git ssb

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'use strict';
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var assert = require('assert');
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var path = require('path');
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exports.STORE_BLOB = 0;
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exports.STORE_CONTENT = 1;
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exports.STORE_LINKS = 2;
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exports.STORE_STAT = 3;
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exports.ALIAS_AS_RELATIVE = 0;   // require("./file.js") // file or directory
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exports.ALIAS_AS_RESOLVABLE = 1; // require("package")
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var win32 = process.platform === 'win32';
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var hasURL = typeof URL !== 'undefined';
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function uppercaseDriveLetter (f) {
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  if (f.slice(1, 3) !== ':\\') return f;
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  return f[0].toUpperCase() + f.slice(1);
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}
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function removeTrailingSlashes (f) {
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  if (f === '/') {
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    return f; // dont remove from "/"
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  }
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  if (f.slice(1) === ':\\') {
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    return f; // dont remove from "D:\"
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  }
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  var last = f.length - 1;
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  while (true) {
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    var char = f.charAt(last);
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    if (char === '\\') {
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      f = f.slice(0, -1);
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      last -= 1;
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    } else
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    if (char === '/') {
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      f = f.slice(0, -1);
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      last -= 1;
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    } else {
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      break;
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    }
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  }
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  return f;
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}
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function isRootPath (p) {
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  if (Buffer.isBuffer(p)) p = p.toString();
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  if (hasURL && p instanceof URL) p = p.pathname;
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  if (p === '.') p = path.resolve(p);
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  return path.dirname(p) === p;
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}
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exports.isRootPath = isRootPath;
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var normalizePath;
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if (win32) {
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  normalizePath = function (f) {
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    var file = f;
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    if (Buffer.isBuffer(file)) file = file.toString();
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    if (hasURL && file instanceof URL) file = file.pathname.replace(/^\//, '');
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    if (!(/^.:$/.test(file))) file = path.normalize(file); // 'c:' -> 'c:.'
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    file = uppercaseDriveLetter(file);
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    file = removeTrailingSlashes(file);
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    return file;
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  };
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} else {
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  normalizePath = function (f) {
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    var file = f;
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    if (Buffer.isBuffer(file)) file = file.toString();
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    if (hasURL && file instanceof URL) file = file.pathname;
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    if (!(/^.:$/.test(file))) file = path.normalize(file); // 'c:' -> 'c:.'
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    file = removeTrailingSlashes(file);
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    return file;
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  };
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}
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exports.normalizePath = normalizePath;
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exports.isPackageJson = function (file) {
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  return path.basename(file) === 'package.json';
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};
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exports.isDotJS = function (file) {
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  return path.extname(file) === '.js';
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};
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exports.isDotJSON = function (file) {
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  return path.extname(file) === '.json';
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};
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exports.isDotNODE = function (file) {
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  return path.extname(file) === '.node';
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};
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function replaceSlashes (file, slash) {
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  if (/^.:\\/.test(file)) {
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    if (slash === '/') {
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      return file.slice(2).replace(/\\/g, '/');
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    }
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  } else
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  if (/^\//.test(file)) {
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    if (slash === '\\') {
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      return 'C:' + file.replace(/\//g, '\\');
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    }
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  }
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  return file;
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}
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function injectSnapshot (file) {
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  if (/^.:\\/.test(file)) {
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    // C:\path\to
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    if (file.length === 3) file = file.slice(0, -1); // C:\
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    return file[0] + ':\\snapshot' + file.slice(2);
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  } else
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  if (/^\//.test(file)) {
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    // /home/user/project
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    if (file.length === 1) file = file.slice(0, -1); // /
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    return '/snapshot' + file;
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  }
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  return file;
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}
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function longestCommonLength (s1, s2) {
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  var length = Math.min(s1.length, s2.length);
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  for (var i = 0; i < length; i += 1) {
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    if (s1.charCodeAt(i) !== s2.charCodeAt(i)) {
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      return i;
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    }
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  }
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  return length;
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}
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function withoutNodeModules (file) {
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  return file.split(path.sep + 'node_modules' + path.sep)[0];
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}
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exports.retrieveDenominator = function (files) {
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  assert(files.length > 0);
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  var s1 = withoutNodeModules(files[0]) + path.sep;
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  for (var i = 1; i < files.length; i += 1) {
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    var s2 = withoutNodeModules(files[i]) + path.sep;
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    s1 = s1.slice(0, longestCommonLength(s1, s2));
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  }
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  if (s1 === '') return win32 ? 2 : 0;
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  return s1.lastIndexOf(path.sep);
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};
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exports.substituteDenominator = function (f, denominator) {
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  var rootLength = win32 ? 2 : 0;
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  return f.slice(0, rootLength) + f.slice(denominator);
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};
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exports.snapshotify = function (file, slash) {
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  assert.equal(file, normalizePath(file));
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  return injectSnapshot(replaceSlashes(file, slash));
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};
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if (win32) {
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  exports.insideSnapshot = function insideSnapshot (f) {
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    if (Buffer.isBuffer(f)) f = f.toString();
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    if (hasURL && f instanceof URL) f = f.pathname.replace(/^\//, '');
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    if (typeof f !== 'string') return false;
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    var slice112 = f.slice(1, 12);
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    if (slice112 === ':\\snapshot\\' ||
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        slice112 === ':/snapshot\\' ||
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        slice112 === ':\\snapshot/' ||
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        slice112 === ':/snapshot/' ||
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        slice112 === ':\\snapshot' ||
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        slice112 === ':/snapshot') return true;
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    return false;
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  };
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} else {
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  exports.insideSnapshot = function insideSnapshot (f) {
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    if (Buffer.isBuffer(f)) f = f.toString();
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    if (hasURL && f instanceof URL) f = f.pathname;
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    if (typeof f !== 'string') return false;
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    var slice010 = f.slice(0, 10);
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    if (slice010 === '/snapshot/' ||
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        slice010 === '/snapshot') return true;
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    return false;
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  };
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}
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exports.stripSnapshot = function (f) {
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  var file = normalizePath(f);
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  if (/^.:\\snapshot$/.test(file)) {
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    return file[0] + ':\\**\\';
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  }
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  if (/^.:\\snapshot\\/.test(file)) {
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    return file[0] + ':\\**' + file.slice(11);
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  }
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  if (/^\/snapshot$/.test(file)) {
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    return '/**/';
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  }
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  if (/^\/snapshot\//.test(file)) {
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    return '/**' + file.slice(9);
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  }
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  return f; // not inside
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};
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if (win32) {
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  exports.removeUplevels = function removeUplevels (f) {
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    while (true) {
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      if (f.slice(0, 3) === '..\\') {
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        f = f.slice(3);
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      } else
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      if (f === '..') {
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        f = '.';
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      } else {
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        break;
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      }
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    }
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    return f;
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  };
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} else {
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  exports.removeUplevels = function removeUplevels (f) {
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    while (true) {
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      if (f.slice(0, 3) === '../') {
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        f = f.slice(3);
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      } else
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      if (f === '..') {
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        f = '.';
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      } else {
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        break;
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      }
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    }
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    return f;
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  };
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}
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