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Angular - commonly needed directives and services
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.dev/license
*/
/**
* Provides encoding and decoding of URL parameter and query-string values.
*
* Serializes and parses URL parameter keys and values to encode and decode them.
* If you pass URL query parameters without encoding,
* the query parameters can be misinterpreted at the receiving end.
*
*
* @publicApi
*/
export class HttpUrlEncodingCodec {
/**
* Encodes a key name for a URL parameter or query-string.
* @param key The key name.
* @returns The encoded key name.
*/
encodeKey(key) {
return standardEncoding(key);
}
/**
* Encodes the value of a URL parameter or query-string.
* @param value The value.
* @returns The encoded value.
*/
encodeValue(value) {
return standardEncoding(value);
}
/**
* Decodes an encoded URL parameter or query-string key.
* @param key The encoded key name.
* @returns The decoded key name.
*/
decodeKey(key) {
return decodeURIComponent(key);
}
/**
* Decodes an encoded URL parameter or query-string value.
* @param value The encoded value.
* @returns The decoded value.
*/
decodeValue(value) {
return decodeURIComponent(value);
}
}
function paramParser(rawParams, codec) {
const map = new Map();
if (rawParams.length > 0) {
// The `window.location.search` can be used while creating an instance of the `HttpParams` class
// (e.g. `new HttpParams({ fromString: window.location.search })`). The `window.location.search`
// may start with the `?` char, so we strip it if it's present.
const params = rawParams.replace(/^\?/, '').split('&');
params.forEach((param) => {
const eqIdx = param.indexOf('=');
const [key, val] = eqIdx == -1
? [codec.decodeKey(param), '']
: [codec.decodeKey(param.slice(0, eqIdx)), codec.decodeValue(param.slice(eqIdx + 1))];
const list = map.get(key) || [];
list.push(val);
map.set(key, list);
});
}
return map;
}
/**
* Encode input string with standard encodeURIComponent and then un-encode specific characters.
*/
const STANDARD_ENCODING_REGEX = /%(\d[a-f0-9])/gi;
const STANDARD_ENCODING_REPLACEMENTS = {
'40': '@',
'3A': ':',
'24': '$',
'2C': ',',
'3B': ';',
'3D': '=',
'3F': '?',
'2F': '/',
};
function standardEncoding(v) {
return encodeURIComponent(v).replace(STANDARD_ENCODING_REGEX, (s, t) => STANDARD_ENCODING_REPLACEMENTS[t] ?? s);
}
function valueToString(value) {
return `${value}`;
}
/**
* An HTTP request/response body that represents serialized parameters,
* per the MIME type `application/x-www-form-urlencoded`.
*
* This class is immutable; all mutation operations return a new instance.
*
* @publicApi
*/
export class HttpParams {
constructor(options = {}) {
this.updates = null;
this.cloneFrom = null;
this.encoder = options.encoder || new HttpUrlEncodingCodec();
if (!!options.fromString) {
if (!!options.fromObject) {
throw new Error(`Cannot specify both fromString and fromObject.`);
}
this.map = paramParser(options.fromString, this.encoder);
}
else if (!!options.fromObject) {
this.map = new Map();
Object.keys(options.fromObject).forEach((key) => {
const value = options.fromObject[key];
// convert the values to strings
const values = Array.isArray(value) ? value.map(valueToString) : [valueToString(value)];
this.map.set(key, values);
});
}
else {
this.map = null;
}
}
/**
* Reports whether the body includes one or more values for a given parameter.
* @param param The parameter name.
* @returns True if the parameter has one or more values,
* false if it has no value or is not present.
*/
has(param) {
this.init();
return this.map.has(param);
}
/**
* Retrieves the first value for a parameter.
* @param param The parameter name.
* @returns The first value of the given parameter,
* or `null` if the parameter is not present.
*/
get(param) {
this.init();
const res = this.map.get(param);
return !!res ? res[0] : null;
}
/**
* Retrieves all values for a parameter.
* @param param The parameter name.
* @returns All values in a string array,
* or `null` if the parameter not present.
*/
getAll(param) {
this.init();
return this.map.get(param) || null;
}
/**
* Retrieves all the parameters for this body.
* @returns The parameter names in a string array.
*/
keys() {
this.init();
return Array.from(this.map.keys());
}
/**
* Appends a new value to existing values for a parameter.
* @param param The parameter name.
* @param value The new value to add.
* @return A new body with the appended value.
