Add expressions and variables

public_html/index.html

@@ -11,6 +11,7 @@
         <script src="js/TokenType.js"></script>
         <script src="js/Token.js"></script>
         <script src="js/Lexer.js"></script>
+        <script src="js/Ast.js"></script>
         <script src="js/Parser.js"></script>
         <script src="js/Views.js"></script>
         <script src="js/Main.js"></script>
@@ -25,7 +26,6 @@
                 <div id="textAuthor"></div>
                 <div id="textContent"></div>
             </div>
-            <div id="finish"><a href="/">Вернуться на главную</a></div>
         </div>
     </body>
 </html>

public_html/js/Ast.js

@@ -0,0 +1,60 @@
+Operator = {
+    ADD         : function (leftVal, rightVal) { return leftVal + rightVal; },
+    SUBTRACT    : function (leftVal, rightVal) { return leftVal - rightVal; },
+    MULTIPLY    : function (leftVal, rightVal) { return leftVal * rightVal; },
+    DIVIDE      : function (leftVal, rightVal) { return leftVal / rightVal; },
+    
+    EQUALS      : function (leftVal, rightVal) { return (leftVal == rightVal) ? 1 : 0; },
+    NOTEQUALS   : function (leftVal, rightVal) { return (leftVal != rightVal) ? 1 : 0; },
+    
+    GT          : function (leftVal, rightVal) { return (leftVal > rightVal) ? 1 : 0; },
+    LT          : function (leftVal, rightVal) { return (leftVal < rightVal) ? 1 : 0; },
+    GTEQ        : function (leftVal, rightVal) { return (leftVal >= rightVal) ? 1 : 0; },
+    LTEQ        : function (leftVal, rightVal) { return (leftVal <= rightVal) ? 1 : 0; },
+    
+    BOOLEAN_OR  : function (leftVal, rightVal) { ((leftVal != 0) || (rightVal != 0)) ? 1 : 0; },
+    BOOLEAN_AND : function (leftVal, rightVal) { ((leftVal != 0) && (rightVal != 0)) ? 1 : 0; }
+};
+
+function VariablesHolder() {
+    this.variables = {};
+}
+VariablesHolder.prototype.init = function () {
+    this.variables = {
+        "True": 1,
+        "False": 0
+    };
+};
+VariablesHolder.prototype.getVariable = function (name) {
+    if (name in this.variables) {
+        return this.variables[name];
+    }
+    return 0;
+};
+VariablesHolder.prototype.setVariable = function (name, value) {
+    this.variables[name] = value;
+};
+Variables = new VariablesHolder();
+
+function BinaryExpression(op, left, right) {
+    this.op = op;
+    this.left = left;
+    this.right = right;
+}
+BinaryExpression.prototype.eval = function () {
+    return this.op(this.left.eval(), this.right.eval());
+};
+
+function ValueExpression(value) {
+    this.value = value;
+}
+ValueExpression.prototype.eval = function () {
+    return this.value;
+};
+
+function VariableExpression(variable) {
+    this.variable = variable;
+}
+VariableExpression.prototype.eval = function () {
+    return Variables.getVariable(this.variable);
+};