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ast.py
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952 lines (629 loc) · 19.5 KB
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'''
Abstract syntax tree classes.
This is designed to replace the stdlib ast module.
Unlike the stdlib module, it is version independent.
The classes in this file are based on the corresponding types in the cpython interpreter, copyright PSF.
'''
class AstBase(object):
__slots__ = "lineno", "col_offset", "_end",
def __repr__(self):
args = ",".join(repr(getattr(self, field, None)) for field in self.__slots__)
return "%s(%s)" % (self.__class__.__name__, args)
class Class(AstBase):
'AST node representing a class definition'
__slots__ = "name", "body",
def __init__(self, name, body):
self.name = name
self.body = body
class Function(AstBase):
'AST node representing a function definition'
__slots__ = "is_async", "name", "type_parameters", "args", "vararg", "kwonlyargs", "kwarg", "body",
def __init__(self, name, type_parameters, args, vararg, kwonlyargs, kwarg, body, is_async=False):
self.name = name
self.type_parameters = type_parameters
self.args = args
self.vararg = vararg
self.kwonlyargs = kwonlyargs
self.kwarg = kwarg
self.body = body
self.is_async = is_async
class Module(AstBase):
def __init__(self, body):
self.body = body
class StringPart(AstBase):
'''Implicitly concatenated part of string literal'''
__slots__ = "prefix", "text", "s",
def __init__(self, prefix, text, s):
self.prefix = prefix
self.text = text
self.s = s
class alias(AstBase):
__slots__ = "value", "asname",
def __init__(self, value, asname):
self.value = value
self.asname = asname
class arguments(AstBase):
__slots__ = "defaults", "kw_defaults", "annotations", "varargannotation", "kwargannotation", "kw_annotations",
def __init__(self, defaults, kw_defaults, annotations, varargannotation, kwargannotation, kw_annotations):
if len(defaults) != len(annotations):
raise AssertionError('len(defaults) != len(annotations)')
if len(kw_defaults) != len(kw_annotations):
raise AssertionError('len(kw_defaults) != len(kw_annotations)')
self.kw_defaults = kw_defaults
self.defaults = defaults
self.annotations = annotations
self.varargannotation = varargannotation
self.kwargannotation = kwargannotation
self.kw_annotations = kw_annotations
class boolop(AstBase):
pass
class cmpop(AstBase):
pass
class comprehension(AstBase):
__slots__ = "is_async", "target", "iter", "ifs",
def __init__(self, target, iter, ifs, is_async=False):
self.target = target
self.iter = iter
self.ifs = ifs
self.is_async = is_async
class dict_item(AstBase):
pass
class type_parameter(AstBase):
pass
class expr(AstBase):
__slots__ = "parenthesised",
class expr_context(AstBase):
pass
class operator(AstBase):
pass
class stmt(AstBase):
pass
class unaryop(AstBase):
pass
class pattern(AstBase):
__slots__ = "parenthesised",
class And(boolop):
pass
class Or(boolop):
pass
class Eq(cmpop):
pass
class Gt(cmpop):
pass
class GtE(cmpop):
pass
class In(cmpop):
pass
class Is(cmpop):
pass
class IsNot(cmpop):
pass
class Lt(cmpop):
pass
class LtE(cmpop):
pass
class NotEq(cmpop):
pass
class NotIn(cmpop):
pass
class DictUnpacking(dict_item):
__slots__ = "value",
def __init__(self, value):
self.value = value
class KeyValuePair(dict_item):
__slots__ = "key", "value",
def __init__(self, key, value):
self.key = key
self.value = value
class keyword(dict_item):
__slots__ = "arg", "value",
def __init__(self, arg, value):
self.arg = arg
self.value = value
class AssignExpr(expr):
__slots__ = "target", "value",
def __init__(self, value, target):
self.value = value
self.target = target
class Attribute(expr):
__slots__ = "value", "attr", "ctx",
def __init__(self, value, attr, ctx):
self.value = value
self.attr = attr
self.ctx = ctx
class Await(expr):
__slots__ = "value",
def __init__(self, value):
self.value = value
class BinOp(expr):
__slots__ = "left", "op", "right",
def __init__(self, left, op, right):
self.left = left
self.op = op
self.right = right
class BoolOp(expr):
__slots__ = "op", "values",
def __init__(self, op, values):
self.op = op
self.values = values
class Bytes(expr):
__slots__ = "s", "prefix", "implicitly_concatenated_parts",
def __init__(self, s, prefix, implicitly_concatenated_parts):
