react-tesseract
Version:
A lightweight React hook for seamless integration of Tesseract.js OCR capabilities.
1,618 lines (1,437 loc) • 66.6 kB
JavaScript
import { useState, useCallback } from 'react';
function _arrayLikeToArray(r, a) {
(null == a || a > r.length) && (a = r.length);
for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e];
return n;
}
function _arrayWithHoles(r) {
if (Array.isArray(r)) return r;
}
function asyncGeneratorStep(n, t, e, r, o, a, c) {
try {
var i = n[a](c),
u = i.value;
} catch (n) {
return void e(n);
}
i.done ? t(u) : Promise.resolve(u).then(r, o);
}
function _asyncToGenerator(n) {
return function () {
var t = this,
e = arguments;
return new Promise(function (r, o) {
var a = n.apply(t, e);
function _next(n) {
asyncGeneratorStep(a, r, o, _next, _throw, "next", n);
}
function _throw(n) {
asyncGeneratorStep(a, r, o, _next, _throw, "throw", n);
}
_next(void 0);
});
};
}
function _iterableToArrayLimit(r, l) {
var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"];
if (null != t) {
var e,
n,
i,
u,
a = [],
f = true,
o = false;
try {
if (i = (t = t.call(r)).next, 0 === l) ; else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0);
} catch (r) {
o = true, n = r;
} finally {
try {
if (!f && null != t.return && (u = t.return(), Object(u) !== u)) return;
} finally {
if (o) throw n;
}
}
return a;
}
}
function _nonIterableRest() {
throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}
function _objectWithoutProperties(e, t) {
if (null == e) return {};
var o,
r,
i = _objectWithoutPropertiesLoose(e, t);
if (Object.getOwnPropertySymbols) {
var n = Object.getOwnPropertySymbols(e);
for (r = 0; r < n.length; r++) o = n[r], -1 === t.indexOf(o) && {}.propertyIsEnumerable.call(e, o) && (i[o] = e[o]);
}
return i;
}
function _objectWithoutPropertiesLoose(r, e) {
if (null == r) return {};
var t = {};
for (var n in r) if ({}.hasOwnProperty.call(r, n)) {
if (-1 !== e.indexOf(n)) continue;
t[n] = r[n];
}
return t;
}
function _regeneratorRuntime() {
_regeneratorRuntime = function () {
return e;
};
var t,
e = {},
r = Object.prototype,
n = r.hasOwnProperty,
o = Object.defineProperty || function (t, e, r) {
t[e] = r.value;
},
i = "function" == typeof Symbol ? Symbol : {},
a = i.iterator || "@@iterator",
c = i.asyncIterator || "@@asyncIterator",
u = i.toStringTag || "@@toStringTag";
function define(t, e, r) {
return Object.defineProperty(t, e, {
value: r,
enumerable: true,
configurable: true,
writable: true
}), t[e];
}
try {
define({}, "");
} catch (t) {
define = function (t, e, r) {
return t[e] = r;
};
}
function wrap(t, e, r, n) {
var i = e && e.prototype instanceof Generator ? e : Generator,
a = Object.create(i.prototype),
c = new Context(n || []);
return o(a, "_invoke", {
value: makeInvokeMethod(t, r, c)
}), a;
}
function tryCatch(t, e, r) {
try {
return {
type: "normal",
arg: t.call(e, r)
};
} catch (t) {
return {
type: "throw",
arg: t
};
}
}
e.wrap = wrap;
var h = "suspendedStart",
l = "suspendedYield",
f = "executing",
s = "completed",
y = {};
function Generator() {}
function GeneratorFunction() {}
function GeneratorFunctionPrototype() {}
var p = {};
define(p, a, function () {
return this;
});
var d = Object.getPrototypeOf,
v = d && d(d(values([])));
v && v !== r && n.call(v, a) && (p = v);
var g = GeneratorFunctionPrototype.prototype = Generator.prototype = Object.create(p);
function defineIteratorMethods(t) {
["next", "throw", "return"].forEach(function (e) {
define(t, e, function (t) {
return this._invoke(e, t);
});
});
}
function AsyncIterator(t, e) {
function invoke(r, o, i, a) {
var c = tryCatch(t[r], t, o);
if ("throw" !== c.type) {
var u = c.arg,
h = u.value;
return h && "object" == typeof h && n.call(h, "__await") ? e.resolve(h.__await).then(function (t) {
invoke("next", t, i, a);
}, function (t) {
invoke("throw", t, i, a);
}) : e.resolve(h).then(function (t) {
u.value = t, i(u);
}, function (t) {
return invoke("throw", t, i, a);
});
}
a(c.arg);
}
var r;
o(this, "_invoke", {
value: function (t, n) {
function callInvokeWithMethodAndArg() {
return new e(function (e, r) {
invoke(t, n, e, r);
});
}
return r = r ? r.then(callInvokeWithMethodAndArg, callInvokeWithMethodAndArg) : callInvokeWithMethodAndArg();
}
});
}
function makeInvokeMethod(e, r, n) {
var o = h;
return function (i, a) {
if (o === f) throw Error("Generator is already running");
if (o === s) {
if ("throw" === i) throw a;
return {
value: t,
done: true
};
}
for (n.method = i, n.arg = a;;) {
var c = n.delegate;
if (c) {
var u = maybeInvokeDelegate(c, n);
if (u) {
if (u === y) continue;
return u;
}
}
if ("next" === n.method) n.sent = n._sent = n.arg;else if ("throw" === n.method) {
if (o === h) throw o = s, n.arg;
n.dispatchException(n.arg);
} else "return" === n.method && n.abrupt("return", n.arg);
o = f;
var p = tryCatch(e, r, n);
if ("normal" === p.type) {
if (o = n.done ? s : l, p.arg === y) continue;
return {
