graphene/docs/playground/graphene-js/pypyjs.js

984 lines
32 KiB
JavaScript

//
// pypyjs: an experimental in-browser python environment.
//
(function() {
// Expose the main pypyjs function at global scope for this file,
// as well as in any module exports or 'window' object we can find.
if (this) {
this.pypyjs = pypyjs;
}
if (typeof window !== "undefined") {
window.pypyjs = pypyjs;
}
if (typeof module !== "undefined") {
if (typeof module.exports !== "undefined") {
module.exports = pypyjs;
}
}
// Generic debugging printf.
var debug = function(){};
if (typeof console !== "undefined") {
debug = console.log.bind(console);
} else if (typeof print !== "undefined" && typeof window === "undefined") {
debug = print;
}
// Find the directory containing this very file.
// It can be quite difficult depending on execution environment...
if (typeof __dirname === "undefined" || true) {
var __dirname = "./";
// A little hackery to find the URL of this very file.
// Throw an error, then parse the stack trace looking for filenames.
var errlines = (new Error()).stack.split("\n");
for (var i = 0; i < errlines.length; i++) {
var match = /(at Anonymous function \(|at |@)(.+\/)pypyjs.js/.exec(errlines[i]);
if (match) {
__dirname = match[2];
break;
}
}
}
if (__dirname.charAt(__dirname.length - 1) !== "/") {
__dirname += "/";
}
if (typeof Promise === "undefined") {
var Promise = require('es6-promise').Promise;
}
// Ensure we have reference to a 'FunctionPromise' constructor.
var FunctionPromise = require("./FunctionPromise.js");
if (typeof FunctionPromise === "undefined") {
throw "FunctionPromise object not found";
}
// Some extra goodies for nodejs.
if (typeof process !== 'undefined') {
if (Object.prototype.toString.call(process) === '[object process]') {
var fs = require("fs");
var path = require("path");
}
}
// Create functions for handling default stdio streams.
// These will be shared by all VM instances by default.
//
// We default stdout and stderr to process outputs if available,
// printing/logging functions otherwise, and /dev/null if nothing
// else is available. Unfortunately there's no good way to read
// synchronously from stdin in javascript, so that's always /dev/null.
var devNull = {
stdin: function() { return null; },
stdout: function() { },
stderr: function() { }
}
var stdio = {
stdin: null,
stdout: null,
stderr: null
}
stdio.stdin = devNull.stdin;
if (typeof process !== "undefined") {
if (typeof process.stdout !== "undefined") {
stdio.stdout = function(x) { process.stdout.write(x); }
}
if (typeof process.stderr !== "undefined") {
stdio.stderr = function(x) { process.stderr.write(x); }
}
}
var _print, _printErr;
if (typeof window === "undefined") {
// print, printErr from v8, spidermonkey
if (typeof print !== "undefined") {
_print = print;
}
if (typeof printErr !== "undefined") {
_printErr = printErr;
}
}
if (typeof console !== "undefined") {
if (typeof _print === "undefined") {
_print = console.log.bind(console);
}
if (typeof _printErr === "undefined") {
_printErr = console.error.bind(console);
}
}
if (stdio.stdout == null && typeof _print !== "undefined") {
// print()/console.log() will add a newline, so we buffer until we
// receive one and then let it add it for us.
stdio.stdout = (function() {
var buffer = [];
return function(data) {
for (var i = 0; i < data.length; i++) {
var x = data.charAt(i);
if (x !== "\n") {
buffer.push(x);
} else {
_print(buffer.join(""));
buffer.splice(undefined, buffer.length);
}
}
}
})();
}
if (stdio.stderr == null && typeof _printErr !== "undefined") {
// printErr()/console.error() will add a newline, so we buffer until we
// receive one and then let it add it for us.
stdio.stderr = (function() {
var buffer = [];
return function(data) {
for (var i = 0; i < data.length; i++) {
var x = data.charAt(i);
if (x !== "\n") {
buffer.push(x);
} else {
_printErr(buffer.join(""));
buffer.splice(undefined, buffer.length);
}
}
}
})();
}
if (stdio.stdout === null) {
stdio.stdout = devNull.stdout;
}
if (stdio.stderr === null) {
stdio.stderr = devNull.stderr;
}
function pypyjs(opts) {
opts = opts || {};
this.rootURL = opts.rootURL;
this.totalMemory = opts.totalMemory || 128 * 1024 * 1024;
this.autoLoadModules = opts.autoLoadModules || true;
this._pendingModules = {};
this._loadedModules = {};
this._allModules = {};
// Allow opts to override default IO streams.
