improve documentation

.github/workflows/documentation.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   build-deploy:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@master
 

doc/Doxyfile

@@ -38,7 +38,7 @@ PROJECT_NAME           = "Inja"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 2.0.0
+PROJECT_NUMBER         = 2.1.0
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
@@ -51,7 +51,7 @@ PROJECT_BRIEF          = "A Template Engine for Modern C++"
 # pixels and the maximum width should not exceed 200 pixels. Doxygen will copy
 # the logo to the output directory.
 
-PROJECT_LOGO           = "./logo.jpg"
+PROJECT_LOGO           = "./logo-doxygen.jpg"
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) path
 # into which the generated documentation will be written. If a relative path is
@@ -792,7 +792,8 @@ WARN_LOGFILE           =
 # Note: If this tag is empty the current directory is searched.
 
 INPUT                  =  ../include/inja \
-                          ../README.md
+                          ../README.md \
+                          support.md
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
@@ -908,7 +909,7 @@ EXCLUDE_SYMBOLS        = stdinja
 # that contain example code fragments that are included (see the \include
 # command).
 
-EXAMPLE_PATH           =
+EXAMPLE_PATH           = ./examples
 
 # If the value of the EXAMPLE_PATH tag contains directories, you can use the
 # EXAMPLE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp and
@@ -922,7 +923,7 @@ EXAMPLE_PATTERNS       = *
 # irrespective of the value of the RECURSIVE tag.
 # The default value is: NO.
 
-EXAMPLE_RECURSIVE      = NO
+EXAMPLE_RECURSIVE      = YES
 
 # The IMAGE_PATH tag can be used to specify one or more files or directories
 # that contain images that are to be included in the documentation (see the
@@ -1657,7 +1658,7 @@ EXTRA_SEARCH_MAPPINGS  =
 # If the GENERATE_LATEX tag is set to YES, doxygen will generate LaTeX output.
 # The default value is: YES.
 
-GENERATE_LATEX         = YES
+GENERATE_LATEX         = NO
 
 # The LATEX_OUTPUT tag is used to specify where the LaTeX docs will be put. If a
 # relative path is entered the value of OUTPUT_DIRECTORY will be put in front of

doc/support.md

@@ -0,0 +1,3 @@
+@page support_page Support
+
+If you have questions or issues regarding the use of doxygen, please use the Github [Issue Tracker](https://github.com/pantor/inja/issues). You can always contribute by helping with programming, testing and filing bug reports, and improving documentation!

include/inja/config.hpp

@@ -14,6 +14,9 @@ enum class ElementNotation {
   Pointer
 };
 
+/*!
+ * \brief Class for lexer configuration.
+ */
 struct LexerConfig {
   std::string statement_open {"{%"};
   std::string statement_close {"%}"};
@@ -44,6 +47,9 @@ struct LexerConfig {
   }
 };
 
+/*!
+ * \brief Class for parser configuration.
+ */
 struct ParserConfig {
   ElementNotation notation {ElementNotation::Dot};
 };

include/inja/environment.hpp

@@ -22,6 +22,9 @@ namespace inja {
 
 using namespace nlohmann;
 
+/*!
+ * \brief Class for changing the configuration.
+ */
 class Environment {
   class Impl {
    public:

include/inja/function_storage.hpp

@@ -12,6 +12,9 @@ using namespace nlohmann;
 using Arguments = std::vector<const json*>;
 using CallbackFunction = std::function<json(Arguments& args)>;
 
+/*!
+ * \brief Class for builtin functions and user-defined callbacks.
+ */
 class FunctionStorage {
  public:
   void add_builtin(nonstd::string_view name, unsigned int num_args, Bytecode::Op op) {

include/inja/lexer.hpp

@@ -11,6 +11,9 @@
 
 namespace inja {
 
+/*!
+ * \brief Class for lexing an inja Template.
+ */
 class Lexer {
   enum class State {
     Text,

include/inja/parser.hpp

@@ -58,6 +58,9 @@ class ParserStatic {
   FunctionStorage functions;
 };
 
+/*!
+ * \brief Class for parsing an inja Template.
+ */
 class Parser {
  public:
   explicit Parser(const ParserConfig& parser_config, const LexerConfig& lexer_config, TemplateStorage& included_templates): m_config(parser_config), m_lexer(lexer_config), m_included_templates(included_templates), m_static(ParserStatic::get_instance()) { }

include/inja/renderer.hpp

@@ -24,6 +24,9 @@ inline nonstd::string_view convert_dot_to_json_pointer(nonstd::string_view dot,
   return nonstd::string_view(out.data(), out.size());
 }
 
+/*!
+ * \brief Class for rendering a Template with data.
+ */
 class Renderer {
   std::vector<const json*>& get_args(const Bytecode& bc) {
     m_tmp_args.clear();

include/inja/template.hpp

@@ -9,6 +9,9 @@
 
 namespace inja {
 
+/*!
+ * \brief The main inja Template.
+ */
 struct Template {
   std::vector<Bytecode> bytecodes;
   std::string content;

include/inja/token.hpp

@@ -6,6 +6,9 @@
 
 namespace inja {
 
+/*!
+ * \brief Helper-class for the inja Parser.
+ */
 struct Token {
   enum class Kind {
     Text,