Allow specifying whether top level elements should be comma separated

example/main.c

@@ -4,7 +4,7 @@
 
 int main()
 {
-    auto json = json_init(stdout, INDENT_2);
+    auto json = json_init(stdout, MINIFIED, false);
 
     json_begin_object(&json);
     {

json.c

@@ -4,13 +4,14 @@
 
 #define UNREACHABLE() assert(false)
 
-Json json_init(FILE* stream, Whitespace whitespace)
+Json json_init(FILE* stream, Whitespace whitespace, bool comma_separate)
 {
     return (Json){
         .stream = stream,
         .whitespace = whitespace,
         .indent_level = 0,
         .next_punctuation = BEGINNING,
+        .comma_separate = comma_separate,
     };
 }
 
@@ -169,7 +170,11 @@ void begin_value(Json* json)
 /// End a JSON value.
 void end_value(Json* json)
 {
+    if (json->indent_level > 0 || json->comma_separate) {
         json->next_punctuation = COMMA;
+    } else {
+        json->next_punctuation = BEGINNING;
+    }
 }
 
 /// Increment the indent level by one.

json.h

@@ -25,9 +25,10 @@ typedef struct Json {
     Whitespace whitespace;
     int indent_level;
     Punctuation next_punctuation;
+    bool comma_separate;
 } Json;
 
-Json json_init(FILE* stream, Whitespace whitespace);
+Json json_init(FILE* stream, Whitespace whitespace, bool comma_separate);
 void json_free(Json* json);
 
 void json_begin_array(Json* json);

tests/CMakeLists.txt

@@ -13,6 +13,8 @@ list(
         json_tests_array
         json_tests_object
         json_tests_complex
+        json_tests_comma_separated
+        json_tests_non_comma_separated
 )
 foreach(JSON_TEST IN LISTS JSON_TESTS)
     add_executable(

tests/json_tests_array.c

@@ -15,7 +15,7 @@ void setUp()
     tmp = tmpfile();
     TEST_ASSERT_NOT_NULL(tmp);
 
-    json = json_init(tmp, MINIFIED);
+    json = json_init(tmp, MINIFIED, false);
 }
 
 void tearDown()

