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mdict_query.py
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mdict_query.py
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# -*- coding: utf-8 -*-
# version: python 3.5
from readmdict import MDX, MDD
from struct import pack, unpack
from io import BytesIO
import re
import sys
import os
import sqlite3
import json
# zlib compression is used for engine version >=2.0
import zlib
# LZO compression is used for engine version < 2.0
try:
import lzo
except ImportError:
lzo = None
#print("LZO compression support is not available")
# 2x3 compatible
if sys.hexversion >= 0x03000000:
unicode = str
version = '1.1'
class IndexBuilder(object):
#todo: enable history
def __init__(self, fname, encoding = "", passcode = None, force_rebuild = False, enable_history = False, sql_index = True, check = False):
self._mdx_file = fname
self._mdd_file = ""
self._encoding = ''
self._stylesheet = {}
self._title = ''
self._version = ''
self._description = ''
self._sql_index = sql_index
self._check = check
_filename, _file_extension = os.path.splitext(fname)
assert(_file_extension == '.mdx')
assert(os.path.isfile(fname))
self._mdx_db = _filename + ".mdx.db"
# make index anyway
if force_rebuild:
self._make_mdx_index(self._mdx_db)
if os.path.isfile(_filename + '.mdd'):
self._mdd_file = _filename + ".mdd"
self._mdd_db = _filename + ".mdd.db"
self._make_mdd_index(self._mdd_db)
if os.path.isfile(self._mdx_db):
#read from META table
conn = sqlite3.connect(self._mdx_db)
#cursor = conn.execute("SELECT * FROM META")
cursor = conn.execute("SELECT * FROM META WHERE key = \"version\"")
#判断有无版本号
for cc in cursor:
self._version = cc[1]
################# if not version in fo #############
if not self._version:
print("version info not found")
conn.close()
self._make_mdx_index(self._mdx_db)
print("mdx.db rebuilt!")
if os.path.isfile(_filename + '.mdd'):
self._mdd_file = _filename + ".mdd"
self._mdd_db = _filename + ".mdd.db"
self._make_mdd_index(self._mdd_db)
print("mdd.db rebuilt!")
return None
cursor = conn.execute("SELECT * FROM META WHERE key = \"encoding\"")
for cc in cursor:
self._encoding = cc[1]
cursor = conn.execute("SELECT * FROM META WHERE key = \"stylesheet\"")
for cc in cursor:
self._stylesheet = json.loads(cc[1])
cursor = conn.execute("SELECT * FROM META WHERE key = \"title\"")
for cc in cursor:
self._title = cc[1]
cursor = conn.execute("SELECT * FROM META WHERE key = \"description\"")
for cc in cursor:
self._description = cc[1]
#for cc in cursor:
# if cc[0] == 'encoding':
# self._encoding = cc[1]
# continue
# if cc[0] == 'stylesheet':
# self._stylesheet = json.loads(cc[1])
# continue
# if cc[0] == 'title':
# self._title = cc[1]
# continue
# if cc[0] == 'title':
# self._description = cc[1]
else:
self._make_mdx_index(self._mdx_db)
if os.path.isfile(_filename + ".mdd"):
self._mdd_file = _filename + ".mdd"
self._mdd_db = _filename + ".mdd.db"
if not os.path.isfile(self._mdd_db):
self._make_mdd_index(self._mdd_db)
pass
def _replace_stylesheet(self, txt):
# substitute stylesheet definition
txt_list = re.split('`\d+`', txt)
txt_tag = re.findall('`\d+`', txt)
txt_styled = txt_list[0]
for j, p in enumerate(txt_list[1:]):
style = self._stylesheet[txt_tag[j][1:-1]]
if p and p[-1] == '\n':
txt_styled = txt_styled + style[0] + p.rstrip() + style[1] + '\r\n'
else:
txt_styled = txt_styled + style[0] + p + style[1]
