@react-navigation/devtools/lib/module/parseHermesStack.js

Developer tools for React Navigation

"use strict";

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

// Capturing groups:
// 1. function name
// 2. is this a native stack frame?
// 3. is this a bytecode address or a source location?
// 4. source URL (filename)
// 5. line number (1 based)
// 6. column number (1 based) or virtual offset (0 based)
const RE_FRAME = /^ {0,4}at (.+?)(?: \((native)\)?| \((address at )?(.*?):(\d+):(\d+)\))$/;

// Capturing groups:
// 1. count of skipped frames
const RE_SKIPPED = /^ {0,4}... skipping (\d) frames$/;
function parseLine(line) {
  const asFrame = line.match(RE_FRAME);
  if (asFrame) {
    return {
      type: 'FRAME',
      functionName: asFrame[1],
      location: asFrame[2] === 'native' ? {
        type: 'NATIVE'
      } : asFrame[3] === 'address at ' ? {
        type: 'BYTECODE',
        sourceUrl: asFrame[4],
        line1Based: Number.parseInt(asFrame[5], 10),
        virtualOffset0Based: Number.parseInt(asFrame[6], 10)
      } : {
        type: 'SOURCE',
        sourceUrl: asFrame[4],
        line1Based: Number.parseInt(asFrame[5], 10),
        column1Based: Number.parseInt(asFrame[6], 10)
      }
    };
  }
  const asSkipped = line.match(RE_SKIPPED);
  if (asSkipped) {
    return {
      type: 'SKIPPED',
      count: Number.parseInt(asSkipped[1], 10)
    };
  }
  return undefined;
}
export function parseHermesStack(stack) {
  const lines = stack.split(/\n/);
  let entries = [];
  let lastMessageLine = -1;
  for (let i = 0; i < lines.length; ++i) {
    const line = lines[i];
    if (!line) {
      continue;
    }
    const entry = parseLine(line);
    if (entry) {
      entries.push(entry);
      continue;
    }
    // No match - we're still in the message
    lastMessageLine = i;
    entries = [];
  }
  const message = lines.slice(0, lastMessageLine + 1).join('\n');
  return {
    message,
    entries
  };
}
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