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Factor out _maybeExtendPseudo from _extendCompound.

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Natalie Weizenbaum 2017-02-17 14:17:43 -08:00 committed by Natalie Weizenbaum
parent 454171d7a0
commit 4173ffc901
1 changed files with 34 additions and 14 deletions
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48
lib/src/extend/extender.dart
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@ -299,20 +299,10 @@ class Extender {
for (var i = 0; i < compound.components.length; i++) { for (var i = 0; i < compound.components.length; i++) {
var simple = compound.components[i]; var simple = compound.components[i];
var extendedPseudo = simple is PseudoSelector && simple.selector != null original = _maybeExtendPseudo(
? _extendPseudo(simple, extensions, mediaQueryContext, compound, i, simple, extensions, mediaQueryContext,
replace: replace) replace: replace) ??
: null; original;
if (extendedPseudo != null) {
var simples = new List<SimpleSelector>(
compound.components.length - 1 + extendedPseudo.length);
simples.setRange(0, i, compound.components);
simples.setRange(i, i + extendedPseudo.length, extendedPseudo);
simples.setRange(i + extendedPseudo.length, simples.length,
compound.components, i + 1);
original = new CompoundSelector(simples);
}
var sources = extensions[simple]; var sources = extensions[simple];
if (sources == null) continue; if (sources == null) continue;
@ -371,6 +361,36 @@ class Extender {
return extended; return extended;
} }
/// If [simple] is a selector pseudoclass, extends its contents and returns a
/// copy of [compound] with the results injected instead of the simple
/// selector at [i] (assumed to be [simple]).
///
/// If the extension doesn't happen for any reason, returns `null` instead.
CompoundSelector _maybeExtendPseudo(
CompoundSelector compound,
int i,
SimpleSelector simple,
Map<SimpleSelector, Map<SelectorList, ExtendState>> extensions,
List<CssMediaQuery> mediaQueryContext,
{bool replace: false}) {
if (simple is PseudoSelector && simple.selector != null) {
var extendedPseudo = _extendPseudo(simple, extensions, mediaQueryContext,
replace: replace);
if (extendedPseudo == null) return null;
assert(identical(compound.components[i], simple));
var simples = new List<SimpleSelector>(
compound.components.length - 1 + extendedPseudo.length);
simples.setRange(0, i, compound.components);
simples.setRange(i, i + extendedPseudo.length, extendedPseudo);
simples.setRange(i + extendedPseudo.length, simples.length,
compound.components, i + 1);
return new CompoundSelector(simples);
} else {
return null;
}
}
/// Extends [pseudo] using [extensions], and returns a list of resulting /// Extends [pseudo] using [extensions], and returns a list of resulting
/// pseudo selectors. /// pseudo selectors.
/// ///