big tings

parser/utils/set_path_value.go

@@ -0,0 +1,65 @@
+// Package utils contains utility functions for the parser package.
+package utils
+
+import (
+	"maps"
+	"strings"
+)
+
+// SetPathValue sets value at a dot-separated path in obj, creating maps as needed.
+// If the path is only dots (e.g., "." or ".."):
+//   - when obj == nil    -> returns value directly (e.g., "flour")
+//   - when obj is a map  -> if value is a map[string]any, merge into obj; otherwise obj is unchanged.
+//   - otherwise          -> returns obj unchanged.
+func SetPathValue(path string, value any, obj any) any {
+	// Split and drop empty segments (so ".", "..", "" become no keys)
+	raw := strings.Split(path, ".")
+	keys := raw[:0]
+	for _, k := range raw {
+		if k != "" {
+			keys = append(keys, k)
+		}
+	}
+
+	// Root case: no keys after trimming dots
+	if len(keys) == 0 {
+		if obj == nil {
+			return value
+		}
+		if m, ok := obj.(map[string]any); ok {
+			if mv, ok := value.(map[string]any); ok {
+				maps.Copy(m, mv)
+			}
+			return m
+		}
+		return obj
+	}
+
+	// Ensure root is a map
+	var root map[string]any
+	if obj == nil {
+		root = map[string]any{}
+	} else if m, ok := obj.(map[string]any); ok {
+		root = m
+	} else {
+		// if obj is not a map, just overwrite it with a new map
+		root = map[string]any{}
+	}
+
+	// Descend/construct maps
+	curr := root
+	for i, k := range keys {
+		if i == len(keys)-1 {
+			curr[k] = value
+			break
+		}
+		if next, ok := curr[k].(map[string]any); ok {
+			curr = next
+			continue
+		}
+		n := map[string]any{}
+		curr[k] = n
+		curr = n
+	}
+	return root
+}