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type AbstractPredicateOp,
type Op,
OpAdd,
OpAnd,
OpContains,
OpCopy,
OpDefined,
OpEnds,
OpExtend,
OpFlip,
OpIn,
OpInc,
OpLess,
OpMatches,
OpMerge,
OpMore,
OpMove,
OpNot,
OpOr,
OpRemove,
OpReplace,
OpSplit,
OpStarts,
OpStrDel,
OpStrIns,
OpTest,
OpTestString,
OpTestStringLen,
OpTestType,
OpType,
OpUndefined,
} from '../../op';
import {MsgPackDecoderFast} from '@jsonjoy.com/json-pack/lib/msgpack/MsgPackDecoderFast';
import {OPCODE} from '../../constants';
import type {Path} from '@jsonjoy.com/json-pointer';
import type {JsonPatchTypes} from '../json/types';
import {createMatcherDefault} from '../../util';
import type {JsonPatchOptions} from '../../types';
import type {Reader} from '@jsonjoy.com/util/lib/buffers/Reader';
export class Decoder extends MsgPackDecoderFast<Reader> {
constructor(private readonly options: JsonPatchOptions) {
super();
}
public decode(uint8: Uint8Array): Op[] {
this.reader.reset(uint8);
return this.decodePatch();
}
protected decodePatch(): Op[] {
const len = this.decodeArrayHeader();
const ops: Op[] = [];
for (let i = 0; i < len; i++) ops.push(this.decodeOp(undefined));
return ops;
}
protected decodeOp(parent: Op | undefined): Op {
const length = this.decodeArrayHeader();
const opcode = this.reader.u8();
switch (opcode) {
case OPCODE.add: {
const path = this.decodeArray() as Path;
const value = this.val();
return new OpAdd(path, value);
}
case OPCODE.and: {
const path = this.decodePath(parent);
const length = this.decodeArrayHeader();
const ops: AbstractPredicateOp[] = [];
const op = new OpAnd(path, ops);
for (let i = 0; i < length; i++) ops.push(this.decodeOp(op) as AbstractPredicateOp);
return op;
}
case OPCODE.contains: {
const path = this.decodePath(parent);
const value = this.decodeString();
const ignoreCase = length > 3;
return new OpContains(path, value, ignoreCase);
}
case OPCODE.copy: {
const path = this.decodeArray() as Path;
const from = this.decodeArray() as Path;
return new OpCopy(path, from);
}
case OPCODE.defined: {
const path = this.decodePath(parent);
return new OpDefined(path);
}
case OPCODE.ends: {
const path = this.decodePath(parent);
const value = this.decodeString();
const ignoreCase = length > 3;
return new OpEnds(path, value, ignoreCase);
}
case OPCODE.extend: {
const path = this.decodeArray() as Path;
const props = this.decodeObject() as Record<string, unknown>;
const deleteNull = length > 3;
return new OpExtend(path, props, deleteNull);
}
case OPCODE.flip: {
const path = this.decodeArray() as Path;
return new OpFlip(path);
}
case OPCODE.in: {
const path = this.decodePath(parent);
const value = this.decodeArray();
return new OpIn(path, value);
}
case OPCODE.inc: {
const path = this.decodePath(parent);
const inc = this.val() as number;
return new OpInc(path, inc);
}
case OPCODE.less: {
const path = this.decodePath(parent);
const value = this.val() as number;
return new OpLess(path, value);
}
case OPCODE.matches: {
const path = this.decodePath(parent);
const value = this.decodeString();
const ignoreCase = length > 3;
return new OpMatches(path, value, ignoreCase, this.options.createMatcher || createMatcherDefault);
}
case OPCODE.merge: {
const hasProps = length > 3;
const path = this.decodeArray() as Path;
const pos = this.val() as number;
const props = hasProps ? this.decodeObject() : null;
return new OpMerge(path, pos, props);
}
case OPCODE.more: {
const path = this.decodePath(parent);
const value = this.val() as number;
return new OpMore(path, value);
}
case OPCODE.move: {
const path = this.decodeArray() as Path;
const from = this.decodeArray() as Path;
return new OpMove(path, from);
}
case OPCODE.not: {
const path = this.decodePath(parent);
const length = this.decodeArrayHeader();
const ops: AbstractPredicateOp[] = [];
const op = new OpNot(path, ops);
