diff --git a/dist/taxonomy-bundle+riot.js b/dist/taxonomy-bundle+riot.js
index 1646ddc..63e10c6 100644
--- a/dist/taxonomy-bundle+riot.js
+++ b/dist/taxonomy-bundle+riot.js
@@ -1,2 +1,2 @@
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r=Math.max((t[n].width-e[n].width)/2,0);return"border-top-width:"+r+"px;border-bottom-width:"+r+"px;border-top-color:"+t[n].color+";border-bottom-color:"+t[n].color+";border-top-style:solid;border-bottom-style:solid;"}}]),n}()),oe=(Jt={css:null,exports:{components:{Annotation:Zt,LineRender:{css:null,exports:{state:{casing:{},lines:[]},onMounted(){this.state.casing={},this.state.lines=this.props.layers.filter((t=>{if(t.metadata&&t.metadata["taxonomy:group"]===this.props.group&&("line"==t.type||t.ref)){if(!t.metadata["taxonomy:casing"]&&!t.ref)return!0;this.state.casing[t.metadata["taxonomy:casing"]||t.ref]=t}return!1})).map((t=>(this.state.casing[t.id]&&(this.state.casing[t.id]=ie.renderLine(this.state.casing[t.id],this.props.zooms)),ie.renderLine(t,this.props.zooms)))),this.update()},getMinHeight(t){const e=12+t.maxWidth+(this.state.casing[t.id]?this.state.casing[t.id].maxWidth:0);return e>25?e:25},taxonomy:ie},template:function(t,e,n,r){return t('<h2 expr12="expr12"> </h2><div class="render-container"><div expr13="expr13" class="render-column"></div><div class="render-column"><span class="render-header">id</span><div expr17="expr17" class="render-item"></div></div></div>',[{redundantAttribute:"expr12",selector:"[expr12]",expressions:[{type:e.TEXT,childNodeIndex:0,evaluate:function(t){return t.props.title}},{type:e.ATTRIBUTE,name:"id",evaluate:function(t){return t.props.group}}]},{type:n.EACH,getKey:null,condition:null,template:t('<span expr14="expr14" class="render-header"> </span><div expr15="expr15" class="render-item"></div>',[{redundantAttribute:"expr14",selector:"[expr14]",expressions:[{type:e.TEXT,childNodeIndex:0,evaluate:function(t){return t.zoom}}]},{type:n.EACH,getKey:null,condition:function(t){return t.state.lines},template:t('<canvas expr16="expr16"></canvas>',[{expressions:[{type:e.ATTRIBUTE,name:"style",evaluate:function(t){return["min-height: ",t.getMinHeight(t.line),"px;"].join("")}}]},{redundantAttribute:"expr16",selector:"[expr16]",expressions:[{type:e.ATTRIBUTE,name:"style",evaluate:function(t){return["width: 55px; height: ",t.line[t.zoom].width,"px; background-color: ",t.line[t.zoom].color,"; ",t.taxonomy.borderStyleFromCasing(t.state.casing[t.line.id],t.line,t.zoom)," opacity: ",t.line[t.zoom].opacity,";"].join("")}}]}]),redundantAttribute:"expr15",selector:"[expr15]",itemName:"line",indexName:null,evaluate:function(t){return t.state.lines}}]),redundantAttribute:"expr13",selector:"[expr13]",itemName:"zoom",indexName:null,evaluate:function(t){return t.props.zooms}},{type:n.EACH,getKey:null,condition:function(t){return t.state.lines},template:t(" ",[{expressions:[{type:e.TEXT,childNodeIndex:0,evaluate:function(t){return[t.line.id].join("")}},{type:e.ATTRIBUTE,name:"style",evaluate:function(t){return["min-height: ",t.getMinHeight(t.line),"px;"].join("")}}]}]),redundantAttribute:"expr17",selector:"[expr17]",itemName:"line",indexName:null,evaluate:function(t){return