361 lines
12 KiB
Rust
361 lines
12 KiB
Rust
/**
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* In addition to the terms of the AGPL, this file is governed by the
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* terms of the MIT license, from the original axfive-matrix-dicebot
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* project.
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*/
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use nom::bytes::complete::take_while;
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use nom::error::ErrorKind as NomErrorKind;
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use nom::Err as NomErr;
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use nom::{
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alt, bytes::complete::tag, character::complete::digit1, complete, many0, named,
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sequence::tuple, tag, IResult,
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};
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use super::dice::*;
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//******************************
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//Legacy Code
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//******************************
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fn is_whitespace(input: char) -> bool {
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input == ' ' || input == '\n' || input == '\t' || input == '\r'
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}
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/// Eat whitespace, returning it
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pub fn eat_whitespace(input: &str) -> IResult<&str, &str> {
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let (input, whitespace) = take_while(is_whitespace)(input)?;
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Ok((input, whitespace))
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}
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#[derive(Debug, PartialEq, Eq, Clone, Copy)]
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enum Sign {
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Plus,
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Minus,
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}
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/// Intermediate parsed value for a keep-drop expression to indicate
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/// which one it is.
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enum ParsedKeepOrDrop<'a> {
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Keep(&'a str),
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Drop(&'a str),
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NotPresent,
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}
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macro_rules! too_big {
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($input: expr) => {
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NomErr::Error(($input, NomErrorKind::TooLarge))
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};
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}
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/// Parse a dice expression. Does not eat whitespace
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fn parse_dice(input: &str) -> IResult<&str, Dice> {
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let (input, (count, _, sides)) = tuple((digit1, tag("d"), digit1))(input)?;
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let count: u32 = count.parse().map_err(|_| too_big!(count))?;
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let sides = sides.parse().map_err(|_| too_big!(sides))?;
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let (input, keep_drop) = parse_keep_or_drop(input, count)?;
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Ok((input, Dice::new(count, sides, keep_drop)))
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}
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/// Extract keep/drop number as a string. Fails if the value is not a
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/// string.
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fn parse_keep_or_drop_text<'a>(
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symbol: &'a str,
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input: &'a str,
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) -> IResult<&'a str, ParsedKeepOrDrop<'a>> {
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let (parsed_kd, input) = match tuple::<&str, _, (_, _), _>((tag(symbol), digit1))(input) {
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// if ok, one of the expressions is present
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Ok((rest, (_, kd_expr))) => match symbol {
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"k" => (ParsedKeepOrDrop::Keep(kd_expr), rest),
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"dh" => (ParsedKeepOrDrop::Drop(kd_expr), rest),
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_ => panic!("Unrecogized keep-drop symbol: {}", symbol),
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},
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// otherwise absent (attempt to keep all dice)
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Err(_) => (ParsedKeepOrDrop::NotPresent, input),
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};
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Ok((input, parsed_kd))
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}
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/// Parse keep/drop expression, which consits of "k" or "dh" following
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/// a dice expression. For example, "1d4h3" or "1d4dh2".
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fn parse_keep_or_drop<'a>(input: &'a str, count: u32) -> IResult<&'a str, KeepOrDrop> {
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let (input, keep) = parse_keep_or_drop_text("k", input)?;
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let (input, drop) = parse_keep_or_drop_text("dh", input)?;
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use ParsedKeepOrDrop::*;
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let keep_drop: KeepOrDrop = match (keep, drop) {
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//Potential valid Keep expression.
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(Keep(keep), NotPresent) => match keep.parse().map_err(|_| too_big!(input))? {
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_i if _i > count || _i == 0 => Ok(KeepOrDrop::None),
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i => Ok(KeepOrDrop::Keep(i)),
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},
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//Potential valid Drop expression.
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(NotPresent, Drop(drop)) => match drop.parse().map_err(|_| too_big!(input))? {
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_i if _i >= count => Ok(KeepOrDrop::None),
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i => Ok(KeepOrDrop::Drop(i)),
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},
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//No Keep or Drop specified; regular behavior.
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(NotPresent, NotPresent) => Ok(KeepOrDrop::None),
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//Anything else is an error.
