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/**
* A fragment is a single item from an ABI, which may represent any of:
*
* - [Functions](FunctionFragment)
* - [Events](EventFragment)
* - [Constructors](ConstructorFragment)
* - Custom [Errors](ErrorFragment)
* - [Fallback or Receive](FallbackFragment) functions
*
* @_subsection api/abi/abi-coder:Fragments [about-fragments]
*/
import {
defineProperties, getBigInt, getNumber,
assert, assertPrivate, assertArgument
} from "../utils/index.js";
import { id } from "../hash/index.js";
/**
* A Type description in a [JSON ABI format](link-solc-jsonabi).
*/
export interface JsonFragmentType {
/**
* The parameter name.
*/
readonly name?: string;
/**
* If the parameter is indexed.
*/
readonly indexed?: boolean;
/**
* The type of the parameter.
*/
readonly type?: string;
/**
* The internal Solidity type.
*/
readonly internalType?: string;
/**
* The components for a tuple.
*/
readonly components?: ReadonlyArray<JsonFragmentType>;
}
/**
* A fragment for a method, event or error in a [JSON ABI format](link-solc-jsonabi).
*/
export interface JsonFragment {
/**
* The name of the error, event, function, etc.
*/
readonly name?: string;
/**
* The type of the fragment (e.g. ``event``, ``"function"``, etc.)
*/
readonly type?: string;
/**
* If the event is anonymous.
*/
readonly anonymous?: boolean;
/**
* If the function is payable.
*/
readonly payable?: boolean;
/**
* If the function is constant.
*/
readonly constant?: boolean;
/**
* The mutability state of the function.
*/
readonly stateMutability?: string;
/**
* The input parameters.
*/
readonly inputs?: ReadonlyArray<JsonFragmentType>;
/**
* The output parameters.
*/
readonly outputs?: ReadonlyArray<JsonFragmentType>;
/**
* The gas limit to use when sending a transaction for this function.
*/
readonly gas?: string;
};
/**
* The format to serialize the output as.
*
* **``"sighash"``** - the bare formatting, used to compute the selector
* or topic hash; this format cannot be reversed (as it discards ``indexed``)
* so cannot by used to export an [[Interface]].
*
* **``"minimal"``** - Human-Readable ABI with minimal spacing and without
* names, so it is compact, but will result in Result objects that cannot
* be accessed by name.
*
* **``"full"``** - Full Human-Readable ABI, with readable spacing and names
* intact; this is generally the recommended format.
*
* **``"json"``** - The [JSON ABI format](link-solc-jsonabi).
*/
export type FormatType = "sighash" | "minimal" | "full" | "json";
// [ "a", "b" ] => { "a": 1, "b": 1 }
function setify(items: Array<string>): ReadonlySet<string> {
const result: Set<string> = new Set();
items.forEach((k) => result.add(k));
return Object.freeze(result);
}
const _kwVisibDeploy = "external public payable override";
const KwVisibDeploy = setify(_kwVisibDeploy.split(" "));
// Visibility Keywords
const _kwVisib = "constant external internal payable private public pure view override";
const KwVisib = setify(_kwVisib.split(" "));
const _kwTypes = "constructor error event fallback function receive struct";
const KwTypes = setify(_kwTypes.split(" "));
const _kwModifiers = "calldata memory storage payable indexed";
const KwModifiers = setify(_kwModifiers.split(" "));
const _kwOther = "tuple returns";
// All Keywords
const _keywords = [ _kwTypes, _kwModifiers, _kwOther, _kwVisib ].join(" ");
const Keywords = setify(_keywords.split(" "));
// Single character tokens
const SimpleTokens: Record<string, string> = {
"(": "OPEN_PAREN", ")": "CLOSE_PAREN",
"[": "OPEN_BRACKET", "]": "CLOSE_BRACKET",
",": "COMMA", "@": "AT"
};
// Parser regexes to consume the next token
const regexWhitespacePrefix = new RegExp("^(\\s*)");
const regexNumberPrefix = new RegExp("^([0-9]+)");
const regexIdPrefix = new RegExp("^([a-zA-Z$_][a-zA-Z0-9$_]*)");
// Parser regexs to check validity
const regexId = new RegExp("^([a-zA-Z$_][a-zA-Z0-9$_]*)$");
const regexType = new RegExp("^(address|bool|bytes([0-9]*)|string|u?int([0-9]*))$");
/**
* @ignore:
*/
type Token = Readonly<{
// Type of token (e.g. TYPE, KEYWORD, NUMBER, etc)
type: string;
// Offset into the original source code
offset: number;
// Actual text content of the token
text: string;
// The parenthesis depth
depth: number;
// If a parenthesis, the offset (in tokens) that balances it
match: number;
// For parenthesis and commas, the offset (in tokens) to the
// previous/next parenthesis or comma in the list
linkBack: number;
linkNext: number;
// If a BRACKET, the value inside
value: number;
}>;
class TokenString {
#offset: number;
#tokens: ReadonlyArray<Token>;
get offset(): number { return this.#offset; }
get length(): number { return this.#tokens.length - this.#offset; }
constructor(tokens: ReadonlyArray<Token>) {
this.#offset = 0;
this.#tokens = tokens.slice();
}
clone(): TokenString { return new TokenString(this.#tokens); }
reset(): void { this.#offset = 0; }
#subTokenString(from: number = 0, to: number = 0): TokenString {
return new TokenString(this.#tokens.slice(from, to).map((t) => {
return Object.freeze(Object.assign({ }, t, {
match: (t.match - from),
linkBack: (t.linkBack - from),
linkNext: (t.linkNext - from),
}));
}));
}
// Pops and returns the value of the next token, if it is a keyword in allowed; throws if out of tokens
