implements read_fle, std -> runtime

crates/codegen/src/ts.rs

@@ -60,7 +60,8 @@ impl Codegen {
                 match name.as_str() {
                     "write"      => { format!("write({}){}\n"        , self.gen_ir(&args[0], false), semicolon!()) },
                     "write_file" => { format!("writeFile({}, {}){}\n", self.gen_ir(&args[0], false), self.gen_ir(&args[1], false), semicolon!()) },
-                    "read" => { todo!() },
+                    "read"       => { format!("read({}){}\n"         , self.gen_ir(&args[0], false), semicolon!()) },
+                    "read_file"  => { format!("readFile({}){}\n"     , self.gen_ir(&args[0], false), semicolon!()) }
                     "emit" => { format!("{}", self.gen_ir(&args[0], false).trim_start_matches('"').trim_end_matches('"')) }, 
                     _ => unreachable!(format!("Unknown intrinsic: {}", name)) // Shoul be handled by lowering
                 }

crates/hir/src/lib.rs

@@ -1,10 +1,11 @@
 use std::ops::Range;
 use parser::Expr;
 
-const INTRINSICS: [&str; 4] = [
+const INTRINSICS: [&str; 5] = [
     "write",
     "read",
     "write_file",
+    "read_file",
     "emit",
 ];
 

runtime/io.ts

@@ -9,6 +9,16 @@ export function write(text: any): void {
     writeAllSync(Deno.stdout, bytes);
 }
 
+/**
+ * Read text from the stdin stream.
+ * @param prompt_str The prompt string to display.
+ * @returns The text read from the stdin stream.
+ */
+export function read(prompt_str: string): string {
+    const input = prompt(prompt_str, "");
+    return input ? input : "";
+}
+
 /**
  * Writes text to the file.
  * @param text The text to write. Can be any type.
@@ -18,3 +28,14 @@ export function writeFile(text: any, path: string): void {
     const bytes: Uint8Array = new TextEncoder().encode(text);
     Deno.writeFileSync(path, bytes);
 }
+
+/**
+ * Read text from the file.
+ * @param path The path to the file.
+ * @returns The text read from the file.
+ */
+export function readFile(path: string): string {
+    const decoder = new TextDecoder("utf-8");
+    const text = decoder.decode(Deno.readFileSync(path));
+    return text;
+}