From 98bfb71d000741c84a63ced3a0f1955a8f7eeee1 Mon Sep 17 00:00:00 2001
From: Stefano Pigozzi <me@steffo.eu>
Date: Thu, 20 May 2021 19:48:33 +0200
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20Add=20some=20Filters?=
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---
 nest_frontend/utils/Filter.js | 62 +++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 nest_frontend/utils/Filter.js

diff --git a/nest_frontend/utils/Filter.js b/nest_frontend/utils/Filter.js
new file mode 100644
index 0000000..5551f2b
--- /dev/null
+++ b/nest_frontend/utils/Filter.js
@@ -0,0 +1,62 @@
+export class Filter {
+    constructor() {
+
+    }
+
+    exec(tweet) {
+        return true
+    }
+}
+
+export class ContainsFilter extends Filter {
+    word
+
+    constructor(word) {
+        super()
+        this.word = word.toLowerCase().trim()
+    }
+
+    exec(tweet) {
+        return tweet.content?.toLowerCase().includes(this.word)
+    }
+}
+
+export class UserFilter extends Filter {
+    user
+
+    constructor(user) {
+        super()
+        this.user = user.toLowerCase().trim().replace(/^@/, "")
+    }
+
+    exec(tweet) {
+        return tweet.poster.toLowerCase() === this.user
+    }
+}
+
+export class HasLocationFilter extends Filter {
+    hasLocation
+
+    constructor(hasLocation) {
+        super()
+        this.hasLocation = hasLocation
+    }
+
+    exec(tweet) {
+        return (tweet["location"] !== null) === this.hasLocation
+    }
+}
+
+export class HasPlaceFilter extends Filter {
+    hasPlace
+
+    constructor(hasPlace) {
+        super()
+        this.hasPlace = hasPlace
+    }
+
+    exec(tweet) {
+        return (tweet["place"] !== null) === this.hasPlace
+    }
+}
+