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// src/utils.ts
var HOLE = -1;
var NAN = -2;
var NEGATIVE_INFINITY = -3;
var NEGATIVE_ZERO = -4;
var NULL = -5;
var POSITIVE_INFINITY = -6;
var UNDEFINED = -7;
var TYPE_BIGINT = "B";
var TYPE_DATE = "D";
var TYPE_ERROR = "E";
var TYPE_MAP = "M";
var TYPE_NULL_OBJECT = "N";
var TYPE_PROMISE = "P";
var TYPE_REGEXP = "R";
var TYPE_SET = "S";
var TYPE_SYMBOL = "Y";
var TYPE_URL = "U";
var TYPE_PREVIOUS_RESOLVED = "Z";
var Deferred = class {
  promise;
  resolve;
  reject;
  constructor() {
    this.promise = new Promise((resolve, reject) => {
      this.resolve = resolve;
      this.reject = reject;
    });
  }
};
function createLineSplittingTransform() {
  const decoder = new TextDecoder();
  let leftover = "";
  return new TransformStream({
    transform(chunk, controller) {
      const str = decoder.decode(chunk, { stream: true });
      const parts = (leftover + str).split("\n");
      leftover = parts.pop() || "";
      for (const part of parts) {
        controller.enqueue(part);
      }
    },
    flush(controller) {
      if (leftover) {
        controller.enqueue(leftover);
      }
    }
  });
}

// src/flatten.ts
function flatten(input) {
  const { indices } = this;
  const existing = indices.get(input);
  if (existing)
    return [existing];
  if (input === void 0)
    return UNDEFINED;
  if (input === null)
    return NULL;
  if (Number.isNaN(input))
    return NAN;
  if (input === Number.POSITIVE_INFINITY)
    return POSITIVE_INFINITY;
  if (input === Number.NEGATIVE_INFINITY)
    return NEGATIVE_INFINITY;
  if (input === 0 && 1 / input < 0)
    return NEGATIVE_ZERO;
  const index = this.index++;
  indices.set(input, index);
  stringify.call(this, input, index);
  return index;
}
function stringify(input, index) {
  const { deferred, plugins, postPlugins } = this;
  const str = this.stringified;
  const stack = [[input, index]];
  while (stack.length > 0) {
    const [input2, index2] = stack.pop();
    const partsForObj = (obj) => Object.keys(obj).map((k) => `"_${flatten.call(this, k)}":${flatten.call(this, obj[k])}`).join(",");
    let error = null;
    switch (typeof input2) {
      case "boolean":
      case "number":
      case "string":
        str[index2] = JSON.stringify(input2);
        break;
      case "bigint":
        str[index2] = `["${TYPE_BIGINT}","${input2}"]`;
        break;
      case "symbol": {
        const keyFor = Symbol.keyFor(input2);
        if (!keyFor) {
          error = new Error(
            "Cannot encode symbol unless created with Symbol.for()"
          );
        } else {
          str[index2] = `["${TYPE_SYMBOL}",${JSON.stringify(keyFor)}]`;
        }
        break;
      }
      case "object": {
        if (!input2) {
          str[index2] = `${NULL}`;
          break;
        }
        const isArray = Array.isArray(input2);
        let pluginHandled = false;
        if (!isArray && plugins) {
          for (const plugin of plugins) {
            const pluginResult = plugin(input2);
            if (Array.isArray(pluginResult)) {
              pluginHandled = true;
              const [pluginIdentifier, ...rest] = pluginResult;
              str[index2] = `[${JSON.stringify(pluginIdentifier)}`;
              if (rest.length > 0) {
                str[index2] += `,${rest.map((v) => flatten.call(this, v)).join(",")}`;
              }
              str[index2] += "]";
              break;
            }
          }
        }
        if (!pluginHandled) {
          let result = isArray ? "[" : "{";
          if (isArray) {
            for (let i = 0; i < input2.length; i++)
              result += (i ? "," : "") + (i in input2 ? flatten.call(this, input2[i]) : HOLE);
            str[index2] = `${result}]`;
          } else if (input2 instanceof Date) {
            str[index2] = `["${TYPE_DATE}",${input2.getTime()}]`;
          } else if (input2 instanceof URL) {
            str[index2] = `["${TYPE_URL}",${JSON.stringify(input2.href)}]`;
          } else if (input2 instanceof RegExp) {
