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How to use visit_listcomp method in Kiwi

Best Python code snippet using Kiwi_python

nast.py

Source:nast.py

1from ast import Attribute, Subscript, Load2from .compat import PY23from .scope import FuncScope, Flow, SourceScope, ClassScope4from .name import AssignedName, ImportedName5from .util import (np, get_expr_end, get_indexes_for_target, visitor, get_any_marked_name)6if PY2:7    UNSUPPORTED_ASSIGMENTS = Subscript8else:9    from ast import Starred10    UNSUPPORTED_ASSIGMENTS = Subscript, Starred11def extract_scope(source, project):12    scope = SourceScope(source)13    extract(source.tree, scope.flow)14    scope.resolve_star_imports(project)15    return scope16def marked_flow(scope):17    name = get_any_marked_name(scope.source.tree)18    if name and hasattr(name, 'flow'):19        marked_id = name._orig.id20        for n in name.flow._names:21            if n.name == marked_id:22                n.name = name.id23                if marked_id in name.flow.scope.locals:24                    name.flow.scope.locals.remove(marked_id)25                    name.flow.scope.locals.add(name.id)26        return name.flow27@visitor28class extract(object):29    def process(self, tree, flow):30        self.top = flow.scope.top31        self.flow = flow32        self.generic_visit(tree)33        return flow34    def make_flow(self, hint, parents):35        return self.top.add_flow(Flow(hint, self.flow.scope, parents))36    def visit_in_flow(self, nodes, flow):37        cur = self.flow38        self.flow = flow39        if nodes:40            if type(nodes) == list:41                for n in nodes:42                    self.visit(n)43            else:44                self.visit(nodes)45        result = self.flow46        self.flow = cur47        return result48    def visit_Assign(self, node):49        eend = get_expr_end(node.value)50        for targets in node.targets:51            for name, _ in get_indexes_for_target(targets, [], []):52                if isinstance(name, Attribute):53                    self.top.add_attr_assign(self.flow.scope, name, node.value)54                elif isinstance(name, UNSUPPORTED_ASSIGMENTS):55                    continue56                else:57                    name.flow = self.flow58                    self.flow.add_name(AssignedName(name.id, eend, np(name), node.value))59        self.generic_visit(node)60    def visit_If(self, node):61        self.visit(node.test)62        cur = self.flow63        body = self.visit_in_flow(node.body, self.make_flow('if', [cur]))64        orelse = self.visit_in_flow(node.orelse, self.make_flow('else', [cur]))65        self.flow = self.make_flow('join', [body, orelse])66        self.flow.scope.flow = self.flow67    def visit_For(self, node):68        self.visit(node.iter)69        cur = self.flow70        body_start = self.make_flow('for', [cur])71        for nn, _idx in get_indexes_for_target(node.target, [], []):72            body_start.add_name(AssignedName(nn.id, np(node.body[0]), np(nn), node.iter))73        body = self.visit_in_flow(node.body, body_start)74        body_start.loop(body)75        orelse = self.visit_in_flow(node.orelse, self.make_flow('for-else', [cur, body]))76        self.flow = self.make_flow('join', [orelse])77        self.flow.scope.flow = self.flow78    visit_AsyncFor = visit_For79    def visit_While(self, node):80        self.visit(node.test)81        cur = self.flow82        body_start = self.make_flow('while', [cur])83        body = self.visit_in_flow(node.body, body_start)84        body_start.loop(body)85        orelse = self.visit_in_flow(node.orelse,86                                    self.make_flow('while-else', [cur, body]))87        self.flow = self.make_flow('join', [orelse])88        self.flow.scope.flow = self.flow89    def visit_Import(self, node):90        loc = get_expr_end(node)91        start = np(node)92        for a in node.names:93            qualified = False94            if a.asname:95                name = a.asname96                iname = a.name97            else:98                name, sep, _ = a.name.partition('.')99                qualified = bool(sep)100                iname = name101                self.top._imports.append(a.name)102            declared_at = self.top.find_id_loc(name, start)103            self.flow.add_name(ImportedName(name, loc, declared_at, iname, None,104                                            qualified=qualified))105    def visit_ImportFrom(self, node):106        loc = get_expr_end(node)107        