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#!/usr/bin/env python3
import os
import sys
import argparse
import hashlib
import re
import yaml
whoami = os.path.basename(sys.argv[0])
BANNER = f'''//
// This file is automatically generated by {whoami}.
// Edits will be automatically overwritten if the build is
// run in maintainer mode.
//'''
def warn(*args, **kwargs):
print(*args, file=sys.stderr, **kwargs)
class Main:
SOURCES = [whoami, 'job.yml']
DESTS = {
'decl': 'libqpdf/qpdf/auto_job_decl.hh',
'init': 'libqpdf/qpdf/auto_job_init.hh',
}
SUMS = 'job.sums'
def main(self, args=sys.argv[1:], prog=whoami):
options = self.parse_args(args, prog)
self.top(options)
def parse_args(self, args, prog):
parser = argparse.ArgumentParser(
prog=prog,
description='Generate files for QPDFJob',
)
mxg = parser.add_mutually_exclusive_group(required=True)
mxg.add_argument('--check',
help='update checksums if files are not up to date',
action='store_true', default=False)
mxg.add_argument('--generate',
help='generate files from sources',
action='store_true', default=False)
return parser.parse_args(args)
def top(self, options):
if options.check:
self.check()
elif options.generate:
self.generate()
else:
exit(f'{whoami} unknown mode')
def get_hashes(self):
hashes = {}
for i in sorted([*self.SOURCES, *self.DESTS.values()]):
m = hashlib.sha256()
try:
with open(i, 'rb') as f:
m.update(f.read())
hashes[i] = m.hexdigest()
except FileNotFoundError:
pass
return hashes
def check(self):
hashes = self.get_hashes()
match = False
try:
old_hashes = {}
with open(self.SUMS, 'r') as f:
for line in f.readlines():
m = re.match(r'^(\S+) (\S+)\s*$', line)
if m:
old_hashes[m.group(1)] = m.group(2)
match = old_hashes == hashes
except Exception:
pass
if not match:
exit(f'{whoami}: auto job inputs have changed')
def update_hashes(self):
hashes = self.get_hashes()
with open(self.SUMS, 'w') as f:
print(f'# Generated by {whoami}', file=f)
for k, v in hashes.items():
print(f'{k} {v}', file=f)
def generate(self):
warn(f'{whoami}: regenerating auto job files')
with open('job.yml', 'r') as f:
data = yaml.safe_load(f.read())
self.validate(data)
with open(self.DESTS['decl'], 'w') as f:
print(BANNER, file=f)
self.generate_decl(data, f)
with open(self.DESTS['init'], 'w') as f:
print(BANNER, file=f)
self.generate_init(data, f)
# Update hashes last to ensure that this will be rerun in the
# event of a failure.
self.update_hashes()
# DON'T ADD CODE TO generate AFTER update_hashes
def check_keys(self, what, d, exp):
if not isinstance(d, dict):
exit(f'{what} is not a dictionary')
actual = set(d.keys())
extra = actual - exp
if extra:
exit(f'{what}: unknown keys = {extra}')
def validate(self, data):
self.check_keys('top', data, set(['choices', 'options']))
for o in data['options']:
self.check_keys('top', o, set(
['table', 'prefix', 'bare', 'positional',
'optional_parameter', 'required_parameter',
'required_choices', 'from_table']))
def to_identifier(self, label, prefix, const):
identifier = re.sub(r'[^a-zA-Z0-9]', '_', label)
if const:
identifier = identifier.upper()
else:
identifier = identifier.lower()
identifier = re.sub(r'(?:^|_)([a-z])',
lambda x: x.group(1).upper(),
identifier).replace('_', '')
return prefix + identifier
def generate_decl(self, data, f):
for o in data['options']:
table = o['table']
if table in ('main', 'help'):
continue
i = self.to_identifier(table, 'O_', True)
print(f'static constexpr char const* {i} = "{table}";', file=f)
print('', file=f)
for o in data['options']:
table = o['table']
prefix = 'arg' + o.get('prefix', '')
if o.get('positional', False):
print(f'void {prefix}Positional(char*);', file=f)
for i in o.get('bare', []):
identifier = self.to_identifier(i, prefix, False)
print(f'void {identifier}();', file=f)
for i in o.get('optional_parameter', []):
identifier = self.to_identifier(i, prefix, False)
print(f'void {identifier}(char *);', file=f)
for i in o.get('required_parameter', {}):
identifier = self.to_identifier(i, prefix, False)
print(f'void {identifier}(char *);', file=f)
for i in o.get('required_choices', {}):
identifier = self.to_identifier(i, prefix, False)
print(f'void {identifier}(char *);', file=f)
if table not in ('main', 'help'):
identifier = self.to_identifier(table, 'argEnd', False)
print(f'void {identifier}();', file=f)
def generate_init(self, data, f):
for k, v in data['choices'].items():
print(f'char const* {k}_choices[] = {{', file=f, end='')
for i in v:
print(f'"{i}", ', file=f, end='')
print('0};', file=f)
if __name__ == '__main__':
try:
os.chdir(os.path.dirname(os.path.realpath(__file__)))
Main().main()
except KeyboardInterrupt:
exit(130)
|