t.state.lines}}])},name:"line-render"},PolygonRender:{css:null,exports:{state:{casing:{},polygons:[]},onMounted(){this.state.polygons=this.props.layers.filter((t=>{if(t.metadata&&t.metadata["taxonomy:group"]===this.props.group){if("fill"==t.type&&!t.metadata["taxonomy:casing"])return!0;"line"==t.type&&t.metadata["taxonomy:casing"]&&(this.state.casing[t.metadata["taxonomy:casing"]]=t)}return!1})).map((t=>(this.state.casing[t.id]?this.state.casing[t.id]={color:ie.parseColor(t,this.state.casing[t.id].paint["line-color"],this.props.zooms[0]),width:ie.parseNumber(t,this.state.casing[t.id].paint["line-width"],this.props.zooms[0]),id:this.state.casing[t.id].id}:t.paint["fill-outline-color"]&&(this.state.casing[t.id]={color:ie.parseColor(t,t.paint["fill-outline-color"],this.props.zooms[0]),width:1,id:t.id}),{color:ie.parseColor(t,t.paint["fill-color"],this.props.zooms[0]),id:t.id,opacity:ie.parseNumber(t,t.paint["fill-opacity"],this.props.zooms[0])}))),this.update()}},template:function(t,e,n,r){return t('<h2 expr8="expr8"> </h2><div class="render-container"><div expr9="expr9" class="render-item"></div></div>',[{redundantAttribute:"expr8",selector:"[expr8]",expressions:[{type:e.TEXT,childNodeIndex:0,evaluate:function(t){return t.props.title}},{type:e.ATTRIBUTE,name:"id",evaluate:function(t){return t.props.group}}]},{type:n.EACH,getKey:null,condition:function(t){return t.state.polygons},template:t('<canvas expr10="expr10"></canvas><span expr11="expr11"> </span>',[{redundantAttribute:"expr10",selector:"[expr10]",expressions:[{type:e.ATTRIBUTE,name:"style",evaluate:function(t){return["width: 100px; height: 100px; background-color: ",t.polygon.color,"; ",t.state.casing[t.polygon.id]?"border: "+t.state.casing[t.polygon.id].width+"px solid "+t.state.casing[t.polygon.id].color+";":""," opacity: ",t.polygon.opacity,";"].join("")}}]},{redundantAttribute:"expr11",selector:"[expr11]",expressions:[{type:e.TEXT,childNodeIndex:0,evaluate:function(t){return t.polygon.id}}]}]),redundantAttribute:"expr9",selector:"[expr9]",itemName:"polygon",indexName:null,evaluate:function(t){return t.state.polygons}}])},name:"polygon-render"},SymbolRender:{css:null,exports:{state:{casing:{},symbols:[]},onMounted(){this.state.symbols=this.props.layers.filter((t=>t.metadata&&t.metadata["taxonomy:group"]===this.props.group&&"symbol"==t.type)).map((t=>{t.paint["text-halo-color"]&&(this.state.casing[t.id]=ie.widthAndColorByZooms(t,{width:t.paint["text-halo-width"],color:t.paint["text-halo-color"],zooms:this.props.zooms}));const e=ie.widthAndColorByZooms(t,{width:t.layout["text-size"],color:t.paint["text-color"],zooms:this.props.zooms});e["text-transform"]=t.layout["text-transform"]||"none",e.example=t.metadata["taxonomy:example"];const n=ie.fonts.getProps(t.layout["text-font"][0]);return e.fontStyle=this.fontPropsToStyle(n),ie.fonts.add(n),e})),this.update()},fontPropsToStyle:t=>"font-style: "+t.style+"; font-weight: "+t.weight+"; font-family: '"+t.family+"';",getMinHeight(t){const e=8+t.maxWidth+(this.state.casing[t.id]?this.state.casing[t.id].maxWidth:0);return e>25?e:25}},template:function(t,e,n,r){return t('<h2 expr18="expr18"> </h2><div class="render-container"><div expr19="expr19" class="render-column"></div><div class="render-column"><span class="render-header">id</span><div expr23="expr23" class="render-item"></div></div></div>',[{redundantAttribute:"expr18",selector:"[expr18]",expressions:[{type:e.TEXT,childNodeIndex:0,evaluate:function(t){return t.props.title}},{type:e.ATTRIBUTE,name:"id",evaluate:function(t){return t.props.group}}]},{type:n.EACH,getKey:null,condition:null,template:t('<span expr20="expr20" class="render-header"> </span><div expr21="expr21" class="render-item"></div>',[{redundantAttribute:"expr20",selector:"[expr20]",expressions:[{type:e.TEXT,childNodeIndex:0,evaluate:function(t){return t.zoom}}]},{type:n.EACH,getKey:null,condition:function(t){return t.state.symbols},template:t('<span expr22="expr22"> </span>',[{expressions:[{type:e.ATTRIBUTE,name:"style",evaluate:function(t){return["min-height: ",t.getMinHeight(t.symbol),"px;"].join("")}}]},{redundantAttribute:"expr22",selector:"[expr22]",expressions:[{type:e.TEXT,childNodeIndex:0,evaluate:function(t){return