diff --git a/web/lib/editor.js b/web/lib/editor.js
index 2a006f1..025e65e 100644
--- a/web/lib/editor.js
+++ b/web/lib/editor.js
@@ -558,6 +558,8 @@
 	const DELAY_STAGECHANGE = 250;
 	const PNG_RESOLUTION = 4;
 
+	const PARAM_PATTERN = /\{[^}]+\}/g;
+
 	function addNewline(value) {
 		if(value.length > 0 && value.charAt(value.length - 1) !== '\n') {
 			return value + '\n';
@@ -578,6 +580,23 @@
 		}
 	}
 
+	function cmInRange(pos, {from, to}) {
+		return !(
+			pos.line < from.line || (pos.line === from.line && pos.ch < from.ch) ||
+			pos.line > to.line || (pos.line === to.line && pos.ch > to.ch)
+		);
+	}
+
+	function findNextToken(block, skip) {
+		PARAM_PATTERN.lastIndex = 0;
+		for(let m = null; (m = PARAM_PATTERN.exec(block));) {
+			if(!skip.includes(m[0])) {
+				return m[0];
+			}
+		}
+		return null;
+	}
+
 	function simplifyPreview(code) {
 		return 'headers fade\nterminators fade\n' + code
 			.replace(/\{Agent([0-9]*)\}/g, (match, num) => {
@@ -775,7 +794,7 @@
 				const [touch] = e.touches;
 				pt.x = touch.pageX;
 				pt.y = touch.pageY;
-			})
+			}, {passive: true})
 			.on('touchend', (e) => {
 				if(
 					pt.x === -1 ||
@@ -1158,7 +1177,7 @@
 		buildViewPane() {
 			this.viewPaneInner = this.dom.el('div').setClass('pane-view-inner')
 				.add(this.diagram.dom())
-				.on('touchstart', () => this._hideURLBuilder())
+				.on('touchstart', () => this._hideURLBuilder(), {passive: true})
 				.on('mousedown', () => this._hideURLBuilder());
 
 			this.errorMsg = this.dom.el('div').setClass('msg-error');
@@ -1269,19 +1288,107 @@
 			this._enhanceEditor();
 		}
 
+		enterParams(start, end, block) {
+			const doc = this.code.getDoc();
+			const endBookmark = doc.setBookmark(end);
+			const done = [];
+
+			const keydown = (cm, event) => {
+				switch(event.keyCode) {
+				case 13:
+				case 9:
+					event.preventDefault();
+					this.advanceParams();
+					break;
+				case 27:
+					event.preventDefault();
+					this.cancelParams();
+					break;
+				}
+			};
+
+			const move = () => {
+				if(this.paramMarkers.length === 0) {
+					return;
+				}
+				const m = this.paramMarkers[0].find();
+				const [r] = doc.listSelections();
+				if(!cmInRange(r.anchor, m) || !cmInRange(r.head, m)) {
+					this.cancelParams();
+					this.code.setSelection(r.anchor, r.head);
+				}
+			};
+
+			this.paramMarkers = [];
+			this.cancelParams = () => {
+				this.code.off('keydown', keydown);
+				this.code.off('cursorActivity', move);
+				this.paramMarkers.forEach((m) => m.clear());
+				this.paramMarkers = null;
+				endBookmark.clear();
+				this.code.setCursor(end);
+				this.cancelParams = null;
+				this.advanceParams = null;
+			};
+			this.advanceParams = () => {
+				this.paramMarkers.forEach((m) => m.clear());
+				this.paramMarkers.length = 0;
+				this.nextParams(start, endBookmark, block, done);
+			};
+
+			this.code.on('keydown', keydown);
+			this.code.on('cursorActivity', move);
+
+			this.advanceParams();
+		}
+
+		nextParams(start, endBookmark, block, done) {
+			const tok = findNextToken(block, done);
+			if(!tok) {
+				this.cancelParams();
+				return;
+			}
+			done.push(tok);
+
+			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);
+				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};
+					ranges.push({anchor, head});
+					this.paramMarkers.push(doc.markText(anchor, head, {
+						className: 'param',
+						clearWhenEmpty: false,
+						inclusiveLeft: true,
+						inclusiveRight: true,
+					}));
+				}
+				ch = 0;
+			}
+
+			if(ranges.length > 0) {
+				doc.setSelections(ranges, 0);
+			} else {
+				this.cancelParams();
+			}
+		}
+
 		addCodeBlock(block) {
 			const lines = block.split('\n').length;
 
 			if(this.code.getCursor) {