popKeyword(allowed: ReadonlySet<string>): string {
const top = this.peek();
if (top.type !== "KEYWORD" || !allowed.has(top.text)) { throw new Error(`expected keyword ${ top.text }`); }
return this.pop().text;
}
// Pops and returns the value of the next token if it is `type`; throws if out of tokens
popType(type: string): string {
if (this.peek().type !== type) {
const top = this.peek();
throw new Error(`expected ${ type }; got ${ top.type } ${ JSON.stringify(top.text) }`);
}
return this.pop().text;
}
// Pops and returns a "(" TOKENS ")"
popParen(): TokenString {
const top = this.peek();
if (top.type !== "OPEN_PAREN") { throw new Error("bad start"); }
const result = this.#subTokenString(this.#offset + 1, top.match + 1);
this.#offset = top.match + 1;
return result;
}
// Pops and returns the items within "(" ITEM1 "," ITEM2 "," ... ")"
popParams(): Array<TokenString> {
const top = this.peek();
if (top.type !== "OPEN_PAREN") { throw new Error("bad start"); }
const result: Array<TokenString> = [ ];
while(this.#offset < top.match - 1) {
const link = this.peek().linkNext;
result.push(this.#subTokenString(this.#offset + 1, link));
this.#offset = link;
}
this.#offset = top.match + 1;
return result;
}
// Returns the top Token, throwing if out of tokens
peek(): Token {
if (this.#offset >= this.#tokens.length) {
throw new Error("out-of-bounds");
}
return this.#tokens[this.#offset];
}
// Returns the next value, if it is a keyword in `allowed`
peekKeyword(allowed: ReadonlySet<string>): null | string {
const top = this.peekType("KEYWORD");
return (top != null && allowed.has(top)) ? top: null;
}
// Returns the value of the next token if it is `type`
peekType(type: string): null | string {
if (this.length === 0) { return null; }
const top = this.peek();
return (top.type === type) ? top.text: null;
}
// Returns the next token; throws if out of tokens
pop(): Token {
const result = this.peek();
this.#offset++;
return result;
}
toString(): string {
const tokens: Array<string> = [ ];
for (let i = this.#offset; i < this.#tokens.length; i++) {
const token = this.#tokens[i];
tokens.push(`${ token.type }:${ token.text }`);
}
return `<TokenString ${ tokens.join(" ") }>`
}
}
type Writeable<T> = { -readonly [P in keyof T]: T[P] };
function lex(text: string): TokenString {
const tokens: Array<Token> = [ ];
const throwError = (message: string) => {
const token = (offset < text.length) ? JSON.stringify(text[offset]): "$EOI";
throw new Error(`invalid token ${ token } at ${ offset }: ${ message }`);
};
let brackets: Array<number> = [ ];
let commas: Array<number> = [ ];
let offset = 0;
while (offset < text.length) {
// Strip off any leading whitespace
let cur = text.substring(offset);
let match = cur.match(regexWhitespacePrefix);
if (match) {
offset += match[1].length;
cur = text.substring(offset);
}
const token = { depth: brackets.length, linkBack: -1, linkNext: -1, match: -1, type: "", text: "", offset, value: -1 };
tokens.push(token);
let type = (SimpleTokens[cur[0]] || "");
if (type) {
token.type = type;
token.text = cur[0];
offset++;
if (type === "OPEN_PAREN") {
brackets.push(tokens.length - 1);
commas.push(tokens.length - 1);
} else if (type == "CLOSE_PAREN") {
if (brackets.length === 0) { throwError("no matching open bracket"); }
token.match = brackets.pop() as number;
(<Writeable<Token>>(tokens[token.match])).match = tokens.length - 1;
token.depth--;
token.linkBack = commas.pop() as number;
(<Writeable<Token>>(tokens[token.linkBack])).linkNext = tokens.length - 1;
} else if (type === "COMMA") {
token.linkBack = commas.pop() as number;
(<Writeable<Token>>(tokens[token.linkBack])).linkNext = tokens.length - 1;
commas.push(tokens.length - 1);
} else if (type === "OPEN_BRACKET") {
token.type = "BRACKET";
} else if (type === "CLOSE_BRACKET") {
// Remove the CLOSE_BRACKET
let suffix = (tokens.pop() as Token).text;
if (tokens.length > 0 && tokens[tokens.length - 1].type === "NUMBER") {
const value = (tokens.pop() as Token).text;
suffix = value + suffix;
(<Writeable<Token>>(tokens[tokens.length - 1])).value = getNumber(value);
}
if (tokens.length === 0 || tokens[tokens.length - 1].type !== "BRACKET") {
throw new Error("missing opening bracket");
}
(<Writeable<Token>>(tokens[tokens.length - 1])).text += suffix;
}
continue;
}
match = cur.match(regexIdPrefix);
if (match) {
token.text = match[1];
offset += token.text.length;
if (Keywords.has(token.text)) {
token.type = "KEYWORD";
continue;
}
if (token.text.match(regexType)) {
token.type = "TYPE";
continue;
}
token.type = "ID";
continue;
}
match = cur.match(regexNumberPrefix);
if (match) {
token.text = match[1];
token.type = "NUMBER";
offset += token.text.length;
continue;
}
throw new Error(`unexpected token ${ JSON.stringify(cur[0]) } at position ${ offset }`);
}
return new TokenString(tokens.map((t) => Object.freeze(t)));
}
// Check only one of `allowed` is in `set`
function allowSingle(set: ReadonlySet<string>, allowed: ReadonlySet<string>): void {
let included: Array<string> = [ ];
for (const key in allowed.keys()) {
if (set.has(key)) { included.push(key); }
}
if (included.length > 1) { throw new Error(`conflicting types: ${ included.join(", ") }`); }
}
// Functions to process a Solidity Signature TokenString from left-to-right for...
