Yasnippet conditional expansion

Consider the following snippets: `# -*- mode: snippet -*- # name: tdp # key: ^^ # group: math # condition: (and (texmathp) 'auto) # -- ^{$1}$0 and # -*- mode: snippet -*- # name: set # key: set # group: math # condition: (and (texmathp) 'auto) # -- \\{ $1 \\} I would like to expand on different conditions. By default Yasnippet only expands at word boundaries, so for example fooset doesn't expand, you have to type a space between the snippet that you want to expand. As you can see this is a problem with the first snippet because I would like to expand x\^\^3 to x\^{3}. I looked for a solution to this problem and found this (setq yas-key-syntaxes '(yas-longest-key-from-whitespace "w_.()" "w_." "w_" "w")) which let's me expand snippet on non-word boundaries. So now I can expand x\^\^3 to x\^{3}. However now the problem I have is with the set snippet. I would like that the set snippet follows the default behavior because when I type \\subset the snippet is triggered when I type "set". Is there any way to tell yasnippet to expand the first snippet always and the second one on word boundaries?

I'm not a yansnippet expert. But as I understand, the lisp function could be embedded inside the snippet. Like, # -*- coding: utf-8; mode: snippet -*- # name: console.log which function with var list from `kill-ring' # key: lwf # contributor: somebody # -- `(my-whatever-snippet-function)` You can write any code in `my-whatever-snippet-function`

In which snippet should I introduce this code? Are you talking about '(yas-longest-key-from-whitespace "w\_.()" "w\_." "w\_" "w")? Like for example copying that in the beginning of the tdp snippet? Sorry I'm kind of a beginner in this.

second snippet. you can check word boundary in `my-whatever-snippet-function` which is just a function defined in `~/.emacs.d/init.el`. You could use builtin api like `insert`, `forward-char`, `backward-char`, `thing-at-point`, `save-excursion`, etc.

I don't know if this would help because I need to apply a function to determine if the snippet should be expanded or not. A function in the snippet body would run after the snippet triggered.

If you mean the `condition directive`, you can still use elisp function, like # -*- coding: utf-8; mode: snippet -*- # name: console.log(description,object) # key: l1 # condition: (my-test) # contributor: Chen Bin <chenbin DOT sh AT gmail> # -- console.log('${1:object}=', ${1:$(yas/substr yas-text "[=:, ]*\\\\([^=:, ]*\\\\)" 1)}); `my-test` is just a function defined in `~/.emacs.d/init.el` by you. You can also customize `yas-buffer-local-condition ` to set up condition per buffer. See https://joaotavora.github.io/yasnippet/snippet-development.html#org185b594 for documentation.

I couldn't figure it out but thanks! I'll check the link you suggested