this.stdin = opts.stdin || stdio.stdin;
this.stdout = opts.stdout || stdio.stdout;
this.stderr = opts.stderr || stdio.stderr;
// Default to finding files relative to this very file.
if (!this.rootURL && !pypyjs.rootURL) {
pypyjs.rootURL = __dirname;
}
if (this.rootURL && this.rootURL.charAt(this.rootURL.length - 1) !== "/") {
this.rootURL += "/";
}
// If we haven't already done so, fetch and load the code for the VM.
// We do this once and cache the result for re-use, so that we don't
// have to pay asmjs compilation overhead each time we create the VM.
if (! pypyjs._vmBuilderPromise) {
pypyjs._vmBuilderPromise = this.fetch("pypyjs.vm.js").then((function(xhr) {
// Parse the compiled code, hopefully asynchronously.
// Unfortunately our use of Function constructor here doesn't
// play very well with nodejs, where things like 'module' and
// 'require' are not in the global scope. We have to pass them
// in explicitly as arguments.
var funcBody = [
// This is the compiled code for the VM.
xhr.responseText,
'\n',
// Ensure that some functions are available on the Module,
// for linking with jitted code.
'if (!Module._jitInvoke && typeof _jitInvoke !== "undefined") {',
' Module._jitInvoke = _jitInvoke;',
'}',
// Keep some functions that are not exported by default, but
// which appear in this scope when evaluating the above.
"Module._emjs_make_handle = _emjs_make_handle;",
"Module._emjs_free = _emjs_free;",
// Call dependenciesFulfilled if it won't be done automatically.
"dependenciesFulfilled=function() { inDependenciesFulfilled(FS); };",
"if(!memoryInitializer||(!ENVIRONMENT_IS_WEB&&!ENVIRONMENT_IS_WORKER))dependenciesFulfilled();",
].join("");
return FunctionPromise("Module", "inDependenciesFulfilled", "require",
"module", "__filename", "__dirname", funcBody)
}).bind(this));
}
// Create a new instance of the compiled VM, bound to local state
// and a local Module object.
this._ready = new Promise((function(resolve, reject) {
// Initialize the Module object.
// We make it available on this object so that we can use
// its methods to execute code in the VM.
var Module = {};
this._module = Module;
Module.TOTAL_MEMORY = this.totalMemory;
// We will set up the filesystem manually when we're ready.
Module.noFSInit = true;
Module.thisProgram = "/lib/pypyjs/pypyjs.js";
Module.filePackagePrefixURL = this.rootURL || pypyjs.rootURL;
Module.memoryInitializerPrefixURL = this.rootURL || pypyjs.rootURL;
Module.locateFile = function(name) {
return (this.rootURL || pypyjs.rootURL) + name;
}
// Don't start or stop the program, just set it up.
// We'll call the API functions ourself.
Module.noInitialRun = true;
Module.noExitRuntime = true;
// Route stdin to an overridable method on the object.
var stdin = (function stdin() {
return this.stdin();
}).bind(this);
// Route stdout to an overridable method on the object.
// We buffer the output for efficiency.
var stdout_buffer = []
var stdout = (function stdout(x) {
var c = String.fromCharCode(x);
stdout_buffer.push(c);
if (c === "\n" || stdout_buffer.length >= 128) {
this.stdout(stdout_buffer.join(""));
stdout_buffer = [];
}
}).bind(this);
// Route stderr to an overridable method on the object.
// We do not buffer stderr.
var stderr = (function stderr(x) {
var c = String.fromCharCode(x);
this.stderr(c);
}).bind(this);
// This is where execution will continue after loading
// the memory initialization data, if any.
var initializedResolve, initializedReject;
var initializedP = new Promise(function(resolve, reject) {
initializedResolve = resolve;
initializedReject = reject;
});
var FS;
var dependenciesFulfilled = function(fs) {
FS = fs;
// Initialize the filesystem state.
try {
FS.init(stdin, stdout, stderr);
Module.FS_createPath("/", "lib/pypyjs/lib_pypy", true, false);
Module.FS_createPath("/", "lib/pypyjs/lib-python/2.7", true, false);
initializedResolve();
} catch (err) {
initializedReject(err);
}
}
// Begin fetching the metadata for available python modules.