            str[index2] = `["${TYPE_REGEXP}",${JSON.stringify(
              input2.source
            )},${JSON.stringify(input2.flags)}]`;
          } else if (input2 instanceof Set) {
            if (input2.size > 0) {
              str[index2] = `["${TYPE_SET}",${[...input2].map((val) => flatten.call(this, val)).join(",")}]`;
            } else {
              str[index2] = `["${TYPE_SET}"]`;
            }
          } else if (input2 instanceof Map) {
            if (input2.size > 0) {
              str[index2] = `["${TYPE_MAP}",${[...input2].flatMap(([k, v]) => [
                flatten.call(this, k),
                flatten.call(this, v)
              ]).join(",")}]`;
            } else {
              str[index2] = `["${TYPE_MAP}"]`;
            }
          } else if (input2 instanceof Promise) {
            str[index2] = `["${TYPE_PROMISE}",${index2}]`;
            deferred[index2] = input2;
          } else if (input2 instanceof Error) {
            str[index2] = `["${TYPE_ERROR}",${JSON.stringify(input2.message)}`;
            if (input2.name !== "Error") {
              str[index2] += `,${JSON.stringify(input2.name)}`;
            }
            str[index2] += "]";
          } else if (Object.getPrototypeOf(input2) === null) {
            str[index2] = `["${TYPE_NULL_OBJECT}",{${partsForObj(input2)}}]`;
          } else if (isPlainObject(input2)) {
            str[index2] = `{${partsForObj(input2)}}`;
          } else {
            error = new Error("Cannot encode object with prototype");
          }
        }
        break;
      }
      default: {
        const isArray = Array.isArray(input2);
        let pluginHandled = false;
        if (!isArray && plugins) {
          for (const plugin of plugins) {
            const pluginResult = plugin(input2);
            if (Array.isArray(pluginResult)) {
              pluginHandled = true;
              const [pluginIdentifier, ...rest] = pluginResult;
              str[index2] = `[${JSON.stringify(pluginIdentifier)}`;
              if (rest.length > 0) {
                str[index2] += `,${rest.map((v) => flatten.call(this, v)).join(",")}`;
              }
              str[index2] += "]";
              break;
            }
          }
        }
        if (!pluginHandled) {
          error = new Error("Cannot encode function or unexpected type");
        }
      }
    }
    if (error) {
      let pluginHandled = false;
      if (postPlugins) {
        for (const plugin of postPlugins) {
          const pluginResult = plugin(input2);
          if (Array.isArray(pluginResult)) {
            pluginHandled = true;
            const [pluginIdentifier, ...rest] = pluginResult;
            str[index2] = `[${JSON.stringify(pluginIdentifier)}`;
            if (rest.length > 0) {
              str[index2] += `,${rest.map((v) => flatten.call(this, v)).join(",")}`;
            }
            str[index2] += "]";
            break;
          }
        }
      }
      if (!pluginHandled) {
        throw error;
      }
    }
  }
}
var objectProtoNames = Object.getOwnPropertyNames(Object.prototype).sort().join("\0");
function isPlainObject(thing) {
  const proto = Object.getPrototypeOf(thing);
  return proto === Object.prototype || proto === null || Object.getOwnPropertyNames(proto).sort().join("\0") === objectProtoNames;
}

// src/unflatten.ts
var globalObj = typeof window !== "undefined" ? window : typeof globalThis !== "undefined" ? globalThis : void 0;
function unflatten(parsed) {
  const { hydrated, values } = this;
  if (typeof parsed === "number")
    return hydrate.call(this, parsed);
  if (!Array.isArray(parsed) || !parsed.length)
    throw new SyntaxError();
  const startIndex = values.length;
  for (const value of parsed) {
    values.push(value);
  }
  hydrated.length = values.length;
  return hydrate.call(this, startIndex);
}
function hydrate(index) {
  const { hydrated, values, deferred, plugins } = this;
  let result;
  const stack = [
    [
      index,
      (v) => {
        result = v;
      }
    ]
  ];
  let postRun = [];
  while (stack.length > 0) {
