73 lines
2.5 KiB
Rust
73 lines
2.5 KiB
Rust
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use std::collections::BTreeMap;
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use std::error::Error;
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use std::fmt;
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use toml::Table;
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use modules::Module;
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use modules::discord::DiscordModule;
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use modules::lua::LuaModule;
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use modules::stdin::StdinModule;
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use modules::echo::EchoModule;
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pub struct ModuleLoader {
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types: BTreeMap<&'static str, fn(&Table) -> Box<Module>>
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}
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impl ModuleLoader {
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pub fn new () -> ModuleLoader {
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let mut types = BTreeMap::new();
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types.insert("discord", DiscordModule::new as fn(&Table) -> Box<Module>);
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types.insert("lua", LuaModule::new as fn(&Table) -> Box<Module>);
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types.insert("stdin", StdinModule::new as fn(&Table) -> Box<Module>);
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types.insert("echo", EchoModule::new as fn(&Table) -> Box<Module>);
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ModuleLoader {
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types: types
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}
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}
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pub fn load_from_configuration (&self, configuration: Table) -> Result<BTreeMap<String, Box<Module>>, ModuleLoaderError> {
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configuration.into_iter().map(|(key, value)| {
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match value.as_table() {
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Some(table) => {
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let module = self.load_single_module(&key, table)?;
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Result::Ok((key, module))
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},
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None => Result::Err(ModuleLoaderError { message: format!("Bad configuration parameters for module instance: {}. Configuration for a Module must be a table.", key) })
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}
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}).collect()
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}
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pub fn load_single_module (&self, name: &str, configuration: &Table) -> Result<Box<Module>, ModuleLoaderError> {
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/*
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* The Module type defaults to the instance name (in the tenquestionmarks configuration)
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* but can explicitly be set by using the special "type" parameter.
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*/
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let module_type: &str = configuration.get("type")
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.and_then(|value| value.as_str())
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.unwrap_or(name);
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match self.types.get(module_type) {
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Some(constructor) => Result::Ok(constructor(configuration)),
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None => Result::Err(ModuleLoaderError { message: format!("No such module type: {}", module_type) })
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}
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}
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}
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#[derive(Debug)]
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pub struct ModuleLoaderError {
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message: String
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}
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impl Error for ModuleLoaderError {
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fn description(&self) -> &str {
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&self.message[..]
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}
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}
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impl fmt::Display for ModuleLoaderError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "ModuleLoaderError: {}", self.message)
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}
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}
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