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node_modules/pdf-lib/es/core/PDFContext.js
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199
node_modules/pdf-lib/es/core/PDFContext.js
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import { __assign } from "tslib";
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import pako from 'pako';
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import PDFHeader from "./document/PDFHeader";
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import { UnexpectedObjectTypeError } from "./errors";
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import PDFArray from "./objects/PDFArray";
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import PDFBool from "./objects/PDFBool";
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import PDFDict from "./objects/PDFDict";
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import PDFName from "./objects/PDFName";
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import PDFNull from "./objects/PDFNull";
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import PDFNumber from "./objects/PDFNumber";
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import PDFObject from "./objects/PDFObject";
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import PDFRawStream from "./objects/PDFRawStream";
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import PDFRef from "./objects/PDFRef";
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import PDFOperator from "./operators/PDFOperator";
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import Ops from "./operators/PDFOperatorNames";
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import PDFContentStream from "./structures/PDFContentStream";
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import { typedArrayFor } from "../utils";
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import { SimpleRNG } from "../utils/rng";
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var byAscendingObjectNumber = function (_a, _b) {
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var a = _a[0];
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var b = _b[0];
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return a.objectNumber - b.objectNumber;
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};
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var PDFContext = /** @class */ (function () {
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function PDFContext() {
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this.largestObjectNumber = 0;
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this.header = PDFHeader.forVersion(1, 7);
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this.trailerInfo = {};
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this.indirectObjects = new Map();
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this.rng = SimpleRNG.withSeed(1);
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}
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PDFContext.prototype.assign = function (ref, object) {
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this.indirectObjects.set(ref, object);
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if (ref.objectNumber > this.largestObjectNumber) {
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this.largestObjectNumber = ref.objectNumber;
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}
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};
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PDFContext.prototype.nextRef = function () {
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this.largestObjectNumber += 1;
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return PDFRef.of(this.largestObjectNumber);
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};
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PDFContext.prototype.register = function (object) {
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var ref = this.nextRef();
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this.assign(ref, object);
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return ref;
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};
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PDFContext.prototype.delete = function (ref) {
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return this.indirectObjects.delete(ref);
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};
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PDFContext.prototype.lookupMaybe = function (ref) {
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var types = [];
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for (var _i = 1; _i < arguments.length; _i++) {
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types[_i - 1] = arguments[_i];
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}
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// TODO: `preservePDFNull` is for backwards compatibility. Should be
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// removed in next breaking API change.
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var preservePDFNull = types.includes(PDFNull);
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var result = ref instanceof PDFRef ? this.indirectObjects.get(ref) : ref;
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if (!result || (result === PDFNull && !preservePDFNull))
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return undefined;
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for (var idx = 0, len = types.length; idx < len; idx++) {
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var type = types[idx];
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if (type === PDFNull) {
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if (result === PDFNull)
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return result;
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}
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else {
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if (result instanceof type)
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return result;
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}
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}
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throw new UnexpectedObjectTypeError(types, result);
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};
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PDFContext.prototype.lookup = function (ref) {
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var types = [];
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for (var _i = 1; _i < arguments.length; _i++) {
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types[_i - 1] = arguments[_i];
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}
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var result = ref instanceof PDFRef ? this.indirectObjects.get(ref) : ref;
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if (types.length === 0)
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return result;
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for (var idx = 0, len = types.length; idx < len; idx++) {
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var type = types[idx];
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if (type === PDFNull) {
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if (result === PDFNull)
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return result;
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}
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else {
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if (result instanceof type)
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return result;
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}
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}
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throw new UnexpectedObjectTypeError(types, result);
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};
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PDFContext.prototype.getObjectRef = function (pdfObject) {
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var entries = Array.from(this.indirectObjects.entries());
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for (var idx = 0, len = entries.length; idx < len; idx++) {
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var _a = entries[idx], ref = _a[0], object = _a[1];
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if (object === pdfObject) {
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return ref;
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}