    const [index2, set] = stack.pop();
    switch (index2) {
      case UNDEFINED:
        set(void 0);
        continue;
      case NULL:
        set(null);
        continue;
      case NAN:
        set(NaN);
        continue;
      case POSITIVE_INFINITY:
        set(Infinity);
        continue;
      case NEGATIVE_INFINITY:
        set(-Infinity);
        continue;
      case NEGATIVE_ZERO:
        set(-0);
        continue;
    }
    if (hydrated[index2]) {
      set(hydrated[index2]);
      continue;
    }
    const value = values[index2];
    if (!value || typeof value !== "object") {
      hydrated[index2] = value;
      set(value);
      continue;
    }
    if (Array.isArray(value)) {
      if (typeof value[0] === "string") {
        const [type, b, c] = value;
        switch (type) {
          case TYPE_DATE:
            set(hydrated[index2] = new Date(b));
            continue;
          case TYPE_URL:
            set(hydrated[index2] = new URL(b));
            continue;
          case TYPE_BIGINT:
            set(hydrated[index2] = BigInt(b));
            continue;
          case TYPE_REGEXP:
            set(hydrated[index2] = new RegExp(b, c));
            continue;
          case TYPE_SYMBOL:
            set(hydrated[index2] = Symbol.for(b));
            continue;
          case TYPE_SET:
            const newSet = /* @__PURE__ */ new Set();
            hydrated[index2] = newSet;
            for (let i = 1; i < value.length; i++)
              stack.push([
                value[i],
                (v) => {
                  newSet.add(v);
                }
              ]);
            set(newSet);
            continue;
          case TYPE_MAP:
            const map = /* @__PURE__ */ new Map();
            hydrated[index2] = map;
            for (let i = 1; i < value.length; i += 2) {
              const r = [];
              stack.push([
                value[i + 1],
                (v) => {
                  r[1] = v;
                }
              ]);
              stack.push([
                value[i],
                (k) => {
                  r[0] = k;
                }
              ]);
              postRun.push(() => {
                map.set(r[0], r[1]);
              });
            }
            set(map);
            continue;
          case TYPE_NULL_OBJECT:
            const obj = /* @__PURE__ */ Object.create(null);
            hydrated[index2] = obj;
            for (const key of Object.keys(b).reverse()) {
              const r = [];
              stack.push([
                b[key],
                (v) => {
                  r[1] = v;
                }
              ]);
              stack.push([
                Number(key.slice(1)),
                (k) => {
                  r[0] = k;
                }
              ]);
              postRun.push(() => {
                obj[r[0]] = r[1];
              });
            }
            set(obj);
            continue;
          case TYPE_PROMISE:
            if (hydrated[b]) {
              set(hydrated[index2] = hydrated[b]);
            } else {
              const d = new Deferred();
              deferred[b] = d;
              set(hydrated[index2] = d.promise);
            }
            continue;
          case TYPE_ERROR:
            const [, message, errorType] = value;
            let error = errorType && globalObj && globalObj[errorType] ? new globalObj[errorType](message) : new Error(message);
            hydrated[index2] = error;
            set(error);
            continue;
          case TYPE_PREVIOUS_RESOLVED:
            set(hydrated[index2] = hydrated[b]);
            continue;
          default:
            if (Array.isArray(plugins)) {
              const r = [];
              const vals = value.slice(1);
              for (let i = 0; i < vals.length; i++) {
                const v = vals[i];
                stack.push([
                  v,
                  (v2) => {
                    r[i] = v2;
                  }
                ]);
              }
              postRun.push(() => {
