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// CodeMirror, copyright (c) by Marijn Haverbeke and others // Distributed under an MIT license: https://codemirror.net/LICENSE (function(mod) { if (typeof exports == "object" && typeof module == "object") // CommonJS mod(require("../../lib/codemirror")); else if (typeof define == "function" && define.amd) // AMD define(["../../lib/codemirror"], mod); else // Plain browser env mod(CodeMirror); })(function(CodeMirror) { CodeMirror.defineOption("placeholder", "", function(cm, val, old) { var prev = old && old != CodeMirror.Init; if (val && !prev) { cm.on("blur", onBlur); cm.on("change", onChange); cm.on("swapDoc", onChange); CodeMirror.on(cm.getInputField(), "compositionupdate", cm.state.placeholderCompose = function() { onComposition(cm) }) onChange(cm); } else if (!val && prev) { cm.off("blur", onBlur); cm.off("change", onChange); cm.off("swapDoc", onChange); CodeMirror.off(cm.getInputField(), "compositionupdate", cm.state.placeholderCompose) clearPlaceholder(cm); var wrapper = cm.getWrapperElement(); wrapper.className = wrapper.className.replace(" CodeMirror-empty", ""); } if (val && !cm.hasFocus()) onBlur(cm); }); function clearPlaceholder(cm) { if (cm.state.placeholder) { cm.state.placeholder.parentNode.removeChild(cm.state.placeholder); cm.state.placeholder = null; } } function setPlaceholder(cm) { clearPlaceholder(cm); var elt = cm.state.placeholder = document.createElement("pre"); elt.style.cssText = "height: 0; overflow: visible"; elt.style.direction = cm.getOption("direction"); elt.className = "CodeMirror-placeholder CodeMirror-line-like"; var placeHolder = cm.getOption("placeholder") if (typeof placeHolder == "string") placeHolder = document.createTextNode(placeHolder) elt.appendChild(placeHolder) cm.display.lineSpace.insertBefore(elt, cm.display.lineSpace.firstChild); } function onComposition(cm) { setTimeout(function() { var empty = false if (cm.lineCount() == 1) { var input = cm.getInputField() empty = input.nodeName == "TEXTAREA" ? !cm.getLine(0).length : !/[^\u200b]/.test(input.querySelector(".CodeMirror-line").textContent) } if (empty) setPlaceholder(cm) else clearPlaceholder(cm) }, 20) } function onBlur(cm) { if (isEmpty(cm)) setPlaceholder(cm); } function onChange(cm) { var wrapper = cm.getWrapperElement(), empty = isEmpty(cm); wrapper.className = wrapper.className.replace(" CodeMirror-empty", "") + (empty ? " CodeMirror-empty" : ""); if (empty) setPlaceholder(cm); else clearPlaceholder(cm); } function isEmpty(cm) { return (cm.lineCount() === 1) && (cm.getLine(0) === ""); } });