Struct NumberFormat 

pub struct NumberFormat {
    pub grouping: Grouping,
    pub group_sep: char,
    pub decimal_sep: char,
    pub floats: bool,
    pub float_precision: Option<u8>,
}

How numbers are rendered. Resolved from config once at load time.

Fields

grouping: Grouping

group_sep: char

Character placed between digit groups.

decimal_sep: char

Character used as the decimal point.

floats: bool

Apply grouping to float columns as well as integer columns.

float_precision: Option<u8>

Fixed decimal places for floats. None keeps the default rendering.

Implementations

impl NumberFormat

pub const PLAIN: Self

Renders numbers exactly as Polars would — no grouping, no precision override. This is the default so an upgrade changes nothing.

pub const CHROME: Self

Comma grouping with no digit threshold, used for the application’s own labels rather than the user’s data.

pub const PRESET_NAMES: &'static [&'static str]

Every preset name, for CLI value parsing and error messages.

pub fn preset(name: &str) -> Option<Self>

A named preset covering common locale conventions without ICU/CLDR data (see docs/user-guide/configuration.md on why formatting is explicit).

pub fn is_noop(&self) -> bool

True when this format would render every value exactly as Polars does, so callers can take the zero-cost passthrough path.

pub fn width_i64(&self, v: i64) -> usize

Display width (in characters) of v as this format would render it, computed arithmetically — no string is built.

pub fn width_u64(&self, v: u64) -> usize

Display width (in characters) of v as this format would render it.

pub fn write_i64(&self, v: i64, out: &mut String) -> usize

Append v to out, returning the display width in characters.

pub fn write_u64(&self, v: u64, out: &mut String) -> usize

Append v to out, returning the display width in characters.

pub fn write_f64(&self, v: f64, scratch: &mut String, out: &mut String) -> usize

Append v to out, returning its display width; scratch is a reused buffer.

pub fn regroup_decimal(&self, src: &str, out: &mut String) -> usize

Group the integer part of an already-rendered decimal and apply decimal_sep, returning the width. Keeps Polars’ rendering (decimal places never change with formatting); non-plain decimals (NaN, inf, scientific) pass through.

Trait Implementations

impl Clone for NumberFormat

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NumberFormat

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

Formats the value using the given formatter.

impl Default for NumberFormat

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for NumberFormat

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for NumberFormat