                for (const plugin of plugins) {
                  const result2 = plugin(value[0], ...r);
                  if (result2) {
                    set(hydrated[index2] = result2.value);
                    return;
                  }
                }
                throw new SyntaxError();
              });
              continue;
            }
            throw new SyntaxError();
        }
      } else {
        const array = [];
        hydrated[index2] = array;
        for (let i = 0; i < value.length; i++) {
          const n = value[i];
          if (n !== HOLE) {
            stack.push([
              n,
              (v) => {
                array[i] = v;
              }
            ]);
          }
        }
        set(array);
        continue;
      }
    } else {
      const object = {};
      hydrated[index2] = object;
      for (const key of Object.keys(value).reverse()) {
        const r = [];
        stack.push([
          value[key],
          (v) => {
            r[1] = v;
          }
        ]);
        stack.push([
          Number(key.slice(1)),
          (k) => {
            r[0] = k;
          }
        ]);
        postRun.push(() => {
          object[r[0]] = r[1];
        });
      }
      set(object);
      continue;
    }
  }
  while (postRun.length > 0) {
    postRun.pop()();
  }
  return result;
}

// src/turbo-stream.ts
async function decode(readable, options) {
  const { plugins } = options ?? {};
  const done = new Deferred();
  const reader = readable.pipeThrough(createLineSplittingTransform()).getReader();
  const decoder = {
    values: [],
    hydrated: [],
    deferred: {},
    plugins
  };
  const decoded = await decodeInitial.call(decoder, reader);
  let donePromise = done.promise;
  if (decoded.done) {
    done.resolve();
  } else {
    donePromise = decodeDeferred.call(decoder, reader).then(done.resolve).catch((reason) => {
      for (const deferred of Object.values(decoder.deferred)) {
        deferred.reject(reason);
      }
      done.reject(reason);
    });
  }
  return {
    done: donePromise.then(() => reader.closed),
    value: decoded.value
  };
}
async function decodeInitial(reader) {
  const read = await reader.read();
  if (!read.value) {
    throw new SyntaxError();
  }
  let line;
  try {
    line = JSON.parse(read.value);
  } catch (reason) {
    throw new SyntaxError();
  }
  return {
    done: read.done,
    value: unflatten.call(this, line)
  };
}
async function decodeDeferred(reader) {
  let read = await reader.read();
  while (!read.done) {
    if (!read.value)
      continue;
    const line = read.value;
    switch (line[0]) {
      case TYPE_PROMISE: {
        const colonIndex = line.indexOf(":");
        const deferredId = Number(line.slice(1, colonIndex));
        const deferred = this.deferred[deferredId];
        if (!deferred) {
          throw new Error(`Deferred ID ${deferredId} not found in stream`);
        }
        const lineData = line.slice(colonIndex + 1);
        let jsonLine;
        try {
          jsonLine = JSON.parse(lineData);
        } catch (reason) {
          throw new SyntaxError();
        }
        const value = unflatten.call(this, jsonLine);
        deferred.resolve(value);
        break;
      }
      case TYPE_ERROR: {
        const colonIndex = line.indexOf(":");
        const deferredId = Number(line.slice(1, colonIndex));
        const deferred = this.deferred[deferredId];
        if (!deferred) {
          throw new Error(`Deferred ID ${deferredId} not found in stream`);
        }
        const lineData = line.slice(colonIndex + 1);
        let jsonLine;
        try {
          jsonLine = JSON.parse(lineData);
        } catch (reason) {
          throw new SyntaxError();
        }
        const value = unflatten.call(this, jsonLine);
        deferred.reject(value);
        break;
      }
      default:
        throw new SyntaxError();
    }
    read = await reader.read();
  }
}
function encode(input, options) {
  const { plugins, postPlugins, signal } = options ?? {};
  const encoder = {
