add json and file read

src/file.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"bytes"
+	"io"
+	"os"
+)
+
+var ArFile = ArMap{
+	"read": builtinFunc{"read", ArRead},
+}
+
+func readtext(file *os.File) (string, error) {
+	var buf bytes.Buffer
+	_, err := io.Copy(&buf, file)
+	if err != nil {
+		return "", err
+	}
+	return string(buf.Bytes()), nil
+}
+
+func ArRead(args ...any) (any, ArErr) {
+	if len(args) == 0 {
+		return ArMap{}, ArErr{TYPE: "Runtime Error", message: "open takes 1 argument", EXISTS: true}
+	}
+	if typeof(args[0]) != "string" {
+		return ArMap{}, ArErr{TYPE: "Runtime Error", message: "open takes a string not a '" + typeof(args[0]) + "'", EXISTS: true}
+	}
+	filename := args[0].(string)
+	file, err := os.Open(filename)
+	if err != nil {
+		return ArMap{}, ArErr{TYPE: "Runtime Error", message: err.Error(), EXISTS: true}
+	}
+	return ArMap{
+		"text": builtinFunc{"text", func(...any) (any, ArErr) {
+			text, err := readtext(file)
+			if err != nil {
+				return ArMap{}, ArErr{TYPE: "Runtime Error", message: err.Error(), EXISTS: true}
+			}
+			return text, ArErr{}
+		}},
+		"json": builtinFunc{"json", func(...any) (any, ArErr) {
+			text, err := readtext(file)
+			if err != nil {
+				return ArMap{}, ArErr{TYPE: "Runtime Error", message: err.Error(), EXISTS: true}
+			}
+			return parse(text), ArErr{}
+		}},
+		"line": builtinFunc{"line", func(...any) (any, ArErr) {
+
+			return "", ArErr{}
+		}},
+	}, ArErr{}
+}