From 452884a74c2e281412e460da97ea85a6a3988c48 Mon Sep 17 00:00:00 2001
From: TopchetoEU <36534413+TopchetoEU@users.noreply.github.com>
Date: Tue, 4 Oct 2022 20:36:30 +0300
Subject: [PATCH] feat: implement group parser

---
 src/compiler/treeifier/parsers/group.cc | 43 +++++++++++++++++++++++--
 1 file changed, 41 insertions(+), 2 deletions(-)

diff --git a/src/compiler/treeifier/parsers/group.cc b/src/compiler/treeifier/parsers/group.cc
index 0a6e26e..979c49d 100644
--- a/src/compiler/treeifier/parsers/group.cc
+++ b/src/compiler/treeifier/parsers/group.cc
@@ -1,11 +1,50 @@
 #include "compiler/treeifier/ast.hh"
+#include "compiler/treeifier/tokenizer.hh"
+#include "compiler/treeifier/ast/helper.hh"
 #include <algorithm>
 
+using namespace ppc::comp::tree;
 using namespace ppc::comp::tree::ast;
 using namespace std::string_literals;
 
+static bool read_nmsp(ast_ctx_t &ctx, size_t &i, const lang::namespace_name_t &name) {
+    tree_helper_t h(ctx, i);
+
+    size_t equal_i = 0;
+
+    while (true) {
+        if (h.ended()) break;
+        if (equal_i >= name.size()) return false;
+        auto &curr = h.curr();
+        if (!curr.is_identifier()) return false;
+
+        if (name[equal_i] != curr.identifier()) return false;
+
+        if (h.try_advance() && h.curr().is_operator(operator_t::DOUBLE_COLON)) {
+            equal_i++;
+        }
+        else break;
+    }
+
+    return equal_i != name.size();
+}
+
 bool group_parser_t::parse(ast_ctx_t &ctx, size_t &i, data::map_t &out) const {
-    return false;
+    tree_helper_t h(ctx, i);
+
+    for (auto &pair : named_parsers) {
+        if (!read_nmsp(ctx, i, pair.first)) continue;
+        auto &parser = *pair.second;
+        return h.parse(parser, out);
+    }
+    for (auto parser : parsers) {
+        try {
+            return h.parse(*parser, out);
+        }
+        catch (std::string) {
+            return false;
+        }
+    }
 }
 
 
@@ -14,7 +53,7 @@ group_parser_t &group_parser_t::add(parser_t &parser) {
     return *this;
 }
 group_parser_t &group_parser_t::add(parser_t &parser, const lang::namespace_name_t &name) {
-    if (name.is_empty()) throw "Name can't be empty."s;
+    if (name.empty()) throw "Name can't be empty."s;
     if (std::find(parsers.begin(), parsers.end(), &parser) != parsers.end()) {
         throw "Parser '" + name.to_string() + "' already in group.";
     }