90 lines
1.8 KiB
Rust
90 lines
1.8 KiB
Rust
use std::{
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io::{Result, Write},
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ops::Range,
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};
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#[derive(PartialEq, Eq)]
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pub enum Label {
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Forward,
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Backward,
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If,
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}
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#[derive(Default)]
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pub struct Manager {
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label_list: Vec<Label>,
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pub num_param: usize,
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}
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impl Manager {
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pub fn label_list(&self) -> &[Label] {
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&self.label_list
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}
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pub fn push_label(&mut self, label: Label) -> usize {
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self.label_list.push(label);
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self.label_list.len() - 1
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}
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pub fn pop_label(&mut self) {
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self.label_list.pop().unwrap();
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}
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}
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pub trait Driver {
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fn write(&self, mng: &mut Manager, w: &mut dyn Write) -> Result<()>;
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}
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pub fn write_separated<I, T, M>(mut iter: I, mut func: M, w: &mut dyn Write) -> Result<()>
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where
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M: FnMut(T, &mut dyn Write) -> Result<()>,
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I: Iterator<Item = T>,
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{
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match iter.next() {
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Some(first) => func(first, w)?,
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None => return Ok(()),
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}
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iter.try_for_each(|v| {
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write!(w, ", ")?;
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func(v, w)
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})
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}
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pub fn write_ascending(prefix: &str, range: Range<usize>, w: &mut dyn Write) -> Result<()> {
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write_separated(range, |i, w| write!(w, "{prefix}_{i}"), w)
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}
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pub fn write_f32(number: f32, w: &mut dyn Write) -> Result<()> {
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let sign = if number.is_sign_negative() { "-" } else { "" };
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if number.is_infinite() {
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write!(w, "{sign}math.huge ")
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} else if number.is_nan() {
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write!(w, "{sign}0/0 ")
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} else {
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write!(w, "{number:e} ")
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}
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}
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pub fn write_f64(number: f64, w: &mut dyn Write) -> Result<()> {
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let sign = if number.is_sign_negative() { "-" } else { "" };
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if number.is_infinite() {
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write!(w, "{sign}math.huge ")
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} else if number.is_nan() {
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write!(w, "{sign}0/0 ")
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} else {
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write!(w, "{number:e} ")
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}
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}
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pub fn write_variable(var: usize, mng: &Manager, w: &mut dyn Write) -> Result<()> {
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if let Some(rem) = var.checked_sub(mng.num_param) {
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write!(w, "loc_{rem} ")
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} else {
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write!(w, "param_{var} ")
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}
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}
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