Add ctl string find_first_of and find_last_of

jart · Nov 1, 2024 · beb090b · beb090b
1 parent 107d335
commit beb090b
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Showing 6 changed files with 244 additions and 0 deletions.
diff --git a/ctl/string.cc b/ctl/string.cc
@@ -389,4 +389,66 @@ string::append(const ctl::string_view& s, size_t pos, size_t count) noexcept
     append(s.substr(pos, count));
 }
 
+size_t
+string::find_last_of(char c, size_t pos) const noexcept
+{
+    const char* b = data();
+    size_t n = size();
+    if (pos > n)
+        pos = n;
+    const char* p = (const char*)memrchr(b, c, pos);
+    return p ? p - b : npos;
+}
+
+size_t
+string::find_last_of(ctl::string_view set, size_t pos) const noexcept
+{
+    if (empty() || set.empty())
+        return npos;
+    bool lut[256] = {};
+    for (char c : set)
+        lut[c & 255] = true;
+    const char* b = data();
+    size_t last = size() - 1;
+    if (pos > last)
+        pos = last;
+    for (;;) {
+        if (lut[b[pos] & 255])
+            return pos;
+        if (!pos)
+            return npos;
+        --pos;
+    }
+}
+
+size_t
+string::find_first_of(char c, size_t pos) const noexcept
+{
+    size_t n = size();
+    if (pos >= n)
+        return npos;
+    const char* b = data();
+    const char* p = (const char*)memchr(b + pos, c, n - pos);
+    return p ? p - b : npos;
+}
+
+size_t
+string::find_first_of(ctl::string_view set, size_t pos) const noexcept
+{
+    if (set.empty())
+        return npos;
+    bool lut[256] = {};
+    for (char c : set)
+        lut[c & 255] = true;
+    const char* b = data();
+    size_t n = size();
+    for (;;) {
+        if (pos >= n)
+            return npos;
+        if (lut[b[pos] & 255])
+            return pos;
+        ++pos;
+    }
+}
+
 } // namespace ctl
diff --git a/ctl/string.h b/ctl/string.h
@@ -137,6 +137,10 @@ class string
     bool starts_with(ctl::string_view) const noexcept;
     size_t find(char, size_t = 0) const noexcept;
     size_t find(ctl::string_view, size_t = 0) const noexcept;
+    size_t find_first_of(char, size_t = 0) const noexcept;
+    size_t find_first_of(ctl::string_view, size_t = 0) const noexcept;
+    size_t find_last_of(char, size_t = npos) const noexcept;
+    size_t find_last_of(ctl::string_view, size_t = npos) const noexcept;
 
     void swap(string& s) noexcept
     {

diff --git a/ctl/string_view.cc b/ctl/string_view.cc
@@ -108,4 +108,66 @@ string_view::starts_with(const string_view s) const noexcept
     return !memcmp(p, s.p, s.n);
 }
 
+size_t
+string_view::find_last_of(char c, size_t pos) const noexcept
+{
+    const char* b = data();
+    size_t n = size();
+    if (pos > n)
+        pos = n;
+    const char* p = (const char*)memrchr(b, c, pos);
+    return p ? p - b : npos;
+}
+
+size_t
+string_view::find_last_of(ctl::string_view set, size_t pos) const noexcept
+{
+    if (empty() || set.empty())
+        return npos;
+    bool lut[256] = {};
+    for (char c : set)
+        lut[c & 255] = true;
+    const char* b = data();
+    size_t last = size() - 1;
+    if (pos > last)
+        pos = last;
+    for (;;) {
+        if (lut[b[pos] & 255])
+            return pos;
+        if (!pos)
+            return npos;
+        --pos;
+    }
+}
+
+size_t
+string_view::find_first_of(char c, size_t pos) const noexcept
+{
+    size_t n = size();
+    if (pos >= n)
+        return npos;
+    const char* b = data();
+    const char* p = (const char*)memchr(b + pos, c, n - pos);
+    return p ? p - b : npos;
+}
+
+size_t
+string_view::find_first_of(ctl::string_view set, size_t pos) const noexcept
+{
+    if (set.empty())
+        return npos;
+    bool lut[256] = {};
+    for (char c : set)
+        lut[c & 255] = true;
+    const char* b = data();
+    size_t n = size();
+    for (;;) {
+        if (pos >= n)
+            return npos;
+        if (lut[b[pos] & 255])
+            return pos;
+        ++pos;
+    }
+}
+
 } // namespace ctl
diff --git a/ctl/string_view.h b/ctl/string_view.h
@@ -45,6 +45,10 @@ struct string_view
     string_view substr(size_t = 0, size_t = npos) const noexcept;
     size_t find(char, size_t = 0) const noexcept;
     size_t find(string_view, size_t = 0) const noexcept;
+    size_t find_first_of(char, size_t = 0) const noexcept;
+    size_t find_first_of(ctl::string_view, size_t = 0) const noexcept;
+    size_t find_last_of(char, size_t = npos) const noexcept;
+    size_t find_last_of(ctl::string_view, size_t = npos) const noexcept;
 
