libxslt-wasm/dist/utils/StringPtrArray.js

JavaScript bindings for libxslt compiled to WebAssembly

import { DataSegment } from "./DataSegment.js";
import { POINTER_SIZE } from "../constants.js";
import { setValue, stringToNewUTF8 } from "../internal/emscripten.js";
import { free, calloc } from "../internal/main.js";
/**
 * An array of pointers to UTF-8 encoded strings or `.dataOffset` == `char**`.
 * May be null terminated
 */
class StringPtrArray extends DataSegment {
    stringPtrArray = [];
    isNullTerminated = false;
    static fromStringArray(stringArray, isNullTerminated = false) {
        if (stringArray.length === 0) {
            throw new Error("StringPtrArray.fromStringArray array must have a length");
        }
        const stringPtrArray = stringArray.map((str) => stringToNewUTF8(str));
        const stringPtrArrayPtr = calloc(stringPtrArray.length + (isNullTerminated ? 1 : 0), POINTER_SIZE);
        stringPtrArray.forEach((stringPtr, index) => {
            setValue(stringPtrArrayPtr + index * POINTER_SIZE, stringPtr, "*");
        });
        return Object.assign(new StringPtrArray(stringPtrArrayPtr), {
            stringPtrArray: stringPtrArray,
            isNullTerminated: isNullTerminated,
        });
    }
    // Aligns with `TypedArray` API
    get byteLength() {
        return (this.stringPtrArray.length * POINTER_SIZE +
            (this.isNullTerminated ? POINTER_SIZE : 0));
    }
    delete() {
        this.stringPtrArray.forEach((stringPtr) => {
            free(stringPtr);
        });
        if (this.dataOffset !== null) {
            free(this.dataOffset);
        }
        this.stringPtrArray = [];
        super.delete();
    }
}
export { StringPtrArray };