From d103dc05747cca52f0e229d40876ac0c8d2b41e3 Mon Sep 17 00:00:00 2001
From: David Evans <davidje13@users.noreply.github.com>
Date: Mon, 20 Jan 2020 21:30:23 +0000
Subject: [PATCH] Improve behaviour when adding formatting elements from
 library

---
 web/lib/editor.js                           | 82 ++++++++++++++++++---
 web/lib/editor.min.js                       |  2 +-
 web/scripts/interface/CodeEditor.mjs        | 67 ++++++++++++++---
 web/scripts/interface/ComponentsLibrary.mjs | 10 +++
 web/scripts/interface/Interface.mjs         |  5 +-
 5 files changed, 143 insertions(+), 23 deletions(-)

diff --git a/web/lib/editor.js b/web/lib/editor.js
index 586796a..6bdf17a 100644
--- a/web/lib/editor.js
+++ b/web/lib/editor.js
@@ -253,51 +253,61 @@
 		{
 			code: '**{text}**',
 			preview: 'A -> B: **bold**',
+			surround: true,
 			title: 'Bold markdown',
 		},
 		{
 			code: '_{text}_',
 			preview: 'A -> B: _italic_',
+			surround: true,
 			title: 'Italic markdown',
 		},
 		{
 			code: '~{text}~',
 			preview: 'A -> B: ~strikeout~',
+			surround: true,
 			title: 'Strikeout markdown',
 		},
 		{
 			code: '<u>{text}</u>',
 			preview: 'A -> B: <u>underline</u>',
+			surround: true,
 			title: 'Underline markdown',
 		},
 		{
 			code: '<o>{text}</o>',
 			preview: 'A -> B: <o>overline</o>',
+			surround: true,
 			title: 'Overline markdown',
 		},
 		{
 			code: '<sup>{text}</sup>',
 			preview: 'A -> B: super<sup>script</sup>',
+			surround: true,
 			title: 'Superscript markdown',
 		},
 		{
 			code: '<sub>{text}</sub>',
 			preview: 'A -> B: sub<sub>script</sub>',
+			surround: true,
 			title: 'Subscript markdown',
 		},
 		{
 			code: '`{text}`',
 			preview: 'A -> B: `mono`',
+			surround: true,
 			title: 'Monospace markdown',
 		},
 		{
 			code: '<red>{text}</red>',
 			preview: 'A -> B: <red>red</red>',
+			surround: true,
 			title: 'Red markdown',
 		},
 		{
 			code: '<highlight>{text}</highlight>',
 			preview: 'A -> B: <highlight>highlight</highlight>',
+			surround: true,
 			title: 'Highlight markdown',
 		},
 		{
@@ -870,6 +880,15 @@
 		return null;
 	}
 
+	function lineWithinRange(doc, ln, start, end) {
+		const full = doc.getLine(ln);
+		const begin = (ln === start.line) ? start.ch : 0;
+		return {
+			chOffset: begin,
+			line: (ln === end.line) ? full.slice(begin, end.ch) : full.slice(begin),
+		};
+	}
+
 	class CodeEditor extends EventObject {
 		constructor(dom, container, {
 			mode = '',
@@ -974,8 +993,8 @@
 				this.code.off('cursorActivity', move);
 				this.paramMarkers.forEach((m) => m.clear());
 				this.paramMarkers = null;
+				this.code.setCursor(endBookmark.find());
 				endBookmark.clear();
-				this.code.setCursor(end);
 				this.cancelParams = null;
 				this.advanceParams = null;
 			};
@@ -1001,12 +1020,12 @@
 
