Translations:Development/KDevelop-PG-Qt Introduction/199/en

Inside your actions of the lexer you can use some predefined macros:

lxCURR_POS  // position in the input (some kind of iterator or pointer)
lxCURR_IDX  // index of the position in the input
            // (it is the index as presented in the input, for example: input is a QByteArray, index incrementation per byte, but the lexer may operate on 32-bit codepoints)
lxCONTINUE  // like %continue, add the current lexeme to the next token
lxLENGTH    // length of the current lexeme (as presented in the input)
lxBEGIN_POS // position of the first character of the current lexeme
lxBEGIN_IDX  // corresponding index
lxNAMED_TOKEN(⟨name⟩, ⟨type⟩) // create a variable representing named ⟨name⟩ with the token type ⟨type⟩
lxTOKEN(⟨type⟩)               // create such a variable named “token”
lxDONE      // return the token generated before
lxRETURN(X) // create a token of type X and return it
lxEOF       // create the EOF-token
lxFINISH    // create the EOF-token and return it  (will stop tokenization)
lxFAIL      // raise the tokenization error
lxSKIP      // continue with the next lexeme (do not return a token, you should not have created one before)
lxNEXT_CHR(⟨chr⟩)             // set the variable ⟨chr⟩ to the next char in the input
yytoken     // current token