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style: Implement a version of #[css(skip_if)] that takes more context.

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I called it contextual_skip_if, though better names welcome.

Differential Revision: https://phabricator.services.mozilla.com/D21858
This commit is contained in:
Emilio Cobos Álvarez 2019-03-03 11:31:06 +00:00
parent 94686df11b
commit 35b8b95263
2 changed files with 24 additions and 2 deletions
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4
components/style_traits/values.rs
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@ -37,6 +37,10 @@ use std::fmt::{self, Write};
/// * if `#[css(skip_if = "function")]` is found on a field, the `ToCss` call
/// for that field is skipped if `function` returns true. This function is
/// provided the field as an argument;
/// * if `#[css(contextual_skip_if = "function")]` is found on a field, the
/// `ToCss` call for that field is skipped if `function` returns true. This
/// function is given all the fields in the current struct or variant as an
/// argument;
/// * `#[css(represents_keyword)]` can be used on bool fields in order to
/// serialize the field name if the field is true, or nothing otherwise. It
/// also collects those keywords for `SpecifiedValueInfo`.