t.symbol.example||t.symbol.id}},{type:e.ATTRIBUTE,name:"style",evaluate:function(t){return["font-size: ",t.symbol[t.zoom].width,"px; color: ",t.symbol[t.zoom].color,"; ",t.state.casing[t.symbol.id]&&t.state.casing[t.symbol.id][t.zoom]?"text-shadow: 0 0 "+t.state.casing[t.symbol.id][t.zoom].width+"px "+t.state.casing[t.symbol.id][t.zoom].color+";":""," ",t.symbol.fontStyle," text-transform: ",t.symbol["text-transform"],";"].join("")}}]}]),redundantAttribute:"expr21",selector:"[expr21]",itemName:"symbol",indexName:null,evaluate:function(t){return t.state.symbols}}]),redundantAttribute:"expr19",selector:"[expr19]",itemName:"zoom",indexName:null,evaluate:function(t){return 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",t.getMinHeight(t.line),"px;"].join("")}}]}]),redundantAttribute:"expr23",selector:"[expr23]",itemName:"line",indexName:null,evaluate:function(t){return t.state.lines}}])},name:"line-render"},PolygonRender:{css:null,exports:{state:{casing:{},polygons:[]},onMounted(){this.state.polygons=this.props.layers.filter((t=>{if(t.metadata&&t.metadata["taxonomy:group"]===this.props.group){if("fill"==t.type&&!t.metadata["taxonomy:casing"])return!0;"line"==t.type&&t.metadata["taxonomy:casing"]&&(this.state.casing[t.metadata["taxonomy:casing"]]=t)}return!1})).map((t=>(this.state.casing[t.id]?this.state.casing[t.id]={color:re.parseColor(t,this.state.casing[t.id].paint["line-color"],this.props.zooms[0]),width:re.parseNumber(t,this.state.casing[t.id].paint["line-width"],this.props.zooms[0]),id:this.state.casing[t.id].id}:t.paint["fill-outline-color"]&&(this.state.casing[t.id]={color:re.parseColor(t,t.paint["fill-outline-color"],this.props.zooms[0]),width:1,id:t.id}),{color:re.parseColor(t,t.paint["fill-color"],this.props.zooms[0]),id:t.id,opacity:re.parseNumber(t,t.paint["fill-opacity"],this.props.zooms[0])}))),this.update()}},template:function(t,e,n,r){return t('<h2 expr8="expr8"> </h2><div class="render-container"><div expr9="expr9" class="render-item"></div></div>',[{redundantAttribute:"expr8",selector:"[expr8]",expressions:[{type:e.TEXT,childNodeIndex:0,evaluate:function(t){return t.props.title}},{type:e.ATTRIBUTE,name:"id",evaluate:function(t){return t.props.group}}]},{type:n.EACH,getKey:null,condition:function(t){return t.state.polygons},template:t('<canvas expr10="expr10"></canvas><span expr11="expr11"> </span>',[{redundantAttribute:"expr10",selector:"[expr10]",expressions:[{type:e.ATTRIBUTE,name:"style",evaluate:function(t){return["width: 100px; height: 100px; background-color: ",t.polygon.color,"; ",t.state.casing[t.polygon.id]?"border: "+t.state.casing[t.polygon.id].width+"px solid "+t.state.casing[t.polygon.id].color+";":""," opacity: ",t.polygon.opacity,";"].join("")}}]},{redundantAttribute:"expr11",selector:"[expr11]",expressions:[{type:e.TEXT,childNodeIndex:0,evaluate:function(t){return t.polygon.id}}]}]),redundantAttribute:"expr9",selector:"[expr9]",itemName:"polygon",indexName:null,evaluate:function(t){return t.state.polygons}}])},name:"polygon-render"},SymbolRender:{css:null,exports:{state:{casing:{},symbols:[]},onMounted(){this.state.symbols=this.props.layers.filter((t=>t.metadata&&t.metadata["taxonomy:group"]===this.props.group&&"symbol"==t.type)).map((t=>{t.paint["text-halo-color"]&&(this.state.casing[t.id]=re.widthAndColorByZooms(t,{width:t.paint["text-halo-width"],color:t.paint["text-halo-color"],zooms:this.props.zooms}));const e=re.widthAndColorByZooms(t,{width:t.layout["text-size"],color:t.paint["text-color"],zooms:this.props.zooms});e["text-transform"]=t.layout["text-transform"]||"none",e.example=t.metadata["taxonomy:example"];const