value: p.arg,
done: n.done
};
}
"throw" === p.type && (o = s, n.method = "throw", n.arg = p.arg);
}
};
}
function maybeInvokeDelegate(e, r) {
var n = r.method,
o = e.iterator[n];
if (o === t) return r.delegate = null, "throw" === n && e.iterator.return && (r.method = "return", r.arg = t, maybeInvokeDelegate(e, r), "throw" === r.method) || "return" !== n && (r.method = "throw", r.arg = new TypeError("The iterator does not provide a '" + n + "' method")), y;
var i = tryCatch(o, e.iterator, r.arg);
if ("throw" === i.type) return r.method = "throw", r.arg = i.arg, r.delegate = null, y;
var a = i.arg;
return a ? a.done ? (r[e.resultName] = a.value, r.next = e.nextLoc, "return" !== r.method && (r.method = "next", r.arg = t), r.delegate = null, y) : a : (r.method = "throw", r.arg = new TypeError("iterator result is not an object"), r.delegate = null, y);
}
function pushTryEntry(t) {
var e = {
tryLoc: t[0]
};
1 in t && (e.catchLoc = t[1]), 2 in t && (e.finallyLoc = t[2], e.afterLoc = t[3]), this.tryEntries.push(e);
}
function resetTryEntry(t) {
var e = t.completion || {};
e.type = "normal", delete e.arg, t.completion = e;
}
function Context(t) {
this.tryEntries = [{
tryLoc: "root"
}], t.forEach(pushTryEntry, this), this.reset(true);
}
function values(e) {
if (e || "" === e) {
var r = e[a];
if (r) return r.call(e);
if ("function" == typeof e.next) return e;
if (!isNaN(e.length)) {
var o = -1,
i = function next() {
for (; ++o < e.length;) if (n.call(e, o)) return next.value = e[o], next.done = false, next;
return next.value = t, next.done = true, next;
};
return i.next = i;
}
}
throw new TypeError(typeof e + " is not iterable");
}
return GeneratorFunction.prototype = GeneratorFunctionPrototype, o(g, "constructor", {
value: GeneratorFunctionPrototype,
configurable: true
}), o(GeneratorFunctionPrototype, "constructor", {
value: GeneratorFunction,
configurable: true
}), GeneratorFunction.displayName = define(GeneratorFunctionPrototype, u, "GeneratorFunction"), e.isGeneratorFunction = function (t) {
var e = "function" == typeof t && t.constructor;
return !!e && (e === GeneratorFunction || "GeneratorFunction" === (e.displayName || e.name));
}, e.mark = function (t) {
return Object.setPrototypeOf ? Object.setPrototypeOf(t, GeneratorFunctionPrototype) : (t.__proto__ = GeneratorFunctionPrototype, define(t, u, "GeneratorFunction")), t.prototype = Object.create(g), t;
}, e.awrap = function (t) {
return {
__await: t
};
}, defineIteratorMethods(AsyncIterator.prototype), define(AsyncIterator.prototype, c, function () {
return this;
}), e.AsyncIterator = AsyncIterator, e.async = function (t, r, n, o, i) {
void 0 === i && (i = Promise);
var a = new AsyncIterator(wrap(t, r, n, o), i);
return e.isGeneratorFunction(r) ? a : a.next().then(function (t) {
return t.done ? t.value : a.next();
});
}, defineIteratorMethods(g), define(g, u, "Generator"), define(g, a, function () {
return this;
}), define(g, "toString", function () {
return "[object Generator]";
}), e.keys = function (t) {
var e = Object(t),
r = [];
for (var n in e) r.push(n);
return r.reverse(), function next() {
for (; r.length;) {
var t = r.pop();
if (t in e) return next.value = t, next.done = false, next;
}
return next.done = true, next;
};
}, e.values = values, Context.prototype = {
constructor: Context,
reset: function (e) {
if (this.prev = 0, this.next = 0, this.sent = this._sent = t, this.done = false, this.delegate = null, this.method = "next", this.arg = t, this.tryEntries.forEach(resetTryEntry), !e) for (var r in this) "t" === r.charAt(0) && n.call(this, r) && !isNaN(+r.slice(1)) && (this[r] = t);
},
stop: function () {
this.done = true;
var t = this.tryEntries[0].completion;
if ("throw" === t.type) throw t.arg;
return this.rval;
},
dispatchException: function (e) {
if (this.done) throw e;
var r = this;
function handle(n, o) {
return a.type = "throw", a.arg = e, r.next = n, o && (r.method = "next", r.arg = t), !!o;
}
for (var o = this.tryEntries.length - 1; o >= 0; --o) {
var i = this.tryEntries[o],
a = i.completion;
if ("root" === i.tryLoc) return handle("end");
if (i.tryLoc <= this.prev) {
var c = n.call(i, "catchLoc"),
u = n.call(i, "finallyLoc");
if (c && u) {
if (this.prev < i.catchLoc) return handle(i.catchLoc, true);
if (this.prev < i.finallyLoc) return handle(i.finallyLoc);
} else if (c) {
if (this.prev < i.catchLoc) return handle(i.catchLoc, true);
} else {
if (!u) throw Error("try statement without catch or finally");
if (this.prev < i.finallyLoc) return handle(i.finallyLoc);
}
}
}
},
abrupt: function (t, e) {
for (var r = this.tryEntries.length - 1; r >= 0; --r) {
var o = this.tryEntries[r];
if (o.tryLoc <= this.prev && n.call(o, "finallyLoc") && this.prev < o.finallyLoc) {
var i = o;
break;
}
}
i && ("break" === t || "continue" === t) && i.tryLoc <= e && e <= i.finallyLoc && (i = null);
var a = i ? i.completion : {};
