patterns: Rewrite evaluation engine (#306)

* patterns: Rewrite most of the evaluator to mainly use polymorphism instead of just RTTI

* patterns: Fixed a couple of AST memory leaks

* patterns: Parse string operations correctly

* patterns: Various fixes and cleanup

* patterns: Implement primitive function definitions

Function parameters now need to provide their type in the definition

* patterns: Added function variable definition and assignment

* patterns: Added remaining function statements

* patterns: Added unsized and while-sized arrays

* patterns: Added multi variable declarations to functions

* patterns: Added std::format built-in function

* patterns: Allow passing custom types to functions

* patterns: Added attributes and new "format" attribute

* patterns: Use libfmt for std::print instead of custom version

* patterns: Remove unnecessary string compare function

* pattern: Fix preprocessor directives

* patterns: Fix unit tests

* patterns: Added cast expression

* patterns: Handle endianess in function parameters

* patterns: Added casting to different endian

* patterns: Added 'str' type for functions

plugins/libimhex/source/pattern_language/preprocessor.cpp

@@ -25,8 +25,9 @@ namespace hex::pl {
         output.reserve(code.length());
 
         try {
+            bool startOfLine = true;
             while (offset < code.length()) {
-                if (code[offset] == '#') {
+                if (code[offset] == '#' && startOfLine) {
                     offset += 1;
 
                     if (code.substr(offset, 7) == "include") {
@@ -164,8 +165,11 @@ namespace hex::pl {
                         throwPreprocessorError("unterminated comment", lineNumber - 1);
                 }
 
-                if (code[offset] == '\n')
+                if (code[offset] == '\n') {
                     lineNumber++;
+                    startOfLine = true;
+                } else if (!std::isspace(code[offset]))
+                    startOfLine = false;
 
                 output += code[offset];
                 offset += 1;