tenebrous-dicebot/src/commands.rs

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Rust
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use crate::cofd::dice::DicePool;
use crate::dice::ElementExpression;
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use crate::roll::Roll;
pub mod parser;
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pub struct Execution {
plain: String,
html: String,
}
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impl Execution {
pub fn plain(&self) -> &str {
&self.plain
}
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pub fn html(&self) -> &str {
&self.html
}
}
pub trait Command {
fn execute(&self) -> Execution;
fn name(&self) -> &'static str;
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}
pub struct RollCommand(ElementExpression);
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impl Command for RollCommand {
fn name(&self) -> &'static str {
"roll regular dice"
}
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fn execute(&self) -> Execution {
let roll = self.0.roll();
let plain = format!("Dice: {}\nResult: {}", self.0, roll);
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let html = format!(
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"<p><strong>Dice:</strong> {}</p><p><strong>Result</strong>: {}</p>",
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self.0, roll
);
Execution { plain, html }
}
}
pub struct PoolRollCommand(DicePool);
impl Command for PoolRollCommand {
fn name(&self) -> &'static str {
"roll dice pool"
}
fn execute(&self) -> Execution {
let roll = self.0.roll();
let plain = format!("Pool: {}\nResult: {}", self.0, roll);
let html = format!(
"<p><strong>Pool:</strong> {}</p><p><strong>Result</strong>: {}</p>",
self.0, roll
);
Execution { plain, html }
}
}
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/// Parse a command string into a dynamic command execution trait object.
/// Returns an error if a command was recognized but not parsed correctly. Returns None if no
/// command was recognized.
pub fn parse_command(s: &str) -> Result<Option<Box<dyn Command>>, String> {
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match parser::parse_command(s) {
//The first clause prevents bot from spamming messages to itself
//after executing a previous command.
Ok((input, result)) => match (input, &result) {
("", Some(_)) | (_, None) => Ok(result),
_ => Err(format!("{}: malformed dice expression", s)),
},
Err(err) => Err(err.to_string()),
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn chance_die_is_not_malformed() {
assert!(parse_command("!chance").is_ok());
}
#[test]
fn roll_malformed_expression_test() {
assert!(parse_command("!roll 1d20asdlfkj").is_err());
}
#[test]
fn roll_dice_pool_expression_test() {
assert!(parse_command("!pool 8abc").is_err());
}
}