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[wip] start making vanillae js library

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It compiles but there's some NYI functions

This is going to have all the common functions that we need all over the place

- base64 encode/decode
- base58 encode/decode
- rlp encode/decode
- transaction types
- transaction formation
- reading stuff from the transaction
- safe type
- (maybe) AWCP

This commit contains a refactored version of my prior base64 implementation,
which is more imperativey and less "trying to fit Erlang into TS".
This commit is contained in:
pharpend
2022-10-19 01:21:41 -06:00
parent ea95e59640
commit 0e95fef840
4 changed files with 326 additions and 0 deletions
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bindings/typescript/.gitignore
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dist
bindings/typescript/jex.eterms
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{type, library}.
{realm, local}.
{name, vanillae}.
{version, "0.1.0"}.
{deps, []}.
bindings/typescript/src/base64.ts
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/**
* Base64 Utility Functions in TypeScript
*/
export {
encode
}
/**
* Encode an array of bytes as a Uint8Array in base64 notation.
*/
function
encode(bytes: Uint8Array): string {
// slice the array
// length of head is a multiple of 3
// treat the tail as a special case
let {head, tail, tail_len} = slice3k(bytes);
let head_str : string = encode_head(head);
let tail_str : string = encode_tail(tail, tail_len);
return head_str + tail_str;
}
type slice3k = {head : Uint8Array,
tail : Uint8Array,
tail_len : number};
/**
* Take a Uint8Array, take the first 3k (k >= 0) bytes, put them in head, and
* the remaining 0,1, or 2 bytes, put them in tail
*
* @internal
*/
function
slice3k(bytes: Uint8Array): slice3k {
let len : number = bytes.length;
// too lazy to look up how to do integer division in js so this will do
let tail_len : number = len % 3;
let head_len : number = len - tail_len;
// for slice:
// first argument is the 0-index of the start
// second - first is the length of the slice
let head : Uint8Array = bytes.slice(0, head_len);
// empty second argument means go to the end
let tail : Uint8Array = bytes.slice(head_len);
return {head : head,
tail : tail,
tail_len : tail_len};
}
/**
* Encode a Uint8Array whose length is known to be a multiple of 3
*
* @internal
*/
function
encode_head(head_bytes: Uint8Array): string {
// can assume length of bytes is a multiple of 3
// start index at 0
// increment by 3
let head_bytes_len : number = head_bytes.length;
let max_idx0 : number = head_bytes_len - 1;
let head_str_acc : string = '';
for(let this_3slice_start_idx0 = 0;
this_3slice_start_idx0 <= max_idx0;
this_3slice_start_idx0 += 3)
{
let this_3slice_bytes : Uint8Array = head_bytes.slice(this_3slice_start_idx0, this_3slice_start_idx0 + 3);
let this_3slice_str : string = encode3(this_3slice_bytes);
head_str_acc += this_3slice_str;
}
return head_str_acc;
}
/**
* Encode a 3 bytes into base64 notation
*
* @internal
*/
function
encode3(bytes: Uint8Array) {
let b0 : number = bytes[0];
let b1 : number = bytes[1];
let b2 : number = bytes[2];
// ABCDEFGH 12345678 ABCDEFGH
// b0 b1 b2
// ABCDEF GH1234 5678AB CDEFGH
// n0 n1 n2 n3
let n0 : number = b0 >> 2;
// n1 = 00GH1234
// b0 = ABCDEFGH
// 4 = 00000100
// b0 % 4 = 000000GH
// (b0 % 4) << 4 = 00GH0000
// b1 = 12345678
// b1 >> 4 = 00001234
let n1 : number = ((b0 % 4) << 4) + (b1 >> 4);
// n2 = 005678AB
// b1 = 12345678
// 16 = 00010000
// b1 % 16 = 00005678
// (b1 % 16) << 2 = 00567800
// b1 = ABCDEFGH
// b1 >> 6 = 000000AB
let n2 : number = ((b1 % 16) << 2) + (b1 >> 6);
// n3 = 00CDEFGH
// 64 = 01000000
// b2 = ABCDEFGH
let n3 : number = b2 % 64;
// convert to chars
let s0 : string = int2char(n0);
let s1 : string = int2char(n1);
