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.
160 lines • 25.9 kB
JavaScript
import { regexes } from '../../../constants/regexes';
import { matchAll } from '../../../services/utils/utils';
/**
* A text parser to load components with their bindings like in Angular templates.
*/
export class TextSelectorHookParser {
constructor(config, configResolver, tagHookFinder, bindingsValueManager) {
this.configResolver = configResolver;
this.tagHookFinder = tagHookFinder;
this.bindingsValueManager = bindingsValueManager;
this.savedBindings = {};
this.config = this.configResolver.processConfig(config);
this.name = this.config.name;
}
findHooks(content, context, options) {
let hookPositions = this.config.enclosing ?
this.tagHookFinder.findEnclosingTags(content, this.config.selector, this.config.bracketStyle, options) :
this.tagHookFinder.findSingleTags(content, this.config.selector, this.config.bracketStyle, options);
if (this.config.allowSelfClosing) {
hookPositions = [
...hookPositions,
...this.tagHookFinder.findSelfClosingTags(content, this.config.selector, this.config.bracketStyle, options)
];
hookPositions.sort((a, b) => a.openingTagStartIndex - b.openingTagStartIndex);
}
return hookPositions;
}
loadComponent(hookId, hookValue, context, childNodes, options) {
return {
component: this.config.component,
hostElementTag: this.config.hostElementTag || this.config.selector, // If no hostElementTag specified, use selector (which in the case of TextSelectorHookParser is only allowed to be tag name)
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
if (hookBindings === undefined) {
hookBindings = this.createBindings(hookValue.openingTag);
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
// --------------------------------------------------------------------------
/**
* Returns RichBindingData for Angular-style inputs & output attrs from an openingTag
*
* @param openingTag - The openingTag to inspect
*/
createBindings(openingTag) {
const rawInputs = this.collectRawInputs(openingTag);
const inputBindings = {};
for (const [rawInputKey, rawInputValue] of Object.entries(rawInputs)) {
inputBindings[rawInputKey] = { raw: rawInputValue, parsed: false, value: null, boundContextVariables: {} };
}
const rawOutputs = this.collectRawOutputs(openingTag);
const outputBindings = {};
for (const [rawOutputKey, rawOutputValue] of Object.entries(rawOutputs)) {
outputBindings[rawOutputKey] = { raw: rawOutputValue, parsed: false, value: null, boundContextVariables: {} };
}
return {
inputs: inputBindings,
outputs: outputBindings
};
}
/**
* Collects Angular-style inputs from an openingTag
*
* @param openingTag - The openingTag to inspect
*/
collectRawInputs(openingTag) {
const rawNoBracketInputs = this.getBindingsFromOpeningTag(openingTag, 'noBracketInputs', this.config.inputsBlacklist || null, this.config.inputsWhitelist || null);
const rawBracketInputs = this.getBindingsFromOpeningTag(openingTag, 'bracketInputs', this.config.inputsBlacklist || null, this.config.inputsWhitelist || null);
// NoBracketInputs are to be interpreted as plain strings, so wrap them in quotes
for (const [noBracketInputName, noBracketInputValue] of Object.entries(rawNoBracketInputs)) {
rawNoBracketInputs[noBracketInputName] = "'" + noBracketInputValue + "'";
}
// Merge both input objects
return { ...rawNoBracketInputs, ...rawBracketInputs };
}
/**
* Collects Angular-style outputs from an openingTag
*
* @param openingTag - The openingTag to inspect
*/
collectRawOutputs(openingTag) {
return this.getBindingsFromOpeningTag(openingTag, 'outputs', this.config.outputsBlacklist || null, this.config.outputsWhitelist || null);
}
/**
* Collects Angular-style inputs or outputs from an openingTag
*
* @param type - What kind of bindings to extract
* @param openingTag - The opening tag to inspect
* @param blacklist - A list of inputs/outputs to blacklist
* @param whitelist - A list of inputs/outputs to whitelist
*/
getBindingsFromOpeningTag(openingTag, type, blacklist, whitelist) {
const bindings = {};
// Examples: https://regex101.com/r/17x3cc/16
const attributeValuesOR = '(?:' + regexes.attributeValueDoubleQuotesRegex + '|' + regexes.attributeValueSingleQuotesRegex + ')';
let attributeNameRegex;
switch (type) {
case 'noBracketInputs':
attributeNameRegex = regexes.attributeNameNoBracketsRegex;
break;
case 'bracketInputs':
attributeNameRegex = regexes.attributeNameBracketsRegex;
break;
case 'outputs':
attributeNameRegex = regexes.attributeNameRoundBracketsRegex;
break;
}
const attributeRegex = attributeNameRegex + '\=' + attributeValuesOR;
const attributePattern = new RegExp(attributeRegex, 'gim');
const attributeMatches = matchAll(openingTag, attributePattern);
// Collect raw bindings
for (const match of attributeMatches) {
// Could be either of the attribute value capturing groups
let rawBindingValue = match[2] || match[3];
// If value is empty (someInput=""), it will return undefined for it. When using noBracketInputs, return empty string instead.
