Lexer class
#include <slang/parsing/Lexer.h>
The Lexer is responsible for taking source text and chopping it up into tokens.
Tokens carry along leading "trivia", which is things like whitespace and comments, so that we can programmatically piece back together what the original file looked like.
There are also helper methods on this class that handle token manipulation on the character level.
Public static functions
- static auto concatenateTokens(BumpAllocator& alloc, SourceManager& sourceManager, Token left, Token right) -> Token
- Concatenates two tokens together; used for macro pasting.
-
static auto stringify(Lexer& parentLexer,
Token startToken,
std::
span<Token> bodyTokens, Token endToken) -> Token - Converts a range of tokens into a string literal; used for macro stringification.
-
static auto commentify(BumpAllocator& alloc,
SourceManager& sourceManager,
std::
span<Token> tokens) -> Trivia - Converts a range of tokens into a block comment; used for macro expansion.
-
static void splitTokens(BumpAllocator& alloc,
Diagnostics& diagnostics,
SourceManager& sourceManager,
Token sourceToken,
size_
t offset, KeywordVersion keywordVersion, SmallVectorBase<Token>& results) - Splits the given token at the specified offset into its raw source text.
Public functions
- auto lex() -> Token
- Lexes the next token from the source code.
- auto isNextTokenOnSameLine() -> bool
- Looks ahead in the source stream to see if the next token we would lex is on the same line as the previous token we've lexed.
-
auto lexEncodedText(ProtectEncoding encoding,
uint32_
t expectedBytes, bool singleLine, bool legacyProtectedMode) -> Token - Lexes a token that contains encoded text as part of a protected envelope.
- auto getLibrary() const -> const SourceLibrary*
- Returns the library with which the lexer's source buffer is associated.
Function documentation
static void slang::
Splits the given token at the specified offset into its raw source text.
The trailing portion of the split is lexed into new tokens and appened to results