feat(selector): initial version of the selector
This commit is contained in:
Tobias Bosch
@ -1,19 +1,232 @@
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import {Set} from 'facade/lang';
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//import {AnnotatedType} from './annotated_type';
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import {List, ListWrapper, StringMapWrapper} from 'facade/collection';
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import {RegExpWrapper, RegExpMatcherWrapper, CONST, isPresent, isBlank} from 'facade/lang';
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export class Selector {
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constructor(directives:Set<AnnotatedType>) {
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this.directives = directives;
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const _EMPTY_ATTR_VALUE = '';
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export class SelectorMatcher {
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/* TODO: Add these fields when the transpiler supports fields
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_elementMap:Map<String, List>;
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_elementPartialMap:Map<String, Selector>;
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_classMap:Map<String, List>;
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_classPartialMap:Map<String, Selector>;
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_attrValueMap:Map<String, Map<String, List>>;
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_attrValuePartialMap:Map<String, Map<String, Selector>>;
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*/
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constructor() {
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this._selectables = ListWrapper.create();
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this._elementMap = StringMapWrapper.create();
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this._elementPartialMap = StringMapWrapper.create();
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this._classMap = StringMapWrapper.create();
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this._classPartialMap = StringMapWrapper.create();
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this._attrValueMap = StringMapWrapper.create();
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this._attrValuePartialMap = StringMapWrapper.create();
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}
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/**
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* When presented with an element description it will return the current set of
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* directives which are present on the element.
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*
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* @param elementName Name of the element
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* @param attributes Attributes on the Element.
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* Add an object that can be found later on by calling `match`.
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* @param cssSelector A css selector
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* @param selectable An opaque object that will be given to the callback of the `match` function
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*/
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visitElement(elementName:string, attributes:Map<string, string>):List<AnnotatedType> {
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return null;
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addSelectable(cssSelector:CssSelector, selectable) {
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var matcher = this;
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var element = cssSelector.element;
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var classNames = cssSelector.classNames;
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var attrs = cssSelector.attrs;
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if (isPresent(element)) {
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var isTerminal = attrs.length === 0 && classNames.length === 0;
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if (isTerminal) {
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this._addTerminal(matcher._elementMap, element, selectable);
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} else {
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matcher = this._addPartial(matcher._elementPartialMap, element);
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}
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}
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if (isPresent(classNames)) {
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for (var index = 0; index<classNames.length; index++) {
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var isTerminal = attrs.length === 0 && index === classNames.length - 1;
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var className = classNames[index];
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if (isTerminal) {
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this._addTerminal(matcher._classMap, className, selectable);
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} else {
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matcher = this._addPartial(matcher._classPartialMap, className);
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}
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}
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}
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if (isPresent(attrs)) {
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for (var index = 0; index<attrs.length; index++) {
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var isTerminal = index === attrs.length - 1;
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var attr = attrs[index];
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var attrName = attr.name;
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var attrValue = isPresent(attr.value) ? attr.value : _EMPTY_ATTR_VALUE;
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var map = isTerminal ? matcher._attrValueMap : matcher._attrValuePartialMap;
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var valuesMap = StringMapWrapper.get(map, attrName)
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if (isBlank(valuesMap)) {
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valuesMap = StringMapWrapper.create();
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StringMapWrapper.set(map, attrName, valuesMap);
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}
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if (isTerminal) {
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this._addTerminal(valuesMap, attrValue, selectable);
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} else {
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matcher = this._addPartial(valuesMap, attrValue);
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}
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}
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}
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}
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// TODO: map:StringMap when we have a StringMap type...
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_addTerminal(map, name:string, selectable) {
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var terminalList = StringMapWrapper.get(map, name)
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if (isBlank(terminalList)) {
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terminalList = ListWrapper.create();
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StringMapWrapper.set(map, name, terminalList);
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}
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ListWrapper.push(terminalList, selectable);
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}
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// TODO: map:StringMap when we have a StringMap type...
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_addPartial(map, name:string) {
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var matcher = StringMapWrapper.get(map, name)
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if (isBlank(matcher)) {
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matcher = new SelectorMatcher();
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StringMapWrapper.set(map, name, matcher);
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}
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return matcher;
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}
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/**
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* Find the objects that have been added via `addSelectable`
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* whose css selector is contained in the given css selector.