// With luck these can download while we jank around compiling
// all of that javascript.
// XXX TODO: also load memory initializer this way.
var moduleDataP = this.fetch("modules/index.json");
pypyjs._vmBuilderPromise.then((function(vmBuilder) {
var args = [
Module,
dependenciesFulfilled,
typeof undefined,
typeof undefined,
typeof undefined,
typeof __dirname
];
// This links the async-compiled module into our Module object.
vmBuilder.apply(null, args);
return initializedP;
}).bind(this)).then((function() {
// Continue with processing the downloaded module metadata.
return moduleDataP.then((function(xhr) {
// Store the module index, and load any preload modules.
var modIndex = JSON.parse(xhr.responseText);
this._allModules = modIndex.modules;
if (modIndex.preload) {
for (var name in modIndex.preload) {
this._writeModuleFile(name, modIndex.preload[name]);
}
}
// It's finally safe to launch the VM.
Module.run();
Module._rpython_startup_code();
var pypy_home = Module.intArrayFromString("/lib/pypyjs/pypyjs.js");
pypy_home = Module.allocate(pypy_home, 'i8', Module.ALLOC_NORMAL);
Module._pypy_setup_home(pypy_home, 0);
Module._free(pypy_home);
var initCode = [
"import js",
"import sys; sys.platform = 'js'",
"import traceback",
"top_level_scope = {'__name__': '__main__'}"
];
initCode.forEach(function(codeStr) {
var code = Module.intArrayFromString(codeStr);
var code = Module.allocate(code, 'i8', Module.ALLOC_NORMAL);
if (!code) {
throw new pypyjs.Error('Failed to allocate memory');
}
var res = Module._pypy_execute_source(code);
if (res < 0) {
throw new pypyjs.Error('Failed to execute python code');
}
Module._free(code);
});
}).bind(this))
}).bind(this))
.then(resolve, reject);
}).bind(this));
};
// A simple file-fetching wrapper around XMLHttpRequest,
// that treats paths as relative to the pypyjs.js root url.
//
pypyjs.prototype.fetch = function (relpath, responseType) {
if (typeof window === "undefined") {
var localStorage = false;
}
else {
var localStorage = window.localStorage;
}
var use_cache = pypyjs.cacheKey && localStorage && relpath != "pypyjs.vm.js";
if (use_cache) {
var item = localStorage.getItem(pypyjs.cacheKey+':'+relpath);
if (item) {
return new Promise((function(resolve, reject) {
resolve({ responseText: item });
}))
}
}
// For the web, use XMLHttpRequest.
if (typeof XMLHttpRequest !== "undefined") {
return new Promise((function(resolve, reject) {
var xhr = new XMLHttpRequest();
xhr.onload = function() {
if (xhr.status >= 400) {
reject(xhr)
} else {
if (use_cache && xhr.responseText) {
localStorage.setItem(pypyjs.cacheKey+':'+relpath, xhr.responseText);
}
resolve(xhr);
}
};
var rootURL = this.rootURL || pypyjs.rootURL;
xhr.open('GET', rootURL + relpath, true);
xhr.responseType = responseType || "text";
xhr.send(null);
}).bind(this));
}
// For nodejs, use fs.readFile.
if (typeof fs !== "undefined" && typeof fs.readFile !== "undefined") {
return new Promise((function(resolve, reject) {
var rootURL = this.rootURL || pypyjs.rootURL;
fs.readFile(path.join(rootURL, relpath), function(err, data) {
if (err) return reject(err);
resolve({ responseText: data.toString() });
});
}).bind(this));
}
// For spidermonkey, use snarf (which has a binary read mode).
if (typeof snarf !== "undefined") {
return new Promise((function(resolve, reject) {
var rootURL = this.rootURL || pypyjs.rootURL;
var data = snarf(rootURL + relpath);
resolve({ responseText: data });
}).bind(this));
}
// For d8, use read() and readbuffer().
if (typeof read !== "undefined" && typeof readbuffer !== "undefined") {
return new Promise((function(resolve, reject) {
var rootURL = this.rootURL || pypyjs.rootURL;
var data = read(rootURL + relpath);
resolve({ responseText: data });
}).bind(this));
}
return new Promise(function(resolve, reject) {
reject("unable to fetch files");
});
};
if (typeof localStorage !== "undefined") {
var localStorage = false;
}
// pypyjs.prototype.fetch = function fetch(relpath, responseType) {
// // For the web, use XMLHttpRequest.
