[cleanup] Replace some const std::string & by std::string_view

src/include/font.h

@@ -86,7 +86,7 @@ class CFont : public gcn::Font
 	static CFont *Get(std::string_view ident);
 
 	int Height() const;
-	int Width(const std::string &text) const;
+	int Width(std::string_view text) const;
 	int Width(const int number) const;
 	bool IsLoaded() const;
 
@@ -164,7 +164,7 @@ extern void SetDefaultTextColors(const std::string &normal, const std::string &r
 /// Get the default text colors for normal and reverse text
 extern std::pair<std::string, std::string> GetDefaultTextColors();
 ///  Return the 'line' line of the string 's'.
-extern std::string GetLineFont(unsigned int line, const std::string &s, unsigned int maxlen, const CFont *font);
+extern std::string_view GetLineFont(unsigned int line, std::string_view s, unsigned int maxlen, const CFont *font);
 
 /// Get the hot key from a string
 extern int GetHotKey(const std::string &text);
@@ -204,8 +204,8 @@ class CLabel
 	int DrawReverseClip(int x, int y, std::string_view text) const;
 	int DrawReverseClip(int x, int y, int number) const;
 
-	int DrawCentered(int x, int y, const std::string &text) const;
-	int DrawReverseCentered(int x, int y, const std::string &text) const;
+	int DrawCentered(int x, int y, std::string_view text) const;
+	int DrawReverseCentered(int x, int y, std::string_view text) const;
 private:
 	template <const bool CLIP>
 	int DoDrawText(int x, int y, std::string_view text, const CFontColor *fc) const;

src/include/menus.h

@@ -32,6 +32,8 @@
 
 //@{
 
+#include <string_view>
+
 /*----------------------------------------------------------------------------
 --  Defines/Declarations
 ----------------------------------------------------------------------------*/
@@ -47,7 +49,7 @@ class ButtonStyle;
 
 /// Draw menu button
 extern void DrawUIButton(ButtonStyle *style, unsigned flags,
-						 int x, int y, const std::string &text, int player = -1);
+						 int x, int y, std::string_view text, int player = -1);
 
 /// Pre menu setup
 extern void PreMenuSetup();

src/include/util.h

@@ -35,11 +35,12 @@
 #include "filesystem.h"
 #include "stratagus.h"
 
-#include <cstdlib>
-#include <cstdint>
-#include <string>
 #include <algorithm>
+#include <cstdint>
+#include <cstdlib>
 #include <numeric>
+#include <string>
+#include <string_view>
 
 /*----------------------------------------------------------------------------
 --  Random
@@ -77,7 +78,7 @@ void clamp(T *value, T minValue, T maxValue)
 	*value = std::clamp(*value, minValue, maxValue);
 }
 
-extern uint32_t fletcher32(const std::string &content);
+extern uint32_t fletcher32(std::string_view content);
 
 /*----------------------------------------------------------------------------
 --  Strings
@@ -141,8 +142,8 @@ void SetClipboard(const std::string &str);
 --  UTF8
 ----------------------------------------------------------------------------*/
 
-int UTF8GetNext(const std::string &text, int curpos);
-int UTF8GetPrev(const std::string &text, int curpos);
+int UTF8GetNext(std::string_view text, int curpos);
+int UTF8GetPrev(std::string_view text, int curpos);
 
 void append_unicode(std::string &s, std::uint32_t unicode);
 std::string to_utf8(std::uint32_t unicode);

src/stratagus/script.cpp

@@ -1157,7 +1157,7 @@ std::string StringDescLine::eval() const
 	if (line <= 0) {
 		return std::string("");
 	}
-	return GetLineFont(line, s, maxlen, font);
+	return std::string(GetLineFont(line, s, maxlen, font));
 }
 
 std::string StringDescPlayerName::eval() const

src/stratagus/util.cpp

@@ -174,7 +174,7 @@ long isqrt(long num)
 
 // from wikipedia, simple checksumming of our lua files. only considers a subset of 7-bit
 // ascii chars to hopefully avoid issues with filesystem encodings
-uint32_t fletcher32(const std::string &content)
+uint32_t fletcher32(std::string_view content)
 {
 	std::vector<uint16_t> alphas;
 	size_t consideredChars = 0;
@@ -430,7 +430,7 @@ void SetClipboard(const std::string &str) {
 --  UTF8
 ----------------------------------------------------------------------------*/
 
-int UTF8GetPrev(const std::string &text, int curpos)
+int UTF8GetPrev(std::string_view text, int curpos)
 {
 	--curpos;
 	if (curpos < 0) {
@@ -448,7 +448,7 @@ int UTF8GetPrev(const std::string &text, int curpos)
 	return 0;
 }
 
-int UTF8GetNext(const std::string &text, int curpos)
+int UTF8GetNext(std::string_view text, int curpos)
 {
 	if (curpos >= (int)text.size()) {
 		return curpos + 1;

src/ui/popup.cpp

@@ -62,14 +62,14 @@ int CPopupContentTypeButtonInfo::GetWidth(const ButtonAction &button, int *) con
 	const std::string draw = GetDraw(this->InfoType, button);
 