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_ => Err(NomErr::Error((input, NomErrorKind::Many1))),
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}?;
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Ok((input, keep_drop))
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}
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// Parse a single digit expression. Does not eat whitespace
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fn parse_bonus(input: &str) -> IResult<&str, u32> {
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let (input, bonus) = digit1(input)?;
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Ok((input, bonus.parse().unwrap()))
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}
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// Parse a sign expression. Eats whitespace.
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fn parse_sign(input: &str) -> IResult<&str, Sign> {
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let (input, _) = eat_whitespace(input)?;
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named!(sign(&str) -> Sign, alt!(
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complete!(tag!("+")) => { |_| Sign::Plus } |
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complete!(tag!("-")) => { |_| Sign::Minus }
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));
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let (input, sign) = sign(input)?;
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Ok((input, sign))
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}
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// Parse an element expression. Eats whitespace.
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fn parse_element(input: &str) -> IResult<&str, Element> {
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let (input, _) = eat_whitespace(input)?;
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named!(element(&str) -> Element, alt!(
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parse_dice => { |d| Element::Dice(d) } |
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parse_bonus => { |b| Element::Bonus(b) }
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));
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let (input, element) = element(input)?;
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Ok((input, element))
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}
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// Parse a signed element expression. Eats whitespace.
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fn parse_signed_element(input: &str) -> IResult<&str, SignedElement> {
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let (input, _) = eat_whitespace(input)?;
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let (input, sign) = parse_sign(input)?;
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let (input, _) = eat_whitespace(input)?;
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let (input, element) = parse_element(input)?;
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let element = match sign {
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Sign::Plus => SignedElement::Positive(element),
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Sign::Minus => SignedElement::Negative(element),
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};
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Ok((input, element))
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}
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// Parse a full element expression. Eats whitespace.
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pub fn parse_element_expression(input: &str) -> IResult<&str, ElementExpression> {
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named!(first_element(&str) -> SignedElement, alt!(
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parse_signed_element => { |e| e } |
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parse_element => { |e| SignedElement::Positive(e) }
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));
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let (input, first) = first_element(input)?;
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let (input, rest) = if input.trim().is_empty() {
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(input, vec![first])
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} else {
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named!(rest_elements(&str) -> Vec<SignedElement>, many0!(parse_signed_element));
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let (input, mut rest) = rest_elements(input)?;
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rest.insert(0, first);
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(input, rest)
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};
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Ok((input, ElementExpression(rest)))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn dice_test() {
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assert_eq!(
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parse_dice("2d4"),
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Ok(("", Dice::new(2, 4, KeepOrDrop::None)))
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);
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assert_eq!(
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parse_dice("20d40"),
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Ok(("", Dice::new(20, 40, KeepOrDrop::None)))
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);
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assert_eq!(
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parse_dice("8d7"),
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Ok(("", Dice::new(8, 7, KeepOrDrop::None)))
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);
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assert_eq!(
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parse_dice("2d20k1"),
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Ok(("", Dice::new(2, 20, KeepOrDrop::Keep(1))))
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);
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assert_eq!(
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parse_dice("100d10k90"),
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Ok(("", Dice::new(100, 10, KeepOrDrop::Keep(90))))
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);
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assert_eq!(
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parse_dice("11d10k10"),
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Ok(("", Dice::new(11, 10, KeepOrDrop::Keep(10))))
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);
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assert_eq!(
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parse_dice("12d10k11"),
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Ok(("", Dice::new(12, 10, KeepOrDrop::Keep(11))))
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);
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assert_eq!(
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parse_dice("12d10k13"),
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Ok(("", Dice::new(12, 10, KeepOrDrop::None)))
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);
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assert_eq!(
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parse_dice("12d10k0"),
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Ok(("", Dice::new(12, 10, KeepOrDrop::None)))
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);
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assert_eq!(
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parse_dice("20d40dh5"),
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Ok(("", Dice::new(20, 40, KeepOrDrop::Drop(5))))
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);
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assert_eq!(
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parse_dice("8d7dh9"),
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Ok(("", Dice::new(8, 7, KeepOrDrop::None)))
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);
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assert_eq!(
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parse_dice("8d7dh8"),
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Ok(("", Dice::new(8, 7, KeepOrDrop::None)))
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);
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}
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#[test]
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fn cant_have_both_keep_and_drop_test() {
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let res = parse_dice("1d4k3dh2");
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assert!(res.is_err());
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match res {
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Err(NomErr::Error((_, kind))) => {
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assert_eq!(kind, NomErrorKind::Many1);
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}
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_ => panic!("Got success, expected error"),
