Veronica K. B. Olsen
243 lines
8.2 KiB
Python
243 lines
8.2 KiB
Python
# -*- coding: utf-8 -*-
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"""novelWriter Text Tokenizer
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novelWriter – Text Tokenizer
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==============================
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Splits a piece of nW markdown text into its elements
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File History:
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Created: 2019-05-05 [0.0.1]
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"""
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import textwrap
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import logging
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import re
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import nw
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from operator import itemgetter
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from PyQt5.QtCore import QRegularExpression
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from nw.project.document import NWDoc
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logger = logging.getLogger(__name__)
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class Tokenizer():
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FMT_B_B = "" # Begin bold
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FMT_B_E = "" # End bold
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FMT_I_B = "" # Begin italics
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FMT_I_E = "" # End italics
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FMT_U_B = "" # Begin underline
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FMT_U_E = "" # End underline
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T_EMPTY = 1 # Empty line (new paragraph)
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T_COMMENT = 2 # Comment line
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T_COMMAND = 3 # Command line
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T_HEAD1 = 4 # Header 1 (title)
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T_HEAD2 = 5 # Header 2 (chapter)
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T_HEAD3 = 6 # Header 3 (scene)
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T_HEAD4 = 7 # Header 4
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T_TEXT = 8 # Text line
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def __init__(self, theProject, theParent):
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self.mainConf = nw.CONFIG
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self.theProject = theProject
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self.theParent = theParent
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self.theText = None
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self.theHandle = None
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self.theItem = None
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self.theTokens = None
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self.theResult = None
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self.wordWrap = 80
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self.doComments = False
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self.doCommands = False
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return
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##
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# Setters
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##
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def setComments(self, doComments):
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self.doComments = doComments
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return
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def setCommands(self, doCommands):
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self.doCommands = doCommands
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return
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def setWordWrap(self, wordWrap):
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if wordWrap >= 0:
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self.wordWrap = wordWrap
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else:
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self.wordWrap = 0
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return
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##
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# Class Methods
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##
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def setText(self, theHandle, theText=None):
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self.theHandle = theHandle
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self.theItem = self.theProject.getItem(theHandle)
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if theText is not None:
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# If the text is set, just use that
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self.theText = theText
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else:
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# Otherwise, load it from file
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theDocument = NWDoc(self.theProject, self.theParent)
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self.theText = theDocument.openDocument(theHandle)
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return
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def doAutoReplace(self):
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if len(self.theProject.autoReplace) > 0:
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repDict = {}
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for aKey, aVal in self.theProject.autoReplace.items():
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repDict["<%s>" % aKey] = aVal
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xRep = re.compile("|".join([re.escape(k) for k in repDict.keys()]), flags=re.DOTALL)
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self.theText = xRep.sub(lambda x: repDict[x.group(0)], self.theText)
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return
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def tokenizeText(self):
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"""Scan the text for either lines starting with specific characters that indicate headers,
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comments, commands etc, or just contains plain text. in the case of plain text, apply the
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same RegExes that the syntax highlighter uses and save the locations of these formatting
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tags into the token array.
