builtin: add string.trim_indent()` method (#17099)

2025-09-13 14:32:26 +03:00 · 2023-01-24 23:41:25 +04:00 · 2023-01-24 23:41:25 +04:00 · 17d65db828
commit 17d65db828
parent 5aad0db0f7
3 changed files with 244 additions and 0 deletions
--- a/vlib/builtin/string_trim_indent_test.v
+++ b/vlib/builtin/string_trim_indent_test.v
@ -0,0 +1,126 @@
+// Copyright (c) 2019-2022 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
+fn test_empty_string() {
+	assert ''.trim_indent() == ''
+}
+
+fn test_blank_string() {
+	assert '   \t'.trim_indent() == ''
+}
+
+fn test_multiline_blank_string() {
+	assert '
+	\t
+'.trim_indent() == ''
+}
+
+fn test_zero_indentation() {
+	assert 'abc
+def'.trim_indent() == 'abc\ndef'
+}
+
+fn test_zero_indentation_and_blank_first_and_last_lines() {
+	assert '
+abc
+def
+'.trim_indent() == 'abc\ndef'
+}
+
+fn test_common_case_tabbed() {
+	assert '
+		abc
+		def
+	'.trim_indent() == 'abc\ndef'
+}
+
+fn test_common_case_spaced() {
+	assert '
+        abc
+        def
+	'.trim_indent() == 'abc\ndef'
+}
+
+fn test_common_case_tabbed_with_middle_blank_like() {
+	assert '
+		abc
+
+		def
+	'.trim_indent() == 'abc\n\ndef'
+}
+
+fn test_common_case_tabbed_with_blank_first_line() {
+	assert '    \t
+		abc
+		def
+	'.trim_indent() == 'abc\ndef'
+}
+
+fn test_common_case_tabbed_with_blank_first_and_last_line() {
+	assert '    \t
+		abc
+		def
+    \t	'.trim_indent() == 'abc\ndef'
+}
+
+fn test_html() {
+	assert '
+		<!doctype html>
+		<html lang="en">
+		<head>
+		</head>
+		<body>
+			<p>
+				Hello, World!
+			</p>
+		</body>
+		</html>
+	'.trim_indent() == '<!doctype html>
+<html lang="en">
+<head>
+</head>
+<body>
+	<p>
+		Hello, World!
+	</p>
+</body>
+</html>'
+}
+
+fn test_broken_html() {
+	assert '
+		<!doctype html>
+		<html lang="en">
+		<head>
+		</head>
+	<body>
+			<p>
+				Hello, World!
+			</p>
+		</body>
+		</html>
+	'.trim_indent() == '	<!doctype html>
+	<html lang="en">
+	<head>
+	</head>
+<body>
+		<p>
+			Hello, World!
+		</p>
+	</body>
+	</html>'
+}
+
+fn test_doc_example() {
+	st := '
+     Hello there,
+     this is a string,
+     all the leading indents are removed
+     and also the first and the last lines if they are blank
+'.trim_indent()
+	assert st == 'Hello there,
+this is a string,
+all the leading indents are removed
+and also the first and the last lines if they are blank'
+}