feat(gitlab-sim): ✨ first commit

internal/model/parser.go

@@ -0,0 +1,50 @@
+package model
+
+import (
+	"fmt"
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+// Parse reads a .gitlab-ci.yml file and returns a Pipeline.
+func Parse(path string) (*Pipeline, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("reading file: %w", err)
+	}
+
+	// First pass: decode into a raw map to extract job keys.
+	var raw map[string]yaml.Node
+	if err := yaml.Unmarshal(data, &raw); err != nil {
+		return nil, fmt.Errorf("parsing YAML: %w", err)
+	}
+
+	// Second pass: decode known top-level fields into Pipeline.
+	p := &Pipeline{}
+	if err := yaml.Unmarshal(data, p); err != nil {
+		return nil, fmt.Errorf("parsing pipeline structure: %w", err)
+	}
+
+	p.Jobs = make(map[string]Job)
+	p.RawJobs = make(map[string]map[string]any)
+	for key, node := range raw {
+		if ReservedKeys[key] {
+			continue
+		}
+		var rawMap map[string]any
+		if err := node.Decode(&rawMap); err != nil {
+			return nil, fmt.Errorf("parsing raw job %q: %w", key, err)
+		}
+		p.RawJobs[key] = rawMap
+
+		var j Job
+		if err := node.Decode(&j); err != nil {
+			return nil, fmt.Errorf("parsing job %q: %w", key, err)
+		}
+		j.Name = key
+		p.Jobs[key] = j
+	}
+
+	return p, nil
+}