json: Add new module

Only has methods for writing JSON for now.
Will let you create invalid json, but should assert if you do.

1 files changed, 221 insertions, 0 deletions

diff --git a/test/json.cc b/test/json.cc
new file mode 100644
index 0000000..2fc7ad2
--- /dev/null
+++ b/test/json.cc
@@ -0,0 +1,221 @@
+#include "json.hh"
+
+#include <cstdint>
+#include <gtest/gtest.h>
+#include <memory>
+#include <sstream>
+#include <string>
+#include <utility>
+
+namespace {
+
+enum class Output : uint8_t {
+  String,
+  Stream,
+};
+
+class Writer : public testing::TestWithParam<Output> {
+ protected:
+  std::unique_ptr<json::Writer> make() {
+    switch (GetParam()) {
+      case Output::String:
+        return json::writer(str_);
+      case Output::Stream:
+        return json::writer(stream_);
+    }
+    std::unreachable();
+  }
+
+  std::string str() {
+    switch (GetParam()) {
+      case Output::String:
+        return std::move(str_);
+      case Output::Stream:
+        return stream_.str();
+    }
+    std::unreachable();
+  }
+
+ private:
+  std::string str_;
+  std::stringstream stream_;
+};
+
+}  // namespace
+
+TEST_P(Writer, example1) {
+  auto writer = make();
+  writer->start_object();
+
+  writer->key("glossary");
+  writer->start_object();
+
+  writer->key("title");
+  writer->value("example glossary");
+
+  writer->key("GlossDiv");
+  writer->start_object();
+
+  writer->key("title");
+  writer->value("S");
+
+  writer->key("GlossList");
+  writer->start_object();
+
+  writer->key("GlossEntry");
+  writer->start_object();
+
+  writer->key("ID");
+  writer->value("SGML");
+  writer->key("SortAs");
+  writer->value("SGML");
+  writer->key("GlossTerm");
+  writer->value("Standard Generalized Markup Language");
+  writer->key("Acronym");
+  writer->value("SGML");
+  writer->key("Abbrev");
+  writer->value("ISO 8879:1986");
+
+  writer->key("GlossDef");
+  writer->start_object();
+
+  writer->key("para");
+  writer->value(
+      "A meta-markup language, used to create markup languages such as "
+      "DocBook.");
+
+  writer->key("GlossSeeAlso");
+  writer->start_array();
+  writer->value("GML");
+  writer->value("XML");
+  writer->end_array();
+
+  writer->end_object();
+
+  writer->key("GlossSee");
+  writer->value("markup");
+
+  writer->end_object();
+
+  writer->end_object();
+
+  writer->end_object();
+
+  writer->end_object();
+
+  writer->end_object();
+
+  EXPECT_EQ(
+      R"({"glossary":{"title":"example glossary","GlossDiv":{"title":"S","GlossList":{"GlossEntry":{"ID":"SGML","SortAs":"SGML","GlossTerm":"Standard Generalized Markup Language","Acronym":"SGML","Abbrev":"ISO 8879:1986","GlossDef":{"para":"A meta-markup language, used to create markup languages such as DocBook.","GlossSeeAlso":["GML","XML"]},"GlossSee":"markup"}}}}})",
+      str());
+}
+
+TEST_P(Writer, example2) {
+  auto writer = make();
+  writer->start_object();
+
+  writer->key("widget");
+  writer->start_object();
+
+  writer->key("debug");
+  writer->value("on");
+
+  writer->key("window");
+  writer->start_object();
+
+  writer->key("title");
+  writer->value("Sample Konfabulator Widget");
+  writer->key("name");
+  writer->value("main_window");
+  writer->key("width");
+  writer->value(500);
+  writer->key("height");
+  writer->value(500);
+
+  writer->end_object();
+
+  writer->key("image");
+  writer->start_object();
+
+  writer->key("src");
+  writer->value("Images/Sun.png");
+  writer->key("name");
+  writer->value("sun1");
+  writer->key("hOffset");
+  writer->value(250);
+  writer->key("vOffset");
+  writer->value(250);
+  writer->key("alignment");
+  writer->value("center");
+
+  writer->end_object();
+
+  writer->key("text");
+  writer->start_object();
+
+  writer->key("data");
+  writer->value("Click Here");
+  writer->key("size");
+  writer->value(36);
+  writer->key("style");
+  writer->value("bold");
+  writer->key("name");
+  writer->value("text1");
+  writer->key("hOffset");
+  writer->value(250);
+  writer->key("vOffset");
+  writer->value(100);
+  writer->key("alignment");
+  writer->value("center");
+  writer->key("onMouseUp");
+  writer->value("sun1.opacity = (sun1.opacity / 100) * 90;");
+
+  writer->end_object();
+
+  writer->end_object();
+
+  writer->end_object();
+
+  EXPECT_EQ(
+      R"({"widget":{"debug":"on","window":{"title":"Sample Konfabulator Widget","name":"main_window","width":500,"height":500},"image":{"src":"Images/Sun.png","name":"sun1","hOffset":250,"vOffset":250,"alignment":"center"},"text":{"data":"Click Here","size":36,"style":"bold","name":"text1","hOffset":250,"vOffset":100,"alignment":"center","onMouseUp":"sun1.opacity = (sun1.opacity / 100) * 90;"}}})",
+      str());
+}
+
+TEST_P(Writer, quote1) {
+  auto writer = make();
+  writer->value(R"("Example text")");
+
+  EXPECT_EQ(R"("\"Example text\"")", str());
+}
+
+TEST_P(Writer, quote2) {
+  auto writer = make();
+  writer->value(R"(\"Example text\")");
+
+  EXPECT_EQ(R"("\\\"Example text\\\"")", str());
+}
+
+TEST_P(Writer, quote3) {
+  auto writer = make();
+  writer->value(R"(
+)");
+
+  EXPECT_EQ(R"("\n")", str());
+}
+
+TEST_P(Writer, float) {
+  auto writer = make();
+  writer->value(3.14F);
+
+  EXPECT_EQ("3.14", str());
+}
+
+TEST_P(Writer, double) {
+  auto writer = make();
+  writer->value(3.14);
+
+  EXPECT_EQ("3.14", str());
+}
+
+INSTANTIATE_TEST_SUITE_P(AllOutputs, Writer,
+                         testing::Values(Output::String, Output::Stream));