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- const DefaultBufferLength=1024;let nextPropID=0;class Range{constructor(from,to){this.from=from;this.to=to}}class NodeProp{constructor(config={}){this.id=nextPropID++;this.perNode=!!config.perNode;this.deserialize=config.deserialize||(()=>{throw new Error("This node type doesn't define a deserialize function")})}add(match){if(this.perNode)throw new RangeError("Can't add per-node props to node types");if(typeof match!="function")match=NodeType.match(match);return type=>{let result=match(type);return result===undefined?null:[this,result]}}}NodeProp.closedBy=new NodeProp({deserialize:str=>str.split(" ")});NodeProp.openedBy=new NodeProp({deserialize:str=>str.split(" ")});NodeProp.group=new NodeProp({deserialize:str=>str.split(" ")});NodeProp.contextHash=new NodeProp({perNode:true});NodeProp.lookAhead=new NodeProp({perNode:true});NodeProp.mounted=new NodeProp({perNode:true});class MountedTree{constructor(tree,overlay,parser){this.tree=tree;this.overlay=overlay;this.parser=parser}}const noProps=Object.create(null);class NodeType{constructor(name,props,id,flags=0){this.name=name;this.props=props;this.id=id;this.flags=flags}static define(spec){let props=spec.props&&spec.props.length?Object.create(null):noProps;let flags=(spec.top?1:0)|(spec.skipped?2:0)|(spec.error?4:0)|(spec.name==null?8:0);let type=new NodeType(spec.name||"",props,spec.id,flags);if(spec.props)for(let src of spec.props){if(!Array.isArray(src))src=src(type);if(src){if(src[0].perNode)throw new RangeError("Can't store a per-node prop on a node type");props[src[0].id]=src[1]}}return type}prop(prop){return this.props[prop.id]}get isTop(){return(this.flags&1)>0}get isSkipped(){return(this.flags&2)>0}get isError(){return(this.flags&4)>0}get isAnonymous(){return(this.flags&8)>0}is(name){if(typeof name=="string"){if(this.name==name)return true;let group=this.prop(NodeProp.group);return group?group.indexOf(name)>-1:false}return this.id==name}static match(map){let direct=Object.create(null);for(let prop in map)for(let name of prop.split(" "))direct[name]=map[prop];return node=>{for(let groups=node.prop(NodeProp.group),i=-1;i<(groups?groups.length:0);i++){let found=direct[i<0?node.name:groups[i]];if(found)return found}}}}NodeType.none=new NodeType("",Object.create(null),0,8);class NodeSet{constructor(types){this.types=types;for(let i=0;i<types.length;i++)if(types[i].id!=i)throw new RangeError("Node type ids should correspond to array positions when creating a node set")}extend(...props){let newTypes=[];for(let type of this.types){let newProps=null;for(let source of props){let add=source(type);if(add){if(!newProps)newProps=Object.assign({},type.props);newProps[add[0].id]=add[1]}}newTypes.push(newProps?new NodeType(type.name,newProps,type.id,type.flags):type)}return new NodeSet(newTypes)}}const CachedNode=new WeakMap,CachedInnerNode=new WeakMap;var IterMode;(function(IterMode){IterMode[IterMode["ExcludeBuffers"]=1]="ExcludeBuffers";IterMode[IterMode["IncludeAnonymous"]=2]="IncludeAnonymous";IterMode[IterMode["IgnoreMounts"]=4]="IgnoreMounts";IterMode[IterMode["IgnoreOverlays"]=8]="IgnoreOverlays"})(IterMode||(IterMode={}));class Tree{constructor(type,children,positions,length,props){this.type=type;this.children=children;this.positions=positions;this.length=length;this.props=null;if(props&&props.length){this.props=Object.create(null);for(let[prop,value]of props)this.props[typeof prop=="number"?prop:prop.id]=value}}toString(){let mounted=this.prop(NodeProp.mounted);if(mounted&&!mounted.overlay)return mounted.tree.toString();let children="";for(let ch of this.children){let str=ch.toString();if(str){if(children)children+=",";children+=str}}return!this.type.name?children:(/\W/.test(this.type.name)&&!this.type.isError?JSON.stringify(this.type.name):this.type.name)+(children.length?"("+children+")":"")}cursor(mode=0){return new TreeCursor(this.topNode,mode)}cursorAt(pos,side=0,mode=0){let scope=CachedNode.get(this)||this.topNode;let cursor=new TreeCursor(scope);cursor.moveTo(pos,side);CachedNode.set(this,cursor._tree);return cursor}get topNode(){return new TreeNode(this,0,0,null)}
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