1 files changed, 118 insertions, 0 deletions
diff --git a/bp2build/conversion.go b/bp2build/conversion.go
new file mode 100644
index 000000000..cdfb38b14
--- /dev/null
+++ b/bp2build/conversion.go
@@ -0,0 +1,118 @@
+package bp2build
+
+import (
+	"android/soong/android"
+	"reflect"
+	"sort"
+	"strings"
+
+	"github.com/google/blueprint/proptools"
+)
+
+type BazelFile struct {
+	Dir      string
+	Basename string
+	Contents string
+}
+
+func CreateBazelFiles(
+	ruleShims map[string]RuleShim,
+	buildToTargets map[string][]BazelTarget) []BazelFile {
+	files := make([]BazelFile, 0, len(ruleShims)+len(buildToTargets)+numAdditionalFiles)
+
+	// Write top level files: WORKSPACE and BUILD. These files are empty.
+	files = append(files, newFile("", "WORKSPACE", ""))
+	// Used to denote that the top level directory is a package.
+	files = append(files, newFile("", "BUILD", ""))
+
+	files = append(files, newFile(bazelRulesSubDir, "BUILD", ""))
+	files = append(files, newFile(bazelRulesSubDir, "providers.bzl", providersBzl))
+
+	for bzlFileName, ruleShim := range ruleShims {
+		files = append(files, newFile(bazelRulesSubDir, bzlFileName+".bzl", ruleShim.content))
+	}
+	files = append(files, newFile(bazelRulesSubDir, "soong_module.bzl", generateSoongModuleBzl(ruleShims)))
+
+	files = append(files, createBuildFiles(buildToTargets)...)
+
+	return files
+}
+
+func createBuildFiles(buildToTargets map[string][]BazelTarget) []BazelFile {
+	files := make([]BazelFile, 0, len(buildToTargets))
+	for _, dir := range android.SortedStringKeys(buildToTargets) {
+		content := soongModuleLoad
+		targets := buildToTargets[dir]
+		sort.Slice(targets, func(i, j int) bool { return targets[i].name < targets[j].name })
+		for _, t := range targets {
+			content += "\n\n"
+			content += t.content
+		}
+		files = append(files, newFile(dir, "BUILD.bazel", content))
+	}
+	return files
+}
+
+func newFile(dir, basename, content string) BazelFile {
+	return BazelFile{
+		Dir:      dir,
+		Basename: basename,
+		Contents: content,
+	}
+}
+
+const (
+	bazelRulesSubDir = "build/bazel/queryview_rules"
+
+	// additional files:
+	//  * workspace file
+	//  * base BUILD file
+	//  * rules BUILD file
+	//  * rules providers.bzl file
+	//  * rules soong_module.bzl file
+	numAdditionalFiles = 5
+)
+
+var (
+	// Certain module property names are blocklisted/ignored here, for the reasons commented.
+	ignoredPropNames = map[string]bool{
+		"name":       true, // redundant, since this is explicitly generated for every target
+		"from":       true, // reserved keyword
+		"in":         true, // reserved keyword
+		"arch":       true, // interface prop type is not supported yet.
+		"multilib":   true, // interface prop type is not supported yet.
+		"target":     true, // interface prop type is not supported yet.
+		"visibility": true, // Bazel has native visibility semantics. Handle later.
+		"features":   true, // There is already a built-in attribute 'features' which cannot be overridden.
+	}
+)
+
+func shouldGenerateAttribute(prop string) bool {
+	return !ignoredPropNames[prop]
+}
+
+func shouldSkipStructField(field reflect.StructField) bool {
+	if field.PkgPath != "" {
+		// Skip unexported fields. Some properties are
+		// internal to Soong only, and these fields do not have PkgPath.
+		return true
+	}
+	// fields with tag `blueprint:"mutated"` are exported to enable modification in mutators, etc
+	// but cannot be set in a .bp file
+	if proptools.HasTag(field, "blueprint", "mutated") {
+		return true
+	}
+	return false
+}
+
+// FIXME(b/168089390): In Bazel, rules ending with "_test" needs to be marked as
+// testonly = True, forcing other rules that depend on _test rules to also be
+// marked as testonly = True. This semantic constraint is not present in Soong.
+// To work around, rename "*_test" rules to "*_test_".
+func canonicalizeModuleType(moduleName string) string {
+	if strings.HasSuffix(moduleName, "_test") {
+		return moduleName + "_"
+	}
+
+	return moduleName
+}