106 lines
4.2 KiB
Python
106 lines
4.2 KiB
Python
import copy
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from core.ast.visitors import UnreferencedNamesVisitor
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from core.builtin_concepts import BuiltinConcepts, ParserResultConcept
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from evaluators.BaseEvaluator import OneReturnValueEvaluator
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from parsers.PythonParser import PythonNode
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import ast
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import core.ast.nodes
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class PythonEvaluator(OneReturnValueEvaluator):
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NAME = "Python"
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"""
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Evaluate a Python node, ie, evaluate some Python code
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"""
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def __init__(self):
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super().__init__(self.NAME, [BuiltinConcepts.EVALUATION], 50)
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def matches(self, context, return_value):
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return return_value.status and \
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isinstance(return_value.value, ParserResultConcept) and \
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isinstance(return_value.value.value, PythonNode)
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def eval(self, context, return_value):
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sheerka = context.sheerka
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node = return_value.value.value
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try:
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context.log(self.verbose_log, f"Evaluating python node {node}.", self.name)
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my_locals = self.get_locals(context, node.ast_)
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context.log(self.verbose_log, f"locals={my_locals}", self.name)
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if isinstance(node.ast_, ast.Expression):
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context.log(self.verbose_log, "Evaluating using 'eval'.", self.name)
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compiled = compile(node.ast_, "<string>", "eval")
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evaluated = eval(compiled, {}, my_locals)
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else:
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context.log(self.verbose_log, "Evaluating using 'exec'.", self.name)
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evaluated = self.exec_with_return(node.ast_, my_locals)
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context.log(self.verbose_log, f"{evaluated=}", self.name)
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return sheerka.ret(self.name, True, evaluated, parents=[return_value])
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except Exception as error:
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context.log_error(self.verbose_log, error, self.name)
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error = sheerka.new(BuiltinConcepts.ERROR, body=error)
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return sheerka.ret(self.name, False, error, parents=[return_value])
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def get_locals(self, context, ast_):
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my_locals = {"sheerka": context.sheerka}
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if context.obj:
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context.log(self.verbose_log,
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f"Concept '{context.obj}' is in context. Adding its properties to locals if any.", self.name)
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for prop_name, prop_value in context.obj.props.items():
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my_locals[prop_name] = prop_value.value
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node_concept = core.ast.nodes.python_to_concept(ast_)
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unreferenced_names_visitor = UnreferencedNamesVisitor(context.sheerka)
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unreferenced_names_visitor.visit(node_concept)
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for name in unreferenced_names_visitor.names:
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context.log(self.verbose_log, f"Resolving '{name}'.", self.name)
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if name in my_locals:
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context.log(self.verbose_log, f"Using value from property.", self.name)
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continue
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concept = context.sheerka.new(name)
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if context.sheerka.isinstance(concept, BuiltinConcepts.UNKNOWN_CONCEPT):
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context.log(self.verbose_log, f"'{name}' is not a concept. Skipping.", self.name)
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continue
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context.log(self.verbose_log, f"'{name}' is a concept. Evaluating.", self.name)
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sub_context = context.push(self.name, desc=f"Evaluating '{concept}'", obj=concept)
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sub_context.log_new(self.verbose_log)
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evaluated = context.sheerka.evaluate_concept(sub_context, concept, self.verbose_log)
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if evaluated.key == concept.key:
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my_locals[name] = evaluated.body or evaluated
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return my_locals
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@staticmethod
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def expr_to_expression(expr):
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expr.lineno = 0
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expr.col_offset = 0
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result = ast.Expression(expr.value, lineno=0, col_offset=0)
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return result
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def exec_with_return(self, code_ast, my_locals):
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init_ast = copy.deepcopy(code_ast)
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init_ast.body = code_ast.body[:-1]
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last_ast = copy.deepcopy(code_ast)
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last_ast.body = code_ast.body[-1:]
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exec(compile(init_ast, "<ast>", "exec"), {}, my_locals)
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if type(last_ast.body[0]) == ast.Expr:
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return eval(compile(self.expr_to_expression(last_ast.body[0]), "<ast>", "eval"), {}, my_locals)
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else:
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exec(compile(last_ast, "<ast>", "exec"), {}, my_locals)
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