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Marek Kotewicz 10 years ago
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  1. 3
      .gitignore
  2. 8
      .travis.yml
  3. 47
      README.md
  4. 3570
      dist/natspec.js
  5. 1
      dist/natspec.js.map
  6. 2
      dist/natspec.min.js
  7. 13
      example/example.html
  8. 186
      natspec.js
  9. 24
      package.json
  10. 149
      test/test.js

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# VIM stuff
*.swp
node_modules/

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.travis.yml
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language: node_js
node_js:
- "0.11"
- "0.10"
before_script:
- npm install
after_script:
- npm run-script test-coveralls

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README.md
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# natspec.js
Javascript Library used to evaluate natspec expressions
[![Build Status][travis-image]][travis-url] [![Coverage Status][coveralls-image]][coveralls-url]
[travis-image]: https://travis-ci.org/ethereum/natspec.js.svg
[travis-url]: https://travis-ci.org/ethereum/natspec.js
[coveralls-image]: https://coveralls.io/repos/ethereum/natspec.js/badge.svg?branch=master
[coveralls-url]: https://coveralls.io/r/ethereum/natspec.js?branch=master
## Usage
It exposes global object `natspec` with method `evaluateExpression`.
```javascript
var natspec = require('natspec');
var natspecExpression = "Will multiply `a` by 7 and return `a * 7`.";
var call = {
method: 'multiply',
abi: abi,
transaction: transaction
};
var evaluatedExpression = natspec.evaluateExpression(natspecExpression, call);
console.log(evaluatedExpression); // "Will multiply 4 by 7 and return 28."
```
More examples are available [here](https://github.com/ethereum/natspec.js/blob/master/test/test.js).
## Building
```bash
npm run-script build
```
## Testing (mocha)
```bash
npm test
```
## Wiki
* [Ethereum Natural Specification Format](https://github.com/ethereum/wiki/wiki/Ethereum-Natural-Specification-Format)
* [Natspec Example](https://github.com/ethereum/wiki/wiki/Natspec-Example)

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example/example.html
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<!doctype>
<html>
<head>
<script type="text/javascript" src="../dist/natspec.js"></script>
<script type="text/javascript">
var natspec = require('natspec');
</script>
</head>
<body>
</body>
</html>

186
natspec.js
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/*
This file is part of natspec.js.
natspec.js is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
natspec.js is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with natspec.js. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file natspec.js
* @authors:
* Marek Kotewicz <marek@ethdev.com>
* @date 2015
*/
var abi = require('./node_modules/ethereum.js/lib/abi.js');
/**
* This object should be used to evaluate natspec expression
* It has one method evaluateExpression which shoul be used
*/
var natspec = (function () {
/**
* Helper method
* Should be called to copy values from object to global context
*
* @method copyToContext
* @param {Object} object from which we want to copy properties
* @param {Object} object to which we copy
*/
var copyToContext = function (obj, context) {
Object.keys(obj).forEach(function (key) {
context[key] = obj[key];
});
}
/**
* Should be used to generate codes, which will be evaluated
*
* @method generateCode
* @param {Object} object from which code will be generated
* @return {String} javascript code which is used to initalized variables
*/
var generateCode = function (obj) {
return Object.keys(obj).reduce(function (acc, key) {
return acc + "var " + key + " = context['" + key + "'];\n";
}, "");
};
/**
* Helper method
* Should be called to get method with given name from the abi
*
* @method getMethodWithName
* @param {Array} contract's abi
* @param {String} name of the method that we are looking for
* @return {Object} abi for method with name
*/
var getMethodWithName = function(abi, name) {
return abi.filter(function (method) {
return method.name === name;
})[0];
};
/**
* Should be used to get all contract method input variables
*
* @method getMethodInputParams
* @param {Object} abi for certain method
* @param {Object} transaction object
* @return {Object} object with all contract's method input variables
*/
var getMethodInputParams = function (method, transaction) {
// do it with output formatter (cause we have to decode)
var params = abi.formatOutput(method.inputs, '0x' + transaction.params[0].data.slice(10));
return method.inputs.reduce(function (acc, current, index) {
acc[current.name] = params[index];
return acc;
}, {});
};
/**
* Should be called when we want to evaluate natspec expression
* Replaces all natspec 'subexpressions' with evaluated value
*
* @method mapExpressionToEvaluate
* @param {String} expression to evaluate
* @param {Function} callback which is called to evaluate te expression
* @return {String} evaluated expression
*/
var mapExpressionsToEvaluate = function (expression, cb) {
var evaluatedExpression = "";
// match everything in `` quotes
var pattern = /\`(?:\\.|[^`\\])*\`/gim
var match;
var lastIndex = 0;
try {
while ((match = pattern.exec(expression)) !== null) {
var startIndex = pattern.lastIndex - match[0].length;
var toEval = match[0].slice(1, match[0].length - 1);
evaluatedExpression += expression.slice(lastIndex, startIndex);
var evaluatedPart = cb(toEval);
evaluatedExpression += evaluatedPart;
lastIndex = pattern.lastIndex;
}
evaluatedExpression += expression.slice(lastIndex);
}
catch (err) {
throw new Error("Natspec evaluation failed, wrong input params");
}
return evaluatedExpression;
};
/**
* Should be called to evaluate single expression
* Is internally using javascript's 'eval' method
*
* @method evaluateExpression
* @param {String} expression which should be evaluated
* @param {Object} [call] object containing contract abi, transaction, called method
* @return {String} evaluated expression
* @throws exception if method is not found or we are trying to evaluate input params that does not exists
*/
var evaluateExpression = function (expression, call) {
//var self = this;
var context = {};
if (!!call) {
try {
var method = getMethodWithName(call.abi, call.method);
var params = getMethodInputParams(method, call.transaction);
copyToContext(params, context);
}
catch (err) {
throw new Error("Natspec evaluation failed, method does not exist");
}
}
var code = generateCode(context);
var evaluatedExpression = mapExpressionsToEvaluate(expression, function (toEval) {
var fn = new Function("context", code + "return " + toEval + ";");
return fn(context).toString();
});
return evaluatedExpression;
};
/**
* Safe version of evaluateExpression
* Instead of throwing an exception it returns it as a string
*
* @method evaluateExpressionSafe
* @param {String} expression which should be evaluated
* @param {Object} [call] object containing contract abi, transaction, called method
* @return {String} evaluated expression
*/
var evaluateExpressionSafe = function (expression, call) {
try {
return evaluateExpression(expression, call);
}
catch (err) {
return err.message;
}
};
return {
evaluateExpression: evaluateExpression,
evaluateExpressionSafe: evaluateExpressionSafe
};
})();
module.exports = natspec;