// ...the name with an optional type, returning the name
function consumeName(type: string, tokens: TokenString): string {
if (tokens.peekKeyword(KwTypes)) {
const keyword = tokens.pop().text;
if (keyword !== type) {
throw new Error(`expected ${ type }, got ${ keyword }`);
}
}
return tokens.popType("ID");
}
// ...all keywords matching allowed, returning the keywords
function consumeKeywords(tokens: TokenString, allowed?: ReadonlySet<string>): ReadonlySet<string> {
const keywords: Set<string> = new Set();
while (true) {
const keyword = tokens.peekType("KEYWORD");
if (keyword == null || (allowed && !allowed.has(keyword))) { break; }
tokens.pop();
if (keywords.has(keyword)) { throw new Error(`duplicate keywords: ${ JSON.stringify(keyword) }`); }
keywords.add(keyword);
}
return Object.freeze(keywords);
}
// ...all visibility keywords, returning the coalesced mutability
function consumeMutability(tokens: TokenString): "payable" | "nonpayable" | "view" | "pure" {
let modifiers = consumeKeywords(tokens, KwVisib);
// Detect conflicting modifiers
allowSingle(modifiers, setify("constant payable nonpayable".split(" ")));
allowSingle(modifiers, setify("pure view payable nonpayable".split(" ")));
// Process mutability states
if (modifiers.has("view")) { return "view"; }
if (modifiers.has("pure")) { return "pure"; }
if (modifiers.has("payable")) { return "payable"; }
if (modifiers.has("nonpayable")) { return "nonpayable"; }
// Process legacy `constant` last
if (modifiers.has("constant")) { return "view"; }
return "nonpayable";
}
// ...a parameter list, returning the ParamType list
function consumeParams(tokens: TokenString, allowIndexed?: boolean): Array<ParamType> {
return tokens.popParams().map((t) => ParamType.from(t, allowIndexed));
}
// ...a gas limit, returning a BigNumber or null if none
function consumeGas(tokens: TokenString): null | bigint {
if (tokens.peekType("AT")) {
tokens.pop();
if (tokens.peekType("NUMBER")) {
return getBigInt(tokens.pop().text);
}
throw new Error("invalid gas");
}
return null;
}
function consumeEoi(tokens: TokenString): void {
if (tokens.length) {
throw new Error(`unexpected tokens at offset ${ tokens.offset }: ${ tokens.toString() }`);
}
}
const regexArrayType = new RegExp(/^(.*)\[([0-9]*)\]$/);
function verifyBasicType(type: string): string {
const match = type.match(regexType);
assertArgument(match, "invalid type", "type", type);
if (type === "uint") { return "uint256"; }
if (type === "int") { return "int256"; }
if (match[2]) {
// bytesXX
const length = parseInt(match[2]);
assertArgument(length !== 0 && length <= 32, "invalid bytes length", "type", type);
} else if (match[3]) {
// intXX or uintXX
const size = parseInt(match[3] as string);
assertArgument(size !== 0 && size <= 256 && (size % 8) === 0, "invalid numeric width", "type", type);
}
return type;
}
// Make the Fragment constructors effectively private
const _guard = { };
/**
* When [walking](ParamType-walk) a [[ParamType]], this is called
* on each component.
*/
export type ParamTypeWalkFunc = (type: string, value: any) => any;
/**
* When [walking asynchronously](ParamType-walkAsync) a [[ParamType]],
* this is called on each component.
*/
export type ParamTypeWalkAsyncFunc = (type: string, value: any) => any | Promise<any>;
const internal = Symbol.for("_ethers_internal");
const ParamTypeInternal = "_ParamTypeInternal";
const ErrorFragmentInternal = "_ErrorInternal";
const EventFragmentInternal = "_EventInternal";
const ConstructorFragmentInternal = "_ConstructorInternal";
const FallbackFragmentInternal = "_FallbackInternal";
const FunctionFragmentInternal = "_FunctionInternal";
const StructFragmentInternal = "_StructInternal";
/**
* Each input and output of a [[Fragment]] is an Array of **ParamType**.
*/
export class ParamType {
/**
* The local name of the parameter (or ``""`` if unbound)
*/
readonly name!: string;
/**
* The fully qualified type (e.g. ``"address"``, ``"tuple(address)"``,
* ``"uint256[3][]"``)
*/
readonly type!: string;
/**
* The base type (e.g. ``"address"``, ``"tuple"``, ``"array"``)
*/
readonly baseType!: string;
/**
* True if the parameters is indexed.
*
* For non-indexable types this is ``null``.
*/
readonly indexed!: null | boolean;
/**
* The components for the tuple.
*
* For non-tuple types this is ``null``.
*/
readonly components!: null | ReadonlyArray<ParamType>;
/**
* The array length, or ``-1`` for dynamic-lengthed arrays.
*
* For non-array types this is ``null``.
*/
readonly arrayLength!: null | number;
/**
* The type of each child in the array.
*
* For non-array types this is ``null``.
*/
readonly arrayChildren!: null | ParamType;
/**
* @private
*/
constructor(guard: any, name: string, type: string, baseType: string, indexed: null | boolean, components: null | ReadonlyArray<ParamType>, arrayLength: null | number, arrayChildren: null | ParamType) {
assertPrivate(guard, _guard, "ParamType");
Object.defineProperty(this, internal, { value: ParamTypeInternal });
if (components) { components = Object.freeze(components.slice()); }
if (baseType === "array") {
if (arrayLength == null || arrayChildren == null) {
throw new Error("");
}
} else if (arrayLength != null || arrayChildren != null) {
throw new Error("");
}
if (baseType === "tuple") {
if (components == null) { throw new Error(""); }
} else if (components != null) {
throw new Error("");
}
defineProperties<ParamType>(this, {
name, type, baseType, indexed, components, arrayLength, arrayChildren
});
}
/**
* Return a string representation of this type.
