feat: renderer

renderer/codec/yaml.go

@@ -0,0 +1,83 @@
+package codec
+
+import (
+	"fmt"
+	"strings"
+
+	parserUtils "git.max-richter.dev/max/marka/parser/utils"
+	"git.max-richter.dev/max/marka/renderer/utils"
+	"git.max-richter.dev/max/marka/template"
+
+	"go.yaml.in/yaml/v4"
+)
+
+func flattenInto(in map[string]any) map[string]any {
+	out := make(map[string]any)
+
+	var recur func(prefix string, m map[string]any)
+	recur = func(prefix string, m map[string]any) {
+		for k, v := range m {
+			key := k
+			if prefix != "" {
+				key = prefix + "." + k
+			}
+
+			switch vv := v.(type) {
+			case map[string]any:
+				if len(vv) == 1 {
+					recur(key, vv)
+				} else {
+					out[key] = vv
+				}
+			case map[any]any:
+				tmp := make(map[string]any, len(vv))
+				for kk, vv2 := range vv {
+					if ks, ok := kk.(string); ok {
+						tmp[ks] = vv2
+					}
+				}
+				if len(tmp) == 1 {
+					recur(key, tmp)
+				} else {
+					out[key] = tmp
+				}
+			default:
+				out[key] = v
+			}
+		}
+	}
+
+	recur("", in)
+	return out
+}
+
+func RenderYaml(data map[string]any, block template.Block) (string, error) {
+	renderedMap := make(map[string]any)
+	for _, field := range block.Fields {
+		if field.Hidden {
+			continue
+		}
+
+		var fieldValue any
+		var found bool
+
+		if field.CodecType == template.CodecConst {
+			fieldValue = field.Value
+			found = true
+		} else {
+			fieldValue, found = utils.GetValueFromPath(data, field.Path)
+		}
+
+		if found {
+			renderedMap = parserUtils.SetPathValue(field.Path, fieldValue, renderedMap).(map[string]any)
+		}
+	}
+
+	renderedMap = flattenInto(renderedMap)
+
+	b, err := yaml.Marshal(renderedMap)
+	if err != nil {
+		return "", fmt.Errorf("failed to marshal YAML for path '%s': %w", block.Path, err)
+	}
+	return strings.TrimSuffix(string(b), "\n"), nil
+}