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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | 1x 1x 24x 3x 36x 36x 14x 35x 35x 24x 24x 21x 14x 16x 1x | 'use strict';
const fs = require( 'fs' );
const path = require( 'path' );
/**
* @ignore
* @param {string} name
* @throws {Error} If name cannot be used for a file.
*/
function validateName( name ) {
if (
// Empty
name === '' ||
// Only dots
/^\.+$/.test( name ) ||
// Traversal on different operating systems
/[/?<>\\:*|":]/.test( name )
) {
throw new Error( `Invalid file name: "${name}"` );
}
}
/**
* Represents a directory and an (optional) prefix for files and
* subdirectories created within it.
*
* @class
*/
class Writer {
/**
* The specified directory will be created if needed.
* Any parent directories must exist beforehand.
*
* @param {string} dir File path
* @param {string} prefix
* @throws {Error} If directory can't be created.
*/
constructor( dir, prefix = '' ) {
// Create as needed
try {
fs.accessSync( dir, fs.constants.W_OK );
} catch ( err ) {
fs.mkdirSync( dir );
}
/**
* @private
* @property {string}
*/
this.dir = dir;
/**
* @private
* @property {string}
*/
this.namePrefix = prefix;
}
/**
* Get the file path for a resource in this writer's directory.
*
* @param {string} name File name
* @return {string} File path
*/
getPath( name ) {
const segment = this.namePrefix + name;
validateName( segment );
return path.join( this.dir, segment );
}
/**
* Create a Writer object for the same directory, with
* an added prefix for any files and subdirectories.
*
* @param {string} prefix
* @return {Writer}
*/
prefix( prefix ) {
return new Writer( this.dir, this.namePrefix + prefix );
}
/**
* Create a Writer object for a subdirectory of the current one.
*
* @param {string} name
* @return {Writer}
*/
child( name ) {
return new Writer( this.getPath( name ) );
}
}
module.exports = Writer;
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