// var use_cache = pypyjs.cacheKey && localStorage;
// if (use_cache) {
// if (var item = localStorage.getItem(pypyjs.cacheKey+'-'+relpath)) {
// resolve({ responseText: item });
// }
// }
// if (typeof XMLHttpRequest !== "undefined") {
// return new Promise((function(resolve, reject) {
// var xhr = new XMLHttpRequest();
// xhr.onload = function() {
// if (xhr.status >= 400) {
// reject(xhr)
// } else {
// console.log(xhr.responseText);
// if (use_cache && xhr.responseText) {
// localStorage.setItem(pypyjs.cacheKey+'-'+relpath, xhr.responseText);
// }
// resolve(xhr);
// }
// };
// var rootURL = this.rootURL || pypyjs.rootURL;
// xhr.open('GET', rootURL + relpath, true);
// xhr.responseType = responseType || "text";
// xhr.send(null);
// }).bind(this));
// }
// // For nodejs, use fs.readFile.
// if (typeof fs !== "undefined" && typeof fs.readFile !== "undefined") {
// return new Promise((function(resolve, reject) {
// var rootURL = this.rootURL || pypyjs.rootURL;
// fs.readFile(path.join(rootURL, relpath), function(err, data) {
// if (err) return reject(err);
// resolve({ responseText: data.toString() });
// });
// }).bind(this));
// }
// // For spidermonkey, use snarf (which has a binary read mode).
// if (typeof snarf !== "undefined") {
// return new Promise((function(resolve, reject) {
// var rootURL = this.rootURL || pypyjs.rootURL;
// var data = snarf(rootURL + relpath);
// resolve({ responseText: data });
// }).bind(this));
// }
// // For d8, use read() and readbuffer().
// if (typeof read !== "undefined" && typeof readbuffer !== "undefined") {
// return new Promise((function(resolve, reject) {
// var rootURL = this.rootURL || pypyjs.rootURL;
// var data = read(rootURL + relpath);
// resolve({ responseText: data });
// }).bind(this));
// }
// return new Promise(function(resolve, reject) {
// reject("unable to fetch files");
// });
// };
// Method to execute python source directly in the VM.
//
// This is the basic way to push code into the pypyjs VM.
// Calling code should not use it directly; rather we use it
// as a primitive to build up a nicer execution API.
//
pypyjs.prototype._execute_source = function _execute_source(code) {
var Module = this._module;
code = "try:\n" +
" " + code + "\n" +
"except Exception:\n" +
" typ, val, tb = sys.exc_info()\n" +
" err_name = getattr(typ, '__name__', str(typ))\n" +
" err_msg = str(val)\n" +
" err_trace = traceback.format_exception(typ, val, tb)\n" +
" err_trace = ''.join(err_trace)\n" +
" js.globals['pypyjs']._lastErrorName = err_name\n" +
" js.globals['pypyjs']._lastErrorMessage = err_msg\n" +
" js.globals['pypyjs']._lastErrorTrace = err_trace\n";
var code_chars = Module.intArrayFromString(code);
var code_ptr = Module.allocate(code_chars, 'i8', Module.ALLOC_NORMAL);
if (!code_ptr) {
return Promise.reject(new pypyjs.Error("Failed to allocate memory"));
}
var res = Module._pypy_execute_source(code_ptr);
Module._free(code_ptr);
// XXX TODO: races/re-entrancy on _lastError?
if (pypyjs._lastErrorName) {
var err = new pypyjs.Error(
pypyjs._lastErrorName,
pypyjs._lastErrorMessage,
pypyjs._lastErrorTrace
);
pypyjs._lastErrorName = null;
pypyjs._lastErrorMessage = null;
pypyjs._lastErrorTrace = null;
return Promise.reject(err);
}
if (res < 0) {
return Promise.reject(new pypyjs.Error("Error executing python code"));
}
return Promise.resolve(null);
}
function _escape(value) {
return value.replace(/\\/g, "\\\\").replace(/'/g, "\\'");
}
// Method to determine when the interpreter is ready.
//
// This method returns a promise that will resolve once the interpreter
// is ready for use.
//
pypyjs.prototype.ready = function ready() {
return this._ready;
}
// Method to execute some python code.
//
// This passes the given python code to the VM for execution.
// It's fairly directly analogous to the "exec" statement in python.
