move(parser): appease the History God

1 files changed, 739 insertions, 0 deletions

diff --git a/src/service/parse.js b/src/service/parse.js
new file mode 100644
index 00000000..41fff7d5
--- /dev/null
+++ b/src/service/parse.js
@@ -0,0 +1,739 @@
+'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)<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(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, parseStringsForObjects){
+  var dateParseLength = parseStringsForObjects ? DATE_ISOSTRING_LN : -1,
+      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.length == dateParseLength)
+              ? angular['String']['toDate'](string)
+              : string;
+          }});
+        return;
+      } else {
+        string += ch;
+      }
+      index++;
+    }
+    throwError("Unterminated quote", start);
+  }
+}
+
+/////////////////////////////////////////
+
+function parser(text, json){
+  var ZERO = valueFn(0),
+      tokens = lex(text, json),
+      assignment = _assignment,
+      assignable = logicalOR,
+      functionCall = _functionCall,
+      fieldAccess = _fieldAccess,
+      objectIndex = _objectIndex,
+      filterChain = _filterChain,
+      functionIdent = _functionIdent,
+      pipeFunction = _pipeFunction;
+  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 =
+      pipeFunction =
+        function() { throwError("is not valid json", {text:text, index:0}); };
+  }
+  //TODO: Shouldn't all of the public methods have assertAllConsumed?
+  //TODO: I think these should be public as part of the parser api instead of scope.$eval().
+  return {
+      assignable: assertConsumed(assignable),
+      primary: assertConsumed(primary),
+      statements: assertConsumed(statements)
+  };
+
+  function assertConsumed(fn) {
+    return function() {
+      var value = fn();
+      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() {
+    return pipeFunction(angularFilter);
+  }
+
+  function _pipeFunction(fnScope){
+    var fn = functionIdent(fnScope);
+    var argsFn = [];
+    var token;
+    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);
+        var i = indexFn(self);
+        return (o) ? o[i] : undefined;
+      }, {
+        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
+ */
+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 (isUndefined(obj)  && key.charAt(0) == '$') {
+      var type = angularGlobal.typeOf(lastInstance);
+      type = angular[type.charAt(0).toUpperCase()+type.substring(1)];
+      var fn = type ? type[[key.substring(1)]] : _undefined;
+      if (fn) {
+        return obj = bind(lastInstance, fn, lastInstance);
+      }
+    }
+  }
+  if (!bindFnToScope && isFunction(obj)) {
+    return bind(lastInstance, obj);
+  }
+  return obj;
+}
+
+var getterFnCache = {},
+    compileCache = {},
+    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,ininstanceof,intinterface,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, t;\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.$unboundFn=s;\n' +
+              ' s=fn;\n' +
+            '}\n';
+    if (key.charAt(1) == '$') {
+      // special code for super-imposed functions
+      var name = key.substr(2);
+      code += 'if(!s) {\n' +
+              ' t = angular.Global.typeOf(l);\n' +
+              ' fn = (angular[t.charAt(0).toUpperCase() + t.substring(1)]||{})["' + name + '"];\n' +
+              ' if (fn) ' +
+                 's = function(){ return fn.apply(l, [l].concat(Array.prototype.slice.call(arguments, 0))); };\n' +
+              '}\n';
+    }
+  });
+  code += 'return s;';
+  fn = Function('s', code);
+  fn["toString"] = function() { return code; };
+
+  return getterFnCache[path] = fn;
+}
+
+///////////////////////////////////
+
+// TODO(misko): Deprecate? Remove!
+// I think that compilation should be a service.
+function expressionCompile(exp) {
+  if (isFunction(exp)) return exp;
+  var fn = compileCache[exp];
+  if (!fn) {
+    fn = compileCache[exp] =  parser(exp).statements();
+  }
+  return fn;
+}