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}
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}
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#[test]
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fn big_number_of_dice_doesnt_crash_test() {
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let res = parse_dice("64378631476346123874527551481376547657868536d4");
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assert!(res.is_err());
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match res {
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Err(NomErr::Error((input, kind))) => {
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assert_eq!(kind, NomErrorKind::TooLarge);
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assert_eq!(input, "64378631476346123874527551481376547657868536");
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}
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_ => panic!("Got success, expected error"),
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}
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}
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#[test]
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fn big_number_of_sides_doesnt_crash_test() {
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let res = parse_dice("1d423562312587425472658956278456298376234876");
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assert!(res.is_err());
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match res {
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Err(NomErr::Error((input, kind))) => {
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assert_eq!(kind, NomErrorKind::TooLarge);
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assert_eq!(input, "423562312587425472658956278456298376234876");
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}
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_ => panic!("Got success, expected error"),
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}
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}
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#[test]
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fn element_test() {
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assert_eq!(
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parse_element(" \t\n\r\n 8d7 \n"),
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Ok((" \n", Element::Dice(Dice::new(8, 7, KeepOrDrop::None))))
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);
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assert_eq!(
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parse_element(" \t\n\r\n 3d20k2 \n"),
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Ok((" \n", Element::Dice(Dice::new(3, 20, KeepOrDrop::Keep(2)))))
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);
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assert_eq!(
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parse_element(" \t\n\r\n 8 \n"),
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Ok((" \n", Element::Bonus(8)))
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);
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}
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#[test]
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fn signed_element_test() {
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assert_eq!(
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parse_signed_element("+ 7"),
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Ok(("", SignedElement::Positive(Element::Bonus(7))))
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);
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assert_eq!(
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parse_signed_element(" \t\n\r\n- 8 \n"),
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Ok((" \n", SignedElement::Negative(Element::Bonus(8))))
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);
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assert_eq!(
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parse_signed_element(" \t\n\r\n- 8d4 \n"),
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Ok((
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" \n",
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SignedElement::Negative(Element::Dice(Dice::new(8, 4, KeepOrDrop::None)))
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))
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);
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assert_eq!(
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parse_signed_element(" \t\n\r\n- 8d4k4 \n"),
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Ok((
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" \n",
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SignedElement::Negative(Element::Dice(Dice::new(8, 4, KeepOrDrop::Keep(4))))
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))
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);
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assert_eq!(
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parse_signed_element(" \t\n\r\n+ 8d4 \n"),
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Ok((
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" \n",
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SignedElement::Positive(Element::Dice(Dice::new(8, 4, KeepOrDrop::None)))
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))
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);
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}
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#[test]
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fn element_expression_test() {
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assert_eq!(
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parse_element_expression("8d4"),
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Ok((
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"",
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ElementExpression(vec![SignedElement::Positive(Element::Dice(Dice::new(
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8,
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4,
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KeepOrDrop::None
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)))])
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))
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);
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assert_eq!(
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parse_element_expression("\t2d20k1 + 5"),
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Ok((
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"",
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ElementExpression(vec![
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SignedElement::Positive(Element::Dice(Dice::new(2, 20, KeepOrDrop::Keep(1)))),
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SignedElement::Positive(Element::Bonus(5)),
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])
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))
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);
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assert_eq!(
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parse_element_expression(" - 8d4 \n "),
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Ok((
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" \n ",
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ElementExpression(vec![SignedElement::Negative(Element::Dice(Dice::new(
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8,
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4,
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KeepOrDrop::None
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)))])
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))
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);
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assert_eq!(
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parse_element_expression("\t3d4k2 + 7 - 5 - 6d12dh3 + 1d1 + 53 1d5 "),
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Ok((
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" 1d5 ",
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ElementExpression(vec![
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SignedElement::Positive(Element::Dice(Dice::new(3, 4, KeepOrDrop::Keep(2)))),
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SignedElement::Positive(Element::Bonus(7)),
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SignedElement::Negative(Element::Bonus(5)),
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SignedElement::Negative(Element::Dice(Dice::new(6, 12, KeepOrDrop::Drop(3)))),
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SignedElement::Positive(Element::Dice(Dice::new(1, 1, KeepOrDrop::None))),
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SignedElement::Positive(Element::Bonus(53)),
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])
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))
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);
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}
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}
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