Merge pull request godotengine#97218 from wenqiangwang/local_debuggger_expr_evalulation

Add support for `print` command in local (command line `-d`) debugger

Author: Repiteo

core/debugger/local_debugger.cpp

@@ -208,10 +208,10 @@ void LocalDebugger::debug(bool p_can_continue, bool p_is_error_breakpoint) {
 			print_variables(members, values, variable_prefix);
 
 		} else if (line.begins_with("p") || line.begins_with("print")) {
-			if (line.get_slice_count(" ") <= 1) {
-				print_line("Usage: print <expre>");
+			if (line.find_char(' ') < 0) {
+				print_line("Usage: print <expression>");
 			} else {
-				String expr = line.get_slicec(' ', 2);
+				String expr = line.split(" ", true, 1)[1];
 				String res = script_lang->debug_parse_stack_level_expression(current_frame, expr);
 				print_line(res);
 			}

modules/gdscript/gdscript_editor.cpp

@@ -43,6 +43,7 @@
 #include "core/config/engine.h"
 #include "core/core_constants.h"
 #include "core/io/file_access.h"
+#include "core/math/expression.h"
 
 #ifdef TOOLS_ENABLED
 #include "core/config/project_settings.h"
@@ -427,7 +428,30 @@ void GDScriptLanguage::debug_get_globals(List<String> *p_globals, List<Variant>
 }
 
 String GDScriptLanguage::debug_parse_stack_level_expression(int p_level, const String &p_expression, int p_max_subitems, int p_max_depth) {
-	return "";
+	List<String> names;
+	List<Variant> values;
+	debug_get_stack_level_locals(p_level, &names, &values, p_max_subitems, p_max_depth);
+
+	Vector<String> name_vector;
+	for (const String &name : names) {
+		name_vector.push_back(name);
+	}
+
+	Array value_array;
+	for (const Variant &value : values) {
+		value_array.push_back(value);
+	}
+
+	Expression expression;
+	if (expression.parse(p_expression, name_vector) == OK) {
+		ScriptInstance *instance = debug_get_stack_level_instance(p_level);
+		if (instance) {
+			Variant return_val = expression.execute(value_array, instance->get_owner());
+			return return_val.get_construct_string();
+		}
+	}
+
+	return String();
 }
 
 void GDScriptLanguage::get_recognized_extensions(List<String> *p_extensions) const {