/
evaluate.py
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/
evaluate.py
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# Based on super lightweight Simple Top-Down Parser from http://effbot.org/zone/simple-top-down-parsing.htm
# and https://bitbucket.org/emacsway/sqlbuilder/src/default/sqlbuilder/smartsql/contrib/evaluate.py
import re
from rope.base.oi.type_hinting import utils
from rope.base import utils as base_utils
class SymbolBase:
name = None # node/token type name
def __init__(self):
self.value = None # used by name and literals
self.first = None
self.second = None
self.third = None # used by tree nodes
def nud(self, parser):
raise SyntaxError("Syntax error (%r)." % self.name)
def led(self, left, parser):
raise SyntaxError("Unknown operator (%r)." % self.name)
def evaluate(self, pyobject):
raise NotImplementedError(self.name, self)
def __repr__(self):
if self.name == "(name)":
return "({} {})".format(self.name[1:-1], self.value)
out = [repr(self.name), self.first, self.second, self.third]
out = [str(i) for i in out if i]
return "(" + " ".join(out) + ")"
class SymbolTable:
def multi(func):
def _inner(self, names, *a, **kw):
for name in names.split():
func(self, name, *a, **kw)
return _inner
def __init__(self):
self.symbol_table = {}
def get(self, name, default=None):
return self.symbol_table.get(name, default)
def __getitem__(self, name):
return self.symbol_table[name]
def __iter__(self):
return iter(self.symbol_table)
def symbol(self, name, bp=0):
try:
s = self.symbol_table[name]
except KeyError:
class S(SymbolBase):
pass
s = S
s.__name__ = "symbol-" + name # for debugging
s.name = name
s.lbp = bp
self.symbol_table[name] = s
else:
s.lbp = max(bp, s.lbp)
return s
@multi
def infix(self, name, bp):
symbol = self.symbol(name, bp)
@method(symbol)
def led(self, left, parser):
self.first = left
self.second = parser.expression(bp)
return self
@multi
def infix_r(self, name, bp):
symbol = self.symbol(name, bp)
@method(symbol)
def led(self, left, parser):
self.first = left
self.second = parser.expression(bp - 0.1)
return self
def ternary(self, name, name2, bp):
symbol = self.symbol(name, bp)
symbol2 = self.symbol(name2)
@method(symbol)
def led(self, left, parser):
self.first = left
self.second = parser.expression(symbol2.lbp)
parser.advance(symbol2.name)
self.third = parser.expression(symbol2.lbp + 0.1)
return self
@multi
def prefix(self, name, bp):
symbol = self.symbol(name, bp)
@method(symbol)
def nud(self, parser):
self.first = parser.expression(bp)
return self
@multi
def postfix(self, name, bp):
symbol = self.symbol(name, bp)
@method(symbol)
def led(self, left, parser):
self.first = left
return self
multi = staticmethod(multi) # Just for code checker
symbol_table = SymbolTable()
class Lexer:
_token_pattern = re.compile(
r"""
\s*
(?:
(
[,()\[\]|]
| ->
| (?<=\s)(?:or)\b
) # operator
| ([a-zA-Z](?:\w|\.)*) # name
)
""",
re.U | re.S | re.X,
)
def __init__(self, symbol_table):
self.symbol_table = symbol_table
def tokenize(self, program):
for name, value in self._tokenize_expr(program):
symbol = symbol_table.get(value)
if symbol:
s = symbol()
elif name == "(name)":
symbol = symbol_table[name]
s = symbol()
s.value = value
else:
raise SyntaxError(
"Unknown operator ({}). Possible operators are {!r}".format(
value, list(self.symbol_table)
)
)
yield s
def _tokenize_expr(self, program):
if isinstance(program, bytes):
program = program.decode("utf-8")
# import pprint; pprint.pprint(self._token_pattern.findall(program))
for operator, name in self._token_pattern.findall(program):
if operator:
yield "(operator)", operator
elif name:
yield "(name)", name
else:
raise SyntaxError
yield "(end)", "(end)"
class Parser:
token = None
next = None
def __init__(self, lexer):
self.lexer = lexer
def parse(self, program):
generator = self.lexer.tokenize(program)
self.next = generator.__next__
self.token = self.next()
return self.expression()
def expression(self, rbp=0):
t = self.token
self.token = self.next()
left = t.nud(self)
while rbp < self.token.lbp:
t = self.token
self.token = self.next()
left = t.led(left, self)
return left
def advance(self, name=None):
if name and self.token.name != name:
raise SyntaxError(f"Expected {name!r} but found {self.token.name!r}")
self.token = self.next()
def method(s):
assert issubclass(s, SymbolBase)
def bind(fn):
setattr(s, fn.__name__, fn)
return fn
return bind
symbol, infix, infix_r, prefix, postfix, ternary = (
symbol_table.symbol,
symbol_table.infix,
symbol_table.infix_r,
symbol_table.prefix,
symbol_table.postfix,
symbol_table.ternary,
)
symbol("(", 270)
symbol(")")
symbol("[", 250) # Parameters
symbol("]")
symbol("->", 230)
infix("|", 170)
infix("or", 170)
symbol(",")
symbol("(name)")
symbol("(end)")
@method(symbol("(name)"))
def nud(self, parser):
return self
@method(symbol("(name)"))
def evaluate(self, pyobject):
return utils.resolve_type(self.value, pyobject)
# Parametrized objects
@method(symbol("["))
def led(self, left, parser):
self.first = left
self.second = []
if parser.token.name != "]":
while 1:
if parser.token.name == "]":
break
self.second.append(parser.expression())
if parser.token.name != ",":
break
parser.advance(",")
parser.advance("]")
return self
@method(symbol("["))
def evaluate(self, pyobject):
return utils.parametrize_type(
self.first.evaluate(pyobject), *[i.evaluate(pyobject) for i in self.second]
)
# Anonymous Function Calls
@method(symbol("("))
def nud(self, parser):
self.second = []
if parser.token.name != ")":
while 1:
self.second.append(parser.expression())
if parser.token.name != ",":
break
parser.advance(",")
parser.advance(")")
parser.advance("->")
self.third = parser.expression(symbol("->").lbp + 0.1)
return self
# Function Calls
@method(symbol("("))
def led(self, left, parser):
self.first = left
self.second = []
if parser.token.name != ")":
while 1:
self.second.append(parser.expression())
if parser.token.name != ",":
break
parser.advance(",")
parser.advance(")")
parser.advance("->")
self.third = parser.expression(symbol("->").lbp + 0.1)
return self
@method(symbol("("))
def evaluate(self, pyobject):
# TODO: Implement me
raise NotImplementedError
@method(symbol("or"))
@method(symbol("|"))
def evaluate(self, pyobject):
# TODO: Implement me
raise NotImplementedError
class Compiler:
parser_factory = Parser
lexer_factory = Lexer
symbol_table = symbol_table
def _make_parser(self):
return self.parser_factory(self.lexer_factory(self.symbol_table))
@base_utils.cached(500)
def __call__(self, program):
"""
:type program: str
:rtype: rope.base.oi.type_hinting.evaluate.SymbolBase
"""
return self._make_parser().parse(program)
compile = Compiler()
class Evaluator:
compile = compile
def __call__(self, program, pyobject):
"""Evaluates the program string or AST
:type program: str or rope.base.oi.type_hinting.evaluate.SymbolBase
:rtype: rope.base.pyobjects.PyDefinedObject | rope.base.pyobjects.PyObject or None
"""
ast = self.compile(program) if isinstance(program, str) else program
return ast.evaluate(pyobject)
evaluate = Evaluator()