Implement functions, arrays, maps, and while loops. Document and clean up code.

defaults.go

@@ -20,6 +20,7 @@ import (
 	"strconv"
 )
 
+// Default function to convert unnamed argument to a string using fmt.Sprint
 func toString(args map[string]interface{}) (interface{}, error) {
 	val, ok := args[""]
 	if !ok {
@@ -28,6 +29,7 @@ func toString(args map[string]interface{}) (interface{}, error) {
 	return fmt.Sprint(val), nil
 }
 
+// Default function to parse unnamed argument to a number using strconv.ParseFloat
 func parseNumber(args map[string]interface{}) (interface{}, error) {
 	val, ok := args[""].(string)
 	if !ok {
@@ -36,10 +38,44 @@ func parseNumber(args map[string]interface{}) (interface{}, error) {
 	return strconv.ParseFloat(val, 64)
 }
 
+// Default function to parse unnamed argument to a boolean using strconv.ParseBool
 func parseBool(args map[string]interface{}) (interface{}, error) {
 	val, ok := args[""].(string)
 	if !ok {
 		return nil, errors.New("no value provided")
 	}
 	return strconv.ParseBool(val)
-}
+}
+
+// Default function to set the breakLoop variable to true, breaking any loops that may be running
+func setBreakLoop(_ map[string]interface{}) (interface{}, error) {
+	// If a loop is running
+	if loopRunning {
+		// Set breakLoop to true, breaking the loop on next cycle
+		breakLoop = true
+	} else {
+		return nil, errors.New("break not inside loop")
+	}
+	return nil, nil
+}
+
+// Default function that returns an array with an appended element
+func appendArray(args map[string]interface{}) (interface{}, error) {
+	// Attempt to get unnamed argument and assert as []interface{}
+	val, ok := args[""].([]interface{})
+	if !ok {
+		return nil, errors.New("cannot append to non-array object")
+	}
+	// Attempt to get items argument and assert as []interface{}
+	items, ok := args["items"].([]interface{})
+	if !ok {
+		return nil, errors.New("items argument invalid or not provided")
+	}
+	// For every item in items argument
+	for _, item := range items {
+		// Append to unnamed argument
+		val = append(val, item)
+	}
+	// Return appended unnamed argument
+	return val, nil
+}