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|Read a letter (class =alpha=) and return it as a lowercase letter.
|Generate codes of Atom.
|Take next =space= character from input.
|Skip zero or more white-space characters.
a sequence of blank
//0 codes if blanks are followed by a
newline or end of the input.
|Recognise a C symbol according to the‘csymf` and‘csym` code type classification provided by the C library.
|Process a floating point number.
|Code is the next non-blank (=graph=) character.
|Take all =graph= characters.
|Generate extract a number.
|Matches a Prolog variable name.
|Unify List with the remainder of the input.
|Take as few as possible tokens from the input, taking one more each time on backtracking.
|Take as many codes from the input until the next character code appears in the list EndCodes.
|Take next =white= character from input.
|Skip white space _inside_ a line.
|True if the next code is a hexdecimal digit with Weight.
|List of weights of a sequence of hexadecimal codes.
|Generate or extract an integer from a sequence of hexadecimal digits.