Merge pull request #578 from ueokande/move-to-typescript

Move to TypeScript

1 files changed, 76 insertions, 0 deletions

diff --git a/src/background/usecases/filters.ts b/src/background/usecases/filters.ts
new file mode 100644
index 0000000..84a42fb
--- /dev/null
+++ b/src/background/usecases/filters.ts
@@ -0,0 +1,76 @@
+type Item = browser.history.HistoryItem;
+
+const filterHttp = (items: Item[]): Item[] => {
+  let httpsHosts = items.map(x => new URL(x.url as string))
+    .filter(x => x.protocol === 'https:')
+    .map(x => x.host);
+  let hostsSet = new Set(httpsHosts);
+
+  return items.filter((item: Item) => {
+    let url = new URL(item.url as string);
+    return url.protocol === 'https:' || !hostsSet.has(url.host);
+  });
+};
+
+const filterBlankTitle = (items: Item[]): Item[] => {
+  return items.filter(item => item.title && item.title !== '');
+};
+
+const filterByTailingSlash = (items: Item[]): Item[] => {
+  let urls = items.map(item => new URL(item.url as string));
+  let simplePaths = urls
+    .filter(url => url.hash === '' && url.search === '')
+    .map(url => url.origin + url.pathname);
+  let pathsSet = new Set(simplePaths);
+
+  return items.filter((item) => {
+    let url = new URL(item.url as string);
+    if (url.hash !== '' || url.search !== '' ||
+      url.pathname.slice(-1) !== '/') {
+      return true;
+    }
+    return !pathsSet.has(url.origin + url.pathname.slice(0, -1));
+  });
+};
+
+const filterByPathname = (items: Item[], min: number): Item[] => {
+  let hash: {[key: string]: Item} = {};
+  for (let item of items) {
+    let url = new URL(item.url as string);
+    let pathname = url.origin + url.pathname;
+    if (!hash[pathname]) {
+      hash[pathname] = item;
+    } else if ((hash[pathname].url as string).length >
+      (item.url as string).length) {
+      hash[pathname] = item;
+    }
+  }
+  let filtered = Object.values(hash);
+  if (filtered.length < min) {
+    return items;
+  }
+  return filtered;
+};
+
+const filterByOrigin = (items: Item[], min: number): Item[] => {
+  let hash: {[key: string]: Item} = {};
+  for (let item of items) {
+    let origin = new URL(item.url as string).origin;
+    if (!hash[origin]) {
+      hash[origin] = item;
+    } else if ((hash[origin].url as string).length >
+      (item.url as string).length) {
+      hash[origin] = item;
+    }
+  }
+  let filtered = Object.values(hash);
+  if (filtered.length < min) {
+    return items;
+  }
+  return filtered;
+};
+
+export {
+  filterHttp, filterBlankTitle, filterByTailingSlash,
+  filterByPathname, filterByOrigin
+};