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Reworks the two functions traverser and findModulePath into a more readable form.

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This is not the supposed end of these changes, but a first change that
should make future changes easier to reason about.
This commit is contained in:
Anders Conbere 2010-12-04 11:37:35 -08:00 committed by Ryan Dahl
parent 8c6a7b5de4
commit e9c7195471
1 changed files with 43 additions and 33 deletions
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76
src/node.js
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@ -146,46 +146,56 @@
removed('require.registerExtension() removed.' +
' Use require.extensions instead');
// Which files to traverse while finding id? Returns generator function.
function traverser(id, dirs) {
var head = [], inDir = [], dirs = dirs.slice(),
exts = Object.keys(extensions);
return function next() {
var result = head.shift();
if (result) { return result; }
var gen = inDir.shift();
if (gen) { head = gen(); return next(); }
var dir = dirs.shift();
if (dir !== undefined) {
function direct(ext) { return path.join(dir, id + ext); }
function index(ext) { return path.join(dir, id, 'index' + ext); }
inDir = [
function() { return exts.map(direct); },
function() { return exts.map(index); }
];
head = [path.join(dir, id)];
return next();
}
};
}
// given a module name, and a list of paths to test, returns the first
// matching file in the following precedence.
//
// require("a.<ext>")
// -> a.<ext>
//
// require("a")
// -> a
// -> a.<ext>
// -> a/index.<ext>
function findModulePath(request, paths) {
var nextLoc =
traverser(request, request.charAt(0) === '/' ? [''] : paths);
var fs = requireNative('fs'),
exts = Object.keys(extensions);
var fs = requireNative('fs');
paths = request.charAt(0) === '/' ? [''] : paths;
var location, stats;
while (location = nextLoc()) {
try { stats = fs.statSync(location); } catch (e) { continue; }
if (stats && !stats.isDirectory()) return location;
// check if the file exists and is not a directory
var tryFile = function(requestPath) {
try {
stats = fs.statSync(requestPath);
if (stats && !stats.isDirectory()) {
return requestPath;
}
} catch (e) {}
return false;
};
// given a path check a the file exists with any of the set extensions
var tryExtensions = function(p, extension) {
for (var i = 0, EL = exts.length; i < EL; i++) {
f = tryFile(p + exts[i]);
if (f) { return f; }
}
return false;
};
// For each path
for (var i = 0, PL = paths.length; i < PL; i++) {
var p = paths[i],
// try to join the request to the path
f = tryFile(path.join(p, request)) ||
// try it with each of the extensions
tryExtensions(path.join(p, request)) ||
// try it with each of the extensions at "index"
tryExtensions(path.join(p, request, 'index'));
if (f) { return f; }
}
return false;
}
// sync - no i/o performed
function resolveModuleLookupPaths(request, parent) {