return a.type = t, a.arg = e, i ? (this.method = "next", this.next = i.finallyLoc, y) : this.complete(a);
},
complete: function (t, e) {
if ("throw" === t.type) throw t.arg;
return "break" === t.type || "continue" === t.type ? this.next = t.arg : "return" === t.type ? (this.rval = this.arg = t.arg, this.method = "return", this.next = "end") : "normal" === t.type && e && (this.next = e), y;
},
finish: function (t) {
for (var e = this.tryEntries.length - 1; e >= 0; --e) {
var r = this.tryEntries[e];
if (r.finallyLoc === t) return this.complete(r.completion, r.afterLoc), resetTryEntry(r), y;
}
},
catch: function (t) {
for (var e = this.tryEntries.length - 1; e >= 0; --e) {
var r = this.tryEntries[e];
if (r.tryLoc === t) {
var n = r.completion;
if ("throw" === n.type) {
var o = n.arg;
resetTryEntry(r);
}
return o;
}
}
throw Error("illegal catch attempt");
},
delegateYield: function (e, r, n) {
return this.delegate = {
iterator: values(e),
resultName: r,
nextLoc: n
}, "next" === this.method && (this.arg = t), y;
}
}, e;
}
function _slicedToArray(r, e) {
return _arrayWithHoles(r) || _iterableToArrayLimit(r, e) || _unsupportedIterableToArray(r, e) || _nonIterableRest();
}
function _unsupportedIterableToArray(r, a) {
if (r) {
if ("string" == typeof r) return _arrayLikeToArray(r, a);
var t = {}.toString.call(r).slice(8, -1);
return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0;
}
}
var runtime = {exports: {}};
/**
* Copyright (c) 2014-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
(function (module) {
var runtime = (function (exports) {
var Op = Object.prototype;
var hasOwn = Op.hasOwnProperty;
var defineProperty = Object.defineProperty || function (obj, key, desc) { obj[key] = desc.value; };
var undefined$1; // More compressible than void 0.
var $Symbol = typeof Symbol === "function" ? Symbol : {};
var iteratorSymbol = $Symbol.iterator || "@@iterator";
var asyncIteratorSymbol = $Symbol.asyncIterator || "@@asyncIterator";
var toStringTagSymbol = $Symbol.toStringTag || "@@toStringTag";
function define(obj, key, value) {
Object.defineProperty(obj, key, {
value: value,
enumerable: true,
configurable: true,
writable: true
});
return obj[key];
}
try {
// IE 8 has a broken Object.defineProperty that only works on DOM objects.
define({}, "");
} catch (err) {
define = function(obj, key, value) {
return obj[key] = value;
};
}
function wrap(innerFn, outerFn, self, tryLocsList) {
// If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.
var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;
var generator = Object.create(protoGenerator.prototype);
var context = new Context(tryLocsList || []);
// The ._invoke method unifies the implementations of the .next,
// .throw, and .return methods.
defineProperty(generator, "_invoke", { value: makeInvokeMethod(innerFn, self, context) });
return generator;
}
exports.wrap = wrap;
// Try/catch helper to minimize deoptimizations. Returns a completion
// record like context.tryEntries[i].completion. This interface could
// have been (and was previously) designed to take a closure to be
// invoked without arguments, but in all the cases we care about we
// already have an existing method we want to call, so there's no need
// to create a new function object. We can even get away with assuming
// the method takes exactly one argument, since that happens to be true
// in every case, so we don't have to touch the arguments object. The
// only additional allocation required is the completion record, which
// has a stable shape and so hopefully should be cheap to allocate.
function tryCatch(fn, obj, arg) {
try {
return { type: "normal", arg: fn.call(obj, arg) };
} catch (err) {
return { type: "throw", arg: err };
}
}
var GenStateSuspendedStart = "suspendedStart";
var GenStateSuspendedYield = "suspendedYield";
var GenStateExecuting = "executing";
var GenStateCompleted = "completed";
// Returning this object from the innerFn has the same effect as
// breaking out of the dispatch switch statement.
var ContinueSentinel = {};
// Dummy constructor functions that we use as the .constructor and
// .constructor.prototype properties for functions that return Generator
// objects. For full spec compliance, you may wish to configure your
// minifier not to mangle the names of these two functions.
function Generator() {}
function GeneratorFunction() {}
function GeneratorFunctionPrototype() {}
// This is a polyfill for %IteratorPrototype% for environments that
// don't natively support it.
var IteratorPrototype = {};
define(IteratorPrototype, iteratorSymbol, function () {
return this;
});
var getProto = Object.getPrototypeOf;
var NativeIteratorPrototype = getProto && getProto(getProto(values([])));
if (NativeIteratorPrototype &&
NativeIteratorPrototype !== Op &&
hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {
// This environment has a native %IteratorPrototype%; use it instead
// of the polyfill.