 				const cur = this.code.getCursor('head');
 				const pos = {ch: 0, line: cur.line + ((cur.ch > 0) ? 1 : 0)};
-				this.code.replaceRange(
-					addNewline(block),
-					pos,
-					null,
-					'library'
-				);
-				this.code.setCursor({ch: 0, line: pos.line + lines});
+				let replaced = addNewline(block);
+				if(pos.line >= this.code.lineCount()) {
+					replaced = '\n' + replaced;
+				}
+				this.code.replaceRange(replaced, pos, null, 'library');
+				const end = {ch: 0, line: pos.line + lines};
+				this.enterParams(pos, end, block);
 			} else {
 				const value = this.value();
 				const cur = this.code.element.selectionStart;
diff --git a/web/lib/editor.min.js b/web/lib/editor.min.js
index 805ec4a..664a60c 100644
--- a/web/lib/editor.min.js
+++ b/web/lib/editor.min.js
@@ -1 +1 @@
-!function(){"use strict";function e(e){return null===e?null:e.element?e.element:e}function t(e){return e.length>0&&"\n"!==e.charAt(e.length-1)?e+"\n":e}function i(e,t){let i=0,s=0;for(;;){const n=e.indexOf("\n",i)+1;if(t<n||0===n)return{ch:t-i,line:s};i=n,++s}}function s(e,t){const i=e.toString(),s=i.indexOf(".");return-1===s||i.length-s-1<=t?i:e.toFixed(t)}var n=[{code:"{Agent1} -> {Agent2}: {Message}",title:"Simple arrow (synchronous)"},{code:"{Agent1} --\x3e {Agent2}: {Message}",title:"Arrow with dotted line (response)"},{code:"{Agent1} ->> {Agent2}: {Message}",title:"Open arrow (asynchronous)"},{code:"{Agent1} -x {Agent2}: {Message}",title:"Lost message"},{code:"{Agent1} ~> {Agent2}: {Message}",title:"Wavy line"},{code:"{Agent1} -> {Agent1}: {Message}",title:"Self-connection"},{code:"{Agent1} -> ...{id}\n...{id} -> {Agent2}: {Message}",preview:"begin A, B\nA -> ...x\n...x -> B: Message",title:"Asynchronous message"},{code:"* -> {Agent1}: {Message}",title:"Found message"},{code:"{Agent1} -> {Agent2}\n& {Agent1} -> {Agent3}: {Broadcast}",title:"Broadcast message"},{code:"{Agent1} -> +{Agent2}: {Request}\n{Agent1} <-- -{Agent2}: {Response}",title:"Request/response pair"},{code:"{Agent1} -> *{Agent2}: {Request}\n{Agent1} <-- !{Agent2}: {Response}",title:"Inline agent creation / destruction"},{code:"{Agent1} -> {Agent2}: {Request}\n{Agent1} <-- {Agent2}: {Response}\nend {Agent2}",preview:"begin A\n::\nA -> B: Request\nA <-- B: Response\nend B",title:"Agent creation / destruction"},{code:'autolabel "[<inc>] <label>"',preview:'autolabel "[<inc>] <label>"\nA -> B: Foo\nA <- B: Bar\nA -> B: Baz',title:"Numbered labels"},{code:"if {Condition1}\n  {Agent1} -> {Agent2}\nelse if {Condition2}\n  {Agent1} -> {Agent2}\nelse\n  {Agent1} -> {Agent2}\nend",preview:"begin A, B\nif Condition1\n  A -> B\nelse if Condition2\n  A -> B\nelse\n  A -> B\nend",title:"Conditional blocks"},{code:"repeat {Condition}\n  {Agent1} -> {Agent2}\nend",preview:"begin A, B\nrepeat Condition\n  A -> B\nend",title:"Repeated block"},{code:"begin reference: {Label} as {Name}\n{Agent1} -> {Name}\nend {Name}",preview:'begin A\nbegin reference: "See 1.3" as myRef\nA -> myRef\nmyRef -> A\nend myRef',title:"Reference"},{code:"begin reference over {Covered}: {Label} as {Name}\n{Agent1} -> {Name}\nend {Name}",preview:'begin A, B, C\nbegin reference over B, C: "See 1.3" as myRef\nA -> myRef\nmyRef -> A\nend myRef',title:"Reference over agents"},{code:"group {Label}\n  {Agent1} -> {Agent2}\nend",preview:"begin A, B\ngroup Label\n  A -> B\nend",title:"Group"},{code:"note over {Agent1}: {Message}",title:"Note over agent"},{code:"note over {Agent1}, {Agent2}: {Message}",title:"Note over multiple agents"},{code:"note left of {Agent1}: {Message}",title:"Note left of agent"},{code:"note right of {Agent1}: {Message}",title:"Note right of agent"},{code:"note between {Agent1}, {Agent2}: {Message}",title:"Note between agents"},{code:"{Agent1} -> {Agent2}\n& note