added helper functions to compute info needed on uri

src/token/erc721/erc721.cairo

@@ -21,7 +21,7 @@ trait IERC721<TState> {
 }
 
 #[starknet::interface]
-trait IERC721Metadata<TState>{
+trait IERC721Metadata<TState> {
  fn token_uri(self: @TState, token_id: u256) -> felt252;
 }
 
@@ -30,7 +30,7 @@ mod ERC721 {
  use array::SpanTrait;
  use StarkBank::token::erc721::interface;
  use option::OptionTrait;
- use starknet::ContractAddress;
+ use starknet::{ContractAddress, contract_address_const};
  use starknet::get_caller_address;
  use zeroable::Zeroable;
 
@@ -75,6 +75,17 @@ mod ERC721 {
  approved: bool
  }
 
+ #[derive::Drop]
+ enum Color {
+ Green: felt252,
+ Orange: felt252,
+ Red: felt252,
+ }
+
+ const RED: felt252 = '#CC0E0E';
+ const GREEN: felt252 = '#0BB534';
+ const ORANGE: felt252 = '#FF903F';
+
  #[constructor]
  fn constructor(
  ref self: ContractState,
@@ -93,7 +104,6 @@ mod ERC721 {
 
  #[external(v0)]
  impl ERC721MetadataImpl of interface::IERC721Metadata<ContractState> {
-
  fn token_uri(self: @ContractState, token_id: u256) -> felt252 {
  assert(self._exists(token_id), 'ERC721: invalid token ID');
  self._token_uri.read(token_id)
@@ -102,7 +112,6 @@ mod ERC721 {
 
  #[external(v0)]
  impl ERC721Impl of interface::IERC721<ContractState> {
-
  fn name(self: @ContractState) -> felt252 {
  self._name.read()
  }
@@ -157,29 +166,33 @@ mod ERC721 {
  );
  self._transfer(from, to, token_id);
  }
-
  }
 
  #[generate_trait]
- impl UriHelper of UriHelperTrait{
-
- fn compute_cr(ref self: ContractState){
-
+ impl UriHelper of UriHelperTrait {
+ fn _compute_cr(ref self: ContractState) -> felt252 {
+ '3.09'
  }
 
- fn compute_collateral(ref self: ContractState){
-
+ fn _compute_collateral(ref self: ContractState) -> felt252 {
+ '152.7'
  }
 
- fn compute_color(ref self: ContractState){
+ fn _compute_color(ref self: ContractState) -> felt252 {
+ let CR: u256 = self._compute_cr().into();
 
+ if (CR <= 1) {
+ RED
+ } else if (CR <= 2) {
+ ORANGE
+ } else {
+ GREEN
+ }
  }
 
- fn compute_address(){
-
+ fn _compute_starkName(ref self: ContractState) -> felt252 {
+ '0xJustGus'
  }
-
-
  }
 
  //
@@ -278,16 +291,26 @@ mod ERC721 {
  self._token_uri.write(token_id, token_uri)
  }
 
- fn _build_token_uri(ref self: ContractState, token_id: u256){
- assert(self._exists(token_id), 'ERC721: invalid token ID');
+ fn _build_token_uri(ref self: ContractState, token_id: u256) {
+ assert(self._exists(token_id), 'ERC721: invalid token ID');
+
+ let color: felt252 = self._compute_color();
+ let CR: felt252 = self._compute_cr();
+ let addr: felt252 = self._compute_starkName();
+ let collateral: felt252 = self._compute_collateral();
+
+
+
+
+
+
+
 
 
 
  }
  }
 }
-
-
 // <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" viewBox="0 0 400 400" preserveAspectRatio="xMidYMid meet">
 // <style type="text/css"><![CDATA[
 // text { font-family: monospace; font-size: 21px; }
@@ -307,3 +330,4 @@ mod ERC721 {
 // 0xF25c288A1FfE4b0a5B90C9cCCDD8E13Bc7c7E685282813F5f9f
 // </text>
 // </svg>
+