77 lines
1.6 KiB
Rust
77 lines
1.6 KiB
Rust
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/* number.rs
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* Eryn Wells <eryn@erynwells.me>
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*/
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struct Number {
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value: f64,
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}
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#[derive(Debug)]
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pub enum Radix { Bin, Oct, Dec, Hex }
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#[derive(Debug)]
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pub struct NumberBuilder {
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exact: bool,
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radix: Radix,
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value: f64,
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}
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impl NumberBuilder {
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pub fn new() -> NumberBuilder {
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NumberBuilder {
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exact: false,
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radix: Radix::Dec,
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value: 0.0,
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}
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}
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pub fn exact<'a>(&'a mut self, ex: bool) -> &'a mut Self {
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self.exact = ex;
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self
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}
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pub fn radix<'a>(&'a mut self, r: Radix) -> &'a mut Self {
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self.radix = r;
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self
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}
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pub fn resolve(&self) -> Number {
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// TODO: Convert fields to Number type.
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Number { value: 0.0 }
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}
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pub fn extend_value<'a>(&'a mut self, digit: char) -> &'a mut Self {
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if let Some(place) = NumberBuilder::place_value(digit) {
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self.value = self.radix.value() * self.value + place;
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}
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else {
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// TODO: Indicate an error.
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}
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self
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}
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pub fn radix_value(&self) -> u32 {
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self.radix.value() as u32
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}
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fn place_value(digit: char) -> Option<f64> {
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match digit {
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'0' ... '9' => Some((digit as u32 - '0' as u32) as f64),
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'a' ... 'f' => Some((digit as u32 - 'a' as u32) as f64),
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'A' ... 'F' => Some((digit as u32 - 'A' as u32) as f64),
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_ => None,
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}
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}
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}
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impl Radix {
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fn value(&self) -> f64 {
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match *self {
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Radix::Bin => 2.0,
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Radix::Oct => 8.0,
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Radix::Dec => 10.0,
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Radix::Hex => 16.0,
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}
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}
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}
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