From ea065bb8b269528c1ada34a8bf4696f144fa5abe Mon Sep 17 00:00:00 2001
From: missinglink <insomnia@rcpt.at>
Date: Tue, 21 Jun 2022 16:40:39 +0200
Subject: [PATCH] feat(libpostal): discard parse containing single "suburb"
 label

---
 controller/libpostal.js           |  5 +++
 test/unit/controller/libpostal.js | 66 ++++++++++++++++++++++++++++++-
 2 files changed, 70 insertions(+), 1 deletion(-)

diff --git a/controller/libpostal.js b/controller/libpostal.js
index c2f7cf360..5377a3039 100644
--- a/controller/libpostal.js
+++ b/controller/libpostal.js
@@ -127,6 +127,11 @@ function patchBuggyResponses(response){
   if( response.length === 1 ){
     let first = response[0];
 
+    // libpostal classifies some airports as 'suburb'
+    // when we see a single 'suburb' label, discard it.
+    // examples: 'john f kennedy international airport', 'soho'
+    if (first.label === 'suburb') { return []; }
+
     // given only a number, libpostal will attempt to classify it.
     // if we find a single label which is entirely numeric then it's recast to the
     // libpostal label 'house', which is mapped to 'query' in our schema.
diff --git a/test/unit/controller/libpostal.js b/test/unit/controller/libpostal.js
index 1d1881649..43a78ce8d 100644
--- a/test/unit/controller/libpostal.js
+++ b/test/unit/controller/libpostal.js
@@ -770,7 +770,7 @@ module.exports.tests.bug_fixes = (test, common) => {
   test('bug fix: recast entirely numeric input - 99', t => {
     const service = (req, callback) => {
       callback(null, [{
-        'label': 'suburb',
+        'label': 'house_number',
         'value': '99'
       }]);
     };
@@ -831,6 +831,70 @@ module.exports.tests.bug_fixes = (test, common) => {
     });
   });
 
+  test('bug fix: discard single label of type "suburb"', t => {
+    const service = (req, callback) => {
+      callback(null, [{
+        'label': 'suburb',
+        'value': 'example'
+      }]);
+    };
+    const controller = libpostal(service, () => true);
+    const req = {
+      clean: {
+        text: 'example'
+      },
+      errors: []
+    };
+    controller(req, undefined, () => {
+      t.deepEquals(req, {
+        clean: {
+          text: 'example',
+          parser: 'libpostal',
+          parsed_text: {
+            // discarded
+          }
+        },
+        errors: []
+      });
+
+      t.end();
+    });
+  });
+
+  test('bug fix: do not discard "suburb" when accompanied by another label', t => {
+    const service = (req, callback) => {
+      callback(null, [{
+        'label': 'road',
+        'value': 'avenue'
+      },{
+        'label': 'suburb',
+        'value': 'example'
+      }]);
+    };
+    const controller = libpostal(service, () => true);
+    const req = {
+      clean: {
+        text: 'avenue example'
+      },
+      errors: []
+    };
+    controller(req, undefined, () => {
+      t.deepEquals(req, {
+        clean: {
+          text: 'avenue example',
+          parser: 'libpostal',
+          parsed_text: {
+            street: 'avenue',
+            neighbourhood: 'example'
+          }
+        },
+        errors: []
+      });
+
+      t.end();
+    });
+  });
+
 };
 
 module.exports.all = (tape, common) => {