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<article id="content"> |
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<header> |
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<h1 class="title">Module <code>TermTk.TTkCore.filebuffer</code></h1> |
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</header> |
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<section id="section-intro"> |
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<details class="source"> |
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<summary> |
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<span>Expand source code</span> |
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</summary> |
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<pre><code class="python">#!/usr/bin/env python3 |
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|
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# MIT License |
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# |
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# Copyright (c) 2021 Eugenio Parodi <ceccopierangiolieugenio AT googlemail DOT com> |
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# |
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# Permission is hereby granted, free of charge, to any person obtaining a copy |
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# of this software and associated documentation files (the "Software"), to deal |
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# in the Software without restriction, including without limitation the rights |
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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# copies of the Software, and to permit persons to whom the Software is |
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# furnished to do so, subject to the following conditions: |
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# |
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# The above copyright notice and this permission notice shall be included in all |
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# copies or substantial portions of the Software. |
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# |
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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# SOFTWARE. |
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|
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import os |
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import re |
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import threading |
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from TermTk.TTkCore.log import TTkLog |
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from TermTk.TTkCore.signal import pyTTkSignal, pyTTkSlot |
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|
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''' |
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w1 w3 w2 w5 |
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Buffer |----|----|----|----| cache buffer |
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| \ / \ |
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| x \ |
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| / \ \ |
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Pages | 0 | 2 | 1 |None| 3 |None| index to buffer |
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File |----|----|----|----|----|----| view as list of windows |
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w1 w2 w3 w4 w5 w6 |
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''' |
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class TTkFileBuffer(): |
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class _Page: |
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__slots__ = ('_page', '_size', '_buffer') |
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def __init__(self, page, size): |
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self._page = page |
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self._size = size |
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self._buffer = [""]*self._size |
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#TTkLog.debug(f"{self._buffer}") |
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@property |
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def buffer(self): |
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return self._buffer |
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@property |
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def page(self): |
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return self._page |
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|
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__slots__ = ( |
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'_indexes', '_indexesMutex', |
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'_filename', '_fd', |
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'_pages', '_buffer', |
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'_window', '_numW', |
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'_width', |
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#Signals |
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'indexUpdated', 'indexed') |
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def __init__(self, filename, window, numWindows): |
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# Signals |
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self.indexUpdated = pyTTkSignal(float) |
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self.indexed = pyTTkSignal() |
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|
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self._window = window |
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self._numW = numWindows |
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self._filename = filename |
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self._indexes = [0] |
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self._indexesMutex = threading.Lock() |
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self._width=0 |
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self._buffer = [None]*self._numW |
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self._pages = [None] |
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self._fd = open(self._filename,'r') |
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threading.Thread(target=self.createIndex).start() |
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|
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def __del__(self): |
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self._fd.close() |
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|
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def getLen(self): |
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return len(self._indexes) |
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|
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def getWidth(self, indexes=None): |
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return self._width |
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|
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def getLineDirect(self, line): |
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if line >= self.getLen(): |
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return "" |
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self._indexesMutex.acquire() |
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self._fd.seek(self._indexes[line]) |
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self._indexesMutex.release() |
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return self._fd.readline() |
