/
builder_utils.ts
351 lines (313 loc) · 8.88 KB
/
builder_utils.ts
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// Copyright (c) Aptos
// SPDX-License-Identifier: Apache-2.0
import { HexString } from "../hex_string";
import {
TypeTag,
TypeTagBool,
TypeTagU8,
TypeTagU64,
TypeTagU128,
TypeTagAddress,
AccountAddress,
TypeTagVector,
TypeTagStruct,
StructTag,
Identifier,
TransactionArgument,
TransactionArgumentBool,
TransactionArgumentU64,
TransactionArgumentU128,
TransactionArgumentAddress,
TransactionArgumentU8,
TransactionArgumentU8Vector,
} from "../aptos_types";
import { Serializer } from "../bcs";
function assertType(val: any, types: string[] | string, message?: string) {
if (!types?.includes(typeof val)) {
throw new Error(
message || `Invalid arg: ${val} type should be ${types instanceof Array ? types.join(" or ") : types}`,
);
}
}
function bail(message: string) {
throw new Error(message);
}
function isWhiteSpace(c: string): boolean {
if (c.match(/\s/)) {
return true;
}
return false;
}
function isValidAlphabetic(c: string): boolean {
if (c.match(/[_A-Za-z0-9]/g)) {
return true;
}
return false;
}
type TokenType = string;
type TokenValue = string;
type Token = [TokenType, TokenValue];
// Returns Token and Token byte size
function nextToken(tagStr: string, pos: number): [Token, number] {
const c = tagStr[pos];
if (c === ":") {
if (tagStr.slice(pos, pos + 2) === "::") {
return [["COLON", "::"], 2];
}
bail("Unrecognized token.");
} else if (c === "<") {
return [["LT", "<"], 1];
} else if (c === ">") {
return [["GT", ">"], 1];
} else if (c === ",") {
return [["COMMA", ","], 1];
} else if (isWhiteSpace(c)) {
let res = "";
for (let i = pos; i < tagStr.length; i += 1) {
const char = tagStr[i];
if (isWhiteSpace(char)) {
res = `${res}${char}`;
} else {
break;
}
}
return [["SPACE", res], res.length];
} else if (isValidAlphabetic(c)) {
let res = "";
for (let i = pos; i < tagStr.length; i += 1) {
const char = tagStr[i];
if (isValidAlphabetic(char)) {
res = `${res}${char}`;
} else {
break;
}
}
return [["IDENT", res], res.length];
}
throw new Error("Unrecognized token.");
}
function tokenize(tagStr: string): Token[] {
let pos = 0;
const tokens = [];
while (pos < tagStr.length) {
const [token, size] = nextToken(tagStr, pos);
if (token[0] !== "SPACE") {
tokens.push(token);
}
pos += size;
}
return tokens;
}
/**
* Parser to parse a type tag string
*/
export class TypeTagParser {
private readonly tokens: Token[];
constructor(tagStr: string) {
this.tokens = tokenize(tagStr);
}
private consume(targetToken: string) {
const token = this.tokens.shift();
if (!token || token[1] !== targetToken) {
bail("Invalid type tag.");
}
}
private parseCommaList(endToken: TokenValue, allowTraillingComma: boolean): TypeTag[] {
const res: TypeTag[] = [];
if (this.tokens.length <= 0) {
bail("Invalid type tag.");
}
while (this.tokens[0][1] !== endToken) {
res.push(this.parseTypeTag());
if (this.tokens.length > 0 && this.tokens[0][1] === endToken) {
break;
}
this.consume(",");
if (this.tokens.length > 0 && this.tokens[0][1] === endToken && allowTraillingComma) {
break;
}
if (this.tokens.length <= 0) {
bail("Invalid type tag.");
}
}
return res;
}
parseTypeTag(): TypeTag {
if (this.tokens.length === 0) {
bail("Invalid type tag.");
}
// Pop left most element out
const [tokenTy, tokenVal] = this.tokens.shift();
if (tokenVal === "u8") {
return new TypeTagU8();
}
if (tokenVal === "u64") {
return new TypeTagU64();
}
if (tokenVal === "u128") {
return new TypeTagU128();
}
if (tokenVal === "bool") {
return new TypeTagBool();
}
if (tokenVal === "address") {
return new TypeTagAddress();
}
if (tokenVal === "vector") {
this.consume("<");
const res = this.parseTypeTag();
this.consume(">");
return new TypeTagVector(res);
}
if (tokenTy === "IDENT" && (tokenVal.startsWith("0x") || tokenVal.startsWith("0X"))) {
const address = tokenVal;
this.consume("::");
const [moduleTokenTy, module] = this.tokens.shift();
if (moduleTokenTy !== "IDENT") {
bail("Invalid type tag.");
}
this.consume("::");
