Quelle source-map.js Sprache: JAVA

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */

"use strict";

/**
* Source Map Worker
* @module utils/source-map-worker
*/

const {
  SourceMapConsumer,
} = require("resource://devtools/client/shared/vendor/source-map/source-map.js");

// Initialize the source-map library right away so that all other code can use it.
SourceMapConsumer.initialize({
  "lib/mappings.wasm":
    "resource://devtools/client/shared/vendor/source-map/lib/mappings.wasm",
});

const {
  networkRequest,
} = require("resource://devtools/client/shared/source-map-loader/utils/network-request.js");
const assert = require("resource://devtools/client/shared/source-map-loader/utils/assert.js");
const {
  fetchSourceMap,
  resolveSourceMapURL,
  hasOriginalURL,
  clearOriginalURLs,
} = require("resource://devtools/client/shared/source-map-loader/utils/fetchSourceMap.js");
const {
  getSourceMap,
  getSourceMapWithMetadata,
  setSourceMap,
  clearSourceMaps: clearSourceMapsRequests,
} = require("resource://devtools/client/shared/source-map-loader/utils/sourceMapRequests.js");
const {
  originalToGeneratedId,
  generatedToOriginalId,
  isGeneratedId,
  isOriginalId,
  getContentType,
} = require("resource://devtools/client/shared/source-map-loader/utils/index.js");
const {
  clearWasmXScopes,
} = require("resource://devtools/client/shared/source-map-loader/wasm-dwarf/wasmXScopes.js");

/**
* Create "original source info" objects being handed over to the main thread
* to describe original sources referenced in a source map
*/
function mapToOriginalSourceInfos(generatedId, urls) {
  return urls.map(url => {
    return {
      id: generatedToOriginalId(generatedId, url),
      url,
    };
  });
}

/**
* Load the source map and retrieved infos about all the original sources
* referenced in that source map.
*
* @param {Object} generatedSource
*        Source object for a bundle referencing a source map
* @return {Array<Object>|null}
*        List of object with id and url attributes describing the original sources.
*/
async function getOriginalURLs(generatedSource) {
  const { resolvedSourceMapURL, baseURL } =
    resolveSourceMapURL(generatedSource);
  const map = await fetchSourceMap(
    generatedSource,
    resolvedSourceMapURL,
    baseURL
  );
  return map ? mapToOriginalSourceInfos(generatedSource.id, map.sources) : null;
}

/**
* Load the source map for a given bundle and return information
* about the related original sources and the source map itself.
*
* @param {Object} generatedSource
*        Source object for the bundle.
* @return {Object}
*  - {Array<Object>} sources
*    Object with id and url attributes, refering to the related original sources
*    referenced in the source map.
*  - [String} resolvedSourceMapURL
*    Absolute URL for the source map file.
*  - {Array<String>} ignoreListUrls
*    List of URLs of sources, designated by the source map, to be ignored in the debugger.
*  - {String} exception
*    In case of error, a string describing the situation.
*/
async function loadSourceMap(generatedSource) {
  const { resolvedSourceMapURL, baseURL } =
    resolveSourceMapURL(generatedSource);
  try {
    const map = await fetchSourceMap(
      generatedSource,
      resolvedSourceMapURL,
      baseURL
    );
    if (!map.sources.length) {
      throw new Error("No sources are declared in this source map.");
    }
    let ignoreListUrls = [];
    if (map.x_google_ignoreList?.length) {
      ignoreListUrls = map.x_google_ignoreList.map(
        sourceIndex => map.sources[sourceIndex]
      );
    }
    return {
      sources: mapToOriginalSourceInfos(generatedSource.id, map.sources),
      resolvedSourceMapURL,
      ignoreListUrls,
    };
  } catch (e) {
    return {
      sources: [],
      resolvedSourceMapURL,
      ignoreListUrls: [],
      exception: e.message,
    };
  }
}

const COMPUTED_SPANS = new WeakSet();

const SOURCE_MAPPINGS = new WeakMap();
async function getOriginalRanges(sourceId) {
  if (!isOriginalId(sourceId)) {
    return [];
  }

  const generatedSourceId = originalToGeneratedId(sourceId);
  const data = await getSourceMapWithMetadata(generatedSourceId);
  if (!data) {
    return [];
  }
  const { map } = data;
  const url = data.urlsById.get(sourceId);

  let mappings = SOURCE_MAPPINGS.get(map);
  if (!mappings) {
    mappings = new Map();
    SOURCE_MAPPINGS.set(map, mappings);
  }

