Added Longest Palindromic Substring Tests

.glotter.yml

@@ -72,6 +72,12 @@ projects:
     acronyms:
       - "lcs"
     requires_parameters: true
+  lps:
+    words:
+      - "lps"
+    acronyms:
+      - "lps"
+    requires_parameters: true
   linearsearch:
     words:
       - "linear"

archive/g/go/lps.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+const errorMessage = "Usage: please provide a string that contains at least one palindrome"
+
+func reverse(s string) string {
+	result := ""
+	for _, v := range s {
+		result = string(v) + result
+	}
+	return result
+}
+
+func longestPalSubstr(str string) string {
+	result := ""
+
+	if len(str) < 2 || str == "" {
+		return errorMessage
+	}
+
+	for i := 1; i < len(str); i++ {
+		for j := 0; j < len(str)-i; j++ {
+			possiblePal := strings.ToLower(str[j : j+i+1])
+
+			if possiblePal == reverse(possiblePal) && len(possiblePal) > len(result) {
+				result = possiblePal
+			}
+
+		}
+	}
+
+	if len(result) == 0 {
+		result = errorMessage
+	}
+	return result
+}
+
+func printSubStr(str string, low, high int) string {
+	s := ""
+	for i := low; i <= high; i++ {
+		s = s + string(str[i])
+	}
+
+	return s
+}
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Println(errorMessage)
+	} else {
+		fmt.Println(longestPalSubstr(os.Args[1]))
+	}
+}

archive/j/javascript/lps.js

@@ -1,11 +1,14 @@
 const [, , input] = process.argv;
 
 const getLongestPalindromic = (string) => {
+  if (!string) return;
+
   let longestPal = '';
 
   for (let i = 1; i < string.length; i++) {
     for (let j = 0; j < string.length - i; j++) {
-      let possiblePal = string.substring(j, j + i + 1);
+      let possiblePal = string.substring(j, j + i + 1).toLowerCase();
+
       if (
         possiblePal === [...possiblePal].reverse().join('') &&
         possiblePal.length > longestPal.length
@@ -14,13 +17,10 @@ const getLongestPalindromic = (string) => {
     }
   }
 
-  return longestPal
-    ? `Longest Palindromic Substring is: ${longestPal}`
-    : 'No Palindromic substring present.';
+  return longestPal;
 };
 
 console.log(
-  input
-    ? getLongestPalindromic(input)
-    : 'Incorrect input provided. Program Terminated'
+  getLongestPalindromic(input) ||
+    'Usage: please provide a string that contains at least one palindrome'
 );

archive/p/python/lps.py

@@ -0,0 +1,44 @@
+import sys
+
+errorMessage = "Usage: please provide a string that contains at least one palindrome"
+
+def longestPalindrome(string):
+    longest = ""
+    string = string.lower()
+
+    centres = [len(string) - 1]
+    for diff in range(1, len(string)):
+        centres.append(centres[0] + diff)
+        centres.append(centres[0] - diff)
+
+    for centre in centres:
+        if (min(centre + 1, 2 * len(string) - 1 - centre) <= len(longest)):
+            break
+        if centre % 2 == 0:
+            left, right = (centre // 2) - 1, (centre // 2) + 1
+        else:
+            left, right = centre // 2, (centre // 2) + 1
+
+        while left >= 0 and right < len(
+                string) and string[left] == string[right]:
+            left -= 1
+            right += 1
+
+        if right - left > len(longest):
+            longest = string[left + 1:right]
+
+    return longest
+
+
+if __name__ == '__main__':
+    if (len(sys.argv) < 2):
+        print(errorMessage)
+    else:
+        string = sys.argv[1]
+        if string == "" or string == None:
+            print(errorMessage)
+        sub = longestPalindrome(string)
+        if len(sub) == 1:
+            print(errorMessage)
+        else:
+            print(sub)

runner.py

@@ -17,6 +17,7 @@ class ProjectType(Enum):
     InsertionSort = auto()
     JobSequencing = auto()
     LCS = auto()
+    LPS = auto()
     LinearSearch = auto()
     MergeSort = auto()
     MST = auto()

test/projects/test_lps.py

@@ -0,0 +1,64 @@
+import pytest
+
+from runner import ProjectType
+from glotter import project_test, project_fixture
+from test.utilities import clean_list
+
+invalid_permutations = (
+    'description,in_params,expected', [
+        (
+            'no input',
+            None,
+            'Usage: please provide a string that contains at least one palindrome'
+        ), (
+            'empty input',
+            "",
+            'Usage: please provide a string that contains at least one palindrome'
+        ), (
+            'invalid input: no palindromes',
+            "polip",
+            'Usage: please provide a string that contains at least one palindrome'
+        )
+    ]
+)
+
+valid_permutations = (
+    'description,in_params,expected', [
+        (
+            'sample input: one palindrome',
+            'racecar',
+            'racecar'
+        ), (
+            'sample input: two palindrome',
+            '"kayak mom"',
+            'kayak'
+        ), (
+            'sample input: complex palindrome',
+            '"step on no pets"',
+            'step on no pets'
+        ),
+    ]
+)
+
+
+@project_fixture(ProjectType.LPS.key)
+def lps(request):
+    request.param.build()
+    yield request.param
+    request.param.cleanup()
+
+
+@project_test(ProjectType.LPS.key)
+@pytest.mark.parametrize(valid_permutations[0], valid_permutations[1],
+                         ids=[p[0] for p in valid_permutations[1]])
+def test_lps_valid(description, in_params, expected, lps):
+    actual = lps.run(params=in_params)
+    assert actual.strip().lower() == expected
+
+
+@project_test(ProjectType.LPS.key)
+@pytest.mark.parametrize(invalid_permutations[0], invalid_permutations[1],
+                         ids=[p[0] for p in invalid_permutations[1]])
+def test_lps_invalid(description, in_params, expected, lps):
+    actual = lps.run(params=in_params)
+    assert actual.strip() == expected