Add a new property trim_extension for gensrcs

In order to provide a more flexible ability for gensrcs's output, due to
current output_extension property will only allow to replace the string
after the last "." of input, in order to handle input with multiple dot
in file name, provide a way to trim the suffix of input string.

Bug: 335536003
Test: cd build/soong/genrule ; go test -run TestGenSrcs
Test: cd build/soong/genrule ; go test -run TestGenSrcsWithTrimExtAndOutpuExtension
Test: cd build/soong/genrule ; go test -run TestGenSrcsWithTrimExtButNoOutpuExtension
Test: cd build/soong/genrule ; go test -run TestGenSrcsWithOutpuExtension
Test: cd build/soong/android ; go test -run TestPathsForModuleSrc

Change-Id: I033bbe1d225f207f0f6bdc140df308884f214b51
diff --git a/android/paths.go b/android/paths.go
index 2b33f67..39b660c 100644
--- a/android/paths.go
+++ b/android/paths.go
@@ -277,6 +277,7 @@
 
 type genPathProvider interface {
 	genPathWithExt(ctx ModuleOutPathContext, subdir, ext string) ModuleGenPath
+	genPathWithExtAndTrimExt(ctx ModuleOutPathContext, subdir, ext string, trimExt string) ModuleGenPath
 }
 type objPathProvider interface {
 	objPathWithExt(ctx ModuleOutPathContext, subdir, ext string) ModuleObjPath
@@ -295,6 +296,16 @@
 	return PathForModuleGen(ctx)
 }
 
+// GenPathWithExtAndTrimExt derives a new file path in ctx's generated sources directory
+// from the current path, but with the new extension and trim the suffix.
+func GenPathWithExtAndTrimExt(ctx ModuleOutPathContext, subdir string, p Path, ext string, trimExt string) ModuleGenPath {
+	if path, ok := p.(genPathProvider); ok {
+		return path.genPathWithExtAndTrimExt(ctx, subdir, ext, trimExt)
+	}
+	ReportPathErrorf(ctx, "Tried to create generated file from unsupported path: %s(%s)", reflect.TypeOf(p).Name(), p)
+	return PathForModuleGen(ctx)
+}
+
 // ObjPathWithExt derives a new file path in ctx's object directory from the
 // current path, but with the new extension.
 func ObjPathWithExt(ctx ModuleOutPathContext, subdir string, p Path, ext string) ModuleObjPath {
@@ -1507,6 +1518,17 @@
 	return PathForModuleGen(ctx, subdir, pathtools.ReplaceExtension(p.path, ext))
 }
 
+func (p SourcePath) genPathWithExtAndTrimExt(ctx ModuleOutPathContext, subdir, ext string, trimExt string) ModuleGenPath {
+	// If Trim_extension being set, force append Output_extension without replace original extension.
+	if trimExt != "" {
+		if ext != "" {
+			return PathForModuleGen(ctx, subdir, strings.TrimSuffix(p.path, trimExt)+"."+ext)
+		}
+		return PathForModuleGen(ctx, subdir, strings.TrimSuffix(p.path, trimExt))
+	}
+	return PathForModuleGen(ctx, subdir, pathtools.ReplaceExtension(p.path, ext))
+}
+
 func (p SourcePath) objPathWithExt(ctx ModuleOutPathContext, subdir, ext string) ModuleObjPath {
 	return PathForModuleObj(ctx, subdir, pathtools.ReplaceExtension(p.path, ext))
 }
@@ -1594,6 +1616,17 @@
 	return PathForModuleGen(ctx, subdir, pathtools.ReplaceExtension(p.path, ext))
 }
 
+func (p ModuleGenPath) genPathWithExtAndTrimExt(ctx ModuleOutPathContext, subdir, ext string, trimExt string) ModuleGenPath {
+	// If Trim_extension being set, force append Output_extension without replace original extension.
+	if trimExt != "" {
+		if ext != "" {
+			return PathForModuleGen(ctx, subdir, strings.TrimSuffix(p.path, trimExt)+"."+ext)
+		}
+		return PathForModuleGen(ctx, subdir, strings.TrimSuffix(p.path, trimExt))
+	}
+	return PathForModuleGen(ctx, subdir, pathtools.ReplaceExtension(p.path, ext))
+}
+
 func (p ModuleGenPath) objPathWithExt(ctx ModuleOutPathContext, subdir, ext string) ModuleObjPath {
 	return PathForModuleObj(ctx, subdir, pathtools.ReplaceExtension(p.path, ext))
 }