geojson-to-gml-2
Version:
a package to translate geojson to gml 2.1.2
180 lines (174 loc) • 19.8 kB
JavaScript
;
Object.defineProperty(exports, '__esModule', { value: true });
/* Convert geojson into gml 2.1.2 simple features.
GML models from https://docs.oracle.com/cd/E11882_01/appdev.112/e11829/oracle/spatial/util/GML.html
*/
/**
* returns a string with the first letter capitalized.
* @function
* @private
* @param {string} str
* @returns {string} a string with the first letter capitalized.
*/
function capitalizeFirstLetter(str) {
return str.replace(/^./, letter => letter.toUpperCase());
}
/**
* returns a string with the first letter lowered.
* @function
* @private
* @param {string} str
* @returns {string} a string with the first letter lowered.
*/
function lowerFirstLetter(str) {
return str.replace(/^./, letter => letter.toLowerCase());
}
/**
* converts a geojson geometry Point to gml
* @function
* @param {number[]} coords the coordinates member of the geometry
* @param {string|undefined} srsName a string specifying SRS
* @returns {string} a string of gml describing the input geometry
*/
function Point(coords, srsName) {
return `<gml:Point${srsName ? ` srsName="${srsName}"` : ''}>` + '<gml:coordinates cs="," ts=" " decimal=".">' + coords.join() + '</gml:coordinates>' + '</gml:Point>';
}
/**
* converts a geojson geometry LineString to gml
* @function
* @param {number[][]} coords the coordinates member of the geometry
* @param {string|undefined} srsName a string specifying SRS
* @returns {string} a string of gml describing the input geometry
*/
function LineString(coords, srsName) {
return `<gml:LineString${srsName ? ` srsName="${srsName}"` : ''}>` + '<gml:coordinates cs="," ts=" " decimal=".">' + coords.join(' ') + '</gml:coordinates>' + '</gml:LineString>';
}
/**
* converts a geojson geometry ring in a polygon to gml
* @function
* @param {number[][]} coords the coordinates member of the geometry
* @param {string|undefined} srsName a string specifying SRS
* @returns {string} a string of gml describing the input geometry
*/
function LinearRing(coords, srsName) {
return `<gml:LinearRing${srsName ? ` srsName="${srsName}"` : ''}>` + '<gml:coordinates cs="," ts=" " decimal=".">' + coords.join(' ') + '</gml:coordinates>' + '</gml:LinearRing>';
}
/**
* converts a geojson geometry Polygon to gml
* @function
* @param {number[][][]} coords the coordinates member of the geometry
* @param {string|undefined} srsName a string specifying SRS
* @returns {string} a string of gml describing the input geometry
*/
function Polygon(coords, srsName) {
// geom.coordinates are arrays of LinearRings
let polygon = `<gml:Polygon${srsName ? ` srsName="${srsName}"` : ''}>` + '<gml:outerBoundaryIs>' + LinearRing(coords[0]) + '</gml:outerBoundaryIs>';
if (coords.length >= 2) {
for (let linearRing of coords.slice(1)) {
polygon += '<gml:innerBoundaryIs>' + LinearRing(linearRing) + '</gml:innerBoundaryIs>';
}
}
polygon += '</gml:Polygon>';
return polygon;
}
/**
* Handles multigeometries or geometry collections
* @function
* @param {Object} geom a geojson geometry object
* @param {string} name the name of the multigeometry, e.g. 'MultiPolygon'
* @param {string|undefined} srsName a string specifying the SRS
* @param {string} memberPrefix the prefix of a gml member tag
* @returns {string} a string of gml describing the input multigeometry
* @throws {Error} will throw an error if a member geometry is supplied without a `type` attribute
*/
function _multi(geom, name, cb, srsName, memberPrefix = '') {
let multi = `<gml:${name}${srsName ? ` srsName="${srsName}"` : ''}>`;
for (let member of geom) {
var _memberPrefix = '';
if (member.type) {
// geometryCollection: memberPrefix should be '',
memberPrefix = lowerFirstLetter(member.type);
member = member.coordinates;
}
if (!memberPrefix) {
throw 'un-typed member ' + JSON.stringify(member);
} else {
_memberPrefix = capitalizeFirstLetter(memberPrefix);
}
let inner = (cb[_memberPrefix] || cb)(member, srsName = '');
multi += `<gml:${memberPrefix}Member>${inner}</gml:${memberPrefix}Member>`;
}
multi += `</gml:${name}>`;
return multi;
}
/**
* converts a geojson geometry MultiPoint to gml
* @function
* @param {number[][]} coords the coordinates member of the geometry
* @param {string|undefined} srsName a string specifying SRS
* @returns {string} a string of gml describing the input geometry
* @see _multi
* @see Point
*/
function MultiPoint(coords, srsName) {
return _multi(coords, 'MultiPoint', Point, srsName, 'point');
}
/**
* converts a geojson geometry MultiLineString to gml
* @function
* @param {number[][][]} coords the coordinates member of the geometry
* @param {string|undefined} srsName a string specifying SRS
* @returns {string} a string of gml describing the input geometry
* @see _multi
* @see LineString
*/
function MultiLineString(coords, srsName) {
return _multi(coords, 'MultiLineString', LineString, srsName, 'lineString');
}
/**
* converts a geojson geometry MultiPolygon to gml
* @function
* @param {number[][][][]} coords the coordinates member of the geometry
* @param {string|undefined} srsName a string specifying SRS
* @returns {string} a string of gml describing the input geometry
* @see _multi
* @see Polygon
*/
function MultiPolygon(coords, srsName) {
return _multi(coords, 'MultiPolygon', Polygon, srsName, 'polygon');
