File: Re-add support to skip CR (`\r`) in `File::get_as_text`

This was removed in #63481, and we confirmed that it's better like this,
but we add back the possibility to strip CR as an option, to optionally
restore the previous behavior.

For performance this is done directly in `String::parse_utf8`.

Also fixes Android `FileAccess::get_line()` as this one _should_ strip CR.

Supersedes #63717.

.gitattributes

@@ -7,6 +7,8 @@ thirdparty/* linguist-vendored
 * text=auto eol=lf
 # Except for bat files, which are Windows only files
 *.bat eol=crlf
+# And some test files where the EOL matters
+*.test.txt -text
 
 # The above only works properly for Git 2.10+, so for older versions
 # we need to manually list the binary files we don't want modified.

core/core_bind.cpp

@@ -1227,13 +1227,13 @@ Vector<uint8_t> File::get_buffer(int64_t p_length) const {
 	return data;
 }
 
-String File::get_as_text() const {
+String File::get_as_text(bool p_skip_cr) const {
 	ERR_FAIL_COND_V_MSG(f.is_null(), String(), "File must be opened before use, or is lacking read-write permission.");
 
 	uint64_t original_pos = f->get_position();
 	const_cast<FileAccess *>(*f)->seek(0);
 
-	String text = f->get_as_utf8_string();
+	String text = f->get_as_utf8_string(p_skip_cr);
 
 	const_cast<FileAccess *>(*f)->seek(original_pos);
 
@@ -1430,7 +1430,7 @@ void File::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_buffer", "length"), &File::get_buffer);
 	ClassDB::bind_method(D_METHOD("get_line"), &File::get_line);
 	ClassDB::bind_method(D_METHOD("get_csv_line", "delim"), &File::get_csv_line, DEFVAL(","));
-	ClassDB::bind_method(D_METHOD("get_as_text"), &File::get_as_text);
+	ClassDB::bind_method(D_METHOD("get_as_text", "skip_cr"), &File::get_as_text, DEFVAL(false));
 	ClassDB::bind_method(D_METHOD("get_md5", "path"), &File::get_md5);
 	ClassDB::bind_method(D_METHOD("get_sha256", "path"), &File::get_sha256);
 	ClassDB::bind_method(D_METHOD("is_big_endian"), &File::is_big_endian);

core/core_bind.h

@@ -411,7 +411,7 @@ public:
 	Vector<uint8_t> get_buffer(int64_t p_length) const; // Get an array of bytes.
 	String get_line() const;
 	Vector<String> get_csv_line(const String &p_delim = ",") const;
-	String get_as_text() const;
+	String get_as_text(bool p_skip_cr = false) const;
 	String get_md5(const String &p_path) const;
 	String get_sha256(const String &p_path) const;
 

core/io/file_access.cpp

@@ -377,7 +377,7 @@ uint64_t FileAccess::get_buffer(uint8_t *p_dst, uint64_t p_length) const {
 	return i;
 }
 
-String FileAccess::get_as_utf8_string() const {
+String FileAccess::get_as_utf8_string(bool p_skip_cr) const {
 	Vector<uint8_t> sourcef;
 	uint64_t len = get_length();
 	sourcef.resize(len + 1);
@@ -388,7 +388,7 @@ String FileAccess::get_as_utf8_string() const {
 	w[len] = 0;
 
 	String s;
-	s.parse_utf8((const char *)w);
+	s.parse_utf8((const char *)w, -1, p_skip_cr);
 	return s;
 }
 

core/io/file_access.h

@@ -113,7 +113,7 @@ public:
 	virtual String get_line() const;
 	virtual String get_token() const;
 	virtual Vector<String> get_csv_line(const String &p_delim = ",") const;
-	virtual String get_as_utf8_string() const;
+	virtual String get_as_utf8_string(bool p_skip_cr = false) const;
 
 	/**
 	 * Use this for files WRITTEN in _big_ endian machines (ie, amiga/mac)

core/string/ustring.cpp

@@ -1656,7 +1656,7 @@ String String::utf8(const char *p_utf8, int p_len) {
 	return ret;
 }
 