tests/json_tests_comma_separated.c

@@ -0,0 +1,147 @@
+#include <stdio.h>
+#include <string.h>
+
+#include <unity.h>
+
+#include <json.h>
+
+static FILE* tmp = nullptr;
+static char buffer[256];
+
+static Json json;
+
+void setUp()
+{
+    tmp = tmpfile();
+    TEST_ASSERT_NOT_NULL(tmp);
+
+    json = json_init(tmp, MINIFIED, true);
+}
+
+void tearDown()
+{
+    json_free(&json);
+
+    if (tmp) {
+        fclose(tmp);
+        tmp = nullptr;
+    }
+}
+
+void test_json_comma_separated_string()
+{
+    json_add_string(&json, "one");
+    json_add_string(&json, "two");
+    fflush(tmp);
+    rewind(tmp);
+
+    auto n = fread(buffer, 1, sizeof(buffer) - 1, tmp);
+    buffer[n] = '\0';
+
+    TEST_ASSERT_EQUAL_STRING("\"one\",\"two\"", buffer);
+}
+
+void test_json_comma_separated_long()
+{
+    json_add_long(&json, 42);
+    json_add_long(&json, 67);
+    fflush(tmp);
+    rewind(tmp);
+
+    auto n = fread(buffer, 1, sizeof(buffer) - 1, tmp);
+    buffer[n] = '\0';
+
+    TEST_ASSERT_EQUAL_STRING("42,67", buffer);
+}
+
+void test_json_comma_separated_double()
+{
+    json_add_double(&json, 3.14);
+    json_add_double(&json, 6.28);
+    fflush(tmp);
+    rewind(tmp);
+
+    auto n = fread(buffer, 1, sizeof(buffer) - 1, tmp);
+    buffer[n] = '\0';
+
+    TEST_ASSERT_EQUAL_STRING("3.14,6.28", buffer);
+}
+
+void test_json_comma_separated_bool()
+{
+    json_add_bool(&json, true);
+    json_add_bool(&json, false);
+    fflush(tmp);
+    rewind(tmp);
+
+    auto n = fread(buffer, 1, sizeof(buffer) - 1, tmp);
+    buffer[n] = '\0';
+
+    TEST_ASSERT_EQUAL_STRING("true,false", buffer);
+}
+
+void test_json_comma_separated_null()
+{
+    json_add_null(&json);
+    json_add_null(&json);
+    fflush(tmp);
+    rewind(tmp);
+
+    auto n = fread(buffer, 1, sizeof(buffer) - 1, tmp);
+    buffer[n] = '\0';
+
+    TEST_ASSERT_EQUAL_STRING("null,null", buffer);
+}
+
+void test_json_comma_separated_object()
+{
+    for (int i = 0; i < 2; ++i) {
+        json_begin_object(&json);
+        {
+            json_add_object_field(&json, "test");
+            json_add_number(&json, i);
+        }
+        json_end_object(&json);
+    }
+    fflush(tmp);
+    rewind(tmp);
+
+    auto n = fread(buffer, 1, sizeof(buffer) - 1, tmp);
+    buffer[n] = '\0';
+
+    TEST_ASSERT_EQUAL_STRING("{\"test\":0},{\"test\":1}", buffer);
+}
+
+void test_json_comma_separated_array()
+{
+    for (int i = 0; i < 2; ++i) {
+        json_begin_array(&json);
+        {
+            json_add_number(&json, i);
+        }
+        json_end_array(&json);
+    }
+    fflush(tmp);
+    rewind(tmp);
+
+    auto n = fread(buffer, 1, sizeof(buffer) - 1, tmp);
+    buffer[n] = '\0';
+
+    TEST_ASSERT_EQUAL_STRING("[0],[1]", buffer);
+}
+
+int main()
+{
+    UNITY_BEGIN();
+    {
+        RUN_TEST(test_json_comma_separated_string);
+        RUN_TEST(test_json_comma_separated_long);
+        RUN_TEST(test_json_comma_separated_double);
+        RUN_TEST(test_json_comma_separated_bool);
+        RUN_TEST(test_json_comma_separated_null);
+        RUN_TEST(test_json_comma_separated_object);
+        RUN_TEST(test_json_comma_separated_array);
+    }
+    return UNITY_END();
+}
+

tests/json_tests_complex.c

@@ -15,7 +15,7 @@ void setUp()
     tmp = tmpfile();
     TEST_ASSERT_NOT_NULL(tmp);
 
-    json = json_init(tmp, INDENT_TAB);
+    json = json_init(tmp, INDENT_TAB, false);
 }
 
 void tearDown()

