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function calculateTagHue(input) {
var out = 0;
for (var i = 0; i < input.length; i++)
out ^= input.charCodeAt(i);
return Math.floor((out * 12) % 360);
}
HTMLElement.prototype.parse = function() {
if (this.classList.contains("parsed")) return; // ignore already parsed elements
var input = this.innerHTML;
var bold = false; // currently bold
var italic = false; // currently italic
var mode = "normal"; // normal, kanji, reading
var out = ""; // output html
var note_head = 0;
var note_tail = 0;
var alwaysvisisble = false; // if furigana is always visible (on front of card)
var kanji = ""; // current kanji
var reading = ""; // current kanji reading
for (var i = 0; i < input.length; i++) {
if (this.classList.contains("parse-format")) {
// escape characters preceded by \
if (input[i] == "\\") {
var escaped = input[i+1];
if (escaped == "n") escaped = "<br>"; // newline
if (escaped == "t") escaped = "\t"; // tab
out += escaped; i++; continue;
}
// parse *test* into <b>test</b>
if (input[i] == "*") { bold = !bold; out += `<${bold ? "" : "/"}b>`; continue; }
// parse _test_ into <i>test</i>
if (input[i] == "_") { italic = !italic; out += `<${italic ? "" : "/"}i>`; continue; }
}
if (this.classList.contains("parse-furigana")) {
// parse [kanji](reading) into ruby text
// [kanji](reading) is only visible on card back
// {kanji}(reading) is always visible
if (mode == "normal" && input[i] == "[") // hidden reading kanji open
{ kanji = ""; mode = "kanji"; alwaysvisisble = false; continue; }
if (mode == "normal" && input[i] == "{") // always visible reading kanji open
{ kanji = ""; mode = "kanji"; alwaysvisisble = true; continue; }
if (mode == "kanji" && input[i] == "]") continue; // hidden reading kanji close
if (mode == "kanji" && input[i] == "}") continue; // always visible reading kanji close
if (mode == "kanji" && kanji.length > 0 && input[i] == "(") // reading open
{ reading = ""; mode = "reading"; continue; }
if (mode == "reading" && input[i] == ")") { // reading close
mode = "normal";
out += `<ruby>${kanji}<rt class="${alwaysvisisble ? 'visible' : 'hidden'}">${reading}</rt></ruby>`;
continue;
}
}
if (this.classList.contains("parse-brackets")) {
if (i == 0) {
// start kanji reading
out += `<span class="kanji">`;
var match = input.match(/\((.+?)\)/);
// display "(note)" before kanji
if (match) {
out += `<span class="note">${match[1]}</span>`;
note_head = match.index;
note_tail = note_head + match[0].length;
}
}
// ignore note if parsed
else if (i == note_head) { i = note_tail - 1; continue; }
// reading open bracket
if (input[i] == '\u3010') { out += `</span><span class="reading"><span class="bracket">${input[i]}</span><span class="syllable">`; continue; }
// reading closing bracket
if (input[i] == '\u3011') { out += `</span><span class="bracket">${input[i]}</span></span>`; continue; }
// interpunct (syllable separator)
if (input[i] == '\u30fb') { out += `</span><span class="syllable-separator">${input[i]}</span><span class="syllable">`; continue; }
}
if (this.classList.contains("parse-tags")) {
for (var tag of input.split(" "))
out += `<span class="tag" style="--tag-hue: ${calculateTagHue(tag)};"><span class="inner">${tag}</span></span>`;
break;
}
// add current character to selected mode buffer
if (mode == "normal") out += input[i];
if (mode == "kanji") kanji += input[i];
if (mode == "reading") reading += input[i];
}
this.innerHTML = out;
this.classList.add("parsed");
if (input.length == 0) this.classList.add("empty");
};
function layout() {
// set vertical layout on vertical displays (primarily mobile screens)
var el = document.getElementById("card");
if (screen.orientation.type.startsWith("landscape") && el.classList.contains("vertical-layout")) {
el.classList.remove("vertical-layout");
el.classList.add("horizontal-layout");
} else if (screen.orientation.type.startsWith("portrait") && el.classList.contains("horizontal-layout")) {
el.classList.remove("horizontal-layout");
el.classList.add("vertical-layout");
}
}
function run() {
for (var el of document.getElementsByClassName("parse")) el.parse();
// toggle spoiler by clicking
for (var el of document.getElementsByClassName("spoiler")) {
el.onclick = function () {
this.classList.toggle("hidden");
this.classList.toggle("visible");
};
}
// remove spoiler from sentence translation if word reading field is empty
if(document.getElementById("target-word-reading").classList.contains("empty")) {
document.getElementById("sentence-translation").classList.remove("hidden");
}
layout();
}
run();
window.onload = () => run();
window.onresize = () => layout();
window.ondeviceorientation = () => layout();
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