IteratorPrototype = NativeIteratorPrototype;
}
var Gp = GeneratorFunctionPrototype.prototype =
Generator.prototype = Object.create(IteratorPrototype);
GeneratorFunction.prototype = GeneratorFunctionPrototype;
defineProperty(Gp, "constructor", { value: GeneratorFunctionPrototype, configurable: true });
defineProperty(
GeneratorFunctionPrototype,
"constructor",
{ value: GeneratorFunction, configurable: true }
);
GeneratorFunction.displayName = define(
GeneratorFunctionPrototype,
toStringTagSymbol,
"GeneratorFunction"
);
// Helper for defining the .next, .throw, and .return methods of the
// Iterator interface in terms of a single ._invoke method.
function defineIteratorMethods(prototype) {
["next", "throw", "return"].forEach(function(method) {
define(prototype, method, function(arg) {
return this._invoke(method, arg);
});
});
}
exports.isGeneratorFunction = function(genFun) {
var ctor = typeof genFun === "function" && genFun.constructor;
return ctor
? ctor === GeneratorFunction ||
// For the native GeneratorFunction constructor, the best we can
// do is to check its .name property.
(ctor.displayName || ctor.name) === "GeneratorFunction"
: false;
};
exports.mark = function(genFun) {
if (Object.setPrototypeOf) {
Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);
} else {
genFun.__proto__ = GeneratorFunctionPrototype;
define(genFun, toStringTagSymbol, "GeneratorFunction");
}
genFun.prototype = Object.create(Gp);
return genFun;
};
// Within the body of any async function, `await x` is transformed to
// `yield regeneratorRuntime.awrap(x)`, so that the runtime can test
// `hasOwn.call(value, "__await")` to determine if the yielded value is
// meant to be awaited.
exports.awrap = function(arg) {
return { __await: arg };
};
function AsyncIterator(generator, PromiseImpl) {
function invoke(method, arg, resolve, reject) {
var record = tryCatch(generator[method], generator, arg);
if (record.type === "throw") {
reject(record.arg);
} else {
var result = record.arg;
var value = result.value;
if (value &&
typeof value === "object" &&
hasOwn.call(value, "__await")) {
return PromiseImpl.resolve(value.__await).then(function(value) {
invoke("next", value, resolve, reject);
}, function(err) {
invoke("throw", err, resolve, reject);
});
}
return PromiseImpl.resolve(value).then(function(unwrapped) {
// When a yielded Promise is resolved, its final value becomes
// the .value of the Promise<{value,done}> result for the
// current iteration.
result.value = unwrapped;
resolve(result);
}, function(error) {
// If a rejected Promise was yielded, throw the rejection back
// into the async generator function so it can be handled there.
return invoke("throw", error, resolve, reject);
});
}
}
var previousPromise;
function enqueue(method, arg) {
function callInvokeWithMethodAndArg() {
return new PromiseImpl(function(resolve, reject) {
invoke(method, arg, resolve, reject);
});
}
return previousPromise =
// If enqueue has been called before, then we want to wait until
// all previous Promises have been resolved before calling invoke,
// so that results are always delivered in the correct order. If
// enqueue has not been called before, then it is important to
// call invoke immediately, without waiting on a callback to fire,
// so that the async generator function has the opportunity to do
// any necessary setup in a predictable way. This predictability
// is why the Promise constructor synchronously invokes its
// executor callback, and why async functions synchronously
// execute code before the first await. Since we implement simple
// async functions in terms of async generators, it is especially
// important to get this right, even though it requires care.
previousPromise ? previousPromise.then(
callInvokeWithMethodAndArg,
// Avoid propagating failures to Promises returned by later
// invocations of the iterator.
callInvokeWithMethodAndArg
) : callInvokeWithMethodAndArg();
}
// Define the unified helper method that is used to implement .next,
// .throw, and .return (see defineIteratorMethods).
defineProperty(this, "_invoke", { value: enqueue });
}
defineIteratorMethods(AsyncIterator.prototype);
define(AsyncIterator.prototype, asyncIteratorSymbol, function () {
return this;
});
exports.AsyncIterator = AsyncIterator;
// Note that simple async functions are implemented on top of
// AsyncIterator objects; they just return a Promise for the value of
// the final result produced by the iterator.
exports.async = function(innerFn, outerFn, self, tryLocsList, PromiseImpl) {
if (PromiseImpl === void 0) PromiseImpl = Promise;
var iter = new AsyncIterator(
wrap(innerFn, outerFn, self, tryLocsList),
PromiseImpl
);
return exports.isGeneratorFunction(outerFn)
? iter // If outerFn is a generator, return the full iterator.
: iter.next().then(function(result) {
return result.done ? result.value : iter.next();
});
};
function makeInvokeMethod(innerFn, self, context) {
var state = GenStateSuspendedStart;
return function invoke(method, arg) {
if (state === GenStateExecuting) {
throw new Error("Generator is already running");
}
if (state === GenStateCompleted) {
if (method === "throw") {
throw arg;
}
// Be forgiving, per 25.3.3.3.3 of the spec:
// https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume
return doneResult();
}
context.method = method;
context.arg = arg;
while (true) {
var delegate = context.delegate;
if (delegate) {
var delegateResult = maybeInvokeDelegate(delegate, context);
if (delegateResult) {
if (delegateResult === ContinueSentinel) continue;
return delegateResult;
}
}
if (context.method === "next") {
// Setting context._sent for legacy support of Babel's
// function.sent implementation.
context.sent = context._sent = context.arg;
} else if (context.method === "throw") {
if (state === GenStateSuspendedStart) {
state = GenStateCompleted;
throw context.arg;
}
context.dispatchException(context.arg);
} else if (context.method === "return") {
context.abrupt("return", context.arg);
}
state = GenStateExecuting;
var record = tryCatch(innerFn, self, context);
if (record.type === "normal") {
// If an exception is thrown from innerFn, we leave state ===
// GenStateExecuting and loop back for another invocation.
