Format KML

js/format/Xml.js

@@ -0,0 +1,69 @@
+BR.Xml = {
+    // modified version of
+    // https://gist.github.com/sente/1083506#gistcomment-2254622
+    // MIT License, Copyright (c) 2016 Stuart Powers, ES6 version by Jonathan Gruber
+    pretty: function (xml, indentSize = 1) {
+        const PADDING = ' '.repeat(indentSize);
+        const newline = '\n';
+
+        // Remove all the newlines and then remove all the spaces between tags
+        xml = xml.replace(/>\s*(\r\n|\n|\r)\s*</gm, '><').replace(/>\s+</g, '><');
+        xml = xml.replace('<metadata/>', '');
+
+        // break into lines, keeping defined tags on a single line
+        const reg = /><(\/?)([\w!?][^ />]*)/g;
+        const singleLineTagList = ['trkpt', 'wpt'];
+        let lines = [];
+        let singleLineTag = null;
+        let startIndex = 0;
+        let match;
+        while ((match = reg.exec(xml)) !== null) {
+            const tag = match[2];
+            if (singleLineTag) {
+                if (singleLineTag === tag) {
+                    singleLineTag = null;
+                }
+            } else {
+                if (singleLineTagList.includes(tag)) {
+                    singleLineTag = tag;
+                }
+                let endIndex = match.index + 1;
+                lines.push(xml.substring(startIndex, endIndex));
+                startIndex = endIndex;
+            }
+        }
+        lines.push(xml.substring(startIndex));
+
+        // indent
+        const startTextEnd = /.+<\/\w[^>]*>$/;
+        const endTag = /^<\/\w/;
+        const startTag = /^<\w[^>]*[^\/]>.*$/;
+        let pad = 0;
+        lines = lines.map((node, index) => {
+            let indent = 0;
+            if (node.match(startTextEnd)) {
+                indent = 0;
+            } else if (node.match(endTag) && pad > 0) {
+                pad -= 1;
+            } else if (node.match(startTag)) {
+                indent = 1;
+            } else {
+                indent = 0;
+            }
+
+            pad += indent;
+
+            return PADDING.repeat(pad - indent) + node;
+        });
+
+        // break gpx attributes into separate lines
+        for (const [i, line] of lines.entries()) {
+            if (line.includes('<gpx ') && !line.includes(newline)) {
+                lines[i] = line.replace(/ (\w[^=" ]*=")/g, ` ${newline}${PADDING}$1`);
+                break;
+            }
+        }
+
+        return lines.join(newline);
+    },
+};