libxslt-wasm/dist/parser/XmlOutputBuffer.js

JavaScript bindings for libxslt compiled to WebAssembly

import { NULL_POINTER } from "../constants.js";
import { stringToNewUTF8, UTF8ToString } from "../internal/emscripten.js";
import { xmlAllocOutputBuffer, xmlOutputBufferGetSize, xmlOutputBufferGetContent, xmlOutputBufferClose, xmlCharEncoding, xmlOutputBufferWriteString, } from "../internal/libxml2.js";
import { free } from "../internal/main.js";
import { DataSegment } from "../utils/DataSegment.js";
class XmlOutputBuffer extends DataSegment {
    /**
     * Allocate a new XML output buffer (`xmlOutputBufferPtr`) and return the
     * wrapper class
     */
    static allocate(encoding = "NONE") {
        const bufferPtr = xmlAllocOutputBuffer(xmlCharEncoding[encoding].value);
        if (bufferPtr === NULL_POINTER) {
            throw new ReferenceError("Failed to allocate memory for XML output buffer");
        }
        return new XmlOutputBuffer(bufferPtr);
    }
    /**
     * Returns length of the data currently held in the output buffer
     */
    get size() {
        return this.dataOffset !== null ?
            xmlOutputBufferGetSize(this.dataOffset)
            : 0;
    }
    writeString(str) {
        if (this.dataOffset === null) {
            throw new Error("XML output buffer already disposed");
        }
        const strPtr = stringToNewUTF8(str);
        const bytesWritten = xmlOutputBufferWriteString(this.dataOffset, strPtr);
        free(strPtr);
        if (bytesWritten === -1) {
            throw new Error(`Failed to write ${str} to XML output buffer`);
        }
    }
    toString() {
        if (this.dataOffset === null) {
            throw new Error("XML output buffer already disposed");
        }
        const content = xmlOutputBufferGetContent(this.dataOffset);
        const outputString = UTF8ToString(content);
        return outputString;
    }
    delete() {
        if (this.dataOffset === null) {
            throw new Error("XML output buffer already disposed");
        }
        const bytesWritten = xmlOutputBufferClose(this.dataOffset);
        if (bytesWritten < 0) {
            // bytesWritten is negative of enum `xmlParserErrors`
            throw new Error(`XML Parser Errors ${Math.abs(bytesWritten)}: Failed to close XML output buffer`);
        }
        super.delete();
    }
}
export { XmlOutputBuffer };