n=re.fonts.getProps(t.layout["text-font"][0]);return e.fontStyle=this.fontPropsToStyle(n),re.fonts.add(n),e})),this.update()},fontPropsToStyle:t=>"font-style: "+t.style+"; font-weight: "+t.weight+"; font-family: '"+t.family+"';",getMinHeight(t){const e=8+t.maxWidth+(this.state.casing[t.id]?this.state.casing[t.id].maxWidth:0);return e>25?e:25}},template:function(t,e,n,r){return t('<h2 expr12="expr12"> </h2><div class="render-container"><div expr13="expr13" class="render-column"></div><div class="render-column"><span class="render-header">id</span><div expr17="expr17" class="render-item"></div></div></div>',[{redundantAttribute:"expr12",selector:"[expr12]",expressions:[{type:e.TEXT,childNodeIndex:0,evaluate:function(t){return t.props.title}},{type:e.ATTRIBUTE,name:"id",evaluate:function(t){return t.props.group}}]},{type:n.EACH,getKey:null,condition:null,template:t('<span expr14="expr14" class="render-header"> </span><div expr15="expr15" class="render-item"></div>',[{redundantAttribute:"expr14",selector:"[expr14]",expressions:[{type:e.TEXT,childNodeIndex:0,evaluate:function(t){return t.zoom}}]},{type:n.EACH,getKey:null,condition:function(t){return t.state.symbols},template:t('<span expr16="expr16"> </span>',[{expressions:[{type:e.ATTRIBUTE,name:"style",evaluate:function(t){return["min-height: ",t.getMinHeight(t.symbol),"px;"].join("")}}]},{redundantAttribute:"expr16",selector:"[expr16]",expressions:[{type:e.TEXT,childNodeIndex:0,evaluate:function(t){return t.symbol.example||t.symbol.id}},{type:e.ATTRIBUTE,name:"style",evaluate:function(t){return["font-size: ",t.symbol[t.zoom].width,"px; color: ",t.symbol[t.zoom].color,"; ",t.state.casing[t.symbol.id]&&t.state.casing[t.symbol.id][t.zoom]?"text-shadow: 0 0 "+t.state.casing[t.symbol.id][t.zoom].width+"px "+t.state.casing[t.symbol.id][t.zoom].color+";":""," ",t.symbol.fontStyle," text-transform: ",t.symbol["text-transform"],";"].join("")}}]}]),redundantAttribute:"expr15",selector:"[expr15]",itemName:"symbol",indexName:null,evaluate:function(t){return t.state.symbols}}]),redundantAttribute:"expr13",selector:"[expr13]",itemName:"zoom",indexName:null,evaluate:function(t){return t.props.zooms}},{type:n.EACH,getKey:null,condition:function(t){return t.state.symbols},template:t(" ",[{expressions:[{type:e.TEXT,childNodeIndex:0,evaluate:function(t){return[t.symbol.id].join("")}},{type:e.ATTRIBUTE,name:"style",evaluate:function(t){return["min-height: ",t.getMinHeight(t.symbol),"px;"].join("")}}]}]),redundantAttribute:"expr17",selector:"[expr17]",itemName:"symbol",indexName:null,evaluate:function(t){return t.state.symbols}}])},name:"symbol-render"}},fetchStyleURL(t){var e=new XMLHttpRequest;e.addEventListener("load",(function(){switch(this.status){case 200:return t(null,JSON.parse(this.responseText));case 400:return t("You sent a bad request.");case 401:return t("You are not authorized to use this style.");case 500:return t("This server can not answer yet.")}})),e.open("GET",this.props.styleUrl),e.send()},setBackgroundColor(){var t=this.style.layers;for(var e in t)if("background"===t[e].type)return void(this.$(".container").style["background-color"]=t[e].paint["background-color"]||"#fff")},onMounted(){if(!this.props.styleUrl)return console.error("Style URL is missing");this.fetchStyleURL(((t,e)=>{if(t)return console.error("Error in fetch style");this.style=e,this.update()}))},onUpdated(){this.setBackgroundColor(),re.fonts.download();const t=location&&location.hash&&location.hash.replace("#",""),e=t&&this.