tag/*: use std::string_view instead of StringView

src/tag/ApeReplayGain.cxx

@@ -20,13 +20,15 @@
 #include "ApeReplayGain.hxx"
 #include "ApeLoader.hxx"
 #include "ReplayGainParser.hxx"
-#include "util/StringView.hxx"
+
+#include <algorithm>
+#include <string_view>
 
 #include <string.h>
 
 static bool
 replay_gain_ape_callback(unsigned long flags, const char *key,
-			 StringView _value,
+			 std::string_view _value,
 			 ReplayGainInfo &info)
 {
 	/* we only care about utf-8 text tags */
@@ -34,11 +36,10 @@ replay_gain_ape_callback(unsigned long flags, const char *key,
 		return false;
 
 	char value[16];
-	if (_value.size >= sizeof(value))
+	if (_value.size() >= sizeof(value))
 		return false;
 
-	memcpy(value, _value.data, _value.size);
-	value[_value.size] = 0;
+	*std::copy(_value.begin(), _value.end(), value) = 0;
 
 	return ParseReplayGainTag(info, key, value);
 }
@@ -50,7 +51,7 @@ replay_gain_ape_read(InputStream &is, ReplayGainInfo &info)
 
 	auto callback = [&info, &found]
 		(unsigned long flags, const char *key,
-		 StringView value) {
+		 std::string_view value) {
 		found |= replay_gain_ape_callback(flags, key,
 						  value,
 						  info);

src/tag/ApeTag.cxx

@@ -22,7 +22,6 @@
 #include "ParseName.hxx"
 #include "Table.hxx"
 #include "Handler.hxx"
-#include "util/StringView.hxx"
 #include "util/IterableSplitString.hxx"
 
 static constexpr struct tag_table ape_tags[] = {
@@ -46,7 +45,7 @@ tag_ape_name_parse(const char *name)
  */
 static bool
 tag_ape_import_item(unsigned long flags,
-		    const char *key, StringView value,
+		    const char *key, std::string_view value,
 		    TagHandler &handler) noexcept
 {
 	/* we only care about utf-8 text tags */
@@ -74,7 +73,7 @@ tag_ape_scan2(InputStream &is, TagHandler &handler)
 
 	auto callback = [&handler, &recognized]
 		(unsigned long flags, const char *key,
-		 StringView value) {
+		 std::string_view value) {
 		recognized |= tag_ape_import_item(flags, key, value, handler);
 		return true;
 	};

src/tag/Config.cxx

@@ -25,7 +25,10 @@
 #include "util/ASCII.hxx"
 #include "util/RuntimeError.hxx"
 #include "util/IterableSplitString.hxx"
-#include "util/StringView.hxx"
+#include "util/StringCompare.hxx"
+#include "util/StringStrip.hxx"
+
+using std::string_view_literals::operator""sv;
 
 void
 TagLoadConfig(const ConfigData &config)
@@ -45,12 +48,12 @@ TagLoadConfig(const ConfigData &config)
 		/* no "+-": not incremental */
 		global_tag_mask = TagMask::None();
 
-	for (StringView name : IterableSplitString(value, ',')) {
-		name.Strip();
+	for (std::string_view name : IterableSplitString(value, ',')) {
+		name = Strip(name);
 
-		if (name.SkipPrefix("+")) {
+		if (SkipPrefix(name, "+"sv)) {
 			plus = true;
-		} else if (name.SkipPrefix("-")) {
+		} else if (SkipPrefix(name, "-"sv)) {
 			plus = false;
 		}
 

src/tag/Handler.cxx

@@ -22,7 +22,6 @@
 #include "pcm/AudioFormat.hxx"
 #include "util/CharUtil.hxx"
 #include "util/StringCompare.hxx"
-#include "util/StringView.hxx"
 
 #include <algorithm>
 
@@ -64,7 +63,7 @@ NormalizeDecimal(std::string_view s)
 				  [](char ch){ return ch != '0'; });
 	auto end = std::find_if(start, s.end(),
 				[](char ch){ return !IsDigitASCII(ch); });
-	return StringView{start, end};
+	return std::string_view{start, std::size_t(std::distance(start, end))};
 }
 
 void

src/tag/IcyMetaDataParser.cxx

@@ -1,4 +1,5 @@
-/*
+/*yes
+
  * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
@@ -20,7 +21,6 @@
 #include "IcyMetaDataParser.hxx"
 #include "tag/Builder.hxx"
 #include "util/AllocatedString.hxx"
-#include "util/StringView.hxx"
 