for (let i = 0; i < length; i++) ops.push(this.decodeOp(op) as AbstractPredicateOp);
return op;
}
case OPCODE.or: {
const path = this.decodePath(parent);
const length = this.decodeArrayHeader();
const ops: AbstractPredicateOp[] = [];
const op = new OpOr(path, ops);
for (let i = 0; i < length; i++) ops.push(this.decodeOp(op) as AbstractPredicateOp);
return op;
}
case OPCODE.remove: {
const path = this.decodeArray() as Path;
const hasOldValue = length > 2;
const oldValue = hasOldValue ? this.val() : undefined;
return new OpRemove(path, oldValue);
}
case OPCODE.replace: {
const path = this.decodeArray() as Path;
const value = this.val();
const hasOldValue = length > 3;
const oldValue = hasOldValue ? this.val() : undefined;
return new OpReplace(path, value, oldValue);
}
case OPCODE.split: {
const path = this.decodeArray() as Path;
const pos = this.val() as number;
const hasProps = length > 3;
const props = hasProps ? this.decodeObject() : null;
return new OpSplit(path, pos, props);
}
case OPCODE.starts: {
const ignoreCase = length > 3;
const path = this.decodePath(parent);
const value = this.decodeString();
return new OpStarts(path, value, ignoreCase);
}
case OPCODE.str_del: {
const hasStr = length < 5;
const path = this.decodeArray() as Path;
const pos = this.val() as number;
if (hasStr) {
const str = this.decodeString();
return new OpStrDel(path, pos, str, undefined);
} else {
this.reader.u8();
const len = this.val() as number;
return new OpStrDel(path, pos, undefined, len);
}
}
case OPCODE.str_ins: {
const path = this.decodeArray() as Path;
const pos = this.val() as number;
const str = this.decodeString();
return new OpStrIns(path, pos, str);
}
case OPCODE.test: {
const not = length > 3;
const path = this.decodePath(parent);
const value = this.val();
return new OpTest(path, value, not);
}
case OPCODE.test_string: {
const not = length > 4;
const path = this.decodePath(parent);
const pos = this.val() as number;
const str = this.decodeString();
return new OpTestString(path, pos, str, not);
}
case OPCODE.test_string_len: {
const not = length > 3;
const path = this.decodePath(parent);
const len = this.val() as number;
return new OpTestStringLen(path, len, not);
}
case OPCODE.test_type: {
const path = this.decodePath(parent);
const type = this.decodeArray() as JsonPatchTypes[];
return new OpTestType(path, type);
}
case OPCODE.type: {
const path = this.decodePath(parent);
const value = this.decodeString() as JsonPatchTypes;
return new OpType(path, value);
}
case OPCODE.undefined: {
const path = this.decodePath(parent);
return new OpUndefined(path);
}
}
throw new Error('OP_UNKNOWN');
}
protected decodePath(parent: Op | undefined): Path {
const path = this.decodeArray() as Path;
if (!parent) return path;
return [...parent.path, ...path];
}
protected decodeObject(): object {
const reader = this.reader;
const byte = reader.u8();
if (byte <= 0xbf) return this.obj(byte & 0b1111);
else Eif (byte === 0xde) return this.obj(reader.u16());
/* 0xdf */ else return this.obj(reader.u32());
}
protected decodeArray(): unknown[] {
const reader = this.reader;
const byte = reader.u8();
if (byte < 0b10011111) return this.arr(byte & 0b1111);
else Eif (byte === 0xdc) return this.arr(reader.u16());
else return this.arr(reader.u32());
}
protected decodeArrayHeader(): number {
const reader = this.reader;
const byte = reader.u8();
if (byte < 0b10011111) return byte & 0b1111;
else Eif (byte === 0xdc) return reader.u16();
else return reader.u32();
}
protected decodeString(): string {
const reader = this.reader;
const byte = reader.u8();
if (byte <= 0xbf) return reader.utf8(byte & 0b11111);
else if (byte === 0xd9) return reader.utf8(reader.u8());
else Eif (byte === 0xda) return reader.utf8(reader.u16());
/* 0xDB */ else return reader.utf8(reader.u32());
}
}
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