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 <a href="../../index.html">All files</a> / <a href="index.html">coa/lib</a> coaparam.js
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 51.61% 
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 16/31
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 0% 
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 0/8
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 55.56% 
 Functions
 5/9
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 51.61% 
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 16/31
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&nbsp;</td><td class="text"><pre class="prettyprint lang-js">'use strict';
&nbsp;
const fs = require('fs');
&nbsp;
const CoaObject = require('./coaobject');
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/**
 * COA Parameter
 *
 * Base class for options and arguments
 *
 * --------|-----|-----|-----
 * | Cmd | Opt | Arg
 * --------|-----|-----|-----
 * arr | | ✓ | ✓
 * req | | ✓ | ✓
 * val | | ✓ | ✓
 * def | | ✓ | ✓
 * input | | ✓ | ✓
 * output | | ✓ | ✓
 *
 * @class CoaParam
 * @extends CoaObject
 */
module.exports = class CoaParam extends CoaObject {
 constructor(cmd) {
 super(cmd);
&nbsp;
 this._arr = false;
 this._req = false;
 this._val = undefined;
 this._def = undefined;
 }
&nbsp;
 /**
 * Makes a param accepts multiple values.
 * Otherwise, the value will be used by the latter passed.
 *
 * @returns {COA.CoaParam} - this instance (for chainability)
 */
 arr() {
 this._arr = true;
 return this;
 }
&nbsp;
 /**
 * Makes a param required.
 *
 * @returns {COA.CoaParam} - this instance (for chainability)
 */
 req() {
 this._req = true;
 return this;
 }
&nbsp;
 /**
 * Set a validation (or value) function for param.
 * Value from command line passes through before becoming available from API.
 * Using for validation and convertion simple types to any values.
 *
 * @param {Function} val - validating function,
 * invoked in the context of option instance
 * and has one parameter with value from command line.
 * @returns {COA.CoaParam} - this instance (for chainability)
 */
 val(val) {
 this._val = val;
 return this;
 }
&nbsp;
 /**
 * Set a default value for param.
 * Default value passed through validation function as ordinary value.
 *
 * @param {*} def - default value of function generator
 * @returns {COA.CoaParam} - this instance (for chainability)
 */
 def(def) {
 this._def = def;
 return this;
 }
&nbsp;
 /**
 * Make option value inputting stream.
 * It's add useful validation and shortcut for STDIN.
 *
 * @returns {COA.CoaParam} - this instance (for chainability)
 */
 input() {
 process.stdin.pause();
 return this
 .def(process.stdin)
 .val(function(v) {
 if(typeof v !== 'string')
 return v;
&nbsp;
 if(v === '-')
 return process.stdin;
&nbsp;
 const s = fs.createReadStream(v, { encoding : 'utf8' });
 s.pause();
 return s;
 });
 }
&nbsp;
 /**
 * Make option value outputing stream.
 * It's add useful validation and shortcut for STDOUT.
 *
 * @returns {COA.CoaParam} - this instance (for chainability)
 */
 output() {
 return this
 .def(process.stdout)
 .val(function(v) {
 if(typeof v !== 'string')
 return v;
&nbsp;
 if(v === '-')
 return process.stdout;
&nbsp;
 return fs.createWriteStream(v, { encoding : 'utf8' });
 });
 }
};
&nbsp;</pre></td></tr>
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 Code coverage
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