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backend/node_modules/sucrase/dist/computeSourceMap.js

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+"use strict";Object.defineProperty(exports, "__esModule", {value: true});var _genmapping = require('@jridgewell/gen-mapping');
+
+
+
+var _charcodes = require('./parser/util/charcodes');
+
+
+
+
+
+
+
+
+
+
+
+
+/**
+ * Generate a source map indicating that each line maps directly to the original line,
+ * with the tokens in their new positions.
+ */
+ function computeSourceMap(
+  {code: generatedCode, mappings: rawMappings},
+  filePath,
+  options,
+  source,
+  tokens,
+) {
+  const sourceColumns = computeSourceColumns(source, tokens);
+  const map = new (0, _genmapping.GenMapping)({file: options.compiledFilename});
+  let tokenIndex = 0;
+  // currentMapping is the output source index for the current input token being
+  // considered.
+  let currentMapping = rawMappings[0];
+  while (currentMapping === undefined && tokenIndex < rawMappings.length - 1) {
+    tokenIndex++;
+    currentMapping = rawMappings[tokenIndex];
+  }
+  let line = 0;
+  let lineStart = 0;
+  if (currentMapping !== lineStart) {
+    _genmapping.maybeAddSegment.call(void 0, map, line, 0, filePath, line, 0);
+  }
+  for (let i = 0; i < generatedCode.length; i++) {
+    if (i === currentMapping) {
+      const genColumn = currentMapping - lineStart;
+      const sourceColumn = sourceColumns[tokenIndex];
+      _genmapping.maybeAddSegment.call(void 0, map, line, genColumn, filePath, line, sourceColumn);
+      while (
+        (currentMapping === i || currentMapping === undefined) &&
+        tokenIndex < rawMappings.length - 1
+      ) {
+        tokenIndex++;
+        currentMapping = rawMappings[tokenIndex];
+      }
+    }
+    if (generatedCode.charCodeAt(i) === _charcodes.charCodes.lineFeed) {
+      line++;
+      lineStart = i + 1;
+      if (currentMapping !== lineStart) {
+        _genmapping.maybeAddSegment.call(void 0, map, line, 0, filePath, line, 0);
+      }
+    }
+  }
+  const {sourceRoot, sourcesContent, ...sourceMap} = _genmapping.toEncodedMap.call(void 0, map);
+  return sourceMap ;
+} exports.default = computeSourceMap;
+
+/**
+ * Create an array mapping each token index to the 0-based column of the start
+ * position of the token.
+ */
+function computeSourceColumns(code, tokens) {
+  const sourceColumns = new Array(tokens.length);
+  let tokenIndex = 0;
+  let currentMapping = tokens[tokenIndex].start;
+  let lineStart = 0;
+  for (let i = 0; i < code.length; i++) {
+    if (i === currentMapping) {
+      sourceColumns[tokenIndex] = currentMapping - lineStart;
+      tokenIndex++;
+      currentMapping = tokens[tokenIndex].start;
+    }
+    if (code.charCodeAt(i) === _charcodes.charCodes.lineFeed) {
+      lineStart = i + 1;
+    }
+  }
+  return sourceColumns;
+}