*
* For example,
*
* ``sighash" => "(uint256,address)"``
*
* ``"minimal" => "tuple(uint256,address) indexed"``
*
* ``"full" => "tuple(uint256 foo, address bar) indexed baz"``
*/
format(format?: FormatType): string {
if (format == null) { format = "sighash"; }
if (format === "json") {
const name = this.name || "";
if (this.isArray()) {
const result = JSON.parse(this.arrayChildren.format("json"));
result.name = name;
result.type += `[${ (this.arrayLength < 0 ? "": String(this.arrayLength)) }]`;
return JSON.stringify(result);
}
const result: any = {
type: ((this.baseType === "tuple") ? "tuple": this.type),
name
};
if (typeof(this.indexed) === "boolean") { result.indexed = this.indexed; }
if (this.isTuple()) {
result.components = this.components.map((c) => JSON.parse(c.format(format)));
}
return JSON.stringify(result);
}
let result = "";
// Array
if (this.isArray()) {
result += this.arrayChildren.format(format);
result += `[${ (this.arrayLength < 0 ? "": String(this.arrayLength)) }]`;
} else {
if (this.isTuple()) {
result += "(" + this.components.map(
(comp) => comp.format(format)
).join((format === "full") ? ", ": ",") + ")";
} else {
result += this.type;
}
}
if (format !== "sighash") {
if (this.indexed === true) { result += " indexed"; }
if (format === "full" && this.name) {
result += " " + this.name;
}
}
return result;
}
/**
* Returns true if %%this%% is an Array type.
*
* This provides a type gaurd ensuring that [[arrayChildren]]
* and [[arrayLength]] are non-null.
*/
isArray(): this is (ParamType & { arrayChildren: ParamType, arrayLength: number }) {
return (this.baseType === "array")
}
/**
* Returns true if %%this%% is a Tuple type.
*
* This provides a type gaurd ensuring that [[components]]
* is non-null.
*/
isTuple(): this is (ParamType & { components: ReadonlyArray<ParamType> }) {
return (this.baseType === "tuple");
}
/**
* Returns true if %%this%% is an Indexable type.
*
* This provides a type gaurd ensuring that [[indexed]]
* is non-null.
*/
isIndexable(): this is (ParamType & { indexed: boolean }) {
return (this.indexed != null);
}
/**
* Walks the **ParamType** with %%value%%, calling %%process%%
* on each type, destructing the %%value%% recursively.
*/
walk(value: any, process: ParamTypeWalkFunc): any {
if (this.isArray()) {
if (!Array.isArray(value)) { throw new Error("invalid array value"); }
if (this.arrayLength !== -1 && value.length !== this.arrayLength) {
throw new Error("array is wrong length");
}
const _this = this;
return value.map((v) => (_this.arrayChildren.walk(v, process)));
}
if (this.isTuple()) {
if (!Array.isArray(value)) { throw new Error("invalid tuple value"); }
if (value.length !== this.components.length) {
throw new Error("array is wrong length");
}
const _this = this;
return value.map((v, i) => (_this.components[i].walk(v, process)));
}
return process(this.type, value);
}
#walkAsync(promises: Array<Promise<void>>, value: any, process: ParamTypeWalkAsyncFunc, setValue: (value: any) => void): void {
if (this.isArray()) {
if (!Array.isArray(value)) { throw new Error("invalid array value"); }
if (this.arrayLength !== -1 && value.length !== this.arrayLength) {
throw new Error("array is wrong length");
}
const childType = this.arrayChildren;
const result = value.slice();
result.forEach((value, index) => {
childType.#walkAsync(promises, value, process, (value: any) => {
result[index] = value;
});
});
setValue(result);
return;
}
if (this.isTuple()) {
const components = this.components;
// Convert the object into an array
let result: Array<any>;
if (Array.isArray(value)) {
result = value.slice();
} else {
if (value == null || typeof(value) !== "object") {
throw new Error("invalid tuple value");
}
result = components.map((param) => {
if (!param.name) { throw new Error("cannot use object value with unnamed components"); }
if (!(param.name in value)) {
throw new Error(`missing value for component ${ param.name }`);
}
return value[param.name];
});
}
if (result.length !== this.components.length) {
throw new Error("array is wrong length");
}
result.forEach((value, index) => {
components[index].#walkAsync(promises, value, process, (value: any) => {
result[index] = value;
});
});
setValue(result);
return;
}
const result = process(this.type, value);
if (result.then) {
promises.push((async function() { setValue(await result); })());
} else {
setValue(result);
}
}
/**
* Walks the **ParamType** with %%value%%, asynchronously calling
* %%process%% on each type, destructing the %%value%% recursively.
*
* This can be used to resolve ENS names by walking and resolving each
* ``"address"`` type.
*/
async walkAsync(value: any, process: ParamTypeWalkAsyncFunc): Promise<any> {
const promises: Array<Promise<void>> = [ ];
const result: [ any ] = [ value ];
this.#walkAsync(promises, value, process, (value: any) => {
result[0] = value;
});
if (promises.length) { await Promise.all(promises); }
return result[0];
}
/**
* Creates a new **ParamType** for %%obj%%.
*
* If %%allowIndexed%% then the ``indexed`` keyword is permitted,
* otherwise the ``indexed`` keyword will throw an error.
