llcppsigfetch:basic marco process

chore/_xtool/llcppsigfetch/parse/cvt_test/preprocess_test/llgo.expect

@@ -0,0 +1,24 @@
+#stdout
+TestDefine Case 1:
+{
+	"temp.h":	{
+		"path":	"temp.h",
+		"decls":	[],
+		"includes":	[],
+		"macros":	[{
+				"Name":	{
+					"Token":	2,
+					"Lit":	"foo"
+				},
+				"Body":	[{
+						"Token":	3,
+						"Lit":	"1"
+					}]
+			}]
+	}
+}
+
+
+#stderr
+
+#exit 0

chore/_xtool/llcppsigfetch/parse/cvt_test/preprocess_test/preprocess.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/chore/_xtool/llcppsigfetch/parse"
+)
+
+func main() {
+	TestDefine()
+}
+
+func TestDefine() {
+	testCases := []string{
+		`#define foo 1`,
+	}
+
+	for i, content := range testCases {
+		converter, err := parse.NewConverter(content, true)
+		if err != nil {
+			panic(err)
+		}
+
+		_, err = converter.Convert()
+		if err != nil {
+			panic(err)
+		}
+
+		json := converter.MarshalASTFiles()
+		c.Printf(c.Str("TestDefine Case %d:\n%s\n\n"), c.Int(i+1), json.Print())
+
+		converter.Dispose()
+	}
+}