right of {Agent2}: {Message}",title:"Inline note"},{code:"state over {Agent1}: {State}",title:"State over agent"},{code:"[ -> {Agent1}: {Message1}\n{Agent1} -> ]: {Message2}",title:"Arrows to/from the sides"},{code:"text right: {Message}",preview:'A -> B\nsimultaneously:\ntext right: "Message\\non the\\nside"',title:"Text beside the diagram"},{code:"divider space with height 10: {message}",preview:"begin A, B, C, D, E, F\ndivider space with height 30: message",title:"Vertical space divider"},{code:"divider line with height 10: {message}",preview:"begin A, B, C, D, E, F\ndivider line with height 30: message",title:"Line divider"},{code:"divider delay with height 10: {message}",preview:"begin A, B, C, D, E, F\ndivider delay with height 30: message",title:"Delay divider"},{code:"divider tear with height 10: {message}",preview:"begin A, B, C, D, E, F\ndivider tear with height 30: message",title:"Tear divider"},{code:"title {Title}",preview:"headers box\ntitle Title\nA -> B",title:"Title"},{code:"**{text}**",preview:"A -> B: **bold**",title:"Bold markdown"},{code:"_{text}_",preview:"A -> B: _italic_",title:"Italic markdown"},{code:"~{text}~",preview:"A -> B: ~strikeout~",title:"Strikeout markdown"},{code:"<u>{text}</u>",preview:"A -> B: <u>underline</u>",title:"Underline markdown"},{code:"<o>{text}</o>",preview:"A -> B: <o>overline</o>",title:"Overline markdown"},{code:"<sup>{text}</sup>",preview:"A -> B: super<sup>script</sup>",title:"Superscript markdown"},{code:"<sub>{text}</sub>",preview:"A -> B: sub<sub>script</sub>",title:"Subscript markdown"},{code:"`{text}`",preview:"A -> B: `mono`",title:"Monospace markdown"},{code:"<red>{text}</red>",preview:"A -> B: <red>red</red>",title:"Red markdown"},{code:"<highlight>{text}</highlight>",preview:"A -> B: <highlight>highlight</highlight>",title:"Highlight markdown"},{code:"{Agent} is red",preview:"headers box\nA is red\nbegin A",title:"Red agent line"},{code:"{Agent} is a database",preview:"headers box\nA is a database\nbegin A",title:"Database indicator"},{code:"theme monospace",preview:"headers box\ntitle mono\ntheme monospace\nA -> B",title:"Monospace theme"},{code:"theme chunky",preview:"headers box\ntitle chunky\ntheme chunky\nA -> B",title:"Chunky theme"},{code:"theme sketch",preview:"headers box\ntitle sketch\ntheme sketch\nA -> B",title:"Sketch theme"},{code:"terminators cross",preview:"begin A\nterminators cross",title:"Cross terminators"},{code:"terminators fade",preview:"begin A\nterminators fade",title:"Fade terminators"},{code:"terminators bar",preview:"begin A\nterminators bar",title:"Bar terminators"},{code:"terminators box",preview:"begin A\nterminators box",title:"Box terminators"}];class o{constructor(e){this.element=e}addBefore(t=null,i=null){if(null===t)return this;if(Array.isArray(t))for(const e of t)this.addBefore(e,i);else{const s=function(e,t){return"string"==typeof e?t.createTextNode(e):"number"==typeof e?t.createTextNode(e.toString(10)):"object"==typeof e&&e.element?e.element:e}(t,this.element.ownerDocument);this.element.insertBefore(s,e(i))}return this}add(...e){return this.addBefore(e,null)}del(t=null){return null!==t&&this.element.removeChild(e(t)),this}attr(e,t){return this.element.setAttribute(e,t),this}attrs(e){for(const t in e)Object.prototype.hasOwnProperty.call(e,t)&&this.element.setAttribute(t,e[t]);return this}styles(e){for(const t in e)Object.prototype.hasOwnProperty.call(e,t)&&(this.element.style[t]=e[t]);return this}setClass(e){return this.attr("class",e)}addClass(e){const t=this.element.getAttribute("class");if(!t)return this.setClass(e);const i=t.split(" ");return i.includes(e)?this:(i.push(e),this.attr("class",i.join(" ")))}delClass(e){const t=this.element.getAttribute("class");if(!t)return this;const i=t.split(" "),s=i.indexOf(e);return-1!