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program.js
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program.js
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var API = require("./api"),
UTIL = API.UTIL,
FILE = API.FILE,
DEBUG = API.DEBUG,
DESCRIPTORS = require("./descriptors");
var Program = exports.Program = function(descriptor)
{
this.descriptor = descriptor;
}
Program.prototype.discoverPackages = function(fetcher, callback)
{
DEBUG.print("Boot packages:");
var di = DEBUG.indent() + 1;
var cbt = new UTIL.CallbackTracker(callback);
var self = this;
self.descriptor.walkBoot(function(id)
{
DEBUG.indent(di).print("ID: " + id).indent(di+1);
fetcher(self.descriptor.locatorForId(id), cbt.add(function(pkg)
{
// This should only happen if locator points to a provider
// if(!pkg)
// return;
DEBUG.indent(di+1).print("Path: \0cyan(" + pkg.path + "\0)");
if (pkg.discovering)
{
DEBUG.indent(di+1).print("... skip second pass ...");
return;
}
pkg.discoverMappings(fetcher, cbt.add());
}));
});
cbt.done();
}
Program.prototype.getProviderPackages = function()
{
var self = this,
packages = {};
self.descriptor.walkPackages(function(id, info)
{
if (typeof info.provider != "undefined")
{
packages[id] = info;
}
});
return packages;
}
Program.prototype.getEngines = function()
{
if (typeof this.descriptor.json.engine == "undefined")
return false;
return this.descriptor.json.engine;
}
Program.prototype.getBootPackages = function()
{
var self = this,
dependencies = [],
i = 0;
self.descriptor.walkBoot(function(id)
{
var dep = {};
dep["_package-" + i] = self.descriptor.locatorForId(id);
dependencies.push(dep);
i++;
});
return dependencies;
}
/**
* Given any mappings locator return an absolute path location-based locator.
*/
Program.prototype.resolveLocator = function(assembler, locator, callback, options)
{
var self = this;
var descriptor = locator.descriptor;
function finalize(locator)
{
// Make sure location path is always absolute and clean
if (typeof locator.location != "undefined")
{
if (locator.location.charAt(0) == "/")
locator.location = FILE.realpath(locator.location) + "/";
}
if ((typeof locator.available == "undefined" || locator.available === true) && typeof locator.provider == "undefined")
{
// If we do not have an absolute path location-based locator by now we cannot proceed
if (typeof locator.location == "undefined" || locator.location.charAt(0) != "/")
throw new Error("Resolved locator is not absolute path location-based: " + UTIL.locatorToString(locator));
// If locator specifies a path we add it to the location.
// This is typically needed to get the paths to packages in a multi-package archive
if (typeof locator.path != "undefined")
locator.location = API.FILE.realpath(locator.location + "/" + locator.path) + "/";
// Pass through the original descriptor unchanged
if (typeof descriptor != "undefined")
locator.descriptor = descriptor;
}
callback(locator);
}
if (typeof locator.archive != "undefined")
{
var m;
if (m = locator.archive.match(/^jar:(https?):\/\/([^!]*)!\/(.*?)(\/?)$/))
{
locator.id = m[2];
locator.archive = m[1] + "://" + m[2];
// Check if we are referring to a module that should be mapped to the alias
if (/\.js$/.test(m[3]) && !m[4])
{
locator.module = "/" + m[3];
}
else
locator.path = m[3]
locator = this.descriptor.augmentLocator(locator, options);
}
else
if (m = locator.archive.match(/^https?:\/\/(.*)$/))
{
if (typeof locator.id == "undefined")
locator.id = m[1];
}
else
throw new Error("Invalid archive URL: "+ locator.archive);
assembler.downloader.getForArchive(locator.archive, function(path)
{
locator.location = path + "/";
finalize(locator);
});
return;
}
else
if (typeof locator.catalog != "undefined")
{
locator = this.descriptor.augmentLocator(locator, options);
// Only query catalog if program descriptor does not already set a location for the
// package referenced by the locator.
if (typeof locator.location == "undefined")
{
assembler.downloader.getCatalogForURL(locator.catalog, function(path)
{
var catalogDescriptor = new DESCRIPTORS.Catalog(path);
locator = catalogDescriptor.packageLocatorForLocator(locator);
// NOTE: locator now contains an 'archive' property
if (typeof locator.archive == "undefined")
throw new Error("Unable to resolve catalog-based locator.");
self.resolveLocator(assembler, locator, callback);
});
return;
}
}
else
if (typeof locator.id != "undefined")
{
locator = this.descriptor.augmentLocator(locator, options);
if (typeof locator.location == "undefined" &&
(typeof locator.archive != "undefined" || typeof locator.catalog != "undefined"))
{
this.resolveLocator(assembler, locator, finalize, options);
return;
}
}
else
if (typeof locator.location != "undefined")
{
// do nothing for now
}
else
if (typeof locator.available != "undefined")
{
// do nothing for now
}
else
throw new Error("NYI - " + UTIL.locatorToString(locator));
finalize(locator);
}