self.s = s
self.prefix = prefix
self.implicitly_concatenated_parts = implicitly_concatenated_parts
class Call(expr):
__slots__ = "func", "positional_args", "named_args",
def __init__(self, func, positional_args, named_args):
self.func = func
self.positional_args = positional_args
self.named_args = named_args
class ClassExpr(expr):
'AST node representing class creation'
__slots__ = "name", "type_parameters", "bases", "keywords", "inner_scope",
def __init__(self, name, type_parameters, bases, keywords, inner_scope):
self.name = name
self.type_parameters = type_parameters
self.bases = bases
self.keywords = keywords
self.inner_scope = inner_scope
class Compare(expr):
__slots__ = "left", "ops", "comparators",
def __init__(self, left, ops, comparators):
self.left = left
self.ops = ops
self.comparators = comparators
class Dict(expr):
__slots__ = "items",
def __init__(self, items):
self.items = items
class DictComp(expr):
__slots__ = "key", "value", "generators", "function", "iterable",
def __init__(self, key, value, generators):
self.key = key
self.value = value
self.generators = generators
class Ellipsis(expr):
pass
class Filter(expr):
'''Filtered expression in a template'''
__slots__ = "value", "filter",
def __init__(self, value, filter):
self.value = value
self.filter = filter
class FormattedValue(expr):
__slots__ = "value", "conversion", "format_spec",
def __init__(self, value, conversion, format_spec):
self.value = value
self.conversion = conversion
self.format_spec = format_spec
class FunctionExpr(expr):
'AST node representing function creation'
__slots__ = "name", "args", "returns", "inner_scope",
def __init__(self, name, args, returns, inner_scope):
self.name = name
self.args = args
self.returns = returns
self.inner_scope = inner_scope
class GeneratorExp(expr):
__slots__ = "elt", "generators", "function", "iterable",
def __init__(self, elt, generators):
self.elt = elt
self.generators = generators
class IfExp(expr):
__slots__ = "test", "body", "orelse",
def __init__(self, test, body, orelse):
self.test = test
self.body = body
self.orelse = orelse
class ImportExpr(expr):
'''AST node representing module import
(roughly equivalent to the runtime call to __import__)'''
__slots__ = "level", "name", "top",
def __init__(self, level, name, top):
self.level = level
self.name = name
self.top = top
class ImportMember(expr):
'''AST node representing 'from import'. Similar to Attribute access,
but during import'''
__slots__ = "module", "name",
def __init__(self, module, name):
self.module = module
self.name = name
class JoinedStr(expr):
__slots__ = "values",
def __init__(self, values):
self.values = values
class Lambda(expr):
__slots__ = "args", "inner_scope",
def __init__(self, args, inner_scope):
self.args = args
self.inner_scope = inner_scope
class List(expr):
__slots__ = "elts", "ctx",
def __init__(self, elts, ctx):
self.elts = elts
self.ctx = ctx
class ListComp(expr):
__slots__ = "elt", "generators", "function", "iterable",
def __init__(self, elt, generators):
self.elt = elt
self.generators = generators
class Match(stmt):
__slots__ = "subject", "cases",
def __init__(self, subject, cases):
self.subject = subject
self.cases = cases
class Case(stmt):
__slots__ = "pattern", "guard", "body",
def __init__(self, pattern, guard, body):
self.pattern = pattern
self.guard = guard
self.body = body
class Guard(expr):
__slots__ = "test",
def __init__(self, test):
self.test = test
class MatchAsPattern(pattern):
__slots__ = "pattern", "alias",
def __init__(self, pattern, alias):
self.pattern = pattern
self.alias = alias
class MatchOrPattern(pattern):
__slots__ = "patterns",
def __init__(self, patterns):
self.patterns = patterns
class MatchLiteralPattern(pattern):
__slots__ = "literal",
def __init__(self, literal):
self.literal = literal
class MatchCapturePattern(pattern):
__slots__ = "variable",
def __init__(self, variable):
self.variable = variable
class MatchWildcardPattern(pattern):
__slots__ = []
class MatchValuePattern(pattern):
__slots__ = "value",
def __init__(self, value):
self.value = value
class MatchSequencePattern(pattern):
__slots__ = "patterns",
def __init__(self, patterns):
self.patterns = patterns
class MatchStarPattern(pattern):
