@cantoo/pdf-lib
Version:
Create and modify PDF files with JavaScript
229 lines • 9.87 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const tslib_1 = require("tslib");
const pako_1 = tslib_1.__importDefault(require("pako"));
const PDFHeader_1 = tslib_1.__importDefault(require("./document/PDFHeader"));
const errors_1 = require("./errors");
const PDFArray_1 = tslib_1.__importDefault(require("./objects/PDFArray"));
const PDFBool_1 = tslib_1.__importDefault(require("./objects/PDFBool"));
const PDFDict_1 = tslib_1.__importDefault(require("./objects/PDFDict"));
const PDFHexString_1 = tslib_1.__importDefault(require("./objects/PDFHexString"));
const PDFName_1 = tslib_1.__importDefault(require("./objects/PDFName"));
const PDFNull_1 = tslib_1.__importDefault(require("./objects/PDFNull"));
const PDFNumber_1 = tslib_1.__importDefault(require("./objects/PDFNumber"));
const PDFObject_1 = tslib_1.__importDefault(require("./objects/PDFObject"));
const PDFRawStream_1 = tslib_1.__importDefault(require("./objects/PDFRawStream"));
const PDFRef_1 = tslib_1.__importDefault(require("./objects/PDFRef"));
const PDFStream_1 = tslib_1.__importDefault(require("./objects/PDFStream"));
const PDFString_1 = tslib_1.__importDefault(require("./objects/PDFString"));
const PDFOperator_1 = tslib_1.__importDefault(require("./operators/PDFOperator"));
const PDFOperatorNames_1 = tslib_1.__importDefault(require("./operators/PDFOperatorNames"));
const PDFContentStream_1 = tslib_1.__importDefault(require("./structures/PDFContentStream"));
const utils_1 = require("../utils");
const rng_1 = require("../utils/rng");
const byAscendingObjectNumber = ([a], [b]) => a.objectNumber - b.objectNumber;
class PDFContext {
constructor() {
this.isDecrypted = true;
this.largestObjectNumber = 0;
this.header = PDFHeader_1.default.forVersion(1, 7);
this.trailerInfo = {};
this.indirectObjects = new Map();
this.rng = rng_1.SimpleRNG.withSeed(1);
}
assign(ref, object) {
this.indirectObjects.set(ref, object);
if (ref.objectNumber > this.largestObjectNumber) {
this.largestObjectNumber = ref.objectNumber;
}
}
nextRef() {
this.largestObjectNumber += 1;
return PDFRef_1.default.of(this.largestObjectNumber);
}
register(object) {
const ref = this.nextRef();
this.assign(ref, object);
return ref;
}
delete(ref) {
return this.indirectObjects.delete(ref);
}
lookupMaybe(ref, ...types) {
// TODO: `preservePDFNull` is for backwards compatibility. Should be
// removed in next breaking API change.
const preservePDFNull = types.includes(PDFNull_1.default);
const result = ref instanceof PDFRef_1.default ? this.indirectObjects.get(ref) : ref;
if (!result || (result === PDFNull_1.default && !preservePDFNull))
return undefined;
for (let idx = 0, len = types.length; idx < len; idx++) {
const 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);
}
lookup(ref, ...types) {
const result = ref instanceof PDFRef_1.default ? this.indirectObjects.get(ref) : ref;
if (types.length === 0)
return result;
for (let idx = 0, len = types.length; idx < len; idx++) {
const 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);
}
getObjectRef(pdfObject) {
const entries = Array.from(this.indirectObjects.entries());
for (let idx = 0, len = entries.length; idx < len; idx++) {
const [ref, object] = entries[idx];
if (object === pdfObject) {
return ref;
}
}
return undefined;
}
enumerateIndirectObjects() {
return Array.from(this.indirectObjects.entries()).sort(byAscendingObjectNumber);
}
obj(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 (literal instanceof Uint8Array) {
return PDFHexString_1.default.fromBytes(literal);
}
else if (Array.isArray(literal)) {
const array = PDFArray_1.default.withContext(this);
for (let idx = 0, len = literal.length; idx < len; idx++) {
array.push(this.obj(literal[idx]));
}
return array;
}
else {
const dict = PDFDict_1.default.withContext(this);
const keys = Object.keys(literal);
for (let idx = 0, len = keys.length; idx < len; idx++) {
const key = keys[idx];
const value = literal[key];
if (value !== undefined)
dict.set(PDFName_1.default.of(key), this.obj(value));
}
return dict;
}
}
getLiteral(obj, { deep = true, literalRef = false, literalStreamDict = false, literalString = false, } = {}) {
const cfg = { deep, literalRef, literalStreamDict, literalString };
if (obj instanceof PDFArray_1.default) {
const lit = obj.asArray();
return deep ? lit.map((value) => this.getLiteral(value, cfg)) : lit;
}
else if (obj instanceof PDFBool_1.default) {
return obj.asBoolean();
}
else if (obj instanceof PDFDict_1.default) {
const lit = {};
const entries = obj.entries();
for (let idx = 0, len = entries.length; idx < len; idx++) {
const [name, value] = entries[idx];
lit[this.getLiteral(name)] = deep ? this.getLiteral(value, cfg) : value;
}
return lit;
}
else if (obj instanceof PDFName_1.default) {
return obj.decodeText();
}
else if (obj === PDFNull_1.default) {
return null;
}
else if (obj instanceof PDFNumber_1.default) {
return obj.asNumber();
}
else if (obj instanceof PDFRef_1.default && literalRef) {
return obj.objectNumber;
}
else if (obj instanceof PDFStream_1.default && literalStreamDict) {
return this.getLiteral(obj.dict, cfg);
}
else if ((obj instanceof PDFString_1.default || obj instanceof PDFHexString_1.default) &&
literalString) {
return obj.asString();
}
return obj;
}
stream(contents, dict = {}) {
return PDFRawStream_1.default.of(this.obj(dict), (0, utils_1.typedArrayFor)(contents));
}
flateStream(contents, dict = {}) {
return this.stream(pako_1.default.deflate((0, utils_1.typedArrayFor)(contents)), Object.assign(Object.assign({}, dict), { Filter: 'FlateDecode' }));
}
contentStream(operators, dict = {}) {
return PDFContentStream_1.default.of(this.obj(dict), operators);
}
formXObject(operators, dict = {}) {
return this.contentStream(operators, Object.assign(Object.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.
*/
getPushGraphicsStateContentStream() {
if (this.pushGraphicsStateContentStreamRef) {
return this.pushGraphicsStateContentStreamRef;
}
const dict = this.obj({});
const op = PDFOperator_1.default.of(PDFOperatorNames_1.default.PushGraphicsState);
const 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.
*/
getPopGraphicsStateContentStream() {
if (this.popGraphicsStateContentStreamRef) {
return this.popGraphicsStateContentStreamRef;
}
const dict = this.obj({});
const op = PDFOperator_1.default.of(PDFOperatorNames_1.default.PopGraphicsState);
const stream = PDFContentStream_1.default.of(dict, [op]);
this.popGraphicsStateContentStreamRef = this.register(stream);
return this.popGraphicsStateContentStreamRef;
}
addRandomSuffix(prefix, suffixLength = 4) {
return `${prefix}-${Math.floor(this.rng.nextInt() * Math.pow(10, suffixLength))}`;
}
}
PDFContext.create = () => new PDFContext();
exports.default = PDFContext;
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