==s&&(i.splice(s,1),this.attr("class",i.join(" "))),this}text(e){return this.element.textContent=e,this}on(e,t,i={}){if(Array.isArray(e))for(const s of e)this.on(s,t,i);else this.element.addEventListener(e,t,i);return this}off(e,t,i={}){if(Array.isArray(e))for(const s of e)this.off(s,t,i);else this.element.removeEventListener(e,t,i);return this}val(e){return this.element.value=e,this}select(e,t=null){return this.element.selectionStart=e,this.element.selectionEnd=null===t?e:t,this}focus(){return this.element.focus(),this}focussed(){return this.element===this.element.ownerDocument.activeElement}empty(){for(;this.element.childNodes.length>0;)this.element.removeChild(this.element.lastChild);return this}attach(t){return e(t).appendChild(this.element),this}detach(){return this.element.parentNode&&this.element.parentNode.removeChild(this.element),this}}class r{constructor(e){if(!e)throw new Error("Missing document!");this.document=e,this.wrap=this.wrap.bind(this),this.el=this.el.bind(this),this.txt=this.txt.bind(this)}wrap(e){return e.element?e:new o(e)}el(e,t=null){let i=null;return i=null===t?this.document.createElement(e):this.document.createElementNS(t,e),new o(i)}txt(e=""){return this.document.createTextNode(e)}}r.WrappedElement=o;const l=500,d=250,a=4;r.WrappedElement.prototype.split=function(e,t){return this.add(e),function(e,t){const i=[],s={direction:t.direction,minSize:[],sizes:[],snapOffset:t.snapOffset};let n=0;for(let o=0;o<e.length;++o)e[o]&&(i.push(e[o]),s.minSize.push(t.minSize[o]),s.sizes.push(t.sizes[o]),n+=t.sizes[o]);for(let t=0;t<i.length;++t){s.minSize[t]*=100/n,s.sizes[t]*=100/n;const i=s.sizes[t]+"%";"vertical"===s.direction?e[t].styles({boxSizing:"border-box",height:i,width:"100%"}):e[t].styles({boxSizing:"border-box",display:"inline-block",height:"100%",verticalAlign:"top",width:i})}i.length<2||t.require(["split"],t=>{const n=e[0].element.parentNode,o=n.addEventListener,r=n.removeEventListener;n.addEventListener=((e,t)=>{"mousemove"===e||"touchmove"===e?window.addEventListener(e,t,{passive:!0}):o.call(n,e,t)}),n.removeEventListener=((e,t)=>{"mousemove"===e||"touchmove"===e?window.removeEventListener(e,t):r.call(n,e,t)});let l=null;const d="vertical"===s.direction?"row-resize":"col-resize";return new t(i.map(e=>e.element),Object.assign({cursor:d,direction:"vertical",gutterSize:0,onDragEnd:()=>{document.body.style.cursor=l,l=null},onDragStart:()=>{l=document.body.style.cursor,document.body.style.cursor=d}},s))})}(e,t),this},r.WrappedElement.prototype.fastClick=function(){const e={x:-1,y:0};return this.on("touchstart",t=>{const[i]=t.touches;e.x=i.pageX,e.y=i.pageY}).on("touchend",t=>{if(-1===e.x||0!==t.touches.length||1!==t.changedTouches.length)return void(e.x=-1);const[i]=t.changedTouches;Math.abs(e.x-i.pageX)<10&&Math.abs(e.y-i.pageY)<10&&(t.preventDefault(),t.target.click()),e.x=-1})};var h=window.SequenceDiagram;const c=window.requirejs,u={},m={},g=window.document.getElementsByTagName("meta");for(let e=0;e<g.length;++e){const t=g[e],i=t.getAttribute("name");if(i&&i.startsWith("cdn-")){const e=i.substr("cdn-".length);let s=t.getAttribute("content");s.endsWith(".mjs")?s=s.substr(0,s.length-".mjs".length):s.endsWith(".js")&&(s=s.substr(0,s.length-".js".length)),u[e]=s;const n=t.getAttribute("data-integrity");n&&(m[e]=n)}}c.config({hashes:m,onNodeCreated:(e,t,i)=>{t.hashes[i]&&(e.setAttribute("integrity",t.hashes[i]),e.setAttribute("crossorigin","anonymous"))},paths:u});window.addEventListener("load",()=>{const e=window.document.getElementById("loader"),[o]=e.getElementsByTagName("nav"),u=o.getElementsByTagName("a"),m=[];for(let e=0;e<u.length;++e){const t=u[e];m.push({href:t.getAttribute("href"),label:t.textContent,touchLabel:t.dataset.touch})}const g=new class{constructor({sequenceDiagram:e,defaultCode:t="",localStorage:i="",library:s=[],links:n=[],require:o=null,touchUI:r=!1}){this.diagram=e,this.defaultCode=t,this.localStorage=i,this.library=s,this.links=n,this.minScale=1.5,this.require=o||(()=>null),this.touchUI=r,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()),this.pngDirty=!0}).on("mouseover",e=>{this.marker&&this.marker.clear(),void 0!