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|
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def getLine(self, line): |
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if line >= self.getLen(): |
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return "" |
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page = line//self._window |
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offset = line%self._window |
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if self._pages[page] == None: |
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# Dispose of the pages to the bottom |
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dispose = self._buffer.pop(0) |
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if dispose is not None: |
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self._pages[dispose.page] = None |
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self._pages[page] = self._Page(page, self._window) |
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self._buffer.append(self._pages[page]) |
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self._indexesMutex.acquire() |
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self._fd.seek(self._indexes[line-offset]) |
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self._indexesMutex.release() |
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buffer = self._pages[page].buffer |
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for i in range(self._window): |
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buffer[i] = self._fd.readline() |
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#self._width = max(self._width,len(buffer[i])) |
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else: |
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# Push the page to the top of the buffer |
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i = self._buffer.index(self._pages[page]) |
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p = self._buffer.pop(i) |
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self._buffer.append(p) |
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return self._pages[page].buffer[offset] |
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|
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def getSlice(self, line, length): |
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ret = [] |
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for i in range(line, line+length): |
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ret.append(self.getLine(i)) |
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return ret |
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|
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def createIndex(self): |
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# TTkLog.debug(f"Start Indexing {self._filename}") |
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indexes = [] |
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lines = 0 |
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offset = 0 |
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width = 0 |
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fileSize = os.stat(self._filename).st_size |
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chunkSize = 0x1000000 # ~16M |
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with open(self._filename,'r') as infile: |
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while (chunk:=infile.read(chunkSize)): |
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start = 0 |
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while (index:=chunk.find('\n',start))!=-1: |
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indexes.append(index+offset+1) |
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start = index+1 |
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self._indexesMutex.acquire() |
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self._indexes += indexes |
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self._pages += [None]*(1+(self.getLen()//self._window)-(len(self._pages))) |
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self._indexesMutex.release() |
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indexes = [] |
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offset+=len(chunk) |
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self.indexUpdated.emit(offset/fileSize) |
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# TTkLog.debug(f"{self._filename} {offset/fileSize} ...") |
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self._width = max([ (self._indexes[i+1]-self._indexes[i]) for i in range(len(self._indexes)-1) ]) |
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self.indexUpdated.emit(1.0) |
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self.indexed.emit() |
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# TTkLog.debug(f"{self._filename} {offset/fileSize} END") |
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|
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def searchRe(self, regex): |
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indexes = [] |
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id = 0 |
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rr = re.compile(regex) |
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with open(self._filename,'r') as infile: |
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for line in infile: |
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ma = rr.match(line) |
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if ma: |
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indexes.append(id) |
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id += 1 |
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return indexes |
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|
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def search(self, txt): |
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indexes = [] |
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id = 0 |
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with open(self._filename,'r') as infile: |
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for line in infile: |
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if txt in line: |
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indexes.append(id) |
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id += 1 |
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return indexes</code></pre> |
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</details> |
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</section> |
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<section> |
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</section> |
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<section> |
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</section> |
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<section> |
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</section> |
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<section> |
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<h2 class="section-title" id="header-classes">Classes</h2> |
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<dl> |
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<dt id="TermTk.TTkCore.filebuffer.TTkFileBuffer"><code class="flex name class"> |
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<span>class <span class="ident">TTkFileBuffer</span></span> |
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<span>(</span><span>filename, window, numWindows)</span> |
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</code></dt> |
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<dd> |