*/
static from(obj: any, allowIndexed?: boolean): ParamType {
if (ParamType.isParamType(obj)) { return obj; }
if (typeof(obj) === "string") {
try {
return ParamType.from(lex(obj), allowIndexed);
} catch (error) {
assertArgument(false, "invalid param type", "obj", obj);
}
} else if (obj instanceof TokenString) {
let type = "", baseType = "";
let comps: null | Array<ParamType> = null;
if (consumeKeywords(obj, setify([ "tuple" ])).has("tuple") || obj.peekType("OPEN_PAREN")) {
// Tuple
baseType = "tuple";
comps = obj.popParams().map((t) => ParamType.from(t));
type = `tuple(${ comps.map((c) => c.format()).join(",") })`;
} else {
// Normal
type = verifyBasicType(obj.popType("TYPE"));
baseType = type;
}
// Check for Array
let arrayChildren: null | ParamType = null;
let arrayLength: null | number = null;
while (obj.length && obj.peekType("BRACKET")) {
const bracket = obj.pop(); //arrays[i];
arrayChildren = new ParamType(_guard, "", type, baseType, null, comps, arrayLength, arrayChildren);
arrayLength = bracket.value;
type += bracket.text;
baseType = "array";
comps = null;
}
let indexed: null | boolean = null;
const keywords = consumeKeywords(obj, KwModifiers);
if (keywords.has("indexed")) {
if (!allowIndexed) { throw new Error(""); }
indexed = true;
}
const name = (obj.peekType("ID") ? obj.pop().text: "");
if (obj.length) { throw new Error("leftover tokens"); }
return new ParamType(_guard, name, type, baseType, indexed, comps, arrayLength, arrayChildren);
}
const name = obj.name;
assertArgument(!name || (typeof(name) === "string" && name.match(regexId)),
"invalid name", "obj.name", name);
let indexed = obj.indexed;
if (indexed != null) {
assertArgument(allowIndexed, "parameter cannot be indexed", "obj.indexed", obj.indexed);
indexed = !!indexed;
}
let type = obj.type;
let arrayMatch = type.match(regexArrayType);
if (arrayMatch) {
const arrayLength = parseInt(arrayMatch[2] || "-1");
const arrayChildren = ParamType.from({
type: arrayMatch[1],
components: obj.components
});
return new ParamType(_guard, name || "", type, "array", indexed, null, arrayLength, arrayChildren);
}
if (type === "tuple" || type.startsWith("tuple("/* fix: ) */) || type.startsWith("(" /* fix: ) */)) {
const comps = (obj.components != null) ? obj.components.map((c: any) => ParamType.from(c)): null;
const tuple = new ParamType(_guard, name || "", type, "tuple", indexed, comps, null, null);
// @TODO: use lexer to validate and normalize type
return tuple;
}
type = verifyBasicType(obj.type);
return new ParamType(_guard, name || "", type, type, indexed, null, null, null);
}
/**
* Returns true if %%value%% is a **ParamType**.
*/
static isParamType(value: any): value is ParamType {
return (value && value[internal] === ParamTypeInternal);
}
}
/**
* The type of a [[Fragment]].
*/
export type FragmentType = "constructor" | "error" | "event" | "fallback" | "function" | "struct";
/**
* An abstract class to represent An individual fragment from a parse ABI.
*/
export abstract class Fragment {
/**
* The type of the fragment.
*/
readonly type!: FragmentType;
/**
* The inputs for the fragment.
*/
readonly inputs!: ReadonlyArray<ParamType>;
/**
* @private
*/
constructor(guard: any, type: FragmentType, inputs: ReadonlyArray<ParamType>) {
assertPrivate(guard, _guard, "Fragment");
inputs = Object.freeze(inputs.slice());
defineProperties<Fragment>(this, { type, inputs });
}
/**
* Returns a string representation of this fragment as %%format%%.
*/
abstract format(format?: FormatType): string;
/**
* Creates a new **Fragment** for %%obj%%, wich can be any supported
* ABI frgament type.
*/
static from(obj: any): Fragment {
if (typeof(obj) === "string") {
// Try parsing JSON...
try {
Fragment.from(JSON.parse(obj));
} catch (e) { }
// ...otherwise, use the human-readable lexer
return Fragment.from(lex(obj));
}
if (obj instanceof TokenString) {
// Human-readable ABI (already lexed)
const type = obj.peekKeyword(KwTypes);
switch (type) {
case "constructor": return ConstructorFragment.from(obj);
case "error": return ErrorFragment.from(obj);
case "event": return EventFragment.from(obj);
case "fallback": case "receive":
return FallbackFragment.from(obj);
case "function": return FunctionFragment.from(obj);
case "struct": return StructFragment.from(obj);
}
} else if (typeof(obj) === "object") {
// JSON ABI
switch (obj.type) {
case "constructor": return ConstructorFragment.from(obj);
case "error": return ErrorFragment.from(obj);
case "event": return EventFragment.from(obj);
case "fallback": case "receive":
return FallbackFragment.from(obj);
case "function": return FunctionFragment.from(obj);
case "struct": return StructFragment.from(obj);
}
assert(false, `unsupported type: ${ obj.type }`, "UNSUPPORTED_OPERATION", {
operation: "Fragment.from"
});
}
assertArgument(false, "unsupported frgament object", "obj", obj);
}
/**
* Returns true if %%value%% is a [[ConstructorFragment]].
*/
static isConstructor(value: any): value is ConstructorFragment {
return ConstructorFragment.isFragment(value);
}
/**
* Returns true if %%value%% is an [[ErrorFragment]].
*/
static isError(value: any): value is ErrorFragment {
return ErrorFragment.isFragment(value);
}
/**
* Returns true if %%value%% is an [[EventFragment]].
*/
static isEvent(value: any): value is EventFragment {
return EventFragment.isFragment(value);
}
/**
* Returns true if %%value%% is a [[FunctionFragment]].
