pdf-lib
Version:
Create and modify PDF files with JavaScript
201 lines • 8.98 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var tslib_1 = require("tslib");
var pako_1 = tslib_1.__importDefault(require("pako"));
var PDFHeader_1 = tslib_1.__importDefault(require("./document/PDFHeader"));
var errors_1 = require("./errors");
var PDFArray_1 = tslib_1.__importDefault(require("./objects/PDFArray"));
var PDFBool_1 = tslib_1.__importDefault(require("./objects/PDFBool"));
var PDFDict_1 = tslib_1.__importDefault(require("./objects/PDFDict"));
var PDFName_1 = tslib_1.__importDefault(require("./objects/PDFName"));
var PDFNull_1 = tslib_1.__importDefault(require("./objects/PDFNull"));
var PDFNumber_1 = tslib_1.__importDefault(require("./objects/PDFNumber"));
var PDFObject_1 = tslib_1.__importDefault(require("./objects/PDFObject"));
var PDFRawStream_1 = tslib_1.__importDefault(require("./objects/PDFRawStream"));
var PDFRef_1 = tslib_1.__importDefault(require("./objects/PDFRef"));
var PDFOperator_1 = tslib_1.__importDefault(require("./operators/PDFOperator"));
var PDFOperatorNames_1 = tslib_1.__importDefault(require("./operators/PDFOperatorNames"));
var PDFContentStream_1 = tslib_1.__importDefault(require("./structures/PDFContentStream"));
var utils_1 = require("../utils");
var rng_1 = require("../utils/rng");
var byAscendingObjectNumber = function (_a, _b) {
var a = _a[0];
var b = _b[0];
return a.objectNumber - b.objectNumber;
};
var PDFContext = /** @class */ (function () {
function PDFContext() {
this.largestObjectNumber = 0;
this.header = PDFHeader_1.default.forVersion(1, 7);
this.trailerInfo = {};
this.indirectObjects = new Map();
this.rng = rng_1.SimpleRNG.withSeed(1);
}
PDFContext.prototype.assign = function (ref, object) {
this.indirectObjects.set(ref, object);
if (ref.objectNumber > this.largestObjectNumber) {
this.largestObjectNumber = ref.objectNumber;
}
};
PDFContext.prototype.nextRef = function () {
this.largestObjectNumber += 1;
return PDFRef_1.default.of(this.largestObjectNumber);
};
PDFContext.prototype.register = function (object) {
var ref = this.nextRef();
this.assign(ref, object);
return ref;
};
PDFContext.prototype.delete = function (ref) {
return this.indirectObjects.delete(ref);
};
PDFContext.prototype.lookupMaybe = function (ref) {
var types = [];
for (var _i = 1; _i < arguments.length; _i++) {
types[_i - 1] = arguments[_i];
}
// TODO: `preservePDFNull` is for backwards compatibility. Should be
// removed in next breaking API change.
var preservePDFNull = types.includes(PDFNull_1.default);
var result = ref instanceof PDFRef_1.default ? this.indirectObjects.get(ref) : ref;
if (!result || (result === PDFNull_1.default && !preservePDFNull))
return undefined;
for (var idx = 0, len = types.length; idx < len; idx++) {
var type = types[idx];
if (type === PDFNull_1.default) {
if (result === PDFNull_1.default)
return result;
}
else {
if (result instanceof type)
return result;
}
}
throw new errors_1.UnexpectedObjectTypeError(types, result);
};
PDFContext.prototype.lookup = function (ref) {
var types = [];
for (var _i = 1; _i < arguments.length; _i++) {
types[_i - 1] = arguments[_i];
}
var result = ref instanceof PDFRef_1.default ? this.indirectObjects.get(ref) : ref;
if (types.length === 0)
return result;
for (var idx = 0, len = types.length; idx < len; idx++) {
var type = types[idx];
if (type === PDFNull_1.default) {
if (result === PDFNull_1.default)
return result;
}
else {
if (result instanceof type)
return result;
}
}
throw new errors_1.UnexpectedObjectTypeError(types, result);
};
PDFContext.prototype.getObjectRef = function (pdfObject) {
var entries = Array.from(this.indirectObjects.entries());
for (var idx = 0, len = entries.length; idx < len; idx++) {
var _a = entries[idx], ref = _a[0], object = _a[1];
