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[formatter] implement slice operator as format specifier

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this allows using a slice operator alongside other (special) format
specifiers like J, to first join list elements to a string and then
trimming that with a slice.

{tags:J, /[:50]}
This commit is contained in:
Mike Fährmann
2022-06-25 16:45:34 +02:00
parent 241e82e18d
commit 54525d2e21
3 changed files with 48 additions and 7 deletions
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20
test/test_formatter.py
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@@ -1,7 +1,7 @@
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2021 Mike Fährmann
# Copyright 2021-2022 Mike Fährmann
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
@@ -135,6 +135,21 @@ class TestFormatter(unittest.TestCase):
self._run_test("{a[:50:2]}", v[:50:2])
self._run_test("{a[::]}" , v)
self._run_test("{a:[1:10]}" , v[1:10])
self._run_test("{a:[-10:-1]}", v[-10:-1])
self._run_test("{a:[5:]}" , v[5:])
self._run_test("{a:[50:]}", v[50:])
self._run_test("{a:[:5]}" , v[:5])
self._run_test("{a:[:50]}", v[:50])
self._run_test("{a:[:]}" , v)
self._run_test("{a:[1:10:2]}" , v[1:10:2])
self._run_test("{a:[-10:-1:2]}", v[-10:-1:2])
self._run_test("{a:[5::2]}" , v[5::2])
self._run_test("{a:[50::2]}", v[50::2])
self._run_test("{a:[:5:2]}" , v[:5:2])
self._run_test("{a:[:50:2]}", v[:50:2])
self._run_test("{a:[::]}" , v)
def test_maxlen(self):
v = self.kwdict["a"]
self._run_test("{a:L5/foo/}" , "foo")
@@ -177,6 +192,9 @@ class TestFormatter(unittest.TestCase):
# join-and-replace
self._run_test("{l:J-/Rb/E/}", "a-E-c")
# join and slice
self._run_test("{l:J-/[1:-1]}", "-b-")
# optional-and-maxlen
self._run_test("{d[a]:?</>/L1/too long/}", "<too long>")
self._run_test("{d[c]:?</>/L5/too long/}", "")