state = context.done
? GenStateCompleted
: GenStateSuspendedYield;
if (record.arg === ContinueSentinel) {
continue;
}
return {
value: record.arg,
done: context.done
};
} else if (record.type === "throw") {
state = GenStateCompleted;
// Dispatch the exception by looping back around to the
// context.dispatchException(context.arg) call above.
context.method = "throw";
context.arg = record.arg;
}
}
};
}
// Call delegate.iterator[context.method](context.arg) and handle the
// result, either by returning a { value, done } result from the
// delegate iterator, or by modifying context.method and context.arg,
// setting context.delegate to null, and returning the ContinueSentinel.
function maybeInvokeDelegate(delegate, context) {
var methodName = context.method;
var method = delegate.iterator[methodName];
if (method === undefined$1) {
// A .throw or .return when the delegate iterator has no .throw
// method, or a missing .next mehtod, always terminate the
// yield* loop.
context.delegate = null;
// Note: ["return"] must be used for ES3 parsing compatibility.
if (methodName === "throw" && delegate.iterator["return"]) {
// If the delegate iterator has a return method, give it a
// chance to clean up.
context.method = "return";
context.arg = undefined$1;
maybeInvokeDelegate(delegate, context);
if (context.method === "throw") {
// If maybeInvokeDelegate(context) changed context.method from
// "return" to "throw", let that override the TypeError below.
return ContinueSentinel;
}
}
if (methodName !== "return") {
context.method = "throw";
context.arg = new TypeError(
"The iterator does not provide a '" + methodName + "' method");
}
return ContinueSentinel;
}
var record = tryCatch(method, delegate.iterator, context.arg);
if (record.type === "throw") {
context.method = "throw";
context.arg = record.arg;
context.delegate = null;
return ContinueSentinel;
}
var info = record.arg;
if (! info) {
context.method = "throw";
context.arg = new TypeError("iterator result is not an object");
context.delegate = null;
return ContinueSentinel;
}
if (info.done) {
// Assign the result of the finished delegate to the temporary
// variable specified by delegate.resultName (see delegateYield).
context[delegate.resultName] = info.value;
// Resume execution at the desired location (see delegateYield).
context.next = delegate.nextLoc;
// If context.method was "throw" but the delegate handled the
// exception, let the outer generator proceed normally. If
// context.method was "next", forget context.arg since it has been
// "consumed" by the delegate iterator. If context.method was
// "return", allow the original .return call to continue in the
// outer generator.
if (context.method !== "return") {
context.method = "next";
context.arg = undefined$1;
}
} else {
// Re-yield the result returned by the delegate method.
return info;
}
// The delegate iterator is finished, so forget it and continue with
// the outer generator.
context.delegate = null;
return ContinueSentinel;
}
// Define Generator.prototype.{next,throw,return} in terms of the
// unified ._invoke helper method.
defineIteratorMethods(Gp);
define(Gp, toStringTagSymbol, "Generator");
// A Generator should always return itself as the iterator object when the
// @@iterator function is called on it. Some browsers' implementations of the
// iterator prototype chain incorrectly implement this, causing the Generator
// object to not be returned from this call. This ensures that doesn't happen.
// See https://github.com/facebook/regenerator/issues/274 for more details.
define(Gp, iteratorSymbol, function() {
return this;
});
define(Gp, "toString", function() {
return "[object Generator]";
});
function pushTryEntry(locs) {
var entry = { tryLoc: locs[0] };
if (1 in locs) {
entry.catchLoc = locs[1];
}
if (2 in locs) {
entry.finallyLoc = locs[2];
entry.afterLoc = locs[3];
}
this.tryEntries.push(entry);
}
function resetTryEntry(entry) {
var record = entry.completion || {};
record.type = "normal";
delete record.arg;
entry.completion = record;
}
function Context(tryLocsList) {
// The root entry object (effectively a try statement without a catch
// or a finally block) gives us a place to store values thrown from
// locations where there is no enclosing try statement.
this.tryEntries = [{ tryLoc: "root" }];
tryLocsList.forEach(pushTryEntry, this);
this.reset(true);
}
exports.keys = function(val) {
var object = Object(val);
var keys = [];
for (var key in object) {
keys.push(key);
}
keys.reverse();
// Rather than returning an object with a next method, we keep
// things simple and return the next function itself.
return function next() {
while (keys.length) {
var key = keys.pop();
if (key in object) {
next.value = key;
next.done = false;
return next;
}
}
// To avoid creating an additional object, we just hang the .value
// and .done properties off the next function object itself. This
// also ensures that the minifier will not anonymize the function.
next.done = true;
return next;
};
};
function values(iterable) {
if (iterable) {
var iteratorMethod = iterable[iteratorSymbol];
if (iteratorMethod) {
return iteratorMethod.call(iterable);
}
if (typeof iterable.next === "function") {
return iterable;
}
if (!isNaN(iterable.length)) {
var i = -1, next = function next() {
while (++i < iterable.length) {
if (hasOwn.call(iterable, i)) {
next.value = iterable[i];
next.done = false;
return next;
}
}
next.value = undefined$1;
next.done = true;
return next;
};
return next.next = next;
}
}
// Return an iterator with no values.
return { next: doneResult };
}
exports.values = values;
function doneResult() {
return { value: undefined$1, done: true };
}
Context.prototype = {
constructor: Context,
reset: function(skipTempReset) {
this.prev = 0;
this.next = 0;
// Resetting context._sent for legacy support of Babel's
// function.sent implementation.
