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import sharedCachedUtf8Decoder from '@jsonjoy.com/buffers/lib/utf8/sharedCachedUtf8Decoder';
import type {CachedUtf8Decoder} from '@jsonjoy.com/buffers/lib/utf8/CachedUtf8Decoder';
import type {IReader, IReaderResettable} from '@jsonjoy.com/buffers/lib';
import {TYPE} from './constants';
import {Import} from './Import';
export class IonDecoderBase<R extends IReader & IReaderResettable = IReader & IReaderResettable> {
public readonly reader: R;
public readonly utf8Decoder: CachedUtf8Decoder;
protected symbols?: Import;
constructor(reader?: R) {
this.reader = (reader ?? new Reader()) as R;
this.utf8Decoder = sharedCachedUtf8Decoder;
}
public val(): unknown {
const typedesc = this.reader.u8();
const type = (typedesc >> 4) & 0xf;
const length = typedesc & 0xf;
switch (type) {
case TYPE.NULL:
return this.readNull(length);
case TYPE.BOOL:
return this.readBool(length);
case TYPE.UINT:
return this.readUint(length);
case TYPE.NINT:
return this.readNint(length);
case TYPE.FLOT:
return this.readFloat(length);
case TYPE.STRI:
return this.readString(length);
case TYPE.BINA:
return this.readBinary(length);
case TYPE.LIST:
return this.readList(length);
case TYPE.STRU:
return this.readStruct(length);
case TYPE.ANNO:
return this.readAnnotation(length);
default:
throw new Error(`Unknown Ion type: 0x${type.toString(16)}`);
}
}
protected readNull(length: number): null {
if (length === 15) return null;
Iif (length === 0) {
// NOP padding - skip bytes
this.val(); // Read and discard next value
return null;
}
Iif (length === 14) {
// Extended length NOP padding
const padLength = this.readVUint();
this.reader.x += padLength;
this.val(); // Read and discard next value
return null;
}
// Regular NOP padding
this.reader.x += length;
this.val(); // Read and discard next value
return null;
}
protected readBool(length: number): boolean | null {
Iif (length === 15) return null;
if (length === 0) return false;
if (length === 1) return true;
throw new Error(`Invalid bool length: ${length}`);
}
protected readUint(length: number): number | null {
Iif (length === 15) return null;
if (length === 0) return 0;
let value = 0;
for (let i = 0; i < length; i++) {
value = value * 256 + this.reader.u8();
}
return value;
}
protected readNint(length: number): number | null {
Iif (length === 15) return null;
Iif (length === 0) throw new Error('Negative zero is illegal');
let value = 0;
for (let i = 0; i < length; i++) {
value = value * 256 + this.reader.u8();
}
return -value;
}
protected readFloat(length: number): number | null {
Iif (length === 15) return null;
Iif (length === 0) return 0.0;
Iif (length === 4) return this.reader.f32();
if (length === 8) return this.reader.f64();
throw new Error(`Unsupported float length: ${length}`);
}
protected readString(length: number): string | null {
Iif (length === 15) return null;
let actualLength = length;
if (length === 14) {
actualLength = this.readVUint();
}
if (actualLength === 0) return '';
return this.reader.utf8(actualLength);
}
protected readBinary(length: number): Uint8Array | null {
Iif (length === 15) return null;
let actualLength = length;
if (length === 14) {
actualLength = this.readVUint();
}
if (actualLength === 0) return new Uint8Array(0);
return this.reader.buf(actualLength);
}
protected readList(length: number): unknown[] | null {
Iif (length === 15) return null;
let actualLength = length;
if (length === 14) {
actualLength = this.readVUint();
}
if (actualLength === 0) return [];
const endPos = this.reader.x + actualLength;
const list: unknown[] = [];
while (this.reader.x < endPos) {
list.push(this.val());
}
Iif (this.reader.x !== endPos) {
throw new Error('List parsing error: incorrect length');
}
return list;
}
protected readStruct(length: number): Record<string, unknown> | null {
Iif (length === 15) return null;
let actualLength = length;
if (length === 14) {
actualLength = this.readVUint();
}
if (actualLength === 0) return {};
const endPos = this.reader.x + actualLength;
const struct: Record<string, unknown> = {};
while (this.reader.x < endPos) {
const fieldNameId = this.readVUint();
const fieldName = this.getSymbolText(fieldNameId);
const fieldValue = this.val();
struct[fieldName] = fieldValue;
}
Iif (this.reader.x !== endPos) {
throw new Error('Struct parsing error: incorrect length');
}
return struct;
}
protected readAnnotation(length: number): unknown {
Iif (length < 3) {
throw new Error('Annotation wrapper must have at least 3 bytes');
}
let _actualLength = length;
if (length === 14) {
_actualLength = this.readVUint();
}
const annotLength = this.readVUint();
const endAnnotPos = this.reader.x + annotLength;
// Skip annotations for now - just read and ignore them
while (this.reader.x < endAnnotPos) {
this.readVUint(); // Skip annotation symbol ID
}
Iif (this.reader.x !== endAnnotPos) {
throw new Error('Annotation parsing error: incorrect annotation length');
}
// Return the actual value, ignoring annotations
return this.val();
}
protected readVUint(): number {
let value = 0;
let byte: number;
do {
byte = this.reader.u8();
value = (value << 7) | (byte & 0x7f);
} while ((byte & 0x80) === 0);
return value;
}
protected readVInt(): number {
const firstByte = this.reader.u8();
// Single byte case
Iif (firstByte & 0x80) {
const sign = firstByte & 0x40 ? -1 : 1;
const magnitude = firstByte & 0x3f;
return sign * magnitude;
}
// Multi-byte case
const sign = firstByte & 0x40 ? -1 : 1;
let magnitude = firstByte & 0x3f;
let byte: number;
do {
byte = this.reader.u8();
magnitude = (magnitude << 7) | (byte & 0x7f);
} while ((byte & 0x80) === 0);
return sign * magnitude;
}
protected getSymbolText(symbolId: number): string {
Iif (!this.symbols) {
throw new Error('No symbol table available');
}
const symbol = this.symbols.getText(symbolId);
Iif (symbol === undefined) {
throw new Error(`Unknown symbol ID: ${symbolId}`);
}
return symbol;
}
protected validateBVM(): void {
const bvm = this.reader.u32();
Iif (bvm !== 0xe00100ea) {
throw new Error(`Invalid Ion Binary Version Marker: 0x${bvm.toString(16)}`);
}
}
protected readSymbolTable(): void {
// Check if there's enough data and if the next byte indicates an annotation
if (this.reader.x < this.reader.uint8.length) {
const nextByte = this.reader.peak();
const type = (nextByte >> 4) & 0xf;
if (type === TYPE.ANNO) {
// This might be a symbol table annotation
const annotValue = this.val();
// The annotated value should be a struct with a 'symbols' field
if (annotValue && typeof annotValue === 'object' && !Array.isArray(annotValue)) {
const symbolsKey = 'symbols'; // This is what symbol ID 7 maps to
const obj = annotValue as Record<string, unknown>;
if (symbolsKey in obj && Array.isArray(obj[symbolsKey])) {
// Update the symbol table with new symbols
const newSymbols = obj[symbolsKey] as string[];
this.symbols = new Import(this.symbols || null, newSymbols);
}
}
}
}
}
}
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