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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| import { Matcher, MatchResult } from './matcher'; | ||
| import { Type, getType } from './private/type'; | ||
|
|
||
| /** | ||
| * Capture values while matching templates. | ||
| * Using an instance of this class within a Matcher will capture the matching value. | ||
| * The `as*()` APIs on the instance can be used to get the captured value. | ||
| */ | ||
| export class Capture extends Matcher { | ||
| public readonly name: string; | ||
| private value: any = null; | ||
|
|
||
| constructor() { | ||
| super(); | ||
| this.name = 'Capture'; | ||
| } | ||
|
|
||
| public test(actual: any): MatchResult { | ||
| this.value = actual; | ||
|
|
||
| const result = new MatchResult(actual); | ||
| if (actual == null) { | ||
| result.push(this, [], `Can only capture non-nullish values. Found ${actual}`); | ||
| } | ||
| return result; | ||
| } | ||
|
|
||
| /** | ||
| * Retrieve the captured value as a string. | ||
| * An error is generated if no value is captured or if the value is not a string. | ||
| */ | ||
| public asString(): string { | ||
| this.checkNotNull(); | ||
| if (getType(this.value) === 'string') { | ||
| return this.value; | ||
| } | ||
| this.reportIncorrectType('string'); | ||
| } | ||
|
|
||
| /** | ||
| * Retrieve the captured value as a number. | ||
| * An error is generated if no value is captured or if the value is not a number. | ||
| */ | ||
| public asNumber(): number { | ||
| this.checkNotNull(); | ||
| if (getType(this.value) === 'number') { | ||
| return this.value; | ||
| } | ||
| this.reportIncorrectType('number'); | ||
| } | ||
|
|
||
| /** | ||
| * Retrieve the captured value as a boolean. | ||
| * An error is generated if no value is captured or if the value is not a boolean. | ||
| */ | ||
| public asBoolean(): boolean { | ||
| this.checkNotNull(); | ||
| if (getType(this.value) === 'boolean') { | ||
| return this.value; | ||
| } | ||
| this.reportIncorrectType('boolean'); | ||
| } | ||
|
|
||
| /** | ||
| * Retrieve the captured value as an array. | ||
| * An error is generated if no value is captured or if the value is not an array. | ||
| */ | ||
| public asArray(): any[] { | ||
| this.checkNotNull(); | ||
| if (getType(this.value) === 'array') { | ||
| return this.value; | ||
| } | ||
| this.reportIncorrectType('array'); | ||
| } | ||
|
|
||
| /** | ||
| * Retrieve the captured value as a JSON object. | ||
| * An error is generated if no value is captured or if the value is not an object. | ||
| */ | ||
| public asObject(): { [key: string]: any } { | ||
| this.checkNotNull(); | ||
| if (getType(this.value) === 'object') { | ||
| return this.value; | ||
| } | ||
| this.reportIncorrectType('object'); | ||
| } | ||
|
|
||
| private checkNotNull(): void { | ||
| if (this.value == null) { | ||
| throw new Error('No value captured'); | ||
| } | ||
| } | ||
|
|
||
| private reportIncorrectType(expected: Type): never { | ||
| throw new Error(`Captured value is expected to be ${expected} but found ${getType(this.value)}. ` + | ||
| `Value is ${JSON.stringify(this.value, undefined, 2)}`); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,4 @@ | ||
| export * from './capture'; | ||
| export * from './template'; | ||
| export * from './match'; | ||
| export * from './matcher'; |
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