$(t);e&&window.scrollTo({top:e.offsetTop,behavior:"smooth"})},taxonomy:re},template:function(t,e,n,r){return t('<div expr0="expr0" class="container"></div>',[{type:n.IF,evaluate:function(t){return t.style&&t.style.metadata},redundantAttribute:"expr0",selector:"[expr0]",template:t('<div expr1="expr1" class="taxonomy-item"></div><div expr3="expr3" class="taxonomy-item"></div><div style="font-size: 12px; text-align: center">\n      Powered by <a href="https://www.jawg.io/">Jawg<span style="color: #2999fd">Maps</span></a>. Contribute on <a href="https://github.com/jawg/taxonomy/">GitHub</a>.\n    </div>',[{type:n.IF,evaluate:function(t){return t.style.metadata["taxonomy:title"]},redundantAttribute:"expr1",selector:"[expr1]",template:t('<h1 expr2="expr2"> </h1>',[{redundantAttribute:"expr2",selector:"[expr2]",expressions:[{type:e.TEXT,childNodeIndex:0,evaluate:function(t){return t.style.metadata["taxonomy:title"]}}]}])},{type:n.EACH,getKey:null,condition:null,template:t('<line-render expr4="expr4"></line-render><polygon-render expr5="expr5"></polygon-render><symbol-render expr6="expr6"></symbol-render><annotation expr7="expr7"></annotation>',[{type:n.IF,evaluate:function(t){return"line"===t.group.type},redundantAttribute:"expr4",selector:"[expr4]",template:t(null,[{type:n.TAG,getComponent:r,evaluate:function(t){return"line-render"},slots:[],attributes:[{type:e.ATTRIBUTE,name:"layers",evaluate:function(t){return t.style.layers}},{type:e.ATTRIBUTE,name:"title",evaluate:function(t){return t.group.title}},{type:e.ATTRIBUTE,name:"group",evaluate:function(t){return t.group.id}},{type:e.ATTRIBUTE,name:"zooms",evaluate:function(t){return t.taxonomy.getZooms(t.group.zooms)}}]}])},{type:n.IF,evaluate:function(t){return"polygon"===t.group.type},redundantAttribute:"expr5",selector:"[expr5]",template:t(null,[{type:n.TAG,getComponent:r,evaluate:function(t){return"polygon-render"},slots:[],attributes:[{type:e.ATTRIBUTE,name:"layers",evaluate:function(t){return t.style.layers}},{type:e.ATTRIBUTE,name:"title",evaluate:function(t){return t.group.title}},{type:e.ATTRIBUTE,name:"group",evaluate:function(t){return t.group.id}},{type:e.ATTRIBUTE,name:"zooms",evaluate:function(t){return t.taxonomy.getZooms(t.group.zooms)}}]}])},{type:n.IF,evaluate:function(t){return"symbol"===t.group.type},redundantAttribute:"expr6",selector:"[expr6]",template:t(null,[{type:n.TAG,getComponent:r,evaluate:function(t){return"symbol-render"},slots:[],attributes:[{type:e.ATTRIBUTE,name:"layers",evaluate:function(t){return t.style.layers}},{type:e.ATTRIBUTE,name:"title",evaluate:function(t){return t.group.title}},{type:e.ATTRIBUTE,name:"group",evaluate:function(t){return t.group.id}},{type:e.ATTRIBUTE,name:"zooms",evaluate:function(t){return t.taxonomy.getZooms(t.group.zooms)}}]}])},{type:n.IF,evaluate:function(t){return"annotation"===t.group.type},redundantAttribute:"expr7",selector:"[expr7]",template:t(null,[{type:n.TAG,getComponent:r,evaluate:function(t){return"annotation"},slots:[],attributes:[{type:e.ATTRIBUTE,name:"layers",evaluate:function(t){return t.style.layers}},{type:e.ATTRIBUTE,name:"content",evaluate:function(t){return t.group.content}},{type:e.ATTRIBUTE,name:"group",evaluate:function(t){return t.group.id}},{type:e.ATTRIBUTE,name:"zooms",evaluate:function(t){return t.taxonomy.getZooms(t.group.zooms)}}]}])}]),redundantAttribute:"expr3",selector:"[expr3]",itemName:"group",indexName:null,evaluate:function(t){return t.style.metadata["taxonomy:groups"]}}])}])},name:"taxonomy"},function(t,e,n){var r=void 0===n?{}:n,i=r.slots,o=r.attributes,a=r.parentScope;return function(){for(var t=arguments.length,e=new Array(t),n=0;n<t;n++)e[n]=arguments[n];return e.reduce((function(t,e){return function(){return t(e.apply(void 0,arguments))}}))}((function(e){return e.mount(t,a)}),(function(t){return t({props:e,slots:i,attributes:o})}),Wt)(Jt)}),oe=0;oe<document.getElementsByTagName("taxonomy").length;oe++)ie(document.getElementsByTagName("taxonomy").item(oe))}();
