181 lines
6.8 KiB
TypeScript
181 lines
6.8 KiB
TypeScript
/*
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* QR Code generator demo (TypeScript)
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*
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* Copyright (c) Project Nayuki. (MIT License)
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* https://www.nayuki.io/page/qr-code-generator-library
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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* - The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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* - The Software is provided "as is", without warranty of any kind, express or
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* implied, including but not limited to the warranties of merchantability,
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* fitness for a particular purpose and noninfringement. In no event shall the
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* authors or copyright holders be liable for any claim, damages or other
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* liability, whether in an action of contract, tort or otherwise, arising from,
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* out of or in connection with the Software or the use or other dealings in the
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* Software.
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*/
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"use strict";
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{
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const myWindow = window as any;
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/*---- Functions called from HTML code ----*/
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myWindow.redrawQrCode = (): void => {
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// Show/hide rows based on bitmap/vector image output
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const bitmapOutput: boolean = getInput("output-format-bitmap").checked;
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const scaleRow : HTMLElement = getElem("scale-row");
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const svgXmlRow: HTMLElement = getElem("svg-xml-row");
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if (bitmapOutput) {
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scaleRow.style.removeProperty("display");
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svgXmlRow.style.display = "none";
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} else {
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scaleRow.style.display = "none";
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svgXmlRow.style.removeProperty("display");
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}
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const svgXml = getElem("svg-xml-output") as HTMLTextAreaElement;
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svgXml.value = "";
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// Reset output images in case of early termination
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const canvas = getElem("qrcode-canvas") as HTMLCanvasElement;
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const svg = (document.getElementById("qrcode-svg") as Element) as SVGElement;
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canvas.style.display = "none";
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svg.style.display = "none";
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// Returns a QrCode.Ecc object based on the radio buttons in the HTML form.
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function getInputErrorCorrectionLevel(): qrcodegen.QrCode.Ecc {
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if (getInput("errcorlvl-medium").checked)
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return qrcodegen.QrCode.Ecc.MEDIUM;
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else if (getInput("errcorlvl-quartile").checked)
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return qrcodegen.QrCode.Ecc.QUARTILE;
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else if (getInput("errcorlvl-high").checked)
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return qrcodegen.QrCode.Ecc.HIGH;
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else // In case no radio button is depressed
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return qrcodegen.QrCode.Ecc.LOW;
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}
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// Get form inputs and compute QR Code
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const ecl: qrcodegen.QrCode.Ecc = getInputErrorCorrectionLevel();
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const text: string = (getElem("text-input") as HTMLTextAreaElement).value;
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const segs: Array<qrcodegen.QrSegment> = qrcodegen.QrSegment.makeSegments(text);
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const minVer: number = parseInt(getInput("version-min-input").value, 10);
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const maxVer: number = parseInt(getInput("version-max-input").value, 10);
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const mask: number = parseInt(getInput("mask-input").value, 10);
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const boostEcc: boolean = getInput("boost-ecc-input").checked;
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const qr: qrcodegen.QrCode = qrcodegen.QrCode.encodeSegments(segs, ecl, minVer, maxVer, mask, boostEcc);
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// Draw image output
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const border: number = parseInt(getInput("border-input").value, 10);
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if (border < 0 || border > 100)
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return;
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if (bitmapOutput) {
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const scale: number = parseInt(getInput("scale-input").value, 10);
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if (scale <= 0 || scale > 30)
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return;
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qr.drawCanvas(scale, border, canvas);
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canvas.style.removeProperty("display");
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} else {
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const code: string = qr.toSvgString(border);
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const viewBox: string = (/ viewBox="([^"]*)"/.exec(code) as RegExpExecArray)[1];
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const pathD: string = (/ d="([^"]*)"/.exec(code) as RegExpExecArray)[1];
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svg.setAttribute("viewBox", viewBox);
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(svg.querySelector("path") as Element).setAttribute("d", pathD);
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svg.style.removeProperty("display");
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svgXml.value = qr.toSvgString(border);
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}
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// Returns a string to describe the given list of segments.
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function describeSegments(segs: Array<qrcodegen.QrSegment>): string {
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if (segs.length == 0)
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return "none";
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else if (segs.length == 1) {
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const mode: qrcodegen.QrSegment.Mode = segs[0].mode;
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const Mode = qrcodegen.QrSegment.Mode;
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if (mode == Mode.NUMERIC ) return "numeric";
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if (mode == Mode.ALPHANUMERIC) return "alphanumeric";
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if (mode == Mode.BYTE ) return "byte";
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if (mode == Mode.KANJI ) return "kanji";
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return "unknown";
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} else
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return "multiple";
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}
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// Returns the number of Unicode code points in the given UTF-16 string.
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function countUnicodeChars(str: string): number {
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let result: number = 0;
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for (let i = 0; i < str.length; i++, result++) {
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const c: number = str.charCodeAt(i);
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if (c < 0xD800 || c >= 0xE000)
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continue;
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else if (0xD800 <= c && c < 0xDC00 && i + 1 < str.length) { // High surrogate
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i++;
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const d: number = str.charCodeAt(i);
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if (0xDC00 <= d && d < 0xE000) // Low surrogate
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continue;
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}
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throw "Invalid UTF-16 string";
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}
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return result;
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}
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// Show the QR Code symbol's statistics as a string
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getElem("statistics-output").textContent = `QR Code version = ${qr.version}, ` +
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`mask pattern = ${qr.mask}, ` +
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`character count = ${countUnicodeChars(text)},\n` +
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`encoding mode = ${describeSegments(segs)}, ` +
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`error correction = level ${"LMQH".charAt(qr.errorCorrectionLevel.ordinal)}, ` +
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`data bits = ${qrcodegen.QrSegment.getTotalBits(segs, qr.version) as number}.`;
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}
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myWindow.handleVersionMinMax = (which: "min"|"max"): void => {
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const minElem: HTMLInputElement = getInput("version-min-input");
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const maxElem: HTMLInputElement = getInput("version-max-input");
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let minVal: number = parseInt(minElem.value, 10);
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let maxVal: number = parseInt(maxElem.value, 10);
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minVal = Math.max(Math.min(minVal, qrcodegen.QrCode.MAX_VERSION), qrcodegen.QrCode.MIN_VERSION);
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maxVal = Math.max(Math.min(maxVal, qrcodegen.QrCode.MAX_VERSION), qrcodegen.QrCode.MIN_VERSION);
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if (which == "min" && minVal > maxVal)
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maxVal = minVal;
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else if (which == "max" && maxVal < minVal)
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minVal = maxVal;
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minElem.value = minVal.toString();
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maxElem.value = maxVal.toString();
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myWindow.redrawQrCode();
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}
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/*---- Private helper functions ----*/
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function getElem(id: string): HTMLElement {
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const result: HTMLElement|null = document.getElementById(id);
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if (result instanceof HTMLElement)
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return result;
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throw "Assertion error";
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}
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function getInput(id: string): HTMLInputElement {
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const result: HTMLElement = getElem(id);
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if (result instanceof HTMLInputElement)
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return result;
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throw "Assertion error";
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}
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/*---- Initialization ----*/
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myWindow.redrawQrCode();
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}
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