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Düzenlenen Dosya: HermesParserDeserializer.js

/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * 
 * @format
 */
'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _HermesParserDecodeUTF8String = _interopRequireDefault(require("./HermesParserDecodeUTF8String"));

var _HermesParserNodeDeserializers = _interopRequireDefault(require("./HermesParserNodeDeserializers"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

class HermesParserDeserializer {
  // Matches StoredComment::Kind enum in JSLexer.h
  // Matches TokenType enum in HermesParserJSSerializer.h
  constructor(programBuffer, positionBuffer, positionBufferSize, wasmParser, options) {
    this.programBufferIdx = void 0;
    this.positionBufferIdx = void 0;
    this.positionBufferSize = void 0;
    this.locMap = void 0;
    this.HEAPU8 = void 0;
    this.HEAPU32 = void 0;
    this.HEAPF64 = void 0;
    this.options = void 0;
    this.commentTypes = ['CommentLine', 'CommentBlock', 'InterpreterDirective'];
    this.tokenTypes = ['Boolean', 'Identifier', 'Keyword', 'Null', 'Numeric', 'BigInt', 'Punctuator', 'String', 'RegularExpression', 'Template', 'JSXText'];
    // Program and position buffer are memory addresses, so we must convert
    // into indices into HEAPU32 (an array of 4-byte integers).
    this.programBufferIdx = programBuffer / 4;
    this.positionBufferIdx = positionBuffer / 4;
    this.positionBufferSize = positionBufferSize;
    this.locMap = {};
    this.HEAPU8 = wasmParser.HEAPU8;
    this.HEAPU32 = wasmParser.HEAPU32;
    this.HEAPF64 = wasmParser.HEAPF64;
    this.options = options;
  }
  /**
   * Consume and return the next 4 bytes in the program buffer.
   */

next() {
    const num = this.HEAPU32[this.programBufferIdx++];
    return num;
  }

deserialize() {
    const program = {
      type: 'Program',
      loc: this.addEmptyLoc(),
      body: this.deserializeNodeList(),
      comments: this.deserializeComments()
    };

if (this.options.tokens === true) {
      program.tokens = this.deserializeTokens();
    }

this.fillLocs();
    return program;
  }
  /**
   * Booleans are serialized as a single 4-byte integer.
   */

deserializeBoolean() {
    return Boolean(this.next());
  }
  /**
   * Numbers are serialized directly into program buffer, taking up 8 bytes
   * preceded by 4 bytes of alignment padding if necessary.
   */

deserializeNumber() {
    let floatIdx; // Numbers are aligned on 8-byte boundaries, so skip padding if we are at
    // an odd index into the 4-byte aligned program buffer.

if (this.programBufferIdx % 2 === 0) {
      floatIdx = this.programBufferIdx / 2;
      this.programBufferIdx += 2;
    } else {
      floatIdx = (this.programBufferIdx + 1) / 2;
      this.programBufferIdx += 3;
    }

return this.HEAPF64[floatIdx];
  }
  /**
   * Strings are serialized as a 4-byte pointer into the heap, followed
   * by their size as a 4-byte integer. The size is only present if the
   * pointer is non-null.
   */

deserializeString() {
    const ptr = this.next();

if (ptr === 0) {
      return null;
    }

const size = this.next();
    return (0, _HermesParserDecodeUTF8String.default)(ptr, size, this.HEAPU8);
  }
  /**
   * Nodes are serialized as a 4-byte integer denoting their node kind,
   * followed by a 4-byte loc ID, followed by serialized node properties.
   *
   * If the node kind is 0 the node is null, otherwise the node kind - 1 is an
   * index into the array of node deserialization functions.
   */

deserializeNode() {
    const nodeType = this.next();

if (nodeType === 0) {
      return null;
    }

const nodeDeserializer = _HermesParserNodeDeserializers.default[nodeType - 1].bind(this);

return nodeDeserializer();
  }
  /**
   * Node lists are serialized as a 4-byte integer denoting the number of
   * elements in the list, followed by the serialized elements.
   */

deserializeNodeList() {
    const size = this.next();
    const nodeList = [];

for (let i = 0; i < size; i++) {
      nodeList.push(this.deserializeNode());
    }

return nodeList;
  }
  /**
   * Comments are serialized as a node list, where each comment is serialized
   * as a 4-byte integer denoting comment type, followed by a 4-byte value
   * denoting the loc ID, followed by a serialized string for the comment value.
   */

deserializeComments() {
    const size = this.next();
    const comments = [];

for (let i = 0; i < size; i++) {
      const commentType = this.commentTypes[this.next()];
      const loc = this.addEmptyLoc();
      const value = this.deserializeString();
      comments.push({
        type: commentType,
        loc,
        value
      });
    }

return comments;
  }

deserializeTokens() {
    const size = this.next();
    const tokens = [];

for (let i = 0; i < size; i++) {
      const tokenType = this.tokenTypes[this.next()];
      const loc = this.addEmptyLoc();
      const value = this.deserializeString();
      tokens.push({
        type: tokenType,
        loc,
        value
      });
    }

return tokens;
  }
  /**
   * While deserializing the AST locations are represented by
   * a 4-byte loc ID. This is used to create a map of loc IDs to empty loc
   * objects that are filled after the AST has been deserialized.
   */

addEmptyLoc() {
    // $FlowExpectedError
    const loc = {};
    this.locMap[this.next()] = loc;
    return loc;
  }
  /**
   * Positions are serialized as a loc ID which denotes which loc it is associated with,
   * followed by kind which denotes whether it is a start or end position,
   * followed by line, column, and offset (4-bytes each).
   */

fillLocs() {
    for (let i = 0; i < this.positionBufferSize; i++) {
      const locId = this.HEAPU32[this.positionBufferIdx++];
      const kind = this.HEAPU32[this.positionBufferIdx++];
      const line = this.HEAPU32[this.positionBufferIdx++];
      const column = this.HEAPU32[this.positionBufferIdx++];
      const offset = this.HEAPU32[this.positionBufferIdx++];
      const loc = this.locMap[locId];

if (kind === 0) {
        loc.start = {
          line,
          column
        };
        loc.rangeStart = offset;
      } else {
        loc.end = {
          line,
          column
        };
        loc.rangeEnd = offset;
      }
    }
  }

}

exports.default = HermesParserDeserializer;

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