if (object === pdfObject) {
return ref;
}
}
return undefined;
};
PDFContext.prototype.enumerateIndirectObjects = function () {
return Array.from(this.indirectObjects.entries()).sort(byAscendingObjectNumber);
};
PDFContext.prototype.obj = function (literal) {
if (literal instanceof PDFObject_1.default) {
return literal;
}
else if (literal === null || literal === undefined) {
return PDFNull_1.default;
}
else if (typeof literal === 'string') {
return PDFName_1.default.of(literal);
}
else if (typeof literal === 'number') {
return PDFNumber_1.default.of(literal);
}
else if (typeof literal === 'boolean') {
return literal ? PDFBool_1.default.True : PDFBool_1.default.False;
}
else if (Array.isArray(literal)) {
var array = PDFArray_1.default.withContext(this);
for (var idx = 0, len = literal.length; idx < len; idx++) {
array.push(this.obj(literal[idx]));
}
return array;
}
else {
var dict = PDFDict_1.default.withContext(this);
var keys = Object.keys(literal);
for (var idx = 0, len = keys.length; idx < len; idx++) {
var key = keys[idx];
var value = literal[key];
if (value !== undefined)
dict.set(PDFName_1.default.of(key), this.obj(value));
}
return dict;
}
};
PDFContext.prototype.stream = function (contents, dict) {
if (dict === void 0) { dict = {}; }
return PDFRawStream_1.default.of(this.obj(dict), utils_1.typedArrayFor(contents));
};
PDFContext.prototype.flateStream = function (contents, dict) {
if (dict === void 0) { dict = {}; }
return this.stream(pako_1.default.deflate(utils_1.typedArrayFor(contents)), tslib_1.__assign(tslib_1.__assign({}, dict), { Filter: 'FlateDecode' }));
};
PDFContext.prototype.contentStream = function (operators, dict) {
if (dict === void 0) { dict = {}; }
return PDFContentStream_1.default.of(this.obj(dict), operators);
};
PDFContext.prototype.formXObject = function (operators, dict) {
if (dict === void 0) { dict = {}; }
return this.contentStream(operators, tslib_1.__assign(tslib_1.__assign({ BBox: this.obj([0, 0, 0, 0]), Matrix: this.obj([1, 0, 0, 1, 0, 0]) }, dict), { Type: 'XObject', Subtype: 'Form' }));
};
/*
* Reference to PDFContentStream that contains a single PDFOperator: `q`.
* Used by [[PDFPageLeaf]] instances to ensure that when content streams are
* added to a modified PDF, they start in the default, unchanged graphics
* state.
*/
PDFContext.prototype.getPushGraphicsStateContentStream = function () {
if (this.pushGraphicsStateContentStreamRef) {
return this.pushGraphicsStateContentStreamRef;
}
var dict = this.obj({});
var op = PDFOperator_1.default.of(PDFOperatorNames_1.default.PushGraphicsState);
var stream = PDFContentStream_1.default.of(dict, [op]);
this.pushGraphicsStateContentStreamRef = this.register(stream);
return this.pushGraphicsStateContentStreamRef;
};
/*
* Reference to PDFContentStream that contains a single PDFOperator: `Q`.
* Used by [[PDFPageLeaf]] instances to ensure that when content streams are
* added to a modified PDF, they start in the default, unchanged graphics
* state.
*/
PDFContext.prototype.getPopGraphicsStateContentStream = function () {
if (this.popGraphicsStateContentStreamRef) {
return this.popGraphicsStateContentStreamRef;
}
var dict = this.obj({});
var op = PDFOperator_1.default.of(PDFOperatorNames_1.default.PopGraphicsState);
var stream = PDFContentStream_1.default.of(dict, [op]);
this.popGraphicsStateContentStreamRef = this.register(stream);
return this.popGraphicsStateContentStreamRef;
};
PDFContext.prototype.addRandomSuffix = function (prefix, suffixLength) {
if (suffixLength === void 0) { suffixLength = 4; }
return prefix + "-" + Math.floor(this.rng.nextInt() * Math.pow(10, suffixLength));
};
PDFContext.create = function () { return new PDFContext(); };
return PDFContext;
}());
exports.default = PDFContext;
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