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https://github.com/RevenueCat/purchases-ios
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Antonio PallaresandCursor
bc1186542e
rc.length justifies throwing with a missing var, which cannot reach the operator any more: the lookup raises first, as length_missing_variable_fails_at_the_lookup pins. The reason now rests on a key that is present but holds null, the case that does reach it. objectList tells providers a record must carry everything a predicate about it needs. rc.rootVar reaches the snapshot from inside an iteration scope, so that is no longer the only option. Co-authored-by: Cursor <cursoragent@cursor.com>
50 lines
1.8 KiB
Swift
50 lines
1.8 KiB
Swift
//
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// LengthOperator.swift
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//
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// Created by Antonio Pallares.
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//
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import Foundation
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extension RulesEngine {
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/// `rc.length` — element count for arrays, UTF-16 code-unit count for
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/// strings (JS `String.length` parity).
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enum LengthOperator {
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/// `{"rc.length": value}` — returns a numeric length suitable for
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/// arithmetic and comparisons.
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///
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/// - **String**: length in **UTF-16 code units**, not Swift grapheme
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/// clusters — matches JS `String.length` and the same choice in
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/// `AccessorOperators.opMissingSome` (`string.utf16.count`).
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/// - **Array**: element count (`.count`).
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/// - **Anything else**: throws `EvaluationError.typeMismatch`.
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///
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/// Non-string/non-array inputs throw rather than defaulting to `0`.
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/// A silent zero would make `{"==": [{"rc.length": {"var": "note"}},
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/// 0]}` quietly true for a key that is present but holds `null`.
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///
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/// Uses `Operators.firstArgEvaluated` spread semantics; extra arguments
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/// are silently ignored. Literal array operands must be wrapped
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/// (e.g. `{"rc.length": [[1, 2, 3]]}`), not passed as a multi-element
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/// arg list.
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static func opLength(args: Value, vars: Scope) throws -> Value {
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let input = try Operators.firstArgEvaluated(args, vars: vars)
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switch input {
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case .string(let string):
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return .int(Int64(string.utf16.count))
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case .array(let items):
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return .int(Int64(items.count))
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default:
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throw EvaluationError.typeMismatch(
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message: "operator 'rc.length' expected string or array, got \(input)"
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)
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}
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}
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}
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}
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