TOML storage plugin

.cirrus.yml

@@ -45,6 +45,7 @@ bsd_task:
       pkg install -y
       bison
       cmake
+      flex
       git
       libgit2
       ninja
@@ -125,6 +126,7 @@ mac_task:
       brew install dbus
       brew install discount
       brew install doxygen
+      brew install flex
       brew install glib
       brew install go
       brew install gpgme

.travis.yml

@@ -163,6 +163,7 @@ matrix:
             - bison
             - dbus
             - discount
+            - flex
             - gpgme
             - libev
             - libgcrypt

doc/METADATA.ini

@@ -1314,3 +1314,14 @@ status = implemented
 usedby/plugins = cache
 type = boolean
 description = tells the cache plugin to remove all cache files during the next `kdbGet` in a safe way.
+
+[tomltype]
+status = implemented
+usedby/plugins = toml
+type = enum
+	simpletable
+	tablearray
+	inlinetable
+descriptions = Tells the TOML plugin, which kind of TOML structure a key represents. When reading a TOML file, the plugin sets this metakey when encountering a TOML structure.
+	On writing, it is used for writing the structure back into a TOML file.
+	No metakey inference is done on writing, it's either set by a previous read of a TOML file or set explicitly by the user.

doc/man/man7/elektra-plugins.7

@@ -197,6 +197,9 @@ passwd \fIpasswd/\fR for passwd files
 specload \fIspecload/\fR calls an external application to request its specification, depends on quickdump \fIquickdump/\fR
 .
 .IP "\(bu" 4
+toml \fItoml/\fR reads and writes data using a parser generated by Flex \fIhttps://github\.com/westes/flex\fR and Bison \fIhttps://www\.gnu\.org/software/bison\fR
+.
+.IP "\(bu" 4
 yamlcpp \fIyamlcpp/\fR reads and writes data in the YAML \fIhttp://www\.yaml\.org\fR format using yaml\-cpp \fIhttps://github\.com/jbeder/yaml\-cpp\fR
 .
 .IP "\(bu" 4

doc/news/_preparation_next_release.md

@@ -51,11 +51,9 @@ The following section lists news about the [modules](https://www.libelektra.org/
 - <<TODO>>
 - <<TODO>>
 
-### <<Plugin2>>
+### TOML
 
-- <<TODO>>
-- <<TODO>>
-- <<TODO>>
+- Added the TOML plugin, which can read and write TOML files using flex and bison. _(Jakob Fischer)_
 
 ### <<Plugin3>>
 

scripts/docker/alpine/3.11/Dockerfile

@@ -8,6 +8,7 @@ RUN apk update \
         curl \
         diffutils \
         file \
+        flex \
         git \
         gtest-dev \
         ninja \

scripts/docker/cirrus/fedora/Dockerfile

@@ -2,13 +2,15 @@ FROM fedora:32
 
 RUN dnf upgrade -y && dnf install -y \
         augeas-devel \
+        bison \
         boost-devel \
         cmake \
         curl \
         dbus-devel \
         diffutils \
         file \
         findutils \
+        flex \
         gcc-c++ \
         git \
         glib2 \
@@ -49,4 +51,3 @@ RUN mkdir -p ${GTEST_ROOT} \
       -L https://github.com/google/googletest/archive/${GTEST_VER}.tar.gz \
     && tar -zxvf gtest.tar.gz --strip-components=1 -C ${GTEST_ROOT} \
     && rm gtest.tar.gz
-

scripts/docker/debian/buster/Dockerfile

@@ -10,6 +10,8 @@ RUN apt-get update \
         automake \
         autotools-dev \
         bison \
+        flex \
+        libc6-dbg \
         build-essential \
         cmake \
         curl \

scripts/docker/debian/sid/Dockerfile

@@ -18,6 +18,8 @@ RUN apt-get update && apt-get -y install \
         default-jdk \
         dh-lua \
         ed \
+        flex \
+        libc6-dbg \
         gawk \
         git \
         gnupg2 \

scripts/docker/debian/stretch/Dockerfile

@@ -70,6 +70,7 @@ RUN apt-get update \
         dnsutils \
         virtualenv \
         bison \
+        flex \
         uuid-dev \
         ninja-build \
     && rm -rf /var/lib/apt/lists/*
@@ -172,4 +173,3 @@ RUN virtualenv "${COVERALLS_VIRTUALENV_PATH}" \
     && pip install cpp-coveralls \
     && deactivate
 ENV PATH="${PATH}:${COVERALLS_VIRTUALENV_PATH}/bin"
-

scripts/docker/ubuntu/disco/Dockerfile

@@ -8,6 +8,7 @@ RUN apt-get update && apt-get -y install \
         cmake \
         curl \
         ed \
+        flex \
         git \
         googletest \
         libantlr4-runtime-dev \

