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{ "id": 16031, "url": "https://patchwork.libcamera.org/api/1.1/patches/16031/?format=api", "web_url": "https://patchwork.libcamera.org/patch/16031/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/1.1/projects/1/?format=api", "name": "libcamera", "link_name": "libcamera", "list_id": "libcamera_core", "list_email": "libcamera-devel@lists.libcamera.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20220524225816.6830-6-laurent.pinchart@ideasonboard.com>", "date": "2022-05-24T22:58:09", "name": "[libcamera-devel,RFC,05/12] libcamera: yaml_parser: Add iterator API", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": false, "hash": "87824b2f356ec98eb8dbbe0c689565aa29ecc306", "submitter": { "id": 2, "url": "https://patchwork.libcamera.org/api/1.1/people/2/?format=api", "name": "Laurent Pinchart", "email": "laurent.pinchart@ideasonboard.com" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/16031/mbox/", "series": [ { "id": 3135, "url": "https://patchwork.libcamera.org/api/1.1/series/3135/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=3135", "date": "2022-05-24T22:58:04", "name": "Replace boost JSON parser with libyaml in Raspberry Pi IPA", "version": 1, "mbox": "https://patchwork.libcamera.org/series/3135/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/16031/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/16031/checks/", "tags": {}, "headers": { "Return-Path": "<libcamera-devel-bounces@lists.libcamera.org>", "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 45472C326D\n\tfor <parsemail@patchwork.libcamera.org>;\n\tTue, 24 May 2022 22:58:34 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 980706567F;\n\tWed, 25 May 2022 00:58:32 +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 874E160416\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tWed, 25 May 2022 00:58:27 +0200 (CEST)", "from pendragon.ideasonboard.com (ip-109-40-241-133.web.vodafone.de\n\t[109.40.241.133])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id E3EA9102E;\n\tWed, 25 May 2022 00:58:26 +0200 (CEST)" ], "DKIM-Signature": [ "v=1; 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dkim=pass (1024-bit key; \n\tunprotected) header.d=ideasonboard.com\n\theader.i=@ideasonboard.com\n\theader.b=\"OPKL63MZ\"; dkim-atps=neutral", "To": "libcamera-devel@lists.libcamera.org", "Date": "Wed, 25 May 2022 01:58:09 +0300", "Message-Id": "<20220524225816.6830-6-laurent.pinchart@ideasonboard.com>", "X-Mailer": "git-send-email 2.35.1", "In-Reply-To": "<20220524225816.6830-1-laurent.pinchart@ideasonboard.com>", "References": "<20220524225816.6830-1-laurent.pinchart@ideasonboard.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Subject": "[libcamera-devel] [RFC PATCH 05/12] libcamera: yaml_parser: Add\n\titerator API", "X-BeenThere": "libcamera-devel@lists.libcamera.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "<libcamera-devel.lists.libcamera.org>", "List-Unsubscribe": "<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>", "List-Archive": "<https://lists.libcamera.org/pipermail/libcamera-devel/>", "List-Post": "<mailto:libcamera-devel@lists.libcamera.org>", "List-Help": "<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>", "List-Subscribe": "<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>", "From": "Laurent Pinchart via libcamera-devel\n\t<libcamera-devel@lists.libcamera.org>", "Reply-To": "Laurent Pinchart <laurent.pinchart@ideasonboard.com>", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "content": "Allow using range-based for loops over YamlObject instances by\nimplementing iterators. New YamlObject::DictAdapter and\nYamlObject::ListAdapter adapter classes are introduced to provide\ndifferent iterators depending on the object type.\n\nSigned-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>\n---\n include/libcamera/internal/yaml_parser.h | 115 ++++++++++++++++++++++-\n src/libcamera/yaml_parser.cpp | 37 ++++++++\n 2 files changed, 150 insertions(+), 2 deletions(-)", "diff": "diff --git a/include/libcamera/internal/yaml_parser.h b/include/libcamera/internal/yaml_parser.h\nindex be5f0914703f..22ed87efdf8f 100644\n--- a/include/libcamera/internal/yaml_parser.h\n+++ b/include/libcamera/internal/yaml_parser.h\n@@ -7,6 +7,7 @@\n \n #pragma once\n \n+#include <iterator>\n #include <map>\n #include <string>\n #include <vector>\n@@ -22,7 +23,114 @@ class YamlParserContext;\n \n class YamlObject\n {\n+private:\n+\tusing DictContainer = std::map<std::string, std::unique_ptr<YamlObject>>;\n+\tusing ListContainer = std::vector<std::unique_ptr<YamlObject>>;\n+\n public:\n+#ifndef __DOXYGEN__\n+\ttemplate<typename Container, typename Derived>\n+\tclass Iterator\n+\t{\n+\tpublic:\n+\t\tusing difference_type = std::ptrdiff_t;\n+\t\tusing iterator_category = std::bidirectional_iterator_tag;\n+\n+\t\tIterator(typename Container::const_iterator it)\n+\t\t\t: it_(it)\n+\t\t{\n+\t\t}\n+\n+\t\tDerived &operator++()\n+\t\t{\n+\t\t\t++it_;\n+\t\t\treturn *static_cast<Derived *>(this);\n+\t\t}\n+\n+\t\tDerived operator++(int)\n+\t\t{\n+\t\t\tDerived it = *static_cast<Derived *>(this);\n+\t\t\tit_++;\n+\t\t\treturn it;\n+\t\t}\n+\n+\t\tfriend bool operator==(const Iterator &a, const Iterator &b)\n+\t\t{\n+\t\t\treturn a.it_ == b.it_;\n+\t\t}\n+\n+\t\tfriend bool operator!