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* @license Apache-2.0
*
* Copyright (c) 2019 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var resolve = require( 'path' ).resolve;
var statSync = require( 'fs' ).statSync; // TODO: replace with stdlib equivalent
var logger = require( 'debug' );
var readDir = require( '@stdlib/fs/read-dir' ).sync;
var startsWith = require( '@stdlib/string/starts-with' );
var extname = require( '@stdlib/utils/extname' );
var cwd = require( '@stdlib/process/cwd' );
var indexRegExp = require( './regexp_index.js' ); // eslint-disable-line stdlib/no-require-index
var relativePathRegExp = require( './regexp_relative_require_path.js' );
var pathRegExp = require( './regexp_path.js' );
var contains = require( './contains.js' );
// VARIABLES //
var debug = logger( 'repl:completer:require' );
var RE_RELATIVE = relativePathRegExp();
// MAIN //
/**
* Completes a `require` expression.
*
* @private
* @param {Array} out - output array for storing completions
* @param {string} path - path to complete
* @param {Array} paths - module search paths
* @param {Array} exts - supported `require` extensions
* @returns {string} path filter
*/
function complete( out, path, paths, exts ) {
var filter;
var sfiles;
var subdir;
var files;
var stats;
var dir;
var ext;
var re;
var f;
var i;
var j;
var k;
if ( path === '.' ) {
out.push( './', '../' );
return '.';
}
if ( path === '..' ) {
out.push( '../' );
return '..';
}
debug( 'Searching for completion candidates...' );
if ( RE_RELATIVE.test( path ) ) {
debug( 'Detected a relative require path. Resolving from current working directory...' );
paths = [ cwd() ];
} else {
debug( 'Detected a package name. Resolving from known module paths...' );
}
// Split the path to complete into two components: subdirectory path and filter...
subdir = path.match( pathRegExp() );
filter = subdir[ 2 ];
subdir = subdir[ 1 ] || '';
// Compile a regular expression for matching an `index` file:
re = indexRegExp( exts );
// For each search path, attempt to resolve a matching package and/or file...
debug( 'Searching paths: %s', paths.join( ', ' ) );
for ( i = 0; i < paths.length; i++ ) {
// Resolve the subdirectory path to a file system path:
dir = resolve( paths[ i ], subdir );
debug( 'Resolved directory: %s', dir );
debug( 'Reading directory contents...' );
files = readDir( dir );
if ( files instanceof Error ) {
debug( 'Unable to read directory: %s. Error: %s', dir, files.message );
continue;
}
for ( j = 0; j < files.length; j++ ) {
f = files[ j ];
if ( !startsWith( f, filter ) ) {
debug( '%s does not match filter %s. Skipping...', f, filter );
continue;
}
f = resolve( dir, f );
debug( 'Examining path: %s', f );
try {
stats = statSync( f );
if ( stats.isDirectory() ) {
debug( 'Path resolves to a subdirectory.' );
out.push( files[ j ] + '/' );
debug( 'Found a completion: %s', out[ out.length-1 ] );
debug( 'Reading subdirectory contents...' );
sfiles = readDir( f );
if ( sfiles instanceof Error ) {
debug( 'Unable to read subdirectory: %s. Error: %s', f, sfiles.message );
continue;
}
for ( k = 0; k < sfiles.length; k++ ) {
if ( re.test( sfiles[ k ] ) ) { // eslint-disable-line max-depth
// Since the subdirectory contains an `index` file, one can simply "require" the subdirectory, thus eliding the full file path:
debug( 'Subdirectory contains an `index` file.' );
out.push( files[ j ] );
debug( 'Found a completion: %s', out[ out.length-1 ] );
} else if ( sfiles[ k ] === 'package.json' ) {
// Since the subdirectory contains a `package.json` file, we **ASSUME** one can simply "require" the subdirectory, thus eliding the full file path (WARNING: we do NOT explicitly check that the main entry point actually exists!):
debug( 'Subdirectory contains a `package.json` file.' );
out.push( files[ j ] );
debug( 'Found a completion: %s', out[ out.length-1 ] );
}
}
} else if ( stats.isFile() ) {
debug( 'Path resolves to a file.' );
ext = extname( files[ j ] );
if ( contains( exts.length, exts, 1, 0, ext ) ) {
debug( 'File has supported extension: %s', ext );
out.push( files[ j ] );
debug( 'Found a completion: %s', out[ out.length-1 ] );
}
} else {
debug( 'Path resolves to neither a directory nor a file. Skipping path...' );
continue;
}
} catch ( err ) {
debug( 'Error: %s', err.message );
debug( 'Skipping path...' );
continue;
}
}
}
return filter;
}
// EXPORTS //
module.exports = complete;
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