diff --git a/example.json b/example.json
index 3a5b3cb..0462440 100644
--- a/example.json
+++ b/example.json
@@ -197,14 +197,13 @@
       "filter": [ "==", "admin_level", 2 ],
       "paint": {
         "line-color": "hsl(248, 7%, 66%)",
-        "line-width": {
-          "base": 1,
-          "stops": [
-            [ 0, 0.6 ],
-            [ 5, 2 ],
-            [ 12, 8 ]
-          ]
-        }
+        "line-width": [
+          "interpolate",
+          ["linear"],
+          ["zoom"],
+          3, 0.5,
+          10, 2
+        ]
       }
     },
     {
diff --git a/src/scripts/taxonomy.js b/src/scripts/taxonomy.js
index 0144453..23f632d 100644
--- a/src/scripts/taxonomy.js
+++ b/src/scripts/taxonomy.js
@@ -1,22 +1,8 @@
 import WebFont from 'webfontloader';
 import colorConverter from 'color-operations-ui/src/scripts/color-converter.js';
 
-class Interpolate {
+class Expressions {
   constructor() {}
-  number(a, b, t) {
-    return a * (1 - t) + b * t;
-  }
-  array(from, to, t) {
-    return from.map(function (d, i) {
-      return this.number(d, to[i], t);
-    });
-  }
-}
-
-class Stops {
-  constructor() {
-    this.interpolate = new Interpolate();
-  }
   findStopLessThanOrEqualTo(stops, input) {
     const n = stops.length;
     var lowerIndex = 0;
@@ -51,6 +37,56 @@ class Stops {
       return (Math.pow(base, progress) - 1) / (Math.pow(base, difference) - 1);
     }
   }
+  number(a, b, t) {
+    return a * (1 - t) + b * t;
+  }
+  array(from, to, t) {
+    return from.map(function(d, i) {
+      return this.number(d, to[i], t);
+    });
+  }
+  asExpression(exp) {
+    if (Array.isArray(exp)) {
+      return exp
+    }
+    if (!exp.stops) {
+      throw new Error(`${JSON.stringify(exp)} is not a correct expression`)
+    }
+    if (exp.base === 1 || exp.base === undefined) {
+      return ["interpolate", ["linear"],
+        ["zoom"]
+      ].concat(exp.stops.reduce((acc, e) => acc.concat(e), []))
+    }
+    return ["interpolate", ["exponential", exp.base],
+      ["zoom"]
+    ].concat(exp.stops.reduce((acc, e) => acc.concat(e), []))
+  }
+  parseInterpolate(exp, value) {
+    if (!exp || exp[0] !== 'interpolate' || exp.length < 4) {
+      return null
+    }
+
+    const base = exp[1][0] === "exponential" ? exp[1][1] : 1
+    const stops = exp.slice(3).reduce((acc, e, i) => {
+      i % 2 === 0 ? acc.push([e]) : acc[acc.length - 1].push(e)
+      return acc
+    }, []);
+    if (stops.length === 1 || stops[0][0] >= value) {
+      return {
+        value: stops[0][1]
+      };
+    } else if (stops[stops.length - 1][0] <= value) {
+      return {
+        value: stops[stops.length - 1][1]
+      };
+    }
+    const index = this.findStopLessThanOrEqualTo(stops, value);
+    return {
+      lower: stops[index][1],
+      upper: stops[index + 1][1],
+      t: this.interpolationFactor(value, base, stops[index][0], stops[index + 1][0])
+    }
+  }
 }
 
 class Fonts {
@@ -116,7 +152,7 @@ class Fonts {
 class Taxonomy {
   constructor() {
     this.zooms = this.generateArray(1, 20);
-    this.stops = new Stops();
+    this.expressions = new Expressions();
     this.fonts = new Fonts();
   }
   generateArray(min, max) {
@@ -147,17 +183,12 @@ class Taxonomy {
     } else if (typeof width === 'number') {
       return width;
     }
-    const stops = width.stops;
-    if (stops.length === 1 || stops[0][0] >= zoom) {
-      return stops[0][1];
-    } else if (stops[stops.length - 1][0] <= zoom) {
