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ASTPrinter: add a utility to get the length of keywords or punctuators by token kinds. #7681

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Merged
merged 1 commit into from
Feb 22, 2017
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ASTPrinter: add a utility to get the length of keywords or punctuators by token kinds. #7681

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3 changes: 3 additions & 0 deletions include/swift/AST/ASTPrinter.h
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Original file line number Diff line number Diff line change
Expand Up @@ -307,6 +307,9 @@ bool printRequirementStub(ValueDecl *Requirement, DeclContext *Adopter,
/// Print a keyword or punctuator directly by its kind.
llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, tok keyword);

/// Get the length of a keyword or punctuator by its kind.
uint8_t getKeywordLen(tok keyword);

} // namespace swift

#endif // LLVM_SWIFT_AST_ASTPRINTER_H
11 changes: 11 additions & 0 deletions lib/AST/ASTPrinter.cpp
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Expand Up @@ -594,6 +594,17 @@ operator<<(llvm::raw_ostream &OS, tok keyword) {
return OS;
}

uint8_t swift::getKeywordLen(tok keyword) {
switch (keyword) {
#define KEYWORD(KW) case tok::kw_##KW: return StringRef(#KW).size();
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@rintaro rintaro Feb 22, 2017 •
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How about sizeof(#KW) - 1; or strlen(#KW)?

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@nkcsgexi nkcsgexi Feb 22, 2017

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oh, i think that would work too : )

#define POUND_KEYWORD(KW) case tok::pound_##KW: return StringRef("#"#KW).size();
#define PUNCTUATOR(PUN, TEXT) case tok::PUN: return StringRef(TEXT).size();
#include "swift/Syntax/TokenKinds.def"
default:
llvm_unreachable("unexpected keyword or punctuator kind");
}
}

ASTPrinter &operator<<(ASTPrinter &printer, tok keyword) {
SmallString<16> Buffer;
llvm::raw_svector_ostream OS(Buffer);
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