  let fileMappings = mappings.get(url);
  if (!fileMappings) {
    fileMappings = [];
    mappings.set(url, fileMappings);

    const originalMappings = fileMappings;
    map.eachMapping(
      mapping => {
        if (mapping.source !== url) {
          return;
        }

        const last = originalMappings[originalMappings.length - 1];

        if (last && last.line === mapping.originalLine) {
          if (last.columnStart < mapping.originalColumn) {
            last.columnEnd = mapping.originalColumn;
          } else {
            // Skip this duplicate original location,
            return;
          }
        }

        originalMappings.push({
          line: mapping.originalLine,
          columnStart: mapping.originalColumn,
          columnEnd: Infinity,
        });
      },
      null,
      SourceMapConsumer.ORIGINAL_ORDER
    );
  }

  return fileMappings;
}

/**
* Given an original location, find the ranges on the generated file that
* are mapped from the original range containing the location.
*/
async function getGeneratedRanges(location) {
  if (!isOriginalId(location.sourceId)) {
    return [];
  }

  const generatedSourceId = originalToGeneratedId(location.sourceId);
  const data = await getSourceMapWithMetadata(generatedSourceId);
  if (!data) {
    return [];
  }
  const { urlsById, map } = data;

  if (!COMPUTED_SPANS.has(map)) {
    COMPUTED_SPANS.add(map);
    map.computeColumnSpans();
  }

  // We want to use 'allGeneratedPositionsFor' to get the _first_ generated
  // location, but it hard-codes SourceMapConsumer.LEAST_UPPER_BOUND as the
  // bias, making it search in the wrong direction for this usecase.
  // To work around this, we use 'generatedPositionFor' and then look up the
  // exact original location, making any bias value unnecessary, and then
  // use that location for the call to 'allGeneratedPositionsFor'.
  const genPos = map.generatedPositionFor({
    source: urlsById.get(location.sourceId),
    line: location.line,
    column: location.column == null ? 0 : location.column,
    bias: SourceMapConsumer.GREATEST_LOWER_BOUND,
  });
  if (genPos.line === null) {
    return [];
  }

  const positions = map.allGeneratedPositionsFor(
    map.originalPositionFor({
      line: genPos.line,
      column: genPos.column,
    })
  );

  return positions
    .map(mapping => ({
      line: mapping.line,
      columnStart: mapping.column,
      columnEnd: mapping.lastColumn,
    }))
    .sort((a, b) => {
      const line = a.line - b.line;
      return line === 0 ? a.column - b.column : line;
    });
}

async function getGeneratedLocation(location) {
  if (!isOriginalId(location.sourceId)) {
    return null;
  }

  const generatedSourceId = originalToGeneratedId(location.sourceId);
  const data = await getSourceMapWithMetadata(generatedSourceId);
  if (!data) {
    return null;
  }
  const { urlsById, map } = data;

  const positions = map.allGeneratedPositionsFor({
    source: urlsById.get(location.sourceId),
    line: location.line,
    column: location.column == null ? 0 : location.column,
  });

  // Prior to source-map 0.7, the source-map module returned the earliest
  // generated location in the file when there were multiple generated
  // locations. The current comparison fn in 0.7 does not appear to take
  // generated location into account properly.
  let match;
  for (const pos of positions) {
    if (!match || pos.line < match.line || pos.column < match.column) {
      match = pos;
    }
  }

  if (!match) {
    match = map.generatedPositionFor({
      source: urlsById.get(location.sourceId),
      line: location.line,
      column: location.column == null ? 0 : location.column,
      bias: SourceMapConsumer.LEAST_UPPER_BOUND,
    });
  }

  return {
    sourceId: generatedSourceId,
    line: match.line,
    column: match.column,
  };
}

/**
* Map the breakable positions (line and columns) from generated to original locations.
*
* @param {Object} breakpointPositions
*        List of columns per line refering to the breakable columns per line
*        for a given source:
*        {
*           1: [2, 6], // On line 1, column 2 and 6 are breakable.
*           ...
*        }
* @param {string} sourceId
*        The ID for the generated source.
*/
async function getOriginalLocations(breakpointPositions, sourceId) {
  const map = await getSourceMap(sourceId);
  if (!map) {
    return null;
  }
  for (const line in breakpointPositions) {
    const breakableColumnsPerLine = breakpointPositions[line];
    for (let i = 0; i < breakableColumnsPerLine.length; i++) {
      const column = breakableColumnsPerLine[i];
      const mappedLocation = getOriginalLocationSync(map, {
        sourceId,
        line: parseInt(line, 10),
        column,
      });
      if (mappedLocation) {
        // As we replace the `column` with the mappedLocation,
        // also transfer the generated column so that we can compute both original and generated locations
        // in the main thread.
        mappedLocation.generatedColumn = column;
        breakableColumnsPerLine[i] = mappedLocation;
      }
    }
  }
  return breakpointPositions;
}

