Function readStringContents

packages/babel-helper-string-parser/src/index.ts:49–120

(
  type: "single" | "double" | "template",
  input: string,
  pos: number,
  lineStart: number,
  curLine: number,
  errors: StringContentsErrorHandlers,
)

};

export function readStringContents(
  type: "single" | "double" | "template",
  input: string,
  pos: number,
  lineStart: number,
  curLine: number,
  errors: StringContentsErrorHandlers,
) {
  const initialPos = pos;
  const initialLineStart = lineStart;
  const initialCurLine = curLine;

  let out = "";
  let firstInvalidLoc = null;
  let chunkStart = pos;
  const { length } = input;
  for (;;) {
    if (pos >= length) {
      errors.unterminated(initialPos, initialLineStart, initialCurLine);
      out += input.slice(chunkStart, pos);
      break;
    }
    const ch = input.charCodeAt(pos);
    if (isStringEnd(type, ch, input, pos)) {
      out += input.slice(chunkStart, pos);
      break;
    }
    if (ch === charCodes.backslash) {
      out += input.slice(chunkStart, pos);
      const res = readEscapedChar(
        input,
        pos,
        lineStart,
        curLine,
        type === "template",
        errors,
      );
      if (res.ch === null && !firstInvalidLoc) {
        firstInvalidLoc = { pos, lineStart, curLine };
      } else {
        out += res.ch;
      }
      ({ pos, lineStart, curLine } = res);
      chunkStart = pos;
    } else if (
      ch === charCodes.lineSeparator ||
      ch === charCodes.paragraphSeparator
    ) {
      ++pos;
      ++curLine;
      lineStart = pos;
    } else if (ch === charCodes.lineFeed || ch === charCodes.carriageReturn) {
      if (type === "template") {
        out += input.slice(chunkStart, pos) + "\n";
        ++pos;
        if (
          ch === charCodes.carriageReturn &&
          input.charCodeAt(pos) === charCodes.lineFeed