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<div class="desc"></div> |
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<details class="source"> |
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<summary> |
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<span>Expand source code</span> |
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</summary> |
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<pre><code class="python">class TTkFileBuffer(): |
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class _Page: |
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__slots__ = ('_page', '_size', '_buffer') |
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def __init__(self, page, size): |
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self._page = page |
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self._size = size |
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self._buffer = [""]*self._size |
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#TTkLog.debug(f"{self._buffer}") |
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@property |
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def buffer(self): |
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return self._buffer |
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@property |
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def page(self): |
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return self._page |
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|
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__slots__ = ( |
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'_indexes', '_indexesMutex', |
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'_filename', '_fd', |
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'_pages', '_buffer', |
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'_window', '_numW', |
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'_width', |
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#Signals |
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'indexUpdated', 'indexed') |
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def __init__(self, filename, window, numWindows): |
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# Signals |
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self.indexUpdated = pyTTkSignal(float) |
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self.indexed = pyTTkSignal() |
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|
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self._window = window |
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self._numW = numWindows |
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self._filename = filename |
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self._indexes = [0] |
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self._indexesMutex = threading.Lock() |
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self._width=0 |
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self._buffer = [None]*self._numW |
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self._pages = [None] |
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self._fd = open(self._filename,'r') |
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threading.Thread(target=self.createIndex).start() |
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|
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def __del__(self): |
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self._fd.close() |
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|
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def getLen(self): |
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return len(self._indexes) |
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|
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def getWidth(self, indexes=None): |
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return self._width |
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|
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def getLineDirect(self, line): |
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if line >= self.getLen(): |
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return "" |
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self._indexesMutex.acquire() |
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self._fd.seek(self._indexes[line]) |
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self._indexesMutex.release() |
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return self._fd.readline() |
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|
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def getLine(self, line): |
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if line >= self.getLen(): |
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return "" |
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page = line//self._window |
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offset = line%self._window |
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if self._pages[page] == None: |
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# Dispose of the pages to the bottom |
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dispose = self._buffer.pop(0) |
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if dispose is not None: |
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self._pages[dispose.page] = None |
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self._pages[page] = self._Page(page, self._window) |
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self._buffer.append(self._pages[page]) |
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self._indexesMutex.acquire() |
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self._fd.seek(self._indexes[line-offset]) |
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self._indexesMutex.release() |
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buffer = self._pages[page].buffer |
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for i in range(self._window): |
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buffer[i] = self._fd.readline() |
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#self._width = max(self._width,len(buffer[i])) |
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else: |
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# Push the page to the top of the buffer |
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i = self._buffer.index(self._pages[page]) |
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p = self._buffer.pop(i) |
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self._buffer.append(p) |
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return self._pages[page].buffer[offset] |
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|
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def getSlice(self, line, length): |
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ret = [] |
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for i in range(line, line+length): |
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ret.append(self.getLine(i)) |
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return ret |
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|
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def createIndex(self): |
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# TTkLog.debug(f"Start Indexing {self._filename}") |
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indexes = [] |
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lines = 0 |
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offset = 0 |
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width = 0 |
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fileSize = os.stat(self._filename).st_size |
