Initial commit

Author: returnString

.gitignore

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+/target
+**/*.rs.bk

.vscode/settings.json

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+{
+	"files.exclude": {
+		"**/target": true
+	}
+}

Cargo.lock

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+[package]
+name = "qry"
+version = "0.1.0"
+authors = ["Ruan Pearce-Authers <[email protected]>"]
+edition = "2018"
+
+[dependencies]
+peg = "0.6.2"
+rustyline = "6.1.2"
+
+[[bin]]
+name = "qry"
+path = "src/cli/main.rs"

Cargo.toml

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+nightly-1.45

rust-toolchain

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+use qry::lang::parse;
+use qry::runtime::{eval, InterpreterState};
+use rustyline::error::ReadlineError;
+use rustyline::Editor;
+
+fn main() {
+	let mut rl = Editor::<()>::new();
+	let mut state = InterpreterState::new();
+
+	loop {
+		match rl.readline("qry> ") {
+			Ok(line) => match parse(&line) {
+				Ok(syntax) => match eval(&mut state, &syntax) {
+					Ok(value) => println!("{:?}", value),
+					Err(err) => println!("interpreter error: {:?}", err),
+				},
+				Err(err) => println!("parser error {:?}", err),
+			},
+			Err(ReadlineError::Interrupted) | Err(ReadlineError::Eof) => break,
+			Err(err) => {
+				println!("error {:?}", err);
+				break;
+			}
+		}
+	}
+}

src/cli/main.rs

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+pub mod parser;
+pub mod syntax;
+
+pub use parser::*;
+pub use syntax::*;