Function escapeInStrings

packages/compiler/src/shadow_css.ts:1148–1173

* Parse the provided css text and inside strings (meaning, inside pairs of unescaped single or * double quotes) replace specific characters with their respective placeholders as indicated * by the `ESCAPE_IN_STRING_MAP` map. * * For example convert the text * `animation: "my-anim:at\"ion" 1s;`

(input: string)

 * @returns the css text with specific characters in strings replaced by placeholders.
 **/
function escapeInStrings(input: string): string {
  let result = input;
  let currentQuoteChar: string | null = null;
  for (let i = 0; i < result.length; i++) {
    const char = result[i];
    if (char === '\\') {
      i++;
    } else {
      if (currentQuoteChar !== null) {
        // index i is inside a quoted sub-string
        if (char === currentQuoteChar) {
          currentQuoteChar = null;
        } else {
          const placeholder: string | undefined = ESCAPE_IN_STRING_MAP[char];
          if (placeholder) {
            result = `${result.substr(0, i)}${placeholder}${result.substr(i + 1)}`;
            i += placeholder.length - 1;
          }
        }
      } else if (char === "'" || char === '"') {
        currentQuoteChar = char;
      }
    }
  }
  return result;
}

/**
 * Replace in a string all occurrences of keys in the `ESCAPE_IN_STRING_MAP` map with their