Start refactoring how interpreter options are split up

This commit is contained in:
greg 2018-04-23 21:33:15 -07:00
parent 748250d383
commit 5fcf0815c0
3 changed files with 76 additions and 1 deletions

View File

@ -7,7 +7,7 @@
* change 'trait' to 'interface'
-think about idris-related ideas of multiple implementations of a type for an interface (+ vs * impl for monoids)
-think about idris-related ideas of multiple implementations of a type for an interface (+ vs * impl for monoids, for preorder/inorder/postorder for Foldable)
* Share state between programming languages

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@ -170,4 +170,10 @@ pub trait ProgrammingLanguageInterface {
}
fn get_language_name(&self) -> String;
fn get_source_file_suffix(&self) -> String;
fn handle_custom_interpreter_directives(&mut self, commands: &Vec<&str>) -> Option<String> {
None
}
fn custom_interpreter_directives_help(&self) -> String {
format!(">> No custom interpreter directives specified <<")
}
}

View File

@ -214,6 +214,74 @@ impl Repl {
interpreter_output.to_repl()
}
fn handle_interpreter_directive(&mut self, input: &str) -> Option<String> {
let mut iter = input.chars();
iter.next();
let commands: Vec<&str> = iter
.as_str()
.split_whitespace()
.collect();
let cmd: &str = match commands.get(0).clone() {
None => return None,
Some(s) => s
};
match cmd {
"exit" | "quit" => {
self.save_options();
exit(0)
},
"lang" | "language" => match commands.get(1) {
Some(&"show") => {
let mut buf = String::new();
for (i, lang) in self.languages.iter().enumerate() {
write!(buf, "{}{}\n", if i == self.current_language_index { "* "} else { "" }, lang.get_language_name()).unwrap();
}
Some(buf)
},
Some(&"go") => match commands.get(2) {
None => Some(format!("Must specify a language name")),
Some(&desired_name) => {
for (i, _) in self.languages.iter().enumerate() {
let lang_name = self.languages[i].get_language_name();
if lang_name.to_lowercase() == desired_name.to_lowercase() {
self.current_language_index = i;
return Some(format!("Switching to {}", self.languages[self.current_language_index].get_language_name()));
}
}
Some(format!("Language {} not found", desired_name))
}
},
Some(&"next") | Some(&"n") => {
self.current_language_index = (self.current_language_index + 1) % self.languages.len();
Some(format!("Switching to {}", self.languages[self.current_language_index].get_language_name()))
},
Some(&"previous") | Some(&"p") | Some(&"prev") => {
self.current_language_index = if self.current_language_index == 0 { self.languages.len() - 1 } else { self.current_language_index - 1 };
Some(format!("Switching to {}", self.languages[self.current_language_index].get_language_name()))
},
Some(e) => Some(format!("Bad `lang(uage)` argument: {}", e)),
None => Some(format!("Valid arguments for `lang(uage)` are `show`, `next`|`n`, `previous`|`prev`|`n`"))
},
"help" => {
let mut buf = String::new();
let ref lang = self.languages[self.current_language_index];
writeln!(buf, "MetaInterpreter options").unwrap();
writeln!(buf, "-----------------------").unwrap();
writeln!(buf, "exit | quit - exit the REPL").unwrap();
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();
writeln!(buf, "Language-specific help for {}", lang.get_language_name()).unwrap();
writeln!(buf, "-----------------------").unwrap();
writeln!(buf, "{}", lang.custom_interpreter_directives_help()).unwrap();
Some(buf)
},
_ => self.languages[self.current_language_index].handle_custom_interpreter_directives(&commands),
}
}
/*
fn handle_interpreter_directive(&mut self, input: &str) -> Option<String> {
let mut iter = input.chars();
iter.next();
@ -309,6 +377,7 @@ tokens: {}, parse: {}, ast: {}, symbols: {}"#, tokens, parse_tree, ast, symbol_t
e => Some(format!("Unknown command: {}", e))
}
}
*/
}
/*