itchyny
df24981307
`reduce f as $x (init; update)` evaluated `f` against a stack slot
that forkpoints created while evaluating `init` restore. Both the
`DUPN` opening the reduction loop and the `LOADVN` retrieving the
result pop that slot destructively, nulling it out, so an `init`
that backtracks (e.g. `0, 0`) made `f` see `null` and fail with
"Cannot iterate over null".
Duplicate the input before the `FORK` instead of inside the loop,
and drop the leftover copy with `POP` once the loop is exhausted.
The slot left live at the `FORK` is then a block pushed after
`init` completed, which no earlier forkpoint can reach, so nulling
it is harmless. This is the same approach `gen_foreach` has used
since c70ae1a.
`DUPN` had no other user, so remove the opcode.
jq
jq is a lightweight and flexible command-line JSON processor akin to sed,awk,grep, and friends for JSON data. It's written in portable C and has zero runtime dependencies, allowing you to easily slice, filter, map, and transform structured data.
Documentation
- Official Documentation: jqlang.org
- Try jq Online: play.jqlang.org
Installation
Prebuilt Binaries
Download the latest releases from the GitHub release page.
The platform-specific assets are standalone executables, not archives. On macOS and Linux,
rename the downloaded file to jq and make it executable with chmod +x jq.
Docker Image
Pull the jq image to start quickly with Docker.
Run with Docker
Example: Extracting the version from a package.json file
docker run --rm -i ghcr.io/jqlang/jq:latest < package.json '.version'
Example: Extracting the version from a package.json file with a mounted volume
docker run --rm -i -v "$PWD:$PWD" -w "$PWD" ghcr.io/jqlang/jq:latest '.version' package.json
Building from source
Dependencies
- libtool
- make
- automake
- autoconf
Instructions
git submodule update --init # if building from git to get oniguruma
autoreconf -i # if building from git
./configure --with-oniguruma=builtin
make clean # if upgrading from a version previously built from source
make -j8
make check
sudo make install
Build a statically linked version:
make LDFLAGS=-all-static
If you're not using the latest git version but instead building a released tarball (available on the release page), skip the autoreconf step, and flex or bison won't be needed.
Cross-Compilation
For details on cross-compilation, check out the GitHub Actions file and the cross-compilation wiki page.
Community & Support
- Questions & Help: Stack Overflow (jq tag)
- Chat & Community: Join us on Discord
- Wiki & Advanced Topics: Explore the Wiki
License
jq is released under the MIT License. jq's documentation is
licensed under the Creative Commons CC BY 3.0.
jq uses parts of the open source C library "decNumber", which is distributed
under ICU License