specifies the characters at the start and end of single-line comments. The default is "#\n" which means that single-line comments start with a '#' and continue until a '\n' (end of line).
specifies the characters which can start identifiers (the default is G_CSET_a_2_z, "_", and G_CSET_A_2_Z).
specifies the characters which can be used in identifiers, after the first character (the default is G_CSET_a_2_z, "_0123456789", G_CSET_A_2_Z, G_CSET_LATINS, G_CSET_LATINC).
specifies which characters should be skipped by the scanner (the default is the whitespace characters: space, tab, carriage-return and line-feed).
Specifies the GScanner parser configuration. Most settings can be changed during the parsing phase and will affect the lexical parsing of the next unpeeked token.