huesser
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85 lines
2.9 KiB
JavaScript
85 lines
2.9 KiB
JavaScript
var TOKEN_WHITESPACE = '\\s*';
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var TOKEN_SEPARATOR = '[,;\\s]*';
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var TOKEN_FLOAT = '(-?\\d+(?:\\.\\d+)?)';
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var TOKEN_DEG = TOKEN_FLOAT + TOKEN_WHITESPACE + '[°º:d]?';
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var TOKEN_MIN = TOKEN_FLOAT + TOKEN_WHITESPACE + '[\'’‘′:]';
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var TOKEN_SEC = TOKEN_FLOAT + TOKEN_WHITESPACE + '(?:"|″|’’|\'\'|”|“)?';
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var TOKEN_DMS = TOKEN_DEG + optional(TOKEN_WHITESPACE + TOKEN_MIN) + optional(TOKEN_WHITESPACE + TOKEN_SEC);
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var TOKEN_DIR = '([NSEW]?)';
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function optional(re) {
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return '(?:' + re + ')?';
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}
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function inRange(value, a, b) {
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return value >= a && value <= b;
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}
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function dmsToDec(deg, min, sec) {
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deg = parseFloat(deg);
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min = parseFloat(min) || 0;
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sec = parseFloat(sec) || 0;
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var sign = deg < 0 ? -1 : 1;
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if (!inRange(min, 0, 60)) throw new Error('Minutes out of range');
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if (!inRange(sec, 0, 60)) throw new Error('Seconds out of range');
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return (deg + sign * min / 60 + sign * sec / 3600);
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}
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function apply(deg, min, sec, cardinality, result) {
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if (typeof deg === 'undefined') return;
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var prop = 'lat', coeff = 1;
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if (cardinality === 'e' || cardinality === 'w') {
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prop = 'lon';
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}
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// 1E -> 1.0, 1W -> -1.0
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// 1N -> 1.0, 1S -> -1.0
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if (cardinality === 's') coeff = -1;
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if (cardinality === 'w') coeff = -1;
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result[prop] = coeff * dmsToDec(deg, min, sec);
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}
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function normalizeCardinality(a, b) {
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a = (a || '').toLowerCase();
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b = (b || '').toLowerCase();
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// +n, +e
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if (!a && !b) return ['n', 'e'];
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if (a && !b) return [a, a === 'n' || a === 's' ? 'e' : 'n'];
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if (!a && b) return [b === 'n' || b === 's' ? 'e' : 'n', b];
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return [a, b];
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}
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module.exports = function(input) {
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input = input.trim();
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var regExpA = new RegExp('^' + TOKEN_FLOAT + '$', 'ig');
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var regExpB = new RegExp('^' + TOKEN_FLOAT + TOKEN_SEPARATOR + TOKEN_FLOAT + '$', 'ig');
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var regExpC = new RegExp('^' + TOKEN_DMS + TOKEN_WHITESPACE + TOKEN_DIR + '(?:' + TOKEN_SEPARATOR + TOKEN_DMS + TOKEN_WHITESPACE + TOKEN_DIR + ')?$', 'ig'); // 0°W, O°N
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var regExpD = new RegExp('^' + TOKEN_DIR + TOKEN_WHITESPACE + TOKEN_DMS + '(?:' + TOKEN_SEPARATOR + TOKEN_DIR + TOKEN_WHITESPACE + TOKEN_DMS + ')?$', 'ig'); // N0, WO
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var match, cardinality;
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var result = {};
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if (match = regExpA.exec(input)) {
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return parseFloat(match[1]);
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} else if (match = regExpB.exec(input)) {
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return {
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lat: parseFloat(match[1]),
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lon: parseFloat(match[2])
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};
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} else if (match = regExpC.exec(input)) {
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cardinality = normalizeCardinality(match[4], match[8]);
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if (!match[4] && !match[5]) return dmsToDec(match[1], match[2], match[3]);
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apply(match[1], match[2], match[3], cardinality[0], result);
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apply(match[5], match[6], match[7], cardinality[1], result);
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} else if (match = regExpD.exec(input)) {
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cardinality = normalizeCardinality(match[1], match[5]);
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apply(match[2], match[3], match[4], cardinality[0], result);
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apply(match[6], match[7], match[8], cardinality[1], result);
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} else {
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throw new Error('Could not parse string: ' + input);
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}
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return result;
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};
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