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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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