Created
August 1, 2024 03:30
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| // Uses https://gist.github.com/jnm2/73d378c5b52547728de1148d72de522a | |
| /// <summary> | |
| /// Leaves the first line alone, but removes common indentation from the remaining lines. | |
| /// </summary> | |
| public static string RemoveIndentation(string syntax) | |
| { | |
| var commonWhitespaceLength = GetCommonWhitespace(syntax).Length; | |
| return string.Create( | |
| GetTextLengthAfterRemoval(syntax, commonWhitespaceLength), | |
| (syntax, commonWhitespaceLength), | |
| static (buffer, state) => | |
| { | |
| var enumerator = new LineEnumerator(state.syntax); | |
| _ = enumerator.MoveNext(); | |
| enumerator.Current.CopyTo(buffer); | |
| buffer = buffer[enumerator.Current.Length..]; | |
| while (enumerator.MoveNext()) | |
| { | |
| var lengthToRemove = Math.Min(state.commonWhitespaceLength, enumerator.CurrentWithoutLineEnding.Length); | |
| var trimmed = enumerator.Current[lengthToRemove..]; | |
| trimmed.CopyTo(buffer); | |
| buffer = buffer[trimmed.Length..]; | |
| } | |
| }); | |
| static ReadOnlySpan<char> GetIndentationOnFirstNonWhitespaceLine(ReadOnlySpan<char> text) | |
| { | |
| var enumerator = new LineEnumerator(text); | |
| _ = enumerator.MoveNext(); | |
| while (enumerator.MoveNext()) | |
| { | |
| var line = enumerator.CurrentWithoutLineEnding; | |
| for (var charIndex = 0; charIndex < line.Length; charIndex++) | |
| { | |
| if (line[charIndex] is not ' ' and not '\t') | |
| return line[..charIndex]; | |
| } | |
| } | |
| // All lines besides the first are whitespace lines; there are no non-whitespace chars to align. | |
| return default; | |
| } | |
| static ReadOnlySpan<char> GetCommonWhitespace(ReadOnlySpan<char> text) | |
| { | |
| var commonWhitespace = GetIndentationOnFirstNonWhitespaceLine(text); | |
| if (!commonWhitespace.IsEmpty) | |
| { | |
| var enumerator = new LineEnumerator(text); | |
| _ = enumerator.MoveNext(); | |
| while (enumerator.MoveNext()) | |
| { | |
| var line = enumerator.CurrentWithoutLineEnding; | |
| for (var charIndex = 0; charIndex < Math.Min(line.Length, commonWhitespace.Length); charIndex++) | |
| { | |
| if (line[charIndex] != commonWhitespace[charIndex]) | |
| { | |
| commonWhitespace = commonWhitespace[..charIndex]; | |
| if (commonWhitespace.IsEmpty) | |
| return commonWhitespace; | |
| break; | |
| } | |
| } | |
| } | |
| } | |
| return commonWhitespace; | |
| } | |
| static int GetTextLengthAfterRemoval(ReadOnlySpan<char> text, int commonWhitespaceLength) | |
| { | |
| var length = text.Length; | |
| var enumerator = new LineEnumerator(text); | |
| _ = enumerator.MoveNext(); | |
| while (enumerator.MoveNext()) | |
| { | |
| length -= Math.Min(enumerator.CurrentWithoutLineEnding.Length, commonWhitespaceLength); | |
| } | |
| return length; | |
| } | |
| } |
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