// It is not possible to directly access the result of the code, if any.
// Rather you should store it into a variable and then use the get() method.
//
pypyjs.prototype.exec = function exec(code) {
return this._ready.then((function() {
var p = Promise.resolve();
// Find any "import" statements in the code,
// and ensure the modules are ready for loading.
if (this.autoLoadModules) {
p = p.then((function() {
return this.findImportedNames(code);
}).bind(this))
.then((function(imports) {
return this.loadModuleData.apply(this, imports);
}).bind(this))
}
// Now we can execute the code in custom top-level scope.
code = 'exec \'\'\'' + _escape(code) + '\'\'\' in top_level_scope';
p = p.then((function() {
return this._execute_source(code);
}).bind(this));
return p;
}).bind(this));
}
// Method to evaluate an expression.
//
// This method evaluates an expression and returns its value (assuming the
// value can be translated into javascript). It's fairly directly analogous
// to the "eval" function in python.
//
// For backwards-compatibility reasons, it will also evaluate statements.
// This behaviour is deprecated and will be removed in a future release.
//
pypyjs.prototype.eval = function (expr) {
return this._ready.then((function() {
// First try to execute it as an expression.
code = "r = eval('" + _escape(expr) + "', top_level_scope)";
return this._execute_source(code);
}).bind(this)).then(
(function() {
// If that succeeded, return the result.
return this.get("r", true)
}).bind(this),
(function(err) {
if (err && err.name && err.name !== "SyntaxError") {
throw err;
}
// If that failed, try again via exec().
if (typeof console !== "undefined") {
console.warn("Calling pypyjs.eval() with statements is deprecated.");
console.warn("Use eval() for expressions, exec() for statements.");
}
return this.exec(expr);
}).bind(this)
)
}
// Method to evaluate some python code from a file..
//
// This fetches the named file and passes it to the VM for execution.
//
pypyjs.prototype.execfile = function execfile(filename) {
return this.fetch(filename).then((function(xhr) {
var code = xhr.responseText;
return this.exec(code);
}).bind(this));
}
// Method to read a python variable.
//
// This tries to convert the value in the named python variable into an
// equivalent javascript value and returns it. It will fail if the variable
// does not exist or contains a value that cannot be converted.
//
pypyjs._resultsID = 0;
pypyjs._resultsMap = {};
pypyjs.prototype.get = function get(name, _fromGlobals) {
var resid = ""+(pypyjs._resultsID++);
// We can read from global scope for internal use; don't do this from calling code!
if (_fromGlobals) {
var namespace = "globals()";
} else {
var namespace = "top_level_scope";
}
return this._ready.then((function() {
var code = namespace + ".get('" + _escape(name) + "', js.undefined)";
code = "js.convert(" + code + ")"
code = "js.globals['pypyjs']._resultsMap['" + resid + "'] = " + code;
return this._execute_source(code);
}).bind(this)).then((function() {
var res = pypyjs._resultsMap[resid];
delete pypyjs._resultsMap[resid];
return res;
}).bind(this));
}
// Method to set a python variable to a javascript value.
//
// This generates a handle to the given object, and arranges for the named
// python variable to reference it via that handle.
//
pypyjs.prototype.set = function set(name, value) {
return this._ready.then((function() {
var Module = this._module;
var h = Module._emjs_make_handle(value);
name = _escape(name);
var code = "top_level_scope['" + name + "'] = js.Value(" + h + ")";
return this._execute_source(code);
}).bind(this));
}
// Method to run an interactive REPL.
//
// This method takes takes callback function implementing the user
// input prompt, and runs a REPL loop using it. The prompt function
// may either return the input as a string, or a promise resolving to
// the input as a string. If not specified, we read from stdin (which
// works fine in e.g. nodejs, but is almost certainly not what you want
// in the browser, because it's blocking).