 			const doc = this.code.getDoc();
 			const ranges = [];
-			let {ch} = start;
-			for(let ln = start.line; ln < endBookmark.find().line; ++ ln) {
-				const line = doc.getLine(ln).slice(ch);
+			const end = endBookmark.find();
+			for(let ln = start.line; ln <= end.line; ++ ln) {
+				const {chOffset, line} = lineWithinRange(doc, ln, start, end);
 				for(let p = 0; (p = line.indexOf(tok, p)) !== -1; p += tok.length) {
-					const anchor = {ch: p, line: ln};
-					const head = {ch: p + tok.length, line: ln};
+					const anchor = {ch: chOffset + p, line: ln};
+					const head = {ch: chOffset + p + tok.length, line: ln};
 					ranges.push({anchor, head});
 					this.paramMarkers.push(doc.markText(anchor, head, {
 						className: 'param',
@@ -1015,7 +1034,6 @@
 						inclusiveRight: true,
 					}));
 				}
-				ch = 0;
 			}
 
 			if(ranges.length > 0) {
@@ -1025,11 +1043,39 @@
 			}
 		}
 
-		addCodeBlock(block) {
-			const lines = block.split('\n').length;
+		hasSelection() {
+			const from = this.code.getCursor('from');
+			const to = this.code.getCursor('to');
+			return from.line !== to.line || from.ch !== to.ch;
+		}
 
-			this.code.focus();
+		internalAddSurroundCode(block) {
+			if(this.enhanced) {
+				if(this.hasSelection()) {
+					this.code.replaceSelection(
+						block.replace(/\{.*\}/, this.code.getSelection()),
+						'end',
+						'library'
+					);
+				} else {
+					const cur = this.code.getCursor('head');
+					this.code.replaceSelection(block, null, 'library');
+					const end = {ch: cur.ch + block.length, line: cur.line};
+					this.enterParams(cur, end, block);
+				}
+			} else {
+				const value = this.value();
+				const s1 = this.code.element.selectionStart;
+				const s2 = this.code.element.selectionEnd;
+				const wrapped = block.replace(/\{.*\}/, value.substring(s1, s2));
+				this.code
+					.val(value.substr(0, s1) + wrapped + value.substr(s2))
+					.select(s1 + wrapped.length);
+				this.trigger('change');
+			}
+		}
 
+		internalAddIndependentCode(block) {
 			if(this.enhanced) {
 				const cur = this.code.getCursor('head');
 				const pos = {ch: 0, line: cur.line + ((cur.ch > 0) ? 1 : 0)};
@@ -1038,6 +1084,7 @@
 					replaced = '\n' + replaced;
 				}
 				this.code.replaceRange(replaced, pos, null, 'library');
+				const lines = block.split('\n').length;
 				const end = {ch: 0, line: pos.line + lines};
 				this.enterParams(pos, end, block);
 			} else {
@@ -1055,6 +1102,16 @@
 			}
 		}
 
+		addCodeBlock(block, surround = false) {
+			this.code.focus();
+
+			if(surround) {
+				this.internalAddSurroundCode(block);
+			} else {
+				this.internalAddIndependentCode(block);
+			}
+		}
+
 		value() {
 			if(this.enhanced) {
 				return this.code.getDoc().getValue();
@@ -1645,7 +1702,10 @@
 					.setClass('library-item')
 					.add(holdInner)
 					.fastClick()
-					.on('click', () => this.code.addCodeBlock(lib.code))
+					.on('click', () => this.code.addCodeBlock(
+						lib.code,
+						lib.surround
+					))
 					.attach(container);
 