start = np(node)108        for a in node.names:109            name = a.asname or a.name110            declared_at = self.top.find_id_loc(name, start)111            module = '.' * node.level + (node.module or '')112            if name == '*':113                self.top._star_imports.append((loc, declared_at, module, self.flow))114            else:115                self.flow.add_name(ImportedName(name, loc, declared_at, module, a.name))116    def visit_TryExcept(self, node):117        cur = self.flow118        body = self.visit_in_flow(node.body, self.make_flow('try', [cur]))119        handlers = []120        for h in node.handlers:121            fh = self.make_flow('except', [cur, body])122            if h.name:123                if PY2:124                    fh.add_name(AssignedName(h.name.id, np(h.body[0]), np(h), h.type))125                else:126                    fh.add_name(AssignedName(h.name, np(h.body[0]), np(h), h.type))127            if h.type:128                self.visit(h.type)129            handlers.append(self.visit_in_flow(h.body, fh))130        orelse = self.visit_in_flow(node.orelse,131                                    self.make_flow('try-else', [body]))132        self.flow = self.make_flow('join', [orelse] + handlers)133        self.flow.scope.flow = self.flow134        if hasattr(node, 'finalbody'):135            self.visit_in_flow(node.finalbody, self.flow)136    visit_Try = visit_TryExcept137    def visit_FunctionDef(self, node):138        for d in node.decorator_list:139            self.visit(d)140        for a in node.args.defaults:141            self.visit(a)142        if not PY2:143            for a in node.args.args:144                a.annotation and self.visit(a.annotation)145            for a in node.args.kwonlyargs:146                a.annotation and self.visit(a.annotation)147            node.returns and self.visit(node.returns)148        cur = self.flow149        scope = FuncScope(cur.scope, node, top=self.top)150        cur.add_name(scope)151        self.visit_in_flow(node.body, scope.flow)152        self.flow = cur153    visit_AsyncFunctionDef = visit_FunctionDef154    def visit_Lambda(self, node):155        for a in node.args.defaults:156            self.visit(a)157        if not PY2:158            for a in node.args.args:159                a.annotation and self.visit(a.annotation)160            for a in node.args.kwonlyargs:161                a.annotation and self.visit(a.annotation)162        cur = self.flow163        scope = FuncScope(cur.scope, node, True, top=self.top)164        self.visit_in_flow(node.body, scope.flow)165    def visit_ClassDef(self, node):166        cur = self.flow167        self.visit_in_flow(node.decorator_list, cur)168        self.visit_in_flow(node.bases, cur)169        scope = ClassScope(cur.scope, node, top=self.top)170        cur.add_name(scope)171        self.visit_in_flow(node.body, scope.flow)172        self.flow = cur173    def visit_Return(self, node):174        self.flow.scope.returns.append(node.value)175        self.generic_visit(node)176    def visit_ListComp(self, node):177        p = cur = self.flow178        for g in node.generators:179            self.visit_in_flow(g.iter, p)180            pp = p181            p = self.make_flow('comp', [p])182            for nn, _idx in get_indexes_for_target(g.target, [], []):183                nn.flow = pp184                p.add_name(AssignedName(nn.id, np(node), np(nn), g.iter))185            if g.ifs:186                for inode in g.ifs:187                    self.visit_in_flow(inode, p)188        elt = getattr(node, 'elt', None) or node.value189        self.visit_in_flow(elt, p)190        if hasattr(node, 'key'):191            self.visit_in_flow(node.key, p)192        self.flow = self.make_flow('comp-join', [cur, p])193        self.flow.scope.flow = self.flow194    visit_GeneratorExp = visit_ListComp195    visit_DictComp = visit_ListComp196    visit_SetComp = visit_ListComp197    def visit_With(self, node):198        if PY2:199            items = [node]200        else:201            items = node.items202        for it in items:203            if it.optional_vars:204                for nn, _idx in get_indexes_for_target(it.optional_vars, [], []):205                    self.flow.add_name(AssignedName(nn.id, np(node.body[0]), np(nn), node))206        self.generic_visit(node)207    visit_AsyncWith = visit_With208    def visit_Global(self, node):209        self.flow.scope.globals.update(node.names)210    def visit_Name(self, node):211        if type(node.ctx) is Load:...