scripts/vagrant/ubuntu/artful32/Vagrantfile

@@ -80,7 +80,7 @@ Vagrant.configure("2") do |config|
   config.vm.provision "shell", inline: <<-SHELL
     apt-get update
     apt-get -y upgrade
-    apt-get -y install curl build-essential autotools-dev automake cmake pkg-config doxygen graphviz bison ruby-dev python-dev python3-dev liblua5.2-dev tclcl-dev libaugeas-dev libyajl-dev libgit2-dev libboost-all-dev libssl-dev libcurl4-gnutls-dev libdbus-1-dev libpcre3-dev libpcre++-dev checkinstall vim valgrind clang-5.0 clang-format-5.0 htop zlib1g-dev git openjdk-8-jdk python-pip locales bison libpython3-dev liblua5.3-dev libxerces-c-dev swig
+    apt-get -y install curl build-essential autotools-dev automake cmake pkg-config doxygen graphviz bison flex ruby-dev python-dev python3-dev liblua5.2-dev tclcl-dev libaugeas-dev libyajl-dev libgit2-dev libboost-all-dev libssl-dev libcurl4-gnutls-dev libdbus-1-dev libpcre3-dev libpcre++-dev checkinstall vim valgrind clang-5.0 clang-format-5.0 htop zlib1g-dev git openjdk-8-jdk python-pip locales bison libpython3-dev liblua5.3-dev libxerces-c-dev swig
 
     pip install cmake-format[yaml]==0.6.3
 

src/libs/meta/meta.c

@@ -873,31 +873,38 @@ int keySetCTime (Key * key, time_t ctime)
 int elektraKeyCmpOrder (const Key * ka, const Key * kb)
 {
 
-	if (!ka && !kb) return 0;
-
-	if (ka && !kb) return 1;
+	if (ka == NULL && kb == NULL)
+	{
+		return 0;
+	}
 
-	if (!ka && kb) return -1;
+	if (ka != NULL && kb == NULL)
+	{
+		return 1;
+	}
 
-	int aorder = -1;
-	int border = -1;
+	if (ka == NULL && kb != NULL)
+	{
+		return -1;
+	}
 
 	const Key * kam = keyGetMeta (ka, "order");
 	const Key * kbm = keyGetMeta (kb, "order");
 
-	if (kam) aorder = atoi (keyString (kam));
-	if (kbm) border = atoi (keyString (kbm));
-
-	if (aorder > 0 && border > 0) return aorder - border;
-
-	if (aorder < 0 && border < 0) return 0;
-
-	if (aorder < 0 && border >= 0) return -1;
-
-	if (aorder >= 0 && border < 0) return 1;
+	if (kam == NULL && kbm == NULL)
+	{
+		return 0;
+	}
+	if (kam != NULL && kbm == NULL)
+	{
+		return 1;
+	}
+	if (kam == NULL && kbm != NULL)
+	{
+		return -1;
+	}
 
-	/* cannot happen anyway */
-	return 0;
+	return atoi (keyString (kam)) - atoi (keyString (kbm));
 }
 
 

src/plugins/README.md

@@ -120,6 +120,7 @@ productive use:
 - [mozprefs](mozprefs/) for Mozilla preference files
 - [passwd](passwd/) for passwd files
 - [specload](specload/) calls an external application to request its specification, depends on [quickdump](quickdump/)
+- [toml](toml/) reads and writes data using a parser generated by [Flex](https://github.com/westes/flex) and [Bison](https://www.gnu.org/software/bison)
 - [yamlcpp](yamlcpp/) reads and writes data in the [YAML][] format using [yaml-cpp](https://github.com/jbeder/yaml-cpp)
 - [yanlr](yanlr/) reads data using a parser generated by [ANTLR](http://www.antlr.org)
 

