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#!/usr/bin/env python
#
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
#
#
# transform_sql.py -- create a header file with the appropriate SQL variables
# from an SQL file
#
import os
import re
import sys
DEFINE_END = ' ""\n\n'
def usage_and_exit(msg):
if msg:
sys.stderr.write('%s\n\n' % msg)
sys.stderr.write(
'USAGE: %s SQLITE_FILE [OUTPUT_FILE]\n'
' stdout will be used if OUTPUT_FILE is not provided.\n'
% os.path.basename(sys.argv[0]))
sys.stderr.flush()
sys.exit(1)
class Processor(object):
re_comments = re.compile(r'/\*.*?\*/', re.MULTILINE|re.DOTALL)
# a few SQL comments that act as directives for this transform system
re_format = re.compile('-- *format: *([0-9]+)')
re_statement = re.compile('-- *STMT_([A-Z_0-9]+)')
re_include = re.compile('-- *include: *([-a-z]+)')
re_define = re.compile('-- *define: *([A-Z_0-9]+)')
def _sub_format(self, match):
vsn = match.group(1)
self.close_define()
self.output.write('#define %s_%s \\\n' % (self.var_name, match.group(1)))
self.var_printed = True
def _sub_statement(self, match):
name = match.group(1)
self.close_define()
self.output.write('#define STMT_%s %d\n' % (match.group(1),
self.stmt_count))
self.output.write('#define STMT_%d \\\n' % (self.stmt_count,))
self.var_printed = True
self.stmt_count += 1
def _sub_include(self, match):
filepath = os.path.join(self.dirpath, match.group(1) + '.sql')
self.close_define()
self.process_file(open(filepath).read())
def _sub_define(self, match):
define = match.group(1)
self.output.write(' APR_STRINGIFY(%s) \\\n' % define)
def __init__(self, dirpath, output, var_name):
self.dirpath = dirpath
self.output = output
self.var_name = var_name
self.stmt_count = 0
self.var_printed = False
self._directives = {
self.re_format : self._sub_format,
self.re_statement : self._sub_statement,
self.re_include : self._sub_include,
self.re_define : self._sub_define,
}
def process_file(self, input):
input = self.re_comments.sub('', input)
for line in input.split('\n'):
line = line.replace('"', '\\"')
line = re.sub(r'IS_STRICT_DESCENDANT_OF[(]([A-Za-z_.]+), ([?][0-9]+)[)]',
r"((\1) > (\2) || '/' AND (\1) < (\2) || '0') ",
line)
if line.strip():
handled = False
for regex, handler in self._directives.iteritems():
match = regex.match(line)
if match:
handler(match)
handled = True
break
# we've handed the line, so skip it
if handled:
continue
if not self.var_printed:
self.output.write('#define %s \\\n' % self.var_name)
self.var_printed = True
# got something besides whitespace. write it out. include some whitespace
# to separate the SQL commands. and a backslash to continue the string
# onto the next line.
self.output.write(' "%s " \\\n' % line.rstrip())
# previous line had a continuation. end the madness.
self.close_define()
def close_define(self):
if self.var_printed:
self.output.write(DEFINE_END)
self.var_printed = False
def main(input_filepath, output):
filename = os.path.basename(input_filepath)
input = open(input_filepath, 'r').read()
var_name = re.sub('[-.]', '_', filename).upper()
output.write(
'/* This file is automatically generated from %s.\n'
' * Do not edit this file -- edit the source and rerun gen-make.py */\n'
'\n'
% (filename,))
proc = Processor(os.path.dirname(input_filepath), output, var_name)
proc.process_file(input)
### the STMT_%d naming precludes *multiple* transform_sql headers from
### being used within the same .c file. for now, that's more than fine.
### in the future, we can always add a var_name discriminator or use
### the statement name itself (which should hopefully be unique across
### all names in use; or can easily be made so)
if proc.stmt_count > 0:
output.write(
'#define %s_DECLARE_STATEMENTS(varname) \\\n' % (var_name,)
+ ' static const char * const varname[] = { \\\n'
+ ', \\\n'.join(' STMT_%d' % (i,) for i in range(proc.stmt_count))
+ ', \\\n NULL \\\n }\n')
if __name__ == '__main__':
if len(sys.argv) < 2 or len(sys.argv) > 3:
usage_and_exit('Incorrect number of arguments')
# Note: we could use stdin, but then we'd have no var_name
input_filepath = sys.argv[1]
if len(sys.argv) > 2:
output_file = open(sys.argv[2], 'w')
else:
output_file = sys.stdout
main(input_filepath, output_file)
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