Function computeCommonSourceDirectoryOfFilenames

test/fixtures/snapshot/typescript.js:115734–115770

(fileNames, currentDirectory, getCanonicalFileName)

    ts.resolveTripleslashReference = resolveTripleslashReference;
    /* @internal */
    function computeCommonSourceDirectoryOfFilenames(fileNames, currentDirectory, getCanonicalFileName) {
        var commonPathComponents;
        var failed = ts.forEach(fileNames, function (sourceFile) {
            // Each file contributes into common source file path
            var sourcePathComponents = ts.getNormalizedPathComponents(sourceFile, currentDirectory);
            sourcePathComponents.pop(); // The base file name is not part of the common directory path
            if (!commonPathComponents) {
                // first file
                commonPathComponents = sourcePathComponents;
                return;
            }
            var n = Math.min(commonPathComponents.length, sourcePathComponents.length);
            for (var i = 0; i < n; i++) {
                if (getCanonicalFileName(commonPathComponents[i]) !== getCanonicalFileName(sourcePathComponents[i])) {
                    if (i === 0) {
                        // Failed to find any common path component
                        return true;
                    }
                    // New common path found that is 0 -> i-1
                    commonPathComponents.length = i;
                    break;
                }
            }
            // If the sourcePathComponents was shorter than the commonPathComponents, truncate to the sourcePathComponents
            if (sourcePathComponents.length < commonPathComponents.length) {
                commonPathComponents.length = sourcePathComponents.length;
            }
        });
        // A common path can not be found when paths span multiple drives on windows, for example
        if (failed) {
            return "";
        }
        if (!commonPathComponents) { // Can happen when all input files are .d.ts files
            return currentDirectory;
        }
        return ts.getPathFromPathComponents(commonPathComponents);
    }
    ts.computeCommonSourceDirectoryOfFilenames = computeCommonSourceDirectoryOfFilenames;
    function createCompilerHost(options, setParentNodes) {
        return createCompilerHostWorker(options, setParentNodes);