optimize scolling visual effect

shared_utils/char_visual_effect.py

@@ -0,0 +1,25 @@
+def is_full_width_char(ch):
+    """判断给定的单个字符是否是全角字符"""
+    if '\u4e00' <= ch <= '\u9fff':
+        return True  # 中文字符
+    if '\uff01' <= ch <= '\uff5e':
+        return True  # 全角符号
+    if '\u3000' <= ch <= '\u303f':
+        return True  # CJK标点符号
+    return False
+
+def scolling_visual_effect(text, scroller_max_len):
+    text = text.\
+            replace('\n', '').replace('`', '.').replace(' ', '.').replace('<br/>', '.....').replace('$', '.')
+    place_take_cnt = 0
+    pointer = len(text) - 1
+
+    if len(text) < scroller_max_len:
+        return text
+
+    while place_take_cnt < scroller_max_len and pointer > 0:
+        if is_full_width_char(text[pointer]): place_take_cnt += 2
+        else: place_take_cnt += 1
+        pointer -= 1
+
+    return text[pointer:]