}
const converter = {
Point, LineString, LinearRing, Polygon,
MultiPoint, MultiLineString, MultiPolygon, GeometryCollection
};
/**
* converts a geojson geometry GeometryCollection to gml MultiGeometry
* @function
* @param {Object[]} geoms an array of geojson geometry objects
* @param {string|undefined} srsName a string specifying SRS
* @returns {string} a string of gml describing the input GeometryCollection
* @see _multi
*/
function GeometryCollection(geoms, srsName) {
return _multi(geoms, 'MultiGeometry', converter, srsName, 'geometry');
}
/**
* Translate geojson to gml 2.1.2 for any geojson geometry type
* @function
* @param {Object} geom a geojson geometry object
* @param {string|undefined} srsName a string specifying SRS
* @returns {string} a string of gml describing the input geometry
*/
function geomToGml(geom, srsName = 'EPSG:4326') {
return converter[geom.type](geom.coordinates || geom.geometries, srsName);
}
exports.geomToGml = geomToGml;
exports.Point = Point;
exports.LineString = LineString;
exports.LinearRing = LinearRing;
exports.Polygon = Polygon;
exports.MultiPoint = MultiPoint;
exports.MultiLineString = MultiLineString;
exports.MultiPolygon = MultiPolygon;
exports.GeometryCollection = GeometryCollection;
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"file":"geomToGml-2.1.2-cjs.js","sources":["geomToGml-2.1.2-es6.js"],"sourcesContent":["/* Convert geojson into gml 2.1.2 simple features.\n GML models from https://docs.oracle.com/cd/E11882_01/appdev.112/e11829/oracle/spatial/util/GML.html\n */\n/**\n * returns a string with the first letter capitalized.\n * @function \n * @private \n * @param {string} str\n * @returns {string} a string with the first letter capitalized.\n */\nfunction capitalizeFirstLetter(str){\n  return str.replace(/^./, (letter) => letter.toUpperCase());\n}\n/**\n * returns a string with the first letter lowered.\n * @function \n * @private \n * @param {string} str\n * @returns {string} a string with the first letter lowered.\n */\nfunction lowerFirstLetter(str){\n  return str.replace(/^./, (letter)=>letter.toLowerCase());\n}\n/** \n * converts a geojson geometry Point to gml\n * @function \n * @param {number[]} coords the coordinates member of the geometry\n * @param {string|undefined} srsName a string specifying SRS\n * @returns {string} a string of gml describing the input geometry\n */\nfunction Point(coords, srsName){\n  return `<gml:Point${(srsName ? ` srsName=\"${srsName}\"` : '')}>` +\n    '<gml:coordinates cs=\",\" ts=\" \" decimal=\".\">' +\n    coords.join() +\n    '</gml:coordinates>' +\n    '</gml:Point>';\n}\n/**\n * converts a geojson geometry LineString to gml\n * @function \n * @param {number[][]} coords the coordinates member of the geometry\n * @param {string|undefined} srsName a string specifying SRS\n * @returns {string} a string of gml describing the input geometry\n */\nfunction LineString(coords, srsName){\n  return `<gml:LineString${(srsName ? ` srsName=\"${srsName}\"`:'')}>` +\n    '<gml:coordinates cs=\",\" ts=\" \" decimal=\".\">' +\n    coords.join(' ') +\n    '</gml:coordinates>' +\n    '</gml:LineString>';\n}\n/**\n * converts a geojson geometry ring in a polygon to gml\n * @function 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(coords.length >= 2){\n    for (let linearRing of coords.slice(1)){\n      polygon += '<gml:innerBoundaryIs>' +\n\tLinearRing(linearRing) + \n\t'</gml:innerBoundaryIs>';\n    }\n  }\n  polygon += '</gml:Polygon>';\n  return polygon;\n}\n/**\n * Handles multigeometries or geometry collections\n * @function\n * @param {Object} geom a geojson geometry object\n * @param {string} name the name of the multigeometry, e.g. 'MultiPolygon'\n * @param {string|undefined} srsName a string specifying the SRS\n * @param {string} memberPrefix the prefix of a gml member tag\n * @returns {string} a string of gml describing the input multigeometry\n * @throws {Error} will throw an error if a member geometry is supplied without a `type` attribute\n */\nfunction _multi(geom, name, cb, srsName, memberPrefix=''){\n  let multi = `<gml:${name}${(srsName ? ` srsName=\"${srsName}\"` : '')}>`;\n  for (let member of geom){\n    var _memberPrefix = '';\n    if (member.type){\n      // geometryCollection: memberPrefix should be '',\n      memberPrefix = lowerFirstLetter(member.type);\n      member = member.coordinates;\n    }\n    if (!memberPrefix){\n      throw 'un-typed member ' + JSON.stringify(member);\n    } else {\n      _memberPrefix = capitalizeFirstLetter(memberPrefix);\n    }\n    let inner = (cb[_memberPrefix] || cb)(member, srsName='');\n    multi += `<gml:${memberPrefix}Member>${inner}</gml:${memberPrefix}Member>`;\n  }\n  multi += `</gml:${name}>`;\n  return multi;\n}\n/**\n * converts a geojson geometry MultiPoint to gml\n * @function \n * @param {number[][]} coords the coordinates member of the geometry\n * @param {string|undefined} srsName a string specifying SRS\n * @returns {string} a string of gml describing the input geometry\n * @see _multi\n * @see Point\n */\nfunction MultiPoint(coords, srsName){\n  return _multi(coords, 'MultiPoint', Point, srsName, 'point');\n}\n/**\n * converts a geojson geometry MultiLineString to gml\n * @function \n * @param {number[][][]} 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