Add property-db class to record & write structured data. (#397)

Add property-db class to record & write structured data.

This adds a utility to record structured data in the form of a property database where the keys are a property path with string or number values. The data can be converted to a string, or written to a file, as JSON.

README.adoc

@@ -17,7 +17,7 @@ Continuously tested on:
 * FreeBSD Clang 11, 12, 13, 14, 15, 16, 17
 * FreeBSD GCC 9, 10, 11, 12, 13
 * Linux Clang 3.6, 3.7, 3.8, 3.9, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17
-* Linux GCC 4.7, 4.8, 4.9, 5, 6, 7, 8, 9, 10, 11, 12, 13
+* Linux GCC 4.8, 4.9, 5, 6, 7, 8, 9, 10, 11, 12, 13
 * macOS Xcode 11.7, 12.4, 12.5.1, 13.4.1, 14.0.1, 14.1, 14.2, 14.3.1, 15.0.1
 * Windows MinGW 8.1.0
 * Windows 2015, 2017, 2019, 2022

azure-pipelines.yml

@@ -245,7 +245,7 @@ stages:
         GCC 5: {CXX: g++-5, TOOLSET: gcc-5, PACKAGES: g++-5, CONTAINER: "ubuntu_1804"}
         GCC 4.9: {CXX: g++-4.9, TOOLSET: gcc-4.9, PACKAGES: g++-4.9, CONTAINER: "ubuntu_1604"}
         GCC 4.8: {CXX: g++-4.8, TOOLSET: gcc-4.8, PACKAGES: g++-4.8, CONTAINER: "ubuntu_1804"}
-        GCC 4.7: {CXX: g++-4.7, TOOLSET: gcc-4.7, PACKAGES: g++-4.7, CONTAINER: "ubuntu_1604"}
+        # GCC 4.7: {CXX: g++-4.7, TOOLSET: gcc-4.7, PACKAGES: g++-4.7, CONTAINER: "ubuntu_1604"}
         Clang 9: {CXX: clang++-9, TOOLSET: clang-9, PACKAGES: clang-9, LLVM_VER: 9, LLVM_OS: 'bionic', CONTAINER: "ubuntu_1804"}
         Clang 8: {CXX: clang++-8, TOOLSET: clang-8, PACKAGES: clang-8, LLVM_VER: 8, LLVM_OS: 'bionic', CONTAINER: "ubuntu_1804"}
         Clang 7: {CXX: clang++-7, TOOLSET: clang-7, PACKAGES: clang-7, LLVM_VER: 7, LLVM_OS: 'bionic', CONTAINER: "ubuntu_1804"}

doc/src/appendix.adoc

@@ -0,0 +1,33 @@
+[[b2.appendix]]
+[appendix]
+= Licenses
+
+In addition to B2 being licensed under the Boost Software License - Version 1.0,
+B2 makes use of additional libraries that are differently licensed as follows.
+
+== MIT License
+
+```
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+```
+
+https://github.com/nlohmann/json[JSON for Modern C++]::
+Copyright (c) 2013-2022 Niels Lohmann

doc/src/reference.adoc

@@ -775,6 +775,7 @@ include::../../src/engine/mod_regex.h[tag=reference]
 include::../../src/engine/mod_set.h[tag=reference]
 include::../../src/engine/mod_string.h[tag=reference]
 include::../../src/engine/mod_version.h[tag=reference]
+include::../../src/engine/mod_db.h[tag=reference]
 
 include::path.adoc[]
 

doc/src/standalone.adoc

@@ -66,4 +66,6 @@ include::code_ref.adoc[]
 
 include::history.adoc[]
 
+include::appendix.adoc[]
+
 :leveloffset: -1

src/engine/bindjam.cpp

@@ -21,6 +21,7 @@ Distributed under the Boost Software License, Version 1.0.
 #include "value.h"
 #include "variable.h"
 
+#include "mod_db.h"
 #include "mod_jam_builtin.h"
 #include "mod_jam_class.h"
 #include "mod_jam_errors.h"
@@ -821,7 +822,8 @@ void bind_jam(FRAME * f)
 		.bind(set_module())
 		.bind(string_module())
 		.bind(sysinfo_module())
-		.bind(version_module());
+		.bind(version_module())
+		.bind(db_module());
 }
 
 }} // namespace b2::jam

src/engine/build.bat

@@ -177,6 +177,7 @@ set B2_SOURCES=%B2_SOURCES% native.cpp option.cpp output.cpp parse.cpp pathnt.cp
 set B2_SOURCES=%B2_SOURCES% pathsys.cpp pathunix.cpp regexp.cpp rules.cpp scan.cpp search.cpp jam_strings.cpp
 set B2_SOURCES=%B2_SOURCES% startup.cpp tasks.cpp
 set B2_SOURCES=%B2_SOURCES% timestamp.cpp value.cpp variable.cpp w32_getreg.cpp
+set B2_SOURCES=%B2_SOURCES% mod_db.cpp
 set B2_SOURCES=%B2_SOURCES% mod_jam_builtin.cpp
 set B2_SOURCES=%B2_SOURCES% mod_jam_class.cpp
 set B2_SOURCES=%B2_SOURCES% mod_jam_errors.cpp

src/engine/build.sh

@@ -487,6 +487,7 @@ timestamp.cpp \
 value.cpp \
 variable.cpp \
 w32_getreg.cpp \
+mod_db.cpp \
 mod_jam_builtin.cpp \
 mod_jam_class.cpp \
 mod_jam_errors.cpp \