-Error String::parse_utf8(const char *p_utf8, int p_len) {
+Error String::parse_utf8(const char *p_utf8, int p_len, bool p_skip_cr) {
 	if (!p_utf8) {
 		return ERR_INVALID_DATA;
 	}
@@ -1689,6 +1689,10 @@ Error String::parse_utf8(const char *p_utf8, int p_len) {
 			uint8_t c = *ptrtmp >= 0 ? *ptrtmp : uint8_t(256 + *ptrtmp);
 
 			if (skip == 0) {
+				if (p_skip_cr && c == '\r') {
+					ptrtmp++;
+					continue;
+				}
 				/* Determine the number of characters in sequence */
 				if ((c & 0x80) == 0) {
 					skip = 0;
@@ -1753,6 +1757,10 @@ Error String::parse_utf8(const char *p_utf8, int p_len) {
 		uint8_t c = *p_utf8 >= 0 ? *p_utf8 : uint8_t(256 + *p_utf8);
 
 		if (skip == 0) {
+			if (p_skip_cr && c == '\r') {
+				p_utf8++;
+				continue;
+			}
 			/* Determine the number of characters in sequence */
 			if ((c & 0x80) == 0) {
 				*(dst++) = c;

core/string/ustring.h

@@ -377,7 +377,7 @@ public:
 
 	CharString ascii(bool p_allow_extended = false) const;
 	CharString utf8() const;
-	Error parse_utf8(const char *p_utf8, int p_len = -1);
+	Error parse_utf8(const char *p_utf8, int p_len = -1, bool p_skip_cr = false);
 	static String utf8(const char *p_utf8, int p_len = -1);
 
 	Char16String utf16() const;

doc/classes/File.xml

@@ -115,9 +115,10 @@
 		</method>
 		<method name="get_as_text" qualifiers="const">
 			<return type="String" />
+			<argument index="0" name="skip_cr" type="bool" default="false" />
 			<description>
-				Returns the whole file as a [String].
+				Returns the whole file as a [String]. Text is interpreted as being UTF-8 encoded.
-				Text is interpreted as being UTF-8 encoded.
+				If [code]skip_cr[/code] is [code]true[/code], carriage return characters ([code]\r[/code], CR) will be ignored when parsing the UTF-8, so that only line feed characters ([code]\n[/code], LF) represent a new line (Unix convention).
 			</description>
 		</method>
 		<method name="get_buffer" qualifiers="const">

misc/scripts/file_format.sh

@@ -37,6 +37,8 @@ while IFS= read -rd '' f; do
         continue
     elif [[ "$f" == *"-so_wrap."* ]]; then
         continue
+    elif [[ "$f" == *".test.txt" ]]; then
+        continue
     fi
     # Ensure that files are UTF-8 formatted.
     recode UTF-8 "$f" 2> /dev/null

platform/android/file_access_filesystem_jandroid.cpp

@@ -29,9 +29,11 @@
 /*************************************************************************/
 
 #include "file_access_filesystem_jandroid.h"
+
 #include "core/os/os.h"
 #include "core/templates/local_vector.h"
 #include "thread_jandroid.h"
+
 #include <unistd.h>
 
 jobject FileAccessFilesystemJAndroid::file_access_handler = nullptr;
@@ -198,7 +200,7 @@ String FileAccessFilesystemJAndroid::get_line() const {
 			if (elem == '\n' || elem == '\0') {
 				// Found the end of the line
 				const_cast<FileAccessFilesystemJAndroid *>(this)->seek(start_position + line_buffer_position + 1);
-				if (result.parse_utf8((const char *)line_buffer.ptr(), line_buffer_position)) {
+				if (result.parse_utf8((const char *)line_buffer.ptr(), line_buffer_position, true)) {
 					return String();
 				}
 				return result;
@@ -206,7 +208,7 @@ String FileAccessFilesystemJAndroid::get_line() const {
 		}
 	}
 
