On 2017-04-22 23:30, Mikhail V wrote:
On 20 April 2017 at 23:54, MRAB <pyt...@mrabarnett.plus.com> wrote:
> On 2017-04-20 22:03, Mikhail V wrote:
>>
>> On 20 April 2017 at 22:43, Random832 <random...@fastmail.com> wrote:
>>> [snip]
>>>
>>> The best solution I can think of is to have a text editor designed to
>>> parse a string literal, spawn a nested editor with the unescaped
>>> contents of that string literal, and then re-escape it back to place in
>>> the code. If we had that, then we wouldn't even need raw strings.
>>
>>
>> Yes exactly, it would be cool to have such a satellite app
>> which can escape and unescape strings according to rules.
>> And which can also convert unicode literals to their ascii
>> analogues and back on the fly, this would very useful
>> for programming.
>> Probably it is a good idea to even include such thing
>> in Python package. So it would be a small standalone app
>> running parallel with text editor making it to copy paste strings.
>>
> I'm sure it's possible in, say, Emacs.
>
> The editor that I use (EditPad Pro) can call external tools, so I could:
>
> 1. Select the string literal (easy when it is syntax-aware, so I can select
> all of the literal with 2 keypresses).
>
> 2. Call the external tool (1 keypress), to open, say, a simple tkinter app.
>
> 3. Edit the unescaped text (unescape with ast.literal_eval, re-escape with
> 'ascii').
>
> 4. Close the external tool, and the selection is replaced.
I have done a quick google search and could not find
such utility for Python.
I am very interested in having such utility.
And I think it would be fair that such utility
should be made by the Python team so that
all syntax nuances will be correctly implemented.
The purpose is simple: reduce manual work to escape special
characters in string literals (and escape non-ASCII characters).
Simple usage scenario:
- I have a long command-line string in some text editor.
- Copy this string and paste into the utility edit box
- In the second edit box same string with escaped characters
appears (i.e tab becomes \t, etc)
- Further, if I edit the text in the second edit box,
an unescaped string appears in the first box.
Possible toggle options, e.g. :
- 'asciify' non-ascii characters
It could be not only useful to eliminate boilerplate typing,
but also a great way to learn string rules for Python learners.
Here's a very simple tkinter GUI app. It only goes one way (plain to
escaped (asciified)), but it shows what's possible with very little code.
#! python3.6
# -*- coding: utf-8 -*-
import tkinter as tk
class App(tk.Tk):
def __init__(self):
tk.Tk.__init__(self)
self.title('Escaper')
tk.Label(self, text='Plain string').pack()
self.plain_box = tk.Text(self)
self.plain_box.pack()
self.plain_box.focus()
tk.Label(self, text='Escaped string').pack()
self.escaped_box = tk.Text(self)
self.escaped_box.pack()
self.after(100, self.on_tick)
def on_tick(self):
plain_string = self.plain_box.get('1.0', 'end')[ : -1]
escaped_string = ascii(plain_string)
self.escaped_box.delete('1.0', 'end')
self.escaped_box.insert('1.0', escaped_string)
self.after(100, self.on_tick)
App().mainloop()
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