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- var parse = require('spdx-expression-parse');
- var correct = require('spdx-correct');
-
- var genericWarning = (
- 'license should be ' +
- 'a valid SPDX license expression (without "LicenseRef"), ' +
- '"UNLICENSED", or ' +
- '"SEE LICENSE IN <filename>"'
- );
-
- var fileReferenceRE = /^SEE LICEN[CS]E IN (.+)$/;
-
- function startsWith(prefix, string) {
- return string.slice(0, prefix.length) === prefix;
- }
-
- function usesLicenseRef(ast) {
- if (ast.hasOwnProperty('license')) {
- var license = ast.license;
- return (
- startsWith('LicenseRef', license) ||
- startsWith('DocumentRef', license)
- );
- } else {
- return (
- usesLicenseRef(ast.left) ||
- usesLicenseRef(ast.right)
- );
- }
- }
-
- module.exports = function(argument) {
- var ast;
-
- try {
- ast = parse(argument);
- } catch (e) {
- var match
- if (
- argument === 'UNLICENSED' ||
- argument === 'UNLICENCED'
- ) {
- return {
- validForOldPackages: true,
- validForNewPackages: true,
- unlicensed: true
- };
- } else if (match = fileReferenceRE.exec(argument)) {
- return {
- validForOldPackages: true,
- validForNewPackages: true,
- inFile: match[1]
- };
- } else {
- var result = {
- validForOldPackages: false,
- validForNewPackages: false,
- warnings: [genericWarning]
- };
- if (argument.trim().length !== 0) {
- var corrected = correct(argument);
- if (corrected) {
- result.warnings.push(
- 'license is similar to the valid expression "' + corrected + '"'
- );
- }
- }
- return result;
- }
- }
-
- if (usesLicenseRef(ast)) {
- return {
- validForNewPackages: false,
- validForOldPackages: false,
- spdx: true,
- warnings: [genericWarning]
- };
- } else {
- return {
- validForNewPackages: true,
- validForOldPackages: true,
- spdx: true
- };
- }
- };
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