Start refactoring how interpreter options are split up
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TODO.md
2
TODO.md
@ -7,7 +7,7 @@
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* change 'trait' to 'interface'
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-think about idris-related ideas of multiple implementations of a type for an interface (+ vs * impl for monoids)
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-think about idris-related ideas of multiple implementations of a type for an interface (+ vs * impl for monoids, for preorder/inorder/postorder for Foldable)
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* Share state between programming languages
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@ -170,4 +170,10 @@ pub trait ProgrammingLanguageInterface {
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}
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fn get_language_name(&self) -> String;
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fn get_source_file_suffix(&self) -> String;
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fn handle_custom_interpreter_directives(&mut self, commands: &Vec<&str>) -> Option<String> {
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None
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}
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fn custom_interpreter_directives_help(&self) -> String {
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format!(">> No custom interpreter directives specified <<")
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}
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}
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@ -214,6 +214,74 @@ impl Repl {
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interpreter_output.to_repl()
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}
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fn handle_interpreter_directive(&mut self, input: &str) -> Option<String> {
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let mut iter = input.chars();
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iter.next();
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let commands: Vec<&str> = iter
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.as_str()
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.split_whitespace()
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.collect();
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let cmd: &str = match commands.get(0).clone() {
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None => return None,
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Some(s) => s
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};
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match cmd {
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"exit" | "quit" => {
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self.save_options();
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exit(0)
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},
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"lang" | "language" => match commands.get(1) {
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Some(&"show") => {
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let mut buf = String::new();
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for (i, lang) in self.languages.iter().enumerate() {
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write!(buf, "{}{}\n", if i == self.current_language_index { "* "} else { "" }, lang.get_language_name()).unwrap();
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}
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Some(buf)
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},
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Some(&"go") => match commands.get(2) {
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None => Some(format!("Must specify a language name")),
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Some(&desired_name) => {
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for (i, _) in self.languages.iter().enumerate() {
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let lang_name = self.languages[i].get_language_name();
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if lang_name.to_lowercase() == desired_name.to_lowercase() {
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self.current_language_index = i;
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return Some(format!("Switching to {}", self.languages[self.current_language_index].get_language_name()));
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}
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}
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Some(format!("Language {} not found", desired_name))
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}
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},
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Some(&"next") | Some(&"n") => {
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self.current_language_index = (self.current_language_index + 1) % self.languages.len();
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Some(format!("Switching to {}", self.languages[self.current_language_index].get_language_name()))
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},
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Some(&"previous") | Some(&"p") | Some(&"prev") => {
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self.current_language_index = if self.current_language_index == 0 { self.languages.len() - 1 } else { self.current_language_index - 1 };
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Some(format!("Switching to {}", self.languages[self.current_language_index].get_language_name()))
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},
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Some(e) => Some(format!("Bad `lang(uage)` argument: {}", e)),
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None => Some(format!("Valid arguments for `lang(uage)` are `show`, `next`|`n`, `previous`|`prev`|`n`"))
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},
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"help" => {
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let mut buf = String::new();
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let ref lang = self.languages[self.current_language_index];
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writeln!(buf, "MetaInterpreter options").unwrap();
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writeln!(buf, "-----------------------").unwrap();
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writeln!(buf, "exit | quit - exit the REPL").unwrap();
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writeln!(buf, "lang [prev|next|go <name> |show] - toggle to previous or next language, go to a specific language by name, or show all languages").unwrap();
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writeln!(buf, "Language-specific help for {}", lang.get_language_name()).unwrap();
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writeln!(buf, "-----------------------").unwrap();
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writeln!(buf, "{}", lang.custom_interpreter_directives_help()).unwrap();
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Some(buf)
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},
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_ => self.languages[self.current_language_index].handle_custom_interpreter_directives(&commands),
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}
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}
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/*
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fn handle_interpreter_directive(&mut self, input: &str) -> Option<String> {
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let mut iter = input.chars();
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iter.next();
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@ -309,6 +377,7 @@ tokens: {}, parse: {}, ast: {}, symbols: {}"#, tokens, parse_tree, ast, symbol_t
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e => Some(format!("Unknown command: {}", e))
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}
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}
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*/
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}
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/*
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