return txt_styled
def _make_mdx_index(self, db_name):
if os.path.exists(db_name):
os.remove(db_name)
mdx = MDX(self._mdx_file)
self._mdx_db = db_name
returned_index = mdx.get_index(check_block = self._check)
index_list = returned_index['index_dict_list']
conn = sqlite3.connect(db_name)
c = conn.cursor()
c.execute(
''' CREATE TABLE MDX_INDEX
(key_text text not null,
file_pos integer,
compressed_size integer,
decompressed_size integer,
record_block_type integer,
record_start integer,
record_end integer,
offset integer
)'''
)
tuple_list = [
(item['key_text'],
item['file_pos'],
item['compressed_size'],
item['decompressed_size'],
item['record_block_type'],
item['record_start'],
item['record_end'],
item['offset']
)
for item in index_list
]
c.executemany('INSERT INTO MDX_INDEX VALUES (?,?,?,?,?,?,?,?)',
tuple_list)
# build the metadata table
meta = returned_index['meta']
c.execute(
'''CREATE TABLE META
(key text,
value text
)''')
#for k,v in meta:
# c.execute(
# 'INSERT INTO META VALUES (?,?)',
# (k, v)
# )
c.executemany(
'INSERT INTO META VALUES (?,?)',
[('encoding', meta['encoding']),
('stylesheet', meta['stylesheet']),
('title', meta['title']),
('description', meta['description']),
('version', version)
]
)
if self._sql_index:
c.execute(
'''
CREATE INDEX key_index ON MDX_INDEX (key_text)
'''
)
conn.commit()
conn.close()
#set class member
self._encoding = meta['encoding']
self._stylesheet = json.loads(meta['stylesheet'])
self._title = meta['title']
self._description = meta['description']
def _make_mdd_index(self, db_name):
if os.path.exists(db_name):
os.remove(db_name)
mdd = MDD(self._mdd_file)
self._mdd_db = db_name
index_list = mdd.get_index(check_block = self._check)
conn = sqlite3.connect(db_name)
c = conn.cursor()
c.execute(
''' CREATE TABLE MDX_INDEX
(key_text text not null unique,
file_pos integer,
compressed_size integer,
decompressed_size integer,
record_block_type integer,
record_start integer,
record_end integer,
offset integer
)'''
)
tuple_list = [
(item['key_text'],
item['file_pos'],
item['compressed_size'],
item['decompressed_size'],
item['record_block_type'],
item['record_start'],
item['record_end'],
item['offset']
)
for item in index_list
]
c.executemany('INSERT INTO MDX_INDEX VALUES (?,?,?,?,?,?,?,?)',
tuple_list)
if self._sql_index:
c.execute(
'''
CREATE UNIQUE INDEX key_index ON MDX_INDEX (key_text)
'''
)
conn.commit()
conn.close()
def get_mdx_by_index(self, fmdx, index):
fmdx.seek(index['file_pos'])
record_block_compressed = fmdx.read(index['compressed_size'])
record_block_type = record_block_compressed[:4]
record_block_type = index['record_block_type']
decompressed_size = index['decompressed_size']
#adler32 = unpack('>I', record_block_compressed[4:8])[0]
if record_block_type == 0:
_record_block = record_block_compressed[8:]
# lzo compression
elif record_block_type == 1:
if lzo is None:
print("LZO compression is not supported")
# decompress
header = b'\xf0' + pack('>I', index['decompressed_size'])
_record_block = lzo.decompress(record_block_compressed[8:], initSize = decompressed_size, blockSize=1308672)
# zlib compression
elif record_block_type == 2:
# decompress
_record_block = zlib.decompress(record_block_compressed[8:])
record = _record_block[index['record_start'] - index['offset']:index['record_end'] - index['offset']]
record = record = record.decode(self._encoding, errors='ignore').strip(u'\x00').encode('utf-8')