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{
"name": "natspec.js",
"version": "0.0.1",
"description": "Javascript Library used to evaluate natspec expressions",
"main": "natspec.js",
"scripts": {
"build": "cd dist && browserify -r ../natspec.js:natspec -i crypto -o natspec.js && uglifyjs natspec.js --source-map natspec.js.map -c -m -o natspec.min.js",
"test": "mocha",
"test-coveralls": "istanbul cover _mocha -- -R spec && cat coverage/lcov.info | coveralls --verbose"
},
"author": "",
"dependencies": {
"ethereum.js": "ethereum/ethereum.js#master"
},
"devDependencies": {
"browserify": "^9.0.3",
"chai": "^2.1.0",
"coveralls": "^2.11.2",
"istanbul": "^0.3.6",
"mocha": "^2.1.0",
"uglify-js": "^2.4.16"
},
"license": "LGPL-3.0"
}

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var chai = require('chai');
var natspec = require('../natspec.js');
var assert = chai.assert;
describe('natspec', function () {
it('should evaluate simple expression', function () {
// given
var expression = "`x = 1` + `y = 2` will be equal `x + y`";
// when
var result = natspec.evaluateExpression(expression);
var result2 = natspec.evaluateExpressionSafe(expression);
// then
assert.equal(result, "1 + 2 will be equal 3");
assert.equal(result2, "1 + 2 will be equal 3");
});
it('should evalute expression using input params', function () {
//given
var expression = "Will multiply `a` by 7 and return `a * 7`.";
var method = 'multiply';
var abi = [{
"name": "multiply",
"constant": false,
"type": "function",
"inputs": [{
"name": "a",
"type": "uint256"
}],
"outputs": [{
"name": "d",
"type": "uint256"
}]
}];
var transaction = {
"jsonrpc": "2.0",
"method": "eth_call",
"params": [{
"to": "0x8521742d3f456bd237e312d6e30724960f72517a",
"data": "0xc6888fa1000000000000000000000000000000000000000000000000000000000000007a"
}],
"id": 6
};
var call = {
method: method,
abi: abi,
transaction: transaction
};
// when
var result = natspec.evaluateExpression(expression, call);
var result2 = natspec.evaluateExpressionSafe(expression, call);
// then
assert.equal(result, "Will multiply 122 by 7 and return 854.");
assert.equal(result2, "Will multiply 122 by 7 and return 854.");
});
it('should evalute expression using input params', function () {
//given
var expression = "Will multiply `a` by 7 and return `a * 7`.";
var method = 'multiply';
var abi = [{
"name": "multiply",
"constant": false,
"type": "function",
"inputs": [{
"name": "b",
"type": "uint256"
}],
"outputs": [{
"name": "d",
"type": "uint256"
}]
}];
var transaction = {
"jsonrpc": "2.0",
"method": "eth_call",
"params": [{
"to": "0x8521742d3f456bd237e312d6e30724960f72517a",
"data": "0xc6888fa1000000000000000000000000000000000000000000000000000000000000007a"
}],
"id": 6
};
var call = {
method: method,
abi: abi,
transaction: transaction
};
// when
var exceptionThrow = function () { natspec.evaluateExpression(expression, call);}
var result = natspec.evaluateExpressionSafe(expression, call);
// then
assert.equal(result, "Natspec evaluation failed, wrong input params");
assert.throws(exceptionThrow, "Natspec evaluation failed, wrong input params");
});
it('should evalute expression using input params', function () {
//given
var expression = "Will multiply `a` by 7 and return `a * 7`.";
var method = 'multiply2';
var abi = [{
"name": "multiply",
"constant": false,
"type": "function",
"inputs": [{
"name": "a",
"type": "uint256"
}],
"outputs": [{
"name": "d",
"type": "uint256"
}]
}];
var transaction = {
"jsonrpc": "2.0",
"method": "eth_call",
"params": [{
"to": "0x8521742d3f456bd237e312d6e30724960f72517a",
"data": "0xc6888fa1000000000000000000000000000000000000000000000000000000000000007a"
}],
"id": 6
};
var call = {
method: method,
abi: abi,
transaction: transaction
};
// when
var exceptionThrow = function () { natspec.evaluateExpression(expression, call);}
var result = natspec.evaluateExpressionSafe(expression, call);
// then
assert.equal(result, "Natspec evaluation failed, method does not exist");
assert.throws(exceptionThrow, "Natspec evaluation failed, method does not exist");
});
});
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