==e.ln&&this.code.markText&&(this.marker=this.code.markText({ch:0,line:e.ln},{ch:0,line:e.ln+1},{className:"hover",clearOnEnter:!0,inclusiveLeft:!1,inclusiveRight:!1}))}).on("mouseout",()=>{this.marker&&(this.marker.clear(),this.marker=null)}).on("click",e=>{this.marker&&(this.marker.clear(),this.marker=null),void 0!==e.ln&&this.code.setSelection&&(this.code.setSelection({ch:0,line:e.ln},{ch:0,line:e.ln+1},{bias:-1,origin:"+focus"}),this.code.focus()),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)});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()});const i=this.dom.el("div").setClass("config").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),this.urlOutput,t,e),s=this.dom.el("div").setClass("urlbuilder").styles({display:"none"}).add(this.dom.el("div").setClass("message").add("Loading…"));return this.renderService="",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("<svg")||(t="render/"),this.renderService=new URL(t,window.location.href).href,s.empty().add(i),this._refreshURL()}).catch(()=>{s.empty().add(this.dom.el("div").setClass("message").add("No online rendering service available."))}),s}_refreshURL(){this.urlOutput.val(this.renderService+function(e,{height:t,width:i,zoom:n}){const o=e.split("\n").map(encodeURIComponent).filter(e=>""!==e).join("/");let r="";return Number.isNaN(i)&&Number.isNaN(t)?Number.isNaN(n)||1===n||(r+="z"+s(Math.max(n,0),4),r+="/"):(Number.isNaN(i)||(r+="w"+s(Math.max(i,0),4)),Number.isNaN(t)||(r+="h"+s(Math.max(t,0),4)),r+="/"),r+o+".svg"}(this.value(),{height:Number.parseFloat(this.urlHeight.element.value),width:Number.parseFloat(this.urlWidth.element.value),zoom:Number.parseFloat(this.urlZoom.element.value||"1")}))}_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 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class{constructor({sequenceDiagram:e,defaultCode:t="",localStorage:i="",library:s=[],links:n=[],require:r=null,touchUI:o=!1}){this.diagram=e,this.defaultCode=t,this.localStorage=i,this.library=s,this.links=n,this.minScale=1.5,this.require=r||(()=>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()),this.pngDirty=!0}).on("mouseover",e=>{this.marker&&this.marker.clear(),void 0!==e.ln&&this.code.markText&&(this.marker=this.code.markText({ch:0,line:e.ln},{ch:0,line:e.ln+1},{className:"hover",clearOnEnter:!0,inclusiveLeft:!1,inclusiveRight:!1}))}).on("mouseout",()=>{this.marker&&(this.marker.clear(),this.marker=null)}).on("click",e=>{this.marker&&(this.marker.clear(),this.marker=null),void 0!==e.ln&&this.code.setSelection&&(this.code.setSelection({ch:0,line:e.ln},{ch:0,line:e.ln+1},{bias:-1,origin:"+focus"}),this.code.focus()),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)});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()});const i=this.dom.el("div").setClass("config").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),this.urlOutput,t,e),s=this.dom.el("div").setClass("urlbuilder").styles({display:"none"}).add(this.dom.el("div").setClass("message").add("Loading…"));return this.renderService="",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("<svg")||(t="render/"),this.renderService=new URL(t,window.location.href).href,s.empty().add(i),this._refreshURL()}).catch(()=>{s.empty().add(this.dom.el("div").setClass("message").add("No online rendering service available."))