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leaflet.geocsv-src.js
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leaflet.geocsv-src.js
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/*
* Copyright 2013 - GPL
* Iván Eixarch <ivan@sinanimodelucro.org>
* https://github.com/joker-x/Leaflet.geoCSV
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
L.GeoCSV = L.GeoJSON.extend({
// default values for options
options: {
titles: ['lat', 'lng', 'popup'],
latitudeTitle: 'lat',
longitudeTitle: 'lng',
fieldSeparator: ',',
lineSeparator: '\n',
decimalSeparator: '.',
lineCommentSeparator: '#',
firstLineTitles: false,
activeWKT: false,
WKTTitle: 'wkt',
debug: false
},
_propertiesNames: [],
// for performance
_re: {
spaces: /\s+/g,
notFloats: /[^0-9., -]/g,
notWord: /[^\w]/g
},
_debug: function (msg, data) {
if (this.options.debug) {
if (msg) console.log(msg);
if (data) console.log(data);
}
return data;
},
_checkOptions: function(opts) {
if (this.options.activeWKT && !opts.WKTTitle && !this.options.firstLineTitles) this._debug('WARN: WKTTitle not defined', false);
if (this.options.activeWKT && this.options.decimalSeparator != '.') this._debug('WARN: In WKT mode decimalSeparator need to be a dot', false);
if (this.options.firstLineTitles && opts.titles) this._debug('WARN: With firstLineTitles titles array not apply', false);
if (this.options.fieldSeparator.length != 1) this._debug('WARN: fieldSeparator need to be a single character', false);
if (this.options.lineSeparator.length != 1) this._debug('WARN: lineSeparator need to be a single character', false);
},
initialize: function (csv, options) {
this._propertiesNames = [];
L.Util.setOptions (this, options);
this._checkOptions(options);
L.GeoJSON.prototype.initialize.call (this, csv, options);
},
addData: function (data) {
if (typeof data === 'string') {
data = this._csv2array(data);
// read titles
if (this.options.firstLineTitles) {
this.options.titles = data[0];
data.splice(0,1);
}
// fill _propertiesNames
for (var i=0; i<this.options.titles.length; i++) {
var prop = this.options.titles[i].toLowerCase().replace(this._re.spaces,'_').replace(this._re.notWord,'');
if (prop == '' || prop == '_') prop = 'prop-'+i;
this._propertiesNames[i] = prop;
}
// convert data to JSON
data = this._csv2json(data);
}
return L.GeoJSON.prototype.addData.call (this, data);
},
getPropertyName: function (title) {
var pos = this.options.titles.indexOf(title)
, prop = '';
if (pos >= 0) prop = this._propertiesNames[pos];
return prop;
},
getPropertyTitle: function (prop) {
var pos = this._propertiesNames.indexOf(prop)
, title = '';
if (pos >= 0) title = this.options.titles[pos];
return title;
},
_csv2array: function (str) {
var arr = [];
var quote = false;
var comment = false;
for (var row = col = c = 0; c < str.length; c++) {
var cc = str[c], nc = str[c+1];
arr[row] = arr[row] || [];
arr[row][col] = arr[row][col] || '';
if (cc == this.options.lineCommentSeparator && !quote) { comment=true; continue; }
if (cc == '"' && quote && nc == '"') { arr[row][col] += cc; ++c; continue; }
if (cc == '"') { quote = !quote; continue; }
if (cc == this.options.fieldSeparator && !quote) { ++col; continue; }
if (cc == '\r' && nc == this.options.lineSeparator && !quote) { ++row; col = 0; ++c; comment=false; continue; }
if (cc == this.options.lineSeparator && !quote) { ++row; col = 0; comment=false; continue; }
if (cc == '\r' && !quote) { ++row; col = 0; comment=false; continue; }
if (!comment) arr[row][col] += cc;
}
return arr;
},
_parseWKTFeature: function (wkt) {
