vim syntax - How to highlight a match inside a region

Question

I'm writing a vim syntax highlighting script to determine if a global param is in uppercase only. If its not - I want to highlight it. The problem is that the global params is in a specific part in the page.

The code looks something like this:

***VARS***
${VAR1}
${var2}

***OTHERS***
${var3}

So I want that all the variables under VARS which contains lowercase to be highlighted - in my example, only ${var2} should be highlighted.

I tried to do this:

syn match global_var_match "\${.*[a-z][^}]+}" contained
syn region global_variables start="\(\*\*\*VARS\*\*\*\)\@<=" end="\(\*\*\* OTHERS\*\*\*\)\@=" contains=global_var_match 
hi link global_variables ErrorMsg

But then also ${VAR1} and ${var2} is highlighted.

Note that \${.*[a-z][^}]+} should probably be \${[^}]*[a-z][^}]*}. The .* will match the closing }; and what if the lower-case character is just before the closing }? — Kaz
– Kaz, Commented Jul 15, 2019 at 21:50

Kaz · Accepted Answer · 2019-07-15 22:04:06Z

1

One problem is the simple typo in:

hi link global_variables ErrorMsg

This should be

hi link global_var_match ErrorMsg

I.e. the bad match, not the containing region. However, with this change, variables containing lower case are still matched under ***OTHERS***.

That issue is caused by a spurious space you have in your match for ***OTHERS***.

I also chhanged your global_var_match regex. I have it as:

syn match global_var_match "\${[^}]*[a-z][^}]*}" contained

This behaves very well for me in test cases like

${VAR} blah ${VAr} ${vAR}

and others: only the vars containing lower case are flagged. Still investigating why the region is incorrect.

Here is what I have:

syn match global_var_match "\${[^}]*[a-z][^}]*}" contained
syn region global_variables start="\(\*\*\*VARS\*\*\*\)\@<=" end="\(\*\*\*OTHERS
\*\*\*\)\@=" contains=global_var_match
hi link global_var_match ErrorMsg

edited Jul 15, 2019 at 22:04

answered Jul 15, 2019 at 21:54

Kaz

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