From ad4bf818fab563a9e668b54829b5cc3486665d4a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Beat=20J=C3=A4ckle?= <beat@git.jdmweb2.ch>
Date: Wed, 11 May 2022 20:00:30 +0200
Subject: [PATCH] CutWords

---
 cutwords.py | 113 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 cutwords.py

diff --git a/cutwords.py b/cutwords.py
new file mode 100644
index 0000000..8c7308c
--- /dev/null
+++ b/cutwords.py
@@ -0,0 +1,113 @@
+#
+# takes any length string, returns of list strings with each 128 words
+# SPDX-FileCopyrightText: 2022 Beat Jäckle <beat@git.jdmweb2.ch>
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+import re
+
+class CutWords:
+    def __init__(self, string, maxlen=128, mode=None):
+        self.setMaxlen(maxlen)
+        self.setString(string)
+        self.setMode(mode)
+
+    def __call__(self):
+        return self.getBlocks()
+
+    def setMode(self, mode):
+        self.mode = mode
+        self.seperators = None
+        self.blocks = None
+
+    def setMaxlen(self, maxlen):
+        self.maxlen = maxlen
+        self.seperators = None
+        self.blocks = None
+
+    def setString(self, string):
+        self.string = string
+        self.words = string.split()
+        self.seperators = None
+        self.blocks = None
+
+    def getBlocks(self, mode=None):
+        if self.blocks is None:
+            self.makeBlocks()
+        if mode == 'strings':
+            return [' '.join(b) for b in self.blocks]
+        return self.blocks
+
+    def makeBlocks(self):
+        if self.seperators is None:
+            self.makeSeperators(mode='points')
+        blocks = []
+        lastSeperator = 0
+        for seperator in self.seperators:
+            blocks.append(self.words[lastSeperator:seperator])
+            lastSeperator = seperator
+        blocks.append(self.words[lastSeperator:])
+        self.blocks = blocks
+        return blocks
+
+    def makeSeperators(self, mode=None):
+        self.seperators = self.findSeperators(
+            mode=mode
+            )
+
+    def findSeperators(self, mode=None):
+        if mode is None:
+            mode = 'points'
+        if mode == 'even':
+            nseperators = (len(self.words)-1)//self.maxlen
+            return [
+                len(self.words)//nseperators*(i+1)
+                for i in range(nseperators)
+                ]
+        if mode == 'points':
+            seperators = []
+            lastSeperator = 0
+            while lastSeperator + self.maxlen < len(self.words):
+                for i in range(1, self.maxlen):
+                    index = lastSeperator+self.maxlen-i
+                    #if the word ends with ?! or a .
+                    if re.search('^[\w]*[\.\?!]$', self.words[index]):
+                        lastSeperator = index+1
+                        seperators.append(index+1)
+                        break
+                if lastSeperator < index:
+                    print('WARNING CutWords: No points found')
+                    print(f"WARNING: string = {self.string[:40]}")
+                    print(
+                        f"WARNING: position {lastSeperator} = "
+                        f"{self.string[lastSeperator:lastSeperator+20]}...")
+                    lastSeperator = lastSeperator + self.maxlen
+                    seperators.append(lastSeperator)
+
+            # print(f"Seperates in {len(seperators)+1} blocks by points."+\
+                # f"Needed minimum {(len(self.words)-1)//self.maxlen+1}.")
+            return seperators
+        raise Exception(f"CutWords: mode = {mode} is unknown.")
+
+    def __getitem__(self, i):
+        if self.blocks is None:
+            self.makeBlocks()
+        return ' '.join(self.blocks[i])
+
+    def __iter__(self):
+        if self.blocks is None:
+            self.makeBlocks()
+        self.indexlast = -1
+        return self
+
+    def __next__(self):
+        try:
+            self.indexlast += 1
+            return self.__getitem__(self.indexlast)
+        except IndexError:
+            raise StopIteration
+            return None
+
+    def __len__(self):
+        if self.blocks is None:
+            self.makeBlocks()
+        return len(self.blocks)