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Extended type narrowing for type guards of the form x[I] is B
and x[I] is not B
where x
is a tuple and B
is an enum literal.
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@ -68,7 +68,7 @@ In addition to assignment-based type narrowing, Pyright supports the following t
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* `x.y == L` and `x.y != L` (where L is a literal expression and x is a type that is distinguished by a field or property with a literal type)
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* `x[K] == V`, `x[K] != V`, `x[K] is V`, and `x[K] is not V` (where K and V are literal expressions and x is a type that is distinguished by a TypedDict field with a literal type)
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* `x[I] == V` and `x[I] != V` (where I and V are literal expressions and x is a known-length tuple that is distinguished by the index indicated by I)
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* `x[I] is B` and `x[I] is not B` (where I is a literal expression, B is a `bool` literal, and x is a known-length tuple that is distinguished by the index indicated by I)
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* `x[I] is B` and `x[I] is not B` (where I is a literal expression, B is a `bool` or enum literal, and x is a known-length tuple that is distinguished by the index indicated by I)
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* `x[I] is None` and `x[I] is not None` (where I is a literal expression and x is a known-length tuple that is distinguished by the index indicated by I)
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* `len(x) == L` and `len(x) != L` (where x is tuple and L is a literal integer)
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* `x in y` or `x not in y` (where y is instance of list, set, frozenset, deque, tuple, dict, defaultdict, or OrderedDict)
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@ -29,6 +29,7 @@ import { getScopeForNode } from './scopeUtils';
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import { Symbol, SymbolFlags } from './symbol';
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import { getTypedDictMembersForClass } from './typedDicts';
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import { EvaluatorFlags, TypeEvaluator } from './typeEvaluatorTypes';
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import { EnumLiteral } from './types';
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import {
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ClassType,
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ClassTypeFlags,
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@ -281,11 +282,16 @@ export function getTypeNarrowingCallback(
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const rightTypeResult = evaluator.getTypeOfExpression(testExpression.rightExpression);
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const rightType = rightTypeResult.type;
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if (
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isClassInstance(rightType) &&
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ClassType.isBuiltIn(rightType, 'bool') &&
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rightType.literalValue !== undefined
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) {
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if (isClassInstance(rightType) && rightType.literalValue !== undefined) {
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let canNarrow = false;
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// Narrowing can be applied only for bool or enum literals.
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if (ClassType.isBuiltIn(rightType, 'bool')) {
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canNarrow = true;
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} else if (rightType.literalValue instanceof EnumLiteral) {
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canNarrow = true;
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}
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if (canNarrow) {
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return (type: Type) => {
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return {
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type: narrowTypeForDiscriminatedTupleComparison(
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@ -303,6 +309,7 @@ export function getTypeNarrowingCallback(
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}
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}
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}
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}
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if (equalsOrNotEqualsOperator) {
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// Look for X == <literal> or X != <literal>
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@ -1,6 +1,7 @@
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# This sample tests the type narrowing for known-length tuples
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# that have an entry with a declared literal type.
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from enum import Enum
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from typing import Literal
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MsgA = tuple[Literal[1], str]
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@ -41,3 +42,28 @@ def func4(m: MsgCOrD):
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reveal_type(m, expected_text="tuple[Literal[False], float]")
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else:
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reveal_type(m, expected_text="tuple[Literal[True], str]")
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class MyEnum(Enum):
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A = 0
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B = 1
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MsgE = tuple[Literal[MyEnum.A], str]
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MsgF = tuple[Literal[MyEnum.B], float]
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MsgEOrF = MsgE | MsgF
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def func5(m: MsgEOrF):
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if m[0] is MyEnum.A:
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reveal_type(m, expected_text="tuple[Literal[MyEnum.A], str]")
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else:
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reveal_type(m, expected_text="tuple[Literal[MyEnum.B], float]")
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def func6(m: MsgEOrF):
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if m[0] is not MyEnum.A:
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reveal_type(m, expected_text="tuple[Literal[MyEnum.B], float]")
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else:
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reveal_type(m, expected_text="tuple[Literal[MyEnum.A], str]")
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