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63 lines
2.3 KiB
C
63 lines
2.3 KiB
C
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//===- llvm/Support/Unicode.h - Unicode character properties -*- C++ -*-=====//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines functions that allow querying certain properties of Unicode
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// characters.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/StringRef.h"
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namespace llvm {
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namespace sys {
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namespace unicode {
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enum ColumnWidthErrors {
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ErrorInvalidUTF8 = -2,
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ErrorNonPrintableCharacter = -1
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};
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/// Determines if a character is likely to be displayed correctly on the
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/// terminal. Exact implementation would have to depend on the specific
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/// terminal, so we define the semantic that should be suitable for generic case
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/// of a terminal capable to output Unicode characters.
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///
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/// All characters from the Unicode code point range are considered printable
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/// except for:
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/// * C0 and C1 control character ranges;
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/// * default ignorable code points as per 5.21 of
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/// http://www.unicode.org/versions/Unicode6.2.0/UnicodeStandard-6.2.pdf
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/// except for U+00AD SOFT HYPHEN, as it's actually displayed on most
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/// terminals;
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/// * format characters (category = Cf);
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/// * surrogates (category = Cs);
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/// * unassigned characters (category = Cn).
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/// \return true if the character is considered printable.
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bool isPrintable(int UCS);
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/// Gets the number of positions the UTF8-encoded \p Text is likely to occupy
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/// when output on a terminal ("character width"). This depends on the
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/// implementation of the terminal, and there's no standard definition of
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/// character width.
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///
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/// The implementation defines it in a way that is expected to be compatible
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/// with a generic Unicode-capable terminal.
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///
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/// \return Character width:
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/// * ErrorNonPrintableCharacter (-1) if \p Text contains non-printable
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/// characters (as identified by isPrintable);
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/// * 0 for each non-spacing and enclosing combining mark;
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/// * 2 for each CJK character excluding halfwidth forms;
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/// * 1 for each of the remaining characters.
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int columnWidthUTF8(StringRef Text);
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} // namespace unicode
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} // namespace sys
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} // namespace llvm
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