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Track extenders by complex selector.

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This allows us to share more logic if selector lists overlap.
This commit is contained in:
Natalie Weizenbaum 2017-02-17 17:16:23 -08:00 committed by Natalie Weizenbaum
parent 4173ffc901
commit fe286487bd
1 changed files with 66 additions and 67 deletions
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133
lib/src/extend/extender.dart
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@ -23,7 +23,7 @@ class Extender {
/// A map from all extended simple selectors to the sources of those /// A map from all extended simple selectors to the sources of those
/// extensions. /// extensions.
final _extensions = <SimpleSelector, Map<SelectorList, ExtendState>>{}; final _extensions = <SimpleSelector, Map<ComplexSelector, ExtendState>>{};
/// An expando from [CssStyleRule] to media query contexts. /// An expando from [CssStyleRule] to media query contexts.
/// ///
@ -55,24 +55,22 @@ class Extender {
/// This works as though `source {@extend target}` were written in /// This works as though `source {@extend target}` were written in
/// the stylesheet. /// the stylesheet.
static SelectorList extend( static SelectorList extend(
SelectorList selector, SelectorList source, SimpleSelector target) => SelectorList selector, SelectorList source, SimpleSelector target) {
new Extender()._extendList( var extenders = new Map<ComplexSelector, ExtendState>.fromIterable(
selector, source.components,
{ value: (_) => new ExtendState.oneOff());
target: {source: new ExtendState.oneOff()} return new Extender()._extendList(selector, {target: extenders}, null);
}, }
null);
/// Returns a copy of [selector] with [source] replaced by [target]. /// Returns a copy of [selector] with [source] replaced by [target].
static SelectorList replace( static SelectorList replace(
SelectorList selector, SelectorList source, SimpleSelector target) => SelectorList selector, SelectorList source, SimpleSelector target) {
new Extender()._extendList( var extenders = new Map<ComplexSelector, ExtendState>.fromIterable(
selector, source.components,
{ value: (_) => new ExtendState.oneOff());
target: {source: new ExtendState.oneOff()} return new Extender()
}, ._extendList(selector, {target: extenders}, null, replace: true);
null, }
replace: true);
/// Adds [selector] to this extender, associated with [span]. /// Adds [selector] to this extender, associated with [span].
/// ///
@ -137,22 +135,25 @@ class Extender {
void addExtension( void addExtension(
SelectorList extender, SimpleSelector target, ExtendRule extend, SelectorList extender, SimpleSelector target, ExtendRule extend,
[List<CssMediaQuery> mediaContext]) { [List<CssMediaQuery> mediaContext]) {
var rules = _selectors[target];
Map<ComplexSelector, ExtendState> newExtenders;
var sources = _extensions.putIfAbsent(target, () => {}); var sources = _extensions.putIfAbsent(target, () => {});
var existingState = sources[extender];
if (existingState != null) {
// If there's already an extend from [extender] to [target], we don't need
// to re-run the extension. We may need to mark the extension as
// mandatory, though.
existingState.addSource(extend.span, mediaContext,
optional: extend.isOptional);
return;
}
var state =
new ExtendState(extend.span, mediaContext, optional: extend.isOptional);
sources[extender] = state;
for (var complex in extender.components) { for (var complex in extender.components) {
var existingState = sources[complex];
if (existingState != null) {
// If there's already an extend from [extender] to [target], we don't need
// to re-run the extension. We may need to mark the extension as
// mandatory, though.
existingState.addSource(extend.span, mediaContext,
optional: extend.isOptional);
continue;
}
var state = new ExtendState(extend.span, mediaContext,
optional: extend.isOptional);
sources[complex] = state;
for (var component in complex.components) { for (var component in complex.components) {
if (component is CompoundSelector) { if (component is CompoundSelector) {
for (var simple in component.components) { for (var simple in component.components) {
@ -160,17 +161,19 @@ class Extender {
} }
} }
} }
if (rules != null) {
newExtenders ??= {};
newExtenders[complex] = state;
}
} }
var rules = _selectors[target];
if (rules == null) return; if (rules == null) return;
var extensions = { if (newExtenders == null) return;
target: {extender: state}
};
for (var rule in rules) { for (var rule in rules) {
try { try {
rule.selector.value = rule.selector.value = _extendList(
_extendList(rule.selector.value, extensions, _mediaContexts[rule]); rule.selector.value, {target: newExtenders}, _mediaContexts[rule]);
} on SassException catch (error) { } on SassException catch (error) {
throw new SassException( throw new SassException(
"From ${rule.selector.span.message('')}\n" "From ${rule.selector.span.message('')}\n"
@ -201,7 +204,7 @@ class Extender {
/// If [replace] is `true`, this doesn't preserve the original selectors. /// If [replace] is `true`, this doesn't preserve the original selectors.
