[css-values-4] Clarify minimum calculation terms

[cdoublev]

UAs must support calculations of at least 32 <calc-value> terms and at least 32 levels of nesting (parentheses and/or functions)

Considering the above requirement, does calc(calc(1 + 2) + calc(1)) include 2, 3, or 5 <calc-value>s?

I would be fine with closing this issue as "question answered" with 32 <calc-value> terms without considering nesting, because that is what it means to me in the absence of any other precision. It would mean that there is 5 terms in my example.

[cdoublev]

I re-open this issue because I think the current definition is inapplicable: if you have to support 32 levels of nesting, you have to support 33 <calc-value> terms.

(1) matches two <calc-value>: the first for the parens, the second for 1.

[Loirooriol]

Note those are minimums, not maximums.

[cdoublev]

The title of this issue was incorrect, indeed.

But I wonder if it should be a maximum, actually. Chrome and Firefox do not limit terms and my laptop froze for 5 minutes when I tested this limit (doh) minimum in both browsers at the same time..

[Loirooriol]

How many terms did your test have? Maybe file issues in https://crbug.com and https://bugzil.la so that they add implementation limits. But I don't think the spec should impose maximums.

[cdoublev]

I think it was a 6 or 7 digits number but I think it depends on the device resources.

You are probably right: the limit should be defined on the browser side. It seems that I cannot write anything good for today, and I am not thrilled with the idea of crashing my laptop again, but I will file an issue tomorrow after carefull testing.

[tabatkins]

While parsing calc(calc(1 + 2) + calc(1)) you match against <calc-value> 5 times - twice at the top level, and three more times nested inside the calcs. So that's the answer for the purposes of this limit. ^_^

[cdoublev]

Ok, thanks. I am fine with the current definition since it is an unimportant detail. I understand that the purpose is to avoid processing variadic math functions with each argument defined with 32*32**32 calc values.