}),s}_refreshURL(){this.urlOutput.val(this.renderService+function(e,{height:t,width:i,zoom:s}){const r=e.split("\n").map(encodeURIComponent).filter(e=>""!==e).join("/");let o="";return Number.isNaN(i)&&Number.isNaN(t)?Number.isNaN(s)||1===s||(o+="z"+n(Math.max(s,0),4),o+="/"):(Number.isNaN(i)||(o+="w"+n(Math.max(i,0),4)),Number.isNaN(t)||(o+="h"+n(Math.max(t,0),4)),o+="/"),o+r+".svg"}(this.value(),{height:Number.parseFloat(this.urlHeight.element.value),width:Number.parseFloat(this.urlWidth.element.value),zoom:Number.parseFloat(this.urlZoom.element.value||"1")}))}_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),s=this.dom.el("div").setClass("library-item").add(i).fastClick().on("click",this.addCodeBlock.bind(this,t.code)).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,n)=>{window.console.warn("Failed to render preview",n),s.attr("class","library-item broken"),i.text(t.code)})});try{this.diagram.renderAll(t)}catch(e){}return e}buildCodePane(){return this.code=this.dom.el("textarea").setClass("editor-simple").val(this.loadCode()||this.defaultCode).on("input",()=>this.update(!1)),this.dom.el("div").setClass("pane-code").add(this.code)}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 l(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[s]=i;return s.getAsFile?s.getAsFile():s}(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(),s=this.buildViewPane(),n=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([s,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(...n,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}),s],{direction:"horizontal",minSize:[10,10],require:this.require,sizes:[30,70],snapOffset:70}),this.dom.el("div").setClass("options links").add(n),this.buildOptionsDownloads()),"undefined"!=typeof window&&window.addEventListener("keydown",e=>{27===e.keyCode&&this._hideURLBuilder()}),setTimeout(this.update.bind(this),0),this._enhanceEditor()}enterParams(e,t,i){const n=this.code.getDoc(),r=n.setBookmark(t),o=[],l=(e,t)=>{switch(t.keyCode){case 13:case 9:t.preventDefault(),this.advanceParams();break;case 27:t.preventDefault(),this.cancelParams()}},a=()=>{if(0===this.paramMarkers.length)return;const e=this.paramMarkers[0].find(),[t]=n.listSelections();s(t.anchor,e)&&s(t.head,e)||(this.cancelParams(),this.code.setSelection(t.anchor,t.head))};this.paramMarkers=[],this.cancelParams=(()=>{this.code.off("keydown",l),this.code.off("cursorActivity",a),this.paramMarkers.forEach(e=>e.clear()),this.paramMarkers=null,r.clear(),this.code.setCursor(t),this.cancelParams=null,this.advanceParams=null}),this.advanceParams=(()=>{this.paramMarkers.forEach(e=>e.clear()),this.paramMarkers.length=0,this.nextParams(e,r,i,o)}),this.code.on("keydown",l),this.code.on("cursorActivity",a),this.advanceParams()}nextParams(e,t,i,s){const n=function(e,t){c.lastIndex=0;for(let i=null;i=c.exec(e);)if(!t.includes(i[0]))return i[0];return null}(i,s);if(!n)return void this.cancelParams();s.push(n);const r=this.code.getDoc(),o=[];let{ch:l}=e;for(let i=e.line;i<t.find().line;++i){const e=r.getLine(i).slice(l);for(let t=0;-1!==(t=e.indexOf(n,t));t+=n.length){const e={ch:t,line:i},s={ch:t+n.length,line:i};o.push({anchor:e,head:s}),this.paramMarkers.push(r.markText(e,s,{className:"param",clearWhenEmpty:!1,inclusiveLeft:!0,inclusiveRight:!0}))}l=0}o.length>0?r.setSelections(o,0):this.cancelParams()}addCodeBlock(e){const i=e.split("\n").length;if(this.code.getCursor){const s=this.code.getCursor("head"),n={ch:0,line:s.line+(s.ch>0?1:0)};let r=t(e);n.line>=this.code.lineCount()&&(r="\n"+r),this.code.replaceRange(r,n,null,"library");const o={ch:0,line:n.line+i};this.enterParams(n,o,e)}else{const