-	if (result.parse_utf8((const char *)line_buffer.ptr(), line_buffer_position)) {
+	if (result.parse_utf8((const char *)line_buffer.ptr(), line_buffer_position, true)) {
 		return String();
 	}
 	return result;

tests/core/io/test_file_access.h

@@ -78,6 +78,29 @@ TEST_CASE("[FileAccess] CSV read") {
 	CHECK(row5[1] == "tab separated");
 	CHECK(row5[2] == "lines, good?");
 }
+
+TEST_CASE("[FileAccess] Get as UTF-8 String") {
+	Ref<FileAccess> f_lf = FileAccess::open(TestUtils::get_data_path("line_endings_lf.test.txt"), FileAccess::READ);
+	String s_lf = f_lf->get_as_utf8_string();
+	f_lf->seek(0);
+	String s_lf_nocr = f_lf->get_as_utf8_string(true);
+	CHECK(s_lf == "Hello darkness\nMy old friend\nI've come to talk\nWith you again\n");
+	CHECK(s_lf_nocr == "Hello darkness\nMy old friend\nI've come to talk\nWith you again\n");
+
+	Ref<FileAccess> f_crlf = FileAccess::open(TestUtils::get_data_path("line_endings_crlf.test.txt"), FileAccess::READ);
+	String s_crlf = f_crlf->get_as_utf8_string();
+	f_crlf->seek(0);
+	String s_crlf_nocr = f_crlf->get_as_utf8_string(true);
+	CHECK(s_crlf == "Hello darkness\r\nMy old friend\r\nI've come to talk\r\nWith you again\r\n");
+	CHECK(s_crlf_nocr == "Hello darkness\nMy old friend\nI've come to talk\nWith you again\n");
+
+	Ref<FileAccess> f_cr = FileAccess::open(TestUtils::get_data_path("line_endings_cr.test.txt"), FileAccess::READ);
+	String s_cr = f_cr->get_as_utf8_string();
+	f_cr->seek(0);
+	String s_cr_nocr = f_cr->get_as_utf8_string(true);
+	CHECK(s_cr == "Hello darkness\rMy old friend\rI've come to talk\rWith you again\r");
+	CHECK(s_cr_nocr == "Hello darknessMy old friendI've come to talkWith you again");
+}
 } // namespace TestFileAccess
 
 #endif // TEST_FILE_ACCESS_H

tests/core/string/test_string.h

@@ -152,6 +152,20 @@ TEST_CASE("[String] UTF16 with BOM") {
 	CHECK(String::utf16(cs) == s);
 }
 
+TEST_CASE("[String] UTF8 with CR") {
+	const String base = U"Hello darkness\r\nMy old friend\nI've come to talk\rWith you again";
+
+	String keep_cr;
+	Error err = keep_cr.parse_utf8(base.utf8().get_data());
+	CHECK(err == OK);
+	CHECK(keep_cr == base);
+
+	String no_cr;
+	err = no_cr.parse_utf8(base.utf8().get_data(), -1, true); // Skip CR.
+	CHECK(err == OK);
+	CHECK(no_cr == base.replace("\r", ""));
+}
+
 TEST_CASE("[String] Invalid UTF8 (non-standard)") {
 	ERR_PRINT_OFF
 	static const uint8_t u8str[] = { 0x45, 0xE3, 0x81, 0x8A, 0xE3, 0x82, 0x88, 0xE3, 0x81, 0x86, 0xF0, 0x9F, 0x8E, 0xA4, 0xF0, 0x82, 0x82, 0xAC, 0xED, 0xA0, 0x81, 0 };

tests/data/line_endings_cr.test.txt

@@ -0,0 +1 @@
+Hello darkness
My old friend
I've come to talk
With you again

tests/data/line_endings_crlf.test.txt

@@ -0,0 +1,4 @@
+Hello darkness
+My old friend
+I've come to talk
+With you again

tests/data/line_endings_lf.test.txt

@@ -0,0 +1,4 @@
+Hello darkness
+My old friend
+I've come to talk
+With you again