Enum StringExpression 

pub enum StringExpression {
    Literal(String),
    GetProperty {
        key: String,
        fallback: String,
    },
    GetState {
        key: String,
        fallback: String,
    },
    Concat(Box<StringExpression>, Box<StringExpression>),
    Upcase(Box<StringExpression>),
    Downcase(Box<StringExpression>),
}

A string expression that evaluates to a String.

Used as the input for Match expressions.

Variants

Literal(String)

A constant string literal.

GetProperty

Read a string feature property.

Fields

key: String

Property key.

fallback: String

Fallback when absent or non-string.

GetState

Read a string feature-state value.

Fields

key: String

State key.

fallback: String

Fallback when absent or non-string.

Concat(Box<StringExpression>, Box<StringExpression>)

Concatenate two strings.

Upcase(Box<StringExpression>)

Uppercase.

Downcase(Box<StringExpression>)

Lowercase.

Implementations

impl StringExpression

pub fn eval(&self, ctx: &ExprEvalContext<'_>) -> String

Evaluate this string expression against a context.

Trait Implementations

impl Clone for StringExpression

fn clone(&self) -> StringExpression

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StringExpression

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

Formats the value using the given formatter.

impl PartialEq for StringExpression

fn eq(&self, other: &StringExpression) -> 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 StructuralPartialEq for StringExpression