/**
* Query the source map for a mapping from bundle location to original location.
*
* @param {SourceMapConsumer} map
*        The source map for the bundle source.
* @param {Object} location
*        A location within a bundle to map to an original location.
* @param {Object} options
* @param {Boolean} options.looseSearch
*        Optional, if true, will do a loose search on first column and next lines
*        until a mapping is found.
* @return {location}
*        The mapped location in the original source.
*/
function getOriginalLocationSync(map, location, { looseSearch = false } = {}) {
  // First check for an exact match
  let match = map.originalPositionFor({
    line: location.line,
    column: location.column == null ? 0 : location.column,
  });

  // Then check for a loose match by sliding to first column and next lines
  if (match.sourceUrl == null && looseSearch) {
    let line = location.line;
    // if a non-0 column was passed, we want to do the search from the beginning of the line,
    // otherwise, we can start looking into next lines
    let firstLineChecked = (location.column || 0) !== 0;

    // Avoid looping through the whole file and limit the sliding search to the next 10 lines.
    while (match.sourceUrl === null && line < location.line + 10) {
      if (firstLineChecked) {
        line++;
      } else {
        firstLineChecked = true;
      }
      match = map.originalPositionFor({
        line,
        column: 0,
        bias: SourceMapConsumer.LEAST_UPPER_BOUND,
      });
    }
  }

  const { source: sourceUrl, line, column } = match;

  if (sourceUrl == null) {
    // No url means the location didn't map.
    return null;
  }

  return {
    sourceId: generatedToOriginalId(location.sourceId, sourceUrl),
    sourceUrl,
    line,
    column,
  };
}

/**
* Map a bundle location to an original one.
*
* @param {Object} location
*        Bundle location
* @param {Object} options
*        See getORiginalLocationSync.
* @return {Object}
*        Original location
*/
async function getOriginalLocation(location, options) {
  if (!isGeneratedId(location.sourceId)) {
    return null;
  }

  const map = await getSourceMap(location.sourceId);
  if (!map) {
    return null;
  }

  return getOriginalLocationSync(map, location, options);
}

async function getOriginalSourceText(originalSourceId) {
  assert(isOriginalId(originalSourceId), "Source is not an original source");

  const generatedSourceId = originalToGeneratedId(originalSourceId);
  const data = await getSourceMapWithMetadata(generatedSourceId);
  if (!data) {
    return null;
  }
  const { urlsById, map } = data;

  const url = urlsById.get(originalSourceId);
  let text = map.sourceContentFor(url, true);
  if (!text) {
    try {
      const response = await networkRequest(url, {
        sourceMapBaseURL: map.sourceMapBaseURL,
        loadFromCache: false,
        allowsRedirects: false,
      });
      text = response.content;
    } catch (err) {
      // Workers exceptions are processed by worker-utils module and
      // only metadata attribute is transferred between threads.
      // Notify the main thread about which url failed loading.
      err.metadata = {
        url,
      };
      throw err;
    }
  }

  return {
    text,
    contentType: getContentType(url || ""),
  };
}

/**
* Find the set of ranges on the generated file that map from the original
* file's locations.
*
* @param sourceId - The original ID of the file we are processing.
* @param url - The original URL of the file we are processing.
* @param mergeUnmappedRegions - If unmapped regions are encountered between
*   two mappings for the given original file, allow the two mappings to be
*   merged anyway. This is useful if you are more interested in the general
*   contiguous ranges associated with a file, rather than the specifics of
*   the ranges provided by the sourcemap.
*/
const GENERATED_MAPPINGS = new WeakMap();
async function getGeneratedRangesForOriginal(
  sourceId,
  mergeUnmappedRegions = false
) {
  assert(isOriginalId(sourceId), "Source is not an original source");

  const data = await getSourceMapWithMetadata(originalToGeneratedId(sourceId));
  // NOTE: this is only needed for Flow
  if (!data) {
    return [];
  }
  const { urlsById, map } = data;
  const url = urlsById.get(sourceId);

  if (!COMPUTED_SPANS.has(map)) {
    COMPUTED_SPANS.add(map);
    map.computeColumnSpans();
  }

  if (!GENERATED_MAPPINGS.has(map)) {
    GENERATED_MAPPINGS.set(map, new Map());
  }

  const generatedRangesMap = GENERATED_MAPPINGS.get(map);
  if (!generatedRangesMap) {
    return [];
  }

  if (generatedRangesMap.has(sourceId)) {
    // NOTE we need to coerce the result to an array for Flow
    return generatedRangesMap.get(sourceId) || [];
  }

