rename src/Parser.js to src/parser.js

1 files changed, 663 insertions, 0 deletions

diff --git a/src/parser.js b/src/parser.js
new file mode 100644
index 00000000..8dc8f9c2
--- /dev/null
+++ b/src/parser.js
@@ -0,0 +1,663 @@
+var OPERATORS = {
+    'null':function(self){return _null;},
+    'true':function(self){return true;},
+    'false':function(self){return false;},
+    $undefined:noop,
+    '+':function(self, a,b){return (isDefined(a)?a:0)+(isDefined(b)?b:0);},
+    '-':function(self, a,b){return (isDefined(a)?a:0)-(isDefined(b)?b:0);},
+    '*':function(self, a,b){return a*b;},
+    '/':function(self, a,b){return a/b;},
+    '%':function(self, a,b){return a%b;},
+    '^':function(self, a,b){return a^b;},
+    '=':function(self, a,b){return setter(self, a, b);},
+    '==':function(self, a,b){return a==b;},
+    '!=':function(self, a,b){return a!=b;},
+    '<':function(self, a,b){return a<b;},
+    '>':function(self, a,b){return a>b;},
+    '<=':function(self, a,b){return a<=b;},
+    '>=':function(self, a,b){return a>=b;},
+    '&&':function(self, a,b){return a&&b;},
+    '||':function(self, a,b){return a||b;},
+    '&':function(self, a,b){return a&b;},
+//    '|':function(self, a,b){return a|b;},
+    '|':function(self, a,b){return b(self, a);},
+    '!':function(self, a){return !a;}
+};
+var ESCAPE = {"n":"\n", "f":"\f", "r":"\r", "t":"\t", "v":"\v", "'":"'", '"':'"'};
+
+function lex(text, parseStringsForObjects){
+  var dateParseLength = parseStringsForObjects ? 20 : -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 ( was('({[:,;') && is('/') ) {
+      readRegexp();
+    } else if (isIdent(ch)) {
+      readIdent();
+      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: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 {
+        throw "Lexer Error: Unexpected next character [" +
+            text.substring(index) +
+            "] in expression '" + text +
+            "' at column '" + (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 == '+';
+  }
+  function readNumber() {
+    var number = "";
+    var start = index;
+    while (index < text.length) {
+      var ch = 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') {
+          throw 'Lexer found invalid exponential value "' + text + '"';
+        } 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;
+    while (index < text.length) {
+      var ch = text.charAt(index);
+      if (ch == '.' || isIdent(ch) || isNumber(ch)) {
+        ident += ch;
+      } else {
+        break;
+      }
+      index++;
+    }
+    var fn = OPERATORS[ident];
+    if (!fn) {
+      fn = getterFn(ident);
+      fn.isAssignable = ident;
+    }
+    tokens.push({index:start, text:ident, fn:fn, json: OPERATORS[ident]});
+  }
+
+  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))
+            throw "Lexer Error: Invalid unicode escape [\\u" +
+              hex + "] starting at column '" +
+              start + "' in expression '" + text + "'.";
+          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++;
+    }
+    throw "Lexer Error: Unterminated quote [" +
+        text.substring(start) + "] starting at column '" +
+        (start+1) + "' in expression '" + text + "'.";
+  }
+  function readRegexp(quote) {
+    var start = index;
+    index++;
+    var regexp = "";
+    var escape = false;
+    while (index < text.length) {
+      var ch = text.charAt(index);
+      if (escape) {
+        regexp += ch;
+        escape = false;
+      } else if (ch === '\\') {
+        regexp += ch;
+        escape = true;
+      } else if (ch === '/') {
+        index++;
+        var flags = "";
+        if (isIdent(text.charAt(index))) {
+          readIdent();
+          flags = tokens.pop().text;
+        }
+        var compiledRegexp = new RegExp(regexp, flags);
+        tokens.push({index:start, text:regexp, flags:flags,
+          fn:function(){return compiledRegexp;}});
+        return;
+      } else {
+        regexp += ch;
+      }
+      index++;
+    }
+    throw "Lexer Error: Unterminated RegExp [" +
+        text.substring(start) + "] starting at column '" +
+        (start+1) + "' in expression '" + text + "'.";
+  }
+}
+
+/////////////////////////////////////////
+
+function parser(text, json){
+  var ZERO = valueFn(0),
+      tokens = lex(text, json);
