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588 lines
20 KiB
588 lines
20 KiB
// Type description parser
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//
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// Type description JSON files (such as ecma5.json and browser.json)
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// are used to
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//
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// A) describe types that come from native code
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//
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// B) to cheaply load the types for big libraries, or libraries that
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// can't be inferred well
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(function(mod) {
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if (typeof exports == "object" && typeof module == "object") // CommonJS
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return exports.init = mod;
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if (typeof define == "function" && define.amd) // AMD
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return define({init: mod});
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tern.def = {init: mod};
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})(function(exports, infer) {
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"use strict";
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function hop(obj, prop) {
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return Object.prototype.hasOwnProperty.call(obj, prop);
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}
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var TypeParser = exports.TypeParser = function(spec, start, base, forceNew) {
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this.pos = start || 0;
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this.spec = spec;
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this.base = base;
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this.forceNew = forceNew;
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};
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function unwrapType(type, self, args) {
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return type.call ? type(self, args) : type;
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}
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function extractProp(type, prop) {
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if (prop == "!ret") {
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if (type.retval) return type.retval;
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var rv = new infer.AVal;
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type.propagate(new infer.IsCallee(infer.ANull, [], null, rv));
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return rv;
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} else {
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return type.getProp(prop);
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}
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}
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function computedFunc(args, retType) {
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return function(self, cArgs) {
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var realArgs = [];
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for (var i = 0; i < args.length; i++) realArgs.push(unwrapType(args[i], self, cArgs));
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return new infer.Fn(name, infer.ANull, realArgs, unwrapType(retType, self, cArgs));
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};
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}
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function computedUnion(types) {
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return function(self, args) {
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var union = new infer.AVal;
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for (var i = 0; i < types.length; i++) unwrapType(types[i], self, args).propagate(union);
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return union;
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};
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}
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function computedArray(inner) {
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return function(self, args) {
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return new infer.Arr(inner(self, args));
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};
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}
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TypeParser.prototype = {
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eat: function(str) {
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if (str.length == 1 ? this.spec.charAt(this.pos) == str : this.spec.indexOf(str, this.pos) == this.pos) {
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this.pos += str.length;
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return true;
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}
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},
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word: function(re) {
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var word = "", ch, re = re || /[\w$]/;
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while ((ch = this.spec.charAt(this.pos)) && re.test(ch)) { word += ch; ++this.pos; }
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return word;
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},
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error: function() {
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throw new Error("Unrecognized type spec: " + this.spec + " (at " + this.pos + ")");
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},
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parseFnType: function(comp, name, top) {
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var args = [], names = [], computed = false;
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if (!this.eat(")")) for (var i = 0; ; ++i) {
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var colon = this.spec.indexOf(": ", this.pos), argname;
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if (colon != -1) {
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argname = this.spec.slice(this.pos, colon);
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if (/^[$\w?]+$/.test(argname))
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this.pos = colon + 2;
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else
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argname = null;
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}
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names.push(argname);
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var argType = this.parseType(comp);
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if (argType.call) computed = true;
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args.push(argType);
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if (!this.eat(", ")) {
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this.eat(")") || this.error();
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break;
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}
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}
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var retType, computeRet, computeRetStart, fn;
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if (this.eat(" -> ")) {
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var retStart = this.pos;
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retType = this.parseType(true);
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if (retType.call) {
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if (top) {
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computeRet = retType;
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retType = infer.ANull;
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computeRetStart = retStart;
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} else {
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computed = true;
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}
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}
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} else {
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retType = infer.ANull;
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}
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if (computed) return computedFunc(args, retType);
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if (top && (fn = this.base))
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infer.Fn.call(this.base, name, infer.ANull, args, names, retType);
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else
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fn = new infer.Fn(name, infer.ANull, args, names, retType);
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if (computeRet) fn.computeRet = computeRet;
