intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 64 insertions, 0 deletions

diff --git a/library/python/testing/yatest_lib/tools.py b/library/python/testing/yatest_lib/tools.py
new file mode 100644
index 0000000000..b72d79c162
--- /dev/null
+++ b/library/python/testing/yatest_lib/tools.py
@@ -0,0 +1,64 @@
+import six
+import sys
+
+
+def to_utf8(value):
+    """
+    Converts value to string encoded into utf-8
+    :param value:
+    :return:
+    """
+    if sys.version_info[0] < 3:
+        if not isinstance(value, basestring):  # noqa
+            value = unicode(value)  # noqa
+        if type(value) == str:
+            value = value.decode("utf-8", errors="ignore")
+        return value.encode('utf-8', 'ignore')
+    else:
+        return str(value)
+
+
+def trim_string(s, max_bytes):
+    """
+    Adjusts the length of the string s in order to fit it
+    into max_bytes bytes of storage after encoding as UTF-8.
+    Useful when cutting filesystem paths.
+    :param s: unicode string
+    :param max_bytes: number of bytes
+    :return the prefix of s
+    """
+    if isinstance(s, six.text_type):
+        return _trim_unicode_string(s, max_bytes)
+
+    if isinstance(s, six.binary_type):
+        if len(s) <= max_bytes:
+            return s
+        s = s.decode('utf-8', errors='ignore')
+        s = _trim_unicode_string(s, max_bytes)
+        s = s.encode('utf-8', errors='ignore')
+        return s
+
+    raise TypeError('a string is expected')
+
+
+def _trim_unicode_string(s, max_bytes):
+    if len(s) * 4 <= max_bytes:
+        # UTF-8 uses at most 4 bytes per character
+        return s
+
+    result = []
+    cur_byte_length = 0
+
+    for ch in s:
+        cur_byte_length += len(ch.encode('utf-8'))
+        if cur_byte_length > max_bytes:
+            break
+        result.append(ch)
+
+    return ''.join(result)
+
+
+def to_str(s):
+    if six.PY2 and isinstance(s, six.text_type):
+        return s.encode('utf8')
+    return s