this.sent = this._sent = undefined$1;
this.done = false;
this.delegate = null;
this.method = "next";
this.arg = undefined$1;
this.tryEntries.forEach(resetTryEntry);
if (!skipTempReset) {
for (var name in this) {
// Not sure about the optimal order of these conditions:
if (name.charAt(0) === "t" &&
hasOwn.call(this, name) &&
!isNaN(+name.slice(1))) {
this[name] = undefined$1;
}
}
}
},
stop: function() {
this.done = true;
var rootEntry = this.tryEntries[0];
var rootRecord = rootEntry.completion;
if (rootRecord.type === "throw") {
throw rootRecord.arg;
}
return this.rval;
},
dispatchException: function(exception) {
if (this.done) {
throw exception;
}
var context = this;
function handle(loc, caught) {
record.type = "throw";
record.arg = exception;
context.next = loc;
if (caught) {
// If the dispatched exception was caught by a catch block,
// then let that catch block handle the exception normally.
context.method = "next";
context.arg = undefined$1;
}
return !! caught;
}
for (var i = this.tryEntries.length - 1; i >= 0; --i) {
var entry = this.tryEntries[i];
var record = entry.completion;
if (entry.tryLoc === "root") {
// Exception thrown outside of any try block that could handle
// it, so set the completion value of the entire function to
// throw the exception.
return handle("end");
}
if (entry.tryLoc <= this.prev) {
var hasCatch = hasOwn.call(entry, "catchLoc");
var hasFinally = hasOwn.call(entry, "finallyLoc");
if (hasCatch && hasFinally) {
if (this.prev < entry.catchLoc) {
return handle(entry.catchLoc, true);
} else if (this.prev < entry.finallyLoc) {
return handle(entry.finallyLoc);
}
} else if (hasCatch) {
if (this.prev < entry.catchLoc) {
return handle(entry.catchLoc, true);
}
} else if (hasFinally) {
if (this.prev < entry.finallyLoc) {
return handle(entry.finallyLoc);
}
} else {
throw new Error("try statement without catch or finally");
}
}
}
},
abrupt: function(type, arg) {
for (var i = this.tryEntries.length - 1; i >= 0; --i) {
var entry = this.tryEntries[i];
if (entry.tryLoc <= this.prev &&
hasOwn.call(entry, "finallyLoc") &&
this.prev < entry.finallyLoc) {
var finallyEntry = entry;
break;
}
}
if (finallyEntry &&
(type === "break" ||
type === "continue") &&
finallyEntry.tryLoc <= arg &&
arg <= finallyEntry.finallyLoc) {
// Ignore the finally entry if control is not jumping to a
// location outside the try/catch block.
finallyEntry = null;
}
var record = finallyEntry ? finallyEntry.completion : {};
record.type = type;
record.arg = arg;
if (finallyEntry) {
this.method = "next";
this.next = finallyEntry.finallyLoc;
return ContinueSentinel;
}
return this.complete(record);
},
complete: function(record, afterLoc) {
if (record.type === "throw") {
throw record.arg;
}
if (record.type === "break" ||
record.type === "continue") {
this.next = record.arg;
} else if (record.type === "return") {
this.rval = this.arg = record.arg;
this.method = "return";
this.next = "end";
} else if (record.type === "normal" && afterLoc) {
this.next = afterLoc;
}
return ContinueSentinel;
},
finish: function(finallyLoc) {
for (var i = this.tryEntries.length - 1; i >= 0; --i) {
var entry = this.tryEntries[i];
if (entry.finallyLoc === finallyLoc) {
this.complete(entry.completion, entry.afterLoc);
resetTryEntry(entry);
return ContinueSentinel;
}
}
},
"catch": function(tryLoc) {
for (var i = this.tryEntries.length - 1; i >= 0; --i) {
var entry = this.tryEntries[i];
if (entry.tryLoc === tryLoc) {
var record = entry.completion;
if (record.type === "throw") {
var thrown = record.arg;
resetTryEntry(entry);
}
return thrown;
}
}
// The context.catch method must only be called with a location
// argument that corresponds to a known catch block.
throw new Error("illegal catch attempt");
},
delegateYield: function(iterable, resultName, nextLoc) {
this.delegate = {
iterator: values(iterable),
resultName: resultName,
nextLoc: nextLoc
};
if (this.method === "next") {
// Deliberately forget the last sent value so that we don't
// accidentally pass it on to the delegate.
this.arg = undefined$1;
}
return ContinueSentinel;
}
};
// Regardless of whether this script is executing as a CommonJS module
// or not, return the runtime object so that we can declare the variable
// regeneratorRuntime in the outer scope, which allows this module to be
// injected easily by `bin/regenerator --include-runtime script.js`.
return exports;
}(
// If this script is executing as a CommonJS module, use module.exports
// as the regeneratorRuntime namespace. Otherwise create a new empty
// object. Either way, the resulting object will be used to initialize
// the regeneratorRuntime variable at the top of this file.
module.exports
));
try {
regeneratorRuntime = runtime;
} catch (accidentalStrictMode) {
// This module should not be running in strict mode, so the above
// assignment should always work unless something is misconfigured. Just
// in case runtime.js accidentally runs in strict mode, in modern engines
// we can explicitly access globalThis. In older engines we can escape
// strict mode using a global Function call. This could conceivably fail
// if a Content Security Policy forbids using Function, but in that case
// the proper solution is to fix the accidental strict mode problem. If
// you've misconfigured your bundler to force strict mode and applied a
// CSP to forbid Function, and you're not willing to fix either of those
// problems, please detail your unique predicament in a GitHub issue.