tests/json_tests_non_comma_separated.c

@@ -0,0 +1,147 @@
+#include <stdio.h>
+#include <string.h>
+
+#include <unity.h>
+
+#include <json.h>
+
+static FILE* tmp = nullptr;
+static char buffer[256];
+
+static Json json;
+
+void setUp()
+{
+    tmp = tmpfile();
+    TEST_ASSERT_NOT_NULL(tmp);
+
+    json = json_init(tmp, MINIFIED, false);
+}
+
+void tearDown()
+{
+    json_free(&json);
+
+    if (tmp) {
+        fclose(tmp);
+        tmp = nullptr;
+    }
+}
+
+void test_json_non_comma_separated_string()
+{
+    json_add_string(&json, "one");
+    json_add_string(&json, "two");
+    fflush(tmp);
+    rewind(tmp);
+
+    auto n = fread(buffer, 1, sizeof(buffer) - 1, tmp);
+    buffer[n] = '\0';
+
+    TEST_ASSERT_EQUAL_STRING("\"one\"\"two\"", buffer);
+}
+
+void test_json_non_comma_separated_long()
+{
+    json_add_long(&json, 42);
+    json_add_long(&json, 67);
+    fflush(tmp);
+    rewind(tmp);
+
+    auto n = fread(buffer, 1, sizeof(buffer) - 1, tmp);
+    buffer[n] = '\0';
+
+    TEST_ASSERT_EQUAL_STRING("4267", buffer);
+}
+
+void test_json_non_comma_separated_double()
+{
+    json_add_double(&json, 3.14);
+    json_add_double(&json, 6.28);
+    fflush(tmp);
+    rewind(tmp);
+
+    auto n = fread(buffer, 1, sizeof(buffer) - 1, tmp);
+    buffer[n] = '\0';
+
+    TEST_ASSERT_EQUAL_STRING("3.146.28", buffer);
+}
+
+void test_json_non_comma_separated_bool()
+{
+    json_add_bool(&json, true);
+    json_add_bool(&json, false);
+    fflush(tmp);
+    rewind(tmp);
+
+    auto n = fread(buffer, 1, sizeof(buffer) - 1, tmp);
+    buffer[n] = '\0';
+
+    TEST_ASSERT_EQUAL_STRING("truefalse", buffer);
+}
+
+void test_json_non_comma_separated_null()
+{
+    json_add_null(&json);
+    json_add_null(&json);
+    fflush(tmp);
+    rewind(tmp);
+
+    auto n = fread(buffer, 1, sizeof(buffer) - 1, tmp);
+    buffer[n] = '\0';
+
+    TEST_ASSERT_EQUAL_STRING("nullnull", buffer);
+}
+
+void test_json_non_comma_separated_object()
+{
+    for (int i = 0; i < 2; ++i) {
+        json_begin_object(&json);
+        {
+            json_add_object_field(&json, "test");
+            json_add_number(&json, i);
+        }
+        json_end_object(&json);
+    }
+    fflush(tmp);
+    rewind(tmp);
+
+    auto n = fread(buffer, 1, sizeof(buffer) - 1, tmp);
+    buffer[n] = '\0';
+
+    TEST_ASSERT_EQUAL_STRING("{\"test\":0}{\"test\":1}", buffer);
+}
+
+void test_json_non_comma_separated_array()
+{
+    for (int i = 0; i < 2; ++i) {
+        json_begin_array(&json);
+        {
+            json_add_number(&json, i);
+        }
+        json_end_array(&json);
+    }
+    fflush(tmp);
+    rewind(tmp);
+
+    auto n = fread(buffer, 1, sizeof(buffer) - 1, tmp);
+    buffer[n] = '\0';
+
+    TEST_ASSERT_EQUAL_STRING("[0][1]", buffer);
+}
+
+int main()
+{
+    UNITY_BEGIN();
+    {
+        RUN_TEST(test_json_non_comma_separated_string);
+        RUN_TEST(test_json_non_comma_separated_long);
+        RUN_TEST(test_json_non_comma_separated_double);
+        RUN_TEST(test_json_non_comma_separated_bool);
+        RUN_TEST(test_json_non_comma_separated_null);
+        RUN_TEST(test_json_non_comma_separated_object);
+        RUN_TEST(test_json_non_comma_separated_array);
+    }
+    return UNITY_END();
+}
+

tests/json_tests_object.c

@@ -15,7 +15,7 @@ void setUp()
     tmp = tmpfile();
     TEST_ASSERT_NOT_NULL(tmp);
 
-    json = json_init(tmp, MINIFIED);
+    json = json_init(tmp, MINIFIED, false);
 }
 
 void tearDown()

tests/json_tests_simple.c

@@ -15,7 +15,7 @@ void setUp()
     tmp = tmpfile();
     TEST_ASSERT_NOT_NULL(tmp);
 
-    json = json_init(tmp, MINIFIED);
+    json = json_init(tmp, MINIFIED, false);
 }
 
 void tearDown()