add lexbor and get math vals

CMakeLists.txt

@@ -35,8 +35,13 @@ FetchContent_Declare(tinyxml2
     GIT_REPOSITORY "https://github.com/leethomason/tinyxml2"
 )
 
+FetchContent_Declare(lexbor
+    GIT_REPOSITORY "https://github.com/lexbor/lexbor"
+)
+
 FetchContent_MakeAvailable(spdlog)
 FetchContent_MakeAvailable(tinyxml2)
+FetchContent_MakeAvailable(lexbor)
 
 if(NOT TARGET tinyxml2)
     # Stand-alone build
@@ -48,6 +53,10 @@ if(NOT TARGET spdlog)
     find_package(spdlog REQUIRED)
 endif()
 
+if(NOT TARGET spdlog)
+    # Stand-alone build
+    find_package(lexbor REQUIRED)
+endif()
 
 ADD_EXECUTABLE(stgen3  util.cpp darkhttpd.c duktape/src/duktape.c markdown.cpp main.cpp)
 
@@ -62,5 +71,6 @@ add_custom_command(
 
 target_link_libraries(stgen3 PRIVATE ${CMAKE_SOURCE_DIR}/MultiMarkdown/build/libMultiMarkdown.a)
 target_link_libraries(stgen3 PRIVATE tinyxml2)
+target_link_libraries(stgen3 PRIVATE lexbor)
 
 install(TARGETS stgen3)

main.cpp

@@ -32,6 +32,14 @@
 #include "markdown.h"
 #include "templater.hpp"
 
+extern "C" {
+namespace lex {
+#include <lexbor/dom/dom.h>
+#include "lexbor_base.h"
+
+};
+}
+
 
 const std::string SITE_CONFIG_FNAME = "stgen.json";
 const std::string DEFAULT_PUBLISH_ROOT = "public";
@@ -321,6 +329,50 @@ class builder {
      }
 
 
+     void postprocess_math(const std::string &html_text) {
+         using namespace lex;
+
+         lxb_html_document_t *document = 
+             parse((const unsigned char *)html_text.c_str(), html_text.length());
+
+
+         lxb_dom_collection_t *collection = 
+             lxb_dom_collection_make(&document->dom_document, 128);
+
+         if (collection == nullptr) {
+             spdlog::warn("failed to parse html?");
+             // messy
+             return;
+         }
+
+
+         auto err = lxb_dom_elements_by_class_name(
+                 lxb_dom_interface_element(document->body),
+                  collection, (const lxb_char_t *) "math", 4);
+
+
+         if (err != LXB_STATUS_OK) {
+             spdlog::warn("failed to parse html?");
+             return;
+         }
+
+         for (size_t i = 0; i < lxb_dom_collection_length(collection); i++) {
+            lxb_dom_element_t *element = lxb_dom_collection_element(collection, i);
+            //serialize_node(lxb_dom_interface_node(element));
+            size_t len;
+            lxb_char_t *text = lxb_dom_node_text_content(&element->node, &len);
+            const std::string tt {(const char *)text, (const char *)text + len};
+            std::string mathtext = dukengine.eval_katex(tt);
+            spdlog::warn("math text: {}", mathtext);
+            
+        }
+
+        lxb_dom_collection_destroy(collection, true);
+        lxb_html_document_destroy(document);
+
+     }
+
+
      /** BRoken and ridiculous and wont work why did i write this. */
      std::string replace_math(const std::string &text) {
 
@@ -651,9 +703,8 @@ class builder {
                 auto job_t = job_type::TEMPLATE;
 
                 if (ext == "md" || ext == "markdown") {
-                    replace_math(text);
                     text = parser.parse_to_html(text); 
-//                    text = postprocess_js(text);
+                    postprocess_math(text);
 
                 }