if (typeof globalThis === "object") {
globalThis.regeneratorRuntime = runtime;
} else {
Function("r", "regeneratorRuntime = r")(runtime);
}
}
} (runtime));
var getId$3 = (prefix, cnt) => (
`${prefix}-${cnt}-${Math.random().toString(16).slice(3, 8)}`
);
const getId$2 = getId$3;
let jobCounter = 0;
var createJob$2 = ({
id: _id,
action,
payload = {},
}) => {
let id = _id;
if (typeof id === 'undefined') {
id = getId$2('Job', jobCounter);
jobCounter += 1;
}
return {
id,
action,
payload,
};
};
var log$2 = {};
let logging = false;
log$2.logging = logging;
log$2.setLogging = (_logging) => {
logging = _logging;
};
log$2.log = (...args) => (logging ? console.log.apply(this, args) : null);
const createJob$1 = createJob$2;
const { log: log$1 } = log$2;
const getId$1 = getId$3;
let schedulerCounter = 0;
var createScheduler$1 = () => {
const id = getId$1('Scheduler', schedulerCounter);
const workers = {};
const runningWorkers = {};
let jobQueue = [];
schedulerCounter += 1;
const getQueueLen = () => jobQueue.length;
const getNumWorkers = () => Object.keys(workers).length;
const dequeue = () => {
if (jobQueue.length !== 0) {
const wIds = Object.keys(workers);
for (let i = 0; i < wIds.length; i += 1) {
if (typeof runningWorkers[wIds[i]] === 'undefined') {
jobQueue[0](workers[wIds[i]]);
break;
}
}
}
};
const queue = (action, payload) => (
new Promise((resolve, reject) => {
const job = createJob$1({ action, payload });
jobQueue.push(async (w) => {
jobQueue.shift();
runningWorkers[w.id] = job;
try {
resolve(await w[action].apply(this, [...payload, job.id]));
} catch (err) {
reject(err);
} finally {
delete runningWorkers[w.id];
dequeue();
}
});
log$1(`[${id}]: Add ${job.id} to JobQueue`);
log$1(`[${id}]: JobQueue length=${jobQueue.length}`);
dequeue();
})
);
const addWorker = (w) => {
workers[w.id] = w;
log$1(`[${id}]: Add ${w.id}`);
log$1(`[${id}]: Number of workers=${getNumWorkers()}`);
dequeue();
return w.id;
};
const addJob = async (action, ...payload) => {
if (getNumWorkers() === 0) {
throw Error(`[${id}]: You need to have at least one worker before adding jobs`);
}
return queue(action, payload);
};
const terminate = async () => {
Object.keys(workers).forEach(async (wid) => {
await workers[wid].terminate();
});
jobQueue = [];
};
return {
addWorker,
addJob,
terminate,
getQueueLen,
getNumWorkers,
};
};
function commonjsRequire(path) {
throw new Error('Could not dynamically require "' + path + '". Please configure the dynamicRequireTargets or/and ignoreDynamicRequires option of @rollup/plugin-commonjs appropriately for this require call to work.');
}
// https://github.com/electron/electron/issues/2288
function isElectron$1() {
// Renderer process
if (typeof window !== 'undefined' && typeof window.process === 'object' && window.process.type === 'renderer') {
return true;
}
// Main process
if (typeof process !== 'undefined' && typeof process.versions === 'object' && !!process.versions.electron) {
return true;
}
// Detect the user agent when the `nodeIntegration` option is set to false
if (typeof navigator === 'object' && typeof navigator.userAgent === 'string' && navigator.userAgent.indexOf('Electron') >= 0) {
return true;
}
return false;
}
var isElectron_1 = isElectron$1;
const isElectron = isElectron_1;
var getEnvironment = (key) => {
const env = {};
if (typeof WorkerGlobalScope !== 'undefined') {
env.type = 'webworker';
} else if (isElectron()) {
env.type = 'electron';
} else if (typeof document === 'object') {
env.type = 'browser';
} else if (typeof process === 'object' && typeof commonjsRequire === 'function') {
env.type = 'node';
}
if (typeof key === 'undefined') {
return env;
}
return env[key];
};
const isBrowser = getEnvironment('type') === 'browser';
const resolveURL = isBrowser ? s => (new URL(s, window.location.href)).href : s => s; // eslint-disable-line
var resolvePaths$1 = (options) => {
const opts = { ...options };
['corePath', 'workerPath', 'langPath'].forEach((key) => {
if (options[key]) {
opts[key] = resolveURL(opts[key]);
}
});
return opts;
};
/**
* In the recognition result of tesseract, there
* is a deep JSON object for details, it has around
*
* The result of dump.js is a big JSON tree
* which can be easily serialized (for instance
* to be sent from a webworker to the main app
* or through Node's IPC), but we want
* a (circular) DOM-like interface for walking
* through the data.
*
* @fileoverview DOM-like interface for walking through data
* @author Kevin Kwok <antimatter15@gmail.com>
* @author Guillermo Webster <gui@mit.edu>
* @author Jerome Wu <jeromewus@gmail.com>
*/
var circularize$1 = (page) => {
const blocks = [];
const paragraphs = [];
const lines = [];
const words = [];
const symbols = [];
if (page.blocks) {
page.blocks.forEach((block) => {
block.paragraphs.forEach((paragraph) => {
paragraph.lines.forEach((line) => {
line.words.forEach((word) => {
word.symbols.forEach((sym) => {
symbols.push({
...sym, page, block, paragraph, line, word,
});
});
words.push({
...word, page, block, paragraph, line,
});
});
lines.push({
...line, page, block, paragraph,
});
});
paragraphs.push({
...paragraph, page, block,
});
});
blocks.push({
...block, page,
});
});
}
return {
...page, blocks, paragraphs, lines, words, symbols,
};
};
/*
* OEM = OCR Engine Mode, and there are 4 possible modes.
