ngx-dynamic-hooks
Version:
Automatically insert live Angular components into a dynamic string of content (based on their selector or any pattern of your choice) and render the result in the DOM.
133 lines • 22 kB
JavaScript
/**
* An element parser to load components with their bindings like in Angular templates.
*/
export class ElementSelectorHookParser {
constructor(config, configResolver, platformService, bindingsValueManager) {
this.configResolver = configResolver;
this.platformService = platformService;
this.bindingsValueManager = bindingsValueManager;
this.savedBindings = {};
this.config = this.configResolver.processConfig(config);
this.name = this.config.name;
}
findHookElements(contentElement, context, options) {
return Array.from(this.platformService.querySelectorAll(contentElement, this.config.selector));
}
loadComponent(hookId, hookValue, context, childNodes, options) {
// Always scrub potential []-input- and ()-output-attrs from anchor elements
this.scrubAngularBindingAttrs(hookValue.element);
return {
component: this.config.component,
hostElementTag: this.config.hostElementTag,
injector: this.config.injector,
environmentInjector: this.config.environmentInjector
};
}
getBindings(hookId, hookValue, context, options) {
let hookBindings = this.savedBindings[hookId];
// Parse bindings once from hookValue, then reuse on subsequent runs (raw values will never change as hookValue.element is a snapshot)
if (hookBindings === undefined) {
hookBindings = this.createBindings(hookValue.elementSnapshot);
this.savedBindings[hookId] = hookBindings;
}
// (Re)evaluate if needed
this.bindingsValueManager.checkInputBindings(hookBindings.inputs, context, this.config, options);
this.bindingsValueManager.checkOutputBindings(hookBindings.outputs, this.config, options);
return {
inputs: this.getValuesFromSavedBindings(hookBindings.inputs),
outputs: this.getValuesFromSavedBindings(hookBindings.outputs)
};
}
// Bindings
// --------------------------------------------------------------------------
/**
* Always removes angular-typical template attrs like []-input and ()-outputs from anchors
*
* @param anchorElement - The element to strub
*/
scrubAngularBindingAttrs(anchorElement) {
const attrsToScrub = Array.from(anchorElement.attributes)
.map((attrObj) => attrObj.name)
.filter((attr) => (attr.startsWith('[') && attr.endsWith(']')) ||
(attr.startsWith('(') && attr.endsWith(')')));
for (const attr of attrsToScrub) {
this.platformService.removeAttribute(anchorElement, attr);
}
}
/**
* Returns RichBindingData for Angular-style inputs & output attrs from an element
*
* @param element - The element to inspect
*/
createBindings(element) {
const rawInputs = this.collectRawBindings(element, 'inputs', this.config.inputsBlacklist || null, this.config.inputsWhitelist || null);
const inputBindings = {};
for (const [rawInputKey, rawInputValue] of Object.entries(rawInputs)) {
inputBindings[rawInputKey] = { raw: rawInputValue, parsed: false, value: null, boundContextVariables: {} };
}
const rawOutputs = this.collectRawBindings(element, 'outputs', this.config.outputsBlacklist || null, this.config.outputsWhitelist || null);
const outputBindings = {};
for (const [rawOutputKey, rawOutputValue] of Object.entries(rawOutputs)) {
outputBindings[rawOutputKey] = { raw: rawOutputValue, parsed: false, value: null, boundContextVariables: {} };
}
return {
inputs: inputBindings,
outputs: outputBindings
};
}
/**
* Returns Angular-style inputs or output attrs from an element
*
* @param element - The element to inspect
* @param type - Whether to return the inputs or outputs
* @param blacklist - A list of inputs/outputs to blacklist
* @param whitelist - A list of inputs/outputs to whitelist
*/
collectRawBindings(element, type, blacklist, whitelist) {
const bindings = {};
// Collect raw bindings
const attrNames = this.platformService.getAttributeNames(element);
for (let attrName of attrNames) {
if (type === 'inputs' && (!attrName.startsWith('(') || !attrName.endsWith(')')) ||
type === 'outputs' && (attrName.startsWith('(') && attrName.endsWith(')'))) {
let binding = this.platformService.getAttribute(element, attrName);
