'.format(
type = self.type,
value = repr(self.value)
)
def __repr__(self):
return self.__str__()
RESERVED_KEYWORDS = {
'BEGIN':Token('BEGIN', 'BEGIN'),
'END': Token('END', 'END'),
}
class Lexer(object):
def __init__(self, text):
self.text = text
self.pos = 0
self.current_char = self.text[self.pos]
def error(self):
raise Exception("INVALID CHAR")
def advance(self):
self.pos += 1
if self.pos > len(self.text) - 1:
self.current_char = None
else:
self.current_char = self.text[self.pos]
def peek(self):
peek_pos = self.pos + 1
if peek_pos > len(self.text) - 1:
return None
else:
return self.text[peek_pos]
def skip_whitespace(self):
while self.current_char is not None and self.current_char.isspace():
self.advance()
def integer(self):
result = ""
while self.current_char is not None and self.current_char.isdigit():
result += self.current_char
self.advance()
return int(result)
def _id(self):
result = ''
while self.current_char is not None and self.current_char.isalnum():
result += self.current_char
self.advance()
token = RESERVED_KEYWORDS.get(result, Token(ID, result))
return token
def get_next_token(self):
while self.current_char is not None:
if self.current_char.isspace():
self.skip_whitespace()
continue
if self.current_char.isalpha():
return self._id()
if self.current_char.isdigit():
return Token(INTEGER, self.integer())
if self.current_char == ':' and self.peek() == '=':
self.advance()
self.advance()
return Token(ASSIGN, ':=')
if self.current_char == ';':
self.advance()
return Token(SEMI, ';')
if self.current_char == '+':
self.advance()
return Token(PLUS, '+')
if self.current_char == '-':
self.advance()
return Token(MINUS, '-')
if self.current_char == '*':
self.advance()
return Token(MUL, '*')
if self.current_char == '/':
self.advance()
return Token(DIV, '/')
if self.current_char == '(':
self.advance()
return Token(LPAREN, '(')
if self.current_char == ')':
self.advance()
return Token(RPAREN, ')')
if self.current_char == '.':
self.advance()
return Token(DOT, '.')
self.error()
return Token(EOF, None)
class AST(object):
pass
class UnaryOp(AST):
def __init__(self, op, expr):
self.token = self.op = op
self.expr = expr
class BinOp(AST):
def __init__(self, left, op, right):
self.left = left
self.token = self.op = op
self.right = right
class Num(AST):
def __init__(self, token):
self.token = token
self.value = token.value
class Compound(AST):
def __init__(self):
self.children = []
class Assign(AST):
def __init__(self, left, op, right):
self.left = left
self.token = self.op = op
self.right = right
class Var(AST):
def __init__(self, token):
self.token = token
self.value = token.value
class NoOp(AST):
pass
class Parser(object):
def __init__(self, lexer):
self.lexer = lexer
self.current_token = self.lexer.get_next_token()
def error(self):
raise Exception("invalid syntax")
def eat(self, token_type):
if self.current_token.type == token_type:
self.current_token = self.lexer.get_next_token()
else:
self.error()
def program(self):
node = self.compound_statement()
self.eat(DOT)
return node
def compound_statement(self):
self.eat(BEGIN)
nodes = self.statement_list()
self.eat(END)
root = Compound()
for node in nodes:
root.children.append(node)
return root
def statement_list(self):
node = self.statement()
results = [node]
while self.current_token.type == SEMI:
self.eat(SEMI)
results.append(self.statement())
if self.current_token.type == ID:
self.error()
return results
def statement(self):
if self.current_token.type == BEGIN:
node = self.compound_statement()
elif self.current_token.type == ID:
node = self.assignment_statement()
else:
node = self.empty()
return node
def assignment_statement(self):
left = self.variable()
token = self.current_token
self.eat(ASSIGN)
right = self.expr()
node = Assign(left, token, right)
return node
def variable(self):
node = Var(self.current_token)
self.eat(ID)
return node
def empty(self):
return NoOp()
def factor(self):
token = self.current_token
if token.type == PLUS:
self.eat(PLUS)
node = UnaryOp(token, self.factor())
return node
elif token.type == MINUS:
self.eat(MINUS)
node = UnaryOp(token, self.factor())
return node
elif token.type == INTEGER:
self.eat(INTEGER)
return Num(token)
elif token.type == LPAREN:
self.eat(LPAREN)
node = self.expr()
self.eat(RPAREN)
return node
else:
node = self.variable()
return node
def term(self):
node = self.factor()
while self.current_token.type in (MUL, DIV):
token = self.current_token
if token.type == MUL:
self.eat(MUL)
elif token.type == DIV:
self.eat(DIV)
node = BinOp(left=node, op=token, right=self.factor())
return node
def expr(self):
node = self.term()
while self.current_token.type in (PLUS, MINUS):
token = self.current_token
if token.type == PLUS:
self.eat(PLUS)
elif token.type == MINUS:
self.eat(MINUS)
node = BinOp(left=node, op=token, right=self.term())
return node
def parse(self):
node = self.program()
if self.current_token.type != EOF:
self.error()
return node
##########################################################################################################
# INTERPRETER
##########################################################################################################
class NodeVisitor(object):
def visit(self, node):
method_name = 'visit_' + type(node).__name__
visitor = getattr(self, method_name, self.generic_visit)
return visitor(node)
def generic_visit(self, node):
raise Exception('No visit_{} method'.format(type(node).__name__))
class Interpreter(NodeVisitor):
GLOBAL_SCOPE = {}
def __init__(self, parser):
self.parser = parser
def visit_UnaryOp(self, node):
op = node.op.type
if op == PLUS:
return +self.visit(node.expr)
elif op == MINUS:
return -self.visit(node.expr)
def visit_BinOp(self, node):
if node.op.type == PLUS:
return self.visit(node.left) + self.visit(node.right)
elif node.op.type == MINUS:
return self.visit(node.left) - self.visit(node.right)
elif node.op.type == MUL:
return self.visit(node.left) * self.visit(node.right)
elif node.op.type == DIV:
return self.visit(node.left) // self.visit(node.right)
def visit_Num(self, node):
return node.value
def visit_UnaryOp(self, node):
op = node.op.type
if op == PLUS:
return +self.visit(node.expr)
elif op == MINUS:
return -self.visit(node.expr)
def visit_Compound(self, node):
for child in node.children:
self.visit(child)
def visit_Assign(self, node):
var_name = node.left.value
self.GLOBAL_SCOPE[var_name] = self.visit(node.right)
def visit_Var(self, node):
var_name = node.value
val = self.GLOBAL_SCOPE.get(var_name)
if val is None:
raise NameError(repr(var_name))
else:
return val
def visit_NoOp(self, node):
pass
def interpret(self):
tree = self.parser.parse()
if tree is None:
return ''
return self.visit(tree)
def main():
import sys
text = open(sys.argv[1], 'r').read()
lexer = Lexer(text)
parser = Parser(lexer)
interpreter = Interpreter(parser)
result = interpreter.interpret()
print(interpreter.GLOBAL_SCOPE)
if __name__ == '__main__':
main()