feat: add optional latex block support

tests/maddy/test_maddy_latexblockparser.cpp

@@ -0,0 +1,102 @@
+/*
+ * This project is licensed under the MIT license. For more information see the
+ * LICENSE file.
+ */
+#include <memory>
+
+#include "gmock/gmock.h"
+
+#include "maddy/latexblockparser.h"
+
+// -----------------------------------------------------------------------------
+
+class MADDY_LATEXBLOCKPARSER : public ::testing::Test
+{
+protected:
+  std::shared_ptr<maddy::LatexBlockParser> lbParser;
+
+  void
+  SetUp() override
+  {
+    this->lbParser = std::make_shared<maddy::LatexBlockParser>(
+      nullptr,
+      nullptr
+    );
+  }
+};
+
+// -----------------------------------------------------------------------------
+
+TEST_F(MADDY_LATEXBLOCKPARSER, IsStartingLineReturnsTrueWhenFacedWithTwoDollars)
+{
+  ASSERT_TRUE(maddy::LatexBlockParser::IsStartingLine("$$"));
+}
+
+TEST_F(MADDY_LATEXBLOCKPARSER, IsFinishedReturnsFalseInTheBeginning)
+{
+  ASSERT_FALSE(lbParser->IsFinished());
+}
+
+TEST_F(MADDY_LATEXBLOCKPARSER, ItReplacesOneLineMarkdownWithALatexBlock)
+{
+  std::vector<std::string> markdown = {
+    "$$x = {-b \\pm \\sqrt{b^2-4ac} \\over 2a}.$$"
+  };
+
+  std::string expected = "$$x = {-b \\pm \\sqrt{b^2-4ac} \\over 2a}.$$\n";
+
+  for (std::string md : markdown)
+  {
+    lbParser->AddLine(md);
+  }
+  ASSERT_TRUE(lbParser->IsFinished());
+
+  std::stringstream& output(lbParser->GetResult());
+  const std::string& outputString = output.str();
+
+  ASSERT_EQ(expected, outputString);
+}
+
+TEST_F(MADDY_LATEXBLOCKPARSER, ItReplacesABlockMarkdownWithALatexBlock)
+{
+  std::vector<std::string> markdown = {
+    "$$",
+    "x = {-b \\pm \\sqrt{b^2-4ac} \\over 2a}.",
+    "$$"
+  };
+
+  std::string expected = "$$\nx = {-b \\pm \\sqrt{b^2-4ac} \\over 2a}.\n$$\n";
+
+  for (std::string md : markdown)
+  {
+    lbParser->AddLine(md);
+  }
+  ASSERT_TRUE(lbParser->IsFinished());
+
+  std::stringstream& output(lbParser->GetResult());
+  const std::string& outputString = output.str();
+
+  ASSERT_EQ(expected, outputString);
+}
+
+TEST_F(MADDY_LATEXBLOCKPARSER, ItReplacesAMultilineBlockMarkdownWithALatexBlock)
+{
+  std::vector<std::string> markdown = {
+    "$$",
+    "x = {-b \\pm \\sqrt{b^2-4ac}",
+    "\\over 2a}.$$"
+  };
+
+  std::string expected = "$$\nx = {-b \\pm \\sqrt{b^2-4ac}\n\\over 2a}.$$\n";
+
+  for (std::string md : markdown)
+  {
+    lbParser->AddLine(md);
+  }
+  ASSERT_TRUE(lbParser->IsFinished());
+
+  std::stringstream& output(lbParser->GetResult());
+  const std::string& outputString = output.str();
+
+  ASSERT_EQ(expected, outputString);
+}