Struct StrLangFunction 

pub struct StrLangFunction;

STRLANG(str, lang) - Creates a language-tagged literal

Creates a new literal with the specified language tag. The language tag must be a valid BCP47 language tag (lowercased).

Examples

STRLANG("chat", "fr") → "chat"@fr
STRLANG("Hello", "en") → "Hello"@en

Trait Implementations

impl Clone for StrLangFunction

fn clone(&self) -> StrLangFunction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl CustomFunction for StrLangFunction

fn name(&self) -> &str

Function name (IRI)

fn arity(&self) -> Option<usize>

Function arity (number of parameters), None for variadic

fn parameter_types(&self) -> Vec<ValueType>

Function parameter types

fn return_type(&self) -> ValueType

Function return type

fn documentation(&self) -> &str

Function documentation

fn clone_function(&self) -> Box<dyn CustomFunction>

Clone this function (for registry operations)

fn execute(&self, args: &[Value], _context: &ExecutionContext) -> Result<Value>

Execute the function

fn validate(&self, args: &[Expression]) -> Result<()>

Validate function call at compile time

fn cost_estimate(&self, args: &[Expression]) -> f64

Estimate execution cost

fn is_deterministic(&self) -> bool

Check if function is deterministic

fn can_pushdown(&self) -> bool

Check if function can be pushed down

impl Debug for StrLangFunction

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

Formats the value using the given formatter.