Merge pull request #136 from cdunn2001/test-both-styled-writers

Test both styled writers

Not only does this now test StyledStreamWriter the same way as StyledWriter, but it also makes the former work more like the latter, indenting separate lines of a comment before a value. Might break some user tests (as `operator<<()` uses `StyledStreamWriter`) but basically a harmless improvement.

All tests pass.

src/jsontestrunner/main.cpp

@@ -8,12 +8,22 @@
 
 #include <json/json.h>
 #include <algorithm> // sort
+#include <sstream>
 #include <stdio.h>
 
 #if defined(_MSC_VER) && _MSC_VER >= 1310
 #pragma warning(disable : 4996) // disable fopen deprecation warning
 #endif
 
+struct Options
+{
+  std::string path;
+  Json::Features features;
+  bool parseOnly;
+  typedef std::string (*writeFuncType)(Json::Value const&);
+  writeFuncType write;
+};
+
 static std::string normalizeFloatingPointStr(double value) {
   char buffer[32];
 #if defined(_MSC_VER) && defined(__STDC_SECURE_LIB__)
@@ -129,11 +139,12 @@ printValueTree(FILE* fout, Json::Value& value, const std::string& path = ".") {
 static int parseAndSaveValueTree(const std::string& input,
                                  const std::string& actual,
                                  const std::string& kind,
-                                 Json::Value& root,
                                  const Json::Features& features,
-                                 bool parseOnly) {
+                                 bool parseOnly,
+                                 Json::Value* root)
+{
   Json::Reader reader(features);
-  bool parsingSuccessful = reader.parse(input, root);
+  bool parsingSuccessful = reader.parse(input, *root);
   if (!parsingSuccessful) {
     printf("Failed to parse %s file: \n%s\n",
            kind.c_str(),
@@ -147,25 +158,43 @@ static int parseAndSaveValueTree(const std::string& input,
       printf("Failed to create %s actual file.\n", kind.c_str());
       return 2;
     }
-    printValueTree(factual, root);
+    printValueTree(factual, *root);
     fclose(factual);
   }
   return 0;
 }
-
+// static std::string useFastWriter(Json::Value const& root) {
-static int rewriteValueTree(const std::string& rewritePath,
-                            const Json::Value& root,
-                            std::string& rewrite) {
 //   Json::FastWriter writer;
 //   writer.enableYAMLCompatibility();
+//   return writer.write(root);
+// }
+static std::string useStyledWriter(
+    Json::Value const& root)
+{
   Json::StyledWriter writer;
-  rewrite = writer.write(root);
+  return writer.write(root);
+}
+static std::string useStyledStreamWriter(
+    Json::Value const& root)
+{
+  Json::StyledStreamWriter writer;
+  std::ostringstream sout;
+  writer.write(sout, root);
+  return sout.str();
+}
+static int rewriteValueTree(
+    const std::string& rewritePath,
+    const Json::Value& root,
+    Options::writeFuncType write,
+    std::string* rewrite)
+{
+  *rewrite = write(root);
   FILE* fout = fopen(rewritePath.c_str(), "wt");
   if (!fout) {
     printf("Failed to create rewrite file: %s\n", rewritePath.c_str());
     return 2;
   }
-  fprintf(fout, "%s\n", rewrite.c_str());
+  fprintf(fout, "%s\n", rewrite->c_str());
   fclose(fout);
   return 0;
 }
@@ -194,84 +223,96 @@ static int printUsage(const char* argv[]) {
   return 3;
 }
 
-int parseCommandLine(int argc,
+static int parseCommandLine(
-                     const char* argv[],
+    int argc, const char* argv[], Options* opts)
-                     Json::Features& features,
+{
-                     std::string& path,
+  opts->parseOnly = false;
-                     bool& parseOnly) {
+  opts->write = &useStyledWriter;
-  parseOnly = false;
   if (argc < 2) {
     return printUsage(argv);
   }
-
   int index = 1;
-  if (std::string(argv[1]) == "--json-checker") {
+  if (std::string(argv[index]) == "--json-checker") {
-    features = Json::Features::strictMode();
+    opts->features = Json::Features::strictMode();
-    parseOnly = true;
+    opts->parseOnly = true;
     ++index;
   }
-
+  if (std::string(argv[index]) == "--json-config") {
-  if (std::string(argv[1]) == "--json-config") {
     printConfig();
     return 3;
   }
-
+  if (std::string(argv[index]) == "--json-writer") {
+    ++index;
+    std::string const writerName(argv[index++]);
+    if (writerName == "StyledWriter") {
+      opts->write = &useStyledWriter;
+    } else if (writerName == "StyledStreamWriter") {
+      opts->write = &useStyledStreamWriter;
+    } else {
+      printf("Unknown '--json-writer %s'\n", writerName.c_str());
+      return 4;
+    }
+  }
   if (index == argc || index + 1 < argc) {
     return printUsage(argv);
   }
-
+  opts->path = argv[index];
-  path = argv[index];
   return 0;
 }
+static int runTest(Options const& opts)
+{
+  int exitCode = 0;
 
-int main(int argc, const char* argv[]) {
+  std::string input = readInputTestFile(opts.path.c_str());
-  std::string path;
-  Json::Features features;
-  bool parseOnly;
-  int exitCode = parseCommandLine(argc, argv, features, path, parseOnly);
-  if (exitCode != 0) {
-    return exitCode;
-  }
-
-  try {
-    std::string input = readInputTestFile(path.c_str());
   if (input.empty()) {
-      printf("Failed to read input or empty input: %s\n", path.c_str());
+    printf("Failed to read input or empty input: %s\n", opts.path.c_str());
     return 3;
   }
 
