134 lines
3.5 KiB
Rust
134 lines
3.5 KiB
Rust
use crate::context::Context;
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use crate::error::{BotError, BotError::CommandParsingError};
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use async_trait::async_trait;
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use parser::CommandParsingError::UnrecognizedCommand;
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use thiserror::Error;
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pub mod basic_rolling;
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pub mod cofd;
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pub mod cthulhu;
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pub mod misc;
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pub mod parser;
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pub mod variables;
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#[derive(Error, Debug)]
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pub enum CommandError {
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#[error("invalid command: {0}")]
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InvalidCommand(String),
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#[error("ignored command")]
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IgnoredCommand,
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}
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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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#[async_trait]
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pub trait Command: Send + Sync {
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async fn execute(&self, ctx: &Context<'_>) -> Execution;
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fn name(&self) -> &'static str;
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}
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/// Parse a command string into a dynamic command execution trait
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/// object. Returns an error if a command was recognized but not
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/// parsed correctly. Returns IgnoredCommand error if no command was
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/// recognized.
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pub fn parse(s: &str) -> Result<Box<dyn Command>, BotError> {
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match parser::parse_command(s) {
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Ok(command) => Ok(command),
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Err(CommandParsingError(UnrecognizedCommand(_))) => {
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Err(CommandError::IgnoredCommand.into())
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}
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Err(e) => Err(e),
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}
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}
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pub struct CommandResult {
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pub plain: String,
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pub html: String,
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}
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/// Attempt to execute a command, and return the content that should
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/// go back to Matrix, if the command was executed (successfully or
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/// not). If a command is determined to be ignored, this function will
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/// return None, signifying that we should not send a response.
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pub async fn execute_command(ctx: &Context<'_>) -> Option<CommandResult> {
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let res = parse(&ctx.message_body);
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let (plain, html) = match res {
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Ok(cmd) => {
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let execution = cmd.execute(ctx).await;
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(execution.plain().into(), execution.html().into())
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}
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Err(BotError::CommandError(CommandError::IgnoredCommand)) => return None,
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Err(e) => {
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let message = format!("Error parsing command: {}", e);
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let html_message = format!("<p><strong>{}</strong></p>", message);
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(message, html_message)
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}
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};
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let plain = format!("{}\n{}", ctx.username, plain);
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let html = format!("<p>{}</p>\n{}", ctx.username, html);
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Some(CommandResult {
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plain: plain,
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html: html,
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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("!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("!roll 1d20asdlfkj").is_err());
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assert!(parse("!roll 1d20asdlfkj ").is_err());
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}
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#[test]
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fn roll_dice_pool_malformed_expression_test() {
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assert!(parse("!pool 8abc").is_err());
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assert!(parse("!pool 8abc ").is_err());
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}
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#[test]
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fn pool_whitespace_test() {
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parse("!pool ns3:8 ").expect("was error");
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parse(" !pool ns3:8").expect("was error");
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parse(" !pool ns3:8 ").expect("was error");
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}
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#[test]
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fn help_whitespace_test() {
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parse("!help stuff ").expect("was error");
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parse(" !help stuff").expect("was error");
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parse(" !help stuff ").expect("was error");
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}
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#[test]
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fn roll_whitespace_test() {
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parse("!roll 1d4 + 5d6 -3 ").expect("was error");
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parse("!roll 1d4 + 5d6 -3 ").expect("was error");
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parse(" !roll 1d4 + 5d6 -3 ").expect("was error");
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}
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}
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