src/plugins/toml/CMakeLists.txt

@@ -0,0 +1,152 @@
+function (check_dependencies)
+	set (
+		FOUND_DEPENDENCIES
+		FALSE
+		PARENT_SCOPE)
+
+	set (USE_HOMEBREW_FLEX ${APPLE} AND EXISTS /usr/local/opt/flex)
+	if (USE_HOMEBREW_FLEX)
+		list (APPEND CMAKE_PREFIX_PATH "/usr/local/opt/flex")
+	endif (USE_HOMEBREW_FLEX)
+	find_package (FLEX 2.6.2 QUIET)
+
+	set (USE_HOMEBREW_BISON ${APPLE} AND EXISTS /usr/local/opt/bison)
+	if (USE_HOMEBREW_BISON)
+		list (APPEND CMAKE_PREFIX_PATH "/usr/local/opt/bison")
+	endif (USE_HOMEBREW_BISON)
+	find_package (BISON 3 QUIET)
+
+	if ((NOT FLEX_FOUND) AND (NOT BISON_FOUND))
+		set (
+			FAILURE_MESSAGE
+			"Flex and Bison could not be found"
+			PARENT_SCOPE)
+		return ()
+	endif ((NOT FLEX_FOUND) AND (NOT BISON_FOUND))
+	if (NOT FLEX_FOUND)
+		set (
+			FAILURE_MESSAGE
+			"Flex could not be found"
+			PARENT_SCOPE)
+		return ()
+	endif (NOT FLEX_FOUND)
+	if (NOT BISON_FOUND)
+		set (
+			FAILURE_MESSAGE
+			"Bison could not be found"
+			PARENT_SCOPE)
+		return ()
+	endif (NOT BISON_FOUND)
+
+	set (
+		FOUND_DEPENDENCIES
+		TRUE
+		PARENT_SCOPE)
+endfunction (check_dependencies)
+
+function (generate_code)
+	set (
+		GENERATED_CODE
+		FALSE
+		PARENT_SCOPE)
+
+	flex_target (TOMLScanner ${CMAKE_CURRENT_SOURCE_DIR}/lexer.l ${CMAKE_CURRENT_BINARY_DIR}/lexer.c)
+	bison_target (TOMLParser ${CMAKE_CURRENT_SOURCE_DIR}/parser.y ${CMAKE_CURRENT_BINARY_DIR}/parser.c VERBOSE bison_verbose.txt)
+	add_flex_bison_dependency (TOMLScanner TOMLParser)
+
+	if ((NOT FLEX_TOMLScanner_DEFINED) AND (NOT BISON_TOMLParser_DEFINED))
+		set (
+			FAILURE_MESSAGE
+			"Flex and Bison code could not be generated"
+			PARENT_SCOPE)
+		return ()
+	endif ((NOT FLEX_TOMLScanner_DEFINED) AND (NOT BISON_TOMLParser_DEFINED))
+	if (NOT FLEX_TOMLScanner_DEFINED)
+		set (
+			FAILURE_MESSAGE
+			"Flex code could not be generated"
+			PARENT_SCOPE)
+		return ()
+	endif (NOT FLEX_TOMLScanner_DEFINED)
+	if (NOT BISON_TOMLParser_DEFINED)
+		set (
+			FAILURE_MESSAGE
+			"Bison code could not be generated"
+			PARENT_SCOPE)
+		return ()
+	endif (NOT BISON_TOMLParser_DEFINED)
+
+	set (
+		FLEX_OUTPUT_SOURCE
+		${FLEX_TOMLScanner_OUTPUTS}
+		PARENT_SCOPE)
+	set (
+		FLEX_OUTPUT_HEADER
+		${FLEX_TOMLScanner_OUTPUT_HEADER}
+		PARENT_SCOPE)
+	set (
+		BISON_OUTPUT_SOURCE
+		${BISON_TOMLParser_OUTPUT_SOURCE}
+		PARENT_SCOPE)
+	set (
+		BISON_OUTPUT_HEADER
+		${BISON_TOMLParser_OUTPUT_HEADER}
+		PARENT_SCOPE)
+
+	set (
+		GENERATED_CODE
+		TRUE
+		PARENT_SCOPE)
+
+endfunction (generate_code)
+
+if (DEPENDENCY_PHASE)
+
+	check_dependencies ()
+	if (NOT FOUND_DEPENDENCIES)
+		remove_plugin (toml ${FAILURE_MESSAGE})
+	else (NOT FOUND_DEPENDENCIES)
+		generate_code ()
+		if (NOT GENERATED_CODE)
+			remove_plugin (toml ${FAILURE_MESSAGE})
+		endif (NOT GENERATED_CODE)
+	endif (NOT FOUND_DEPENDENCIES)
+
+	set (
+		SOURCE_FILES
+		toml.h
+		toml.c
+		driver.h
+		driver.c
+		scalar.h
+		scalar.c
+		table_array.h
+		table_array.c
+		comment_list.h
+		comment_list.c
+		codepoint.h
+		codepoint.c
+		utility.h
+		utility.c
+		write.h
+		write.c
+		node.h
+		node.c
+		prepare.c
+		prepare.h
+		type.h
+		type.c
+		error.h
+		error.c
+		${FLEX_OUTPUT_HEADER}
+		${FLEX_OUTPUT_SOURCE}
+		${BISON_OUTPUT_HEADER}
+		${BISON_OUTPUT_SOURCE})
+
+endif (DEPENDENCY_PHASE)
+
+add_plugin (
+	toml ADD_TEST INSTALL_TEST_DATA
+	LINK_ELEKTRA elektra-meta
+	SOURCES ${SOURCE_FILES}
+	INCLUDE_DIRECTORIES ${CMAKE_CURRENT_SOURCE_DIR})