You can build and run pqlparse using either stack or cabal
(see below). In general pqlparse reads PQL-like input from stdin.
You can parse PQL input like:
$ echo "foo is 'foo' and bar gt 42" | stack run
bar gt 9.0 and foo is 'foo'You can also simplify PQL expressions like:
$ stack run -- -r <<EOF
/foo,category is 'foo' or path is '/bar'
/bar,category is 'bar' and price gt 34
EOF
/bar,category is 'bar' and price gt 34.0
/foo,(category is 'bar' or category is 'foo') and (price gt 34.0 or category is 'foo')Output can be either in CSV (default) or JSON:
$ echo "category is 'ham & eggs'" | stack run -- -o json | jq .
[
{
"attr": "category",
"value": "ham & eggs",
"compare": "=",
"type": "string",
"children": []
}
]$ stack build
$ cabal build
$ stack test
$ cabal test