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* @param cssSelector A css selector
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* @param matchedCallback This callback will be called with the object handed into `addSelectable`
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*/
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match(cssSelector:CssSelector, matchedCallback:Function) {
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var element = cssSelector.element;
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var classNames = cssSelector.classNames;
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var attrs = cssSelector.attrs;
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this._matchTerminal(this._elementMap, element, matchedCallback);
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this._matchPartial(this._elementPartialMap, element, cssSelector, matchedCallback);
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if (isPresent(classNames)) {
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for (var index = 0; index<classNames.length; index++) {
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var className = classNames[index];
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this._matchTerminal(this._classMap, className, matchedCallback);
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this._matchPartial(this._classPartialMap, className, cssSelector, matchedCallback);
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}
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}
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if (isPresent(attrs)) {
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for (var index = 0; index<attrs.length; index++) {
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var attr = attrs[index];
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var attrName = attr.name;
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var attrValue = isPresent(attr.value) ? attr.value : _EMPTY_ATTR_VALUE;
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var valuesMap = StringMapWrapper.get(this._attrValueMap, attrName)
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this._matchTerminal(valuesMap, attrValue, matchedCallback);
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valuesMap = StringMapWrapper.get(this._attrValuePartialMap, attrName)
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this._matchPartial(valuesMap, attrValue, cssSelector, matchedCallback);
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}
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}
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}
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// TODO: map:StringMap when we have a StringMap type...
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_matchTerminal(map, name, matchedCallback) {
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if (isBlank(map) || isBlank(name)) {
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return;
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}
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var selectables = StringMapWrapper.get(map, name)
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if (isBlank(selectables)) {
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return;
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}
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for (var index=0; index<selectables.length; index++) {
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matchedCallback(selectables[index]);
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}
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}
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// TODO: map:StringMap when we have a StringMap type...
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_matchPartial(map, name, cssSelector, matchedCallback) {
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if (isBlank(map) || isBlank(name)) {
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return;
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}
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var nestedSelector = StringMapWrapper.get(map, name)
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if (isBlank(nestedSelector)) {
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return;
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}
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// TODO(perf): get rid of recursion and measure again
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// TODO(perf): don't pass the whole selector into the recursion,
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// but only the not processed parts
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nestedSelector.match(cssSelector, matchedCallback);
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}
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}
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export class Attr {
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@CONST()
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constructor(name:string, value:string = null) {
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this.name = name;
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this.value = value;
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}
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}
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// TODO: Can't use `const` here as
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// in Dart this is not transpiled into `final` yet...
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var _SELECTOR_REGEXP =
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RegExpWrapper.create('^([-\\w]+)|' + // "tag"
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'(?:\\.([-\\w]+))|' + // ".class"
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'(?:\\[([-\\w*]+)(?:=([^\\]]*))?\\])'); // "[name]", "[name=value]" or "[name*=value]"
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export class CssSelector {
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static parse(selector:string):CssSelector {
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var element = null;
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var classNames = ListWrapper.create();
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var attrs = ListWrapper.create();
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selector = selector.toLowerCase();
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var matcher = RegExpWrapper.matcher(_SELECTOR_REGEXP, selector);
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var match;
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while (isPresent(match = RegExpMatcherWrapper.next(matcher))) {
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if (isPresent(match[1])) {
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element = match[1];
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}
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if (isPresent(match[2])) {
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ListWrapper.push(classNames, match[2]);
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}
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if (isPresent(match[3])) {
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ListWrapper.push(attrs, new Attr(match[3], match[4]));
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}
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}
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return new CssSelector(element, classNames, attrs);
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}
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// TODO: do a toLowerCase() for all arguments
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@CONST()
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constructor(element:string, classNames:List<string>, attrs:List<Attr>) {
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this.element = element;
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this.classNames = classNames;
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this.attrs = attrs;
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}
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toString():string {
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var res = '';
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if (isPresent(this.element)) {
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res += this.element;
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}
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if (isPresent(this.classNames)) {
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for (var i=0; i<this.classNames.length; i++) {
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res += '.' + this.classNames[i];
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}
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}
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if (isPresent(this.attrs)) {
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for (var i=0; i<this.attrs.length; i++) {
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var attr = this.attrs[i];
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res += '[' + attr.name;
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if (isPresent(attr.value)) {
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res += '=' + attr.value;
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}
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res += ']';
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}
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}
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return res;
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}
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}
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