    deferred: {},
    index: 0,
    indices: /* @__PURE__ */ new Map(),
    stringified: [],
    plugins,
    postPlugins,
    signal
  };
  const textEncoder = new TextEncoder();
  let lastSentIndex = 0;
  const readable = new ReadableStream({
    async start(controller) {
      const id = flatten.call(encoder, input);
      if (Array.isArray(id)) {
        throw new Error("This should never happen");
      }
      if (id < 0) {
        controller.enqueue(textEncoder.encode(`${id}
`));
      } else {
        controller.enqueue(
          textEncoder.encode(`[${encoder.stringified.join(",")}]
`)
        );
        lastSentIndex = encoder.stringified.length - 1;
      }
      const seenPromises = /* @__PURE__ */ new WeakSet();
      while (Object.keys(encoder.deferred).length > 0) {
        for (const [deferredId, deferred] of Object.entries(encoder.deferred)) {
          if (seenPromises.has(deferred))
            continue;
          seenPromises.add(
            encoder.deferred[Number(deferredId)] = raceSignal(
              deferred,
              encoder.signal
            ).then(
              (resolved) => {
                const id2 = flatten.call(encoder, resolved);
                if (Array.isArray(id2)) {
                  controller.enqueue(
                    textEncoder.encode(
                      `${TYPE_PROMISE}${deferredId}:[["${TYPE_PREVIOUS_RESOLVED}",${id2[0]}]]
`
                    )
                  );
                  encoder.index++;
                  lastSentIndex++;
                } else if (id2 < 0) {
                  controller.enqueue(
                    textEncoder.encode(`${TYPE_PROMISE}${deferredId}:${id2}
`)
                  );
                } else {
                  const values = encoder.stringified.slice(lastSentIndex + 1).join(",");
                  controller.enqueue(
                    textEncoder.encode(
                      `${TYPE_PROMISE}${deferredId}:[${values}]
`
                    )
                  );
                  lastSentIndex = encoder.stringified.length - 1;
                }
              },
              (reason) => {
                if (!reason || typeof reason !== "object" || !(reason instanceof Error)) {
                  reason = new Error("An unknown error occurred");
                }
                const id2 = flatten.call(encoder, reason);
                if (Array.isArray(id2)) {
                  controller.enqueue(
                    textEncoder.encode(
                      `${TYPE_ERROR}${deferredId}:[["${TYPE_PREVIOUS_RESOLVED}",${id2[0]}]]
`
                    )
                  );
                  encoder.index++;
                  lastSentIndex++;
                } else if (id2 < 0) {
                  controller.enqueue(
                    textEncoder.encode(`${TYPE_ERROR}${deferredId}:${id2}
`)
                  );
                } else {
                  const values = encoder.stringified.slice(lastSentIndex + 1).join(",");
                  controller.enqueue(
                    textEncoder.encode(
                      `${TYPE_ERROR}${deferredId}:[${values}]
`
                    )
                  );
                  lastSentIndex = encoder.stringified.length - 1;
                }
              }
            ).finally(() => {
              delete encoder.deferred[Number(deferredId)];
            })
          );
        }
        await Promise.race(Object.values(encoder.deferred));
      }
      await Promise.all(Object.values(encoder.deferred));
      controller.close();
    }
  });
  return readable;
}
function raceSignal(promise, signal) {
  if (!signal)
    return promise;
  if (signal.aborted)
    return Promise.reject(signal.reason || new Error("Signal was aborted."));
  const abort = new Promise((resolve, reject) => {
    signal.addEventListener("abort", (event) => {
      reject(signal.reason || new Error("Signal was aborted."));
    });
    promise.then(resolve).catch(reject);
  });
  abort.catch(() => {
  });
  return Promise.race([abort, promise]);
}
export {
  decode,
  encode
};