if (rawBindingValue === undefined && type === 'noBracketInputs') {
rawBindingValue = '';
}
bindings[match[1]] = rawBindingValue;
}
// 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, HookPosition, HookValue, HookComponentData, HookBindings } from '../../../interfacesPublic';\nimport { TagHookFinder } from './tagHookFinder';\nimport { BindingsValueManager } from '../bindingsValueManager';\nimport { SelectorHookParserConfig } from '../selectorHookParserConfig';\nimport { SelectorHookParserConfigResolver } from '../selectorHookParserConfigResolver';\nimport { regexes } from '../../../constants/regexes';\nimport { matchAll } from '../../../services/utils/utils';\nimport { ParseOptions } from '../../../services/settings/options';\n\n/**\n * A text parser to load components with their bindings like in Angular templates.\n */\nexport class TextSelectorHookParser implements HookParser {\n  name: string|undefined;\n  config: SelectorHookParserConfig;\n  savedBindings: {[key: number]: SavedBindings} = {};\n\n  constructor(config: SelectorHookParserConfig, private configResolver: SelectorHookParserConfigResolver, private tagHookFinder: TagHookFinder, private bindingsValueManager: BindingsValueManager) {\n    this.config = this.configResolver.processConfig(config);\n    this.name = this.config.name;\n  }\n\n  public findHooks(content: string, context: any, options: ParseOptions): HookPosition[] {\n    let hookPositions = this.config.enclosing ?\n      this.tagHookFinder.findEnclosingTags(content, this.config.selector!, this.config.bracketStyle, options) :\n      this.tagHookFinder.findSingleTags(content, this.config.selector!, this.config.bracketStyle, options);\n\n    if (this.config.allowSelfClosing) {\n      hookPositions = [\n        ...hookPositions, \n        ...this.tagHookFinder.findSelfClosingTags(content, this.config.selector!, this.config.bracketStyle, options)\n      ];\n      hookPositions.sort((a, b) => a.openingTagStartIndex - b.openingTagStartIndex);\n    }\n    \n    return hookPositions;\n  }\n\n  public loadComponent(hookId: number, hookValue: HookValue, context: any, childNodes: any[], options: ParseOptions): HookComponentData {\n    return {\n      component: this.config.component,\n      hostElementTag: this.config.hostElementTag || this.config.selector, // If no hostElementTag specified, use selector (which in the case of TextSelectorHookParser is only allowed to be tag name)\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\n    if (hookBindings === undefined) {\n      hookBindings = this.createBindings(hookValue.openingTag!);\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   * Returns RichBindingData for Angular-style inputs & output attrs from an openingTag\n   * \n   * @param openingTag - The openingTag to inspect\n   */\n  createBindings(openingTag: string): SavedBindings {\n    const rawInputs = this.collectRawInputs(openingTag!);\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.collectRawOutputs(openingTag!);\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   * Collects Angular-style inputs from an openingTag\n   *\n   * @param openingTag - The openingTag to inspect\n   */\n  collectRawInputs (openingTag: string): {[key: string]: any} {\n    const rawNoBracketInputs = this.getBindingsFromOpeningTag(openingTag, 'noBracketInputs', this.config.inputsBlacklist || null, this.config.inputsWhitelist || null);\n    const rawBracketInputs = this.getBindingsFromOpeningTag(openingTag, 'bracketInputs', this.config.inputsBlacklist || null, this.config.inputsWhitelist || null);\n\n    // NoBracketInputs are to be interpreted as plain strings, so wrap them in quotes\n    for (const [noBracketInputName, noBracketInputValue] of Object.entries(rawNoBracketInputs)) {\n      rawNoBracketInputs[noBracketInputName] = \"'\" + noBracketInputValue + \"'\";\n    }\n\n    // Merge both input objects\n    return {...rawNoBracketInputs, ...rawBracketInputs};\n  }\n\n  /**\n   * Collects Angular-style outputs from an openingTag\n   *\n   * @param openingTag - The openingTag to inspect\n   */\n  collectRawOutputs(openingTag: string): {[key: string]: any} {\n    return this.getBindingsFromOpeningTag(openingTag!, 'outputs', this.config.outputsBlacklist || null, this.config.outputsWhitelist || null);\n  }\n\n  /**\n   * Collects Angular-style inputs or outputs from an openingTag\n   *\n   * @param type - What kind of bindings to extract\n   * @param openingTag - The opening tag to inspect\n   * @param blacklist - A list of inputs/outputs to blacklist\n   * @param whitelist - A list of inputs/outputs to whitelist\n   */\n    private getBindingsFromOpeningTag(openingTag: string, type: 'noBracketInputs'|'bracketInputs'|'outputs', blacklist: string[]|null, whitelist: string[]|null): {[key: string]: any} {\n      const bindings: {[key: string]: any} = {};\n  \n      // Examples: https://regex101.com/r/17x3cc/16\n      const attributeValuesOR = '(?:' + regexes.attributeValueDoubleQuotesRegex + '|' + regexes.attributeValueSingleQuotesRegex + ')';\n      let attributeNameRegex;\n      switch (type) {\n        case 'noBracketInputs': attributeNameRegex = regexes.attributeNameNoBracketsRegex; break;\n        case 'bracketInputs': attributeNameRegex = regexes.attributeNameBracketsRegex; break;\n        case 'outputs': attributeNameRegex = regexes.attributeNameRoundBracketsRegex; break;\n      }\n      const attributeRegex = attributeNameRegex + '\\=' + attributeValuesOR;\n      const attributePattern = new RegExp(attributeRegex, 'gim');\n      const attributeMatches = matchAll(openingTag, attributePattern);\n  \n      // Collect raw bindings\n      for (const match of attributeMatches) {\n        // Could be either of the attribute value capturing groups\n        let rawBindingValue = match[2] || match[3];\n        // If value is empty (someInput=\"\"), it will return undefined for it. When using noBracketInputs, return empty string instead.\n        if (rawBindingValue === undefined && type === 'noBracketInputs') {\n          rawBindingValue = '';\n        }\n        bindings[match[1]] = rawBindingValue;\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"]}