Solidity "Events" watcher with javascript


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Describing the syntax of Solidity using BNF

SOURCE: https://github.com/ethereum/solidity/blob/develop/docs/grammar.txt SourceUnit = (PragmaDirective | ImportDirective | ContractDefinition)* // Pragma actually parses anything up to the trailing ';' to be fully forward-compatible. PragmaDirective = 'pragma' Identifier ([^;]+) ';' ImportDirective = 'import' StringLiteral ('as' Identifier)? ';' | 'import' ('*' | Identifier) ('as' Identifier)? 'from' StringLiteral ';' | 'import' '{' Identifier ('as' Identifier)? ( ',' Identifier ('as' Identifier)? )* '}' 'from' StringLiteral ';' ContractDefinition = ( 'contract' | 'library' | 'interface' ) Identifier ( 'is' InheritanceSpecifier (',' InheritanceSpecifier )* )? '{' ContractPart* '}' ContractPart = StateVariableDecla...
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Image Source The rise of blockchain has pushed crypto currencies to the forefront and enabled them to reach more and more people every day.  And while crypto mass adoption has been visible more than ever with currencies like Bitcoin and Ethereum, others didn’t have such an easy time taking off.  Bitcoin accumulation has created an abundance of wealth for those who own it, while Ethereum has provided business opportunities via creations like smart contracts. But there were also cryptocurrencies like Dogecoin and SpaceBit, and, most famously, Ethereum’s DAO that failed quickly after the launch because of unclearly mapped progression paths, bad publicity, security breaches, and unethical behavior.  In that sense, many people believe that the reason for these shortcomings is the absence of regulations and frameworks that prevent bad business practices and malicious behavior. The continued ability to conduct all these activities in the sector, unchecked, has resulted in the cr...
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Crypto-Currency "Coin Contract" Example

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So here is my starting point pragma solidity ^0.4.18; //Used like an Interface in C# or Java contract Token { function totalSupply() public constant returns (uint256 supply) {} function balanceOf(address _owner) public constant returns (uint256 balance) {} function transfer(address _to, uint256 _value) public returns (bool success) {} function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {} function approve(address _spender, uint256 _value) public returns (bool success) {} function allowance(address _owner, address _spender) public constant returns (uint256 remaining) {} //needed to Log the Events event Transfer(address indexed _from, address indexed _to, uint256 _value); event Approval(address indexed _owner, address indexed _spender, uint256 _value); } contract StandardToken is Token { mapping (address => uint256) balances; mapping (address => mapping (address => uint25...
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