     constexpr string_view& operator=(const string_view s) noexcept
     {

diff --git a/test/ctl/string_test.cc b/test/ctl/string_test.cc
@@ -412,5 +412,61 @@ main()
             return 107;
     }
 
+    {
+        String s = "ee";
+        if (s.find_last_of('E') != String::npos)
+            return 108;
+        if (s.find_last_of('e') != 1)
+            return 109;
+    }
+
+    {
+        String e = "";
+        String s = "ee";
+        if (e.find_last_of("") != String::npos)
+            return 110;
+        if (s.find_last_of("") != String::npos)
+            return 111;
+        if (s.find_last_of("AE") != String::npos)
+            return 112;
+        if (s.find_last_of("ae") != 1)
+            return 113;
+        if (s.find_last_of("ae", 1) != 1)
+            return 114;
+        if (s.find_last_of("ae", 0) != 0)
+            return 115;
+        if (s.find_last_of("ae", 10) != 1)
+            return 116;
+    }
+
+    {
+        String s = "ee";
+        if (s.find_first_of('E') != String::npos)
+            return 117;
+        if (s.find_first_of('e') != 0)
+            return 118;
+        if (s.find_first_of('e', 1) != 1)
+            return 119;
+    }
+
+    {
+        String e = "";
+        String s = "ee";
+        if (e.find_first_of("") != String::npos)
+            return 120;
+        if (s.find_first_of("") != String::npos)
+            return 121;
+        if (s.find_first_of("AE") != String::npos)
+            return 122;
+        if (s.find_first_of("ae") != 0)
+            return 123;
+        if (s.find_first_of("ae", 1) != 1)
+            return 124;
+        if (s.find_first_of("ae", 0) != 0)
+            return 125;
+        if (s.find_first_of("ae", 10) != String::npos)
+            return 126;
+    }
+
     CheckForMemoryLeaks();
 }
diff --git a/test/ctl/string_view_test.cc b/test/ctl/string_view_test.cc
@@ -182,5 +182,61 @@ main(int argc, char* argv[])
             return 2;
     }
 
+    {
+        ctl::string_view s = "ee";
+        if (s.find_last_of('E') != ctl::string_view::npos)
+            return 108;
+        if (s.find_last_of('e') != 1)
+            return 109;
+    }
+
+    {
+        ctl::string_view e = "";
+        ctl::string_view s = "ee";
+        if (e.find_last_of("") != ctl::string_view::npos)
+            return 110;
+        if (s.find_last_of("") != ctl::string_view::npos)
+            return 111;
+        if (s.find_last_of("AE") != ctl::string_view::npos)
+            return 112;
+        if (s.find_last_of("ae") != 1)
+            return 113;
+        if (s.find_last_of("ae", 1) != 1)
+            return 114;
+        if (s.find_last_of("ae", 0) != 0)
+            return 115;
+        if (s.find_last_of("ae", 10) != 1)
+            return 116;
+    }
+
+    {
+        ctl::string_view s = "ee";
+        if (s.find_first_of('E') != ctl::string_view::npos)
+            return 117;
+        if (s.find_first_of('e') != 0)
+            return 118;
+        if (s.find_first_of('e', 1) != 1)
+            return 119;
+    }
+
+    {
+        ctl::string_view e = "";
+        ctl::string_view s = "ee";
+        if (e.find_first_of("") != ctl::string_view::npos)
+            return 120;
+        if (s.find_first_of("") != ctl::string_view::npos)
+            return 121;
+        if (s.find_first_of("AE") != ctl::string_view::npos)
+            return 122;
+        if (s.find_first_of("ae") != 0)
+            return 123;
+        if (s.find_first_of("ae", 1) != 1)
+            return 124;
+        if (s.find_first_of("ae", 0) != 0)
+            return 125;
+        if (s.find_first_of("ae", 10) != ctl::string_view::npos)
+            return 126;
+    }
+
     CheckForMemoryLeaks();
 }