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}
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return undefined;
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};
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PDFContext.prototype.enumerateIndirectObjects = function () {
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return Array.from(this.indirectObjects.entries()).sort(byAscendingObjectNumber);
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};
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PDFContext.prototype.obj = function (literal) {
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if (literal instanceof PDFObject) {
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return literal;
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}
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else if (literal === null || literal === undefined) {
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return PDFNull;
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}
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else if (typeof literal === 'string') {
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return PDFName.of(literal);
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}
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else if (typeof literal === 'number') {
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return PDFNumber.of(literal);
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}
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else if (typeof literal === 'boolean') {
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return literal ? PDFBool.True : PDFBool.False;
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}
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else if (Array.isArray(literal)) {
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var array = PDFArray.withContext(this);
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for (var idx = 0, len = literal.length; idx < len; idx++) {
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array.push(this.obj(literal[idx]));
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}
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return array;
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}
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else {
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var dict = PDFDict.withContext(this);
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var keys = Object.keys(literal);
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for (var idx = 0, len = keys.length; idx < len; idx++) {
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var key = keys[idx];
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var value = literal[key];
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if (value !== undefined)
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dict.set(PDFName.of(key), this.obj(value));
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}
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return dict;
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}
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};
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PDFContext.prototype.stream = function (contents, dict) {
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if (dict === void 0) { dict = {}; }
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return PDFRawStream.of(this.obj(dict), typedArrayFor(contents));
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};
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PDFContext.prototype.flateStream = function (contents, dict) {
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if (dict === void 0) { dict = {}; }
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return this.stream(pako.deflate(typedArrayFor(contents)), __assign(__assign({}, dict), { Filter: 'FlateDecode' }));
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};
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PDFContext.prototype.contentStream = function (operators, dict) {
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if (dict === void 0) { dict = {}; }
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return PDFContentStream.of(this.obj(dict), operators);
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};
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PDFContext.prototype.formXObject = function (operators, dict) {
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if (dict === void 0) { dict = {}; }
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return this.contentStream(operators, __assign(__assign({ BBox: this.obj([0, 0, 0, 0]), Matrix: this.obj([1, 0, 0, 1, 0, 0]) }, dict), { Type: 'XObject', Subtype: 'Form' }));
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};
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/*
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* Reference to PDFContentStream that contains a single PDFOperator: `q`.
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* Used by [[PDFPageLeaf]] instances to ensure that when content streams are
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* added to a modified PDF, they start in the default, unchanged graphics
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* state.
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*/
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PDFContext.prototype.getPushGraphicsStateContentStream = function () {
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if (this.pushGraphicsStateContentStreamRef) {
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return this.pushGraphicsStateContentStreamRef;
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}
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var dict = this.obj({});
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var op = PDFOperator.of(Ops.PushGraphicsState);
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var stream = PDFContentStream.of(dict, [op]);
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this.pushGraphicsStateContentStreamRef = this.register(stream);
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return this.pushGraphicsStateContentStreamRef;
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};
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/*
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* Reference to PDFContentStream that contains a single PDFOperator: `Q`.
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* Used by [[PDFPageLeaf]] instances to ensure that when content streams are
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* added to a modified PDF, they start in the default, unchanged graphics
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* state.
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*/
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PDFContext.prototype.getPopGraphicsStateContentStream = function () {
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if (this.popGraphicsStateContentStreamRef) {
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return this.popGraphicsStateContentStreamRef;
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}
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var dict = this.obj({});
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var op = PDFOperator.of(Ops.PopGraphicsState);
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var stream = PDFContentStream.of(dict, [op]);
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this.popGraphicsStateContentStreamRef = this.register(stream);
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return this.popGraphicsStateContentStreamRef;
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};
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PDFContext.prototype.addRandomSuffix = function (prefix, suffixLength) {
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if (suffixLength === void 0) { suffixLength = 4; }
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return prefix + "-" + Math.floor(this.rng.nextInt() * Math.pow(10, suffixLength));
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};
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PDFContext.create = function () { return new PDFContext(); };
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return PDFContext;
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}());
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export default PDFContext;
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//# sourceMappingURL=PDFContext.js.map
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