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ngx-dynamic-hooks

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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.

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import { Injectable } from '@angular/core'; import * as i0 from "@angular/core"; import * as i1 from "../../services/utils/dataTypeParser"; import * as i2 from "../../services/utils/logger"; /** * A helper service for the SelectorHookParsers that evaluates bindings and only updates them when needed so references are retained when possible */ export class BindingsValueManager { constructor(dataTypeParser, logger) { this.dataTypeParser = dataTypeParser; this.logger = logger; } // Inputs // ------------------------------------------------------------------------------------- /** * Checks input bindings and evaluates/updates them as needed * * @param bindings - A list of @Input() bindings * @param context - The current context object * @param parserConfig - The parser config * @param options - The current ParseOptions */ checkInputBindings(bindings, context, parserConfig, options) { for (const [inputName, inputBinding] of Object.entries(bindings)) { // If no need to parse, use raw as value if (!parserConfig.parseInputs) { inputBinding.value = inputBinding.raw; } else { // If not yet parsed, do so if (!inputBinding.parsed) { try { inputBinding.value = this.dataTypeParser.evaluate(inputBinding.raw, parserConfig.allowContextInBindings ? context : {}, undefined, parserConfig.unescapeStrings, inputBinding.boundContextVariables, parserConfig.allowContextFunctionCalls, options); inputBinding.parsed = true; } catch (e) { this.logger.error([`Hook input parsing error\nselector: ` + parserConfig.selector + `\ninput: ` + inputName + `\nvalue: "` + inputBinding.value + `"`], options); this.logger.error([e.stack], options); // If binding could not be parsed at all due to syntax error, remove from list of inputs. // No amount of calls to updateInputBindings() will fix this kind of error. delete bindings[inputName]; } // Otherwise check if needs an update } else { this.updateInputBindingIfStale(inputBinding, context, parserConfig); } } } } /** * We can detect if a binding needs to be reevaluated via the bound context variables. There are three cases to consider: * * a) If a binding does not use context vars, don't reevaluate (binding is static and won't ever need to be updated) * b) If a binding does use context vars, but context vars haven't changed, don't reevaluate either (would evalute the same) * c) If a binding uses context vars and they have changed, reevaluate the binding from scratch to get the new version * * This is in line with the standard Angular behavior when evaluating template vars like [input]="{prop: this.something}". * When 'this.something' changes so that it returns false on a === comparison with its previous value, Angular does not * simply replace the reference bound to 'prop', but recreates the whole object literal and passes a new reference into the * input, triggering ngOnChanges. * * @param binding - The previous bindings * @param context - The current context object * @param parserConfig - The current parser config */ updateInputBindingIfStale(binding, context, parserConfig) { if (Object.keys(binding.boundContextVariables).length > 0) { // Check if bound context vars have changed let boundContextVarHasChanged = false; for (const [contextVarName, contextVarValue] of Object.entries(binding.boundContextVariables)) { const encodedContextVarName = this.dataTypeParser.encodeDataTypeString(contextVarName); // Compare with previous value const newContextVarValue = this.dataTypeParser.loadContextVariable(encodedContextVarName, context, undefined, parserConfig.unescapeStrings, {}, parserConfig.allowContextFunctionCalls); if (newContextVarValue !