i=this.value(),s=this.code.element.selectionStart,n=("\n"+i+"\n").indexOf("\n",s),r=t(i.substr(0,n))+t(e);this.code.val(r+i.substr(n)).select(r.length),this.update(!1)}this.code.focus()}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)}saveCode(e){if(this.localStorage)try{window.localStorage.setItem(this.localStorage,e)}catch(e){}}loadCode(){if(!this.localStorage)return"";try{return window.localStorage.getItem(this.localStorage)||""}catch(e){return""}}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")}value(){return this.code.getDoc?this.code.getDoc().getValue():this.code.element.value}setValue(e){if(this.code.getDoc){const t=this.code.getDoc();t.setValue(e),t.clearHistory()}else this.code.val(e);this.diagram.expandAll({render:!1}),this.update(!0),this.diagram.setHighlight(null)}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.setValue(t)})}update(e=!0){this._hideURLBuilder();const t=this.value();this.saveCode(t);let i=null;try{i=this.diagram.process(t)}catch(e){return void this.markError(e)}this.markOK();let s=0;if(!e&&this.renderedSeq){const e=this.renderedSeq;i.agents.length!==e.agents.length?s=a:i.stages.length!==e.stages.length&&(s=d)}this.redrawDebounced(i,s)}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:h}).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()}_enhanceEditor(){this.require(["cm/lib/codemirror","cm/addon/hint/show-hint","cm/addon/edit/trailingspace","cm/addon/comment/comment"],e=>{this.diagram.registerCodeMirrorMode(e);const t=this.code.element.selectionStart,s=this.code.element.selectionEnd,n=this.code.element.value,r=this.code.focussed(),o=new e(this.code.element.parentNode,{extraKeys:{"Cmd-/":e=>e.toggleComment({padding:""}),"Cmd-Enter":"autocomplete","Ctrl-/":e=>e.toggleComment({padding:""}),"Ctrl-Enter":"autocomplete","Ctrl-Space":"autocomplete","Shift-Tab":e=>e.execCommand("indentLess"),Tab:e=>e.execCommand("indentMore")},globals:{themes:this.diagram.getThemeNames()},lineNumbers:!0,mode:"sequence",showTrailingSpace:!0,value:n});this.code.detach(),o.getDoc().setSelection(i(n,t),i(n,s));let l=0;o.on("keydown",(e,t)=>{l=t.keyCode}),o.on("change",(t,i)=>{if(this.update(!1),"+input"===i.origin){if(13===l)return void(l=0)}else if("complete"!==i.origin)return;e.commands.autocomplete(t,null,{completeSingle:!1})}),o.on("focus",()=>this._hideURLBuilder()),o.on("cursorActivity",()=>{const e=o.getCursor("from").line,t=o.getCursor("to").line;this.diagram.setHighlight(Math.min(e,t))}),r&&o.focus(),this.code=o})}}({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:r,links:p,localStorage:"src",require:m,sequenceDiagram:new u,touchUI:"ontouchstart"in window});e.parentNode.removeChild(e),b.build(window.document.body)})}();
\ No newline at end of file
diff --git a/web/scripts/interface/Interface.mjs b/web/scripts/interface/Interface.mjs
index a6494b4..338bc95 100644
--- a/web/scripts/interface/Interface.mjs
+++ b/web/scripts/interface/Interface.mjs
@@ -6,6 +6,8 @@ const DELAY_AGENTCHANGE = 500;
 const DELAY_STAGECHANGE = 250;
 const PNG_RESOLUTION = 4;
 
+const PARAM_PATTERN = /\{[^}]+\}/g;
+
 function addNewline(value) {
 	if(value.length > 0 && value.charAt(value.length - 1) !== '\n') {
 		return value + '\n';
@@ -26,6 +28,23 @@ function findPos(content, index) {
 	}
 }
 
+function cmInRange(pos, {from, to}) {
+	return !(
+		pos.line < from.line || (pos.line === from.line && pos.ch < from.ch) ||
+		pos.line > to.line || (pos.line === to.line && pos.ch > to.ch)
+	);
+}
+
+function findNextToken(block, skip) {
+	PARAM_PATTERN.lastIndex = 0;
+	for(let m = null; (m = PARAM_PATTERN.exec(block));) {
+		if(!skip.includes(m[0])) {
+			return m[0];
+		}
+	}
+	return null;
+}
+
 function simplifyPreview(code) {
 	return 'headers fade\nterminators fade\n' + code
 		.replace(/\{Agent([0-9]*)\}/g, (match, num) => {
