pmfl

中文文档

A Javascript-specific pattern matching function library for implementing the if and else functions.

pmfl means pattern matching function library

• Implement the if/else function with a functional pattern matching API.
• Freely increase or decrease conditions, the code is more flexible.
• Not a substitute, but a supplement.
• Multiple complementary APIs for more powerful pattern matching.
• Depend on Immutable.js.

Sample program

import { pmfl } from 'pmfl'
pmfl.make().add("one",[1],(data)=>{console.log("it is one")})
.add("two",[2],(data)=>{console.log("it is two")})
.neither((data)=>{"it is neither"})
.match([2])
//log "it is two"

---

installation

It is recommended to use yarn for installation.

yarn add pmfl

or

npm i pmfl --save

---

API

---

Object

pmfl

The object used to create the pmfl instance.

contain

• pmfl.make()
• pmfl.make2()
• pmfl.m()
• pmfl.m2()

---

ignore

An object that can match any value.

contain

• ignore.is_ignore: Boolean

example

import { pmfl, ignore } from 'pmfl'
pmfl.make().add("one",[ignore],(data)=>{console.log("it is ignore")})
.add("two",[2],(data)=>{console.log("it is two")})
.neither((data)=>{"it is neither"})
.match([100])
//log "it is ignore"

---

type

The object used for type matching.

contain

• type.boolean: String
• type.number: String
• type.string: String
• type.function: String
• type.array: String
• type.date: String
• type.regexp: String
• type.object: String
• type.error: String
• type.symbol: String
• type.null: String
• type.undefined: String
• type.of(data)

example

import { pmfl, type } from 'pmfl'
pmfl.make().add("string",[type.string],(data)=>{console.log("it is string")})
.add("array",[type.array],(data)=>{console.log("it is array")})
.neither((data)=>{"it is neither"})
.match([type.of("str")])
//log "it is string"

---

pmfl_object

One of the instance objects of pmfl is the return value of the pmfl.make() function.

contain

• pmfl_object.add(key, condition, func)
• pmfl_object.neither(func)
• pmfl_object.remove(key)
• pmfl_object.clear()
• pmfl_object.load(...rest)
• pmfl_object.unload(...rest)
• pmfl_object.match(args, other_args)

---

pmfl_object2

Another instance of 'pmfl' is the return value of the pmfl.make2() function. Unlike pmfl_object, the matching data for this object cannot be removed.

contain

• pmfl_object2.add(condition, func)
• pmfl_object2.neither(func)
• pmfl_object2.clear()
• pmfl_object2.load(...rest)
• pmfl_object2.match(args,other_args)

---

method

pmfl.make()

Call this function to return the instance object pmfl_object of pmfl.

return：pmfl_object

---

pmfl.m()

Short for pmfl.make().

return：pmfl_object

---

pmfl.make2()

Call this function to return the instance object pmfl_object2 of pmfl.

return：pmfl_object2

---

pmfl.m2()

Short for pmfl.make2().

return：pmfl_object2

---

pmfl_object.add(key, condition, func)

Add matching names, conditions, and callback functions to the pmfl_object object. Abbreviated as pmfl_object.a(key, condition, func).

parameter

• key: String The name of the data to match.
• condition: Array/Function The conditions for matching data.
• func: Function A callback function that is executed when the matching data succeeds.

return：pmfl_object

---

pmfl_object.neither(func)

The option that is executed when all conditions fail to match. Abbreviated as pmfl_object.n(func).

parameter

• func: Function A callback function that is executed when all conditions do not match.

return：pmfl_object

---

pmfl_object.remove(key)

Remove the matching data that has been added to the pmfl_object object. Abbreviated as pmfl_object.r(key).

parameter

• key: String The name of the matching data that needs to be removed. When key does not exist, remove the neither data.

return：pmfl_object

---

pmfl_object.clear()

Remove all matching data, including neither data. Abbreviated as pmfl_object.c().

return：pmfl_object

---

pmfl_object.load(...rest)

Add matching names, conditions, and callback functions to the pmfl_object object in bulk. Abbreviated as pmfl_object.l(...rest).

parameter

• rest: Array<Array> Each element is an array of arrays. The data of 1, 2, and 3 of each element is the matching name, condition, and callback function added for the pmfl_object object.

return：pmfl_object

---

pmfl_object.unload(...rest)

The matching data that has been added in the pmfl_object object is removed in batches. Abbreviated as pmfl_object.u(...rest).

parameter

• rest: Array<String> Each element of the array is a string and is the name of the matching data to be removed. When the length of the array is 0, it means that the neither data is removed.

return：pmfl_object

---

pmfl_object.match(args, other_args)

Perform a match. Abbreviated as pmfl_object.m(args, other_args).

parameter

• args: Array The actual data that needs to be matched corresponds to the condition parameter of the pmfl_object.add(key, condition, func) function.
• other_args: Any The data of the matching callback function needs to be passed in. If this parameter does not exist, args is passed as a parameter to the matching callback function.