*/
append(param, value) {
return this.clone({ param, value, op: 'a' });
}
/**
* Constructs a new body with appended values for the given parameter name.
* @param params parameters and values
* @return A new body with the new value.
*/
appendAll(params) {
const updates = [];
Object.keys(params).forEach((param) => {
const value = params[param];
if (Array.isArray(value)) {
value.forEach((_value) => {
updates.push({ param, value: _value, op: 'a' });
});
}
else {
updates.push({ param, value: value, op: 'a' });
}
});
return this.clone(updates);
}
/**
* Replaces the value for a parameter.
* @param param The parameter name.
* @param value The new value.
* @return A new body with the new value.
*/
set(param, value) {
return this.clone({ param, value, op: 's' });
}
/**
* Removes a given value or all values from a parameter.
* @param param The parameter name.
* @param value The value to remove, if provided.
* @return A new body with the given value removed, or with all values
* removed if no value is specified.
*/
delete(param, value) {
return this.clone({ param, value, op: 'd' });
}
/**
* Serializes the body to an encoded string, where key-value pairs (separated by `=`) are
* separated by `&`s.
*/
toString() {
this.init();
return (this.keys()
.map((key) => {
const eKey = this.encoder.encodeKey(key);
// `a: ['1']` produces `'a=1'`
// `b: []` produces `''`
// `c: ['1', '2']` produces `'c=1&c=2'`
return this.map.get(key)
.map((value) => eKey + '=' + this.encoder.encodeValue(value))
.join('&');
})
// filter out empty values because `b: []` produces `''`
// which results in `a=1&&c=1&c=2` instead of `a=1&c=1&c=2` if we don't
.filter((param) => param !== '')
.join('&'));
}
clone(update) {
const clone = new HttpParams({ encoder: this.encoder });
clone.cloneFrom = this.cloneFrom || this;
clone.updates = (this.updates || []).concat(update);
return clone;
}
init() {
if (this.map === null) {
this.map = new Map();
}
if (this.cloneFrom !== null) {
this.cloneFrom.init();
this.cloneFrom.keys().forEach((key) => this.map.set(key, this.cloneFrom.map.get(key)));
this.updates.forEach((update) => {
switch (update.op) {
case 'a':
case 's':
const base = (update.op === 'a' ? this.map.get(update.param) : undefined) || [];
base.push(valueToString(update.value));
this.map.set(update.param, base);
break;
case 'd':
if (update.value !== undefined) {
let base = this.map.get(update.param) || [];
const idx = base.indexOf(valueToString(update.value));
if (idx !== -1) {
base.splice(idx, 1);
}
if (base.length > 0) {
this.map.set(update.param, base);
}
else {
this.map.delete(update.param);
}
}
else {
this.map.delete(update.param);
break;
}
}
});
this.cloneFrom = this.updates = null;
}
}
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.dev/license\n */\n\n/**\n * A codec for encoding and decoding parameters in URLs.\n *\n * Used by `HttpParams`.\n *\n * @publicApi\n **/\nexport interface HttpParameterCodec {\n  encodeKey(key: string): string;\n  encodeValue(value: string): string;\n\n  decodeKey(key: string): string;\n  decodeValue(value: string): string;\n}\n\n/**\n * Provides encoding and decoding of URL parameter and query-string values.\n *\n * Serializes and parses URL parameter keys and values to encode and decode them.\n * If you pass URL query parameters without encoding,\n * the query parameters can be misinterpreted at the receiving end.\n *\n *\n * @publicApi\n */\nexport class HttpUrlEncodingCodec implements HttpParameterCodec {\n  /**\n   * Encodes a key name for a URL parameter or query-string.\n   * @param key The key name.\n   * @returns The encoded key name.\n   */\n  encodeKey(key: string): string {\n    return standardEncoding(key);\n  }\n\n  /**\n   * Encodes the value of a URL parameter or query-string.\n   * @param value The value.\n   * @returns The encoded value.\n   */\n  encodeValue(value: string): string {\n    return standardEncoding(value);\n  }\n\n  /**\n   * Decodes an encoded URL parameter or query-string key.\n   * @param key The encoded key name.\n   * @returns The decoded key name.\n   */\n  decodeKey(key: string): string {\n    return decodeURIComponent(key);\n  }\n\n  /**\n   * Decodes an encoded URL parameter or query-string value.\n   * @param value The encoded value.\n   * @returns The decoded value.