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"""
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# RegExes for adding formatting tags within text lines
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# Keep in sync with the DocHighlighter class
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rxFormats = [(
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QRegularExpression(r"(?<![\w|\\])([\*]{2})(?!\s)(?m:(.+?))(?<![\s|\\])(\1)(?!\w)"),
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[None, self.FMT_B_B, None, self.FMT_B_E]
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),(
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QRegularExpression(r"(?<![\w|_|\\])([_])(?!\s|\1)(?m:(.+?))(?<![\s|\\])(\1)(?!\w)"),
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[None, self.FMT_I_B, None, self.FMT_I_E]
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),(
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QRegularExpression(r"(?<![\w|\\])([_]{2})(?!\s)(?m:(.+?))(?<![\s|\\])(\1)(?!\w)"),
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[None, self.FMT_U_B, None, self.FMT_U_E]
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)]
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self.theTokens = []
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for aLine in self.theText.splitlines():
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aLine = aLine.strip()
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# Tag lines starting with specific characters
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if len(aLine) == 0:
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self.theTokens.append((self.T_EMPTY,"",None))
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elif aLine[0] == "%":
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self.theTokens.append((self.T_COMMENT,aLine[1:].strip(),None))
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elif aLine[0] == "@":
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self.theTokens.append((self.T_COMMENT,aLine[1:].strip(),None))
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elif aLine[:2] == "# ":
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self.theTokens.append((self.T_HEAD1,aLine[2:].strip(),None))
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elif aLine[:3] == "## ":
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self.theTokens.append((self.T_HEAD2,aLine[3:].strip(),None))
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elif aLine[:4] == "### ":
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self.theTokens.append((self.T_HEAD3,aLine[4:].strip(),None))
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elif aLine[:5] == "#### ":
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self.theTokens.append((self.T_HEAD4,aLine[5:].strip(),None))
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else:
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# Otherwise we use RegEx to find formatting tags within a line of text
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fmtPos = []
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for theRX, theKeys in rxFormats:
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rxThis = theRX.globalMatch(aLine, 0)
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while rxThis.hasNext():
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rxMatch = rxThis.next()
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for n in range(1,len(theKeys)):
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if theKeys[n] is not None:
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xPos = rxMatch.capturedStart(n)
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xLen = rxMatch.capturedLength(n)
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fmtPos.append([xPos,xLen,theKeys[n]])
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# Save the line as is, but append the array of formatting locations sorted by position
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fmtPos = sorted(fmtPos,key=itemgetter(0))
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self.theTokens.append((self.T_TEXT,aLine,fmtPos))
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# Always add an empty line at the end
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self.theTokens.append((self.T_EMPTY,"",None))
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return
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def doConvert(self):
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"""Converts the tokenized text into plain text.
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"""
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if self.wordWrap > 0:
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tWrap = textwrap.TextWrapper(
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width = self.wordWrap,
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initial_indent = "",
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subsequent_indent = "",
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expand_tabs = True,
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replace_whitespace = True,
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fix_sentence_endings = False,
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break_long_words = True,
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drop_whitespace = True,
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break_on_hyphens = True,
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tabsize = 8,
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max_lines = None
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)
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self.theResult = ""
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thisPar = []
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for tType, tText, tFormat in self.theTokens:
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# First check if we have a comment or plain text, as they need some
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# extra replacing before we proceed to wrapping and final formatting.
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if tType == self.T_COMMAND:
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tText = "[%s]" % tText
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elif tType == self.T_TEXT:
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tTemp = tText
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for xPos, xLen, xFmt in reversed(tFormat):
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tTemp = tTemp[:xPos]+tTemp[xPos+xLen:]
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tText = tTemp
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tLen = len(tText)
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# The text can now be word wrapped, if we have requested this and it's needed.
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if self.wordWrap > 0 and tLen > self.wordWrap:
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tText = tWrap.fill(tText)
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# Then the text can receive final formatting before we append it to the results.
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# We also store text lines in a buffer and merge them only when we find an empty line,
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# indicating a new paragraph.
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if tType == self.T_EMPTY:
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if len(thisPar) > 0:
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self.theResult += "%s\n\n" % " ".join(thisPar)
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thisPar = []
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elif tType == self.T_HEAD1:
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uLine = "="*min(tLen,self.wordWrap)
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self.theResult += "%s\n%s\n\n" % (tText,uLine)
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elif tType == self.T_HEAD2:
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uLine = "~"*min(tLen,self.wordWrap)
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self.theResult += "%s\n%s\n\n" % (tText,uLine)
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elif tType == self.T_HEAD3:
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uLine = "-"*min(tLen,self.wordWrap)
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self.theResult += "%s\n%s\n\n" % (tText,uLine)
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elif tType == self.T_HEAD4:
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self.theResult += "%s\n\n" % tText
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elif tType == self.T_TEXT:
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thisPar.append(tText)
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elif tType == self.T_COMMENT and self.doComments:
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self.theResult += "%s\n\n" % tText
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elif tType == self.T_COMMAND and self.doCommands:
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self.theResult += "%s\n\n" % tText
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return
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# END Class Tokenizer
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