 				return this.diagram.clone({
diff --git a/web/lib/editor.min.js b/web/lib/editor.min.js
index 75306bf..cfbefa3 100644
--- a/web/lib/editor.min.js
+++ b/web/lib/editor.min.js
@@ -1 +1 @@
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class{constructor({sequenceDiagram:e,defaultCode:t="",library:i=[],links:n=[],require:s=null,storage:r=new w,touchUI:o=!1}){this.diagram=e,this.defaultCode=t,this.storage=r,this.library=i,this.links=n,this.minScale=1.5,this.require=s||(()=>null),this.touchUI=o,this.debounced=null,this.latestSeq=null,this.renderedSeq=null,this.pngDirty=!0,this.updatingPNG=!1,this.marker=null,this._downloadSVGClick=this._downloadSVGClick.bind(this),this._downloadPNGClick=this._downloadPNGClick.bind(this),this._downloadPNGFocus=this._downloadPNGFocus.bind(this),this._downloadURLClick=this._downloadURLClick.bind(this),this._hideDropStyle=this._hideDropStyle.bind(this),this.diagram.on("render",()=>{this.updateMinSize(this.diagram.getSize()),function(e){let t=e.trim();t.length>20&&(t=t.substr(0,18).trim()+"…"),document.title=(t?`${t} — `:"")+"Sequence Diagram"}(this.diagram.getTitle()),this.pngDirty=!0}).on("mouseover",e=>this.code.markLineHover(e.ln)).on("mouseout",()=>this.code.unmarkLineHover()).on("click",e=>{this.code.unmarkLineHover(),this.code.selectLine(e.ln),this._hideURLBuilder()}).on("dblclick",e=>{this.diagram.toggleCollapsed(e.ln),this._hideURLBuilder()})}buildURLBuilder(){const e=this.dom.el("div").setClass("copied").add("Copied to Clipboard");this.urlOutput=this.dom.el("input").setClass("output").attr("readonly","readonly").on("focus",()=>{this.urlOutput.select(0,this.urlOutput.element.value.length)});const t=this.dom.el("button").setClass("copy").attr("title","Copy to clipboard").fastClick().on("click",()=>{this.touchUI&&this.urlOutput.styles({display:"block"}),this.urlOutput.focus().select(0,this.urlOutput.element.value.length).element.ownerDocument.execCommand("copy"),t.focus(),this.container.delClass("keyinput"),this.touchUI&&this.urlOutput.styles({display:"none"}),e.styles({display:"block",opacity:1,transition:"none"}),setTimeout(()=>e.styles({opacity:0,transition:"opacity 0.5s linear"}),1e3),setTimeout(()=>e.styles({display:"none"}),1500)}),i=()=>{this.renderOpts.styles({display:this.modeEdit.element.checked?"none":"block"}),this._refreshURL()};this.modeRender=this.dom.el("input").attrs({checked:"checked",name:"export-mode",type:"radio",value:"render"}).on("change",i),this.modeEdit=this.dom.el("input").attrs({name:"export-mode",type:"radio",value:"edit"}).on("change",i),this.modeMarkdown=this.dom.el("input").attrs({name:"export-mode",type:"radio",value:"markdown"}).on("change",i),this.urlWidth=this.dom.el("input").attrs({min:0,placeholder:"auto",step:"any",type:"number"}).on("input",()=>{this.urlZoom.val("1"),this._refreshURL()}),this.urlHeight=this.dom.el("input").attrs({min:0,placeholder:"auto",step:"any",type:"number"}).on("input",()=>{this.urlZoom.val("1"),this._refreshURL()}),this.urlZoom=this.dom.el("input").attrs({min:0,step:"any",type:"number",value:1}).on("input",()=>{this.urlWidth.val(""),this.urlHeight.val(""),this._refreshURL()}),this.renderOpts=this.dom.el("div").add(this.dom.el("label").add("width ",this.urlWidth),", ",this.dom.el("label").add("height ",this.urlHeight),this.dom.el("span").setClass("or").add("or"),this.dom.el("label").add("zoom ",this.urlZoom));const n=this.dom.el("div").setClass("config").add(this.dom.el("div").setClass("export-mode").add(this.dom.el("label").add(this.modeRender,"View"),this.dom.el("label").add(this.modeEdit,"Edit"),this.dom.el("label").add(this.modeMarkdown,"Markdown")),this.renderOpts,this.urlOutput,t,e),s=this.dom.el("div").setClass("urlbuilder").styles({display:"none"}).add(this.dom.el("div").setClass("message").add("Loading…")),r="undefined"==typeof window?"http://localhost":window.location.href;return this.renderService=new p,this.renderService.setEditBase(new URL(".",r).href),function(e){return"undefined"==typeof fetch?Promise.reject(new Error):fetch(e).then(e=>{if(!e.ok)throw new Error(e.statusText);return e})}("render/").then(e=>e.text()).then(e=>{let t=e.trim();t&&!t.startsWith("<")||(t="render/"),this.renderService.setRenderBase(new URL(t,r).href),s.empty().add(n),this._refreshURL()}).catch(()=>{s.empty().add(this.dom.el("div").setClass("message").add("No online rendering service available."))