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