const [nameTokenTy, name] = this.tokens.shift();
if (nameTokenTy !== "IDENT") {
bail("Invalid type tag.");
}
let tyTags: TypeTag[] = [];
// Check if the struct has ty args
if (this.tokens.length > 0 && this.tokens[0][1] === "<") {
this.consume("<");
tyTags = this.parseCommaList(">", true);
this.consume(">");
}
const structTag = new StructTag(
AccountAddress.fromHex(address),
new Identifier(module),
new Identifier(name),
tyTags,
);
return new TypeTagStruct(structTag);
}
throw new Error("Invalid type tag.");
}
}
export function ensureBoolean(val: boolean | string): boolean {
assertType(val, ["boolean", "string"]);
if (typeof val === "boolean") {
return val;
}
if (val === "true") {
return true;
}
if (val === "false") {
return false;
}
throw new Error("Invalid boolean string.");
}
export function ensureNumber(val: number | string): number {
assertType(val, ["number", "string"]);
if (typeof val === "number") {
return val;
}
const res = Number.parseInt(val, 10);
if (Number.isNaN(res)) {
throw new Error("Invalid number string.");
}
return res;
}
export function ensureBigInt(val: number | bigint | string): bigint {
assertType(val, ["number", "bigint", "string"]);
return BigInt(val);
}
export function serializeArg(argVal: any, argType: TypeTag, serializer: Serializer) {
if (argType instanceof TypeTagBool) {
serializer.serializeBool(ensureBoolean(argVal));
return;
}
if (argType instanceof TypeTagU8) {
serializer.serializeU8(ensureNumber(argVal));
return;
}
if (argType instanceof TypeTagU64) {
serializer.serializeU64(ensureBigInt(argVal));
return;
}
if (argType instanceof TypeTagU128) {
serializer.serializeU128(ensureBigInt(argVal));
return;
}
if (argType instanceof TypeTagAddress) {
let addr: AccountAddress;
if (typeof argVal === "string" || argVal instanceof HexString) {
addr = AccountAddress.fromHex(argVal);
} else if (argVal instanceof AccountAddress) {
addr = argVal;
} else {
throw new Error("Invalid account address.");
}
addr.serialize(serializer);
return;
}
if (argType instanceof TypeTagVector) {
// We are serializing a vector<u8>
if (argType.value instanceof TypeTagU8) {
if (argVal instanceof Uint8Array) {
serializer.serializeBytes(argVal);
return;
}
if (typeof argVal === "string") {
serializer.serializeStr(argVal);
return;
}
}
if (!(argVal instanceof Array)) {
throw new Error("Invalid vector args.");
}
serializer.serializeU32AsUleb128(argVal.length);
argVal.forEach((arg) => serializeArg(arg, argType.value, serializer));
return;
}
if (argType instanceof TypeTagStruct) {
const { address, module_name: moduleName, name } = (argType as TypeTagStruct).value;
if (
`${HexString.fromUint8Array(address.address).toShortString()}::${moduleName.value}::${name.value}` !==
"0x1::string::String"
) {
throw new Error("The only supported struct arg is of type 0x1::string::String");
}
assertType(argVal, ["string"]);
serializer.serializeStr(argVal);
return;
}
throw new Error("Unsupported arg type.");
}
export function argToTransactionArgument(argVal: any, argType: TypeTag): TransactionArgument {
if (argType instanceof TypeTagBool) {
return new TransactionArgumentBool(ensureBoolean(argVal));
}
if (argType instanceof TypeTagU8) {
return new TransactionArgumentU8(ensureNumber(argVal));
}
if (argType instanceof TypeTagU64) {
return new TransactionArgumentU64(ensureBigInt(argVal));
}
if (argType instanceof TypeTagU128) {
return new TransactionArgumentU128(ensureBigInt(argVal));
}
if (argType instanceof TypeTagAddress) {
let addr: AccountAddress;
if (typeof argVal === "string" || argVal instanceof HexString) {
addr = AccountAddress.fromHex(argVal);
} else if (argVal instanceof AccountAddress) {
addr = argVal;
} else {
throw new Error("Invalid account address.");
}
return new TransactionArgumentAddress(addr);
}
if (argType instanceof TypeTagVector && argType.value instanceof TypeTagU8) {
if (!(argVal instanceof Uint8Array)) {
throw new Error(`${argVal} should be an instance of Uint8Array`);
}
return new TransactionArgumentU8Vector(argVal);
}
throw new Error("Unknown type for TransactionArgument.");
}