}),s}_refreshURL(){const e=this.code.value(),t={height:Number.parseFloat(this.urlHeight.element.value),width:Number.parseFloat(this.urlWidth.element.value),zoom:Number.parseFloat(this.urlZoom.element.value||"1")};let i="";if(this.modeMarkdown.element.checked){const n=this.renderService.getEditURL(e),s=this.renderService.getRenderURL(e,t);i=`[![${this.diagram.getTitle().replace(/[^a-zA-Z0-9 \-_'"]/g,"").trim()}](${s})](${n})`}else i=this.modeEdit.element.checked?this.renderService.getEditURL(e):this.renderService.getRenderURL(e,t);this.urlOutput.val(i)}_showURLBuilder(){this.builderVisible||(this.builderVisible=!0,this.touchUI?this.urlBuilder.styles({bottom:"-210px",display:"block"}):this.urlBuilder.styles({display:"block",height:"0px",padding:"0px",width:this.optsHold.element.clientWidth+"px"}),clearTimeout(this.builderTm),this.builderTm=setTimeout(()=>{this.touchUI?this.urlBuilder.styles({bottom:0}):(this.urlBuilder.styles({height:"150px",padding:"10px",width:"400px"}),this.optsHold.styles({"box-shadow":"10px 10px 25px 12px rgba(0,0,0,0.3)"}))},0),this._refreshURL())}_hideURLBuilder(){this.builderVisible&&(this.builderVisible=!1,this.touchUI?this.urlBuilder.styles({bottom:-this.urlBuilder.element.clientHeight-60+"px"}):(this.urlBuilder.styles({height:"0px",padding:"0px",width:"0px"}),this.optsHold.styles({"box-shadow":"none"})),this.container.delClass("keyinput"),clearTimeout(this.builderTm),this.builderTm=setTimeout(()=>{this.urlBuilder.styles({display:"none"})},200))}buildOptionsDownloads(){return this.downloadPNG=this.dom.el("a").text("Export PNG").attrs({download:"SequenceDiagram.png",href:"#"}).on(["focus","mouseover","mousedown"],this._downloadPNGFocus).on("touchend",this._downloadPNGFocus).on("click",this._downloadPNGClick),this.downloadSVG=this.dom.el("a").text("SVG").attrs({download:"SequenceDiagram.svg",href:"#"}).fastClick().on("click",this._downloadSVGClick),this.downloadURL=this.dom.el("a").text("URL").attrs({href:"#"}).fastClick().on("click",this._downloadURLClick),this.urlBuilder=this.buildURLBuilder(),this.optsHold=this.dom.el("div").setClass("options downloads").add(this.downloadPNG,this.downloadSVG,this.downloadURL,this.urlBuilder),this.optsHold}buildLibrary(e){const t=this.library.map(t=>{const i=this.dom.el("div").attr("title",t.title||t.code),n=this.dom.el("div").setClass("library-item").add(i).fastClick().on("click",()=>this.code.addCodeBlock(t.code,t.surround)).attach(e);return this.diagram.clone({code:function(e){return"headers fade\nterminators fade\n"+e.replace(/\{Agent([0-9]*)\}/g,(e,t)=>void 0===t?"A":String.fromCharCode("A".charCodeAt(0)+Number(t)-1)).replace(/[{}]/g,"")}(t.preview||t.code),container:i.element,render:!1}).on("error",(e,s)=>{window.console.warn("Failed to render preview",s),n.attr("class","library-item broken"),i.text(t.code)})});try{this.diagram.renderAll(t)}catch(e){}return e}buildCodePane(){const e=this.dom.el("div").setClass("pane-code");return this.code=new g(this.dom,e,{mode:"sequence",require:this.require,value:this.storage.get()||this.defaultCode}),this.code.on("enhance",(e,t)=>{this.diagram.registerCodeMirrorMode(e),t.themes=this.diagram.getThemeNames()}).on("change",()=>this.update(!1)).on("cursorActivity",(e,t)=>{this.diagram.setHighlight(Math.min(e.line,t.line))}).on("focus",()=>this._hideURLBuilder()),e}buildLibPane(){return 0===this.library.length?null:this.dom.el("div").setClass("pane-library").add(this.dom.el("div").setClass("pane-library-scroller").add(this.buildLibrary(this.dom.el("div").setClass("pane-library-inner"))))}buildViewPane(){return this.viewPaneInner=this.dom.el("div").setClass("pane-view-inner").add(this.diagram.dom()).on("touchstart",()=>this._hideURLBuilder(),{passive:!0}).on("mousedown",()=>this._hideURLBuilder()),this.errorMsg=this.dom.el("div").setClass("msg-error"),this.dom.el("div").setClass("pane-view").add(this.dom.el("div").setClass("pane-view-scroller").add(this.viewPaneInner),this.errorMsg)}build(e){this.dom=new c(e.ownerDocument),this.container=this.dom.wrap(e).on("dragover",e=>{e.preventDefault(),function(e,t){if(!e.dataTransfer.items&&0===e.dataTransfer.files.length)return[...e.dataTransfer.types].includes("Files");const i=e.dataTransfer.items||e.dataTransfer.files;return 1===i.length&&i[0].type===t}(e,"image/svg+xml")?(e.dataTransfer.dropEffect="copy",this._showDropStyle()):e.dataTransfer.dropEffect="none"}).on("dragleave",this._hideDropStyle).on("dragend",this._hideDropStyle).on("drop",e=>{e.preventDefault(),this._hideDropStyle();const t=function(e,t){const i=e.dataTransfer.items||e.dataTransfer.files;if(1!==i.length||i[0].type!==t)return null;const[n]=i;return n.getAsFile?n.getAsFile():n}(e,"image/svg+xml");t&&this.loadFile(t)}).on("focusin",()=>this.container.addClass("keyinput")).on("focusout",()=>this.container.delClass("keyinput"));const t=this.buildCodePane(),i=this.buildLibPane(),n=this.buildViewPane(),s=this.links.map(e=>this.dom.el("a").attrs({href:e.href,target:"_blank"}).text(this.touchUI?e.touchLabel:e.label));this.touchUI?(this.buildOptionsDownloads(),this.container.addClass("touch").add(this.dom.el("div").setClass("pane-hold").split([n,t],{direction:"vertical",minSize:[10,10],require:this.require,sizes:[80,20],snapOffset:20}),i.styles({display:"none",top:"100%"}),this.urlBuilder,this.dom.el("div").setClass("optbar").add(...s,this.downloadPNG.text("PNG"),this.downloadSVG.text("SVG"),this.downloadURL.text("URL")))):this.container.add(this.dom.el("div").setClass("pane-hold").split([this.dom.el("div").setClass("pane-side").split([t,i],{direction:"vertical",minSize:[100,5],require:this.require,sizes:[70,30],snapOffset:5}),n],{direction:"horizontal",minSize:[10,10],require:this.require,sizes:[30,70],snapOffset:70}),this.dom.el("div").setClass("options links").add(s),this.buildOptionsDownloads()),"undefined"!