astglobals.py

Source:astglobals.py

1import ast2import collections3import unittest4import warnings5from contextlib import contextmanager6from cached_property import cached_property7__all__ = ['find_globals', 'FindFreeVariablesClassWarning']8class FindFreeVariablesClassWarning(UserWarning):9    pass10class FindFreeVariables(ast.NodeVisitor):11    ''' use the `find_globals` utility function '''12    @cached_property13    def ffv_scope(self):14        return collections.ChainMap()15    @cached_property16    def ffv_globals(self):17        return set()18    # possible scopes: local, global, force_global19    @property20    def ffv_new_scope(self):21        scope = self.ffv_scope22        @contextmanager23        def context():24            scope.maps.insert(0, dict())25            yield26            fglobals = self.ffv_globals27            for name, var_scope in scope.maps[0].items():28                if var_scope != 'local':29                    fglobals.add(name)30            del scope.maps[0]31        return context32    def ffv_binding(self, name, state='local'):33        d = self.ffv_scope34        cur = d.get(name, 'global')35        if cur != 'force_global':36            if not (cur == 'local' and state == 'global'):37                d[name] = state38    def visit_ListComp(self, node):39        with self.ffv_new_scope():40            super().generic_visit(node)41    def visit_SetComp(self, node):42        self.visit_ListComp(node)43    def visit_DictComp(self, node):44        self.visit_ListComp(node)45    def visit_GeneratorExp(self, node):46        self.visit_ListComp(node)47    def visit_Name(self, node):48        if isinstance(node.ctx, ast.Store): # establish new binding49            self.ffv_binding(node.id)50        elif isinstance(node.ctx, ast.Load):51            self.ffv_binding(node.id, state='global')52        super().generic_visit(node)53    def visit_FunctionDef(self, node):54        with self.ffv_new_scope():55            args = node.args56            for a in args.args:57                self.ffv_binding(a.arg)58            for a in args.kwonlyargs:59                self.ffv_binding(a.arg)60            if args.vararg:61                self.ffv_binding(args.vararg.arg)62            if args.kwarg:63                self.ffv_binding(args.kwarg.arg)64            super().generic_visit(node)65        name = getattr(node, 'name', None)66        if name: self.ffv_binding(node.name)67    def visit_AsyncFunctionDef(self, node):68        self.visit_FunctionDef(node)69    def visit_Lambda(self, node):70        self.visit_FunctionDef(node)71    def visit_ClassDef(self, node):72        warnings.warn(FindFreeVariablesClassWarning(73            "Global variable detection is not fully implemented for Python "74            "classes. This may lead to false dependencies being established "75            "in the caching system."))76        super().generic_visit(node)77    def visit_ExceptHandler(self, node):78        if node.name:79            self.ffv_binding(node.name)80        super().generic_visit(node)81    def visit_Import(self, node):82        for alias in node.names:83            self.ffv_binding(alias.asname)84        super().generic_visit(node)85    def visit_ImportFrom(self, node):86        self.visit_Import(node)87    def visit_Global(self, node):88        for name in node.names:89            self.ffv_binding(name, 'force_global')90        super().generic_visit(node)91    def visit_With(self, node):92        super().generic_visit(node)93def find_globals(ast_tree):94    '''95Returns a set of all global variable names referenced in the code.96Warning: does not yet work properly on classes.'''97    ffv = FindFreeVariables()98    ffv.visit(ast_tree)99    return ffv.ffv_globals100class UnitTest(unittest.TestCase):101    def test_me(self):102        codes = [('''\103def f(a, b):104  l1 = a + b105  g1(g2, l1)106''', 'g1 g2'),107                 ('''\108def f(a):109  l1, g1.abc, l2 = a + g2110  if a:111    l3 = g3(l2, name=l1, *l3, **g4)112  g5.A2[l3] = g6.A1[l2]113''', 'g1 g2 g3 g4 g5 g6'),114('''\115def f(a):116  for i in a:117    g1(a, i)118  l1 = g2[g3(i)]119  with g4(l1) as l2:120    g1(l1, l2)121  def h(b, arg=g5):122    g6(l1, l2, i)123  k = lambda b, arg=g7: g8(l1, b)124''', 'g1 g2 g3 g4 g5 g6 g7 g8'),125                 ('''\126def f(a):127  try:128    l1 = g1()129  except g4 as l2:130    l1 = g2(l2)131  finally:132    g3()133''', 'g1 g2 g3 g4'),134                 ('''\135def f(a):136  import abc as l1137  from abc import xyz as l2138  g1(l1, l2)139''', 'g1'),140                 ('''\141def f(a):142  global g1143  g1, l1 = a144''', 'g1'),145                 ('''\146def f(a):147  with g1(a, g2) as l1:148    g2(l1)149  g3(l1, a)150''', 'g1 g2 g3'),151                 ('''\152def f(a):153  g1(l1+g2 for l1 in a+g3)154  g4([l2+g5 for l2 in a+g6])155''', 'g1 g2 g3 g4 g5 g6'),156                 ('''\157def f(a):158  def l1():159    return a160  return l1161''', ''),162                 ('''\163def f1(g1):164  def f2():165    global g1166    def f3():167      g1()168''', 'g1'),169]170        for code, gs in codes:171            c = ast.parse(code)172            self.assertEqual(set(gs.split()), find_globals(c))173    def test_raises_warning(self):174        c = ast.parse('''175def f(a):176  class l1(g1, metaclass=g2):177    l2 = a178    g3 = a # here it's local to the class179    def method(self):180      g3() # here this is actually a global!181''')182        with warnings.catch_warnings(record=True) as w:183            warnings.simplefilter("always")184            find_globals(c)185            self.assertEqual(len(w), 1)186            self.assertTrue(issubclass(...

analysis.py

Source:analysis.py

1class CodeVisitor(TutorialNodeVisitor):2    def __init__(self):3        super().__init__()4        self.uses_comprehension = False5        self.uses_if_comprehension = False6    def visit_ListComp(self, node):7        super().visit_ListComp(node)8        self.uses_comprehension = True9        if node.generators[0].ifs != []:10            self.uses_if_comprehension = True11class Analyser(CodeAnalyser):12    def _analyse(self):13        if not self.visitor.functions['square_odds'].is_defined:14            self.add_error('You need to define square_odds')15        elif len(self.visitor.functions['square_odds'].args) != 1:16            self.add_error('square_odds should accept exactly one arg')17        else:18            if not self.visitor.uses_comprehension:19                self.add_error('You need to use list comprehension')20            if not self.visitor.uses_if_comprehension:21                self.add_error('You need to use if inside list comprehension')...

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