Snippet for delimiters for LaTeX

[Dror Atariah]

In LaTeX you have several options for delimiters:

\left< \right>

\left( \right)

\left\{ \right\}

...

I want to write a snippet which will expand to these delimiters; I want it to be interactive, namely using "yas/choose-value". I encounter two problems:

1. Say that I chose the "<" delimiter, then at the end of the expression ">" should appear. How can I do it?

2. The second problem relates to the usage of chars like "{" and "(". Is the following: ${2:$$(yas/choose-value '("<" "\{" "("))} valid?

Thanks!

[Anders Eurenius]

Well, there is a trick for part 1, here's one of my snippets:
----
# -*- mode: snippet -*-
# name: ix
# binding: 。
# --
[${1:`(cond
((string-match "^[+-]?[0-9]+$" yas/selected-text) "")
((string-match "'" yas/selected-text) "\"")
(t "'")
)`}${1:`yas/selected-text`}${1:`(cond
((string-match "^[+-]?[0-9]+$" yas/selected-text) "")
((string-match "'" yas/selected-text) "\"")
(t "'")
)`}]$0
----
So, basically, you'd do something like ${2:`(cond ...)`} and give ">"
if yas/text is "<". (my snippet examines the selected text.)

aes

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[João Távora]

Hi!

You want something like

# -*- mode: snippet -*-

# name: lr
# key: lr
# --
\\left${1:$$(yas/choose-value '("{" "("
"["))}\\right${1:$(yas/latex-closing-delimiter-for yas/text)}

while having this function defined somewhere (latex-mode/.yas-setup.el
is recommended)

(defun yas/latex-closing-delimiter-for (text)
(cond ((string= text "{") "}")
((string= text "[") "]")
((string= text "(") ")")))

This might need some tweaking if you decide to enter gibberish instead
of an opening delimiter in $1.

João

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--
João Távora

[OMF]

Just to mention an alternative method not involving a choice function but rather using multiple snippets, I use the following four separate snippets for brackets (includes vertical brackets)

# -*- mode: snippet -*-

# key: {
# group: math
# name: {}
# --
\left\{ $1 \right\}$0

# -*- mode: snippet -*-

# key: [
# group: math
# name: []
# --
\left[ $1 \right]$0

# -*- mode: snippet -*-

# key: |
# group: math
# name: ||
# --
\lvert $1 \rvert$0

# -*- mode: snippet -*-

# key: (
# group: math
# name: ()
# --
\left( $1 \right)$0

[Dror Atariah]

KISS... I guess this is the solution I will take. Simple, easy to maintain... Thanks for the joint effort!

Cheers.

Dror