356 lines
13 KiB
Rust
356 lines
13 KiB
Rust
use std::fmt::Write as FmtWrite;
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use std::io::{Read, Write};
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use std::fs::File;
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use std::sync::Arc;
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use colored::*;
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use itertools::Itertools;
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use language::{ProgrammingLanguageInterface, EvalOptions,
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PassDebugOptionsDescriptor};
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mod command_tree;
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use self::command_tree::CommandTree;
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const HISTORY_SAVE_FILE: &'static str = ".schala_history";
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const OPTIONS_SAVE_FILE: &'static str = ".schala_repl";
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pub struct Repl {
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options: EvalOptions,
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languages: Vec<Box<ProgrammingLanguageInterface>>,
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current_language_index: usize,
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interpreter_directive_sigil: char,
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line_reader: ::linefeed::interface::Interface<::linefeed::terminal::DefaultTerminal>,
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}
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impl Repl {
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pub fn new(languages: Vec<Box<ProgrammingLanguageInterface>>, initial_index: usize) -> Repl {
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use linefeed::Interface;
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let current_language_index = if initial_index < languages.len() { initial_index } else { 0 };
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let line_reader = Interface::new("schala-repl").unwrap();
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Repl {
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options: Repl::get_options(),
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languages,
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current_language_index,
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interpreter_directive_sigil: ':',
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line_reader
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}
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}
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fn get_cur_language(&self) -> &ProgrammingLanguageInterface {
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self.languages[self.current_language_index].as_ref()
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}
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fn get_options() -> EvalOptions {
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File::open(OPTIONS_SAVE_FILE)
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.and_then(|mut file| {
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let mut contents = String::new();
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file.read_to_string(&mut contents)?;
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Ok(contents)
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})
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.and_then(|contents| {
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let options: EvalOptions = ::serde_json::from_str(&contents)?;
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Ok(options)
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}).unwrap_or(EvalOptions::default())
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}
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fn save_options(&self) {
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let ref options = self.options;
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let read = File::create(OPTIONS_SAVE_FILE)
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.and_then(|mut file| {
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let buf = ::serde_json::to_string(options).unwrap();
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file.write_all(buf.as_bytes())
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});
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if let Err(err) = read {
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println!("Error saving {} file {}", OPTIONS_SAVE_FILE, err);
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}
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}
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pub fn run(&mut self) {
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use linefeed::ReadResult;
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println!("Schala MetaInterpreter version {}", ::VERSION_STRING);
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println!("Type {}help for help with the REPL", self.interpreter_directive_sigil);
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self.line_reader.load_history(HISTORY_SAVE_FILE).unwrap_or(());
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loop {
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let language_name = self.get_cur_language().get_language_name();
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let directives = self.get_directives();
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let tab_complete_handler = TabCompleteHandler::new(self.interpreter_directive_sigil, directives);
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self.line_reader.set_completer(Arc::new(tab_complete_handler));
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let prompt_str = format!("{} >> ", language_name);
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self.line_reader.set_prompt(&prompt_str).unwrap();
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match self.line_reader.read_line() {
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Err(e) => {
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println!("Terminal read error: {}", e);
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},
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Ok(ReadResult::Eof) => break,
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Ok(ReadResult::Signal(_)) => break,
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Ok(ReadResult::Input(ref input)) => {
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self.line_reader.add_history_unique(input.to_string());
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let output = match input.chars().nth(0) {
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Some(ch) if ch == self.interpreter_directive_sigil => self.handle_interpreter_directive(input),
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_ => Some(self.input_handler(input)),
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};
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if let Some(o) = output {
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println!("=> {}", o);
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}
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}
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}
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}
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self.line_reader.save_history(HISTORY_SAVE_FILE).unwrap_or(());
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self.save_options();
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println!("Exiting...");
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}
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fn input_handler(&mut self, input: &str) -> String {
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let ref mut language = self.languages[self.current_language_index];
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let interpreter_output = language.execute_pipeline(input, &self.options);
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interpreter_output.to_repl()
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}
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fn get_directives(&self) -> CommandTree {
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let ref passes = self.get_cur_language().get_passes();
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let passes_directives: Vec<CommandTree> = passes.iter()
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.map(|pass_descriptor| {
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let name = &pass_descriptor.name;
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if pass_descriptor.debug_options.len() == 0 {
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CommandTree::term(name, None)
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} else {
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let children: Vec<CommandTree> = pass_descriptor.debug_options.iter()
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.map(|o| CommandTree::term(o, None)).collect();
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CommandTree::NonTerminal {
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name: name.clone(),
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children,
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help_msg: None,
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function: None,
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}
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}
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}).collect();
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CommandTree::Top(vec![
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CommandTree::term("exit", Some("exit the REPL")),
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CommandTree::term("quit", Some("exit the REPL")),
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CommandTree::term("help", Some("Print this help message")),
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CommandTree::nonterm("debug",
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Some("show or hide pass debug info for a given pass, or display the names of all passes, or turn timing on/off"),
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vec![
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CommandTree::term("passes", None),
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CommandTree::nonterm("show", None, passes_directives.clone()),
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CommandTree::nonterm("hide", None, passes_directives.clone()),
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CommandTree::nonterm("timing", None, vec![
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CommandTree::term("on", None),
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CommandTree::term("off", None),
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])
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]
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),
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CommandTree::nonterm("lang",
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Some("switch between languages, or go directly to a langauge by name"),
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vec![