=typeof window&&window.addEventListener("keydown",e=>{27===e.keyCode&&this._hideURLBuilder()}),setTimeout(this.update.bind(this),0)}updateMinSize({width:e,height:t}){this.viewPaneInner.styles({minHeight:Math.ceil(t*this.minScale)+"px",minWidth:Math.ceil(e*this.minScale)+"px"})}redrawDebounced(e,t){t<=0?this.redraw(e):(clearTimeout(this.debounced),this.latestSeq=e,this.debounced=setTimeout(()=>this.redraw(e),t))}redraw(e){clearTimeout(this.debounced),this.debounced=null,this.renderedSeq=e,this.diagram.render(e)}markError(e){"object"==typeof e&&e.message?this.errorMsg.text(e.message):this.errorMsg.text(e),this.errorMsg.addClass("error")}markOK(){this.errorMsg.text("").delClass("error")}loadFile(e){return function(e){return new Promise(t=>{const i=new FileReader;i.addEventListener("loadend",()=>{t(i.result)},{once:!0}),i.readAsText(e)})}(e).then(e=>{const t=this.diagram.extractCodeFromSVG(e);t&&(this.code.setValue(t),this.diagram.expandAll({render:!1}),this.update(!0),this.diagram.setHighlight(null))})}update(e=!0){this._hideURLBuilder();const t=this.code.value();this.storage.set(t);let i=null;try{i=this.diagram.process(t)}catch(e){return void this.markError(e)}this.markOK();let n=0;if(!e&&this.renderedSeq){const e=this.renderedSeq;i.agents.length!==e.agents.length?n=v:i.stages.length!==e.stages.length&&(n=f)}this.redrawDebounced(i,n)}forceRender(){this.debounced&&(clearTimeout(this.debounced),this.redraw(this.latestSeq))}updatePNGLink(){return this.forceRender(),!(this.updatingPNG||!this.pngDirty||(this.pngDirty=!1,this.updatingPNG=!0,this.diagram.getPNG({resolution:b}).then(({url:e,latest:t})=>{t&&(this.downloadPNG.attr("href",e),this.updatingPNG=!1)}),0))}_showDropStyle(){this.container.addClass("drop-target")}_hideDropStyle(){this.container.delClass("drop-target")}_downloadPNGFocus(){this.updatePNGLink()}_downloadPNGClick(e){this.updatingPNG?e.preventDefault():this.updatePNGLink()&&e.preventDefault(),this._hideURLBuilder()}_downloadSVGClick(){this.forceRender();const e=this.diagram.getSVGSynchronous();this.downloadSVG.attr("href",e),this._hideURLBuilder()}_downloadURLClick(e){e.preventDefault(),this.builderVisible?this._hideURLBuilder():this._showURLBuilder()}}({defaultCode:'title Labyrinth\n\nBowie -> Goblin: You remind me of the babe\nGoblin -> Bowie: What babe?\nBowie -> Goblin: The babe with the power\nGoblin -> Bowie: What power?\nnote right of Bowie, Goblin: Most people get muddled here!\nBowie -> Goblin: "The power of voodoo"\nGoblin -> Bowie: "Who-do?"\nBowie -> Goblin: You do!\nGoblin -> Bowie: Do what?\nBowie -> Goblin: Remind me of the babe!\n\nBowie -> Audience: Sings\n\nterminators box\n',library:a,links:s,require:C,sequenceDiagram:new A,storage:new class{constructor(e,t){this.slotManager=e,this.slotStorage=t,this.slot=this.slotManager.getSlot(),this.value=this.get(),this.originalValue=this.value,this.loadTime=Date.now(),this.internalStorageListener=this.internalStorageListener.bind(this),window.addEventListener("storage",this.internalStorageListener),this.checkSlot()}getCurrentValue(){return Date.now()<this.loadTime+500?this.originalValue:this.value}key(){return this.slotStorage.getSlotKey(this.slot)}checkSlot(){const e=this.key();window.localStorage.removeItem(`chk-${e}`),window.localStorage.removeItem(`res-${e}`),window.localStorage.removeItem(`ack-${e}`),window.localStorage.setItem(`chk-${e}`,"1")}cloneSlot(){const e=this.slotManager.maxSlots(),t=this.slotStorage.nextAvailableSlot(e);if(!t)return;const i=this.getCurrentValue();this.slotStorage.set(t,i),this.slot=t,this.slotManager.setSlot(t),i!==this.value&&document.location.reload()}internalStorageListener({storageArea:e,key:t,newValue:i}){if(e!==window.localStorage)return;const n=this.key();t===n&&i!==this.value&&(null===i&&window.localStorage.setItem(n,this.value),window.localStorage.removeItem(`res-${n}`),window.localStorage.setItem(`res-${n}`,"1")),t===`chk-${n}`&&i&&window.localStorage.setItem(`res-${n}`,"1"),t===`res-${n}`&&i&&(window.localStorage.removeItem(`chk-${n}`),window.localStorage.removeItem(`res-${n}`),window.localStorage.setItem(`ack-${n}`,"1"),this.cloneSlot()),t===`ack-${n}`&&i&&(window.localStorage.removeItem(`ack-${n}`,"1"),window.localStorage.setItem(n,this.value))}set(e){this.value=e,this.slotStorage.set(this.slot,e)}get(){return this.slotStorage.get(this.slot)}remove(){this.slotStorage.remove(this.slot)}close(){window.removeEventListener("storage",this.internalStorageListener)}}(o,r),touchUI:"ontouchstart"in window}).build(window.document.body)})})}();
\ No newline at end of file
diff --git a/web/scripts/interface/CodeEditor.mjs b/web/scripts/interface/CodeEditor.mjs
index 6b9b764..674037d 100644
--- a/web/scripts/interface/CodeEditor.mjs
+++ b/web/scripts/interface/CodeEditor.mjs
@@ -39,6 +39,15 @@ function findNextToken(block, skip) {
 	return null;
 }
 
