[MOD/WIP] Mess a bit with the XEP-0393 parser

It took a comical amount of time for me to do that LMAO

src/include/StringSplit.h

@@ -1,6 +1,7 @@
 #ifndef PARSEE_STRINGSPLIT_H
 #define PARSEE_STRINGSPLIT_H
 
+#include <stdbool.h>
 #include <stdlib.h>
 
 /* Represents a boundary in a linesplit string */
@@ -32,6 +33,29 @@ extern size_t StrLines(char **split);
 /* Creates a full zone covering every part of the split */
 extern StringRect StrFullRect(char **split);
 
-extern char Str
+/**
+ * Retrieves a character from a string rectview, or \0 if out of bounds.
+ * --------------
+ * Returns: A character at {line}, {col} in C-indices | '\0'
+ * Modifies: NOTHING */
+extern char StrGet(StringRect rect, int line, int col);
 
+/**
+ * Retrieves a line from a string rectview, or a NULL one
+ * --------------
+ * Returns: A stringview that lives along the original
+ * Modifies: NOTHING */
+extern StringRect StrGetl(StringRect rect, int line, bool extend);
+
+/**
+ * Returns a new stringrect, shifted by N chars.
+ * --------------
+ * Returns: A stringview that lives along the original
+ * Modifies: NOTHING */
+extern StringRect StrShift(StringRect rect, int n);
+
+extern size_t StrViewLines(StringRect);
+extern size_t StrViewChars(StringRect, int line);
+
+extern void PrintRect(StringRect rect);
 #endif

src/include/XEP393.h

@@ -7,9 +7,11 @@ typedef enum XEP393Type {
     XEP393_ROOT,
     XEP393_ITALIC,
     XEP393_EMPH,
+    XEP393_SRKE,
     XEP393_MONO,
     XEP393_TEXT,
     XEP393_QUOT,
+    XEP393_LINE,
     XEP393_NL
 } XEP393Type;
 typedef struct XEP393Element {