Struct StrLangDirFunction 

pub struct StrLangDirFunction;

STRLANGDIR(str, lang, dir) - Creates a language and direction-tagged literal

Creates a new literal with specified language tag and text direction. Part of RDF 1.2 specification for bidirectional text support.

Examples

STRLANGDIR("Hello", "en", "ltr") → "Hello"@en--ltr
STRLANGDIR("مرحبا", "ar", "rtl") → "مرحبا"@ar--rtl

Trait Implementations

impl Clone for StrLangDirFunction

fn clone(&self) -> StrLangDirFunction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl CustomFunction for StrLangDirFunction

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 StrLangDirFunction

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

Formats the value using the given formatter.