\n   */\n  decodeValue(value: string) {\n    return decodeURIComponent(value);\n  }\n}\n\nfunction paramParser(rawParams: string, codec: HttpParameterCodec): Map<string, string[]> {\n  const map = new Map<string, string[]>();\n  if (rawParams.length > 0) {\n    // The `window.location.search` can be used while creating an instance of the `HttpParams` class\n    // (e.g. `new HttpParams({ fromString: window.location.search })`). The `window.location.search`\n    // may start with the `?` char, so we strip it if it's present.\n    const params: string[] = rawParams.replace(/^\\?/, '').split('&');\n    params.forEach((param: string) => {\n      const eqIdx = param.indexOf('=');\n      const [key, val]: string[] =\n        eqIdx == -1\n          ? [codec.decodeKey(param), '']\n          : [codec.decodeKey(param.slice(0, eqIdx)), codec.decodeValue(param.slice(eqIdx + 1))];\n      const list = map.get(key) || [];\n      list.push(val);\n      map.set(key, list);\n    });\n  }\n  return map;\n}\n\n/**\n * Encode input string with standard encodeURIComponent and then un-encode specific characters.\n */\nconst STANDARD_ENCODING_REGEX = /%(\\d[a-f0-9])/gi;\nconst STANDARD_ENCODING_REPLACEMENTS: {[x: string]: string} = {\n  '40': '@',\n  '3A': ':',\n  '24': '$',\n  '2C': ',',\n  '3B': ';',\n  '3D': '=',\n  '3F': '?',\n  '2F': '/',\n};\n\nfunction standardEncoding(v: string): string {\n  return encodeURIComponent(v).replace(\n    STANDARD_ENCODING_REGEX,\n    (s, t) => STANDARD_ENCODING_REPLACEMENTS[t] ?? s,\n  );\n}\n\nfunction valueToString(value: string | number | boolean): string {\n  return `${value}`;\n}\n\ninterface Update {\n  param: string;\n  value?: string | number | boolean;\n  op: 'a' | 'd' | 's';\n}\n\n/**\n * Options used to construct an `HttpParams` instance.\n *\n * @publicApi\n */\nexport interface HttpParamsOptions {\n  /**\n   * String representation of the HTTP parameters in URL-query-string format.\n   * Mutually exclusive with `fromObject`.\n   */\n  fromString?: string;\n\n  /** Object map of the HTTP parameters. Mutually exclusive with `fromString`. */\n  fromObject?: {\n    [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;\n  };\n\n  /** Encoding codec used to parse and serialize the parameters. */\n  encoder?: HttpParameterCodec;\n}\n\n/**\n * An HTTP request/response body that represents serialized parameters,\n * per the MIME type `application/x-www-form-urlencoded`.\n *\n * This class is immutable; all mutation operations return a new instance.\n *\n * @publicApi\n */\nexport class HttpParams {\n  private map: Map<string, string[]> | null;\n  private encoder: HttpParameterCodec;\n  private updates: Update[] | null = null;\n  private cloneFrom: HttpParams | null = null;\n\n  constructor(options: HttpParamsOptions = {} as HttpParamsOptions) {\n    this.encoder = options.encoder || new HttpUrlEncodingCodec();\n    if (!!options.fromString) {\n      if (!!options.fromObject) {\n        throw new Error(`Cannot specify both fromString and fromObject.`);\n      }\n      this.map = paramParser(options.fromString, this.encoder);\n    } else if (!!options.fromObject) {\n      this.map = new Map<string, string[]>();\n      Object.keys(options.fromObject).forEach((key) => {\n        const value = (options.fromObject as any)[key];\n        // convert the values to strings\n        const values = Array.isArray(value) ? value.map(valueToString) : [valueToString(value)];\n        this.map!.set(key, values);\n      });\n    } else {\n      this.map = null;\n    }\n  }\n\n  /**\n   * Reports whether the body includes one or more values for a given parameter.\n   * @param param The parameter name.\n   * @returns True if the parameter has one or more values,\n   * false if it has no value or is not present.\n   */\n  has(param: string): boolean {\n    this.init();\n    return this.map!.has(param);\n  }\n\n  /**\n   * Retrieves the first value for a parameter.\n   * @param param The parameter name.\n   * @returns The first value of the given parameter,\n   * or `null` if the parameter is not present.\n   */\n  get(param: string): string | null {\n    this.init();\n    const res = this.map!.get(param);\n    return !!res ? res[0] : null;\n  }\n\n  /**\n   * Retrieves all values for a  parameter.\n   * @param param The parameter name.\n   * @returns All values in a string array,\n   * or `null` if the parameter not present.