30 lines
1.1 KiB
Rust
30 lines
1.1 KiB
Rust
use std::{cell::RefCell, rc::Rc};
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use crate::{value::Value, lexer::Lexer, parser::Parser, eval::{eval_stmt, eval_expr}, expr::Stmt, env::{EnvRef, Environment}};
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pub fn interpret(src: &str, fname: Option<String>, env: Option<EnvRef>, repl: bool) -> Result<Value, Box<dyn std::error::Error>> {
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let ctx_name = if repl { "<interactive input>" } else { fname.as_ref().map(|s| s.as_ref()).unwrap_or("<unknown>") };
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let mut lexer = Lexer::new(src, fname.clone());
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lexer.lex()?;
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let tokens = lexer.into_tokens();
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let mut parser = Parser::new(tokens);
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let ast = parser.parse()?;
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let environ;
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if let Some(env) = env {
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environ = env;
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} else {
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environ = Rc::new(RefCell::new(Environment::new()));
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}
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let mut result = Value::Nil;
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for stmt in ast {
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if let Stmt::Expr{expr} = stmt {
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result = eval_expr(&expr, environ.clone()).map_err(|e| e.finish(Some(Rc::from(ctx_name))))?;
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} else {
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eval_stmt(&stmt, environ.clone()).map_err(|e| e.as_error().finish(Some(Rc::from(ctx_name))))?;
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result = Value::Nil;
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}
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}
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Ok(result)
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}
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