| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| /** |
| * @author Igor Ostapenko |
| */ |
| 'use strict'; |
| |
| const Bytecode = require('../../../../process/bytecode'); |
| const t = require('../../../../process/traversal'); |
| |
| module.exports = class BytecodeSerializer { |
| constructor(ioc) { |
| this.ioc = ioc; |
| this.ioc.serializers[ioc.DataType.BYTECODE] = this; |
| } |
| |
| canBeUsedFor(value) { |
| return value instanceof Bytecode || value instanceof t.Traversal; |
| } |
| |
| serialize(item, fullyQualifiedFormat = true) { |
| if (item === undefined || item === null) { |
| if (fullyQualifiedFormat) { |
| return Buffer.from([this.ioc.DataType.BYTECODE, 0x01]); |
| } |
| const steps_length = [0x00, 0x00, 0x00, 0x00]; // 0 |
| const sources_length = [0x00, 0x00, 0x00, 0x00]; // 0 |
| return Buffer.from([...steps_length, ...sources_length]); |
| } |
| |
| if (item instanceof t.Traversal) { |
| item = item.getBytecode(); |
| } |
| |
| const bufs = []; |
| if (fullyQualifiedFormat) { |
| bufs.push(Buffer.from([this.ioc.DataType.BYTECODE, 0x00])); |
| } |
| |
| // {steps_length}{step_0}...{step_n} |
| bufs.push(this.ioc.intSerializer.serialize(item.stepInstructions.length, false)); // TODO: what if steps_length > INT32_MAX |
| for (let i = 0; i < item.stepInstructions.length; i++) { |
| // {step_i} is composed of {name}{values_length}{value_0}...{value_n} |
| const step = item.stepInstructions[i]; |
| const name = step[0]; |
| const values_length = step.length - 1; |
| bufs.push(this.ioc.stringSerializer.serialize(name, false)); |
| bufs.push(this.ioc.intSerializer.serialize(values_length, false)); |
| for (let j = 0; j < values_length; j++) { |
| bufs.push(this.ioc.anySerializer.serialize(step[1 + j], true)); |
| } |
| } |
| |
| // {sources_length}{source_0}...{source_n} |
| bufs.push(this.ioc.intSerializer.serialize(item.sourceInstructions.length, false)); // TODO: what if sources_length > INT32_MAX |
| for (let i = 0; i < item.sourceInstructions.length; i++) { |
| // {source_i} is composed of {name}{values_length}{value_0}...{value_n} |
| const source = item.sourceInstructions[i]; |
| const name = source[0]; |
| const values_length = source.length - 1; |
| bufs.push(this.ioc.stringSerializer.serialize(name, false)); |
| bufs.push(this.ioc.intSerializer.serialize(values_length, false)); |
| for (let j = 0; j < values_length; j++) { |
| bufs.push(this.ioc.anySerializer.serialize(source[1 + j], true)); |
| } |
| } |
| |
| return Buffer.concat(bufs); |
| } |
| |
| deserialize(buffer, fullyQualifiedFormat = true) { |
| let len = 0; |
| let cursor = buffer; |
| |
| try { |
| if (buffer === undefined || buffer === null || !(buffer instanceof Buffer)) { |
| throw new Error('buffer is missing'); |
| } |
| if (buffer.length < 1) { |
| throw new Error('buffer is empty'); |
| } |
| |
| if (fullyQualifiedFormat) { |
| const type_code = cursor.readUInt8(); |
| len++; |
| if (type_code !== this.ioc.DataType.BYTECODE) { |
| throw new Error('unexpected {type_code}'); |
| } |
| cursor = cursor.slice(1); |
| |
| if (cursor.length < 1) { |
| throw new Error('{value_flag} is missing'); |
| } |
| const value_flag = cursor.readUInt8(); |
| len++; |
| if (value_flag === 1) { |
| return { v: null, len }; |
| } |
| if (value_flag !== 0) { |
| throw new Error('unexpected {value_flag}'); |
| } |
| cursor = cursor.slice(1); |
| } |
| |
| const v = new Bytecode(); |
| |
| // steps |
| |
| let steps_length, steps_length_len; |
| try { |
| ({ v: steps_length, len: steps_length_len } = this.ioc.intSerializer.deserialize(cursor, false)); |
| len += steps_length_len; |
| } catch (err) { |
| err.message = '{steps_length}: ' + err.message; |
| throw err; |
