hono/dist/router/reg-exp-router/node.js

Web framework built on Web Standards

// src/router/reg-exp-router/node.ts
var LABEL_REG_EXP_STR = "[^/]+";
var ONLY_WILDCARD_REG_EXP_STR = ".*";
var TAIL_WILDCARD_REG_EXP_STR = "(?:|/.*)";
var PATH_ERROR = Symbol();
var regExpMetaChars = new Set(".\\+*[^]$()");
function compareKey(a, b) {
  if (a.length === 1) {
    return b.length === 1 ? a < b ? -1 : 1 : -1;
  }
  if (b.length === 1) {
    return 1;
  }
  if (a === ONLY_WILDCARD_REG_EXP_STR || a === TAIL_WILDCARD_REG_EXP_STR) {
    return 1;
  } else if (b === ONLY_WILDCARD_REG_EXP_STR || b === TAIL_WILDCARD_REG_EXP_STR) {
    return -1;
  }
  if (a === LABEL_REG_EXP_STR) {
    return 1;
  } else if (b === LABEL_REG_EXP_STR) {
    return -1;
  }
  return a.length === b.length ? a < b ? -1 : 1 : b.length - a.length;
}
var Node = class {
  index;
  varIndex;
  children = /* @__PURE__ */ Object.create(null);
  insert(tokens, index, paramMap, context, pathErrorCheckOnly) {
    if (tokens.length === 0) {
      if (this.index !== void 0) {
        throw PATH_ERROR;
      }
      if (pathErrorCheckOnly) {
        return;
      }
      this.index = index;
      return;
    }
    const [token, ...restTokens] = tokens;
    const pattern = token === "*" ? restTokens.length === 0 ? ["", "", ONLY_WILDCARD_REG_EXP_STR] : ["", "", LABEL_REG_EXP_STR] : token === "/*" ? ["", "", TAIL_WILDCARD_REG_EXP_STR] : token.match(/^\:([^\{\}]+)(?:\{(.+)\})?$/);
    let node;
    if (pattern) {
      const name = pattern[1];
      let regexpStr = pattern[2] || LABEL_REG_EXP_STR;
      if (name && pattern[2]) {
        regexpStr = regexpStr.replace(/^\((?!\?:)(?=[^)]+\)$)/, "(?:");
        if (/\((?!\?:)/.test(regexpStr)) {
          throw PATH_ERROR;
        }
      }
      node = this.children[regexpStr];
      if (!node) {
        if (Object.keys(this.children).some(
          (k) => k !== ONLY_WILDCARD_REG_EXP_STR && k !== TAIL_WILDCARD_REG_EXP_STR
        )) {
          throw PATH_ERROR;
        }
        if (pathErrorCheckOnly) {
          return;
        }
        node = this.children[regexpStr] = new Node();
        if (name !== "") {
          node.varIndex = context.varIndex++;
        }
      }
      if (!pathErrorCheckOnly && name !== "") {
        paramMap.push([name, node.varIndex]);
      }
    } else {
      node = this.children[token];
      if (!node) {
        if (Object.keys(this.children).some(
          (k) => k.length > 1 && k !== ONLY_WILDCARD_REG_EXP_STR && k !== TAIL_WILDCARD_REG_EXP_STR
        )) {
          throw PATH_ERROR;
        }
        if (pathErrorCheckOnly) {
          return;
        }
        node = this.children[token] = new Node();
      }
    }
    node.insert(restTokens, index, paramMap, context, pathErrorCheckOnly);
  }
  buildRegExpStr() {
    const childKeys = Object.keys(this.children).sort(compareKey);
    const strList = childKeys.map((k) => {
      const c = this.children[k];
      return (typeof c.varIndex === "number" ? `(${k})@${c.varIndex}` : regExpMetaChars.has(k) ? `\\${k}` : k) + c.buildRegExpStr();
    });
    if (typeof this.index === "number") {
      strList.unshift(`#${this.index}`);
    }
    if (strList.length === 0) {
      return "";
    }
    if (strList.length === 1) {
      return strList[0];
    }
    return "(?:" + strList.join("|") + ")";
  }
};
export {
  Node,
  PATH_ERROR
};