@aws-cdk/core
Version:
AWS Cloud Development Kit Core Library
161 lines • 18.7 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const lazy_1 = require("./lazy");
const encoding_1 = require("./private/encoding");
const intrinsic_1 = require("./private/intrinsic");
const resolve_1 = require("./private/resolve");
const token_map_1 = require("./private/token-map");
/**
* Represents a special or lazily-evaluated value.
*
* Can be used to delay evaluation of a certain value in case, for example,
* that it requires some context or late-bound data. Can also be used to
* mark values that need special processing at document rendering time.
*
* Tokens can be embedded into strings while retaining their original
* semantics.
*/
class Token {
/**
* Returns true if obj represents an unresolved value
*
* One of these must be true:
*
* - `obj` is an IResolvable
* - `obj` is a string containing at least one encoded `IResolvable`
* - `obj` is either an encoded number or list
*
* This does NOT recurse into lists or objects to see if they
* containing resolvables.
*
* @param obj The object to test.
*/
static isUnresolved(obj) {
return encoding_1.unresolved(obj);
}
/**
* Return a reversible string representation of this token
*
* If the Token is initialized with a literal, the stringified value of the
* literal is returned. Otherwise, a special quoted string representation
* of the Token is returned that can be embedded into other strings.
*
* Strings with quoted Tokens in them can be restored back into
* complex values with the Tokens restored by calling `resolve()`
* on the string.
*/
static asString(value, options = {}) {
if (typeof value === 'string') {
return value;
}
return token_map_1.TokenMap.instance().registerString(Token.asAny(value), options.displayHint);
}
/**
* Return a reversible number representation of this token
*/
static asNumber(value) {
if (typeof value === 'number') {
return value;
}
return token_map_1.TokenMap.instance().registerNumber(Token.asAny(value));
}
/**
* Return a reversible list representation of this token
*/
static asList(value, options = {}) {
if (Array.isArray(value) && value.every(x => typeof x === 'string')) {
return value;
}
return token_map_1.TokenMap.instance().registerList(Token.asAny(value), options.displayHint);
}
/**
* Return a resolvable representation of the given value
*/
static asAny(value) {
return isResolvableObject(value) ? value : new intrinsic_1.Intrinsic(value);
}
constructor() {
}
}
exports.Token = Token;
/**
* Less oft-needed functions to manipulate Tokens
*/
class Tokenization {
/**
* Un-encode a string potentially containing encoded tokens
*/
static reverseString(s) {
return token_map_1.TokenMap.instance().splitString(s);
}
/**
* Un-encode a Tokenized value from a number
*/
static reverseNumber(n) {
return token_map_1.TokenMap.instance().lookupNumberToken(n);
}
/**
* Un-encode a Tokenized value from a list
*/
static reverseList(l) {
return token_map_1.TokenMap.instance().lookupList(l);
}
/**
* Resolves an object by evaluating all tokens and removing any undefined or empty objects or arrays.
* Values can only be primitives, arrays or tokens. Other objects (i.e. with methods) will be rejected.
*
* @param obj The object to resolve.
* @param options Prefix key path components for diagnostics.
*/
static resolve(obj, options) {
return resolve_1.resolve(obj, {
scope: options.scope,
resolver: options.resolver,
preparing: (options.preparing !== undefined ? options.preparing : false)
});
}
/**
* Return whether the given object is an IResolvable object
*
* This is different from Token.isUnresolved() which will also check for
* encoded Tokens, whereas this method will only do a type check on the given
* object.
*/
static isResolvable(obj) {
return isResolvableObject(obj);
}
/**
* Stringify a number directly or lazily if it's a Token. If it is an object (i.e., { Ref: 'SomeLogicalId' }), return it as-is.
*/
static stringifyNumber(x) {
// only convert numbers to strings so that Refs, conditions, and other things don't end up synthesizing as [object object]
if (Token.isUnresolved(x)) {
return lazy_1.Lazy.stringValue({ produce: context => {
const resolved = context.resolve(x);
return typeof resolved !== 'number' ? resolved : `${resolved}`;
} });
}
else {
return typeof x !== 'number' ? x : `${x}`;
}
}
constructor() {
}
}
exports.Tokenization = Tokenization;
function isResolvableObject(x) {
return typeof (x) === 'object' && x !== null && typeof x.resolve === 'function';
}
exports.isResolvableObject = isResolvableObject;
function withResolved(...args) {
if (args.length < 2) {
return;
}
const argArray = args.slice(0, args.length - 1);
if (argArray.some(Token.isUnresolved)) {
return;
}
args[args.length - 1].apply(arguments, argArray);
}
exports.withResolved = withResolved;
