Convert DITLs to JSON

rapidjson/example/schemavalidator/schemavalidator.cpp

@@ -0,0 +1,78 @@
+// Schema Validator example
+
+// The example validates JSON text from stdin with a JSON schema specified in the argument.
+
+#include "rapidjson/error/en.h"
+#include "rapidjson/filereadstream.h"
+#include "rapidjson/schema.h"
+#include "rapidjson/stringbuffer.h"
+#include "rapidjson/prettywriter.h"
+
+using namespace rapidjson;
+
+int main(int argc, char *argv[]) {
+    if (argc != 2) {
+        fprintf(stderr, "Usage: schemavalidator schema.json < input.json\n");
+        return EXIT_FAILURE;
+    }
+
+    // Read a JSON schema from file into Document
+    Document d;
+    char buffer[4096];
+
+    {
+        FILE *fp = fopen(argv[1], "r");
+        if (!fp) {
+            printf("Schema file '%s' not found\n", argv[1]);
+            return -1;
+        }
+        FileReadStream fs(fp, buffer, sizeof(buffer));
+        d.ParseStream(fs);
+        if (d.HasParseError()) {
+            fprintf(stderr, "Schema file '%s' is not a valid JSON\n", argv[1]);
+            fprintf(stderr, "Error(offset %u): %s\n",
+                static_cast<unsigned>(d.GetErrorOffset()),
+                GetParseError_En(d.GetParseError()));
+            fclose(fp);
+            return EXIT_FAILURE;
+        }
+        fclose(fp);
+    }
+    
+    // Then convert the Document into SchemaDocument
+    SchemaDocument sd(d);
+
+    // Use reader to parse the JSON in stdin, and forward SAX events to validator
+    SchemaValidator validator(sd);
+    Reader reader;
+    FileReadStream is(stdin, buffer, sizeof(buffer));
+    if (!reader.Parse(is, validator) && reader.GetParseErrorCode() != kParseErrorTermination) {
+        // Schema validator error would cause kParseErrorTermination, which will handle it in next step.
+        fprintf(stderr, "Input is not a valid JSON\n");
+        fprintf(stderr, "Error(offset %u): %s\n",
+            static_cast<unsigned>(reader.GetErrorOffset()),
+            GetParseError_En(reader.GetParseErrorCode()));
+    }
+
+    // Check the validation result
+    if (validator.IsValid()) {
+        printf("Input JSON is valid.\n");
+        return EXIT_SUCCESS;
+    }
+    else {
+        printf("Input JSON is invalid.\n");
+        StringBuffer sb;
+        validator.GetInvalidSchemaPointer().StringifyUriFragment(sb);
+        fprintf(stderr, "Invalid schema: %s\n", sb.GetString());
+        fprintf(stderr, "Invalid keyword: %s\n", validator.GetInvalidSchemaKeyword());
+        sb.Clear();
+        validator.GetInvalidDocumentPointer().StringifyUriFragment(sb);
+        fprintf(stderr, "Invalid document: %s\n", sb.GetString());
+        // Detailed violation report is available as a JSON value
+        sb.Clear();
+        PrettyWriter<StringBuffer> w(sb);
+        validator.GetError().Accept(w);
+        fprintf(stderr, "Error report:\n%s\n", sb.GetString());
+        return EXIT_FAILURE;
+    }
+}