Struct target_spec::TargetSpecExpression

pub struct TargetSpecExpression { /* private fields */ }

A target expression, parsed from a string beginning with cfg(.

For more information, see TargetSpec.

Implementations

impl TargetSpecExpression

pub fn new(input: &str) -> Result<Self, ExpressionParseError>

Creates a new TargetSpecExpression from a string beginning with cfg(.

Returns an error if the string could not be parsed, or if the string contains a predicate that wasn’t understood by target-spec.

pub fn expression_str(&self) -> &str

Returns the string that was parsed into self.

pub fn eval(&self, platform: &Platform) -> Option<bool>

Evaluates this expression against the given platform.

Returns Some(true) if there’s a match, Some(false) if there’s none, or None if the result of the evaluation is unknown (typically found if target features are involved).

Trait Implementations

impl Clone for TargetSpecExpression

fn clone(&self) -> TargetSpecExpression

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for TargetSpecExpression

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

Formats the value using the given formatter.

impl Display for TargetSpecExpression

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

Formats the value using the given formatter.

impl FromStr for TargetSpecExpression

type Err = ExpressionParseError

The associated error which can be returned from parsing.

fn from_str(input: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.