我想不僅將 NodeTransformer 應(yīng)用于當(dāng)前文件的 AST，而且還應(yīng)用于導(dǎo)入的任何代碼。如果運(yùn)行下面的代碼，您會(huì)注意到轉(zhuǎn)換器可以工作，但僅適用于讀取和解析的單個(gè)文件。我將如何修改此代碼以將轉(zhuǎn)換器應(yīng)用于解析代碼中的任何導(dǎo)入？a.py:from b import qdef r(a): return q(a) + 5b.py:def q(n): return r(n + 1)def r(n): return nMain.py:import astimport astorclass trivial_transformer(ast.NodeTransformer): def visit_FunctionDef(self, node): body = [] for line in node.body: body.append( ast.Expr( ast.Call(func=ast.Name('print', ctx=ast.Load()), args=[ast.Str(s="Doing: "+astor.to_source(line).strip())], keywords=[]))) body.append(self.generic_visit(line)) node.body = body return nodeparsed_ast = ast.fix_missing_locations(trivial_transformer().visit(ast.parse(open('a.py','r').read())))g = {}eval(compile(parsed_ast, '<source>', 'exec'), g)print(g['r'](5))這產(chǎn)生：Doing: return q(a) + 511但我希望它能產(chǎn)生：Doing: return q(a) + 5Doing: return r(n + 1)Doing: return n11
1 回答
catspeake
TA貢獻(xiàn)1111條經(jīng)驗(yàn) 獲得超0個(gè)贊
好吧，雖然花了一些功夫，但我明白了（woo）：
import ast
import astor
import importlib
import sys
class trivial_transformer(ast.NodeTransformer):
def processImport(self, imp):
if imp not in sys.modules:
spec = importlib.util.find_spec(imp)
helper = importlib.util.module_from_spec(spec)
parsed_dep = ast.fix_missing_locations(self.visit(ast.parse(spec.loader.get_source(imp))))
exec(compile(parsed_dep, imp, 'exec'), helper.__dict__)
sys.modules[imp] = helper
def visit_ImportFrom(self, node):
self.processImport(node.module)
return node
def visit_Import(self, node):
for i in node.names:
self.processImport(i.name)
return node
def visit_FunctionDef(self, node):
body = []
for line in node.body:
body.append(
ast.Expr(
ast.Call(func=ast.Name('print', ctx=ast.Load()),
args=[ast.Str(s="Doing: "+astor.to_source(line).strip())],
keywords=[])))
body.append(self.generic_visit(line))
node.body = body
return node
init = 'a'
trivial_transformer().processImport(init)
import a
a.r(5)
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