Merge 15596af into c88d5fa

README.md

@@ -427,6 +427,7 @@ problems from
 * [Day 427](https://github.com/vaskoz/dailycodingproblem-go/issues/861)
 * [Day 428](https://github.com/vaskoz/dailycodingproblem-go/issues/864)
 * [Day 429](https://github.com/vaskoz/dailycodingproblem-go/issues/866)
+* [Day 431](https://github.com/vaskoz/dailycodingproblem-go/issues/882)
 * [Day 433](https://github.com/vaskoz/dailycodingproblem-go/issues/879)
 * [Day 434](https://github.com/vaskoz/dailycodingproblem-go/issues/870)
 * [Day 435](https://github.com/vaskoz/dailycodingproblem-go/issues/868)

day431/problem.go

@@ -0,0 +1,55 @@
+package day431
+
+import "strings"
+
+// ValidSentences parses text and returns the valid sentences only
+// as defined by the problem.
+func ValidSentences(text string) []string {
+	sentences := make([]string, 0)
+	start := 0
+
+	spaceDelimited := strings.Split(text, " ")
+	possibleSentence := false
+
+	for i, part := range spaceDelimited {
+		runes := []rune(part)
+		if part == "" || !isValid(runes) {
+			possibleSentence = false
+			continue
+		}
+
+		if runes[0] >= 'A' && runes[0] <= 'Z' {
+			possibleSentence = true
+			start = i
+
+			continue
+		}
+
+		if last := runes[len(runes)-1]; last == '.' || last == '!' || last == '?' {
+			if possibleSentence {
+				sentences = append(sentences, strings.Join(spaceDelimited[start:i+1], " "))
+			}
+		}
+	}
+
+	return sentences
+}
+
+func isValid(runes []rune) bool {
+	first := runes[0]
+	if !((first >= 'a' && first <= 'z') || (first >= 'A' && first <= 'Z')) {
+		return false
+	} else if len(runes) == 1 {
+		return true
+	}
+
+	for i := 1; i < len(runes)-1; i++ {
+		if char := runes[i]; char < 'a' || char > 'z' {
+			return false
+		}
+	}
+
+	last := runes[len(runes)-1]
+
+	return strings.ContainsRune(",.!?;:", last) || (last >= 'a' && last <= 'z')
+}

day431/problem_test.go

@@ -0,0 +1,62 @@
+package day431
+
+import (
+	"reflect"
+	"testing"
+)
+
+// nolint
+var testcases = []struct {
+	text      string
+	sentences []string
+}{
+	{
+		"this is not valid. However, this sentence is totally valid. Is it not?",
+		[]string{
+			"However, this sentence is totally valid.",
+			"Is it not?",
+		},
+	},
+	{
+		"Numbers like 9 and extra  spaces. A bee bit me!",
+		[]string{
+			"A bee bit me!",
+		},
+	},
+	{
+		"A bee!",
+		[]string{
+			"A bee!",
+		},
+	},
+	{
+		"The colors: red, white and blue. I can not : space punctuations.",
+		[]string{
+			"The colors: red, white and blue.",
+		},
+	},
+	{
+		"I do not allow CamelCase. It is not good for anybody, right?",
+		[]string{
+			"It is not good for anybody, right?",
+		},
+	},
+}
+
+func TestValidSentences(t *testing.T) {
+	t.Parallel()
+
+	for _, tc := range testcases {
+		if result := ValidSentences(tc.text); !reflect.DeepEqual(result, tc.sentences) {
+			t.Errorf("Expected %v, got %v", tc.sentences, result)
+		}
+	}
+}
+
+func BenchmarkValidSentences(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		for _, tc := range testcases {
+			ValidSentences(tc.text)
+		}
+	}
+}