*
* By default tesseract.js uses LSTM_ONLY mode.
*
*/
var OEM$2 = {
TESSERACT_ONLY: 0,
LSTM_ONLY: 1,
TESSERACT_LSTM_COMBINED: 2,
DEFAULT: 3,
};
var version$1 = "5.1.0";
var require$$0 = {
version: version$1};
var defaultOptions$3 = {
/*
* Use BlobURL for worker script by default
* TODO: remove this option
*
*/
workerBlobURL: true,
logger: () => {},
};
const version = require$$0.version;
const defaultOptions$2 = defaultOptions$3;
/*
* Default options for browser worker
*/
var defaultOptions_1 = {
...defaultOptions$2,
workerPath: `https://cdn.jsdelivr.net/npm/tesseract.js@v${version}/dist/worker.min.js`,
};
/**
* spawnWorker
*
* @name spawnWorker
* @function create a new Worker in browser
* @access public
*/
var spawnWorker$2 = ({ workerPath, workerBlobURL }) => {
let worker;
if (Blob && URL && workerBlobURL) {
const blob = new Blob([`importScripts("${workerPath}");`], {
type: 'application/javascript',
});
worker = new Worker(URL.createObjectURL(blob));
} else {
worker = new Worker(workerPath);
}
return worker;
};
/**
* terminateWorker
*
* @name terminateWorker
* @function terminate worker
* @access public
*/
var terminateWorker$2 = (worker) => {
worker.terminate();
};
var onMessage$2 = (worker, handler) => {
worker.onmessage = ({ data }) => { // eslint-disable-line
handler(data);
};
};
/**
* send
*
* @name send
* @function send packet to worker and create a job
* @access public
*/
var send$2 = async (worker, packet) => {
worker.postMessage(packet);
};
/**
* readFromBlobOrFile
*
* @name readFromBlobOrFile
* @function
* @access private
*/
const readFromBlobOrFile = (blob) => (
new Promise((resolve, reject) => {
const fileReader = new FileReader();
fileReader.onload = () => {
resolve(fileReader.result);
};
fileReader.onerror = ({ target: { error: { code } } }) => {
reject(Error(`File could not be read! Code=${code}`));
};
fileReader.readAsArrayBuffer(blob);
})
);
/**
* loadImage
*
* @name loadImage
* @function load image from different source
* @access private
*/
const loadImage$2 = async (image) => {
let data = image;
if (typeof image === 'undefined') {
return 'undefined';
}
if (typeof image === 'string') {
// Base64 Image
if (/data:image\/([a-zA-Z]*);base64,([^"]*)/.test(image)) {
data = atob(image.split(',')[1])
.split('')
.map((c) => c.charCodeAt(0));
} else {
const resp = await fetch(image);
data = await resp.arrayBuffer();
}
} else if (typeof HTMLElement !== 'undefined' && image instanceof HTMLElement) {
if (image.tagName === 'IMG') {
data = await loadImage$2(image.src);
}
if (image.tagName === 'VIDEO') {
data = await loadImage$2(image.poster);
}
if (image.tagName === 'CANVAS') {
await new Promise((resolve) => {
image.toBlob(async (blob) => {
data = await readFromBlobOrFile(blob);
resolve();
});
});
}
} else if (typeof OffscreenCanvas !== 'undefined' && image instanceof OffscreenCanvas) {
const blob = await image.convertToBlob();
data = await readFromBlobOrFile(blob);
} else if (image instanceof File || image instanceof Blob) {
data = await readFromBlobOrFile(image);
}
return new Uint8Array(data);
};
var loadImage_1 = loadImage$2;
/**
*
* Tesseract Worker adapter for browser
*
* @fileoverview Tesseract Worker adapter for browser
* @author Kevin Kwok <antimatter15@gmail.com>
* @author Guillermo Webster <gui@mit.edu>
* @author Jerome Wu <jeromewus@gmail.com>
*/
const defaultOptions$1 = defaultOptions_1;
const spawnWorker$1 = spawnWorker$2;
const terminateWorker$1 = terminateWorker$2;
const onMessage$1 = onMessage$2;
const send$1 = send$2;
const loadImage$1 = loadImage_1;
var browser = {
defaultOptions: defaultOptions$1,
spawnWorker: spawnWorker$1,
terminateWorker: terminateWorker$1,
onMessage: onMessage$1,
send: send$1,
loadImage: loadImage$1,
};
const resolvePaths = resolvePaths$1;
const circularize = circularize$1;
const createJob = createJob$2;
const { log } = log$2;
const getId = getId$3;
const OEM$1 = OEM$2;
const {
defaultOptions,
spawnWorker,
terminateWorker,
onMessage,
loadImage,
send,
} = browser;
let workerCounter = 0;
var createWorker$2 = async (langs = 'eng', oem = OEM$1.LSTM_ONLY, _options = {}, config = {}) => {
const id = getId('Worker', workerCounter);
const {
logger,
errorHandler,
...options
} = resolvePaths({
...defaultOptions,
..._options,
});
const resolves = {};
const rejects = {};
// Current langs, oem, and config file.
// Used if the user ever re-initializes the worker using `worker.reinitialize`.
const currentLangs = typeof langs === 'string' ? langs.split('+')