@@ -223,7 +242,7 @@ DOMWrapper.WrappedElement.prototype.fastClick = function() {
 			const [touch] = e.touches;
 			pt.x = touch.pageX;
 			pt.y = touch.pageY;
-		})
+		}, {passive: true})
 		.on('touchend', (e) => {
 			if(
 				pt.x === -1 ||
@@ -606,7 +625,7 @@ export default class Interface {
 	buildViewPane() {
 		this.viewPaneInner = this.dom.el('div').setClass('pane-view-inner')
 			.add(this.diagram.dom())
-			.on('touchstart', () => this._hideURLBuilder())
+			.on('touchstart', () => this._hideURLBuilder(), {passive: true})
 			.on('mousedown', () => this._hideURLBuilder());
 
 		this.errorMsg = this.dom.el('div').setClass('msg-error');
@@ -717,19 +736,107 @@ export default class Interface {
 		this._enhanceEditor();
 	}
 
+	enterParams(start, end, block) {
+		const doc = this.code.getDoc();
+		const endBookmark = doc.setBookmark(end);
+		const done = [];
+
+		const keydown = (cm, event) => {
+			switch(event.keyCode) {
+			case 13:
+			case 9:
+				event.preventDefault();
+				this.advanceParams();
+				break;
+			case 27:
+				event.preventDefault();
+				this.cancelParams();
+				break;
+			}
+		};
+
+		const move = () => {
+			if(this.paramMarkers.length === 0) {
+				return;
+			}
+			const m = this.paramMarkers[0].find();
+			const [r] = doc.listSelections();
+			if(!cmInRange(r.anchor, m) || !cmInRange(r.head, m)) {
+				this.cancelParams();
+				this.code.setSelection(r.anchor, r.head);
+			}
+		};
+
+		this.paramMarkers = [];
+		this.cancelParams = () => {
+			this.code.off('keydown', keydown);
+			this.code.off('cursorActivity', move);
+			this.paramMarkers.forEach((m) => m.clear());
+			this.paramMarkers = null;
+			endBookmark.clear();
+			this.code.setCursor(end);
+			this.cancelParams = null;
+			this.advanceParams = null;
+		};
+		this.advanceParams = () => {
+			this.paramMarkers.forEach((m) => m.clear());
+			this.paramMarkers.length = 0;
+			this.nextParams(start, endBookmark, block, done);
+		};
+
+		this.code.on('keydown', keydown);
+		this.code.on('cursorActivity', move);
+
+		this.advanceParams();
+	}
+
+	nextParams(start, endBookmark, block, done) {
+		const tok = findNextToken(block, done);
+		if(!tok) {
+			this.cancelParams();
+			return;
+		}
+		done.push(tok);
+
+		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);
+			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};
+				ranges.push({anchor, head});
+				this.paramMarkers.push(doc.markText(anchor, head, {
+					className: 'param',
+					clearWhenEmpty: false,
+					inclusiveLeft: true,
+					inclusiveRight: true,
+				}));
+			}
+			ch = 0;
+		}
+
+		if(ranges.length > 0) {
+			doc.setSelections(ranges, 0);
+		} else {
+			this.cancelParams();
+		}
+	}
+
 	addCodeBlock(block) {
 		const lines = block.split('\n').length;
 
 		if(this.code.getCursor) {
 			const cur = this.code.getCursor('head');
 			const pos = {ch: 0, line: cur.line + ((cur.ch > 0) ? 1 : 0)};
-			this.code.replaceRange(
-				addNewline(block),
-				pos,
-				null,
-				'library'
-			);
-			this.code.setCursor({ch: 0, line: pos.line + lines});
+			let replaced = addNewline(block);
+			if(pos.line >= this.code.lineCount()) {
+				replaced = '\n' + replaced;
+			}
+			this.code.replaceRange(replaced, pos, null, 'library');
+			const end = {ch: 0, line: pos.line + lines};
+			this.enterParams(pos, end, block);
 		} else {
 			const value = this.value();
 			const cur = this.code.element.selectionStart;
diff --git a/web/styles/editor.css b/web/styles/editor.css
index 6c41f0f..9c3ef99 100644
--- a/web/styles/editor.css
+++ b/web/styles/editor.css
@@ -148,6 +148,11 @@ html, body {
 	background: rgba(255, 0, 0, 0.2);
 }
 
+.param {
+	border: 1px solid #CC0000;
+	margin: -1px;
+}
+
 .hover {
 	background: #FFFF00;
 }