wkt = wkt.toUpperCase().replace(this._re.spaces,' ').trim().split('(');
var geotype = wkt[0].trim()
, groups = wkt.slice(1).join('(').split('),')
, feature = this._featureBlank()
, coordinates = [];
for (var g=0; g<groups.length; g++) {
var coordinates_group = groups[g].replace(this._re.notFloats, '').trim().split(',');
coordinates[g]=[];
for (var i=0; i<coordinates_group.length; i++) {
coordinates_group[i]=coordinates_group[i].trim().split(' ');
if (coordinates_group[i].length != 2) return feature;
var lng=parseFloat(coordinates_group[i][0]);
var lat=parseFloat(coordinates_group[i][1]);
if (isNaN(lat) || lat > 90 || lat < -90) return feature;
if (isNaN(lng) || lng > 180 || lng < -180) return feature;
if (groups.length == 1) {
coordinates[i]=[lng,lat];
} else if (geotype == 'MULTIPOINT') {
coordinates[g]=[lng, lat];
} else {
coordinates[g][i]=[lng, lat];
}
}
}
switch (geotype) {
case 'POINT':
feature["geometry"]["type"]='Point';
feature["geometry"]["coordinates"]=coordinates[0];
break;
case 'LINESTRING':
feature["geometry"]["type"]='LineString';
feature["geometry"]["coordinates"]=coordinates;
break;
case 'POLYGON':
feature["geometry"]["type"]='Polygon';
feature["geometry"]["coordinates"]=[coordinates];
break;
case 'MULTIPOINT':
feature["geometry"]["type"]='MultiPoint';
feature["geometry"]["coordinates"]=coordinates;
break;
case 'MULTILINESTRING':
feature["geometry"]["type"]='MultiLineString';
feature["geometry"]["coordinates"]=coordinates;
break;
case 'MULTIPOLYGON':
feature["geometry"]["type"]='MultiPolygon';
feature["geometry"]["coordinates"]=[coordinates];
break;
default:
this._debug('ERR: '+geotype+' not supported', false);
}
return feature;
},
_featureBlank: function() {
return {
type: "Feature",
geometry: {},
properties: {}
};
},
_csv2json: function (csv) {
var titulos = this.options.titles
, json = {
type: "FeatureCollection",
features: []
}
, incr = (this.options.firstLineTitles) ? 2 : 1;
for (var num_linea = 0; num_linea < csv.length; num_linea++) {
var campos = csv[num_linea]
, feature = this._featureBlank();
if ((campos.length == 1) && (campos[0].trim() == '')) {
this._debug("INFO: Blank or commented at line "+(num_linea+incr), campos);
continue;
}
if (campos.length != titulos.length) {
this._debug("ERR: Fields and titles don't match at line "+(num_linea+incr)+':', campos);
continue;
}
if (this.options.activeWKT) {
feature = this._parseWKTFeature(campos[titulos.indexOf(this.options.WKTTitle)]);
} else {
var lng = parseFloat(campos[titulos.indexOf(this.options.longitudeTitle)].replace(this.options.decimalSeparator, '.'))
, lat = parseFloat(campos[titulos.indexOf(this.options.latitudeTitle)].replace(this.options.decimalSeparator, '.'));
if (lng<180 && lng>-180 && lat<90 && lat>-90) {
feature["geometry"]["type"]="Point";
feature["geometry"]["coordinates"]=[lng,lat];
} else {
this._debug('ERR: Invalid LatLon pair at line '+(num_linea+incr), false);
}
}
if (feature.geometry && feature.geometry.type) {
// valid feature
for (var i=0; i<titulos.length; i++) {
if ((this.options.activeWKT && titulos[i] != this.options.WKTTitle) ||
(!this.options.activeWKT && titulos[i] != this.options.latitudeTitle && titulos[i] != this.options.longitudeTitle)) {
feature["properties"][this._propertiesNames[i]] = campos[i];
}
}
json["features"].push(feature);
} else {
this._debug('ERR: Invalid feature at line '+(num_linea+incr)+':', campos);
}
}
return this._debug('INFO: GeoJSON generated', json);
}
});
L.geoCsv = function (csv_string, options) {
return new L.GeoCSV (csv_string, options);
};