 #include <algorithm>
 #include <cassert>
@@ -73,15 +73,14 @@ IcyMetaDataParser::Data(size_t length) noexcept
 }
 
 static void
-icy_add_item(TagBuilder &tag, TagType type, StringView value) noexcept
+icy_add_item(TagBuilder &tag, TagType type, std::string_view value) noexcept
 {
-	if (value.size >= 2 && value.front() == '\'' && value.back() == '\'') {
+	if (value.size() >= 2 && value.front() == '\'' && value.back() == '\'') {
 		/* strip the single quotes */
-		++value.data;
-		value.size -= 2;
+		value = value.substr(1, value.size() - 2);
 	}
 
-	if (value.size > 0)
+	if (!value.empty())
 		tag.AddItem(type, value);
 }
 

src/tag/Id3Picture.cxx

@@ -20,22 +20,21 @@
 #include "Id3Picture.hxx"
 #include "Handler.hxx"
 #include "util/ByteOrder.hxx"
-#include "util/StringView.hxx"
 
 #include <cstdint>
 #include <string>
 
-static StringView
+static std::string_view
 ReadString(std::span<const std::byte> &src) noexcept
 {
 	if (src.size() < 4)
-		return nullptr;
+		return {};
 
 	const size_t length = *(const PackedBE32 *)(const void *)src.data();
 	src = src.subspan(4);
 
 	if (src.size() < length)
-		return nullptr;
+		return {};
 
 	const std::string_view result{(const char *)src.data(), length};
 	src = src.subspan(length);
@@ -51,11 +50,11 @@ ScanId3Apic(std::span<const std::byte> buffer, TagHandler &handler) noexcept
 	buffer = buffer.subspan(4); /* picture type */
 
 	const auto mime_type = ReadString(buffer);
-	if (mime_type.IsNull())
+	if (mime_type.data() == nullptr)
 		return;
 
 	/* description */
-	if (ReadString(buffer).IsNull())
+	if (ReadString(buffer).data() == nullptr)
 		return;
 
 	if (buffer.size() < 20)
@@ -71,7 +70,7 @@ ScanId3Apic(std::span<const std::byte> buffer, TagHandler &handler) noexcept
 
 	const auto image = buffer.first(image_size);
 
-	// TODO: don't copy MIME type, pass StringView to TagHandler::OnPicture()
-	handler.OnPicture(std::string(mime_type.data, mime_type.size).c_str(),
+	// TODO: don't copy MIME type, pass std::string_view to TagHandler::OnPicture()
+	handler.OnPicture(std::string{mime_type}.c_str(),
 			  image);
 }

test/ReadApeTags.cxx

@@ -24,7 +24,6 @@
 #include "fs/NarrowPath.hxx"
 #include "input/InputStream.hxx"
 #include "input/LocalOpen.hxx"
-#include "util/StringView.hxx"
 #include "util/PrintException.hxx"
 
 #include <stdlib.h>
@@ -36,11 +35,12 @@
 
 static bool
 MyApeTagCallback([[maybe_unused]] unsigned long flags,
-		 const char *key, StringView value)
+		 const char *key, std::string_view value)
 {
 	if ((flags & (0x3 << 1)) == 0)
 		// UTF-8
-		printf("\"%s\"=\"%.*s\"\n", key, (int)value.size, value.data);
+		printf("\"%s\"=\"%.*s\"\n", key,
+		       (int)value.size(), value.data());
 	else
 		printf("\"%s\"=0x%lx\n", key, flags);
 	return true;

test/fuzzer/FuzzCueParser.cxx

@@ -1,6 +1,5 @@
 #include "playlist/cue/CueParser.hxx"
 #include "util/IterableSplitString.hxx"
-#include "util/StringView.hxx"
 
 extern "C" {
 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);

test/read_tags.cxx

@@ -31,7 +31,6 @@
 #include "pcm/AudioFormat.hxx"
 #include "util/ScopeExit.hxx"
 #include "util/StringBuffer.hxx"
-#include "util/StringView.hxx"
 #include "util/PrintException.hxx"
 
 #include <cassert>

test/tag/TestMixRampParser.cxx

@@ -19,7 +19,6 @@
 
 #include "tag/MixRampParser.cxx"
 #include "tag/MixRampInfo.hxx"
-#include "util/StringView.hxx"
 
 #include <gtest/gtest.h>