return：pmfl_object

---

Example of using pmfl_object

import { pmfl } from 'pmfl'
pmfl.make().add("one",[1],(data)=>{console.log("it is one")})
.add("two",[2],(data)=>{console.log("it is two")})
.neither((data)=>{"it is neither"})
.match([2])
//log "it is two"
pmfl.make().add("one",[1],(data)=>{console.log("it is one")})
.add("two",[2],(data)=>{console.log("it is two")})
.neither((data)=>{"it is neither"})
.remove("two")
.match([2])
//log "it is neither"
pmfl.make().add("one",[1],(data)=>{console.log("it is one")})
.add("two",[2],(data)=>{console.log("it is two")})
.neither((data)=>{"it is neither"})
.clear()
.match([2])
//no log
pmfl.make().load(
  ["one",[1],(data)=>{console.log("it is one")}],
  ["two",[2],(data)=>{console.log("it is two")}]
).neither((data)=>{"it is neither"})
.match([2])
//log "it is two"
pmfl.make().load(
  ["one",[1],(data)=>{console.log("it is one")}],
  ["two",[2],(data)=>{console.log("it is two")}]
).neither((data)=>{"it is neither"})
.unload("one","two")
.match([2])
//log "it is neither"
pmfl.make().add("one",(data)=>{return data[0]===1},(data)=>{console.log("it is one")})
.add("two",[2],(data)=>{console.log("it is two")})
.neither((data)=>{"it is neither"})
.match([1])
//log "it is one"

---

pmfl_object2.add(condition, func)

Add matching conditions and callback functions to the pmfl_object2 object. Abbreviated as pmfl_object2.a(condition, func).

parameter

• condition: Array/Function The conditions for matching data.
• func: Function The callback function executed after the match is successful.

return：pmfl_object2

---

pmfl_object2.neither(func)

The option that is executed when all conditions fail to match. Abbreviated as pmfl_object2.n(func).

parameter

• func: Function A callback function that is executed when all conditions do not match.

return：pmfl_object2

---

pmfl_object2.clear()

Remove all matching data, including neither data. Abbreviated as pmfl_object2.c().

return：pmfl_object2

---

pmfl_object2.load(...rest)

Add matching conditions and callback functions to the pmfl_object2 object in batches. Abbreviated as pmfl_object2.l(...rest).

parameter

• rest: Array<Array> Each element is an array of arrays. The data of No. 1 and No. 2 of each element are the matching conditions and callback functions added for the pmfl_object2 object.

return：pmfl_object2

---

pmfl_object2.match(args,other_args)

Perform a match. Abbreviated as pmfl_object2.m(args, other_args).

parameter

• args: Array The actual data that needs to be matched corresponds to the condition parameter of the pmfl_object2.add(condition, func) function.
• other_args: Any The data of the matching callback function needs to be passed in. If this parameter does not exist, args is passed as a parameter to the matching callback function.

return：pmfl_object2

---

Example of using pmfl_object2

import { pmfl } from 'pmfl'
pmfl.make2().add([1],(data)=>{console.log("it is one")})
.add([2],(data)=>{console.log("it is two")})
.neither((data)=>{"it is neither"})
.match([2])
//log "it is two"
pmfl.make2().add([1],(data)=>{console.log("it is one")})
.add([2],(data)=>{console.log("it is two")})
.neither((data)=>{"it is neither"})
.clear()
.match([2])
//no log
pmfl.make2().load(
  [[1],(data)=>{console.log("it is one")}],
  [[2],(data)=>{console.log("it is two")}]
).neither((data)=>{"it is neither"})
.match([2])
//log "it is two"
pmfl.make2().add((data)=>{return data[0]===1},(data)=>{console.log("it is one")})
.add([2],(data)=>{console.log("it is two")})
.neither((data)=>{"it is neither"})
.match([1])
//log "it is one"

---

num_set(str)

Used to match mathematical intervals.

parameter

• str: String The mathematical interval representation of the String type. There are 9 ways to represent:

1. closed interval： [1,2] 1<=n<=2
2. Open interval： (1,2) 1<n<2
3. Left closed right open interval： [1,2) 1<=n<2
4. Left open right closed interval： (1,2] 1<n<=2
5. Left closed interval： [1,) 1<=n
6. Left open interval： (1,) 1<n
7. Right closed interval： (,2] n<=2
8. Right open interval： (,2) n<2
9. Unbounded interval： (,) Infinity, can match any object

---

Example used by num_set(str)

import { pmfl, num_set } from 'pmfl'
pmfl.make2().add([num_set("[1,20]")], (data) => { console.log("it is 1~20") })
  .add([num_set("(-20,-5)")], (data) => { console.log("it is -20~-5") })
  .neither((data) => { console.log("it is neither") })
  .match([2])  //log "it is 1~20"
  .match([-20]) //log "it is neither"
  .match([-10]) //log "it is -20~-5"

---

data_set(...args)

Used to match one of multiple data.

parameter

• args: Array<Any> A data set that needs to be matched.

---

Example used by data_set(...args)

import { pmfl, data_set } from 'pmfl'
pmfl.make2().add([data_set(1,2,3,4,5)], (data) => { console.log("it is 1-5 numbers") })
  .add([data_set("1","2")], (data) => { console.log("it is 1 and 2 string") })
  .neither((data) => { console.log("it is neither") })
  .match([2])  //log "it is 1-5 numbers"
  .match(["2"]) //log "it is 1 and 2 string"
  .match([-10]) //log "it is neither"

---

License: MIT