 	int width = 0;
-	std::string sub;
+	std::string_view sub;
 	if (draw.length()) {
 		if (this->MaxWidth) {
 			return std::min((unsigned int)font.getWidth(draw), this->MaxWidth);
 		}
 		int i = 1;
 		while (!(sub = GetLineFont(i++, draw, 0, &font)).empty()) {
-			width = std::max(width, font.getWidth(sub));
+			width = std::max(width, font.Width(sub));
 		}
 	}
 	return width;
@@ -106,7 +106,7 @@ void CPopupContentTypeButtonInfo::Draw(int x,
 		unsigned int width = this->MaxWidth
 							 ? std::min(this->MaxWidth, popupWidth - 2 * popup.MarginX)
 							 : 0;
-		std::string sub;
+		std::string_view sub;
 		while ((sub = GetLineFont(++i, draw, width, &font)).length()) {
 			label.Draw(x, y_off, sub);
 			y_off += font.Height() + 2;
@@ -154,10 +154,10 @@ int CPopupContentTypeText::GetWidth(const ButtonAction &button, int *) const /*
 		return std::min((unsigned int)font.getWidth(this->Text), this->MaxWidth);
 	}
 	int width = 0;
-	std::string sub;
+	std::string_view sub;
 	int i = 1;
 	while (!(sub = GetLineFont(i++, this->Text, 0, &font)).empty()) {
-		width = std::max(width, font.getWidth(sub));
+		width = std::max(width, font.Width(sub));
 	}
 	return width;
 }
@@ -182,7 +182,7 @@ void CPopupContentTypeText::Draw(int x,
 {
 	const CFont &font = this->Font ? *this->Font : GetSmallFont();
 	CLabel label(font, this->TextColor, this->HighlightColor);
-	std::string sub;
+	std::string_view sub;
 	int i = 0;
 	int y_off = y;
 	unsigned int width = this->MaxWidth

src/ui/uibuttons_proc.cpp

@@ -58,7 +58,7 @@
 **  @param text   text to print on button
 */
 void DrawUIButton(ButtonStyle *style, unsigned flags, int x, int y,
-				  const std::string &text, int player)
+				  std::string_view text, int player)
 {
 	ButtonStyleProperties *p;
 

src/video/font.cpp

@@ -420,9 +420,9 @@ static int CodepageIndexFromUTF8(const char text[], const size_t len, size_t &po
 /**
 **  Get the next codepage index to render from a utf8 encoded string
 */
-static int CodepageIndexFromUTF8(const std::string &text, size_t &pos, size_t &subpos)
+static int CodepageIndexFromUTF8(std::string_view text, size_t &pos, size_t &subpos)
 {
-	return CodepageIndexFromUTF8(text.c_str(), text.size(), pos, subpos);
+	return CodepageIndexFromUTF8(text.data(), text.size(), pos, subpos);
 }
 
 int CFont::Height() const
@@ -463,7 +463,7 @@ int CFont::Width(const int number) const
 **
 **  @return      The width in pixels of the text.
 */
-int CFont::Width(const std::string &text) const
+int CFont::Width(std::string_view text) const
 {
 	int width = 0;
 	bool isformat = false;
@@ -745,14 +745,14 @@ int CLabel::DrawReverseClip(int x, int y, int number) const
 	return DoDrawText<true>(x, y, text, reverse);
 }
 
-int CLabel::DrawCentered(int x, int y, const std::string &text) const
+int CLabel::DrawCentered(int x, int y, std::string_view text) const
 {
 	int dx = font->Width(text);
 	DoDrawText<false>(x - dx / 2, y, text, normal);
 	return dx / 2;
 }
 
-int CLabel::DrawReverseCentered(int x, int y, const std::string &text) const
+int CLabel::DrawReverseCentered(int x, int y, std::string_view text) const
 {
 	int dx = font->Width(text);
 	DoDrawText<false>(x - dx / 2, y, text, reverse);
@@ -769,7 +769,7 @@ int CLabel::DrawReverseCentered(int x, int y, const std::string &text) const
 **
 **  @return computed value.
 */
-static int strchrlen(const std::string &s, char c, unsigned int maxlen, const CFont *font)
+static int strchrlen(std::string_view s, char c, unsigned int maxlen, const CFont *font)
 {
 	if (s.empty()) {
 		return 0;
@@ -813,22 +813,21 @@ static int strchrlen(const std::string &s, char c, unsigned int maxlen, const CF
 **
 **  @return computed value.
 */
-std::string GetLineFont(unsigned int line, const std::string &s, unsigned int maxlen, const CFont *font)
+std::string_view GetLineFont(unsigned int line, std::string_view s, unsigned int maxlen, const CFont *font)
 {
 	unsigned int res;
-	std::string s1 = s;
 
 	Assert(0 < line);
 
 	for (unsigned int i = 1; i < line; ++i) {
-		res = strchrlen(s1, '\n', maxlen, font);
-		if (!res || res >= s1.size()) {
+		res = strchrlen(s, '\n', maxlen, font);
+		if (!res || res >= s.size()) {
 			return "";
 		}
-		s1 = s1.substr(res + 1);
+		s = s.substr(res + 1);
 	}
-	res = strchrlen(s1, '\n', maxlen, font);
-	return s1.substr(0, res);
+	res = strchrlen(s, '\n', maxlen, font);
+	return s.substr(0, res);
 }
 
 

tests/stratagus/test_util.cpp

@@ -115,5 +115,5 @@ TEST_CASE("fletcher32")
 
 // TODO: int getopt(int argc, char *const argv[], const char *optstring);
 // TODO: std::optional<std::string> GetClipboard();
-// TODO: int UTF8GetNext(const std::string &text, int curpos);
-// TODO: int UTF8GetPrev(const std::string &text, int curpos);
+// TODO: int UTF8GetNext(std::string_view text, int curpos);
+// TODO: int UTF8GetPrev(std::string_view text, int curpos);