Class: ArgumentStream
Constructors
new ArgumentStream()
new ArgumentStream(
results:ParserResult):ArgumentStream
Parameters
| Parameter | Type |
|---|---|
results | ParserResult |
Returns
Defined in
Properties
results
readonlyresults:ParserResult
Defined in
state
state:
State
Defined in
Accessors
finished
Get Signature
get finished():
boolean
Whether or not all ordered parameters were used.
Returns
boolean
Defined in
length
Get Signature
get length():
number
The amount of ordered parameters.
Returns
number
Defined in
remaining
Get Signature
get remaining():
number
The remaining amount of ordered parameters.
Returns
number
Defined in
used
Get Signature
get used():
number
The amount of ordered parameters that have been used.
Returns
number
Defined in
Methods
filter()
filter(
predicate: (value:string) =>boolean,from:number):Option<string[],boolean>
Parameters
| Parameter | Type |
|---|---|
predicate | (value: string) => boolean |
from | number |
Returns
Option<string[], boolean>
Defined in
filterAsync()
filterAsync(
predicate: (value:string) =>Promise<boolean>,from:number):Promise<Option<string[],boolean>>
Parameters
| Parameter | Type |
|---|---|
predicate | (value: string) => Promise<boolean> |
from | number |
Returns
Promise<Option<string[], boolean>>
Defined in
filterMap()
filterMap<
T>(predicate: (value:string) =>Option<T,boolean>,from:number):Option<T[],boolean>
Type Parameters
| Type Parameter |
|---|
T |
Parameters
| Parameter | Type |
|---|---|
predicate | (value: string) => Option<T, boolean> |
from | number |
Returns
Option<T[], boolean>
Defined in
filterMapAsync()
filterMapAsync<
T>(predicate: (value:string) =>Promise<Option<T,boolean>>,from:number):Promise<Option<T[],boolean>>
Type Parameters
| Type Parameter |
|---|
T |
Parameters
| Parameter | Type |
|---|---|
predicate | (value: string) => Promise<Option<T, boolean>> |
from | number |
Returns
Promise<Option<T[], boolean>>
Defined in
find()
find(
predicate: (value:string) =>boolean,from:number):Option<string,boolean>
Returns the value of the first element in the array within Option.some where predicate returns true, and
Option.none otherwise.
Parameters
| Parameter | Type | Description |
|---|---|---|
predicate | (value: string) => boolean | find calls predicate once for each unused ordered parameter, in ascending order, until it finds one where predicate returns true. If such an element is found, find immediately returns a Option.some with that element value. Otherwise, find returns Option.none. |
from | number | The position where to start looking for unused parameters, defaults to current position. |
Returns
Option<string, boolean>
The found parameter's value.
Note
This does not support asynchronous results, refer to findAsync.
Example
// Suppose args are from 'ba aa cc'.
console.log(args.find((value) => value.startsWith('a')));
// Some { value: 'aa' }
Defined in
findAsync()
findAsync(
predicate: (value:string) =>Promise<boolean>,from:number):Promise<Option<string,boolean>>
Returns the value of the first element in the array within Option.some where predicate returns true, and
Option.none otherwise.
Parameters
| Parameter | Type | Description |
|---|---|---|
predicate | (value: string) => Promise<boolean> | find calls predicate once for each unused ordered parameter, in ascending order, until it finds one where predicate returns true. If such an element is found, find immediately returns a Option.some with that element value. Otherwise, find returns Option.none. |
from | number | The position where to start looking for unused parameters, defaults to current position. |
Returns
Promise<Option<string, boolean>>
The found parameter's value.
Note
This is an asynchronous variant of find.
Example
// Suppose args are from 'ba aa cc'.
console.log(args.find((value) => value.startsWith('a')));
// Some { value: 'aa' }
Defined in
findMap()
findMap<
T>(predicate: (value:string) =>Option<T,boolean>,from:number):Option<T,boolean>
Returns the value of the first element in the array within Option.some where predicate returns Some, and
Option.none otherwise.
Type Parameters
| Type Parameter |
|---|
T |
Parameters
| Parameter | Type | Description |
|---|---|---|
predicate | (value: string) => Option<T, boolean> | find calls predicate once for each unused ordered parameter, in ascending order, until it finds one where predicate returns Some. If such an element is found, find immediately returns the returned value. Otherwise, find returns Option.none. |
from | number | The position where to start looking for unused parameters, defaults to current position. |
Returns
Option<T, boolean>
The found parameter's value.
Note
This does not support asynchronous results, refer to findMapAsync.
Example
// Suppose args are from 'ba aa cc'.
console.log(args.find((value) => value.startsWith('a')));
// Some { value: 'aa' }
Typeparam
T The output type.
Defined in
findMapAsync()
findMapAsync<
T>(predicate: (value:string) =>Promise<Option<T,boolean>>,from:number):Promise<Option<T,boolean>>
Returns the value of the first element in the array within Option.some where predicate returns Some, and
Option.none otherwise.
