1 files changed, 144 insertions, 0 deletions
diff --git a/src/md4cpp.hh b/src/md4cpp.hh
new file mode 100644
index 0000000..99d09e0
--- /dev/null
+++ b/src/md4cpp.hh
@@ -0,0 +1,144 @@
+/**
+ * Copyright (c) 2022, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef lnav_md4cpp_hh
+#define lnav_md4cpp_hh
+
+#include <map>
+#include <string>
+#include <unordered_map>
+
+#include "base/intern_string.hh"
+#include "base/result.h"
+#include "mapbox/variant.hpp"
+#include "md4c/md4c.h"
+
+namespace md4cpp {
+
+struct xml_entity {
+    std::string xe_chars;
+};
+
+struct xml_entity_map {
+    std::map<std::string, xml_entity> xem_entities;
+};
+
+struct emoji {
+    std::string e_shortname;
+    std::string e_value;
+};
+
+struct emoji_map {
+    std::vector<emoji> em_emojis;
+    std::unordered_map<std::string, std::reference_wrapper<emoji>>
+        em_shortname2emoji;
+};
+
+class event_handler {
+public:
+    virtual ~event_handler() = default;
+
+    struct block_doc {};
+    struct block_quote {};
+    struct block_hr {};
+    struct block_html {};
+    struct block_p {};
+    struct block_thead {};
+    struct block_tbody {};
+    struct block_tr {};
+    struct block_th {};
+
+    using block = mapbox::util::variant<block_doc,
+                                        block_quote,
+                                        MD_BLOCK_UL_DETAIL*,
+                                        MD_BLOCK_OL_DETAIL*,
+                                        MD_BLOCK_LI_DETAIL*,
+                                        block_hr,
+                                        MD_BLOCK_H_DETAIL*,
+                                        MD_BLOCK_CODE_DETAIL*,
+                                        block_html,
+                                        block_p,
+                                        MD_BLOCK_TABLE_DETAIL*,
+                                        block_thead,
+                                        block_tbody,
+                                        block_tr,
+                                        block_th,
+                                        MD_BLOCK_TD_DETAIL*>;
+
+    virtual Result<void, std::string> enter_block(const block& bl) = 0;
+    virtual Result<void, std::string> leave_block(const block& bl) = 0;
+
+    struct span_em {};
+    struct span_strong {};
+    struct span_code {};
+    struct span_del {};
+    struct span_u {};
+
+    using span = mapbox::util::variant<span_em,
+                                       span_strong,
+                                       MD_SPAN_A_DETAIL*,
+                                       MD_SPAN_IMG_DETAIL*,
+                                       span_code,
+                                       span_del,
+                                       span_u>;
+
+    virtual Result<void, std::string> enter_span(const span& bl) = 0;
+    virtual Result<void, std::string> leave_span(const span& bl) = 0;
+
+    virtual Result<void, std::string> text(MD_TEXTTYPE tt,
+                                           const string_fragment& sf)
+        = 0;
+};
+
+namespace details {
+Result<void, std::string> parse(const string_fragment& sf, event_handler& eh);
+}
+
+template<typename T>
+class typed_event_handler : public event_handler {
+public:
+    virtual T get_result() = 0;
+};
+
+template<typename T>
+Result<T, std::string>
+parse(const string_fragment& sf, typed_event_handler<T>& eh)
+{
+    TRY(details::parse(sf, eh));
+
+    return Ok(eh.get_result());
+}
+
+const xml_entity_map& get_xml_entity_map();
+
+const emoji_map& get_emoji_map();
+
+}  // namespace md4cpp
+
+#endif