*/
static isFunction(value: any): value is FunctionFragment {
return FunctionFragment.isFragment(value);
}
/**
* Returns true if %%value%% is a [[StructFragment]].
*/
static isStruct(value: any): value is StructFragment {
return StructFragment.isFragment(value);
}
}
/**
* An abstract class to represent An individual fragment
* which has a name from a parse ABI.
*/
export abstract class NamedFragment extends Fragment {
/**
* The name of the fragment.
*/
readonly name!: string;
/**
* @private
*/
constructor(guard: any, type: FragmentType, name: string, inputs: ReadonlyArray<ParamType>) {
super(guard, type, inputs);
assertArgument(typeof(name) === "string" && name.match(regexId),
"invalid identifier", "name", name);
inputs = Object.freeze(inputs.slice());
defineProperties<NamedFragment>(this, { name });
}
}
function joinParams(format: FormatType, params: ReadonlyArray<ParamType>): string {
return "(" + params.map((p) => p.format(format)).join((format === "full") ? ", ": ",") + ")";
}
/**
* A Fragment which represents a //Custom Error//.
*/
export class ErrorFragment extends NamedFragment {
/**
* @private
*/
constructor(guard: any, name: string, inputs: ReadonlyArray<ParamType>) {
super(guard, "error", name, inputs);
Object.defineProperty(this, internal, { value: ErrorFragmentInternal });
}
/**
* The Custom Error selector.
*/
get selector(): string {
return id(this.format("sighash")).substring(0, 10);
}
/**
* Returns a string representation of this fragment as %%format%%.
*/
format(format?: FormatType): string {
if (format == null) { format = "sighash"; }
if (format === "json") {
return JSON.stringify({
type: "error",
name: this.name,
inputs: this.inputs.map((input) => JSON.parse(input.format(format))),
});
}
const result: Array<string> = [ ];
if (format !== "sighash") { result.push("error"); }
result.push(this.name + joinParams(format, this.inputs));
return result.join(" ");
}
/**
* Returns a new **ErrorFragment** for %%obj%%.
*/
static from(obj: any): ErrorFragment {
if (ErrorFragment.isFragment(obj)) { return obj; }
if (typeof(obj) === "string") {
return ErrorFragment.from(lex(obj));
} else if (obj instanceof TokenString) {
const name = consumeName("error", obj);
const inputs = consumeParams(obj);
consumeEoi(obj);
return new ErrorFragment(_guard, name, inputs);
}
return new ErrorFragment(_guard, obj.name,
obj.inputs ? obj.inputs.map(ParamType.from): [ ]);
}
/**
* Returns ``true`` and provides a type guard if %%value%% is an
* **ErrorFragment**.
*/
static isFragment(value: any): value is ErrorFragment {
return (value && value[internal] === ErrorFragmentInternal);
}
}
/**
* A Fragment which represents an Event.
*/
export class EventFragment extends NamedFragment {
/**
* Whether this event is anonymous.
*/
readonly anonymous!: boolean;
/**
* @private
*/
constructor(guard: any, name: string, inputs: ReadonlyArray<ParamType>, anonymous: boolean) {
super(guard, "event", name, inputs);
Object.defineProperty(this, internal, { value: EventFragmentInternal });
defineProperties<EventFragment>(this, { anonymous });
}
/**
* The Event topic hash.
*/
get topicHash(): string {
return id(this.format("sighash"));
}
/**
* Returns a string representation of this event as %%format%%.
*/
format(format?: FormatType): string {
if (format == null) { format = "sighash"; }
if (format === "json") {
return JSON.stringify({
type: "event",
anonymous: this.anonymous,
name: this.name,
inputs: this.inputs.map((i) => JSON.parse(i.format(format)))
});
}
const result: Array<string> = [ ];
if (format !== "sighash") { result.push("event"); }
result.push(this.name + joinParams(format, this.inputs));
if (format !== "sighash" && this.anonymous) { result.push("anonymous"); }
return result.join(" ");
}
/**
* Return the topic hash for an event with %%name%% and %%params%%.
*/
static getTopicHash(name: string, params?: Array<any>): string {
params = (params || []).map((p) => ParamType.from(p));
const fragment = new EventFragment(_guard, name, params, false);
return fragment.topicHash;
}
/**
* Returns a new **EventFragment** for %%obj%%.
*/
static from(obj: any): EventFragment {
if (EventFragment.isFragment(obj)) { return obj; }
if (typeof(obj) === "string") {
try {
return EventFragment.from(lex(obj));
} catch (error) {
assertArgument(false, "invalid event fragment", "obj", obj);
}
} else if (obj instanceof TokenString) {
const name = consumeName("event", obj);
const inputs = consumeParams(obj, true);
const anonymous = !!consumeKeywords(obj, setify([ "anonymous" ])).has("anonymous");
consumeEoi(obj);
return new EventFragment(_guard, name, inputs, anonymous);
}
return new EventFragment(_guard, obj.name,
obj.inputs ? obj.inputs.map((p: any) => ParamType.from(p, true)): [ ], !!obj.anonymous);
}
/**
* Returns ``true`` and provides a type guard if %%value%% is an
* **EventFragment**.
*/
static isFragment(value: any): value is EventFragment {
return (value && value[internal] === EventFragmentInternal);
}
}
/**
* A Fragment which represents a constructor.
*/
export class ConstructorFragment extends Fragment {
/**
* Whether the constructor can receive an endowment.
*/
readonly payable!: boolean;
/**
* The recommended gas limit for deployment or ``null``.
*/
readonly gas!: null | bigint;
/**
* @private
*/
constructor(guard: any, type: FragmentType, inputs: ReadonlyArray<ParamType>, payable: boolean, gas: null | bigint) {
super(guard, type, inputs);
Object.defineProperty(this, internal, { value: ConstructorFragmentInternal });
defineProperties<ConstructorFragment>(this, { payable, gas });
}
/**
* Returns a string representation of this constructor as %%format%%.