+function lineWithinRange(doc, ln, start, end) {
+	const full = doc.getLine(ln);
+	const begin = (ln === start.line) ? start.ch : 0;
+	return {
+		chOffset: begin,
+		line: (ln === end.line) ? full.slice(begin, end.ch) : full.slice(begin),
+	};
+}
+
 export default class CodeEditor extends EventObject {
 	constructor(dom, container, {
 		mode = '',
@@ -143,8 +152,8 @@ export default class CodeEditor extends EventObject {
 			this.code.off('cursorActivity', move);
 			this.paramMarkers.forEach((m) => m.clear());
 			this.paramMarkers = null;
+			this.code.setCursor(endBookmark.find());
 			endBookmark.clear();
-			this.code.setCursor(end);
 			this.cancelParams = null;
 			this.advanceParams = null;
 		};
@@ -170,12 +179,12 @@ export default class CodeEditor extends EventObject {
 
 		const doc = this.code.getDoc();
 		const ranges = [];
-		let {ch} = start;
-		for(let ln = start.line; ln < endBookmark.find().line; ++ ln) {
-			const line = doc.getLine(ln).slice(ch);
+		const end = endBookmark.find();
+		for(let ln = start.line; ln <= end.line; ++ ln) {
+			const {chOffset, line} = lineWithinRange(doc, ln, start, end);
 			for(let p = 0; (p = line.indexOf(tok, p)) !== -1; p += tok.length) {
-				const anchor = {ch: p, line: ln};
-				const head = {ch: p + tok.length, line: ln};
+				const anchor = {ch: chOffset + p, line: ln};
+				const head = {ch: chOffset + p + tok.length, line: ln};
 				ranges.push({anchor, head});
 				this.paramMarkers.push(doc.markText(anchor, head, {
 					className: 'param',
@@ -184,7 +193,6 @@ export default class CodeEditor extends EventObject {
 					inclusiveRight: true,
 				}));
 			}
-			ch = 0;
 		}
 