__slots__ = "target",
def __init__(self, target):
self.target = target
class MatchMappingPattern(pattern):
__slots__ = "mappings",
def __init__(self, mappings):
self.mappings = mappings
class MatchDoubleStarPattern(pattern):
__slots__ = "target",
def __init__(self, target):
self.target = target
class MatchKeyValuePattern(pattern):
__slots__ = "key", "value",
def __init__(self, key, value):
self.key = key
self.value = value
class MatchClassPattern(pattern):
__slots__ = "class_name", "positional", "keyword",
def __init__(self, class_name, positional, keyword):
self.class_name = class_name
self.positional = positional
self.keyword = keyword
class MatchKeywordPattern(pattern):
__slots__ = "attribute", "value",
def __init__(self, attribute, value):
self.attribute = attribute
self.value = value
class Name(expr):
__slots__ = "variable", "ctx",
def __init__(self, variable, ctx):
self.variable = variable
self.ctx = ctx
@property
def id(self):
return self.variable.id
class Num(expr):
__slots__ = "n", "text",
def __init__(self, n, text):
self.n = n
self.text = text
class ParamSpec(type_parameter):
__slots__ = "name", "default",
def __init__(self, name, default):
self.name = name
self.default = default
class PlaceHolder(expr):
'''PlaceHolder variable in template ($name)'''
__slots__ = "variable", "ctx",
def __init__(self, variable, ctx):
self.variable = variable
self.ctx = ctx
@property
def id(self):
return self.variable.id
class Repr(expr):
__slots__ = "value",
def __init__(self, value):
self.value = value
class Set(expr):
__slots__ = "elts",
def __init__(self, elts):
self.elts = elts
class SetComp(expr):
__slots__ = "elt", "generators", "function", "iterable",
def __init__(self, elt, generators):
self.elt = elt
self.generators = generators
class Slice(expr):
'''AST node for a slice as a subclass of expr to simplify Subscripts'''
__slots__ = "start", "stop", "step",
def __init__(self, start, stop, step):
self.start = start
self.stop = stop
self.step = step
class Starred(expr):
__slots__ = "value", "ctx",
def __init__(self, value, ctx):
self.value = value
self.ctx = ctx
class Str(expr):
__slots__ = "s", "prefix", "implicitly_concatenated_parts",
def __init__(self, s, prefix, implicitly_concatenated_parts):
self.s = s
self.prefix = prefix
self.implicitly_concatenated_parts = implicitly_concatenated_parts
class Subscript(expr):
__slots__ = "value", "index", "ctx",
def __init__(self, value, index, ctx):
self.value = value
self.index = index
self.ctx = ctx
class TemplateDottedNotation(expr):
'''Unified dot notation expression in a template'''
__slots__ = "value", "attr", "ctx",
def __init__(self, value, attr, ctx):
self.value = value
self.attr = attr
self.ctx = ctx
class Tuple(expr):
__slots__ = "elts", "ctx",
def __init__(self, elts, ctx):
self.elts = elts
self.ctx = ctx
class TypeAlias(stmt):
__slots__ = "name", "type_parameters", "value",
def __init__(self, name, type_parameters, value):
self.name = name
self.type_parameters = type_parameters
self.value = value
class TypeVar(type_parameter):
__slots__ = "name", "bound", "default"
def __init__(self, name, bound, default):
self.name = name
self.bound = bound
self.default = default
class TypeVarTuple(type_parameter):
__slots__ = "name", "default",
def __init__(self, name, default):
self.name = name
self.default = default
class UnaryOp(expr):
__slots__ = "op", "operand",
def __init__(self, op, operand):
self.op = op
self.operand = operand
class Yield(expr):
__slots__ = "value",
def __init__(self, value):
self.value = value
class YieldFrom(expr):
__slots__ = "value",
def __init__(self, value):
self.value = value
class SpecialOperation(expr):
__slots__ = "name", "arguments"
def __init__(self, name, arguments):
self.name = name
self.arguments = arguments
class AugLoad(expr_context):
pass
class AugStore(expr_context):
pass
class Del(expr_context):
pass
class Load(expr_context):
pass
class Param(expr_context):
pass
class Store(expr_context):
pass
class Add(operator):
pass
class BitAnd(operator):
pass
class BitOr(operator):
pass
class BitXor(operator):
pass
class Div(operator):
pass
class FloorDiv(operator):
pass
class LShift(operator):
pass
class MatMult(operator):
pass
class Mod(operator):
pass
class Mult(operator):
pass
class Pow(operator):
pass