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chunkSize = 0x1000000 # ~16M |
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with open(self._filename,'r') as infile: |
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while (chunk:=infile.read(chunkSize)): |
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start = 0 |
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while (index:=chunk.find('\n',start))!=-1: |
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indexes.append(index+offset+1) |
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start = index+1 |
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self._indexesMutex.acquire() |
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self._indexes += indexes |
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self._pages += [None]*(1+(self.getLen()//self._window)-(len(self._pages))) |
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self._indexesMutex.release() |
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indexes = [] |
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offset+=len(chunk) |
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self.indexUpdated.emit(offset/fileSize) |
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# TTkLog.debug(f"{self._filename} {offset/fileSize} ...") |
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self._width = max([ (self._indexes[i+1]-self._indexes[i]) for i in range(len(self._indexes)-1) ]) |
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self.indexUpdated.emit(1.0) |
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self.indexed.emit() |
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# TTkLog.debug(f"{self._filename} {offset/fileSize} END") |
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|
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def searchRe(self, regex): |
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indexes = [] |
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id = 0 |
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rr = re.compile(regex) |
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with open(self._filename,'r') as infile: |
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for line in infile: |
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ma = rr.match(line) |
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if ma: |
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indexes.append(id) |
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id += 1 |
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return indexes |
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|
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def search(self, txt): |
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indexes = [] |
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id = 0 |
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with open(self._filename,'r') as infile: |
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for line in infile: |
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if txt in line: |
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indexes.append(id) |
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id += 1 |
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return indexes</code></pre> |
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</details> |
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<h3>Instance variables</h3> |
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<dl> |
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<dt id="TermTk.TTkCore.filebuffer.TTkFileBuffer.indexUpdated"><code class="name">var <span class="ident">indexUpdated</span></code></dt> |
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<dd> |
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<div class="desc"><p>Return an attribute of instance, which is of type owner.</p></div> |
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</dd> |
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<dt id="TermTk.TTkCore.filebuffer.TTkFileBuffer.indexed"><code class="name">var <span class="ident">indexed</span></code></dt> |
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<dd> |
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<div class="desc"><p>Return an attribute of instance, which is of type owner.</p></div> |
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</dd> |
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</dl> |
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<h3>Methods</h3> |
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<dl> |
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<dt id="TermTk.TTkCore.filebuffer.TTkFileBuffer.createIndex"><code class="name flex"> |
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<span>def <span class="ident">createIndex</span></span>(<span>self)</span> |
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</code></dt> |
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<dd> |
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<div class="desc"></div> |
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<details class="source"> |
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<summary> |
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<span>Expand source code</span> |
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</summary> |
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<pre><code class="python">def createIndex(self): |
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# TTkLog.debug(f"Start Indexing {self._filename}") |
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indexes = [] |
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lines = 0 |
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offset = 0 |
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width = 0 |
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fileSize = os.stat(self._filename).st_size |
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chunkSize = 0x1000000 # ~16M |
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with open(self._filename,'r') as infile: |
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while (chunk:=infile.read(chunkSize)): |
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start = 0 |
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while (index:=chunk.find('\n',start))!=-1: |
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indexes.append(index+offset+1) |
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start = index+1 |
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self._indexesMutex.acquire() |
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self._indexes += indexes |
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self._pages += [None]*(1+(self.getLen()//self._window)-(len(self._pages))) |
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self._indexesMutex.release() |
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indexes = [] |
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offset+=len(chunk) |
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self.indexUpdated.emit(offset/fileSize) |
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# TTkLog.debug(f"{self._filename} {offset/fileSize} ...") |
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self._width = max([ (self._indexes[i+1]-self._indexes[i]) for i in range(len(self._indexes)-1) ]) |
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self.indexUpdated.emit(1.0) |
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self.indexed.emit()</code></pre> |
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</details> |
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</dd> |
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<dt id="TermTk.TTkCore.filebuffer.TTkFileBuffer.getLen"><code class="name flex"> |
