<h2>Editing File: /usr/lib/python3.6/site-packages/dns/ttl.py</h2><form method='post'><textarea name='content' class='file-edit'># Copyright (C) 2003-2007, 2009-2011 Nominum, Inc.
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&quot;&quot;&quot;DNS TTL conversion.&quot;&quot;&quot;

import dns.exception
from ._compat import long


class BadTTL(dns.exception.SyntaxError):

    &quot;&quot;&quot;DNS TTL value is not well-formed.&quot;&quot;&quot;


def from_text(text):
    &quot;&quot;&quot;Convert the text form of a TTL to an integer.

    The BIND 8 units syntax for TTLs (e.g. '1w6d4h3m10s') is supported.

    @param text: the textual TTL
    @type text: string
    @raises dns.ttl.BadTTL: the TTL is not well-formed
    @rtype: int
    &quot;&quot;&quot;

    if text.isdigit():
        total = long(text)
    else:
        if not text[0].isdigit():
            raise BadTTL
        total = long(0)
        current = long(0)
        for c in text:
            if c.isdigit():
                current *= 10
                current += long(c)
            else:
                c = c.lower()
                if c == 'w':
                    total += current * long(604800)
                elif c == 'd':
                    total += current * long(86400)
                elif c == 'h':
                    total += current * long(3600)
                elif c == 'm':
                    total += current * long(60)
                elif c == 's':
                    total += current
                else:
                    raise BadTTL(&quot;unknown unit '%s'&quot; % c)
                current = 0
        if not current == 0:
            raise BadTTL(&quot;trailing integer&quot;)
    if total &lt; long(0) or total &gt; long(2147483647):
        raise BadTTL(&quot;TTL should be between 0 and 2^31 - 1 (inclusive)&quot;)
    return total
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