| } |
| if (steps_length < 0) { |
| throw new Error('{steps_length} is less than zero'); |
| } |
| cursor = cursor.slice(steps_length_len); |
| |
| // {step_i} is composed of {name}{values_length}{value_0}...{value_n} |
| for (let i = 0; i < steps_length; i++) { |
| // {name} is a String |
| let name, name_len; |
| try { |
| ({ v: name, len: name_len } = this.ioc.stringSerializer.deserialize(cursor, false)); |
| len += name_len; |
| } catch (err) { |
| err.message = `{step_${i}} {name}: ` + err.message; |
| throw err; |
| } |
| cursor = cursor.slice(name_len); |
| |
| // {values_length} is an Int describing the amount values |
| let values_length, values_length_len; |
| try { |
| ({ v: values_length, len: values_length_len } = this.ioc.intSerializer.deserialize(cursor, false)); |
| len += values_length_len; |
| } catch (err) { |
| err.message = `{step_${i}} {values_length}: ` + err.message; |
| throw err; |
| } |
| if (values_length < 0) { |
| throw new Error(`{step_${i}} {values_length} is less than zero`); |
| } |
| cursor = cursor.slice(values_length_len); |
| |
| // {value_i} is a fully qualified typed value composed of {type_code}{type_info}{value_flag}{value} describing the step argument |
| const values = []; |
| let value, value_len; |
| for (let j = 0; j < values_length; j++) { |
| try { |
| ({ v: value, len: value_len } = this.ioc.anySerializer.deserialize(cursor)); |
| len += value_len; |
| values.push(value); |
| } catch (err) { |
| err.message = `{step_${i}} {value_${j}}: ` + err.message; |
| throw err; |
| } |
| cursor = cursor.slice(value_len); |
| } |
| |
| v.addStep(name, values); |
| } |
| |
| // sources |
| |
| let sources_length, sources_length_len; |
| try { |
| ({ v: sources_length, len: sources_length_len } = this.ioc.intSerializer.deserialize(cursor, false)); |
| len += sources_length_len; |
| } catch (err) { |
| err.message = '{sources_length}: ' + err.message; |
| throw err; |
| } |
| if (sources_length < 0) { |
| throw new Error('{sources_length} is less than zero'); |
| } |
| cursor = cursor.slice(sources_length_len); |
| |
| // {source_i} is composed of {name}{values_length}{value_0}...{value_n} |
| for (let i = 0; i < sources_length; i++) { |
| // {name} is a String |
| let name, name_len; |
| try { |
| ({ v: name, len: name_len } = this.ioc.stringSerializer.deserialize(cursor, false)); |
| len += name_len; |
| } catch (err) { |
| err.message = `{source_${i}} {name}: ` + err.message; |
| throw err; |
| } |
| cursor = cursor.slice(name_len); |
| |
| // {values_length} is an Int describing the amount values |
| let values_length, values_length_len; |
| try { |
| ({ v: values_length, len: values_length_len } = this.ioc.intSerializer.deserialize(cursor, false)); |
| len += values_length_len; |
| } catch (err) { |
| err.message = `{source_${i}} {values_length}: ` + err.message; |
| throw err; |
| } |
| if (values_length < 0) { |
| throw new Error(`{source_${i}} {values_length} is less than zero`); |
| } |
| cursor = cursor.slice(values_length_len); |
| |
| // {value_i} is a fully qualified typed value composed of {type_code}{type_info}{value_flag}{value} |
| const values = []; |
| let value, value_len; |
| for (let j = 0; j < values_length; j++) { |
| try { |
| ({ v: value, len: value_len } = this.ioc.anySerializer.deserialize(cursor)); |
| len += value_len; |
| values.push(value); |
| } catch (err) { |
| err.message = `{source_${i}} {value_${j}}: ` + err.message; |
| throw err; |
| } |
| cursor = cursor.slice(value_len); |
| } |
| |
| v.addSource(name, values); |
| } |
| |
| return { v, len }; |
| } catch (err) { |
| throw this.ioc.utils.des_error({ serializer: this, args: arguments, cursor, err }); |
| } |
| } |
| }; |