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2023-06-22
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/* Copyright 2012 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const { OPS } = globalThis.pdfjsLib || (await import("pdfjs-lib"));
const opMap = Object.create(null);
for (const key in OPS) {
opMap[OPS[key]] = key;
}
const FontInspector = (function FontInspectorClosure() {
let fonts;
let active = false;
const fontAttribute = "data-font-name";
function removeSelection() {
const divs = document.querySelectorAll(`span[${fontAttribute}]`);
for (const div of divs) {
div.className = "";
}
}
function resetSelection() {
const divs = document.querySelectorAll(`span[${fontAttribute}]`);
for (const div of divs) {
div.className = "debuggerHideText";
}
}
function selectFont(fontName, show) {
const divs = document.querySelectorAll(
`span[${fontAttribute}=${fontName}]`
);
for (const div of divs) {
div.className = show ? "debuggerShowText" : "debuggerHideText";
}
}
function textLayerClick(e) {
if (
!e.target.dataset.fontName ||
e.target.tagName.toUpperCase() !== "SPAN"
) {
return;
}
const fontName = e.target.dataset.fontName;
const selects = document.getElementsByTagName("input");
for (const select of selects) {
if (select.dataset.fontName !== fontName) {
continue;
}
select.checked = !select.checked;
selectFont(fontName, select.checked);
select.scrollIntoView();
}
}
return {
// Properties/functions needed by PDFBug.
id: "FontInspector",
name: "Font Inspector",
panel: null,
manager: null,
init() {
const panel = this.panel;
const tmp = document.createElement("button");
tmp.addEventListener("click", resetSelection);
tmp.textContent = "Refresh";
panel.append(tmp);
fonts = document.createElement("div");
panel.append(fonts);
},
cleanup() {
fonts.textContent = "";
},
enabled: false,
get active() {
return active;
},
set active(value) {
active = value;
if (active) {
document.body.addEventListener("click", textLayerClick, true);
resetSelection();
} else {
document.body.removeEventListener("click", textLayerClick, true);
removeSelection();
}
},
// FontInspector specific functions.
fontAdded(fontObj, url) {
function properties(obj, list) {
const moreInfo = document.createElement("table");
for (const entry of list) {
const tr = document.createElement("tr");
const td1 = document.createElement("td");
td1.textContent = entry;
tr.append(td1);
const td2 = document.createElement("td");
td2.textContent = obj[entry].toString();
tr.append(td2);
moreInfo.append(tr);
}
return moreInfo;
}
const moreInfo = properties(fontObj, ["name", "type"]);
const fontName = fontObj.loadedName;
const font = document.createElement("div");
const name = document.createElement("span");
name.textContent = fontName;
const download = document.createElement("a");
if (url) {
url = /url\(['"]?([^)"']+)/.exec(url);
download.href = url[1];
} else if (fontObj.data) {
download.href = URL.createObjectURL(
new Blob([fontObj.data], { type: fontObj.mimetype })
);
}
download.textContent = "Download";
const logIt = document.createElement("a");
logIt.href = "";
logIt.textContent = "Log";
logIt.addEventListener("click", function (event) {
event.preventDefault();
console.log(fontObj);
});
const select = document.createElement("input");
select.setAttribute("type", "checkbox");
select.dataset.fontName = fontName;
select.addEventListener("click", function () {
selectFont(fontName, select.checked);
});
font.append(select, name, " ", download, " ", logIt, moreInfo);
fonts.append(font);
// Somewhat of a hack, should probably add a hook for when the text layer
// is done rendering.
setTimeout(() => {
if (this.active) {
resetSelection();
}
}, 2000);
},
};
})();
// Manages all the page steppers.
const StepperManager = (function StepperManagerClosure() {
let steppers = [];
let stepperDiv = null;
let stepperControls = null;
let stepperChooser = null;
let breakPoints = Object.create(null);
return {
// Properties/functions needed by PDFBug.
