proj4/lib/parseCode.js

Proj4js is a JavaScript library to transform point coordinates from one coordinate system to another, including datum transformations.

var defs = require('./defs');
var wkt = require('./wkt');
var projStr = require('./projString');
function testObj(code){
  return typeof code === 'string';
}
function testDef(code){
  return code in defs;
}
function testWKT(code){
  var codeWords = ['GEOGCS','GEOCCS','PROJCS','LOCAL_CS'];
  return codeWords.reduce(function(a,b){
    return a+1+code.indexOf(b);
  },0);
}
function testProj(code){
  return code[0] === '+';
}
function parse(code){
  if (testObj(code)) {
    //check to see if this is a WKT string
    if (testDef(code)) {
      return defs[code];
    }
    else if (testWKT(code)) {
      return wkt(code);
    }
    else if (testProj(code)) {
      return projStr(code);
    }
  }else{
    return code;
  }
}

module.exports = parse;