\n   */\n  getAll(param: string): string[] | null {\n    this.init();\n    return this.map!.get(param) || null;\n  }\n\n  /**\n   * Retrieves all the parameters for this body.\n   * @returns The parameter names in a string array.\n   */\n  keys(): string[] {\n    this.init();\n    return Array.from(this.map!.keys());\n  }\n\n  /**\n   * Appends a new value to existing values for a parameter.\n   * @param param The parameter name.\n   * @param value The new value to add.\n   * @return A new body with the appended value.\n   */\n  append(param: string, value: string | number | boolean): HttpParams {\n    return this.clone({param, value, op: 'a'});\n  }\n\n  /**\n   * Constructs a new body with appended values for the given parameter name.\n   * @param params parameters and values\n   * @return A new body with the new value.\n   */\n  appendAll(params: {\n    [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;\n  }): HttpParams {\n    const updates: Update[] = [];\n    Object.keys(params).forEach((param) => {\n      const value = params[param];\n      if (Array.isArray(value)) {\n        value.forEach((_value) => {\n          updates.push({param, value: _value, op: 'a'});\n        });\n      } else {\n        updates.push({param, value: value as string | number | boolean, op: 'a'});\n      }\n    });\n    return this.clone(updates);\n  }\n\n  /**\n   * Replaces the value for a parameter.\n   * @param param The parameter name.\n   * @param value The new value.\n   * @return A new body with the new value.\n   */\n  set(param: string, value: string | number | boolean): HttpParams {\n    return this.clone({param, value, op: 's'});\n  }\n\n  /**\n   * Removes a given value or all values from a parameter.\n   * @param param The parameter name.\n   * @param value The value to remove, if provided.\n   * @return A new body with the given value removed, or with all values\n   * removed if no value is specified.\n   */\n  delete(param: string, value?: string | number | boolean): HttpParams {\n    return this.clone({param, value, op: 'd'});\n  }\n\n  /**\n   * Serializes the body to an encoded string, where key-value pairs (separated by `=`) are\n   * separated by `&`s.\n   */\n  toString(): string {\n    this.init();\n    return (\n      this.keys()\n        .map((key) => {\n          const eKey = this.encoder.encodeKey(key);\n          // `a: ['1']` produces `'a=1'`\n          // `b: []` produces `''`\n          // `c: ['1', '2']` produces `'c=1&c=2'`\n          return this.map!.get(key)!\n            .map((value) => eKey + '=' + this.encoder.encodeValue(value))\n            .join('&');\n        })\n        // filter out empty values because `b: []` produces `''`\n        // which results in `a=1&&c=1&c=2` instead of `a=1&c=1&c=2` if we don't\n        .filter((param) => param !== '')\n        .join('&')\n    );\n  }\n\n  private clone(update: Update | Update[]): HttpParams {\n    const clone = new HttpParams({encoder: this.encoder} as HttpParamsOptions);\n    clone.cloneFrom = this.cloneFrom || this;\n    clone.updates = (this.updates || []).concat(update);\n    return clone;\n  }\n\n  private init() {\n    if (this.map === null) {\n      this.map = new Map<string, string[]>();\n    }\n    if (this.cloneFrom !== null) {\n      this.cloneFrom.init();\n      this.cloneFrom.keys().forEach((key) => this.map!.set(key, this.cloneFrom!.map!.get(key)!));\n      this.updates!.forEach((update) => {\n        switch (update.op) {\n          case 'a':\n          case 's':\n            const base = (update.op === 'a' ? this.map!.get(update.param) : undefined) || [];\n            base.push(valueToString(update.value!));\n            this.map!.set(update.param, base);\n            break;\n          case 'd':\n            if (update.value !== undefined) {\n              let base = this.map!.get(update.param) || [];\n              const idx = base.indexOf(valueToString(update.value));\n              if (idx !== -1) {\n                base.splice(idx, 1);\n              }\n              if (base.length > 0) {\n                this.map!.set(update.param, base);\n              } else {\n                this.map!.delete(update.param);\n              }\n            } else {\n              this.map!.delete(update.param);\n              break;\n            }\n        }\n      });\n      this.cloneFrom = this.updates = null;\n    }\n  }\n}\n"]}