 		if(ranges.length > 0) {
@@ -194,11 +202,39 @@ export default class CodeEditor extends EventObject {
 		}
 	}
 
-	addCodeBlock(block) {
-		const lines = block.split('\n').length;
+	hasSelection() {
+		const from = this.code.getCursor('from');
+		const to = this.code.getCursor('to');
+		return from.line !== to.line || from.ch !== to.ch;
+	}
 
-		this.code.focus();
+	internalAddSurroundCode(block) {
+		if(this.enhanced) {
+			if(this.hasSelection()) {
+				this.code.replaceSelection(
+					block.replace(/\{.*\}/, this.code.getSelection()),
+					'end',
+					'library'
+				);
+			} else {
+				const cur = this.code.getCursor('head');
+				this.code.replaceSelection(block, null, 'library');
+				const end = {ch: cur.ch + block.length, line: cur.line};
+				this.enterParams(cur, end, block);
+			}
+		} else {
+			const value = this.value();
+			const s1 = this.code.element.selectionStart;
+			const s2 = this.code.element.selectionEnd;
+			const wrapped = block.replace(/\{.*\}/, value.substring(s1, s2));
+			this.code
+				.val(value.substr(0, s1) + wrapped + value.substr(s2))
+				.select(s1 + wrapped.length);
+			this.trigger('change');
+		}
+	}
 