== contextVarValue) { boundContextVarHasChanged = true; break; } } // Bound context var has changed! Reevaluate whole binding (which may include more than one context var, or point to some child property) if (boundContextVarHasChanged) { binding.boundContextVariables = {}; binding.value = this.dataTypeParser.evaluate(binding.raw, parserConfig.allowContextInBindings ? context : {}, undefined, parserConfig.unescapeStrings, binding.boundContextVariables, parserConfig.allowContextFunctionCalls); } } } // Outputs // ------------------------------------------------------------------------------------- /** * Checks output bindings and evaluates/updates them as needed * * @param bindings - A list of @Output() bindings * @param parserConfig - The current parser config * @param options - The current ParseOptions */ checkOutputBindings(bindings, parserConfig, options) { for (const [outputName, outputBinding] of Object.entries(bindings)) { // Unlike inputs, outputs only need to be created once by the parser, never updated, as you only create a wrapper function around the logic to execute. // As this logic is run fresh whenever the output triggers, there is no need to replace this wrapper function on updates. if (!outputBinding.parsed) { outputBinding.value = (event, context) => { try { this.dataTypeParser.evaluate(outputBinding.raw, parserConfig.allowContextInBindings ? context : {}, event, parserConfig.unescapeStrings, outputBinding.boundContextVariables, parserConfig.allowContextFunctionCalls); } catch (e) { this.logger.error([`Hook output parsing error\nselector: ` + parserConfig.selector + `\noutput: ` + outputName + `\nvalue: "` + outputBinding.value + `"`], options); this.logger.error([e.stack], options); } }; outputBinding.parsed = true; } } } static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.12", ngImport: i0, type: BindingsValueManager, deps: [{ token: i1.DataTypeParser }, { token: i2.Logger }], target: i0.ɵɵFactoryTarget.Injectable }); } static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "17.3.12", ngImport: i0, type: BindingsValueManager, providedIn: 'root' }); } } i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.12", ngImport: i0, type: BindingsValueManager, decorators: [{ type: Injectable, args: [{ providedIn: 'root' }] }], ctorParameters: () => [{ type: i1.DataTypeParser }, { type: i2.Logger }] }); //# 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{ Injectable } from '@angular/core';\n\nimport { DataTypeParser } from '../../services/utils/dataTypeParser';\nimport { SelectorHookParserConfig } from './selectorHookParserConfig';\nimport { RichBindingData } from '../../interfaces';\nimport { Logger } from '../../services/utils/logger';\nimport { ParseOptions } from '../../services/settings/options';\n\n\n/**\n * A helper service for the SelectorHookParsers that evaluates bindings and only updates them when needed so references are retained when possible\n */\n@Injectable({\n  providedIn: 'root'\n})\nexport class BindingsValueManager {\n\n  constructor(private dataTypeParser: DataTypeParser, private logger: Logger) {\n  }\n\n  // Inputs\n  // -------------------------------------------------------------------------------------\n\n  /**\n   * Checks input bindings and evaluates/updates them as needed\n   *\n   * @param bindings - A list of @Input() bindings\n   * @param context - The current context object\n   * @param parserConfig - The parser config\n   * @param options - The current ParseOptions\n   */\n  checkInputBindings(bindings: {[key: string]: RichBindingData}, context: any, parserConfig: SelectorHookParserConfig, options: ParseOptions) {\n    for (const [inputName, inputBinding] of Object.entries(bindings)) {\n      // If no need to parse, use raw as value\n      if (!parserConfig.parseInputs) {\n        inputBinding.value = inputBinding.raw;\n    \n      } else {\n        // If not yet parsed, do so\n        if (!inputBinding.parsed) {\n          try {\n            inputBinding.value = this.dataTypeParser.evaluate(\n              inputBinding.raw,\n              parserConfig.allowContextInBindings ? context : {},\n              undefined,\n              parserConfig.unescapeStrings,\n              inputBinding.boundContextVariables,\n              parserConfig.allowContextFunctionCalls,\n              options\n            );\n            inputBinding.parsed = true;\n          } catch (e: any) {\n            this.logger.error([`Hook input parsing error\\nselector: ` + parserConfig.selector +  `\\ninput: ` + inputName + `\\nvalue: \"` + inputBinding.value + `\"`], options);\n            this.logger.error([e.stack], options);\n            // If binding could not be parsed at all due to syntax error, remove from list of inputs.\n            // No amount of calls to updateInputBindings() will fix this kind of error.