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/**
* GNU LibreJS - A browser add-on to block nonfree nontrivial JavaScript.
* *
* Copyright (C) 2018 Nathan Nichols
* Copyright (C) 2022 Yuchen Pei
*
* This file is part of GNU LibreJS.
*
* GNU LibreJS is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GNU LibreJS is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU LibreJS. If not, see <http://www.gnu.org/licenses/>.
*/
const { licenses } = require('./license_definitions.js');
const { patternUtils } = require('./pattern_utils.js');
const LIC_RE = /@licstartThefollowingistheentirelicensenoticefortheJavaScriptcodeinthis(?:page|file)(.*)?@licendTheaboveistheentirelicensenoticefortheJavaScriptcodeinthis(?:page|file)/mi;
/**
* stripLicenseToRegexp
*
* Removes all non-alphanumeric characters except for the
* special tokens, and replace the text values that are
* hardcoded in license_definitions.js
*
*/
const stripLicenseToRegexp = function(license) {
for (const frag of license.licenseFragments) {
frag.regex = patternUtils.removeNonalpha(frag.text);
frag.regex = new RegExp(
patternUtils.replaceTokens(frag.regex), '');
}
};
const init = function() {
console.log('initializing regexes');
for (const key in licenses) {
stripLicenseToRegexp(licenses[key]);
}
}
module.exports.init = init;
/**
*
* Takes in the declaration that has been preprocessed and
* tests it against regexes in our table.
*/
const searchTable = function(strippedComment) {
const stripped = patternUtils.removeNonalpha(strippedComment);
// looking up license
for (const key in licenses) {
const license = licenses[key];
for (const frag of license.licenseFragments) {
if (frag.regex.test(stripped)) {
return license.licenseName;
}
}
}
console.log('No global license found.');
return null;
}
/**
* Checks whether licenseText, modulo whitespace, starts with
* a @licstart / @licend with a free license, returns the license name
* if so, and null otherwise.
*/
const check = function(licenseText) {
if (licenseText === undefined || licenseText === null) {
return null;
}
// remove whitespace
const stripped = patternUtils.removeWhitespace(licenseText);
// Search for @licstart/@licend
const matches = stripped.match(LIC_RE);
return matches && searchTable(matches[0]);
};
module.exports.check = check;
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