=(const Iterator &a, const Iterator &b)\n+\t\t{\n+\t\t\treturn a.it_ != b.it_;\n+\t\t}\n+\n+\tprotected:\n+\t\ttypename Container::const_iterator it_;\n+\t};\n+\n+\ttemplate<typename Container, typename Iterator>\n+\tclass Adapter\n+\t{\n+\tpublic:\n+\t\tAdapter(const Container &container)\n+\t\t\t: container_(container)\n+\t\t{\n+\t\t}\n+\n+\t\tIterator begin() const\n+\t\t{\n+\t\t\treturn Iterator{ container_.begin() };\n+\t\t}\n+\n+\t\tIterator end() const\n+\t\t{\n+\t\t\treturn Iterator{ container_.end() };\n+\t\t}\n+\n+\tprotected:\n+\t\tconst Container &container_;\n+\t};\n+\n+\tclass ListIterator : public Iterator<ListContainer, ListIterator>\n+\t{\n+\tpublic:\n+\t\tusing value_type = const YamlObject &;\n+\t\tusing pointer = const YamlObject *;\n+\t\tusing reference = value_type;\n+\n+\t\tvalue_type operator*() const\n+\t\t{\n+\t\t\treturn *it_->get();\n+\t\t}\n+\n+\t\tpointer operator->() const\n+\t\t{\n+\t\t\treturn it_->get();\n+\t\t}\n+\t};\n+\n+\tclass DictIterator : public Iterator<DictContainer, DictIterator>\n+\t{\n+\tpublic:\n+\t\tusing value_type = std::pair<const std::string &, const YamlObject &>;\n+\t\tusing pointer = value_type *;\n+\t\tusing reference = value_type &;\n+\n+\t\tvalue_type operator*() const\n+\t\t{\n+\t\t\treturn { it_->first, *it_->second.get() };\n+\t\t}\n+\t};\n+\n+\tclass DictAdapter : public Adapter<DictContainer, DictIterator>\n+\t{\n+\t};\n+\n+\tclass ListAdapter : public Adapter<ListContainer, ListIterator>\n+\t{\n+\t};\n+#endif /* __DOXYGEN__ */\n+\n \tYamlObject();\n \t~YamlObject();\n \n@@ -55,6 +163,9 @@ public:\n #endif\n \tT get(const T &defaultValue, bool *ok = nullptr) const;\n \n+\tDictAdapter asDict() const { return DictAdapter{ dictionary_ }; }\n+\tListAdapter asList() const { return ListAdapter{ list_ }; }\n+\n \tconst YamlObject &operator[](std::size_t index) const;\n \n \tbool contains(const std::string &key) const;\n@@ -75,8 +186,8 @@ private:\n \tType type_;\n \n \tstd::string value_;\n-\tstd::vector<std::unique_ptr<YamlObject>> list_;\n-\tstd::map<const std::string, std::unique_ptr<YamlObject>> dictionary_;\n+\tListContainer list_;\n+\tDictContainer dictionary_;\n };\n \n class YamlParser final\ndiff --git a/src/libcamera/yaml_parser.cpp b/src/libcamera/yaml_parser.cpp\nindex 85f6694f5fde..a156df36e222 100644\n--- a/src/libcamera/yaml_parser.cpp\n+++ b/src/libcamera/yaml_parser.cpp\n@@ -259,6 +259,43 @@ Size YamlObject::get(const Size &defaultValue, bool *ok) const\n \n #endif /* __DOXYGEN__ */\n \n+/**\n+ * \\fn YamlObject::asDict() const\n+ * \\brief Wrap a dictionary YamlObject in an adapter that exposes iterators\n+ *\n+ * The YamlObject class doesn't directly implement iterators, as the iterator\n+ * type depends on whether the object is a Dictionary or List. This function\n+ * wraps a YamlObject of Dictionary type into an adapter that exposes\n+ * iterators, as well as begin() and end() functions, allowing usage of\n+ * range-based for loops with YamlObject.\n+ *\n+ * The iterator's value_type is a\n+ * <em>std::pair<const std::string &, const \\ref YamlObject &></em>.\n+ *\n+ * If the YamlObject is not of Dictionary type, the returned adapter operates\n+ * as an empty container.\n+ *\n+ * \\return An adapter of unspecified type compatible with range-based for loops\n+ */\n+\n+/**\n+ * \\fn YamlObject::asList() const\n+ * \\brief Wrap a list YamlObject in an adapter that exposes iterators\n+ *\n+ * The YamlObject class doesn't directly implement iterators, as the iterator\n+ * type depends on whether the object is a Dictionary or List. This function\n+ * wraps a YamlObject of List type into an adapter that exposes iterators, as\n+ * well as begin() and end() functions, allowing usage of range-based for loops\n+ * with YamlObject.\n+ *\n+ * The iterator's value_type is a <em>const YamlObject &</em>.\n+ *\n+ * If the YamlObject is not of List type, the returned adapter operates as an\n+ * empty container.\n+ *\n+ * \\return An adapter of unspecified type compatible with range-based for loops\n+ */\n+\n /**\n * \\fn YamlObject::operator[](std::size_t index) const\n * \\brief Retrieve the element from list YamlObject by index\n", "prefixes": [ "libcamera-devel", "RFC", "05/12" ] }