{"id":26465,"url":"https://patchwork.libcamera.org/api/1.1/patches/26465/?format=json","web_url":"https://patchwork.libcamera.org/patch/26465/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/1.1/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260407153427.1825999-26-laurent.pinchart@ideasonboard.com>","date":"2026-04-07T15:34:10","name":"[v2,25/42] libcamera: value_node: Support looking up descendant node by path","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"72ddd8d841b7831e07056199c1e17a53cb125575","submitter":{"id":2,"url":"https://patchwork.libcamera.org/api/1.1/people/2/?format=json","name":"Laurent Pinchart","email":"laurent.pinchart@ideasonboard.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/26465/mbox/","series":[{"id":5873,"url":"https://patchwork.libcamera.org/api/1.1/series/5873/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=5873","date":"2026-04-07T15:33:45","name":"libcamera: Global configuration file improvements","version":2,"mbox":"https://patchwork.libcamera.org/series/5873/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/26465/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/26465/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 8F36EC330A\n\tfor ;\n\tTue, 7 Apr 2026 15:35:09 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id BDE8762E0F;\n\tTue, 7 Apr 2026 17:35:08 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id E6DC062DFF\n\tfor ;\n\tTue, 7 Apr 2026 17:35:02 +0200 (CEST)","from killaraus.ideasonboard.com\n\t(2001-14ba-703d-e500--2a1.rev.dnainternet.fi\n\t[IPv6:2001:14ba:703d:e500::2a1])\n\tby perceval.ideasonboard.com (Postfix) with UTF8SMTPSA id 6047A6A6\n\tfor ;\n\tTue, 7 Apr 2026 17:33:35 +0200 (CEST)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"QD2pUbqe\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1775576015;\n\tbh=ciUfVyVHVmbZDdVkctsK/9fbleSWzXsDOR4lyHxsANM=;\n\th=From:To:Subject:Date:In-Reply-To:References:From;\n\tb=QD2pUbqe35StF5JJk1YK/eqQ7+c8Ao8+lZCEepMJe2W31+H0c2mC8bpXyFmLog/Ws\n\tLbTleARGbn3Ut/55bKx5D15gpyp3nHme7RzRZk2xxGKmq5fl2rjI4/5o/FrHanhvgF\n\tnJMs1CAedKAckWGre/weQPkTKzeUnh1rhai4Mb7c=","From":"Laurent Pinchart ","To":"libcamera-devel@lists.libcamera.org","Subject":"[PATCH v2 25/42] libcamera: value_node: Support looking up\n\tdescendant node by path","Date":"Tue, 7 Apr 2026 18:34:10 +0300","Message-ID":"<20260407153427.1825999-26-laurent.pinchart@ideasonboard.com>","X-Mailer":"git-send-email 2.52.0","In-Reply-To":"<20260407153427.1825999-1-laurent.pinchart@ideasonboard.com>","References":"<20260407153427.1825999-1-laurent.pinchart@ideasonboard.com>","MIME-Version":"1.0","Content-Type":"text/plain; charset=UTF-8","Content-Transfer-Encoding":"8bit","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"Looking up a descendant node based on a path is a common operation. Add\na helper function to do so, to avoid loops in the callers.\n\nSigned-off-by: Laurent Pinchart \nReviewed-by: Barnabás Pőcze \n---\nChanges since v1:\n\n- Use reference in range-based for loop\n- Improve commit message\n---\n include/libcamera/internal/value_node.h | 1 +\n src/libcamera/value_node.cpp | 23 +++++++++++++++++++++++\n 2 files changed, 24 insertions(+)","diff":"diff --git a/include/libcamera/internal/value_node.h b/include/libcamera/internal/value_node.h\nindex be28c2b73832..14c5e0eb0202 100644\n--- a/include/libcamera/internal/value_node.h\n+++ b/include/libcamera/internal/value_node.h\n@@ -237,6 +237,7 @@ public:\n \tbool contains(std::string_view key) const;\n \tValueNode *at(std::string_view key);\n \tconst ValueNode &operator[](std::string_view key) const;\n+\tconst ValueNode &operator[](std::initializer_list path) const;\n \n \tValueNode *add(std::unique_ptr &&child);\n \tValueNode *add(std::string key, std::unique_ptr &&child);\ndiff --git a/src/libcamera/value_node.cpp b/src/libcamera/value_node.cpp\nindex e8db7ef3c37f..990e46d70358 100644\n--- a/src/libcamera/value_node.cpp\n+++ b/src/libcamera/value_node.cpp\n@@ -488,6 +488,29 @@ const ValueNode &ValueNode::operator[](std::string_view key) const\n \treturn *iter->second;\n }\n \n+/**\n+ * \\brief Retrieve a descendant node by path\n+ * \\param[in] path The path\n+ *\n+ * This function retrieves a descendant of a ValueNode by following a \\a path.\n+ * The path is a list of keys that index nested dictionary nodes. If any node\n+ * along the path is not a Dictionary node, an empty node is returned.\n+ *\n+ * \\return The ValueNode corresponding to the \\a path\n+ */\n+const ValueNode &ValueNode::operator[](std::initializer_list path) const\n+{\n+\tconst ValueNode *node = this;\n+\n+\tfor (const auto &part : path) {\n+\t\tnode = &(*node)[part];\n+\t\tif (!*node)\n+\t\t\treturn empty;\n+\t}\n+\n+\treturn *node;\n+}\n+\n /**\n * \\brief Add a child node to a list\n * \\param[in] child The child node\n","prefixes":["v2","25/42"]}