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import typing as t
# The generic time format is based on python time.strftime.
# https://docs.python.org/3/library/time.html#time.strftime
from sqlglot.trie import in_trie, new_trie
def format_time(
string: str, mapping: t.Dict[str, str], trie: t.Optional[t.Dict] = None
) -> t.Optional[str]:
"""
Converts a time string given a mapping.
Examples:
>>> format_time("%Y", {"%Y": "YYYY"})
'YYYY'
Args:
mapping: dictionary of time format to target time format.
trie: optional trie, can be passed in for performance.
Returns:
The converted time string.
"""
if not string:
return None
start = 0
end = 1
size = len(string)
trie = trie or new_trie(mapping)
current = trie
chunks = []
sym = None
while end <= size:
chars = string[start:end]
result, current = in_trie(current, chars[-1])
if result == 0:
if sym:
end -= 1
chars = sym
sym = None
start += len(chars)
chunks.append(chars)
current = trie
elif result == 2:
sym = chars
end += 1
if result and end > size:
chunks.append(chars)
return "".join(mapping.get(chars, chars) for chars in chunks)
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