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if (computeRetStart != null) fn.computeRetSource = this.spec.slice(computeRetStart, this.pos);
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return fn;
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},
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parseType: function(comp, name, top) {
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var main = this.parseTypeMaybeProp(comp, name, top);
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if (!this.eat("|")) return main;
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var types = [main], computed = main.call;
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for (;;) {
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var next = this.parseTypeMaybeProp(comp, name, top);
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types.push(next);
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if (next.call) computed = true;
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if (!this.eat("|")) break;
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}
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if (computed) return computedUnion(types);
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var union = new infer.AVal;
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for (var i = 0; i < types.length; i++) types[i].propagate(union);
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return union;
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},
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parseTypeMaybeProp: function(comp, name, top) {
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var result = this.parseTypeInner(comp, name, top);
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while (comp && this.eat(".")) result = this.extendWithProp(result);
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return result;
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},
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extendWithProp: function(base) {
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var propName = this.word(/[\w<>$!]/) || this.error();
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if (base.apply) return function(self, args) {
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return extractProp(base(self, args), propName);
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};
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return extractProp(base, propName);
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},
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parseTypeInner: function(comp, name, top) {
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if (this.eat("fn(")) {
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return this.parseFnType(comp, name, top);
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} else if (this.eat("[")) {
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var inner = this.parseType(comp);
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this.eat("]") || this.error();
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if (inner.call) return computedArray(inner);
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if (top && this.base) {
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infer.Arr.call(this.base, inner);
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return this.base;
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}
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return new infer.Arr(inner);
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} else if (this.eat("+")) {
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var path = this.word(/[\w$<>\.!]/);
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var base = parsePath(path + ".prototype");
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if (!(base instanceof infer.Obj)) base = parsePath(path);
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if (!(base instanceof infer.Obj)) return base;
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if (comp && this.eat("[")) return this.parsePoly(base);
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if (top && this.forceNew) return new infer.Obj(base);
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return infer.getInstance(base);
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} else if (comp && this.eat("!")) {
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var arg = this.word(/\d/);
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if (arg) {
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arg = Number(arg);
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return function(_self, args) {return args[arg] || infer.ANull;};
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} else if (this.eat("this")) {
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return function(self) {return self;};
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} else if (this.eat("custom:")) {
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var fname = this.word(/[\w$]/);
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return customFunctions[fname] || function() { return infer.ANull; };
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} else {
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return this.fromWord("!" + this.word(/[\w$<>\.!]/));
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}
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} else if (this.eat("?")) {
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return infer.ANull;
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} else {
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return this.fromWord(this.word(/[\w$<>\.!`]/));
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}
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},
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fromWord: function(spec) {
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var cx = infer.cx();
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switch (spec) {
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case "number": return cx.num;
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case "string": return cx.str;
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case "bool": return cx.bool;
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case "<top>": return cx.topScope;
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}
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if (cx.localDefs && spec in cx.localDefs) return cx.localDefs[spec];
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return parsePath(spec);
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},
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parsePoly: function(base) {
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var propName = "<i>", match;
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if (match = this.spec.slice(this.pos).match(/^\s*(\w+)\s*=\s*/)) {
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propName = match[1];
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this.pos += match[0].length;
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}
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var value = this.parseType(true);
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if (!this.eat("]")) this.error();
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if (value.call) return function(self, args) {
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var instance = infer.getInstance(base);
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value(self, args).propagate(instance.defProp(propName));
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return instance;
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};
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var instance = infer.getInstance(base);
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value.propagate(instance.defProp(propName));
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return instance;
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}
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};
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function parseType(spec, name, base, forceNew) {
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var type = new TypeParser(spec, null, base, forceNew).parseType(false, name, true);
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if (/^fn\(/.test(spec)) for (var i = 0; i < type.args.length; ++i) (function(i) {
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var arg = type.args[i];
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if (arg instanceof infer.Fn && arg.args && arg.args.length) addEffect(type, function(_self, fArgs) {
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var fArg = fArgs[i];
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if (fArg) fArg.propagate(new infer.IsCallee(infer.cx().topScope, arg.args, null, infer.ANull));
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});
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})(i);
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return type;
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}
