1 files changed, 55 insertions, 0 deletions
diff --git a/src/background/usecases/parsers.js b/src/background/usecases/parsers.js
new file mode 100644
index 0000000..cda26c3
--- /dev/null
+++ b/src/background/usecases/parsers.js
@@ -0,0 +1,55 @@
+const trimStart = (str) => {
+  // NOTE String.trimStart is available on Firefox 61
+  return str.replace(/^\s+/, '');
+};
+
+const normalizeUrl = (keywords, searchSettings) => {
+  try {
+    return new URL(keywords).href;
+  } catch (e) {
+    if (keywords.includes('.') && !keywords.includes(' ')) {
+      return 'http://' + keywords;
+    }
+    let template = searchSettings.engines[searchSettings.default];
+    let query = keywords;
+
+    let first = trimStart(keywords).split(' ')[0];
+    if (Object.keys(searchSettings.engines).includes(first)) {
+      template = searchSettings.engines[first];
+      query = trimStart(trimStart(keywords).slice(first.length));
+    }
+    return template.replace('{}', encodeURIComponent(query));
+  }
+};
+
+const mustNumber = (v) => {
+  let num = Number(v);
+  if (isNaN(num)) {
+    throw new Error('Not number: ' + v);
+  }
+  return num;
+};
+
+const parseSetOption = (word, types) => {
+  let [key, value] = word.split('=');
+  if (value === undefined) {
+    value = !key.startsWith('no');
+    key = value ? key : key.slice(2);
+  }
+  let type = types[key];
+  if (!type) {
+    throw new Error('Unknown property: ' + key);
+  }
+  if (type === 'boolean' && typeof value !== 'boolean' ||
+       type !== 'boolean' && typeof value === 'boolean') {
+    throw new Error('Invalid argument: ' + word);
+  }
+
+  switch (type) {
+  case 'string': return [key, value];
+  case 'number': return [key, mustNumber(value)];
+  case 'boolean': return [key, value];
+  }
+};
+
+export { normalizeUrl, parseSetOption };