-      return stops[stops.length - 1][1];
+    const expression = this.expressions.asExpression(width)
+    const interpolate = this.expressions.parseInterpolate(expression, zoom)
+    if (interpolate) {
+      if (interpolate.value) return interpolate.value
+      return +this.expressions.number(interpolate.lower, interpolate.upper, interpolate.t).toFixed(2);
     }
-    const index = this.stops.findStopLessThanOrEqualTo(stops, zoom);
-    const t = this.stops.interpolationFactor(zoom, width.base, stops[index][0], stops[index + 1][0]);
-    const outputLower = stops[index][1];
-    const outputUpper = stops[index + 1][1];
-    return +this.stops.interpolate.number(outputLower, outputUpper, t).toFixed(2);
   }
   parseColor(layer, color, zoom) {
     if (
@@ -170,30 +201,27 @@ class Taxonomy {
     } else if (typeof color === 'string') {
       return color;
     }
-    const stops = color.stops;
-    if (stops.length === 1 || stops[0][0] >= zoom) {
-      return stops[0][1];
-    } else if (stops[stops.length - 1][0] <= zoom) {
-      return stops[stops.length - 1][1];
+    const expression = this.expressions.asExpression(color)
+    const interpolate = this.expressions.parseInterpolate(expression, zoom)
+    if (interpolate) {
+      if (interpolate.value) return interpolate.value
+      const typeValueLower = colorConverter.getStringTypeAndValue(interpolate.lower);
+      const typeValueUpper = colorConverter.getStringTypeAndValue(interpolate.upper);
+      const outputLower =
+        typeValueLower.type === 'rgb' ?
+        typeValueLower.value :
+        colorConverter[typeValueLower.type].rgb(typeValueLower.value);
+      const outputUpper =
+        typeValueUpper.type === 'rgb' ?
+        typeValueUpper.value :
+        colorConverter[typeValueUpper.type].rgb(typeValueUpper.value);
+      return colorConverter.rgba.toString([
+        this.expressions.number(outputLower[0], outputUpper[0], interpolate.t),
+        this.expressions.number(outputLower[1], outputUpper[1], interpolate.t),
+        this.expressions.number(outputLower[2], outputUpper[2], interpolate.t),
+        1,
+      ]);
     }
-    const index = this.stops.findStopLessThanOrEqualTo(stops, zoom);
-    const t = this.stops.interpolationFactor(zoom, color.base, stops[index][0], stops[index + 1][0]);
-    const typeValueLower = colorConverter.getStringTypeAndValue(stops[index][1]);
-    const typeValueUpper = colorConverter.getStringTypeAndValue(stops[index + 1][1]);
-    const outputLower =
-      typeValueLower.type === 'rgb'
-        ? typeValueLower.value
-        : colorConverter[typeValueLower.type].rgb(typeValueLower.value);
-    const outputUpper =
-      typeValueUpper.type === 'rgb'
-        ? typeValueUpper.value
-        : colorConverter[typeValueUpper.type].rgb(typeValueUpper.value);
-    return colorConverter.rgba.toString([
-      this.stops.interpolate.number(outputLower[0], outputUpper[0], t),
-      this.stops.interpolate.number(outputLower[1], outputUpper[1], t),
-      this.stops.interpolate.number(outputLower[2], outputUpper[2], t),
-      1,
-    ]);
   }
   renderLine(layer, zooms) {
     const line = this.widthAndColorByZooms(layer, {
@@ -231,7 +259,7 @@ class Taxonomy {
         res.maxWidth = parsedWidth;
       }
       res[zoom] = {
-        width: parsedWidth,
+        width: isNaN(parsedWidth) ? 0 : parsedWidth,
         color: this.parseColor(layer, color, zoom),
         opacity: this.parseNumber(layer, opacity, zoom),
       };
@@ -262,4 +290,4 @@ class Taxonomy {
   }
 }
 
-export default new Taxonomy();
+export default new Taxonomy();
\ No newline at end of file