path: root/src/nodejs/alternative/testgrammar

/*
 * Classic example grammar, which recognizes simple arithmetic expressions like
 * "2*(3+4)". The parser generated from this grammar then computes their value.
 */

url = object:object p1:predicate p2:predicate { var result = {object:object}; if(p1.tags != undefined) {result.tags= p1.tags} else if(p1.bbox != undefined) {result.bbox=p1.bbox;} if(p2.tags != undefined) {result.tags= p2.tags} else if(p2.bbox != undefined) {result.bbox=p2.bbox;} return result;}/ object:object p:predicate {var result={}; result.object=object; if(p.tags != undefined) {result.tags=p.tags} else {result.bbox=p.bbox} return result} / object:object { return {object:object}}

object = v:"node" {return v} / v:"way"  {return v} / v:"relation" {return v} / v:"*" {return v}



predicate = bboxpredicate / v:tagpredicate {return {tags:v}}/ childpredicate 

tagpredicate = "["keys:keys"="values:values"]" {return {keys:keys, values:values}}

childpredicate = "not(nd)"
bboxpredicate = "[bbox=" left:float "," top:float","right:float","bottom:float"]" { return {bbox:{left:left,top:top,right:right,bottom:bottom}}}

keys = key:key keys:("|" keys)+ { var result = new Array(); result.push(key); return result.concat(keys[0][1])} / key:key { var result = new Array(); result.push(key); return result}

values = value:value values:("|" values)+ { var result = new Array(); result.push(value); return result.concat(values[0][1])} / value:value { var result = new Array(); result.push(value); return result}

key = key:letter+ {return key.join("")}
value = value:letter+ {return value.join("")}
letter = "\\*" {return "*"} / "\\[" {return "["} / "\\]" {return "]" } / "\\\\" {return "\\"} / "\\|" {return "|" } / [^*|=\\\][]

//add negative values
float = m:"-"?digits:[0-9]+"."digits2:[0-9]+ { result = parseInt(digits.join(""))+parseFloat("0."+digits2.join("")); if(m == "-") {result=result*-1}; return result} / m:"-"?digits:[0-9]+ { result =  parseInt(digits.join("")); if(m == "-") {result = result*-1}; return result}