if self._stylesheet:
record = self._replace_stylesheet(record)
record = record.decode('utf-8')
return record
def get_mdd_by_index(self, fmdx, index):
fmdx.seek(index['file_pos'])
record_block_compressed = fmdx.read(index['compressed_size'])
record_block_type = record_block_compressed[:4]
record_block_type = index['record_block_type']
decompressed_size = index['decompressed_size']
#adler32 = unpack('>I', record_block_compressed[4:8])[0]
if record_block_type == 0:
_record_block = record_block_compressed[8:]
# lzo compression
elif record_block_type == 1:
if lzo is None:
print("LZO compression is not supported")
# decompress
header = b'\xf0' + pack('>I', index['decompressed_size'])
_record_block = lzo.decompress(record_block_compressed[8:], initSize = decompressed_size, blockSize=1308672)
# zlib compression
elif record_block_type == 2:
# decompress
_record_block = zlib.decompress(record_block_compressed[8:])
data = _record_block[index['record_start'] - index['offset']:index['record_end'] - index['offset']]
return data
def mdx_lookup(self, keyword):
conn = sqlite3.connect(self._mdx_db)
cursor = conn.execute("SELECT * FROM MDX_INDEX WHERE key_text = " + "\"" + keyword + "\"")
lookup_result_list = []
mdx_file = open(self._mdx_file,'rb')
for result in cursor:
index = {}
index['file_pos'] = result[1]
index['compressed_size'] = result[2]
index['decompressed_size'] = result[3]
index['record_block_type'] = result[4]
index['record_start'] = result[5]
index['record_end'] = result[6]
index['offset'] = result[7]
lookup_result_list.append(self.get_mdx_by_index(mdx_file, index))
conn.close()
mdx_file.close()
return lookup_result_list
def mdd_lookup(self, keyword):
conn = sqlite3.connect(self._mdd_db)
cursor = conn.execute("SELECT * FROM MDX_INDEX WHERE key_text = " + "\"" + keyword + "\"")
lookup_result_list = []
mdd_file = open(self._mdd_file,'rb')
for result in cursor:
index = {}
index['file_pos'] = result[1]
index['compressed_size'] = result[2]
index['decompressed_size'] = result[3]
index['record_block_type'] = result[4]
index['record_start'] = result[5]
index['record_end'] = result[6]
index['offset'] = result[7]
lookup_result_list.append(self.get_mdd_by_index(mdd_file, index))
mdd_file.close()
conn.close()
return lookup_result_list
def get_mdd_keys(self, query = ''):
if not self._mdd_db:
return []
conn = sqlite3.connect(self._mdd_db)
if query:
if '*' in query:
query = query.replace('*','%')
else:
query = query + '%'
cursor = conn.execute('SELECT key_text FROM MDX_INDEX WHERE key_text LIKE \"' + query + '\"')
keys = [item[0] for item in cursor]
else:
cursor = conn.execute('SELECT key_text FROM MDX_INDEX')
keys = [item[0] for item in cursor]
conn.close()
return keys
def get_mdx_keys(self, query = ''):
conn = sqlite3.connect(self._mdx_db)
if query:
if '*' in query:
query = query.replace('*','%')
else:
query = query + '%'
cursor = conn.execute('SELECT key_text FROM MDX_INDEX WHERE key_text LIKE \"' + query + '\"')
keys = [item[0] for item in cursor]
else:
cursor = conn.execute('SELECT key_text FROM MDX_INDEX')
keys = [item[0] for item in cursor]
conn.close()
return keys
# mdx_builder = IndexBuilder("oald.mdx")
# text = mdx_builder.mdx_lookup('dedication')
# keys = mdx_builder.get_mdx_keys()
# keys1 = mdx_builder.get_mdx_keys('abstrac')
# keys2 = mdx_builder.get_mdx_keys('*tion')
# for key in keys2:
# text = mdx_builder.mdx_lookup(key)[0]
# pass