66 lines
1.9 KiB
Rust
66 lines
1.9 KiB
Rust
#![cfg(feature = "repl")]
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use rustyline::{self, error::ReadlineError, Config, CompletionType, EditMode, hint::HistoryHinter, validate::MatchingBracketValidator, Editor};
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use complexpr::{interpreter::interpret, value::Value};
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use crate::{helper::CxprHelper, create_env};
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const C_RESET: &str = "\x1b[0m";
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const C_BLUE: &str = "\x1b[94m";
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const C_RED: &str = "\x1b[91m";
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const PROMPT: &str = "\x1b[94m>> \x1b[0m";
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pub fn repl() -> Result<(), Box<dyn std::error::Error>> {
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let config = Config::builder()
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.history_ignore_space(true)
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.completion_type(CompletionType::List)
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.edit_mode(EditMode::Emacs)
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.build();
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let env = create_env().wrap();
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let h = CxprHelper {
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hinter: HistoryHinter {},
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colored_prompt: PROMPT.to_owned(),
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validator: MatchingBracketValidator::new(),
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env: env.clone(),
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};
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let histfile = std::env::var("COMPLEXPR_HISTORY").ok();
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let mut rl = Editor::with_config(config)?;
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rl.set_helper(Some(h));
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if let Some(hf) = &histfile {
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rl.load_history(hf)?;
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}
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println!("Press {}Ctrl+D{} to exit.", C_BLUE, C_RESET);
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loop {
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let readline = rl.readline(">> ");
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match readline {
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Ok(line) => {
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rl.add_history_entry(&line);
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let result = interpret(&line, None, Some(env.clone()), true);
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match result {
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Ok(value) => {
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if value != Value::Nil {
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println!("{}", value.repr());
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}
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env.borrow_mut().declare("_".into(), value);
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}
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Err(e) => eprintln!("{}Error: {}{}", C_RED, C_RESET, e)
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}
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}
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Err(ReadlineError::Eof) => break,
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Err(_) => (),
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}
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}
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if let Some(hf) = &histfile {
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rl.save_history(hf)?
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}
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Ok(())
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}
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