Re: Finding the correct map

On 03/31/2011 05:01 PM, carlosvillu wrote:
> I came from Textmate and i try to created a map that i was so
> useful for me. When i edit a file in insert mode, i want can
> press <shift>Left /<shift>Rigth for select caracter by
> caracter and <shift><cmd>Left<shift><cmd>Right to select word
> by word. Really I tried, but I don´t make work fine.

Assuming your vim can see that key-sequence (see note below), you 
can use

  :nnoremap <s-left> v<left>
  :nnoremap <s-right> v<right>
  :vnoremap <s-left> <left>
  :vnoremap <s-right> <right>

which should implement the behavior you expect.

-tim

NOTE:  to see if your Vim distinguishes between them, in either 
insert-mode or command-line (":"-prompt) mode, you can type 
control-V followed by shift-left.  Then try the same with 
control-V followed by plain-left and see if Vim sees the same 
key-sequence.  Alternatively in insert-mode, you can prefix the 
key-to-check with control-K to see the vim-key-code representation.

   :help i_CTRL-V
   :help i_CTRL-K

--

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Regular Expression Help

Hi, all.

I have a problem building a regular expression for fields in a SQL UPDATE
statement. The SET clause has the format as follows:

field1 = 'value of field1', field2 = 'field\' 2 value'

I have built a regular expression that can split the name of fields from its
values. But when a value has an escaped single-quote the regular expression
fails. I know that it fails because I am using the expression [^'] in between
the parenthesis. But how to fix this?

This is the regular expression I am using:

/(\w+)\s*=\s*(('[^']*'\s*,)|(\d+\s*,))\s*/i

Could someone help me with that?

Alessandro Antonello

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Re: Regular Expression Help

On 01/04/11 07:35, Alessandro Antonello wrote:
> Hi, all.
>
> I have a problem building a regular expression for fields in a SQL UPDATE
> statement. The SET clause has the format as follows:
>
> field1 = 'value of field1', field2 = 'field\' 2 value'
>
> I have built a regular expression that can split the name of fields from its
> values. But when a value has an escaped single-quote the regular expression
> fails. I know that it fails because I am using the expression [^'] in between
> the parenthesis. But how to fix this?
>
> This is the regular expression I am using:
>
> /(\w+)\s*=\s*(('[^']*'\s*,)|(\d+\s*,))\s*/i
>
> Could someone help me with that?
>
> Alessandro Antonello
>

I think you could use non-greedy matching i.e. .\{-} and end at (or 
maybe just before) a single quote not preceded by a backslash (maybe end 
the pattern with [^\\]' if there must be at least one character between 
the quotes).

See
	:help non-greedy
	:help /[]

why remap <C-;> is not working

What is supposed to happen if there is an error in a vim script?

> However none of you answered,
  > anywhere in the available documentation?
  > Not just mentioned in passing by an example!

  > Where are the rules for this detailed?

Actually the documentation does describe, in detail, the rules for handling 
errors, exceptions, and interrupts -- if the author of a script encloses it in 
a ``try'' block. You can find these explanations in the document eval.txt in 
Section 8 ``Exception Handling''. You can also use help commands to locate 
descriptionfor the ``catch'' ``throw'' and ``finally'' commands within 
``try'' and ``endtry'' blocks.

I had to deal with this recently myself when I wrote a few scripts,.
Frankly, I found these rules unnecessarily complex and, well, arcane compared 
to error handling in other script languages (e.g., unix shells).

Vim provides a set of rules for the Author of a script to deal with errors, 
should he or she choose to do so. However, if the author does not use the 
``try'' mechanism - I fear errors are handled -well - however the developers 
happened to handle each particular error. Generally, error messages are 
displayed and some action may or may not be taken.

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Re: Regular Expression Help

Hi,

Alessandro Antonello wrote:
> 
> I have a problem building a regular expression for fields in a SQL UPDATE
> statement. The SET clause has the format as follows:
> 
> field1 = 'value of field1', field2 = 'field\' 2 value'
> 
> I have built a regular expression that can split the name of fields from its
> values. But when a value has an escaped single-quote the regular expression
> fails. I know that it fails because I am using the expression [^'] in between
> the parenthesis. But how to fix this?
> 
> This is the regular expression I am using:
> 
> /(\w+)\s*=\s*(('[^']*'\s*,)|(\d+\s*,))\s*/i
> 
> Could someone help me with that?

there are some problems with your regular expression: first, Vim needs a
lot of backslashes where Perl or other regexp variants do not. You can
fix this by putting \v inside your regexp (see ":help /\v"). As a
consequence you now have to prefix the equal sign with a backslash:

  /\v(\w+)\s*\=\s*(('[^']*'\s*,)|(\d+\s*,))\s*/i

Now you want to match single quoted strings which might include a
backlash-escaped single quote. That means "'[^']'*" is not enough;
inside your string everything but single quotes should be allowed, or
alternative a backslash-escaped single quote. This leads us to
"'([^']|\\')*'" for a string:

  /\v(\w+)\s*\=\s*(('([^']|\\')*'\s*,)|(\d+\s*,))\s*/i

This still won't match you example, because "\s*," is expected after
every string or number. First lets move them out of the parentheses:

  /\v(\w+)\s*\=\s*(('([^']|\\')*')|(\d+))\s*,\s*/i

Now you have to decide: do you want this regular expression to match a
single field or a list of fields. A single field is (almost) easy: just
strip "\s*,\s*" from the end:

  /\v(\w+)\s*\=\s*(('([^']|\\')*')|(\d+))/i

Both fields in your example get matched now, but the second match is too
short. This is due to the way alternatives are tested. You can fix this
by swapping "[^']" and "\\'":

  /\v(\w+)\s*\=\s*(('(\\'|[^'])*')|(\d+))/i

This correctly matches both fields. Before we continue lets get rid of
some superfluous parentheses. You don't need them around the
alternatives as long as the whole alternation is wrapped with
parentheses:

  /\v(\w+)\s*\=\s*('(\\'|[^'])*'|\d+)/i

If you want to match a list of fields you must consider that there might
be no trailing comma after the last field of the list or -- expressed in
a slightly different way -- that every field has a leading comma except
the first one. For a list only one field is needed; more fields are
optional and separated from their predecessors with (optional) whitespace,
a comma, and (again optional) whitespace:

  /\v(\w+)\s*\=\s*('(\\'|[^'])*'|\d+)(\s*,\s*\v(\w+)\s*\=\s*('(\\'|[^'])*'|\d+))*

That's it.

Regards,
Jürgen

-- 
Sometimes I think the surest sign that intelligent life exists elsewhere
in the universe is that none of it has tried to contact us.     (Calvin)

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bracket indent question

Re: How to use color to search

Alternatively, the SyntaxMotion script: http://www.vim.org/scripts/script.php?script_id=2965

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Re: Regular Expression Help

Re: Regular Expression Help