Enum Condition 

pub enum Condition {
    KeyValue {
        key: ConditionKey,
        value: String,
    },
    All(Vec<Condition>),
    Any(Vec<Condition>),
    Not(Box<Condition>),
}

Typed AST for a cfg(...) target condition.

The wire format matches the manifest text: a key/value (key = "value") leaf, or one of the all / any / not combinators. Equality and ordering are structural, so identical expressions always compare equal regardless of whitespace or quote style in the original source.

Variants

KeyValue

key = "value". The key is restricted to the ConditionKey set; the value is a free-form ASCII string interpreted by evaluate.

Fields

key: ConditionKey

value: String

All(Vec<Condition>)

all(<conditions>). Empty all() is rejected at parse time.

Any(Vec<Condition>)

any(<conditions>). Empty any() is rejected at parse time.

Not(Box<Condition>)

not(<single condition>).

Implementations

impl Condition

pub fn parse_cfg(input: &str) -> Result<Self, ConditionParseError>

Parse a full cfg(...) expression. The wrapping cfg(...) is required so the parser is symmetric with the manifest text users write.

Errors

Returns ConditionParseError::ExpectedCfgPrefix when the input is not wrapped in cfg(, ConditionParseError::UnbalancedParens when the trailing ) is missing, and propagates any ConditionParseError from parsing the inner expression.

pub fn parse_inner(input: &str) -> Result<Self, ConditionParseError>

Parse the inner expression of a cfg(...) form (no cfg( prefix or trailing )). Useful for the metadata round-trip path, where we store the inner form.

Errors

Returns a ConditionParseError when the expression is malformed — e.g. an unsupported key, a missing = or quoted value, an empty all()/any(), a not() of wrong arity, unbalanced parentheses, or trailing input after the expression.

pub fn evaluate(&self, platform: &TargetPlatform) -> bool

Evaluate this condition against platform. The result is fully determined by platform and the condition’s AST — no global state, no environment lookup, no I/O.

Trait Implementations

impl Clone for Condition

fn clone(&self) -> Condition

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Condition

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Condition

fn deserialize<D: Deserializer<'de>>(d: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl Display for Condition

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Canonical string form. Round-trips through Condition::parse_inner.

impl Hash for Condition

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Condition

fn cmp(&self, other: &Condition) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Condition

fn eq(&self, other: &Condition) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Condition

fn partial_cmp(&self, other: &Condition) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for Condition

fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl Eq for Condition

impl StructuralPartialEq for Condition