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CommandTree::term("next", None),
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CommandTree::term("prev", None),
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CommandTree::nonterm("go", None, vec![]),
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]
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),
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CommandTree::term("doc", Some("Get language-specific help for an item")),
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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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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 initial_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 initial_cmd {
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"exit" | "quit" => {
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self.save_options();
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::std::process::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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let directives = match self.get_directives() {
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CommandTree::Top(children) => children,
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_ => panic!("Top-level CommandTree not Top")
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};
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writeln!(buf, "MetaInterpreter options").unwrap();
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writeln!(buf, "-----------------------").unwrap();
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for directive in directives {
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let trailer = " ";
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writeln!(buf, "{}{}- {}", directive.get_cmd(), trailer, directive.get_help()).unwrap();
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}
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writeln!(buf, "").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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"debug" => self.handle_debug(commands),
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"doc" => self.languages[self.current_language_index]
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.get_doc(&commands)
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.or(Some(format!("No docs implemented"))),
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e => {
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self.languages[self.current_language_index]
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.handle_custom_interpreter_directives(&commands)
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.or(Some(format!("Unknown command: {}", e)))
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}
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}
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}
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fn handle_debug(&mut self, commands: Vec<&str>) -> Option<String> {
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let passes = self.get_cur_language().get_passes();
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match commands.get(1) {
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Some(&"timing") => match commands.get(2) {
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Some(&"on") => { self.options.debug_timing = true; None }
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Some(&"off") => { self.options.debug_timing = false; None }
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_ => return Some(format!(r#"Argument to "timing" must be "on" or "off""#)),
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},
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Some(&"passes") => Some(
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passes.into_iter()
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.map(|desc| {
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if self.options.debug_passes.contains_key(&desc.name) {
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let color = "green";
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format!("*{}", desc.name.color(color))
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} else {
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desc.name
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}
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})
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.intersperse(format!(" -> "))
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.collect()),
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b @ Some(&"show") | b @ Some(&"hide") => {
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let show = b == Some(&"show");
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let debug_pass: String = match commands.get(2) {
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Some(s) => s.to_string(),
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None => return Some(format!("Must specify a stage to debug")),
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};
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let pass_opt = commands.get(3);
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if let Some(desc) = passes.iter().find(|desc| desc.name == debug_pass) {
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let mut opts = vec![];
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if let Some(opt) = pass_opt {
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opts.push(opt.to_string());
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}
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let msg = format!("{} debug for pass {}", if show { "Enabling" } else { "Disabling" }, debug_pass);
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if show {
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self.options.debug_passes.insert(desc.name.clone(), PassDebugOptionsDescriptor { opts });
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} else {
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self.options.debug_passes.remove(&desc.name);
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}
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Some(msg)
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} else {
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Some(format!("Couldn't find stage: {}", debug_pass))
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}
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},
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_ => Some(format!("Unknown debug command"))
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}
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}
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}
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struct TabCompleteHandler {
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sigil: char,
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top_level_commands: CommandTree,
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}
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use linefeed::complete::{Completion, Completer};
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use linefeed::terminal::Terminal;
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impl TabCompleteHandler {
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fn new(sigil: char, top_level_commands: CommandTree) -> TabCompleteHandler {
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TabCompleteHandler {
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top_level_commands,
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sigil,
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}
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}
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}
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impl<T: Terminal> Completer<T> for TabCompleteHandler {
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fn complete(&self, word: &str, prompter: &::linefeed::prompter::Prompter<T>, start: usize, _end: usize) -> Option<Vec<Completion>> {
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let line = prompter.buffer();
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if line.starts_with(&format!("{}", self.sigil)) {
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let mut words = line[1..(if start == 0 { 1 } else { start })].split_whitespace();
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let mut completions = Vec::new();
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let mut command_tree: Option<&CommandTree> = Some(&self.top_level_commands);
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loop {
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match words.next() {
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None => {
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let top = match command_tree {
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Some(CommandTree::Top(_)) => true,
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_ => false
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};
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let word = if top { word.get(1..).unwrap() } else { word };
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for cmd in command_tree.map(|x| x.get_children()).unwrap_or(vec![]).into_iter() {
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if cmd.starts_with(word) {
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completions.push(Completion {
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completion: format!("{}{}", if top { ":" } else { "" }, cmd),
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display: Some(cmd.to_string()),
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suffix: ::linefeed::complete::Suffix::Some(' ')
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})
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}
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}
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break;
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},
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Some(s) => {
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let new_ptr: Option<&CommandTree> = command_tree.and_then(|cm| match cm {
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CommandTree::Top(children) => children.iter().find(|c| c.get_cmd() == s),
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CommandTree::NonTerminal { children, .. } => children.iter().find(|c| c.get_cmd() == s),
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CommandTree::Terminal { .. } => None,
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});
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command_tree = new_ptr;
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}
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}
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}
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Some(completions)
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} else {
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None
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}
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}
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}
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