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#!/usr/bin/env python3
from evalidate import Expr, ValidationException, CompilationException, ExecutionException
import json
import sys
import argparse
import time
def short_repr(data, limit=100):
try:
text = json.dumps(data, ensure_ascii=False)
except Exception:
text = repr(data)
if len(text) > limit:
text = text[:limit] + "..."
return text
def get_args():
parser = argparse.ArgumentParser('Grep JSON files by python expression')
parser.add_argument('-b', '--benchmark', default=False, action='store_true', help='Do not print, just search and measure search time')
parser.add_argument('-v', '--verbose', default=False, action='store_true', help='Be verbose')
parser.add_argument('-l', '--jsonl', default=False, action='store_true', help='input is JSONL (not JSON list)')
parser.add_argument('-k', '--keypath', type=str, help='key path to list separated by ::, e.g.: -k shop::products::onstock')
parser.add_argument('-f', '--format', type=str, help='format (if not JSON), e.g. -f \'{sku} {price} ({stock}) {title!r}\'')
parser.add_argument('expr', help='Python filter expression')
parser.add_argument('path', default=None, help='Path to JSON list (or stdin)', nargs='?')
return parser.parse_args()
def vprint(s: str):
if args.verbose:
print(s)
def main():
global args
args = get_args()
if args.benchmark:
args.verbose = True
out = list()
vprint(f'# loading data from {args.path or "stdin"}')
if args.path:
f = open(args.path, "r", encoding="utf-8")
else:
f = sys.stdin
with f:
if args.jsonl:
data = [json.loads(line) for line in f if line.strip()]
else:
data = json.load(f)
# follow keypath if needed
try:
if args.keypath:
for k in args.keypath.split('::'):
data = data[k]
except KeyError as e:
print(f"No such key: {e}", file=sys.stderr)
sys.exit(1)
vprint(f'# loaded {len(data)} records from {args.path}')
try:
expr = Expr(args.expr)
except (ValidationException, CompilationException) as e:
print(e)
sys.exit(1)
c=0
start = time.time()
if not isinstance(data, list):
print("data is not a list", file=sys.stderr)
print(short_repr(data))
sys.exit(1)
for p in data:
try:
# we use native eval with validated code to get better speed
r = eval(expr.code, dict(), p)
if r:
out.append(p)
c+=1
except KeyError as e:
pass
# print("Runtime exception:", e)
elapsed = round(time.time() - start, 2)
vprint(f"# {c}/{len(data)} elements found in {elapsed} seconds".format(c))
if not args.benchmark:
if args.format:
for el in out:
print(args.format.format(**el))
else:
print(json.dumps(out, indent=2))
if __name__ == '__main__':
main()
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