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126 lines
3.1 KiB
126 lines
3.1 KiB
4 years ago
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'use strict';
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const fs = require('fs');
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const CoaObject = require('./coaobject');
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/**
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* COA Parameter
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*
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* Base class for options and arguments
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*
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* --------|-----|-----|-----
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* | Cmd | Opt | Arg
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* --------|-----|-----|-----
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* arr | | ✓ | ✓
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* req | | ✓ | ✓
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* val | | ✓ | ✓
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* def | | ✓ | ✓
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* input | | ✓ | ✓
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* output | | ✓ | ✓
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*
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* @class CoaParam
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* @extends CoaObject
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*/
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module.exports = class CoaParam extends CoaObject {
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constructor(cmd) {
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super(cmd);
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this._arr = false;
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this._req = false;
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this._val = undefined;
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this._def = undefined;
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}
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/**
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* Makes a param accepts multiple values.
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* Otherwise, the value will be used by the latter passed.
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*
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* @returns {COA.CoaParam} - this instance (for chainability)
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*/
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arr() {
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this._arr = true;
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return this;
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}
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/**
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* Makes a param required.
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*
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* @returns {COA.CoaParam} - this instance (for chainability)
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*/
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req() {
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this._req = true;
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return this;
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}
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/**
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* Set a validation (or value) function for param.
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* Value from command line passes through before becoming available from API.
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* Using for validation and convertion simple types to any values.
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*
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* @param {Function} val - validating function,
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* invoked in the context of option instance
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* and has one parameter with value from command line.
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* @returns {COA.CoaParam} - this instance (for chainability)
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*/
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val(val) {
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this._val = val;
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return this;
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}
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/**
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* Set a default value for param.
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* Default value passed through validation function as ordinary value.
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*
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* @param {*} def - default value of function generator
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* @returns {COA.CoaParam} - this instance (for chainability)
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*/
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def(def) {
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this._def = def;
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return this;
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}
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/**
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* Make option value inputting stream.
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* It's add useful validation and shortcut for STDIN.
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*
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* @returns {COA.CoaParam} - this instance (for chainability)
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*/
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input() {
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process.stdin.pause();
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return this
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.def(process.stdin)
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.val(function(v) {
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if(typeof v !== 'string')
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return v;
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if(v === '-')
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return process.stdin;
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const s = fs.createReadStream(v, { encoding : 'utf8' });
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s.pause();
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return s;
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});
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}
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/**
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* Make option value outputing stream.
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* It's add useful validation and shortcut for STDOUT.
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*
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* @returns {COA.CoaParam} - this instance (for chainability)
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*/
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output() {
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return this
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.def(process.stdout)
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.val(function(v) {
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if(typeof v !== 'string')
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return v;
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if(v === '-')
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return process.stdout;
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return fs.createWriteStream(v, { encoding : 'utf8' });
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});
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}
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};
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