luhn-generator
Version:
A generator of numbers that passes the validation of Luhn algorithm or Luhn formula, also known as the 'modulus 10' or 'mod 10' algorithm
92 lines (91 loc) • 3.68 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var path = require("path");
var path_1 = require("path");
var filesystem_1 = require("./filesystem");
/**
* Builds a list of all physical paths to try by:
* 1. Check for file named exactly as request.
* 2. Check for files named as request ending in any of the extensions.
* 3. Check for file specified in package.json's main property.
* 4. Check for files named as request ending in "index" with any of the extensions.
*/
function getPathsToTry(extensions, absolutePathMappings, requestedModule) {
if (!absolutePathMappings ||
!requestedModule ||
requestedModule[0] === "." ||
requestedModule[0] === path.sep) {
return undefined;
}
var pathsToTry = [];
for (var _i = 0, absolutePathMappings_1 = absolutePathMappings; _i < absolutePathMappings_1.length; _i++) {
var entry = absolutePathMappings_1[_i];
var starMatch = entry.pattern === requestedModule
? ""
: matchStar(entry.pattern, requestedModule);
if (starMatch !== undefined) {
var _loop_1 = function (physicalPathPattern) {
var physicalPath = physicalPathPattern.replace("*", starMatch);
pathsToTry.push({ type: "file", path: physicalPath });
pathsToTry.push.apply(pathsToTry, extensions.map(function (e) { return ({ type: "extension", path: physicalPath + e }); }));
pathsToTry.push({
type: "package",
path: path.join(physicalPath, "/package.json")
});
var indexPath = path.join(physicalPath, "/index");
pathsToTry.push.apply(pathsToTry, extensions.map(function (e) { return ({ type: "index", path: indexPath + e }); }));
};
for (var _a = 0, _b = entry.paths; _a < _b.length; _a++) {
var physicalPathPattern = _b[_a];
_loop_1(physicalPathPattern);
}
}
}
return pathsToTry.length === 0 ? undefined : pathsToTry;
}
exports.getPathsToTry = getPathsToTry;
// Not sure why we don't just return the full found path?
function getStrippedPath(tryPath) {
return tryPath.type === "index"
? path_1.dirname(tryPath.path)
: tryPath.type === "file"
? tryPath.path
: tryPath.type === "extension"
? filesystem_1.removeExtension(tryPath.path)
: tryPath.type === "package"
? tryPath.path
: exhaustiveTypeException(tryPath.type);
}
exports.getStrippedPath = getStrippedPath;
function exhaustiveTypeException(check) {
throw new Error("Unknown type " + check);
}
exports.exhaustiveTypeException = exhaustiveTypeException;
/**
* Matches pattern with a single star against search.
* Star must match at least one character to be considered a match.
* @param patttern for example "foo*"
* @param search for example "fooawesomebar"
* @returns the part of search that * matches, or undefined if no match.
*/
function matchStar(pattern, search) {
if (search.length < pattern.length) {
return undefined;
}
if (pattern === "*") {
return search;
}
var star = pattern.indexOf("*");
if (star === -1) {
return undefined;
}
var part1 = pattern.substring(0, star);
var part2 = pattern.substring(star + 1);
if (search.substr(0, star) !== part1) {
return undefined;
}
if (search.substr(search.length - part2.length) !== part2) {
return undefined;
}
return search.substr(star, search.length - part2.length);
}