//
pypyjs.prototype.repl = function repl(prmpt) {
if (!prmpt) {
// If there's a custom stdin, or we're not in nodejs, then we should
// default to prompting on stdin/stdout. For nodejs, we can build
// an async prompt atop process.stdin.
var buffer = "";
if (this.stdin !== devNull.stdin || typeof process === "undefined") {
prmpt = (function(ps1) {
var input;
this.stdout(ps1);
var c = this.stdin();
while (c) {
var idx = c.indexOf("\n");
if (idx >= 0) {
var input = buffer + c.substr(0, idx + 1);
buffer = c.substr(idx + 1);
return input;
}
buffer += c;
c = this.stdin();
}
input = buffer;
buffer = "";
return input;
}).bind(this);
} else {
prmpt = (function(ps1) {
return new Promise((function(resolve, reject) {
this.stdout(ps1);
var slurp = function() {
process.stdin.once("readable", function() {
var chunk = process.stdin.read();
if (chunk === null) {
slurp();
} else {
chunk = chunk.toString();
var idx = chunk.indexOf("\n");
if (idx < 0) {
buffer += chunk;
slurp();
} else {
resolve(buffer + chunk.substr(0, idx + 1));
buffer = chunk.substr(idx + 1);
}
}
});
}
slurp();
}).bind(this));
}).bind(this);
}
}
// Set up an InteractiveConsole instance,
// then loop forever via recursive promises.
return this._ready.then((function() {
return this.loadModuleData("code");
}).bind(this)).then((function() {
return this._execute_source("import code");
}).bind(this)).then((function() {
return this._execute_source("c = code.InteractiveConsole(top_level_scope)");
}).bind(this)).then((function() {
return this._repl_loop(prmpt, ">>> ");
}).bind(this));
}
pypyjs.prototype._repl_loop = function _repl_loop(prmpt, ps1) {
return Promise.resolve().then((function() {
// Prompt for input, which may happen via async promise.
return prmpt.call(this, ps1);
}).bind(this)).then((function(input) {
// Push it into the InteractiveConsole, a line at a time.
var p = Promise.resolve();
input.split("\n").forEach((function(line) {
// Find any "import" statements in the code,
// and ensure the modules are ready for loading.
if (this.autoLoadModules) {
p = p.then((function() {
return this.findImportedNames(line);
}).bind(this))
.then((function(imports) {
return this.loadModuleData.apply(this, imports);
}).bind(this))
}
var code = 'r = c.push(\'' + _escape(line) + '\')';
p = p.then((function() {
return this._execute_source(code);
}).bind(this));
}).bind(this));
return p;
}).bind(this)).then((function() {
// Check the result from the final push.
return this.get("r", true)
}).bind(this)).then((function(r) {
// If r == 1, we're in a multi-line definition.
// Adjust the prompt accordingly.
if (r) {
return this._repl_loop(prmpt, "... ");
} else {
return this._repl_loop(prmpt, ">>> ");
}
}).bind(this));
}
// Method to look for "import" statements in a code string.
// Returns a promise that will resolve to a list of imported module names.
//
// XXX TODO: this is far from complete and should not be done with a regex.
// Perhaps we can call into python's "ast" module for this parsing?
//
var importStatementRE = /(from\s+([a-zA-Z0-9_\.]+)\s+)?import\s+\(?\s*([a-zA-Z0-9_\.\*]+(\s+as\s+[a-zA-Z0-9_]+)?[ \t]*,?[ \t]*)+[ \t]*\)?/g
pypyjs.prototype.findImportedNames = function findImportedNames(code) {
var match = null;
var imports = [];
importStatementRE.lastIndex = 0;
while ((match = importStatementRE.exec(code)) !== null) {
var relmod = match[2];
if (relmod) {
relmod = relmod + ".";
} else {
relmod = "";
}
var submods = match[0].split("import")[1];
while (submods && /[\s(]/.test(submods.charAt(0))) {
submods = submods.substr(1);
}
while (submods && /[\s)]/.test(submods.charAt(submods.length - 1))) {
submods = submods.substr(0, submods.length - 1);
}
submods = submods.split(/\s*,\s*/);
for (var i = 0; i < submods.length; i++) {
var submod = submods[i];
submod = submod.split(/\s*as\s*/)[0];
imports.push(relmod + submod);
}
}
return Promise.resolve(imports);
}
// Method to load the contents of a python module, along with
// any dependencies. This populates the relevant paths within
// the VMs simulated filesystem so that is can find and import
// the specified module.
//
pypyjs.prototype.loadModuleData = function loadModuleData(/* names */) {
// Each argument is a name that we want to import.
// We must find the longest prefix that is an available module
// and load it along with all its dependencies.
var modules = Array.prototype.slice.call(arguments);
return this._ready.then((function() {
var toLoad = {};
NEXTNAME: for (var i = 0; i < modules.length; i++) {
var name = modules[i];
// Find the nearest containing module for the given name.
