From 25d53e77c057835c08122590cd8a1c90bb69c831 Mon Sep 17 00:00:00 2001
From: wl-zhao <zhaowl20@mails.tsinghua.edu.cn>
Date: Mon, 11 Mar 2024 02:14:05 +0000
Subject: [PATCH] improve split sentence

---
 melo/split_utils.py | 69 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 67 insertions(+), 2 deletions(-)

diff --git a/melo/split_utils.py b/melo/split_utils.py
index 6379be3..7f2bcf9 100644
--- a/melo/split_utils.py
+++ b/melo/split_utils.py
@@ -4,7 +4,7 @@ import glob
 import numpy as np
 import soundfile as sf
 import torchaudio
-from txtsplit import txtsplit
+import re
 
 def split_sentence(text, min_len=10, language_str='EN'):
     if language_str in ['EN', 'FR', 'ES', 'SP']:
@@ -13,13 +13,15 @@ def split_sentence(text, min_len=10, language_str='EN'):
         sentences = split_sentences_zh(text, min_len=min_len)
     return sentences
 
+
 def split_sentences_latin(text, min_len=10):
     text = re.sub('[。！？；]', '.', text)
     text = re.sub('[，]', ',', text)
     text = re.sub('[“”]', '"', text)
     text = re.sub('[‘’]', "'", text)
     text = re.sub(r"[\<\>\(\)\[\]\"\«\»]+", "", text)
-    return [item.strip() for item in txtsplit(text, 512, 512) if item.strip()]
+    return [item.strip() for item in txtsplit(text, 256, 512) if item.strip()]
+
 
 def split_sentences_zh(text, min_len=10):
     text = re.sub('[。！？；]', '.', text)
@@ -45,6 +47,7 @@ def split_sentences_zh(text, min_len=10):
             new_sent = []
     return merge_short_sentences_zh(new_sentences)
 
+
 def merge_short_sentences_en(sens):
     """Avoid short sentences by merging them with the following sentence.
 
@@ -70,6 +73,7 @@ def merge_short_sentences_en(sens):
         pass
     return sens_out
 
+
 def merge_short_sentences_zh(sens):
     # return sens
     """Avoid short sentences by merging them with the following sentence.
@@ -97,6 +101,67 @@ def merge_short_sentences_zh(sens):
     return sens_out
 
 
+
+def txtsplit(text, desired_length=100, max_length=200):
+    """Split text it into chunks of a desired length trying to keep sentences intact."""
+    text = re.sub(r'\n\n+', '\n', text)
+    text = re.sub(r'\s+', ' ', text)
+    text = re.sub(r'[""]', '"', text)
+    text = re.sub(r'([,.?!])', r'\1 ', text)
+    text = re.sub(r'\s+', ' ', text)
+    
+    rv = []
+    in_quote = False
+    current = ""
+    split_pos = []
+    pos = -1
+    end_pos = len(text) - 1
+    def seek(delta):
+        nonlocal pos, in_quote, current
+        is_neg = delta < 0
+        for _ in range(abs(delta)):
+            if is_neg:
+                pos -= 1
+                current = current[:-1]
+            else:
+                pos += 1
+                current += text[pos]
+            if text[pos] == '"':
+                in_quote = not in_quote
+        return text[pos]
+    def peek(delta):
+        p = pos + delta
+        return text[p] if p < end_pos and p >= 0 else ""
+    def commit():
+        nonlocal rv, current, split_pos
+        rv.append(current)
+        current = ""
+        split_pos = []
+    while pos < end_pos:
+        c = seek(1)
+        if len(current) >= max_length:
+            if len(split_pos) > 0 and len(current) > (desired_length / 2):
+                d = pos - split_pos[-1]
+                seek(-d)
+            else:
+                while c not in '!?.\n ' and pos > 0 and len(current) > desired_length:
+                    c = seek(-1)
+            commit()
+        elif not in_quote and (c in '!?\n' or (c in '.,' and peek(1) in '\n ')):
+            while pos < len(text) - 1 and len(current) < max_length and peek(1) in '!?.':
+                c = seek(1)
+            split_pos.append(pos)
+            if len(current) >= desired_length:
+                commit()
+        elif in_quote and peek(1) == '"' and peek(2) in '\n ':
+            seek(2)
+            split_pos.append(pos)
+    rv.append(current)
+    rv = [s.strip() for s in rv]
+    rv = [s for s in rv if len(s) > 0 and not re.match(r'^[\s\.,;:!?]*$', s)]
+    return rv
+
+
 if __name__ == '__main__':
     zh_text = "好的，我来给你讲一个故事吧。从前有一个小姑娘，她叫做小红。小红非常喜欢在森林里玩耍，她经常会和她的小伙伴们一起去探险。有一天，小红和她的小伙伴们走到了森林深处，突然遇到了一只凶猛的野兽。小红的小伙伴们都吓得不敢动弹，但是小红并没有被吓倒，她勇敢地走向野兽，用她的智慧和勇气成功地制服了野兽，保护了她的小伙伴们。从那以后，小红变得更加勇敢和自信，成为了她小伙伴们心中的英雄。"
     en_text = "I didn’t know what to do. I said please kill her because it would be better than being kidnapped,” Ben, whose surname CNN is not using for security concerns, said on Wednesday. “It’s a nightmare. I said ‘please kill her, don’t take her there.’"