Struct ProperFn 

pub struct ProperFn;

Trait Implementations

impl Debug for ProperFn

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

Formats the value using the given formatter.

impl Function for ProperFn

Capitalizes the first letter of each alphanumeric word.

Remarks

• Word boundaries are reset by non-alphanumeric characters.
• Internal letters in each word are lowercased.
• Non-text inputs are coerced to text.
• Errors are propagated unchanged.

Examples

title: "Title case simple phrase"
formula: '=PROPER("hello world")'
expected: "Hello World"

title: "Hyphen-separated words"
formula: '=PROPER("north-east REGION")'
expected: "North-East Region"

related:
  - UPPER
  - LOWER
  - TRIM
faq:
  - q: "How are word boundaries determined?"
    a: "Any non-alphanumeric character starts a new word boundary for capitalization."

[formualizer-docgen:schema:start] Name: PROPER Type: ProperFn Min args: 1 Max args: 1 Variadic: false Signature: PROPER(arg1: any@scalar) Arg schema: arg1{kinds=any,required=true,shape=scalar,by_ref=false,coercion=None,max=None,repeating=None,default=false} Caps: PURE [formualizer-docgen:schema:end]

fn caps(&self) -> FnCaps

Capability flags for this function

fn name(&self) -> &'static str

fn min_args(&self) -> usize

fn arg_schema(&self) -> &'static [ArgSchema]

fn eval<'a, 'b, 'c>( &self, args: &'c [ArgumentHandle<'a, 'b>], _: &dyn FunctionContext<'b>, ) -> Result<CalcValue<'b>, ExcelError>

The unified evaluation path.

fn namespace(&self) -> &'static str

fn variadic(&self) -> bool

fn volatile(&self) -> bool

fn aliases(&self) -> &'static [&'static str]

Optional list of additional alias names (case-insensitive) that should resolve to this function. Default: empty slice. Implementors can override to expose legacy names. Returned slice must have ’static lifetime (typically a static array reference).

fn function_salt(&self) -> u64

fn eval_reference<'a, 'b, 'c>( &self, _args: &'c [ArgumentHandle<'a, 'b>], _ctx: &dyn FunctionContext<'b>, ) -> Option<Result<ReferenceType, ExcelError>>

Optional reference result path. Only called by the interpreter/engine when the callsite expects a reference (e.g., range combinators, by-ref argument positions, or spill sources).

fn dispatch<'a, 'b, 'c>( &self, args: &'c [ArgumentHandle<'a, 'b>], ctx: &dyn FunctionContext<'b>, ) -> Result<CalcValue<'b>, ExcelError>

Dispatch to the unified evaluation path with automatic argument validation.