// Note that it may not match a module at all, in which case we ignore it.
while (true) {
if (this._allModules[name]) {
break;
}
name = name.substr(0, name.lastIndexOf("."));
if (!name) continue NEXTNAME;
}
this._findModuleDeps(name, toLoad);
}
// Now ensure that each module gets loaded.
// XXX TODO: we could load these concurrently.
var p = Promise.resolve();
for (var name in toLoad) {
p = p.then(this._makeLoadModuleData(name));
}
return p;
}).bind(this));
}
pypyjs.prototype._findModuleDeps = function _findModuleDeps(name, seen) {
if (!seen) seen = {};
var deps = [];
// If we don't know about this module, ignore it.
if (!this._allModules[name]) {
return seen;
}
// Depend on any explicitly-named imports.
var imports = this._allModules[name].imports;
if (imports) {
for (var i = 0; i < imports.length; i++) {
deps.push(imports[i]);
}
}
// Depend on the __init__.py for packages.
if (this._allModules[name].dir) {
deps.push(name + ".__init__");
}
// Include the parent package, if any.
var idx = name.lastIndexOf(".");
if (idx !== -1) {
deps.push(name.substr(0, idx));
}
// Recurse for any previously-unseen dependencies.
seen[name] = true;
for (var i = 0; i < deps.length; i++) {
if (!seen[deps[i]]) {
this._findModuleDeps(deps[i], seen);
}
}
return seen;
}
pypyjs.prototype._makeLoadModuleData = function _makeLoadModuleData(name) {
return (function() {
// If we've already loaded this module, we're done.
if (this._loadedModules[name]) {
return Promise.resolve();
}
// If we're already in the process of loading it, use the existing promise.
if (this._pendingModules[name]) {
return this._pendingModules[name];
}
// If it's a package directory, there's not actually anything to do.
if (this._allModules[name].dir) {
return Promise.resolve();
}
// We need to fetch the module file and write it out.
var modfile = this._allModules[name].file;
var p = this.fetch("modules/" + modfile)
.then((function(xhr) {
var contents = xhr.responseText;
this._writeModuleFile(name, contents)
delete this._pendingModules[name];
}).bind(this))
this._pendingModules[name] = p;
return p;
}).bind(this);
}
pypyjs.prototype._writeModuleFile = function _writeModuleFile(name, data) {
var Module = this._module;
var file = this._allModules[name].file;
// Create the containing directory first.
var dir = file.split("/").slice(0, -1).join("/")
try {
Module.FS_createPath("/lib/pypyjs/lib_pypy", dir, true, false);
} catch (e) { }
// Now we can safely create the file.
var fullpath = "/lib/pypyjs/lib_pypy/" + file;
Module.FS_createDataFile(fullpath, "", data, true, false, true);
this._loadedModules[name] = true;
}
// An error class for reporting python exceptions back to calling code.
// XXX TODO: this could be a lot more user-friendly than a opaque error...
pypyjs.Error = function pypyjsError(name, message, trace) {
if (name && typeof message === "undefined") {
message = name;
name = "";
}
this.name = name || "pypyjs.Error";
this.message = message || "pypyjs Unknown Error";
this.trace = trace || "";
}
pypyjs.Error.prototype = new Error();
pypyjs.Error.prototype.constructor = pypyjs.Error;
// XXX TODO: expose the filesystem for manipulation by calling code.
// Add convenience methods directly on the 'pypyjs' function, that
// will invoke corresponding methods on a default VM instance.
// This makes it look like 'pypyjs' is a singleton VM instance.
pypyjs._defaultVM = null;
pypyjs.stdin = stdio.stdin
pypyjs.stdout = stdio.stdout
pypyjs.stderr = stdio.stderr
var PUBLIC_NAMES = ['ready', 'exec', 'eval', 'execfile', 'get', 'set',
'repl', 'loadModuleData'];
PUBLIC_NAMES.forEach(function(name) {
pypyjs[name] = function() {
if (!pypyjs._defaultVM) {
pypyjs._defaultVM = new pypyjs({
stdin: function(){ return pypyjs.stdin.apply(this, arguments); },
stdout: function(){ return pypyjs.stdout.apply(this, arguments); },
stderr: function(){ return pypyjs.stderr.apply(this, arguments); },
});
}
return pypyjs._defaultVM[name].apply(pypyjs._defaultVM, arguments)
}
})
// For nodejs, run a repl when invoked directly from the command-line.
return pypyjs;
})();