*/
format(format?: FormatType): string {
assert(format != null && format !== "sighash", "cannot format a constructor for sighash",
"UNSUPPORTED_OPERATION", { operation: "format(sighash)" });
if (format === "json") {
return JSON.stringify({
type: "constructor",
stateMutability: (this.payable ? "payable": "undefined"),
payable: this.payable,
gas: ((this.gas != null) ? this.gas: undefined),
inputs: this.inputs.map((i) => JSON.parse(i.format(format)))
});
}
const result = [ `constructor${ joinParams(format, this.inputs) }` ];
if (this.payable) { result.push("payable"); }
if (this.gas != null) { result.push(`@${ this.gas.toString() }`); }
return result.join(" ");
}
/**
* Returns a new **ConstructorFragment** for %%obj%%.
*/
static from(obj: any): ConstructorFragment {
if (ConstructorFragment.isFragment(obj)) { return obj; }
if (typeof(obj) === "string") {
try {
return ConstructorFragment.from(lex(obj));
} catch (error) {
assertArgument(false, "invalid constuctor fragment", "obj", obj);
}
} else if (obj instanceof TokenString) {
consumeKeywords(obj, setify([ "constructor" ]));
const inputs = consumeParams(obj);
const payable = !!consumeKeywords(obj, KwVisibDeploy).has("payable");
const gas = consumeGas(obj);
consumeEoi(obj);
return new ConstructorFragment(_guard, "constructor", inputs, payable, gas);
}
return new ConstructorFragment(_guard, "constructor",
obj.inputs ? obj.inputs.map(ParamType.from): [ ],
!!obj.payable, (obj.gas != null) ? obj.gas: null);
}
/**
* Returns ``true`` and provides a type guard if %%value%% is a
* **ConstructorFragment**.
*/
static isFragment(value: any): value is ConstructorFragment {
return (value && value[internal] === ConstructorFragmentInternal);
}
}
/**
* A Fragment which represents a method.
*/
export class FallbackFragment extends Fragment {
/**
* If the function can be sent value during invocation.
*/
readonly payable!: boolean;
constructor(guard: any, inputs: ReadonlyArray<ParamType>, payable: boolean) {
super(guard, "fallback", inputs);
Object.defineProperty(this, internal, { value: FallbackFragmentInternal });
defineProperties<FallbackFragment>(this, { payable });
}
/**
* Returns a string representation of this fallback as %%format%%.
*/
format(format?: FormatType): string {
const type = ((this.inputs.length === 0) ? "receive": "fallback");
if (format === "json") {
const stateMutability = (this.payable ? "payable": "nonpayable");
return JSON.stringify({ type, stateMutability });
}
return `${ type }()${ this.payable ? " payable": "" }`;
}
/**
* Returns a new **FallbackFragment** for %%obj%%.
*/
static from(obj: any): FallbackFragment {
if (FallbackFragment.isFragment(obj)) { return obj; }
if (typeof(obj) === "string") {
try {
return FallbackFragment.from(lex(obj));
} catch (error) {
assertArgument(false, "invalid fallback fragment", "obj", obj);
}
} else if (obj instanceof TokenString) {
const errorObj = obj.toString();
const topIsValid = obj.peekKeyword(setify([ "fallback", "receive" ]));
assertArgument(topIsValid, "type must be fallback or receive", "obj", errorObj);
const type = obj.popKeyword(setify([ "fallback", "receive" ]));
// receive()
if (type === "receive") {
const inputs = consumeParams(obj);
assertArgument(inputs.length === 0, `receive cannot have arguments`, "obj.inputs", inputs);
consumeKeywords(obj, setify([ "payable" ]));
consumeEoi(obj);
return new FallbackFragment(_guard, [ ], true);
}
// fallback() [payable]
// fallback(bytes) [payable] returns (bytes)
let inputs = consumeParams(obj);
if (inputs.length) {
assertArgument(inputs.length === 1 && inputs[0].type === "bytes",
"invalid fallback inputs", "obj.inputs",
inputs.map((i) => i.format("minimal")).join(", "));
} else {
inputs = [ ParamType.from("bytes") ];
}
const mutability = consumeMutability(obj);
assertArgument(mutability === "nonpayable" || mutability === "payable", "fallback cannot be constants", "obj.stateMutability", mutability);
if (consumeKeywords(obj, setify([ "returns" ])).has("returns")) {
const outputs = consumeParams(obj);
assertArgument(outputs.length === 1 && outputs[0].type === "bytes",
"invalid fallback outputs", "obj.outputs",
outputs.map((i) => i.format("minimal")).join(", "));
}
consumeEoi(obj);
return new FallbackFragment(_guard, inputs, mutability === "payable");
}
if (obj.type === "receive") {
return new FallbackFragment(_guard, [ ], true);
}
if (obj.type === "fallback") {
const inputs = [ ParamType.from("bytes") ];
const payable = (obj.stateMutability === "payable");
return new FallbackFragment(_guard, inputs, payable);
}
assertArgument(false, "invalid fallback description", "obj", obj);
}
/**
* Returns ``true`` and provides a type guard if %%value%% is a
* **FallbackFragment**.
*/
static isFragment(value: any): value is FallbackFragment {
return (value && value[internal] === FallbackFragmentInternal);
}
}
/**
* A Fragment which represents a method.
*/
export class FunctionFragment extends NamedFragment {
/**
* If the function is constant (e.g. ``pure`` or ``view`` functions).
*/
readonly constant!: boolean;
/**
* The returned types for the result of calling this function.
