Function CallExpression

src/javascript/files.ts:97–116

(node, state, stack)

  // you can’t reference a global file as a file attachment.
  ancestor(body, {
    CallExpression(node, state, stack) {
      const {callee} = node;
      if (callee.type !== "Identifier" || !alias.has(callee.name) || !references.has(callee)) return;
      const args = node.arguments;
      if (args.length !== 1) throw syntaxError("FileAttachment requires a single literal string argument", node, input);
      const [arg] = args;
      if (!isStringLiteral(arg)) throw syntaxError("FileAttachment requires a single literal string argument", node, input); // prettier-ignore
      const fileName = getStringLiteralValue(arg);
      const filePath = resolveLocalPath(path, fileName);
      if (!filePath) throw syntaxError(`non-local file path: ${fileName}`, node, input);
      const parent = stack[stack.length - 2];
      const name = relativePath(path, filePath);
      const method =
        parent && isMemberExpression(parent) && parent.property.type === "Identifier"
          ? parent.property.name === "arquero" && /\.parquet$/i.test(fileName)
            ? "arquero-parquet" // FileAttachment("foo.parquet").arquero
            : parent.property.name // FileAttachment("foo.csv").csv
          : KNOWN_FILE_EXTENSIONS[extname(fileName).toLowerCase()]; // bare FileAttachment("foo.csv")
      files.push({node, name, method});
    }
  });

  return files;