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Improvments to interpreter directives parsing

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This commit is contained in:
greg 2017-01-13 17:53:23 -08:00
parent d7181afa91
commit 1f50fcc620
1 changed files with 31 additions and 36 deletions
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67
src/main.rs
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@ -89,7 +89,6 @@ type LineReader = linefeed::Reader<linefeed::terminal::DefaultTerminal>;
struct Repl<'a> {
show_tokens: bool,
show_parse: bool,
show_eval: bool,
evaluator: Evaluator<'a>,
interpreter_directive_sigil: char,
reader: LineReader,
@ -102,7 +101,6 @@ impl<'a> Repl<'a> {
Repl {
show_tokens: false,
show_parse: false,
show_eval: false,
evaluator: Evaluator::new_with_opts(None, trace_evaluation),
interpreter_directive_sigil: '.',
reader: reader,
@ -168,50 +166,47 @@ impl<'a> Repl<'a> {
_ => return false
}
let trimmed_sigil: String = input.chars()
.skip(1)
.collect();
let mut iter = input.chars();
iter.next();
let trimmed_sigil: &str = iter.as_str();
let commands: Vec<&str> = trimmed_sigil
.split_whitespace()
.collect();
let cmd: &str = match commands.get(0).clone() { None => return true, Some(s) => s };
let cmd: &str = match commands.get(0).clone() {
None => return true,
Some(s) => s
};
match cmd {
"exit" | "quit" => process::exit(0),
"history" => {
},
"output_history" => {
},
_ => {
self.update_state(&commands);
for item in self.reader.history() {
println!("{}", item);
}
},
"set" => {
let show = match commands[1] {
"show" => true,
"hide" => false,
e => {
println!("Bad `set` argument: {}", e);
return true;
}
};
match commands[2] {
"tokens" => self.show_tokens = show,
"parse" => self.show_parse = show,
"eval" => self.evaluator.trace_evaluation = show,
e => {
println!("Bad `show`/`hide` argument: {}", e);
return true;
}
}
},
_ => (),
}
return true;
}
fn update_state(&mut self, input: &Vec<&str>) {
match input[..] {
["set", "show", "tokens", "true"] => {
self.show_tokens = true;
}
["set", "show", "tokens", "false"] => {
self.show_tokens = false;
}
["set", "show", "parse", "true"] => {
self.show_parse = true;
}
["set", "show", "parse", "false"] => {
self.show_parse = false;
}
["set", "show", "eval", "true"] => {
self.evaluator.trace_evaluation = true;
}
["set", "show", "eval", "false"] => {
self.evaluator.trace_evaluation = false;
}
_ => (),
}
}
}