Struct TextBeforeFn 

pub struct TextBeforeFn;

Trait Implementations

impl Debug for TextBeforeFn

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

Formats the value using the given formatter.

impl Function for TextBeforeFn

Returns text that appears before a delimiter.

Remarks

• Delimiter matching is case-sensitive.
• instance_num defaults to 1; negative instances search from the end.
• instance_num=0 or empty delimiter returns #VALUE!.
• If requested delimiter occurrence is not found, returns #N/A.

Examples

title: "Text before first delimiter"
formula: '=TEXTBEFORE("a-b-c", "-")'
expected: "a"

title: "Text before last delimiter"
formula: '=TEXTBEFORE("a-b-c", "-", -1)'
expected: "a-b"

related:
  - TEXTAFTER
  - FIND
  - SEARCH
faq:
  - q: "What happens when the delimiter is missing?"
    a: "TEXTBEFORE returns #N/A when the requested delimiter occurrence is not found."

[formualizer-docgen:schema:start] Name: TEXTBEFORE Type: TextBeforeFn Min args: 2 Max args: 3 Variadic: false Signature: TEXTBEFORE(arg1: any@scalar, arg2: any@scalar, arg3?: number@scalar) Arg schema: arg1{kinds=any,required=true,shape=scalar,by_ref=false,coercion=None,max=None,repeating=None,default=false}; arg2{kinds=any,required=true,shape=scalar,by_ref=false,coercion=None,max=None,repeating=None,default=false}; arg3{kinds=number,required=false,shape=scalar,by_ref=false,coercion=NumberLenientText,max=None,repeating=None,default=true} 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.