id: "Stepper",
name: "Stepper",
panel: null,
manager: null,
init() {
const self = this;
stepperControls = document.createElement("div");
stepperChooser = document.createElement("select");
stepperChooser.addEventListener("change", function (event) {
self.selectStepper(this.value);
});
stepperControls.append(stepperChooser);
stepperDiv = document.createElement("div");
this.panel.append(stepperControls, stepperDiv);
if (sessionStorage.getItem("pdfjsBreakPoints")) {
breakPoints = JSON.parse(sessionStorage.getItem("pdfjsBreakPoints"));
}
},
cleanup() {
stepperChooser.textContent = "";
stepperDiv.textContent = "";
steppers = [];
},
enabled: false,
active: false,
// Stepper specific functions.
create(pageIndex) {
const debug = document.createElement("div");
debug.id = "stepper" + pageIndex;
debug.hidden = true;
debug.className = "stepper";
stepperDiv.append(debug);
const b = document.createElement("option");
b.textContent = "Page " + (pageIndex + 1);
b.value = pageIndex;
stepperChooser.append(b);
const initBreakPoints = breakPoints[pageIndex] || [];
const stepper = new Stepper(debug, pageIndex, initBreakPoints);
steppers.push(stepper);
if (steppers.length === 1) {
this.selectStepper(pageIndex, false);
}
return stepper;
},
selectStepper(pageIndex, selectPanel) {
pageIndex |= 0;
if (selectPanel) {
this.manager.selectPanel(this);
}
for (const stepper of steppers) {
stepper.panel.hidden = stepper.pageIndex !== pageIndex;
}
for (const option of stepperChooser.options) {
option.selected = (option.value | 0) === pageIndex;
}
},
saveBreakPoints(pageIndex, bps) {
breakPoints[pageIndex] = bps;
sessionStorage.setItem("pdfjsBreakPoints", JSON.stringify(breakPoints));
},
};
})();
// The stepper for each page's operatorList.
class Stepper {
// Shorter way to create element and optionally set textContent.
#c(tag, textContent) {
const d = document.createElement(tag);
if (textContent) {
d.textContent = textContent;
}
return d;
}
#simplifyArgs(args) {
if (typeof args === "string") {
const MAX_STRING_LENGTH = 75;
return args.length <= MAX_STRING_LENGTH
? args
: args.substring(0, MAX_STRING_LENGTH) + "...";
}
if (typeof args !== "object" || args === null) {
return args;
}
if ("length" in args) {
// array
const MAX_ITEMS = 10,
simpleArgs = [];
let i, ii;
for (i = 0, ii = Math.min(MAX_ITEMS, args.length); i < ii; i++) {
simpleArgs.push(this.#simplifyArgs(args[i]));
}
if (i < args.length) {
simpleArgs.push("...");
}
return simpleArgs;
}
const simpleObj = {};
for (const key in args) {
simpleObj[key] = this.#simplifyArgs(args[key]);
}
return simpleObj;
}
constructor(panel, pageIndex, initialBreakPoints) {
this.panel = panel;
this.breakPoint = 0;
this.nextBreakPoint = null;
this.pageIndex = pageIndex;
this.breakPoints = initialBreakPoints;
this.currentIdx = -1;
this.operatorListIdx = 0;
this.indentLevel = 0;
}
init(operatorList) {
const panel = this.panel;
const content = this.#c("div", "c=continue, s=step");
const table = this.#c("table");
content.append(table);
table.cellSpacing = 0;
const headerRow = this.#c("tr");
table.append(headerRow);
headerRow.append(
this.#c("th", "Break"),
this.#c("th", "Idx"),
this.#c("th", "fn"),
this.#c("th", "args")
);
panel.append(content);
this.table = table;
this.updateOperatorList(operatorList);
}
updateOperatorList(operatorList) {
const self = this;
function cboxOnClick() {
const x = +this.dataset.idx;
if (this.checked) {
