85 lines
2.1 KiB
JavaScript
85 lines
2.1 KiB
JavaScript
function xml_parse(xml) {
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let result;
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let path = [];
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let tag_begin;
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let text_begin;
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for (let i = 0; i < xml.length; i++) {
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let c = xml.charAt(i);
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if (!tag_begin && c == '<') {
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if (i > text_begin && path.length) {
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let value = xml.substring(text_begin, i);
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if (!/^\s*$/.test(value)) {
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path[path.length - 1].value = value;
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}
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}
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tag_begin = i + 1;
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} else if (tag_begin && c == '>') {
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let tag = xml.substring(tag_begin, i).trim();
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if (tag.startsWith('?') && tag.endsWith('?')) {
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/* Ignore directives. */
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} else if (tag.startsWith('/')) {
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path.pop();
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} else {
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let parts = tag.split(' ');
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let attributes = {};
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for (let j = 1; j < parts.length; j++) {
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let eq = parts[j].indexOf('=');
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let value = parts[j].substring(eq + 1);
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if (value.startsWith('"') && value.endsWith('"')) {
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value = value.substring(1, value.length - 1);
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}
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attributes[parts[j].substring(0, eq)] = value;
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}
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let next = {name: parts[0], children: [], attributes: attributes};
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if (path.length) {
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path[path.length - 1].children.push(next);
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} else {
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result = next;
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}
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if (!tag.endsWith('/')) {
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path.push(next);
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}
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}
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tag_begin = undefined;
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text_begin = i + 1;
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}
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}
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return result;
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}
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function* xml_each(node, name) {
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for (let child of node.children) {
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if (child.name == name) {
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yield child;
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}
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}
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}
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export function gpx_parse(xml) {
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let result = {segments: []};
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let tree = xml_parse(xml);
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if (tree?.name == 'gpx') {
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for (let trk of xml_each(tree, 'trk')) {
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for (let trkseg of xml_each(trk, 'trkseg')) {
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let segment = [];
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for (let trkpt of xml_each(trkseg, 'trkpt')) {
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segment.push({
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lat: parseFloat(trkpt.attributes.lat),
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lon: parseFloat(trkpt.attributes.lon),
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});
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}
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result.segments.push(segment);
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}
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}
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}
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for (let metadata of xml_each(tree, 'metadata')) {
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for (let link of xml_each(metadata, 'link')) {
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result.link = link.attributes.href;
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}
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for (let time of xml_each(metadata, 'time')) {
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result.time = time.value;
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}
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}
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return result;
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}
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