+	internalAddIndependentCode(block) {
 		if(this.enhanced) {
 			const cur = this.code.getCursor('head');
 			const pos = {ch: 0, line: cur.line + ((cur.ch > 0) ? 1 : 0)};
@@ -207,6 +243,7 @@ export default class CodeEditor extends EventObject {
 				replaced = '\n' + replaced;
 			}
 			this.code.replaceRange(replaced, pos, null, 'library');
+			const lines = block.split('\n').length;
 			const end = {ch: 0, line: pos.line + lines};
 			this.enterParams(pos, end, block);
 		} else {
@@ -224,6 +261,16 @@ export default class CodeEditor extends EventObject {
 		}
 	}
 
+	addCodeBlock(block, surround = false) {
+		this.code.focus();
+
+		if(surround) {
+			this.internalAddSurroundCode(block);
+		} else {
+			this.internalAddIndependentCode(block);
+		}
+	}
+
 	value() {
 		if(this.enhanced) {
 			return this.code.getDoc().getValue();
diff --git a/web/scripts/interface/ComponentsLibrary.mjs b/web/scripts/interface/ComponentsLibrary.mjs
index 9d2235c..411c5ad 100644
--- a/web/scripts/interface/ComponentsLibrary.mjs
+++ b/web/scripts/interface/ComponentsLibrary.mjs
@@ -250,51 +250,61 @@ export default [
 	{
 		code: '**{text}**',
 		preview: 'A -> B: **bold**',
+		surround: true,
 		title: 'Bold markdown',
 	},
 	{
 		code: '_{text}_',
 		preview: 'A -> B: _italic_',
+		surround: true,
 		title: 'Italic markdown',
 	},
 	{
 		code: '~{text}~',
 		preview: 'A -> B: ~strikeout~',
+		surround: true,
 		title: 'Strikeout markdown',
 	},
 	{
 		code: '<u>{text}</u>',
 		preview: 'A -> B: <u>underline</u>',
+		surround: true,
 		title: 'Underline markdown',
 	},
 	{
 		code: '<o>{text}</o>',
 		preview: 'A -> B: <o>overline</o>',
+		surround: true,
 		title: 'Overline markdown',
 	},
 	{
 		code: '<sup>{text}</sup>',
 		preview: 'A -> B: super<sup>script</sup>',
+		surround: true,
 		title: 'Superscript markdown',
 	},
 	{
 		code: '<sub>{text}</sub>',
 		preview: 'A -> B: sub<sub>script</sub>',
+		surround: true,
 		title: 'Subscript markdown',
 	},
 	{
 		code: '`{text}`',
 		preview: 'A -> B: `mono`',
+		surround: true,
 		title: 'Monospace markdown',
 	},
 	{
 		code: '<red>{text}</red>',
 		preview: 'A -> B: <red>red</red>',
+		surround: true,
 		title: 'Red markdown',
 	},
 	{
 		code: '<highlight>{text}</highlight>',
 		preview: 'A -> B: <highlight>highlight</highlight>',
+		surround: true,
 		title: 'Highlight markdown',
 	},
 	{
diff --git a/web/scripts/interface/Interface.mjs b/web/scripts/interface/Interface.mjs
index 486a601..8af03fa 100644
--- a/web/scripts/interface/Interface.mjs
+++ b/web/scripts/interface/Interface.mjs
@@ -381,7 +381,10 @@ export default class Interface {
 				.setClass('library-item')
 				.add(holdInner)
 				.fastClick()
-				.on('click', () => this.code.addCodeBlock(lib.code))
+				.on('click', () => this.code.addCodeBlock(
+					lib.code,
+					lib.surround
+				))
 				.attach(container);
 
 			return this.diagram.clone({