117 lines
3.8 KiB
Rust
117 lines
3.8 KiB
Rust
use crate::cofd::parser::{create_chance_die, parse_dice_pool};
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use crate::commands::{Command, HelpCommand, PoolRollCommand, RollCommand};
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use crate::dice::parser::parse_element_expression;
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use crate::help::parse_help_topic;
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use crate::parser::{eat_whitespace, trim};
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use nom::{bytes::complete::tag, character::complete::alpha1, IResult};
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// Parse a roll expression.
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fn parse_roll(input: &str) -> IResult<&str, Box<dyn Command>> {
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let (input, _) = eat_whitespace(input)?;
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let (input, expression) = parse_element_expression(input)?;
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Ok((input, Box::new(RollCommand(expression))))
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}
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fn parse_pool_roll(input: &str) -> IResult<&str, Box<dyn Command>> {
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let (input, _) = eat_whitespace(input)?;
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let (input, pool) = parse_dice_pool(input)?;
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Ok((input, Box::new(PoolRollCommand(pool))))
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}
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fn chance_die() -> IResult<&'static str, Box<dyn Command>> {
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let (input, pool) = create_chance_die()?;
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Ok((input, Box::new(PoolRollCommand(pool))))
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}
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fn help(topic: &str) -> IResult<&str, Box<dyn Command>> {
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let (topic, _) = eat_whitespace(topic)?;
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let topic = parse_help_topic(&trim(topic));
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Ok(("", Box::new(HelpCommand(topic))))
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}
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/// Split an input string into its constituent command and "everything
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/// else" parts. Extracts the command separately from its input (i.e.
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/// rest of the line) and returns a tuple of (command_input, command).
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fn split_command(input: &str) -> IResult<&str, &str> {
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let (input, _) = eat_whitespace(input)?;
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let (input, _) = tag("!")(input)?;
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let (command_input, command) = alpha1(input)?;
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let (command_input, _) = eat_whitespace(command_input)?;
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//TODO strip witespace from end of command input
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Ok((command_input, command))
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}
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/// Potentially parse a command expression. If we recognize the
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/// command, an error should be raised if the command is misparsed. If
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/// we don't recognize the command, ignore it and return none
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pub fn parse_command(input: &str) -> IResult<&str, Option<Box<dyn Command>>> {
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let (cmd_input, cmd) = split_command(input)?;
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match cmd {
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"r" | "roll" => parse_roll(cmd_input).map(|(input, command)| (input, Some(command))),
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"rp" | "pool" => parse_pool_roll(cmd_input).map(|(input, command)| (input, Some(command))),
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"chance" => chance_die().map(|(input, command)| (input, Some(command))),
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"help" => help(cmd_input).map(|(input, command)| (input, Some(command))),
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// No recognized command, ignore this.
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_ => Ok((input, None)),
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}
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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 basic_command_test() {
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assert_eq!(
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("1d4", "roll"),
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split_command("!roll 1d4").expect("got parsing error")
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);
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}
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#[test]
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fn whitespace_at_start_test() {
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assert_eq!(
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("1d4", "roll"),
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split_command(" !roll 1d4").expect("got parsing error")
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);
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}
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#[test]
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fn whitespace_at_end_test() {
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//TODO currently it does not chop whitespace off the end.
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assert_eq!(
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("1d4 ", "roll"),
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split_command("!roll 1d4 ").expect("got parsing error")
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);
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}
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#[test]
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fn whitespace_on_both_ends_test() {
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//TODO currently it does not chop whitespace off the end.
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assert_eq!(
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("1d4 ", "roll"),
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split_command(" !roll 1d4 ").expect("got parsing error")
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);
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}
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#[test]
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fn single_command_test() {
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assert_eq!(
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("", "roll"),
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split_command("!roll").expect("got parsing error")
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);
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assert_eq!(
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("", "thisdoesnotexist"),
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split_command("!thisdoesnotexist").expect("got parsing error")
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);
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}
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#[test]
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fn bad_command_test() {
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assert!(split_command("roll 1d4").is_err());
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assert!(split_command("roll").is_err());
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}
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}
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