// If input has []-brackets: Transform empty attr to undefined
if (type === 'inputs' && attrName.startsWith('[') && attrName.endsWith(']') && binding === '') {
binding = undefined;
}
// If input has no []-brackets: Should be interpreted as plain strings, so wrap in quotes
if (type === 'inputs' && (!attrName.startsWith('[') || !attrName.endsWith(']'))) {
binding = `'${binding}'`;
}
// Trim [] and () brackets from attr name
attrName = attrName.replace(/^\[|^\(|\]$|\)$/g, '');
bindings[attrName] = binding;
}
}
// Filter bindings
const filteredBindings = {};
for (const [bindingName, bindingValue] of Object.entries(bindings)) {
if (blacklist && blacklist.includes(bindingName)) {
continue;
}
if (whitelist && !whitelist.includes(bindingName)) {
continue;
}
filteredBindings[bindingName] = bindingValue;
}
return filteredBindings;
}
/**
* Transforms a RichBindingData object into a normal bindings object
*
* @param richBindingsObject - The object containing the RichBindingData
*/
getValuesFromSavedBindings(richBindingsObject) {
const result = {};
for (const [key, value] of Object.entries(richBindingsObject)) {
result[key] = value.value;
}
return result;
}
}
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{ RichBindingData, SavedBindings } from '../../../interfaces';\nimport { HookParser, HookValue, HookComponentData, HookBindings } from '../../../interfacesPublic';\nimport { BindingsValueManager } from '../bindingsValueManager';\nimport { SelectorHookParserConfig } from '../selectorHookParserConfig';\nimport { SelectorHookParserConfigResolver } from '../selectorHookParserConfigResolver';\nimport { AutoPlatformService } from '../../../services/platform/autoPlatformService';\nimport { ParseOptions } from '../../../services/settings/options';\n\n/**\n * An element parser to load components with their bindings like in Angular templates.\n */\nexport class ElementSelectorHookParser implements HookParser {\n  name: string|undefined;\n  config: SelectorHookParserConfig;\n  savedBindings: {[key: number]: SavedBindings} = {};\n\n  constructor(config: SelectorHookParserConfig, private configResolver: SelectorHookParserConfigResolver, private platformService: AutoPlatformService, private bindingsValueManager: BindingsValueManager) {\n    this.config = this.configResolver.processConfig(config);\n    this.name = this.config.name;\n  }\n\n  public findHookElements(contentElement: any, context: any, options: ParseOptions): any[] {\n    return Array.from(this.platformService.querySelectorAll(contentElement, this.config.selector!));\n  }\n\n  public loadComponent(hookId: number, hookValue: HookValue, context: any, childNodes: any[], options: ParseOptions): HookComponentData {\n\n    // Always scrub potential []-input- and ()-output-attrs from anchor elements \n    this.scrubAngularBindingAttrs(hookValue.element);\n\n    return {\n      component: this.config.component,\n      hostElementTag: this.config.hostElementTag,\n      injector: this.config.injector,\n      environmentInjector: this.config.environmentInjector\n    };\n  }\n\n  public getBindings(hookId: number, hookValue: HookValue, context: any, options: ParseOptions): HookBindings {\n    let hookBindings = this.savedBindings[hookId];\n\n    // Parse bindings once from hookValue, then reuse on subsequent runs (raw values will never change as hookValue.element is a snapshot)\n    if (hookBindings === undefined) {\n      hookBindings = this.createBindings(hookValue.elementSnapshot!);\n      this.savedBindings[hookId] = hookBindings;\n    }\n\n    // (Re)evaluate if needed\n    this.bindingsValueManager.checkInputBindings(hookBindings.inputs!, context, this.config, options);\n    this.bindingsValueManager.checkOutputBindings(hookBindings.outputs!, this.config, options);\n\n    return {\n      inputs: this.getValuesFromSavedBindings(hookBindings.inputs!),\n      outputs: this.getValuesFromSavedBindings(hookBindings.outputs!)