String+StringView: Add split()

libluna/include/luna/String.h

@@ -26,6 +26,8 @@ class String
 
     Result<String> substring(usize begin, usize size) const;
 
+    Result<Vector<String>> split(StringView delim) const;
+
     static Result<String> format(const String& fmt, ...);
     static Result<String> format(StringView fmt, ...);
 

libluna/include/luna/StringView.h

@@ -1,5 +1,6 @@
 #pragma once
 #include <luna/Result.h>
+#include <luna/Vector.h>
 
 class String;
 
@@ -37,6 +38,8 @@ class StringView
     bool operator==(const char* other) const;
     bool operator==(StringView other) const;
 
+    Result<Vector<String>> split(StringView delim) const;
+
     Iterator begin() const
     {
         return m_string;

libluna/src/String.cpp

@@ -75,6 +75,11 @@ Result<String> String::substring(usize begin, usize size) const
     return String { dup, size };
 }
 
+Result<Vector<String>> String::split(StringView delim) const
+{
+    return view().split(delim);
+}
+
 const char& String::operator[](usize index) const
 {
     expect(index < m_length, "index out of range");

libluna/src/StringView.cpp

@@ -46,6 +46,33 @@ bool StringView::operator==(StringView other) const
     return !strcmp(m_string, other.m_string);
 }
 
+Result<Vector<String>> StringView::split(StringView delim) const
+{
+    Vector<String> result;
+    String str;
+
+    char* copy = strndup(m_string, m_length);
+
+    char* segment = strtok(copy, delim.chars());
+    if (!segment) goto end;
+
+    str = TRY(String::from_cstring(segment));
+    TRY(result.try_append(move(str)));
+
+    while (true)
+    {
+        segment = strtok(nullptr, delim.chars());
+        if (!segment) goto end;
+
+        str = TRY(String::from_cstring(segment));
+        TRY(result.try_append(move(str)));
+    }
+
+end:
+    free_impl(copy);
+    return result;
+}
+
 Result<String> StringView::to_string()
 {
     return String::from_cstring(m_string);