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function addEffect(fn, handler, replaceRet) {
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var oldCmp = fn.computeRet, rv = fn.retval;
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fn.computeRet = function(self, args, argNodes) {
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var handled = handler(self, args, argNodes);
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var old = oldCmp ? oldCmp(self, args, argNodes) : rv;
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return replaceRet ? handled : old;
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};
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}
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var parseEffect = exports.parseEffect = function(effect, fn) {
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var m;
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if (effect.indexOf("propagate ") == 0) {
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var p = new TypeParser(effect, 10);
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var origin = p.parseType(true);
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if (!p.eat(" ")) p.error();
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var target = p.parseType(true);
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addEffect(fn, function(self, args) {
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unwrapType(origin, self, args).propagate(unwrapType(target, self, args));
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});
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} else if (effect.indexOf("call ") == 0) {
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var andRet = effect.indexOf("and return ", 5) == 5;
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var p = new TypeParser(effect, andRet ? 16 : 5);
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var getCallee = p.parseType(true), getSelf = null, getArgs = [];
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if (p.eat(" this=")) getSelf = p.parseType(true);
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while (p.eat(" ")) getArgs.push(p.parseType(true));
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addEffect(fn, function(self, args) {
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var callee = unwrapType(getCallee, self, args);
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var slf = getSelf ? unwrapType(getSelf, self, args) : infer.ANull, as = [];
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for (var i = 0; i < getArgs.length; ++i) as.push(unwrapType(getArgs[i], self, args));
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var result = andRet ? new infer.AVal : infer.ANull;
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callee.propagate(new infer.IsCallee(slf, as, null, result));
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return result;
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}, andRet);
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} else if (m = effect.match(/^custom (\S+)\s*(.*)/)) {
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var customFunc = customFunctions[m[1]];
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if (customFunc) addEffect(fn, m[2] ? customFunc(m[2]) : customFunc);
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} else if (effect.indexOf("copy ") == 0) {
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var p = new TypeParser(effect, 5);
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var getFrom = p.parseType(true);
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p.eat(" ");
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var getTo = p.parseType(true);
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addEffect(fn, function(self, args) {
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var from = unwrapType(getFrom, self, args), to = unwrapType(getTo, self, args);
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from.forAllProps(function(prop, val, local) {
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if (local && prop != "<i>")
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to.propagate(new infer.PropHasSubset(prop, val));
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});
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});
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} else {
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throw new Error("Unknown effect type: " + effect);
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}
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};
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var currentTopScope;
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var parsePath = exports.parsePath = function(path, scope) {
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var cx = infer.cx(), cached = cx.paths[path], origPath = path;
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if (cached != null) return cached;
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cx.paths[path] = infer.ANull;
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var base = scope || currentTopScope || cx.topScope;
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if (cx.localDefs) for (var name in cx.localDefs) {
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if (path.indexOf(name) == 0) {
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if (path == name) return cx.paths[path] = cx.localDefs[path];
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if (path.charAt(name.length) == ".") {
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base = cx.localDefs[name];
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path = path.slice(name.length + 1);
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break;
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}
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}
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}
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var parts = path.split(".");
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for (var i = 0; i < parts.length && base != infer.ANull; ++i) {
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var prop = parts[i];
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if (prop.charAt(0) == "!") {
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if (prop == "!proto") {
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base = (base instanceof infer.Obj && base.proto) || infer.ANull;
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} else {
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var fn = base.getFunctionType();
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if (!fn) {
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base = infer.ANull;
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} else if (prop == "!ret") {
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base = fn.retval && fn.retval.getType(false) || infer.ANull;
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} else {
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var arg = fn.args && fn.args[Number(prop.slice(1))];
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base = (arg && arg.getType(false)) || infer.ANull;
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}
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}
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} else if (base instanceof infer.Obj) {
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var propVal = (prop == "prototype" && base instanceof infer.Fn) ? base.getProp(prop) : base.props[prop];
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if (!propVal || propVal.isEmpty())
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base = infer.ANull;
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else
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base = propVal.types[0];
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}
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}
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// Uncomment this to get feedback on your poorly written .json files
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// if (base == infer.ANull) console.error("bad path: " + origPath + " (" + cx.curOrigin + ")");
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cx.paths[origPath] = base == infer.ANull ? null : base;
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return base;
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};
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function emptyObj(ctor) {
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var empty = Object.create(ctor.prototype);
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empty.props = Object.create(null);
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empty.isShell = true;
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return empty;
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}
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function isSimpleAnnotation(spec) {
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if (!spec["!type"] || /^(fn\(|\[)/.test(spec["!type"])) return false;
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for (var prop in spec)
