status-im/QR-Code-generator
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Reorganized the JavaScript demo code for modularity and clarity without changing behavior.

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This commit is contained in:
Nayuki Minase 2016-04-16 04:06:14 +00:00
parent ee88ce819c
commit de261ca62d
1 changed files with 52 additions and 53 deletions
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105
javascript/qrcodegen-demo.js
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@ -26,18 +26,20 @@
function redrawQrCode() {
// Get error correction level
var ecl;
if (document.getElementById("errcorlvl-medium").checked)
ecl = qrcodegen.QrCode.Ecc.MEDIUM;
else if (document.getElementById("errcorlvl-quartile").checked)
ecl = qrcodegen.QrCode.Ecc.QUARTILE;
else if (document.getElementById("errcorlvl-high").checked)
ecl = qrcodegen.QrCode.Ecc.HIGH;
else // In case no radio button is depressed
ecl = qrcodegen.QrCode.Ecc.LOW;
// Returns a QrCode.Ecc object based on the radio buttons in the HTML form.
function getInputErrorCorrectionLevel() {
if (document.getElementById("errcorlvl-medium").checked)
return qrcodegen.QrCode.Ecc.MEDIUM;
else if (document.getElementById("errcorlvl-quartile").checked)
return qrcodegen.QrCode.Ecc.QUARTILE;
else if (document.getElementById("errcorlvl-high").checked)
return qrcodegen.QrCode.Ecc.HIGH;
else // In case no radio button is depressed
return qrcodegen.QrCode.Ecc.LOW;
}
// Get text and compute QR Code
// Get form inputs and compute QR Code
var ecl = getInputErrorCorrectionLevel();
var text = document.getElementById("text-input").value;
var segs = qrcodegen.QrSegment.makeSegments(text);
var qr = qrcodegen.encodeSegments(segs, ecl);
@ -63,33 +65,48 @@ function redrawQrCode() {
}
}
// Show statistics
// Returns a string to describe the given list of segments.
function describeSegments(segs) {
if (segs.length == 0)
return "none";
else if (segs.length == 1) {
var mode = segs[0].getMode();
var Mode = qrcodegen.QrSegment.Mode;
if (mode == Mode.NUMERIC ) return "numeric";
if (mode == Mode.ALPHANUMERIC) return "alphanumeric";
if (mode == Mode.BYTE ) return "byte";
if (mode == Mode.KANJI ) return "kanji";
return "unknown";
} else
return "multiple";
}
// Returns the number of Unicode code points in the given UTF-16 string.
function countUnicodeChars(str) {
var result = 0;
for (var i = 0; i < str.length; i++, result++) {
var c = str.charCodeAt(i);
if (c < 0xD800 || c >= 0xE000)
continue;
else if (0xD800 <= c && c < 0xDC00) { // High surrogate
i++;
var d = str.charCodeAt(i);
if (0xDC00 <= d && d < 0xE000) // Low surrogate
continue;
}
throw "Invalid UTF-16 string";
}
return result;
}
// Show the QR Code symbol's statistics as a string
var stats = "QR Code version = " + qr.getVersion() + ", ";
stats += "mask pattern = " + qr.getMask() + ", ";
stats += "character count = " + countUnicodeChars(text) + ",\n";
stats += "encoding mode = ";
if (segs.length == 0)
stats += "none";
else if (segs.length == 1) {
var mode = segs[0].getMode();
if (mode == qrcodegen.QrSegment.Mode.NUMERIC)
stats += "numeric";
else if (mode == qrcodegen.QrSegment.Mode.ALPHANUMERIC)
stats += "alphanumeric";
else if (mode == qrcodegen.QrSegment.Mode.BYTE)
stats += "byte";
else if (mode == qrcodegen.QrSegment.Mode.KANJI)
stats += "kanji";
else
stats += "unknown";
} else
stats += "multiple";
stats += ", error correction = level " + "LMQH".charAt(qr.getErrorCorrectionLevel().ordinal) + ", ";
var databits = 0;
segs.forEach(function(seg) {
databits += 4 + seg.getMode().numCharCountBits(qr.getVersion()) + seg.getBits().length;
});
stats += "data bits = " + databits + ".";
stats += "encoding mode = " + describeSegments(segs) + ", ";
stats += "error correction = level " + "LMQH".charAt(qr.getErrorCorrectionLevel().ordinal) + ", ";
stats += "data bits = " + qrcodegen.QrSegment.getTotalBits(segs, qr.getVersion()) + ".";
var elem = document.getElementById("statistics-output");
while (elem.firstChild != null)
elem.removeChild(elem.firstChild);
@ -97,22 +114,4 @@ function redrawQrCode() {
}
function countUnicodeChars(str) {
var result = 0;
for (var i = 0; i < str.length; i++, result++) {
var c = str.charCodeAt(i);
if (c < 0xD800 || c >= 0xE000)
continue;
else if (0xD800 <= c && c < 0xDC00) { // High surrogate
i++;
var d = str.charCodeAt(i);
if (0xDC00 <= d && d < 0xE000) // Low surrogate
continue;
}
throw "Invalid UTF-16 string";
}
return result;
}
redrawQrCode();