Type Parameters
| Type Parameter |
|---|
T |
Parameters
| Parameter | Type | Description |
|---|---|---|
predicate | (value: string) => Promise<Option<T, boolean>> | find calls predicate once for each unused ordered parameter, in ascending order, until it finds one where predicate returns Some. If such an element is found, find immediately returns the returned value. Otherwise, find returns Option.none. |
from | number | The position where to start looking for unused parameters, defaults to current position. |
Returns
Promise<Option<T, boolean>>
The found parameter's value.
Note
This is an asynchronous variant of findMap.
Example
// Suppose args are from 'ba aa cc'.
console.log(args.find((value) => value.startsWith('a')));
// Some { value: 'aa' }
Typeparam
T The output type.
Defined in
findParse()
findParse<
T,E>(predicate: (value:string) =>Result<T,E,boolean>,from:number):Result<T,E[],boolean>
Finds and retrieves the first unused parameter that could be transformed.
Type Parameters
| Type Parameter |
|---|
T |
E |
Parameters
| Parameter | Type | Description |
|---|---|---|
predicate | (value: string) => Result<T, E, boolean> | findParse calls predicate once for each unused ordered parameter, in ascending order, until it finds one where predicate returns Ok. If such an element is found, findParse immediately returns the returned value. Otherwise, findParse returns Result.Err with all the returned errors. |
from | number | The position where to start looking for unused parameters, defaults to current position. |
Returns
Result<T, E[], boolean>
The found parameter's value.
Note
This is a variant of findMap that returns the errors on failure.
Note
This does not support asynchronous results, refer to findParseAsync.
Example
const parse = (value) => {
const number = Number(value);
return Number.isNaN(number)
? Result.err(`Could not parse ${value} to a number`)
: Result.ok(number);
};
// Suppose args are from 'ba 1 cc'.
console.log(args.findParse(parse));
// Ok { value: 1 }
console.log(args.findParse(parse));
// Err {
// error: [
// 'Could not parse ba to a number',
// 'Could not parse cc to a number'
// ]
// }
Typeparam
T The output type.
Typeparam
E The error type.
Defined in
findParseAsync()
findParseAsync<
T,E>(predicate: (value:string) =>Promise<Result<T,E,boolean>>,from:number):Promise<Result<T,E[],boolean>>
Finds and retrieves the first unused parameter that could be transformed.
Type Parameters
| Type Parameter |
|---|
T |
E |
Parameters
| Parameter | Type | Description |
|---|---|---|
predicate | (value: string) => Promise<Result<T, E, boolean>> | findParse calls predicate once for each unused ordered parameter, in ascending order, until it finds one where predicate returns Ok. If such an element is found, findParse immediately returns the returned value. Otherwise, findParse returns Result.Err with all the returned errors. |
from | number | The position where to start looking for unused parameters, defaults to current position. |
Returns
Promise<Result<T, E[], boolean>>
The found parameter's value.
Note
This is a variant of findMapAsync that returns the errors on failure.
Note
This is an asynchronous variant of findParse.
Typeparam
T The output type.
Typeparam
E The error type.
Defined in
flag()
flag(...
keys: readonlystring[]):boolean
Checks whether any of the flags were given.
Parameters
| Parameter | Type | Description |
|---|---|---|
...keys | readonly string[] | The names of the flags to check. |
Returns
boolean
Whether or not any of the flags were given.
Example
// Assume args are '--f --g':
console.log(args.flag('f'));
// true
console.log(args.flag('g', 'h'));
// true
console.log(args.flag('h'));
// false
Defined in
many()
many(
limit:number,from:number):Option<Parameter[],boolean>
Retrieves multiple unused parameters.
Parameters
| Parameter | Type | Default value | Description |
|---|---|---|---|
limit | number | Infinity | The maximum amount of parameters to retrieve, defaults to Infinity. |
from | number | ... | The position where to start looking for unused parameters, defaults to current position. |
Returns
Option<Parameter[], boolean>
The unused parameters within the range.
Examples
// Assume args are '1 2 3':
console.log(join(args.many().unwrap()));
// '1 2 3'
// Assume args are '1 2 3':
console.log(join(args.many(2).unwrap()));
// '1 2'
Defined in
option()
option(...
keys: readonlystring[]):Option<string,boolean>
Gets the last value of any option. When there are multiple names, the last value of the last found name is given.
Parameters
| Parameter | Type | Description |
|---|---|---|
...keys | readonly string[] | The names of the options to check. |
Returns
Option<string, boolean>
The last value of the option, if any.
Example
// Assume args are '--a=1 --b=2 --c=3'.
console.log(args.option('a'));
// Some { value: '1' }
console.log(args.option('b', 'c'));
// Some { value: '3' }
console.log(args.option('d'));
// None {}
Defined in
options()
options(...
keys: readonlystring[]):Option<readonlystring[],boolean>
Gets all values from all options.
Parameters
| Parameter | Type | Description |
|---|---|---|
...keys | readonly string[] | The names of the options to check. |
Returns
Option<readonly string[], boolean>
The values from all the options concatenated, if any.