self.breakPoints.push(x);
} else {
self.breakPoints.splice(self.breakPoints.indexOf(x), 1);
}
StepperManager.saveBreakPoints(self.pageIndex, self.breakPoints);
}
const MAX_OPERATORS_COUNT = 15000;
if (this.operatorListIdx > MAX_OPERATORS_COUNT) {
return;
}
const chunk = document.createDocumentFragment();
const operatorsToDisplay = Math.min(
MAX_OPERATORS_COUNT,
operatorList.fnArray.length
);
for (let i = this.operatorListIdx; i < operatorsToDisplay; i++) {
const line = this.#c("tr");
line.className = "line";
line.dataset.idx = i;
chunk.append(line);
const checked = this.breakPoints.includes(i);
const args = operatorList.argsArray[i] || [];
const breakCell = this.#c("td");
const cbox = this.#c("input");
cbox.type = "checkbox";
cbox.className = "points";
cbox.checked = checked;
cbox.dataset.idx = i;
cbox.onclick = cboxOnClick;
breakCell.append(cbox);
line.append(breakCell, this.#c("td", i.toString()));
const fn = opMap[operatorList.fnArray[i]];
let decArgs = args;
if (fn === "showText") {
const glyphs = args[0];
const charCodeRow = this.#c("tr");
const fontCharRow = this.#c("tr");
const unicodeRow = this.#c("tr");
for (const glyph of glyphs) {
if (typeof glyph === "object" && glyph !== null) {
charCodeRow.append(this.#c("td", glyph.originalCharCode));
fontCharRow.append(this.#c("td", glyph.fontChar));
unicodeRow.append(this.#c("td", glyph.unicode));
} else {
// null or number
const advanceEl = this.#c("td", glyph);
advanceEl.classList.add("advance");
charCodeRow.append(advanceEl);
fontCharRow.append(this.#c("td"));
unicodeRow.append(this.#c("td"));
}
}
decArgs = this.#c("td");
const table = this.#c("table");
table.classList.add("showText");
decArgs.append(table);
table.append(charCodeRow, fontCharRow, unicodeRow);
} else if (fn === "restore" && this.indentLevel > 0) {
this.indentLevel--;
}
line.append(this.#c("td", " ".repeat(this.indentLevel * 2) + fn));
if (fn === "save") {
this.indentLevel++;
}
if (decArgs instanceof HTMLElement) {
line.append(decArgs);
} else {
line.append(this.#c("td", JSON.stringify(this.#simplifyArgs(decArgs))));
}
}
if (operatorsToDisplay < operatorList.fnArray.length) {
const lastCell = this.#c("td", "...");
lastCell.colspan = 4;
chunk.append(lastCell);
}
this.operatorListIdx = operatorList.fnArray.length;
this.table.append(chunk);
}
getNextBreakPoint() {
this.breakPoints.sort(function (a, b) {
return a - b;
});
for (const breakPoint of this.breakPoints) {
if (breakPoint > this.currentIdx) {
return breakPoint;
}
}
return null;
}
breakIt(idx, callback) {
StepperManager.selectStepper(this.pageIndex, true);
this.currentIdx = idx;
const listener = evt => {
switch (evt.keyCode) {
case 83: // step
document.removeEventListener("keydown", listener);
this.nextBreakPoint = this.currentIdx + 1;
this.goTo(-1);
callback();
break;
case 67: // continue
document.removeEventListener("keydown", listener);
this.nextBreakPoint = this.getNextBreakPoint();
this.goTo(-1);
callback();
break;
}
};
document.addEventListener("keydown", listener);
this.goTo(idx);
}
goTo(idx) {
const allRows = this.panel.getElementsByClassName("line");
for (const row of allRows) {
if ((row.dataset.idx | 0) === idx) {
row.style.backgroundColor = "rgb(251,250,207)";
row.scrollIntoView();
} else {
row.style.backgroundColor = null;
}
}
}
}
const Stats = (function Stats() {
let stats = [];
function clear(node) {
node.textContent = ""; // Remove any `node` contents from the DOM.