let s2 : string = int2char(n2);
let s3 : string = int2char(n3);
// retrvn
return s0 + s1 + s2 + s3;
}
/**
* Encode the final 0, 1, or 2 bytes
*
* FIXME: nyi
*/
function
encode_tail(tail_bytes : Uint8Array,
tail_len : number)
: string
{
throw new Error('nyi');
}
/**
* Conversion table for base64 encode
*
* @internal
*/
function
int2char(n: number): string
{
switch(n) {
case 0: return 'A';
case 1: return 'B';
case 2: return 'C';
case 3: return 'D';
case 4: return 'E';
case 5: return 'F';
case 6: return 'G';
case 7: return 'H';
case 8: return 'I';
case 9: return 'J';
case 10: return 'K';
case 11: return 'L';
case 12: return 'M';
case 13: return 'N';
case 14: return 'O';
case 15: return 'P';
case 16: return 'Q';
case 17: return 'R';
case 18: return 'S';
case 19: return 'T';
case 20: return 'U';
case 21: return 'V';
case 22: return 'W';
case 23: return 'X';
case 24: return 'Y';
case 25: return 'Z';
case 26: return 'a';
case 27: return 'b';
case 28: return 'c';
case 29: return 'd';
case 30: return 'e';
case 31: return 'f';
case 32: return 'g';
case 33: return 'h';
case 34: return 'i';
case 35: return 'j';
case 36: return 'k';
case 37: return 'l';
case 38: return 'm';
case 39: return 'n';
case 40: return 'o';
case 41: return 'p';
case 42: return 'q';
case 43: return 'r';
case 44: return 's';
case 45: return 't';
case 46: return 'u';
case 47: return 'v';
case 48: return 'w';
case 49: return 'x';
case 50: return 'y';
case 51: return 'z';
case 52: return '0';
case 53: return '1';
case 54: return '2';
case 55: return '3';
case 56: return '4';
case 57: return '5';
case 58: return '6';
case 59: return '7';
case 60: return '8';
case 61: return '9';
case 62: return '+';
case 63: return '/';
default: throw new Error("invalid base64 encode byte: " + n);
}
}
/**
* Conversion table for base64 decode
*
* @internal
*/
function
char2int(s: string): number
{
switch(s) {
case 'A': return 0;
case 'B': return 1;
case 'C': return 2;
case 'D': return 3;
case 'E': return 4;
case 'F': return 5;
case 'G': return 6;
case 'H': return 7;
case 'I': return 8;
case 'J': return 9;
case 'K': return 10;
case 'L': return 11;
case 'M': return 12;
case 'N': return 13;
case 'O': return 14;
case 'P': return 15;
case 'Q': return 16;
case 'R': return 17;
case 'S': return 18;
case 'T': return 19;
case 'U': return 20;
case 'V': return 21;
case 'W': return 22;
case 'X': return 23;
case 'Y': return 24;
case 'Z': return 25;
case 'a': return 26;
case 'b': return 27;
case 'c': return 28;
case 'd': return 29;
case 'e': return 30;
case 'f': return 31;
case 'g': return 32;
case 'h': return 33;
case 'i': return 34;
case 'j': return 35;
case 'k': return 36;
case 'l': return 37;
case 'm': return 38;
case 'n': return 39;
case 'o': return 40;
case 'p': return 41;
case 'q': return 42;
case 'r': return 43;
case 's': return 44;
case 't': return 45;
case 'u': return 46;
case 'v': return 47;
case 'w': return 48;
case 'x': return 49;
case 'y': return 50;
case 'z': return 51;
case '0': return 52;
case '1': return 53;
case '2': return 54;
case '3': return 55;
case '4': return 56;
case '5': return 57;
case '6': return 58;
case '7': return 59;
case '8': return 60;
case '9': return 61;
case '+': return 62;
case '/': return 63;
default: throw new Error("invalid base64 character: " + s);
}
}
bindings/typescript/tsconfig.json
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{"compilerOptions" : {"target" : "es2022",
"strict" : true,
"esModuleInterop" : true,
"skipLibCheck" : true,
"forceConsistentCasingInFileNames" : true,
"noImplicitAny" : true,
"strictNullChecks" : true,
"strictPropertyInitialization" : true,
"sourceMap" : true,
"outDir" : "dist",
"declaration" : true},
"$schema" : "https://json.schemastore.org/tsconfig",
"display" : "Recommended",
"include" : ["src/**/*"],
"exclude" : ["src/jex_include"],
"composite" : true}