-    std::string basePath = removeSuffix(argv[1], ".json");
+  std::string basePath = removeSuffix(opts.path, ".json");
-    if (!parseOnly && basePath.empty()) {
+  if (!opts.parseOnly && basePath.empty()) {
     printf("Bad input path. Path does not end with '.expected':\n%s\n",
-             path.c_str());
+            opts.path.c_str());
     return 3;
   }
 
-    std::string actualPath = basePath + ".actual";
+  std::string const actualPath = basePath + ".actual";
-    std::string rewritePath = basePath + ".rewrite";
+  std::string const rewritePath = basePath + ".rewrite";
-    std::string rewriteActualPath = basePath + ".actual-rewrite";
+  std::string const rewriteActualPath = basePath + ".actual-rewrite";
 
   Json::Value root;
   exitCode = parseAndSaveValueTree(
-        input, actualPath, "input", root, features, parseOnly);
+      input, actualPath, "input",
-    if (exitCode == 0 && !parseOnly) {
+      opts.features, opts.parseOnly, &root);
+  if (exitCode || opts.parseOnly) {
+    return exitCode;
+  }
   std::string rewrite;
-      exitCode = rewriteValueTree(rewritePath, root, rewrite);
+  exitCode = rewriteValueTree(rewritePath, root, opts.write, &rewrite);
-      if (exitCode == 0) {
+  if (exitCode) {
+    return exitCode;
+  }
   Json::Value rewriteRoot;
-        exitCode = parseAndSaveValueTree(rewrite,
+  exitCode = parseAndSaveValueTree(
-                                         rewriteActualPath,
+      rewrite, rewriteActualPath, "rewrite",
-                                         "rewrite",
+      opts.features, opts.parseOnly, &rewriteRoot);
-                                         rewriteRoot,
+  if (exitCode) {
-                                         features,
+    return exitCode;
-                                         parseOnly);
   }
+  return 0;
 }
+int main(int argc, const char* argv[]) {
+  Options opts;
+  int exitCode = parseCommandLine(argc, argv, &opts);
+  if (exitCode != 0) {
+    printf("Failed to parse command-line.");
+    return exitCode;
+  }
+  try {
+    return runTest(opts);
   }
   catch (const std::exception& e) {
     printf("Unhandled exception:\n%s\n", e.what());
-    exitCode = 1;
+    return 1;
   }
-
-  return exitCode;
 }

src/lib_json/json_writer.cpp

@@ -628,7 +628,20 @@ void StyledStreamWriter::unindent() {
 void StyledStreamWriter::writeCommentBeforeValue(const Value& root) {
   if (!root.hasComment(commentBefore))
     return;
-  *document_ << root.getComment(commentBefore);
+
+  *document_ << "\n";
+  writeIndent();
+  const std::string& comment = root.getComment(commentBefore);
+  std::string::const_iterator iter = comment.begin();
+  while (iter != comment.end()) {
+    *document_ << *iter;
+    if (*iter == '\n' &&
+       (iter != comment.end() && *(iter + 1) == '/'))
+      writeIndent();
+    ++iter;
+  }
+
+  // Comments are stripped of trailing newlines, so add one here
   *document_ << "\n";
 }
 

test/runjsontests.py

@@ -14,6 +14,7 @@ def getStatusOutput(cmd):
     Return int, unicode (for both Python 2 and 3).
     Note: os.popen().close() would return None for 0.
     """
+    print(cmd, file=sys.stderr)
     pipe = os.popen(cmd)
     process_output = pipe.read()
     try:
@@ -57,7 +58,8 @@ def safeReadFile( path ):
         return '<File "%s" is missing: %s>' % (path,e)
 
 def runAllTests( jsontest_executable_path, input_dir = None,
-                 use_valgrind=False, with_json_checker=False ):
+                 use_valgrind=False, with_json_checker=False,
+                 writerClass='StyledWriter'):
     if not input_dir:
         input_dir = os.path.join( os.getcwd(), 'data' )
     tests = glob( os.path.join( input_dir, '*.json' ) )
@@ -72,6 +74,7 @@ def runAllTests( jsontest_executable_path, input_dir = None,
         is_json_checker_test = (input_path in test_jsonchecker) or expect_failure
         print('TESTING:', input_path, end=' ')
         options = is_json_checker_test and '--json-checker' or ''
+        options += ' --json-writer %s'%writerClass
         cmd = '%s%s %s "%s"' % (
             valgrind_path, jsontest_executable_path, options,
             input_path)
@@ -145,7 +148,15 @@ def main():
     else:
         input_path = None
     status = runAllTests( jsontest_executable_path, input_path,
-                          use_valgrind=options.valgrind, with_json_checker=options.with_json_checker )
+                          use_valgrind=options.valgrind,
+                          with_json_checker=options.with_json_checker,
+                          writerClass='StyledWriter')
+    if status:
+        sys.exit( status )
+    status = runAllTests( jsontest_executable_path, input_path,
+                          use_valgrind=options.valgrind,
+                          with_json_checker=options.with_json_checker,
+                          writerClass='StyledStreamWriter')
     sys.exit( status )
 
 if __name__ == '__main__':