Merge GCC frontend into the branch

frontend/dependency.cc

@@ -0,0 +1,102 @@
+/* Dependency graph analysis.
+   Copyright (C) 2025 Free Software Foundation, Inc.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "elna/frontend/dependency.h"
+
+#include <fstream>
+#include <sstream>
+#include <string.h>
+
+#include "elna/frontend/driver.h"
+#include "elna/frontend/semantic.h"
+#include "parser.hh"
+
+namespace elna::frontend
+{
+    dependency::dependency(const char *path)
+        : error_container(path)
+    {
+    }
+
+    dependency read_source(std::istream& entry_point, const char *entry_path)
+    {
+        driver parse_driver{ entry_path };
+        lexer tokenizer(entry_point);
+        yy::parser parser(tokenizer, parse_driver);
+
+        dependency outcome{ entry_path };
+        if (parser())
+        {
+            std::swap(outcome.errors(), parse_driver.errors());
+            return outcome;
+        }
+        else
+        {
+            std::swap(outcome.tree, parse_driver.tree);
+        }
+        declaration_visitor declaration_visitor(entry_path);
+        outcome.tree->accept(&declaration_visitor);
+
+        if (!declaration_visitor.errors().empty())
+        {
+            std::swap(outcome.errors(), declaration_visitor.errors());
+        }
+        outcome.unresolved = declaration_visitor.unresolved;
+
+        return outcome;
+    }
+
+    error_list analyze_semantics(const char *path, std::unique_ptr<unit>& tree, symbol_bag bag)
+    {
+        name_analysis_visitor name_analyser(path, bag);
+        tree->accept(&name_analyser);
+
+        if (name_analyser.has_errors())
+        {
+            return std::move(name_analyser.errors());
+        }
+        type_analysis_visitor type_analyzer(path, bag);
+        tree->accept(&type_analyzer);
+
+        if (type_analyzer.has_errors())
+        {
+            return std::move(type_analyzer.errors());
+        }
+        return error_list{};
+    }
+
+    std::filesystem::path build_path(const std::vector<std::string>& segments)
+    {
+        std::filesystem::path result;
+        std::vector<std::string>::const_iterator segment_iterator = std::cbegin(segments);
+
+        if (segment_iterator == std::cend(segments))
+        {
+            return result;
+        }
+        result = *segment_iterator;
+
+        ++segment_iterator;
+        for (; segment_iterator != std::cend(segments); ++segment_iterator)
+        {
+            result /= *segment_iterator;
+        }
+        result.replace_extension(".elna");
+
+        return result;
+    }
+}