}
function getStatIndex(pageNumber) {
for (const [i, stat] of stats.entries()) {
if (stat.pageNumber === pageNumber) {
return i;
}
}
return false;
}
return {
// Properties/functions needed by PDFBug.
id: "Stats",
name: "Stats",
panel: null,
manager: null,
init() {},
enabled: false,
active: false,
// Stats specific functions.
add(pageNumber, stat) {
if (!stat) {
return;
}
const statsIndex = getStatIndex(pageNumber);
if (statsIndex !== false) {
stats[statsIndex].div.remove();
stats.splice(statsIndex, 1);
}
const wrapper = document.createElement("div");
wrapper.className = "stats";
const title = document.createElement("div");
title.className = "title";
title.textContent = "Page: " + pageNumber;
const statsDiv = document.createElement("div");
statsDiv.textContent = stat.toString();
wrapper.append(title, statsDiv);
stats.push({ pageNumber, div: wrapper });
stats.sort(function (a, b) {
return a.pageNumber - b.pageNumber;
});
clear(this.panel);
for (const entry of stats) {
this.panel.append(entry.div);
}
},
cleanup() {
stats = [];
clear(this.panel);
},
};
})();
// Manages all the debugging tools.
class PDFBug {
static #buttons = [];
static #activePanel = null;
static tools = [FontInspector, StepperManager, Stats];
static enable(ids) {
const all = ids.length === 1 && ids[0] === "all";
const tools = this.tools;
for (const tool of tools) {
if (all || ids.includes(tool.id)) {
tool.enabled = true;
}
}
if (!all) {
// Sort the tools by the order they are enabled.
tools.sort(function (a, b) {
let indexA = ids.indexOf(a.id);
indexA = indexA < 0 ? tools.length : indexA;
let indexB = ids.indexOf(b.id);
indexB = indexB < 0 ? tools.length : indexB;
return indexA - indexB;
});
}
}
static init(container, ids) {
this.loadCSS();
this.enable(ids);
/*
* Basic Layout:
* PDFBug
* Controls
* Panels
* Panel
* Panel
* ...
*/
const ui = document.createElement("div");
ui.id = "PDFBug";
const controls = document.createElement("div");
controls.setAttribute("class", "controls");
ui.append(controls);
const panels = document.createElement("div");
panels.setAttribute("class", "panels");
ui.append(panels);
container.append(ui);
container.style.right = "var(--panel-width)";
// Initialize all the debugging tools.
for (const tool of this.tools) {
const panel = document.createElement("div");
const panelButton = document.createElement("button");
panelButton.textContent = tool.name;
panelButton.addEventListener("click", event => {
event.preventDefault();
this.selectPanel(tool);
});
controls.append(panelButton);
panels.append(panel);
tool.panel = panel;
tool.manager = this;
if (tool.enabled) {
tool.init();
} else {
panel.textContent =
`${tool.name} is disabled. To enable add "${tool.id}" to ` +
"the pdfBug parameter and refresh (separate multiple by commas).";
}
this.#buttons.push(panelButton);
}
this.selectPanel(0);
}
static loadCSS() {
const { url } = import.meta;
const link = document.createElement("link");
link.rel = "stylesheet";
link.href = url.replace(/.js$/, ".css");
document.head.append(link);
}
static cleanup() {
for (const tool of this.tools) {
if (tool.enabled) {
tool.cleanup();
}
}
}
static selectPanel(index) {
if (typeof index !== "number") {
index = this.tools.indexOf(index);
}
if (index === this.#activePanel) {
return;
}
this.#activePanel = index;
for (const [j, tool] of this.tools.entries()) {
const isActive = j === index;
this.#buttons[j].classList.toggle("active", isActive);
tool.active = isActive;
tool.panel.hidden = !isActive;
}
}
}
globalThis.FontInspector = FontInspector;
globalThis.StepperManager = StepperManager;
globalThis.Stats = Stats;
export { PDFBug };