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if (prop != "!type" && prop != "!doc" && prop != "!url" && prop != "!span" && prop != "!data")
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return false;
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return true;
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}
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function passOne(base, spec, path) {
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if (!base) {
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var tp = spec["!type"];
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if (tp) {
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if (/^fn\(/.test(tp)) base = emptyObj(infer.Fn);
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else if (tp.charAt(0) == "[") base = emptyObj(infer.Arr);
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else throw new Error("Invalid !type spec: " + tp);
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} else if (spec["!stdProto"]) {
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base = infer.cx().protos[spec["!stdProto"]];
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} else {
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base = emptyObj(infer.Obj);
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}
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base.name = path;
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}
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for (var name in spec) if (hop(spec, name) && name.charCodeAt(0) != 33) {
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var inner = spec[name];
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if (typeof inner == "string" || isSimpleAnnotation(inner)) continue;
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var prop = base.defProp(name);
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passOne(prop.getObjType(), inner, path ? path + "." + name : name).propagate(prop);
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}
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return base;
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}
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function passTwo(base, spec, path) {
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if (base.isShell) {
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delete base.isShell;
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var tp = spec["!type"];
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if (tp) {
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parseType(tp, path, base);
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} else {
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var proto = spec["!proto"] && parseType(spec["!proto"]);
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infer.Obj.call(base, proto instanceof infer.Obj ? proto : true, path);
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}
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}
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var effects = spec["!effects"];
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if (effects && base instanceof infer.Fn) for (var i = 0; i < effects.length; ++i)
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parseEffect(effects[i], base);
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copyInfo(spec, base);
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for (var name in spec) if (hop(spec, name) && name.charCodeAt(0) != 33) {
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var inner = spec[name], known = base.defProp(name), innerPath = path ? path + "." + name : name;
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if (typeof inner == "string") {
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if (known.isEmpty()) parseType(inner, innerPath).propagate(known);
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} else {
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if (!isSimpleAnnotation(inner))
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passTwo(known.getObjType(), inner, innerPath);
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else if (known.isEmpty())
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parseType(inner["!type"], innerPath, null, true).propagate(known);
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else
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continue;
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if (inner["!doc"]) known.doc = inner["!doc"];
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if (inner["!url"]) known.url = inner["!url"];
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if (inner["!span"]) known.span = inner["!span"];
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}
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}
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return base;
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}
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function copyInfo(spec, type) {
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if (spec["!doc"]) type.doc = spec["!doc"];
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if (spec["!url"]) type.url = spec["!url"];
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if (spec["!span"]) type.span = spec["!span"];
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if (spec["!data"]) type.metaData = spec["!data"];
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}
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function runPasses(type, arg) {
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var parent = infer.cx().parent, pass = parent && parent.passes && parent.passes[type];
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if (pass) for (var i = 0; i < pass.length; i++) pass[i](arg);
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}
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function doLoadEnvironment(data, scope) {
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var cx = infer.cx();
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infer.addOrigin(cx.curOrigin = data["!name"] || "env#" + cx.origins.length);
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cx.localDefs = cx.definitions[cx.curOrigin] = Object.create(null);
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runPasses("preLoadDef", data);
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passOne(scope, data);
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var def = data["!define"];
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if (def) {
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for (var name in def) {
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var spec = def[name];
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cx.localDefs[name] = typeof spec == "string" ? parsePath(spec) : passOne(null, spec, name);
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}
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for (var name in def) {
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var spec = def[name];
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if (typeof spec != "string") passTwo(cx.localDefs[name], def[name], name);
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}
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}
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passTwo(scope, data);
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runPasses("postLoadDef", data);
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cx.curOrigin = cx.localDefs = null;
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}
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exports.load = function(data, scope) {
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if (!scope) scope = infer.cx().topScope;
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var oldScope = currentTopScope;
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currentTopScope = scope;
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try {
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doLoadEnvironment(data, scope);
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} finally {
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currentTopScope = oldScope;
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}
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};
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exports.parse = function(data, origin, path) {
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var cx = infer.cx();
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if (origin) {
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cx.origin = origin;
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cx.localDefs = cx.definitions[origin];
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}
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try {
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if (typeof data == "string")
|
|
return parseType(data, path);
|
|
else
|
|
return passTwo(passOne(null, data, path), data, path);
|
|
} finally {
|
|
if (origin) cx.origin = cx.localDefs = null;
|
|
}
|
|
};
|
|
|
|
// Used to register custom logic for more involved effect or type
|
|
// computation.
|
|
var customFunctions = Object.create(null);
|
|
infer.registerFunction = function(name, f) { customFunctions[name] = f; };
|
|
|
|
var IsCreated = infer.constraint("created, target, spec", {
|
|
addType: function(tp) {
|
|
if (tp instanceof infer.Obj && this.created++ < 5) {
|
|
var derived = new infer.Obj(tp), spec = this.spec;
|
|
if (spec instanceof infer.AVal) spec = spec.getObjType(false);
|
|
if (spec instanceof infer.Obj) for (var prop in spec.props) {
|
|
var cur = spec.props[prop].types[0];
|
|
var p = derived.defProp(prop);
|
|
if (cur && cur instanceof infer.Obj && cur.props.value) {
|
|
var vtp = cur.props.value.getType(false);
|
|
if (vtp) p.addType(vtp);
|
|
}
|
|
}
|
|
this.target.addType(derived);
|
|
}
|
|
}
|
|
});
|
|
|
|
infer.registerFunction("Object_create", function(_self, args, argNodes) {
|
|
if (argNodes && argNodes.length && argNodes[0].type == "Literal" && argNodes[0].value == null)
|
|
return new infer.Obj();
|
|
|
|
var result = new infer.AVal;
|
|
if (args[0]) args[0].propagate(new IsCreated(0, result, args[1]));
|
|
return result;
|
|
});
|
|
|
|
var PropSpec = infer.constraint("target", {
|
|
addType: function(tp) {
|
|
if (!(tp instanceof infer.Obj)) return;
|
|
if (tp.hasProp("value"))
|
|
tp.getProp("value").propagate(this.target);
|
|
else if (tp.hasProp("get"))
|
|
tp.getProp("get").propagate(new infer.IsCallee(infer.ANull, [], null, this.target));
|
|
}
|
|
});
|
|
|
|
infer.registerFunction("Object_defineProperty", function(_self, args, argNodes) {
|
|
if (argNodes && argNodes.length >= 3 && argNodes[1].type == "Literal" &&
|
|
typeof argNodes[1].value == "string") {
|
|
var obj = args[0], connect = new infer.AVal;
|
|
obj.propagate(new infer.PropHasSubset(argNodes[1].value, connect, argNodes[1]));
|
|
args[2].propagate(new PropSpec(connect));
|
|
}
|
|
return infer.ANull;
|
|
});
|
|
|
|
infer.registerFunction("Object_defineProperties", function(_self, args, argNodes) {
|
|
if (args.length >= 2) {
|
|
var obj = args[0];
|
|
args[1].forAllProps(function(prop, val, local) {
|
|
if (!local) return;
|
|
var connect = new infer.AVal;
|
|
obj.propagate(new infer.PropHasSubset(prop, connect, argNodes && argNodes[1]));
|
|
val.propagate(new PropSpec(connect));
|
|
});
|
|
}
|
|
return infer.ANull;
|
|
});
|
|
|
|
var IsBound = infer.constraint("self, args, target", {
|
|
addType: function(tp) {
|
|
if (!(tp instanceof infer.Fn)) return;
|
|
this.target.addType(new infer.Fn(tp.name, infer.ANull, tp.args.slice(this.args.length),
|
|
tp.argNames.slice(this.args.length), tp.retval));
|
|
this.self.propagate(tp.self);
|
|
for (var i = 0; i < Math.min(tp.args.length, this.args.length); ++i)
|
|
this.args[i].propagate(tp.args[i]);
|
|
}
|
|
});
|
|
|
|
infer.registerFunction("Function_bind", function(self, args) {
|
|
if (!args.length) return infer.ANull;
|
|
var result = new infer.AVal;
|
|
self.propagate(new IsBound(args[0], args.slice(1), result));
|
|
return result;
|
|
});
|
|
|
|
infer.registerFunction("Array_ctor", function(_self, args) {
|
|
var arr = new infer.Arr;
|
|
if (args.length != 1 || !args[0].hasType(infer.cx().num)) {
|
|
var content = arr.getProp("<i>");
|
|
for (var i = 0; i < args.length; ++i) args[i].propagate(content);
|
|
}
|
|
return arr;
|
|
});
|
|
|
|
infer.registerFunction("Promise_ctor", function(_self, args, argNodes) {
|
|
if (args.length < 1) return infer.ANull;
|
|
var self = new infer.Obj(infer.cx().definitions.ecma6["Promise.prototype"]);
|
|
var valProp = self.defProp("value", argNodes && argNodes[0]);
|
|
var valArg = new infer.AVal;
|
|
valArg.propagate(valProp);
|
|
var exec = new infer.Fn("execute", infer.ANull, [valArg], ["value"], infer.ANull);
|
|
var reject = infer.cx().definitions.ecma6.promiseReject;
|
|
args[0].propagate(new infer.IsCallee(infer.ANull, [exec, reject], null, infer.ANull));
|
|
return self;
|
|
});
|
|
|
|
return exports;
|
|
});
|
|
|