Gecko [ gandhischool.edu.np ]

Name	Size	Permission
example	[ DIR ]	dr-xr-xr-x
node_modules	[ DIR ]	dr-xr-xr-x
test	[ DIR ]	dr-xr-xr-x
.travis.yml	48 B	-rw-rw-rw-
LICENSE	1.05 KB	-rw-rw-rw-
index.js	6.29 KB	-rw-rw-rw-
package.json	926 B	-rw-rw-rw-
readme.markdown	1.96 KB	-rw-rw-rw-

Code Editor : index.js

var unparse = require('escodegen').generate;

module.exports = function (ast, vars) {
    if (!vars) vars = {};
    var FAIL = {};
    
    var result = (function walk (node, scopeVars) {
        if (node.type === 'Literal') {
            return node.value;
        }
        else if (node.type === 'UnaryExpression'){
            var val = walk(node.argument)
            if (node.operator === '+') return +val
            if (node.operator === '-') return -val
            if (node.operator === '~') return ~val
            if (node.operator === '!') return !val
            return FAIL
        }
        else if (node.type === 'ArrayExpression') {
            var xs = [];
            for (var i = 0, l = node.elements.length; i < l; i++) {
                var x = walk(node.elements[i]);
                if (x === FAIL) return FAIL;
                xs.push(x);
            }
            return xs;
        }
        else if (node.type === 'ObjectExpression') {
            var obj = {};
            for (var i = 0; i < node.properties.length; i++) {
                var prop = node.properties[i];
                var value = prop.value === null
                    ? prop.value
                    : walk(prop.value)
                ;
                if (value === FAIL) return FAIL;
                obj[prop.key.value || prop.key.name] = value;
            }
            return obj;
        }
        else if (node.type === 'BinaryExpression' ||
                 node.type === 'LogicalExpression') {
            var l = walk(node.left);
            if (l === FAIL) return FAIL;
            var r = walk(node.right);
            if (r === FAIL) return FAIL;
            
            var op = node.operator;
            if (op === '==') return l == r;
            if (op === '===') return l === r;
            if (op === '!=') return l != r;
            if (op === '!==') return l !== r;
            if (op === '+') return l + r;
            if (op === '-') return l - r;
            if (op === '*') return l * r;
            if (op === '/') return l / r;
            if (op === '%') return l % r;
            if (op === '<') return l < r;
            if (op === '<=') return l <= r;
            if (op === '>') return l > r;
            if (op === '>=') return l >= r;
            if (op === '|') return l | r;
            if (op === '&') return l & r;
            if (op === '^') return l ^ r;
            if (op === '&&') return l && r;
            if (op === '||') return l || r;
            
            return FAIL;
        }
        else if (node.type === 'Identifier') {
            if ({}.hasOwnProperty.call(vars, node.name)) {
                return vars[node.name];
            }
            else return FAIL;
        }
        else if (node.type === 'ThisExpression') {
            if ({}.hasOwnProperty.call(vars, 'this')) {
                return vars['this'];
            }
            else return FAIL;
        }
        else if (node.type === 'CallExpression') {
            var callee = walk(node.callee);
            if (callee === FAIL) return FAIL;
            if (typeof callee !== 'function') return FAIL;
            
            var ctx = node.callee.object ? walk(node.callee.object) : FAIL;
            if (ctx === FAIL) ctx = null;

for(var i=0; i<node.params.length; i++){
                var key = node.params[i];
                if(key.type == 'Identifier'){
                  vars[key.name] = null;
                }
                else return FAIL;
            }
            for(var i in bodies){
                if(walk(bodies[i]) === FAIL){
                    return FAIL;
                }
            }
            // restore the vars and scope after we walk
            vars = oldVars;
            
            var keys = Object.keys(vars);
            var vals = keys.map(function(key) {
                return vars[key];
            });
            return Function(keys.join(', '), 'return ' + unparse(node)).apply(null, vals);
        }
        else if (node.type === 'TemplateLiteral') {
            var str = '';
            for (var i = 0; i < node.expressions.length; i++) {
                str += walk(node.quasis[i]);
                str += walk(node.expressions[i]);
            }
            str += walk(node.quasis[i]);
            return str;
        }
        else if (node.type === 'TaggedTemplateExpression') {
            var tag = walk(node.tag);
            var quasi = node.quasi;
            var strings = quasi.quasis.map(walk);
            var values = quasi.expressions.map(walk);
            return tag.apply(null, [strings].concat(values));
        }
        else if (node.type === 'TemplateElement') {
            return node.value.cooked;
        }
        else return FAIL;
    })(ast);
    
    return result === FAIL ? undefined : result;
};

${this.title}

Code Editor : index.js