commit | 6716e23ae6d534db0d3f2af2d1610f17444fb5a9 | [log] [tgz] |
---|---|---|
author | Emanuele Torre <torreemanuele6@gmail.com> | Mon Jul 31 21:56:15 2023 +0200 |
committer | Nico Williams <nico@cryptonector.com> | Mon Jul 31 15:28:01 2023 -0500 |
tree | b2afefc6b28ed9831c0473861c49ab1f3c023b41 | |
parent | f61f842ad0b4585cc493868e83f17a91c9f1a53e [diff] |
Declare cfunction.fptr as jv (*)() to avoid having to cast everywhere You only need to specify the return type in a function pointer declaration in C. If you use () in the declaration, the function pointer can be called with any arguments, and the type of the arguments is decided for each function call based on the types of the arguments used for the call. (To declare a function pointer for a function with no arguments, you use `(void)'.) Since all the cfunction structs have a fptr that points to a functions that return jv, not void, we can we can just declare cfunction.fptr as jv (*)() and avoid having those annoying and technically not C-standard compliant casts everywhere.
jq is a lightweight and flexible command-line JSON processor.
If you want to learn to use jq, read the documentation at https://jqlang.github.io/jq. This documentation is generated from the docs/ folder of this repository. You can also try it online at jqplay.org.
If you want to hack on jq, feel free, but be warned that its internals are not well-documented at the moment. Bring a hard hat and a shovel. Also, read the wiki: https://github.com/jqlang/jq/wiki, where you will find cookbooks, discussion of advanced topics, internals, release engineering, and more.
Source tarball and built executable releases can be found on the homepage and on the github release page, https://github.com/jqlang/jq/releases. Docker image is available at https://github.com/jqlang/jq/pkgs/container/jq.
If you‘re building directly from the latest git, you’ll need libtool, make, automake, and autoconf installed. To get regexp support you'll also need to install Oniguruma or clone it as a git submodule as per the instructions below. To build, run:
git submodule update --init # if building from git to get oniguruma autoreconf -i # if building from git ./configure --with-oniguruma=builtin make -j8 make check
Developers must --enable-maintainer-mode
when making changes to the jq parser and lexer which also requires bison and flex to be installed.
To build a statically linked version of jq, run:
make LDFLAGS=-all-static
After make finishes, you'll be able to use ./jq
. You can also install it using:
sudo make install
If you‘re not using the latest git version but instead building a released tarball (available on the website), then you won’t need to run autoreconf
(and shouldn‘t), and you won’t need flex or bison.
To cross-compile for OS X and Windows, see docs/Rakefile‘s build task and scripts/crosscompile. You’ll need a cross-compilation environment, such as Mingw for cross-compiling for Windows.
Cross-compilation requires a clean workspace, then:
# git clean ... autoreconf -i ./configure make distclean scripts/crosscompile <name-of-build> <configure-options>
Use the --host=
and --target=
./configure options to select a cross-compilation environment. See also “Cross compilation” on the wiki.
To compile jq to WebAssembly, install the Emscripten SDK, then:
git submodule update --init # if building from git to get oniguruma autoreconf -i # if building from git emconfigure ./configure --with-oniguruma=builtin emmake make EXEEXT=.js CFLAGS="-O2" LDFLAGS="-s EXPORTED_RUNTIME_METHODS=['callMain']"