  // Gather groups of mappings on the generated file, with new groups created
  // if we cross a mapping for a different file.
  let currentGroup = [];
  const originalGroups = [currentGroup];
  map.eachMapping(
    mapping => {
      if (mapping.source === url) {
        currentGroup.push({
          start: {
            line: mapping.generatedLine,
            column: mapping.generatedColumn,
          },
          end: {
            line: mapping.generatedLine,
            // The lastGeneratedColumn value is an inclusive value so we add
            // one to it to get the exclusive end position.
            column: mapping.lastGeneratedColumn + 1,
          },
        });
      } else if (typeof mapping.source === "string" && currentGroup.length) {
        // If there is a URL, but it is for a _different_ file, we create a
        // new group of mappings so that we can tell
        currentGroup = [];
        originalGroups.push(currentGroup);
      }
    },
    null,
    SourceMapConsumer.GENERATED_ORDER
  );

  const generatedMappingsForOriginal = [];
  if (mergeUnmappedRegions) {
    // If we don't care about excluding unmapped regions, then we just need to
    // create a range that is the fully encompasses each group, ignoring the
    // empty space between each individual range.
    for (const group of originalGroups) {
      if (group.length) {
        generatedMappingsForOriginal.push({
          start: group[0].start,
          end: group[group.length - 1].end,
        });
      }
    }
  } else {
    let lastEntry;
    for (const group of originalGroups) {
      lastEntry = null;
      for (const { start, end } of group) {
        const lastEnd = lastEntry
          ? wrappedMappingPosition(lastEntry.end)
          : null;

        // If this entry comes immediately after the previous one, extend the
        // range of the previous entry instead of adding a new one.
        if (
          lastEntry &&
          lastEnd &&
          lastEnd.line === start.line &&
          lastEnd.column === start.column
        ) {
          lastEntry.end = end;
        } else {
          const newEntry = { start, end };
          generatedMappingsForOriginal.push(newEntry);
          lastEntry = newEntry;
        }
      }
    }
  }

  generatedRangesMap.set(sourceId, generatedMappingsForOriginal);
  return generatedMappingsForOriginal;
}

function wrappedMappingPosition(pos) {
  if (pos.column !== Infinity) {
    return pos;
  }

  // If the end of the entry consumes the whole line, treat it as wrapping to
  // the next line.
  return {
    line: pos.line + 1,
    column: 0,
  };
}

async function getFileGeneratedRange(originalSourceId) {
  assert(isOriginalId(originalSourceId), "Source is not an original source");

  const data = await getSourceMapWithMetadata(
    originalToGeneratedId(originalSourceId)
  );
  if (!data) {
    return null;
  }
  const { urlsById, map } = data;

  const start = map.generatedPositionFor({
    source: urlsById.get(originalSourceId),
    line: 1,
    column: 0,
    bias: SourceMapConsumer.LEAST_UPPER_BOUND,
  });

  const end = map.generatedPositionFor({
    source: urlsById.get(originalSourceId),
    line: Number.MAX_SAFE_INTEGER,
    column: Number.MAX_SAFE_INTEGER,
    bias: SourceMapConsumer.GREATEST_LOWER_BOUND,
  });

  return {
    start,
    end,
  };
}

/**
* Set the sourceMap for multiple passed source ids.
*
* @param {Array<string>} generatedSourceIds
* @param {Object} map: An actual sourcemap (as generated with SourceMapGenerator#toJSON)
*/
function setSourceMapForGeneratedSources(generatedSourceIds, map) {
  const sourceMapConsumer = new SourceMapConsumer(map);
  for (const generatedId of generatedSourceIds) {
    setSourceMap(generatedId, Promise.resolve(sourceMapConsumer));
  }
}

function clearSourceMaps() {
  clearSourceMapsRequests();
  clearWasmXScopes();
  clearOriginalURLs();
}

module.exports = {
  getOriginalURLs,
  loadSourceMap,
  hasOriginalURL,
  getOriginalRanges,
  getGeneratedRanges,
  getGeneratedLocation,
  getOriginalLocation,
  getOriginalLocations,
  getOriginalSourceText,
  getGeneratedRangesForOriginal,
  getFileGeneratedRange,
  setSourceMapForGeneratedSources,
  clearSourceMaps,
};

quality94%

¤ Dauer der Verarbeitung: 0.31 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.