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array.ts
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array.ts
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"use strict";
import { Logger } from "@ethersproject/logger";
import { version } from "../_version";
const logger = new Logger(version);
import { Coder, Reader, Result, Writer } from "./abstract-coder";
import { AnonymousCoder } from "./anonymous";
export function pack(writer: Writer, coders: ReadonlyArray<Coder>, values: Array<any> | { [ name: string ]: any }): number {
let arrayValues: Array<any> = null;
if (Array.isArray(values)) {
arrayValues = values;
} else if (values && typeof(values) === "object") {
let unique: { [ name: string ]: boolean } = { };
arrayValues = coders.map((coder) => {
const name = coder.localName;
if (!name) {
logger.throwError("cannot encode object for signature with missing names", Logger.errors.INVALID_ARGUMENT, {
argument: "values",
coder: coder,
value: values
});
}
if (unique[name]) {
logger.throwError("cannot encode object for signature with duplicate names", Logger.errors.INVALID_ARGUMENT, {
argument: "values",
coder: coder,
value: values
});
}
unique[name] = true;
return values[name];
});
} else {
logger.throwArgumentError("invalid tuple value", "tuple", values);
}
if (coders.length !== arrayValues.length) {
logger.throwArgumentError("types/value length mismatch", "tuple", values);
}
let staticWriter = new Writer(writer.wordSize);
let dynamicWriter = new Writer(writer.wordSize);
let updateFuncs: Array<(baseOffset: number) => void> = [];
coders.forEach((coder, index) => {
let value = arrayValues[index];
if (coder.dynamic) {
// Get current dynamic offset (for the future pointer)
let dynamicOffset = dynamicWriter.length;
// Encode the dynamic value into the dynamicWriter
coder.encode(dynamicWriter, value);
// Prepare to populate the correct offset once we are done
let updateFunc = staticWriter.writeUpdatableValue();
updateFuncs.push((baseOffset: number) => {
updateFunc(baseOffset + dynamicOffset);
});
} else {
coder.encode(staticWriter, value);
}
});
// Backfill all the dynamic offsets, now that we know the static length
updateFuncs.forEach((func) => { func(staticWriter.length); });
let length = writer.writeBytes(staticWriter.data);
length += writer.writeBytes(dynamicWriter.data);
return length;
}
export function unpack(reader: Reader, coders: Array<Coder>): Result {
let values: any = [];
// A reader anchored to this base
let baseReader = reader.subReader(0);
// The amount of dynamic data read; to consume later to synchronize
let dynamicLength = 0;
coders.forEach((coder) => {
let value: any = null;
if (coder.dynamic) {
let offset = reader.readValue();
let offsetReader = baseReader.subReader(offset.toNumber());
try {
value = coder.decode(offsetReader);
} catch (error) {
// Cannot recover from this
if (error.code === Logger.errors.BUFFER_OVERRUN) { throw error; }
value = error;
value.baseType = coder.name;
value.name = coder.localName;
value.type = coder.type;
}
dynamicLength += offsetReader.consumed;
} else {
try {
value = coder.decode(reader);
} catch (error) {
// Cannot recover from this
if (error.code === Logger.errors.BUFFER_OVERRUN) { throw error; }
value = error;
value.baseType = coder.name;
value.name = coder.localName;
value.type = coder.type;
}
}
if (value != undefined) {
values.push(value);
}
});
// @TODO: get rid of this an see if it still works?
// Consume the dynamic components in the main reader
reader.readBytes(dynamicLength);
// We only output named properties for uniquely named coders
const uniqueNames = coders.reduce((accum, coder) => {
const name = coder.localName;
if (name) {
if (!accum[name]) { accum[name] = 0; }
accum[name]++;
}
return accum;
}, <{ [ name: string ]: number }>{ });
// Add any named parameters (i.e. tuples)
coders.forEach((coder: Coder, index: number) => {
let name = coder.localName;
if (!name || uniqueNames[name] !== 1) { return; }
if (name === "length") { name = "_length"; }
if (values[name] != null) { return; }
const value = values[index];
if (value instanceof Error) {
Object.defineProperty(values, name, {
get: () => { throw value; }
});
} else {
values[name] = value;
}
});
for (let i = 0; i < values.length; i++) {
const value = values[i];
if (value instanceof Error) {
Object.defineProperty(values, i, {
get: () => { throw value; }
});
}
}
return Object.freeze(values);
}
export class ArrayCoder extends Coder {
readonly coder: Coder;
readonly length: number;
constructor(coder: Coder, length: number, localName: string) {
const type = (coder.type + "[" + (length >= 0 ? length: "") + "]");
const dynamic = (length === -1 || coder.dynamic);
super("array", type, localName, dynamic);
this.coder = coder;
this.length = length;
}
encode(writer: Writer, value: Array<any>): number {
if (!Array.isArray(value)) {
this._throwError("expected array value", value);
}
let count = this.length;
if (count === -1) {
count = value.length;
writer.writeValue(value.length);
}
logger.checkArgumentCount(value.length, count, "coder array" + (this.localName? (" "+ this.localName): ""));
let coders = [];
for (let i = 0; i < value.length; i++) { coders.push(this.coder); }
return pack(writer, coders, value);
}
decode(reader: Reader): any {
let count = this.length;
if (count === -1) {
count = reader.readValue().toNumber();
}
let coders = [];
for (let i = 0; i < count; i++) { coders.push(new AnonymousCoder(this.coder)); }
return reader.coerce(this.name, unpack(reader, coders));
}
}