\n            delete bindings[inputName];\n          }\n\n        // Otherwise check if needs an update\n        } else {\n          this.updateInputBindingIfStale(inputBinding, context, parserConfig);\n        }\n      }\n    }\n  }\n\n  /**\n   * We can detect if a binding needs to be reevaluated via the bound context variables. There are three cases to consider:\n   *\n   * a) If a binding does not use context vars, don't reevaluate (binding is static and won't ever need to be updated)\n   * b) If a binding does use context vars, but context vars haven't changed, don't reevaluate either (would evalute the same)\n   * c) If a binding uses context vars and they have changed, reevaluate the binding from scratch to get the new version\n   *\n   * This is in line with the standard Angular behavior when evaluating template vars like [input]=\"{prop: this.something}\".\n   * When 'this.something' changes so that it returns false on a === comparison with its previous value, Angular does not\n   * simply replace the reference bound to 'prop', but recreates the whole object literal and passes a new reference into the\n   * input, triggering ngOnChanges.\n   *\n   * @param binding - The previous bindings\n   * @param context - The current context object\n   * @param parserConfig - The current parser config\n   */\n  private updateInputBindingIfStale(binding: RichBindingData, context: any, parserConfig: SelectorHookParserConfig): void {\n\n    if (Object.keys(binding.boundContextVariables).length > 0) {\n      // Check if bound context vars have changed\n      let boundContextVarHasChanged = false;\n      for (const [contextVarName, contextVarValue] of Object.entries(binding.boundContextVariables)) {\n        const encodedContextVarName = this.dataTypeParser.encodeDataTypeString(contextVarName);\n        // Compare with previous value\n        const newContextVarValue = this.dataTypeParser.loadContextVariable(encodedContextVarName, context, undefined, parserConfig.unescapeStrings, {}, parserConfig.allowContextFunctionCalls);\n        if (newContextVarValue !== contextVarValue) {\n          boundContextVarHasChanged = true;\n          break;\n        }\n      }\n\n      // Bound context var has changed! Reevaluate whole binding (which may include more than one context var, or point to some child property)\n      if (boundContextVarHasChanged) {\n        binding.boundContextVariables = {};\n        binding.value = this.dataTypeParser.evaluate(\n          binding.raw,\n          parserConfig.allowContextInBindings ? context : {},\n          undefined,\n          parserConfig.unescapeStrings,\n          binding.boundContextVariables,\n          parserConfig.allowContextFunctionCalls\n        );\n      }\n    }\n  }\n\n  // Outputs\n  // -------------------------------------------------------------------------------------\n\n  /**\n   * Checks output bindings and evaluates/updates them as needed\n   *\n   * @param bindings - A list of @Output() bindings\n   * @param parserConfig - The current parser config\n   * @param options - The current ParseOptions\n   */\n  checkOutputBindings(bindings: {[key: string]: RichBindingData}, parserConfig: SelectorHookParserConfig, options: ParseOptions) {\n    for (const [outputName, outputBinding] of Object.entries(bindings)) {\n      // Unlike inputs, outputs only need to be created once by the parser, never updated, as you only create a wrapper function around the logic to execute.\n      // As this logic is run fresh whenever the output triggers, there is no need to replace this wrapper function on updates.\n      if (!outputBinding.parsed) {\n        outputBinding.value = (event: any, context: any) => {\n          try {\n            this.dataTypeParser.evaluate(\n              outputBinding.raw,\n              parserConfig.allowContextInBindings ? context : {},\n              event,\n              parserConfig.unescapeStrings,\n              outputBinding.boundContextVariables,\n              parserConfig.allowContextFunctionCalls\n            );\n          } catch (e: any) {\n            this.logger.error([`Hook output parsing error\\nselector: ` + parserConfig.selector +  `\\noutput: ` + outputName + `\\nvalue: \"` + outputBinding.value + `\"`], options);\n            this.logger.error([e.stack], options);\n          }\n        };\n        outputBinding.parsed = true;\n      }\n    }\n  }\n\n}\n"]}