+  return {
+      assertAllConsumed: assertAllConsumed,
+      primary: primary,
+      statements: statements,
+      validator: validator,
+      filter: filter,
+      watch: watch
+  };
+
+  ///////////////////////////////////
+
+  function error(msg, token) {
+    throw "Token '" + token.text +
+      "' is " + msg + " at column='" +
+      (token.index + 1) + "' of expression '" +
+      text + "' starting at '" + text.substring(token.index) + "'.";
+  }
+
+  function peekToken() {
+    if (tokens.length === 0)
+      throw "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) {
+        index = token.index;
+        throw "Expression at column='" +
+          token.index + "' of expression '" +
+          text + "' starting at '" + text.substring(token.index) +
+          "' is not valid json.";
+      }
+      tokens.shift();
+      this.currentToken = token;
+      return token;
+    }
+    return false;
+  }
+
+  function consume(e1){
+    if (!expect(e1)) {
+      var token = peek();
+      throw "Expecting '" + e1 + "' at column '" +
+          (token.index+1) + "' in '" +
+          text + "' got '" +
+          text.substring(token.index) + "'.";
+    }
+  }
+
+  function unaryFn(fn, right) {
+    return function(self) {
+      return fn(self, right(self));
+    };
+  }
+
+  function binaryFn(left, fn, right) {
+    return function(self) {
+      return fn(self, left(self), right(self));
+    };
+  }
+
+  function hasTokens () {
+    return tokens.length > 0;
+  }
+
+  function assertAllConsumed(){
+    if (tokens.length !== 0) {
+      throw "Did not understand '" + text.substring(tokens[0].index) +
+          "' while evaluating '" + text + "'.";
+    }
+  }
+
+  function statements(){
+    var statements = [];
+    while(true) {
+      if (tokens.length > 0 && !peek('}', ')', ';', ']'))
+        statements.push(filterChain());
+      if (!expect(';')) {
+        return 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 validator(){
+    return pipeFunction(angularValidator);
+  }
+
+  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 throwStmt();
+  }
+
+  function throwStmt(){
+    if (expect('throw')) {
+      var throwExp = assignment();
+      return function (self) {
+        throw throwExp(self);
+      };
+    } else {
+      return assignment();
+    }
+  }
+
+  function assignment(){
+    var left = logicalOR();
+    var token;
+    if (token = expect('=')) {
+      if (!left.isAssignable) {
+        throw "Left hand side '" +
+        text.substring(0, token.index) + "' of assignment '" +
+        text.substring(token.index) + "' is not assignable.";
+      }
+      var ident = function(){return left.isAssignable;};
+      return binaryFn(ident, token.fn, logicalOR());
+    } 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 (typeof instance != $function) {
+      throw "Function '" + token.text + "' at column '" +
+      (token.index+1)  + "' in '" + text + "' is not defined.";
+    }
+    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) {
+        error("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 {
+        throw "IMPOSSIBLE";
+      }
+    }
+    return primary;
+  }
+
+  function fieldAccess(object) {
+    var field = expect().text;
+    var getter = getterFn(field);
+    var fn = function (self){
+      return getter(object(self));
+    };
+    fn.isAssignable = field;
+    return fn;
+  }
+
+  function objectIndex(obj) {
+    var indexFn = expression();
+    consume(']');
+    if (expect('=')) {
+      var rhs = expression();
+      return function (self){
+        return obj(self)[indexFn(self)] = rhs(self);
+      };
+    } else {
+      return function (self){
+        var o = obj(self);
+        var i = indexFn(self);
+        return (o) ? o[i] : _undefined;
+      };
+    }
+  }
+
+  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 watch () {
+    var decl = [];
+    while(hasTokens()) {
+      decl.push(watchDecl());
+      if (!expect(';')) {
+        assertAllConsumed();
+      }
+    }
+    assertAllConsumed();
+    return function (self){
+      for ( var i = 0; i < decl.length; i++) {
+        var d = decl[i](self);
+        self.addListener(d.name, d.fn);
+      }
+    };
+  }
+
+  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};
+    };
+  }
+}
+
+
+
+