class RShift(operator):
pass
class Sub(operator):
pass
class AnnAssign(stmt):
__slots__ = "value", "annotation", "target",
def __init__(self, value, annotation, target):
self.value = value
self.annotation = annotation
self.target = target
class Assert(stmt):
__slots__ = "test", "msg",
def __init__(self, test, msg):
self.test = test
self.msg = msg
class Assign(stmt):
__slots__ = "targets", "value",
def __init__(self, value, targets):
self.value = value
assert isinstance(targets, list)
self.targets = targets
class AugAssign(stmt):
__slots__ = "operation",
def __init__(self, operation):
self.operation = operation
class Break(stmt):
pass
class Continue(stmt):
pass
class Delete(stmt):
__slots__ = "targets",
def __init__(self, targets):
self.targets = targets
class ExceptStmt(stmt):
'''AST node for except handler, as a subclass of stmt in order
to better support location and flow control'''
__slots__ = "type", "name", "body",
def __init__(self, type, name, body):
self.type = type
self.name = name
self.body = body
class ExceptGroupStmt(stmt):
'''AST node for except* handler, as a subclass of stmt in order
to better support location and flow control'''
__slots__ = "type", "name", "body",
def __init__(self, type, name, body):
self.type = type
self.name = name
self.body = body
class Exec(stmt):
__slots__ = "body", "globals", "locals",
def __init__(self, body, globals, locals):
self.body = body
self.globals = globals
self.locals = locals
class Expr(stmt):
__slots__ = "value",
def __init__(self, value):
self.value = value
class For(stmt):
__slots__ = "is_async", "target", "iter", "body", "orelse",
def __init__(self, target, iter, body, orelse, is_async=False):
self.target = target
self.iter = iter
self.body = body
self.orelse = orelse
self.is_async = is_async
class Global(stmt):
__slots__ = "names",
def __init__(self, names):
self.names = names
class If(stmt):
__slots__ = "test", "body", "orelse",
def __init__(self, test, body, orelse):
self.test = test
self.body = body
self.orelse = orelse
class Import(stmt):
__slots__ = "names",
def __init__(self, names):
self.names = names
class ImportFrom(stmt):
__slots__ = "module",
def __init__(self, module):
self.module = module
class Nonlocal(stmt):
__slots__ = "names",
def __init__(self, names):
self.names = names
class Pass(stmt):
pass
class Print(stmt):
__slots__ = "dest", "values", "nl",
def __init__(self, dest, values, nl):
self.dest = dest
self.values = values
self.nl = nl
class Raise(stmt):
__slots__ = "exc", "cause", "type", "inst", "tback",
class Return(stmt):
__slots__ = "value",
def __init__(self, value):
self.value = value
class TemplateWrite(stmt):
'''Template text'''
__slots__ = "value",
def __init__(self, value):
self.value = value
class Try(stmt):
__slots__ = "body", "orelse", "handlers", "finalbody",
def __init__(self, body, orelse, handlers, finalbody):
self.body = body
self.orelse = orelse
self.handlers = handlers
self.finalbody = finalbody
class While(stmt):
__slots__ = "test", "body", "orelse",
def __init__(self, test, body, orelse):
self.test = test
self.body = body
self.orelse = orelse
class With(stmt):
__slots__ = "is_async", "context_expr", "optional_vars", "body",
def __init__(self, context_expr, optional_vars, body, is_async=False):
self.context_expr = context_expr
self.optional_vars = optional_vars
self.body = body
self.is_async = is_async
class Invert(unaryop):
pass
class Not(unaryop):
pass
class UAdd(unaryop):
pass
class USub(unaryop):
pass
class Variable(object):
'A variable'
def __init__(self, var_id, scope = None):
assert isinstance(var_id, str), type(var_id)
self.id = var_id
self.scope = scope
def __repr__(self):
return 'Variable(%r, %r)' % (self.id, self.scope)
def __eq__(self, other):
if type(other) is not Variable:
return False
if self.scope is None or other.scope is None:
raise TypeError("Scope not set")
return self.scope == other.scope and self.id == other.id
def __ne__(self, other):
return not self == other
def __hash__(self):
if self.scope is None:
raise TypeError("Scope not set")
return 391246 ^ hash(self.id) ^ hash(self.scope)
def is_global(self):
return isinstance(self.scope, Module)
def iter_fields(node):
for name in node.__slots__:
if hasattr(node, name):
yield name, getattr(node, name)