BackendExpectations class

What a particular backend is expected to support. The spec-fallback FluentBackend sets everything false; CLDR backends declare exactly what they render. Every flag here has a matching conformance check — a backend's declaration IS tested, in both directions: a true flag runs the positive rendering check, and (under recordsUnsupportedOptionErrors) a false flag runs the degrade check (still renders, records an error, never throws).

Constructors

BackendExpectations({bool localeAwarePlurals = true, bool operandAwarePlurals = true, bool signDisplay = true, bool roundingMode = true, bool roundingIncrement = true, bool trailingZeroDisplay = true, bool numberingSystem = true, bool groupingStrategies = true, bool compactNotation = true, bool scientificNotation = false, bool accountingCurrencySign = false, bool hourCycle = true, bool calendar = true, bool timeZone = true, bool ecmaDefaultDigits = true, bool recordsUnsupportedOptionErrors = false})
Declares one backend's honest capability set; every flag defaults to the capable side so a new check is opt-out.
const

Properties

accountingCurrencySign → bool
ECMA-402 currencySign: accounting. Off by default — ICU4X ships no accounting patterns, so the icu backend degrades.
final
calendar → bool
ECMA-402 calendar on DATETIME (buddhist, japanese, islamic, …).
final
compactNotation → bool
ECMA-402 notation: compact (+ compactDisplay).
final
ecmaDefaultDigits → bool
ECMA-402 default digit resolution when NO digit options are given: decimal caps at 3 fraction digits, percent at 0, currency renders its per-currency minor units. Rendering must also agree with the 3-digit default the core's plural operands resolve with.
final
groupingStrategies → bool
ECMA-402 v3 useGrouping strategy strings (min2 / always), on top of the boolean forms every backend handles.
final
hashCode → int
The hash code for this object.
no setterinherited
hourCycle → bool
ECMA-402 hourCycle on DATETIME (h11 / h12 / h23 / h24).
final
localeAwarePlurals → bool
Whether the backend classifies numbers into real CLDR plural categories (vs. always other).
final
numberingSystem → bool
ECMA-402 numberingSystem on NUMBER (e.g. arab digits).
final
operandAwarePlurals → bool
Whether plural selection honors visible fraction digits (CLDR operand v) — the F8 case. A backend that classifies by the bare numeric value sets this false until it can consume a digit string.
final
recordsUnsupportedOptionErrors → bool
Whether an option the backend does NOT support (a false flag above) still renders a usable string AND records a FluentError. The uniform-degrade contract; backends flip this on once their degrade paths are wired.
final
roundingIncrement → bool
ECMA-402 roundingIncrement (nickel rounding etc.).
final
roundingMode → bool
ECMA-402 roundingMode (the nine modes).
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
scientificNotation → bool
ECMA-402 notation: scientific / engineering. Off by default — ICU4X ships no exponent-symbol data, so the icu backend degrades.
final
signDisplay → bool
ECMA-402 signDisplay (always / never / exceptZero / negative).
final
timeZone → bool
ECMA-402 timeZone on DATETIME (IANA zone ids).
final
trailingZeroDisplay → bool
ECMA-402 trailingZeroDisplay: stripIfInteger.
final

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited