'use strict'; var OPERATORS = { 'null':function(self){return null;}, 'true':function(self){return true;}, 'false':function(self){return false;}, $undefined:noop, '+':function(self, a,b){a=a(self); b=b(self); return (isDefined(a)?a:0)+(isDefined(b)?b:0);}, '-':function(self, a,b){a=a(self); b=b(self); return (isDefined(a)?a:0)-(isDefined(b)?b:0);}, '*':function(self, a,b){return a(self)*b(self);}, '/':function(self, a,b){return a(self)/b(self);}, '%':function(self, a,b){return a(self)%b(self);}, '^':function(self, a,b){return a(self)^b(self);}, '=':noop, '==':function(self, a,b){return a(self)==b(self);}, '!=':function(self, a,b){return a(self)!=b(self);}, '<':function(self, a,b){return a(self)':function(self, a,b){return a(self)>b(self);}, '<=':function(self, a,b){return a(self)<=b(self);}, '>=':function(self, a,b){return a(self)>=b(self);}, '&&':function(self, a,b){return a(self)&&b(self);}, '||':function(self, a,b){return a(self)||b(self);}, '&':function(self, a,b){return a(self)&b(self);}, // '|':function(self, a,b){return a|b;}, '|':function(self, a,b){return b(self)(self, a(self));}, '!':function(self, a){return !a(self);} }; var ESCAPE = {"n":"\n", "f":"\f", "r":"\r", "t":"\t", "v":"\v", "'":"'", '"':'"'}; function lex(text){ var tokens = [], token, index = 0, json = [], ch, lastCh = ':'; // can start regexp while (index < text.length) { ch = text.charAt(index); if (is('"\'')) { readString(ch); } else if (isNumber(ch) || is('.') && isNumber(peek())) { readNumber(); } else if (isIdent(ch)) { readIdent(); // identifiers can only be if the preceding char was a { or , if (was('{,') && json[0]=='{' && (token=tokens[tokens.length-1])) { token.json = token.text.indexOf('.') == -1; } } else if (is('(){}[].,;:')) { tokens.push({ index:index, text:ch, json:(was(':[,') && is('{[')) || is('}]:,') }); if (is('{[')) json.unshift(ch); if (is('}]')) json.shift(); index++; } else if (isWhitespace(ch)) { index++; continue; } else { var ch2 = ch + peek(), fn = OPERATORS[ch], fn2 = OPERATORS[ch2]; if (fn2) { tokens.push({index:index, text:ch2, fn:fn2}); index += 2; } else if (fn) { tokens.push({index:index, text:ch, fn:fn, json: was('[,:') && is('+-')}); index += 1; } else { throwError("Unexpected next character ", index, index+1); } } lastCh = ch; } return tokens; function is(chars) { return chars.indexOf(ch) != -1; } function was(chars) { return chars.indexOf(lastCh) != -1; } function peek() { return index + 1 < text.length ? text.charAt(index + 1) : false; } function isNumber(ch) { return '0' <= ch && ch <= '9'; } function isWhitespace(ch) { return ch == ' ' || ch == '\r' || ch == '\t' || ch == '\n' || ch == '\v' || ch == '\u00A0'; // IE treats non-breaking space as \u00A0 } function isIdent(ch) { return 'a' <= ch && ch <= 'z' || 'A' <= ch && ch <= 'Z' || '_' == ch || ch == '$'; } function isExpOperator(ch) { return ch == '-' || ch == '+' || isNumber(ch); } function throwError(error, start, end) { end = end || index; throw Error("Lexer Error: " + error + " at column" + (isDefined(start) ? "s " + start + "-" + index + " [" + text.substring(start, end) + "]" : " " + end) + " in expression [" + text + "]."); } function readNumber() { var number = ""; var start = index; while (index < text.length) { var ch = lowercase(text.charAt(index)); if (ch == '.' || isNumber(ch)) { number += ch; } else { var peekCh = peek(); if (ch == 'e' && isExpOperator(peekCh)) { number += ch; } else if (isExpOperator(ch) && peekCh && isNumber(peekCh) && number.charAt(number.length - 1) == 'e') { number += ch; } else if (isExpOperator(ch) && (!peekCh || !isNumber(peekCh)) && number.charAt(number.length - 1) == 'e') { throwError('Invalid exponent'); } else { break; } } index++; } number = 1 * number; tokens.push({index:start, text:number, json:true, fn:function() {return number;}}); } function readIdent() { var ident = ""; var start = index; var fn; while (index < text.length) { var ch = text.charAt(index); if (ch == '.' || isIdent(ch) || isNumber(ch)) { ident += ch; } else { break; } index++; } fn = OPERATORS[ident]; tokens.push({ index:start, text:ident, json: fn, fn:fn||extend(getterFn(ident), { assign:function(self, value){ return setter(self, ident, value); } }) }); } function readString(quote) { var start = index; index++; var string = ""; var rawString = quote; var escape = false; while (index < text.length) { var ch = text.charAt(index); rawString += ch; if (escape) { if (ch == 'u') { var hex = text.substring(index + 1, index + 5); if (!hex.match(/[\da-f]{4}/i)) throwError( "Invalid unicode escape [\\u" + hex + "]"); index += 4; string += String.fromCharCode(parseInt(hex, 16)); } else { var rep = ESCAPE[ch]; if (rep) { string += rep; } else { string += ch; } } escape = false; } else if (ch == '\\') { escape = true; } else if (ch == quote) { index++; tokens.push({ index:start, text:rawString, string:string, json:true, fn:function() { return string; } }); return; } else { string += ch; } index++; } throwError("Unterminated quote", start); } } ///////////////////////////////////////// function parser(text, json, $filter){ var ZERO = valueFn(0), value, tokens = lex(text), assignment = _assignment, assignable = logicalOR, functionCall = _functionCall, fieldAccess = _fieldAccess, objectIndex = _objectIndex, filterChain = _filterChain, functionIdent = _functionIdent; if(json){ // The extra level of aliasing is here, just in case the lexer misses something, so that // we prevent any accidental execution in JSON. assignment = logicalOR; functionCall = fieldAccess = objectIndex = assignable = filterChain = functionIdent = function() { throwError("is not valid json", {text:text, index:0}); }; value = primary(); } else { value = statements(); } if (tokens.length !== 0) { throwError("is an unexpected token", tokens[0]); } return value; /////////////////////////////////// function throwError(msg, token) { throw Error("Syntax Error: Token '" + token.text + "' " + msg + " at column " + (token.index + 1) + " of the expression [" + text + "] starting at [" + text.substring(token.index) + "]."); } function peekToken() { if (tokens.length === 0) throw Error("Unexpected end of expression: " + text); return tokens[0]; } function peek(e1, e2, e3, e4) { if (tokens.length > 0) { var token = tokens[0]; var t = token.text; if (t==e1 || t==e2 || t==e3 || t==e4 || (!e1 && !e2 && !e3 && !e4)) { return token; } } return false; } function expect(e1, e2, e3, e4){ var token = peek(e1, e2, e3, e4); if (token) { if (json && !token.json) { throwError("is not valid json", token); } tokens.shift(); return token; } return false; } function consume(e1){ if (!expect(e1)) { throwError("is unexpected, expecting [" + e1 + "]", peek()); } } function unaryFn(fn, right) { return function(self) { return fn(self, right); }; } function binaryFn(left, fn, right) { return function(self) { return fn(self, left, right); }; } function hasTokens () { return tokens.length > 0; } function statements() { var statements = []; while(true) { if (tokens.length > 0 && !peek('}', ')', ';', ']')) statements.push(filterChain()); if (!expect(';')) { // optimize for the common case where there is only one statement. // TODO(size): maybe we should not support multiple statements? return statements.length == 1 ? statements[0] : function(self){ var value; for ( var i = 0; i < statements.length; i++) { var statement = statements[i]; if (statement) value = statement(self); } return value; }; } } } function _filterChain() { var left = expression(); var token; while(true) { if ((token = expect('|'))) { left = binaryFn(left, token.fn, filter()); } else { return left; } } } function filter() { var token = expect(); var fn = $filter(token.text); var argsFn = []; while(true) { if ((token = expect(':'))) { argsFn.push(expression()); } else { var fnInvoke = function(self, input){ var args = [input]; for ( var i = 0; i < argsFn.length; i++) { args.push(argsFn[i](self)); } return fn.apply(self, args); }; return function() { return fnInvoke; }; } } } function expression() { return assignment(); } function _assignment() { var left = logicalOR(); var right; var token; if ((token = expect('='))) { if (!left.assign) { throwError("implies assignment but [" + text.substring(0, token.index) + "] can not be assigned to", token); } right = logicalOR(); return function(self){ return left.assign(self, right(self)); }; } else { return left; } } function logicalOR() { var left = logicalAND(); var token; while(true) { if ((token = expect('||'))) { left = binaryFn(left, token.fn, logicalAND()); } else { return left; } } } function logicalAND() { var left = equality(); var token; if ((token = expect('&&'))) { left = binaryFn(left, token.fn, logicalAND()); } return left; } function equality() { var left = relational(); var token; if ((token = expect('==','!='))) { left = binaryFn(left, token.fn, equality()); } return left; } function relational() { var left = additive(); var token; if ((token = expect('<', '>', '<=', '>='))) { left = binaryFn(left, token.fn, relational()); } return left; } function additive() { var left = multiplicative(); var token; while ((token = expect('+','-'))) { left = binaryFn(left, token.fn, multiplicative()); } return left; } function multiplicative() { var left = unary(); var token; while ((token = expect('*','/','%'))) { left = binaryFn(left, token.fn, unary()); } return left; } function unary() { var token; if (expect('+')) { return primary(); } else if ((token = expect('-'))) { return binaryFn(ZERO, token.fn, unary()); } else if ((token = expect('!'))) { return unaryFn(token.fn, unary()); } else { return primary(); } } function _functionIdent(fnScope) { var token = expect(); var element = token.text.split('.'); var instance = fnScope; var key; for ( var i = 0; i < element.length; i++) { key = element[i]; if (instance) instance = instance[key]; } if (!isFunction(instance)) { throwError("should be a function", token); } return instance; } function primary() { var primary; if (expect('(')) { var expression = filterChain(); consume(')'); primary = expression; } else if (expect('[')) { primary = arrayDeclaration(); } else if (expect('{')) { primary = object(); } else { var token = expect(); primary = token.fn; if (!primary) { throwError("not a primary expression", token); } } var next; while ((next = expect('(', '[', '.'))) { if (next.text === '(') { primary = functionCall(primary); } else if (next.text === '[') { primary = objectIndex(primary); } else if (next.text === '.') { primary = fieldAccess(primary); } else { throwError("IMPOSSIBLE"); } } return primary; } function _fieldAccess(object) { var field = expect().text; var getter = getterFn(field); return extend(function(self){ return getter(object(self)); }, { assign:function(self, value){ return setter(object(self), field, value); } }); } function _objectIndex(obj) { var indexFn = expression(); consume(']'); return extend( function(self){ var o = obj(self), i = indexFn(self), v, p; if (!o) return undefined; v = o[i]; if (v && v.then) { p = v; if (!('$$v' in v)) { p.$$v = undefined; p.then(function(val) { p.$$v = val; }); } v = v.$$v; } return v; }, { assign:function(self, value){ return obj(self)[indexFn(self)] = value; } }); } function _functionCall(fn) { var argsFn = []; if (peekToken().text != ')') { do { argsFn.push(expression()); } while (expect(',')); } consume(')'); return function(self){ var args = []; for ( var i = 0; i < argsFn.length; i++) { args.push(argsFn[i](self)); } var fnPtr = fn(self) || noop; // IE stupidity! return fnPtr.apply ? fnPtr.apply(self, args) : fnPtr(args[0], args[1], args[2], args[3], args[4]); }; } // This is used with json array declaration function arrayDeclaration () { var elementFns = []; if (peekToken().text != ']') { do { elementFns.push(expression()); } while (expect(',')); } consume(']'); return function(self){ var array = []; for ( var i = 0; i < elementFns.length; i++) { array.push(elementFns[i](self)); } return array; }; } function object () { var keyValues = []; if (peekToken().text != '}') { do { var token = expect(), key = token.string || token.text; consume(":"); var value = expression(); keyValues.push({key:key, value:value}); } while (expect(',')); } consume('}'); return function(self){ var object = {}; for ( var i = 0; i < keyValues.length; i++) { var keyValue = keyValues[i]; var value = keyValue.value(self); object[keyValue.key] = value; } return object; }; } function watchDecl () { var anchorName = expect().text; consume(":"); var expressionFn; if (peekToken().text == '{') { consume("{"); expressionFn = statements(); consume("}"); } else { expressionFn = expression(); } return function(self) { return {name:anchorName, fn:expressionFn}; }; } } ////////////////////////////////////////////////// // Parser helper functions ////////////////////////////////////////////////// function setter(obj, path, setValue) { var element = path.split('.'); for (var i = 0; element.length > 1; i++) { var key = element.shift(); var propertyObj = obj[key]; if (!propertyObj) { propertyObj = {}; obj[key] = propertyObj; } obj = propertyObj; } obj[element.shift()] = setValue; return setValue; } /** * Return the value accesible from the object by path. Any undefined traversals are ignored * @param {Object} obj starting object * @param {string} path path to traverse * @param {boolean=true} bindFnToScope * @returns value as accesbile by path */ //TODO(misko): this function needs to be removed function getter(obj, path, bindFnToScope) { if (!path) return obj; var keys = path.split('.'); var key; var lastInstance = obj; var len = keys.length; for (var i = 0; i < len; i++) { key = keys[i]; if (obj) { obj = (lastInstance = obj)[key]; } } if (!bindFnToScope && isFunction(obj)) { return bind(lastInstance, obj); } return obj; } var getterFnCache = {}, JS_KEYWORDS = {}; forEach( ("abstract,boolean,break,byte,case,catch,char,class,const,continue,debugger,default," + "delete,do,double,else,enum,export,extends,false,final,finally,float,for,function,goto," + "if,implements,import,in,instanceof,int,interface,long,native,new,null,package,private," + "protected,public,return,short,static,super,switch,synchronized,this,throw,throws," + "transient,true,try,typeof,var,volatile,void,undefined,while,with").split(/,/), function(key){ JS_KEYWORDS[key] = true;} ); function getterFn(path) { var fn = getterFnCache[path]; if (fn) return fn; var code = 'var l, fn, p;\n'; forEach(path.split('.'), function(key) { key = (JS_KEYWORDS[key]) ? '["' + key + '"]' : '.' + key; code += 'if(!s) return s;\n' + 'l=s;\n' + 's=s' + key + ';\n' + 'if(typeof s=="function" && !(s instanceof RegExp)) {\n' + ' fn=function(){ return l' + key + '.apply(l, arguments); };\n' + ' fn.$unboundFn=s;\n' + ' s=fn;\n' + '} else if (s && s.then) {\n' + ' if (!("$$v" in s)) {\n' + ' p=s;\n' + ' p.$$v = undefined;\n' + ' p.then(function(v) {p.$$v=v;});\n' + '}\n' + ' s=s.$$v\n' + '}\n'; }); code += 'return s;'; fn = Function('s', code); fn.toString = function() { return code; }; return getterFnCache[path] = fn; } /////////////////////////////////// function $ParseProvider() { var cache = {}; this.$get = ['$filter', function($filter) { return function(exp) { switch(typeof exp) { case 'string': return cache.hasOwnProperty(exp) ? cache[exp] : cache[exp] = parser(exp, false, $filter); case 'function': return exp; default: return noop; } }; }]; } // This is a special access for JSON parser which bypasses the injector var parseJson = function(json) { return parser(json, true); }; 82'>482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867