SelectorList _extendList( SelectorList _extendList(
SelectorList list, SelectorList list,
Map<SimpleSelector, Map<SelectorList, ExtendState>> extensions, Map<SimpleSelector, Map<ComplexSelector, ExtendState>> extensions,
List<CssMediaQuery> mediaQueryContext, List<CssMediaQuery> mediaQueryContext,
{bool replace: false}) { {bool replace: false}) {
// This could be written more simply using [List.map], but we want to avoid // This could be written more simply using [List.map], but we want to avoid
@ -230,7 +233,7 @@ class Extender {
/// If [replace] is `true`, this doesn't preserve the original selectors. /// If [replace] is `true`, this doesn't preserve the original selectors.
List<List<ComplexSelector>> _extendComplex( List<List<ComplexSelector>> _extendComplex(
ComplexSelector complex, ComplexSelector complex,
Map<SimpleSelector, Map<SelectorList, ExtendState>> extensions, Map<SimpleSelector, Map<ComplexSelector, ExtendState>> extensions,
List<CssMediaQuery> mediaQueryContext, List<CssMediaQuery> mediaQueryContext,
{bool replace: false}) { {bool replace: false}) {
// This could be written more simply using [List.map], but we want to avoid // This could be written more simply using [List.map], but we want to avoid
@ -290,7 +293,7 @@ class Extender {
/// If [replace] is `true`, this doesn't preserve the original selectors. /// If [replace] is `true`, this doesn't preserve the original selectors.
List<ComplexSelector> _extendCompound( List<ComplexSelector> _extendCompound(
CompoundSelector compound, CompoundSelector compound,
Map<SimpleSelector, Map<SelectorList, ExtendState>> extensions, Map<SimpleSelector, Map<ComplexSelector, ExtendState>> extensions,
List<CssMediaQuery> mediaQueryContext, List<CssMediaQuery> mediaQueryContext,
{bool replace: false}) { {bool replace: false}) {
var original = compound; var original = compound;
@ -312,35 +315,31 @@ class Extender {
compoundWithoutSimple.setRange(0, i, compound.components); compoundWithoutSimple.setRange(0, i, compound.components);
compoundWithoutSimple.setRange( compoundWithoutSimple.setRange(
i, compound.components.length - 1, compound.components, i + 1); i, compound.components.length - 1, compound.components, i + 1);
sources.forEach((extender, state) { sources.forEach((complex, state) {
for (var complex in extender.components) { var extenderBase = complex.components.last as CompoundSelector;
var extenderBase = complex.components.last as CompoundSelector; var unified = compoundWithoutSimple.isEmpty
var unified = compoundWithoutSimple.isEmpty ? extenderBase
? extenderBase : unifyCompound(extenderBase.components, compoundWithoutSimple);
: unifyCompound(extenderBase.components, compoundWithoutSimple); if (unified == null) return;
if (unified == null) continue;
state.assertCompatibleMediaContext(mediaQueryContext); state.assertCompatibleMediaContext(mediaQueryContext);
extended ??= replace extended ??= replace
? [] ? []
: [ : [
new ComplexSelector([compound]) new ComplexSelector([compound])
]; ];
var newComplex = new ComplexSelector( var newComplex = new ComplexSelector(
complex.components complex.components
.sublist(0, complex.components.length - 1) .sublist(0, complex.components.length - 1)
.toList() .toList()
..add(unified), ..add(unified),
lineBreak: complex.lineBreak); lineBreak: complex.lineBreak);
_addSourceSpecificity( _addSourceSpecificity(newComplex,
newComplex, math.max(_sourceSpecificityFor(compound), complex.maxSpecificity));
math.max( extended.add(newComplex);
_sourceSpecificityFor(compound), complex.maxSpecificity)); state.isUsed = true;
extended.add(newComplex);
state.isUsed = true;
}
}); });
} }
@ -370,7 +369,7 @@ class Extender {
CompoundSelector compound, CompoundSelector compound,
int i, int i,
SimpleSelector simple, SimpleSelector simple,
Map<SimpleSelector, Map<SelectorList, ExtendState>> extensions, Map<SimpleSelector, Map<ComplexSelector, ExtendState>> extensions,
List<CssMediaQuery> mediaQueryContext, List<CssMediaQuery> mediaQueryContext,
{bool replace: false}) { {bool replace: false}) {
if (simple is PseudoSelector && simple.selector != null) { if (simple is PseudoSelector && simple.selector != null) {
@ -397,7 +396,7 @@ class Extender {
/// If [replace] is `true`, this doesn't preserve the original selectors. /// If [replace] is `true`, this doesn't preserve the original selectors.
List<PseudoSelector> _extendPseudo( List<PseudoSelector> _extendPseudo(
PseudoSelector pseudo, PseudoSelector pseudo,
Map<SimpleSelector, Map<SelectorList, ExtendState>> extensions, Map<SimpleSelector, Map<ComplexSelector, ExtendState>> extensions,
List<CssMediaQuery> mediaQueryContext, List<CssMediaQuery> mediaQueryContext,
{bool replace: false}) { {bool replace: false}) {
var extended = _extendList(pseudo.selector, extensions, mediaQueryContext, var extended = _extendList(pseudo.selector, extensions, mediaQueryContext,