Example
// Assume args are '--a=1 --a=1 --b=2 --c=3'.
console.log(args.option('a'));
// Some { value: ['1', '1'] }
console.log(args.option('b', 'c'));
// Some { value: ['2', '3'] }
console.log(args.option('d'));
// None {}
Defined in
reset()
reset():
void
Returns
void
Defined in
restore()
restore(
state:State):void
Parameters
| Parameter | Type |
|---|---|
state | State |
Returns
void
Defined in
save()
save():
State
Returns
Defined in
single()
single():
Option<string,boolean>
Retrieves the value of the next unused ordered token.
Returns
Option<string, boolean>
The value, if any.
Example
// Assume args are '1 2 3':
console.log(args.single());
// Ok { value: '1' }
console.log(args.single());
// Ok { value: '2' }
console.log(args.single());
// Ok { value: '3' }
console.log(args.single());
// None
Defined in
singleMap()
singleMap<
T>(predicate: (value:string) =>Option<T,boolean>,useAnyways:boolean):Option<T,boolean>
Retrieves the value of the next unused ordered token, but only if it could be transformed.
Type Parameters
| Type Parameter |
|---|
T |
Parameters
| Parameter | Type | Default value | Description |
|---|---|---|---|
predicate | (value: string) => Option<T, boolean> | undefined | The predicate that determines the parameter's mapped value, or nothing if failed. |
useAnyways | boolean | false | Whether to consider the parameter used even if the mapping failed. Defaults to false. |
Returns
Option<T, boolean>
The mapped value, if any.
Note
This does not support asynchronous results, refer to singleMapAsync.
Example
const parse = (value) => {
const number = Number(value);
return Number.isNaN(number) ? Option.none : Option.some(number);
};
// Assume args are '1 2 3':
console.log(args.singleMap(parse));
// Some { value: 1 }
console.log(args.singleMap(parse));
// Some { value: 2 }
console.log(args.singleMap(parse));
// Some { value: 3 }
console.log(args.singleMap(parse));
// None
Typeparam
T The output type.
Defined in
singleMapAsync()
singleMapAsync<
T>(predicate: (value:string) =>Promise<Option<T,boolean>>,useAnyways:boolean):Promise<Option<T,boolean>>
Retrieves the value of the next unused ordered token, but only if it could be transformed.
Type Parameters
| Type Parameter |
|---|
T |
Parameters
| Parameter | Type | Default value | Description |
|---|---|---|---|
predicate | (value: string) => Promise<Option<T, boolean>> | undefined | The predicate that determines the parameter's mapped value, or nothing if failed. |
useAnyways | boolean | false | Whether to consider the parameter used even if the mapping failed. Defaults to false. |
Returns
Promise<Option<T, boolean>>
The mapped value, if any.
Note
This is an asynchronous variant of singleMap.
Typeparam
T The output type.
Defined in
singleParse()
singleParse<
T,E>(predicate: (value:string) =>Result<T,E,boolean>,useAnyways:boolean):Result<T,null|E,boolean>
Finds and retrieves the next unused parameter and transforms it.
Type Parameters
| Type Parameter |
|---|
T |
E |
Parameters
| Parameter | Type | Default value | Description |
|---|---|---|---|
predicate | (value: string) => Result<T, E, boolean> | undefined | The predicate that determines the parameter's transformed value, or nothing if failed. |
useAnyways | boolean | false | Whether to consider the parameter used even if the transformation failed. Defaults to false. |
Returns
Result<T, null | E, boolean>
The transformed value, if any.
Note
This is a variant of findMap that returns the errors on failure.
Note
This does not support asynchronous results, refer to singleParseAsync.
Example
const parse = (value) => {
const number = Number(value);
return Number.isNaN(number)
? Result.err(`Could not parse ${value} to a number`)
: Result.ok(number);
};
// Assume args are '1 2 3':
console.log(args.singleParse(parse));
// Ok { value: 1 }
console.log(args.singleParse(parse));
// Ok { value: 2 }
console.log(args.singleParse(parse));
// Ok { value: 3 }
console.log(args.singleParse(parse));
// Err { error: null }
Typeparam
T The output type.
Typeparam
E The error type.
Defined in
singleParseAsync()
singleParseAsync<
T,E>(predicate: (value:string) =>Promise<Result<T,E,boolean>>,useAnyways:boolean):Promise<Result<T,null|E,boolean>>
Retrieves the value of the next unused ordered token, but only if it could be transformed.
Type Parameters
| Type Parameter |
|---|
T |
E |
Parameters
| Parameter | Type | Default value | Description |
|---|---|---|---|
predicate | (value: string) => Promise<Result<T, E, boolean>> | undefined | The predicate that determines the parameter's mapped value, or nothing if failed. |
useAnyways | boolean | false | Whether to consider the parameter used even if the mapping failed. Defaults to false. |
Returns
Promise<Result<T, null | E, boolean>>
The mapped value, if any.
Note
This is an asynchronous variant of singleParse.
Typeparam
T The output type.
Typeparam
E The error type.