\n    };\n  }\n\n  // Bindings\n  // --------------------------------------------------------------------------\n\n  /**\n   * Always removes angular-typical template attrs like []-input and ()-outputs from anchors\n   *\n   * @param anchorElement - The element to strub\n   */\n  scrubAngularBindingAttrs(anchorElement: any) {\n    const attrsToScrub = Array.from(anchorElement.attributes)\n      .map((attrObj: any) => attrObj.name)\n      .filter((attr: string) => \n        (attr.startsWith('[') && attr.endsWith(']')) ||\n        (attr.startsWith('(') && attr.endsWith(')'))\n      );\n\n    for (const attr of attrsToScrub) {\n      this.platformService.removeAttribute(anchorElement, attr);\n    }\n  }\n\n  /**\n   * Returns RichBindingData for Angular-style inputs & output attrs from an element\n   * \n   * @param element - The element to inspect\n   */\n  createBindings(element: any): SavedBindings {\n    const rawInputs = this.collectRawBindings(element!, 'inputs', this.config.inputsBlacklist || null, this.config.inputsWhitelist || null);\n    const inputBindings: {[key: string]: RichBindingData} = {};\n    for (const [rawInputKey, rawInputValue] of Object.entries(rawInputs)) {\n      inputBindings[rawInputKey] = {raw: rawInputValue, parsed: false, value: null, boundContextVariables: {}};\n    }\n\n    const rawOutputs = this.collectRawBindings(element!, 'outputs', this.config.outputsBlacklist || null, this.config.outputsWhitelist || null);\n    const outputBindings: {[key: string]: RichBindingData} = {};\n    for (const [rawOutputKey, rawOutputValue] of Object.entries(rawOutputs)) {\n      outputBindings[rawOutputKey] = {raw: rawOutputValue, parsed: false, value: null, boundContextVariables: {}};\n    }\n\n    return {\n      inputs: inputBindings,\n      outputs: outputBindings\n    };\n  }\n\n  /**\n   * Returns Angular-style inputs or output attrs from an element\n   * \n   * @param element - The element to inspect\n   * @param type - Whether to return the inputs or outputs\n   * @param blacklist - A list of inputs/outputs to blacklist\n   * @param whitelist - A list of inputs/outputs to whitelist\n   */\n  collectRawBindings (element: any, type: 'inputs'|'outputs', blacklist: string[]|null, whitelist: string[]|null): {[key: string]: any} {\n    const bindings: {[key: string]: any} = {};\n\n    // Collect raw bindings\n    const attrNames = this.platformService.getAttributeNames(element);\n    for (let attrName of attrNames) {\n      if (\n        type === 'inputs' && (!attrName.startsWith('(') || !attrName.endsWith(')')) ||\n        type === 'outputs' && (attrName.startsWith('(') && attrName.endsWith(')'))\n      ) {\n        let binding: any = this.platformService.getAttribute(element, attrName);\n\n        // If input has []-brackets: Transform empty attr to undefined\n        if (type === 'inputs' && attrName.startsWith('[') && attrName.endsWith(']') && binding === '') {\n          binding = undefined;\n        }\n\n        // If input has no []-brackets: Should be interpreted as plain strings, so wrap in quotes\n        if (type === 'inputs' && (!attrName.startsWith('[') || !attrName.endsWith(']'))) {\n          binding = `'${binding}'`;\n        }\n\n        // Trim [] and () brackets from attr name\n        attrName = attrName.replace(/^\\[|^\\(|\\]$|\\)$/g, '');\n\n        bindings[attrName] = binding;\n      }\n    }\n    \n    // Filter bindings\n    const filteredBindings: {[key: string]: any} = {};\n    for (const [bindingName, bindingValue] of Object.entries(bindings)) {\n      if (blacklist && blacklist.includes(bindingName)) {\n        continue;\n      }\n      if (whitelist && !whitelist.includes(bindingName)) {\n        continue;\n      }\n      filteredBindings[bindingName] = bindingValue;\n    }\n\n    return filteredBindings;\n  }\n\n  /**\n   * Transforms a RichBindingData object into a normal bindings object\n   *\n   * @param richBindingsObject - The object containing the RichBindingData\n   */\n  private getValuesFromSavedBindings(richBindingsObject: {[key: string]: RichBindingData}): {[key: string]: any} {\n    const result: {[key: string]: any} = {};\n    for (const [key, value] of Object.entries(richBindingsObject)) {\n      result[key] = value.value;\n    }\n    return result;\n  }\n}\n"]}