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<span>def <span class="ident">getLen</span></span>(<span>self)</span> |
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</code></dt> |
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<dd> |
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<div class="desc"></div> |
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<details class="source"> |
|
<summary> |
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<span>Expand source code</span> |
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</summary> |
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<pre><code class="python">def getLen(self): |
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return len(self._indexes)</code></pre> |
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</details> |
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</dd> |
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<dt id="TermTk.TTkCore.filebuffer.TTkFileBuffer.getLine"><code class="name flex"> |
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<span>def <span class="ident">getLine</span></span>(<span>self, line)</span> |
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</code></dt> |
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<dd> |
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<div class="desc"></div> |
|
<details class="source"> |
|
<summary> |
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<span>Expand source code</span> |
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</summary> |
|
<pre><code class="python">def getLine(self, line): |
|
if line >= self.getLen(): |
|
return "" |
|
page = line//self._window |
|
offset = line%self._window |
|
if self._pages[page] == None: |
|
# Dispose of the pages to the bottom |
|
dispose = self._buffer.pop(0) |
|
if dispose is not None: |
|
self._pages[dispose.page] = None |
|
self._pages[page] = self._Page(page, self._window) |
|
self._buffer.append(self._pages[page]) |
|
self._indexesMutex.acquire() |
|
self._fd.seek(self._indexes[line-offset]) |
|
self._indexesMutex.release() |
|
buffer = self._pages[page].buffer |
|
for i in range(self._window): |
|
buffer[i] = self._fd.readline() |
|
#self._width = max(self._width,len(buffer[i])) |
|
else: |
|
# Push the page to the top of the buffer |
|
i = self._buffer.index(self._pages[page]) |
|
p = self._buffer.pop(i) |
|
self._buffer.append(p) |
|
return self._pages[page].buffer[offset]</code></pre> |
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</details> |
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</dd> |
|
<dt id="TermTk.TTkCore.filebuffer.TTkFileBuffer.getLineDirect"><code class="name flex"> |
|
<span>def <span class="ident">getLineDirect</span></span>(<span>self, line)</span> |
|
</code></dt> |
|
<dd> |
|
<div class="desc"></div> |
|
<details class="source"> |
|
<summary> |
|
<span>Expand source code</span> |
|
</summary> |
|
<pre><code class="python">def getLineDirect(self, line): |
|
if line >= self.getLen(): |
|
return "" |
|
self._indexesMutex.acquire() |
|
self._fd.seek(self._indexes[line]) |
|
self._indexesMutex.release() |
|
return self._fd.readline()</code></pre> |
|
</details> |
|
</dd> |
|
<dt id="TermTk.TTkCore.filebuffer.TTkFileBuffer.getSlice"><code class="name flex"> |
|
<span>def <span class="ident">getSlice</span></span>(<span>self, line, length)</span> |
|
</code></dt> |
|
<dd> |
|
<div class="desc"></div> |
|
<details class="source"> |
|
<summary> |
|
<span>Expand source code</span> |
|
</summary> |
|
<pre><code class="python">def getSlice(self, line, length): |
|
ret = [] |
|
for i in range(line, line+length): |
|
ret.append(self.getLine(i)) |
|
return ret</code></pre> |
|
</details> |
|
</dd> |
|
<dt id="TermTk.TTkCore.filebuffer.TTkFileBuffer.getWidth"><code class="name flex"> |
|
<span>def <span class="ident">getWidth</span></span>(<span>self, indexes=None)</span> |
|
</code></dt> |
|
<dd> |
|
<div class="desc"></div> |
|
<details class="source"> |
|
<summary> |
|
<span>Expand source code</span> |
|
</summary> |
|
<pre><code class="python">def getWidth(self, indexes=None): |
|
return self._width</code></pre> |
|
</details> |
|
</dd> |
|
<dt id="TermTk.TTkCore.filebuffer.TTkFileBuffer.search"><code class="name flex"> |
|
<span>def <span class="ident">search</span></span>(<span>self, txt)</span> |
|
</code></dt> |
|
<dd> |
|
<div class="desc"></div> |
|
<details class="source"> |
|
<summary> |
|
<span>Expand source code</span> |
|
</summary> |
|
<pre><code class="python">def search(self, txt): |
|
indexes = [] |
|
id = 0 |
|
with open(self._filename,'r') as infile: |
|
for line in infile: |
|
if txt in line: |
|
indexes.append(id) |
|
id += 1 |
|
return indexes</code></pre> |
|
</details> |
|
</dd> |
|
<dt id="TermTk.TTkCore.filebuffer.TTkFileBuffer.searchRe"><code class="name flex"> |
|
<span>def <span class="ident">searchRe</span></span>(<span>self, regex)</span> |
|
</code></dt> |
|
<dd> |
|
<div class="desc"></div> |
|
<details class="source"> |
|
<summary> |
|
<span>Expand source code</span> |
|
</summary> |
|
<pre><code class="python">def searchRe(self, regex): |
|
indexes = [] |
|
id = 0 |
|
rr = re.compile(regex) |
|
with open(self._filename,'r') as infile: |
|
for line in infile: |
|
ma = rr.match(line) |
|
if ma: |
|
indexes.append(id) |
|
id += 1 |
|
return indexes</code></pre> |
|
</details> |
|
</dd> |
|
</dl> |
|
</dd> |
|
</dl> |
|
</section> |
|
</article> |
|
<nav id="sidebar"> |
|
<h1>Index</h1> |
|
<div class="toc"> |
|
<ul></ul> |
|
</div> |
|
<ul id="index"> |
|
<li><h3>Super-module</h3> |
|
<ul> |
|
<li><code><a title="TermTk.TTkCore" href="index.html">TermTk.TTkCore</a></code></li> |
|
</ul> |
|
</li> |
|
<li><h3><a href="#header-classes">Classes</a></h3> |
|
<ul> |
|
<li> |
|
<h4><code><a title="TermTk.TTkCore.filebuffer.TTkFileBuffer" href="#TermTk.TTkCore.filebuffer.TTkFileBuffer">TTkFileBuffer</a></code></h4> |
|
<ul class="two-column"> |
|
<li><code><a title="TermTk.TTkCore.filebuffer.TTkFileBuffer.createIndex" href="#TermTk.TTkCore.filebuffer.TTkFileBuffer.createIndex">createIndex</a></code></li> |
|
<li><code><a title="TermTk.TTkCore.filebuffer.TTkFileBuffer.getLen" href="#TermTk.TTkCore.filebuffer.TTkFileBuffer.getLen">getLen</a></code></li> |
|
<li><code><a title="TermTk.TTkCore.filebuffer.TTkFileBuffer.getLine" href="#TermTk.TTkCore.filebuffer.TTkFileBuffer.getLine">getLine</a></code></li> |
|
<li><code><a title="TermTk.TTkCore.filebuffer.TTkFileBuffer.getLineDirect" href="#TermTk.TTkCore.filebuffer.TTkFileBuffer.getLineDirect">getLineDirect</a></code></li> |
|
<li><code><a title="TermTk.TTkCore.filebuffer.TTkFileBuffer.getSlice" href="#TermTk.TTkCore.filebuffer.TTkFileBuffer.getSlice">getSlice</a></code></li> |
|
<li><code><a title="TermTk.TTkCore.filebuffer.TTkFileBuffer.getWidth" href="#TermTk.TTkCore.filebuffer.TTkFileBuffer.getWidth">getWidth</a></code></li> |
|
<li><code><a title="TermTk.TTkCore.filebuffer.TTkFileBuffer.indexUpdated" href="#TermTk.TTkCore.filebuffer.TTkFileBuffer.indexUpdated">indexUpdated</a></code></li> |
|
<li><code><a title="TermTk.TTkCore.filebuffer.TTkFileBuffer.indexed" href="#TermTk.TTkCore.filebuffer.TTkFileBuffer.indexed">indexed</a></code></li> |
|
<li><code><a title="TermTk.TTkCore.filebuffer.TTkFileBuffer.search" href="#TermTk.TTkCore.filebuffer.TTkFileBuffer.search">search</a></code></li> |
|
<li><code><a title="TermTk.TTkCore.filebuffer.TTkFileBuffer.searchRe" href="#TermTk.TTkCore.filebuffer.TTkFileBuffer.searchRe">searchRe</a></code></li> |
|
</ul> |
|
</li> |
|
</ul> |
|
</li> |
|
</ul> |
|
</nav> |
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<p>Generated by <a href="https://pdoc3.github.io/pdoc"><cite>pdoc</cite> 0.9.2</a>.</p> |
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