Function parsePathWithParams

src/accept-path.ts:31–78

(url: string, pattern: string)

};

export function parsePathWithParams(url: string, pattern: string) {
  const data: Record<string, string> = {};

  let urlIndex = 0;
  let patternIndex = 0;

  while (true) {
    if (pattern[patternIndex] === ":") {
      // Start of param
      patternIndex++;
      let paramName = "";
      let paramValue = "";

      // Consume param name
      while (pattern[patternIndex] !== "/" && patternIndex <= pattern.length - 1) {
        paramName += pattern[patternIndex++];
      }

      // Consume param value
      while (url[urlIndex] !== "/" && url[urlIndex] !== "?" && urlIndex <= url.length - 1) {
        paramValue += url[urlIndex++];
      }

      if (paramName.length && paramValue.length) {
        data[paramName] = paramValue;
      }
    }

    const urlEnd = urlIndex === url.length || url[urlIndex] === "?";
    const patternEnd = patternIndex === pattern.length;

    if (urlEnd && patternEnd) {
      return data;
    } else if (urlEnd !== patternEnd) {
      // The length of pattern and url is different
      return;
    }

    if (url[urlIndex] !== pattern[patternIndex]) {
      // We are not parsing params and pattern and url are different
      // means it's not a match
      return;
    }

    urlIndex++;
    patternIndex++;
  }
}