sqlpp11/scripts/sqlite2cpp.py at optional-no-dynamic · rbock/sqlpp11 · GitHub

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#!/usr/bin/env python3

# Redistribution and use in source and binary forms, with or without modification,

# are permitted provided that the following conditions are met:

# * Redistributions of source code must retain the above copyright notice,

# this list of conditions and the following disclaimer.

# * Redistributions in binary form must reproduce the above copyright notice,

# this list of conditions and the following disclaimer in the documentation

# and/or other materials provided with the distribution.

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND

# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

# IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,

# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE

# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

# OF THE POSSIBILITY OF SUCH DAMAGE.

import argparse

import os

import re

import sqlite3

import sys

INCLUDE = 'sqlpp11'

NAMESPACE = 'sqlpp'

# map sqlite3 types

types = {

'integer': 'integer',

'text': 'text',

'blob': 'blob',

'real': 'floating_point',

}

def main():

parser = argparse.ArgumentParser(description='sqlpp11 cpp schema generator')

parser.add_argument('ddl', help='path to ddl')

parser.add_argument('target', help='path to target')

parser.add_argument('namespace', help='namespace')

parser.add_argument('-identity-naming',

help='Use table and column names from the ddl '

'(defaults to UpperCamelCase for tables and '

'lowerCamelCase for columns)',

action='store_true')

args = parser.parse_args()

pathToHeader = args.target + '.h'

# execute schema scripts

conn = sqlite3.connect(':memory:')

conn.executescript(open(args.ddl).read())

# set vars

toClassName = identity_naming_func if args.identity_naming else class_name_naming_func

toMemberName = identity_naming_func if args.identity_naming else member_name_naming_func

DataTypeError = False

header = open(pathToHeader, 'w')

namespace = args.namespace

nsList = namespace.split('::')

# start printing

print('#pragma once', file=header)

print('', file=header)

print('// generated by ' + ' '.join(sys.argv), file=header)

print('', file=header)

print('#include <' + INCLUDE + '/table.h>', file=header)

print('#include <' + INCLUDE + '/data_types.h>', file=header)

print('#include <' + INCLUDE + '/char_sequence.h>', file=header)

print('', file=header)

for ns in nsList:

print('namespace ' + ns, file=header)

print('{', file=header)

cursor = conn.cursor()

cursor.execute("SELECT name FROM sqlite_master WHERE type='table';")

tables = cursor.fetchall()

for table_name in tables:

table_name = table_name[0]

if table_name.startswith('sqlite_'):

continue

sqlTableName = table_name

tableClass = toClassName(sqlTableName)

tableMember = toMemberName(sqlTableName)

tableNamespace = tableClass + '_'

tableTemplateParameters = tableClass

print(' namespace ' + tableNamespace, file=header)

print(' {', file=header)

columns = cursor.execute("PRAGMA table_info('%s')" % table_name).fetchall()

for column in columns:

sqlColumnName = column[1]

columnClass = toClassName(sqlColumnName)

tableTemplateParameters += ',\n ' + tableNamespace + '::' + columnClass

columnMember = toMemberName(sqlColumnName)

sqlColumnType = column[2].lower()

sqlCanBeNull = column[3] == 0 or column[3] == '0'

print(' struct ' + columnClass, file=header)

print(' {', file=header)

print(' struct _alias_t', file=header)

print(' {', file=header)

print(' static constexpr const char _literal[] = "' + escape_if_reserved(sqlColumnName) + '";', file=header)

print(' using _name_t = sqlpp::make_char_sequence<sizeof(_literal), _literal>;', file=header)

print(' template<typename T>', file=header)

print(' struct _member_t', file=header)

print(' {', file=header)

print(' T ' + columnMember + ';', file=header)

print(' T& operator()() { return ' + columnMember + '; }', file=header)

print(' const T& operator()() const { return ' + columnMember + '; }', file=header)

print(' };', file=header)

try:

traitslist = [NAMESPACE + '::' + types[sqlColumnType]]

except KeyError as e:

print ('Error: datatype "' + sqlColumnType + '"" is not supported.')

DataTypeError = True

requireInsert = True

hasAutoValue = sqlColumnName == 'id'

if hasAutoValue:

traitslist.append(NAMESPACE + '::tag::must_not_insert')

traitslist.append(NAMESPACE + '::tag::must_not_update')

requireInsert = False

if sqlCanBeNull:

traitslist.append(NAMESPACE + '::tag::can_be_null')

requireInsert = False

if column[4]:

requireInsert = False

if requireInsert:

traitslist.append(NAMESPACE + '::tag::require_insert')

print(' using _traits = ' + NAMESPACE + '::make_traits<' + ', '.join(traitslist) + '>;', file=header)

print(' };', file=header)

print(' } // namespace ' + tableNamespace, file=header)

print('', file=header)

print(' struct ' + tableClass + ': ' + NAMESPACE + '::table_t<' + tableTemplateParameters + '>', file=header)

print(' {', file=header)

print(' struct _alias_t', file=header)

print(' {', file=header)

print(' static constexpr const char _literal[] = "' + sqlTableName + '";', file=header)

print(' using _name_t = sqlpp::make_char_sequence<sizeof(_literal), _literal>;', file=header)

print(' template<typename T>', file=header)

print(' struct _member_t', file=header)

print(' {', file=header)

print(' T ' + tableMember + ';', file=header)

print(' T& operator()() { return ' + tableMember + '; }', file=header)

print(' const T& operator()() const { return ' + tableMember + '; }', file=header)

print(' };', file=header)

for ns in reversed(nsList):

print('} // namespace ' + ns, file=header)

if (DataTypeError):

print("Error: unsupported datatypes." )

print("Possible solutions:")

print("A) Implement this datatype (examples: sqlpp11/data_types)" )

print("B) Extend/upgrade ddl2cpp (edit types map)" )

print("C) Raise an issue on github" )

sys.exit(10) #return non-zero error code, we might need it for automation

def get_include_guard_name(namespace, inputfile):

val = re.sub("[^A-Za-z0-9]+", "_", namespace + '_' + os.path.basename(inputfile))

return val.upper()

def identity_naming_func(s):

return s

def repl_camel_case_func(m):

if m.group(1) == '_':

return m.group(2).upper()

else:

return m.group(1) + m.group(2).upper()

def class_name_naming_func(s):

return re.sub("(^|\s|[_0-9])(\S)", repl_camel_case_func, s)

def member_name_naming_func(s):

return re.sub("(\s|_|[0-9])(\S)", repl_camel_case_func, s)

def escape_if_reserved(name):

reserved_names = [

'GROUP',

'ORDER',

]

if name.upper() in reserved_names:

return '!{}'.format(name)

return name

if __name__ == '__main__':

main()

sys.exit(0)

sqlpp11/scripts/sqlite2cpp.py at optional-no-dynamic · rbock/sqlpp11 · GitHub

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