63 lines
1.5 KiB
JavaScript
63 lines
1.5 KiB
JavaScript
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import defs from './defs';
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import wkt from 'wkt-parser';
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import projStr from './projString';
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import match from './match';
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function testObj(code){
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return typeof code === 'string';
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}
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function testDef(code){
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return code in defs;
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}
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var codeWords = ['PROJECTEDCRS', 'PROJCRS', 'GEOGCS','GEOCCS','PROJCS','LOCAL_CS', 'GEODCRS', 'GEODETICCRS', 'GEODETICDATUM', 'ENGCRS', 'ENGINEERINGCRS'];
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function testWKT(code){
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return codeWords.some(function (word) {
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return code.indexOf(word) > -1;
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});
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}
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var codes = ['3857', '900913', '3785', '102113'];
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function checkMercator(item) {
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var auth = match(item, 'authority');
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if (!auth) {
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return;
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}
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var code = match(auth, 'epsg');
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return code && codes.indexOf(code) > -1;
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}
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function checkProjStr(item) {
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var ext = match(item, 'extension');
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if (!ext) {
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return;
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}
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return match(ext, 'proj4');
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}
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function testProj(code){
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return code[0] === '+';
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}
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function parse(code){
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if (testObj(code)) {
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//check to see if this is a WKT string
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if (testDef(code)) {
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return defs[code];
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}
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if (testWKT(code)) {
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var out = wkt(code);
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// test of spetial case, due to this being a very common and often malformed
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if (checkMercator(out)) {
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return defs['EPSG:3857'];
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}
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var maybeProjStr = checkProjStr(out);
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if (maybeProjStr) {
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return projStr(maybeProjStr);
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}
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return out;
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}
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if (testProj(code)) {
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return projStr(code);
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}
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}else{
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return code;
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}
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}
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export default parse;
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