*/
readonly outputs!: ReadonlyArray<ParamType>;
/**
* The state mutability (e.g. ``payable``, ``nonpayable``, ``view``
* or ``pure``)
*/
readonly stateMutability!: "payable" | "nonpayable" | "view" | "pure";
/**
* If the function can be sent value during invocation.
*/
readonly payable!: boolean;
/**
* The recommended gas limit to send when calling this function.
*/
readonly gas!: null | bigint;
/**
* @private
*/
constructor(guard: any, name: string, stateMutability: "payable" | "nonpayable" | "view" | "pure", inputs: ReadonlyArray<ParamType>, outputs: ReadonlyArray<ParamType>, gas: null | bigint) {
super(guard, "function", name, inputs);
Object.defineProperty(this, internal, { value: FunctionFragmentInternal });
outputs = Object.freeze(outputs.slice());
const constant = (stateMutability === "view" || stateMutability === "pure");
const payable = (stateMutability === "payable");
defineProperties<FunctionFragment>(this, { constant, gas, outputs, payable, stateMutability });
}
/**
* The Function selector.
*/
get selector(): string {
return id(this.format("sighash")).substring(0, 10);
}
/**
* Returns a string representation of this function as %%format%%.
*/
format(format?: FormatType): string {
if (format == null) { format = "sighash"; }
if (format === "json") {
return JSON.stringify({
type: "function",
name: this.name,
constant: this.constant,
stateMutability: ((this.stateMutability !== "nonpayable") ? this.stateMutability: undefined),
payable: this.payable,
gas: ((this.gas != null) ? this.gas: undefined),
inputs: this.inputs.map((i) => JSON.parse(i.format(format))),
outputs: this.outputs.map((o) => JSON.parse(o.format(format))),
});
}
const result: Array<string> = [];
if (format !== "sighash") { result.push("function"); }
result.push(this.name + joinParams(format, this.inputs));
if (format !== "sighash") {
if (this.stateMutability !== "nonpayable") {
result.push(this.stateMutability);
}
if (this.outputs && this.outputs.length) {
result.push("returns");
result.push(joinParams(format, this.outputs));
}
if (this.gas != null) { result.push(`@${ this.gas.toString() }`); }
}
return result.join(" ");
}
/**
* Return the selector for a function with %%name%% and %%params%%.
*/
static getSelector(name: string, params?: Array<any>): string {
params = (params || []).map((p) => ParamType.from(p));
const fragment = new FunctionFragment(_guard, name, "view", params, [ ], null);
return fragment.selector;
}
/**
* Returns a new **FunctionFragment** for %%obj%%.
*/
static from(obj: any): FunctionFragment {
if (FunctionFragment.isFragment(obj)) { return obj; }
if (typeof(obj) === "string") {
try {
return FunctionFragment.from(lex(obj));
} catch (error) {
assertArgument(false, "invalid function fragment", "obj", obj);
}
} else if (obj instanceof TokenString) {
const name = consumeName("function", obj);
const inputs = consumeParams(obj);
const mutability = consumeMutability(obj);
let outputs: Array<ParamType> = [ ];
if (consumeKeywords(obj, setify([ "returns" ])).has("returns")) {
outputs = consumeParams(obj);
}
const gas = consumeGas(obj);
consumeEoi(obj);
return new FunctionFragment(_guard, name, mutability, inputs, outputs, gas);
}
let stateMutability = obj.stateMutability;
// Use legacy Solidity ABI logic if stateMutability is missing
if (stateMutability == null) {
stateMutability = "payable";
if (typeof(obj.constant) === "boolean") {
stateMutability = "view";
if (!obj.constant) {
stateMutability = "payable"
if (typeof(obj.payable) === "boolean" && !obj.payable) {
stateMutability = "nonpayable";
}
}
} else if (typeof(obj.payable) === "boolean" && !obj.payable) {
stateMutability = "nonpayable";
}
}
// @TODO: verifyState for stateMutability (e.g. throw if
// payable: false but stateMutability is "nonpayable")
return new FunctionFragment(_guard, obj.name, stateMutability,
obj.inputs ? obj.inputs.map(ParamType.from): [ ],
obj.outputs ? obj.outputs.map(ParamType.from): [ ],
(obj.gas != null) ? obj.gas: null);
}
/**
* Returns ``true`` and provides a type guard if %%value%% is a
* **FunctionFragment**.
*/
static isFragment(value: any): value is FunctionFragment {
return (value && value[internal] === FunctionFragmentInternal);
}
}
/**
* A Fragment which represents a structure.
*/
export class StructFragment extends NamedFragment {
/**
* @private
*/
constructor(guard: any, name: string, inputs: ReadonlyArray<ParamType>) {
super(guard, "struct", name, inputs);
Object.defineProperty(this, internal, { value: StructFragmentInternal });
}
/**
* Returns a string representation of this struct as %%format%%.
*/
format(): string {
throw new Error("@TODO");
}
/**
* Returns a new **StructFragment** for %%obj%%.
*/
static from(obj: any): StructFragment {
if (typeof(obj) === "string") {
try {
return StructFragment.from(lex(obj));
} catch (error) {
assertArgument(false, "invalid struct fragment", "obj", obj);
}
} else if (obj instanceof TokenString) {
const name = consumeName("struct", obj);
const inputs = consumeParams(obj);
consumeEoi(obj);
return new StructFragment(_guard, name, inputs);
}
return new StructFragment(_guard, obj.name, obj.inputs ? obj.inputs.map(ParamType.from): [ ]);
}
// @TODO: fix this return type
/**
* Returns ``true`` and provides a type guard if %%value%% is a
* **StructFragment**.
*/
static isFragment(value: any): value is FunctionFragment {
return (value && value[internal] === StructFragmentInternal);
}
}
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