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Can also be used to\n * mark values that need special processing at document rendering time.\n *\n * Tokens can be embedded into strings while retaining their original\n * semantics.\n */\nexport class Token {\n  /**\n   * Returns true if obj represents an unresolved value\n   *\n   * One of these must be true:\n   *\n   * - `obj` is an IResolvable\n   * - `obj` is a string containing at least one encoded `IResolvable`\n   * - `obj` is either an encoded number or list\n   *\n   * This does NOT recurse into lists or objects to see if they\n   * containing resolvables.\n   *\n   * @param obj The object to test.\n   */\n  public static isUnresolved(obj: any): boolean {\n    return unresolved(obj);\n  }\n\n  /**\n   * Return a reversible string representation of this token\n   *\n   * If the Token is initialized with a literal, the stringified value of the\n   * literal is returned. Otherwise, a special quoted string representation\n   * of the Token is returned that can be embedded into other strings.\n   *\n   * Strings with quoted Tokens in them can be restored back into\n   * complex values with the Tokens restored by calling `resolve()`\n   * on the string.\n   */\n  public static asString(value: any, options: EncodingOptions = {}): string {\n    if (typeof value === 'string') { return value; }\n    return TokenMap.instance().registerString(Token.asAny(value), options.displayHint);\n  }\n\n  /**\n   * Return a reversible number representation of this token\n   */\n  public static asNumber(value: any): number {\n    if (typeof value === 'number') { return value; }\n    return TokenMap.instance().registerNumber(Token.asAny(value));\n  }\n\n  /**\n   * Return a reversible list representation of this token\n   */\n  public static asList(value: any, options: EncodingOptions = {}): string[] {\n    if (Array.isArray(value) && value.every(x => typeof x === 'string')) { return value; }\n    return TokenMap.instance().registerList(Token.asAny(value), options.displayHint);\n  }\n\n  /**\n   * Return a resolvable representation of the given value\n   */\n  public static asAny(value: any): IResolvable {\n    return isResolvableObject(value) ? value : new Intrinsic(value);\n  }\n\n  private constructor() {\n  }\n}\n\n/**\n * Less oft-needed functions to manipulate Tokens\n */\nexport class Tokenization {\n  /**\n   * Un-encode a string potentially containing encoded tokens\n   */\n  public static reverseString(s: string): TokenizedStringFragments {\n    return TokenMap.instance().splitString(s);\n  }\n\n  /**\n   * Un-encode a Tokenized value from a number\n   */\n  public static reverseNumber(n: number): IResolvable | undefined {\n    return TokenMap.instance().lookupNumberToken(n);\n  }\n\n  /**\n   * Un-encode a Tokenized value from a list\n   */\n  public static reverseList(l: string[]): IResolvable | undefined {\n    return TokenMap.instance().lookupList(l);\n  }\n\n  /**\n   * Resolves an object by evaluating all tokens and removing any undefined or empty objects or arrays.\n   * Values can only be primitives, arrays or tokens. Other objects (i.e. with methods) will be rejected.\n   *\n   * @param obj The object to resolve.\n   * @param options Prefix key path components for diagnostics.\n   */\n  public static resolve(obj: any, options: ResolveOptions): any {\n    return resolve(obj, {\n      scope: options.scope,\n      resolver: options.resolver,\n      preparing: (options.preparing !== undefined ? options.preparing : false)\n    });\n  }\n\n  /**\n   * Return whether the given object is an IResolvable object\n   *\n   * This is different from Token.isUnresolved() which will also check for\n   * encoded Tokens, whereas this method will only do a type check on the given\n   * object.\n   */\n  public static isResolvable(obj: any): obj is IResolvable {\n    return isResolvableObject(obj);\n  }\n\n  /**\n   * Stringify a number directly or lazily if it's a Token. If it is an object (i.e., { Ref: 'SomeLogicalId' }), return it as-is.\n   */\n  public static stringifyNumber(x: number) {\n    // only convert numbers to strings so that Refs, conditions, and other things don't end up synthesizing as [object object]\n\n    if (Token.isUnresolved(x)) {\n      return Lazy.stringValue({ produce: context => {\n          const resolved = context.resolve(x);\n          return typeof resolved !== 'number' ? resolved : `${resolved}`;\n        } });\n    } else {\n      return typeof x !== 'number' ? x : `${x}`;\n    }\n  }\n\n  private constructor() {\n  }\n}\n\n/**\n * Options to the resolve() operation\n *\n * NOT the same as the ResolveContext; ResolveContext is exposed to Token\n * implementors and resolution hooks, whereas this struct is just to bundle\n * a number of things that would otherwise be arguments to resolve() in a\n * readable way.\n */\nexport interface ResolveOptions {\n  /**\n   * The scope from which resolution is performed\n   */\n  readonly scope: IConstruct;\n\n  /**\n   * The resolver to apply to any resolvable tokens found\n   */\n  readonly resolver: ITokenResolver;\n\n  /**\n   * Whether the resolution is being executed during the prepare phase or not.\n   * @default false\n   */\n  readonly preparing?: boolean;\n}\n\n/**\n * Properties to string encodings\n */\nexport interface EncodingOptions {\n  /**\n   * A hint for the Token's purpose when stringifying it\n   */\n  readonly displayHint?: string;\n}\n\nexport function isResolvableObject(x: any): x is IResolvable {\n  return typeof(x) === 'object' && x !== null && typeof x.resolve === 'function';\n}\n\n/**\n * Call the given function only if all given values are resolved\n *\n * Exported as a function since it will be used by TypeScript modules, but\n * can't be exposed via JSII because of the generics.\n */\nexport function withResolved<A>(a: A, fn: (a: A) => void): void;\nexport function withResolved<A, B>(a: A, b: B, fn: (a: A, b: B) => void): void;\nexport function withResolved<A, B, C>(a: A, b: B, c: C, fn: (a: A, b: B, c: C) => void): void;\nexport function withResolved(...args: any[]) {\n  if (args.length < 2) { return; }\n  const argArray = args.slice(0, args.length - 1);\n  if (argArray.some(Token.isUnresolved)) { return; }\n  args[args.length - 1].apply(arguments, argArray);\n}\n"]}