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Gforth Manual

5.13.4 Interpreter Directives

These words are usually used in interpret state; typically to control which parts of a source file are processed by the text interpreter. There are only a few ANS Forth Standard words, but Gforth supplements these with a rich set of immediate control structure words to compensate for the fact that the non-immediate versions can only be used in compile state (see section 5.8 Control Structures). Typical usages:

FALSE Constant HAVE-ASSEMBLER . . HAVE-ASSEMBLER [IF] : ASSEMBLER-FEATURE ... ; [ENDIF] . . : SEE ... \ general-purpose SEE code [ HAVE-ASSEMBLER [IF] ] ... \ assembler-specific SEE code [ [ENDIF] ] ;

doc-[IF] doc-[ELSE] doc-[THEN] doc-[ENDIF]

doc-[IFDEF] doc-[IFUNDEF]

doc-[?DO] doc-[DO] doc-[FOR] doc-[LOOP] doc-[+LOOP] doc-[NEXT]

doc-[BEGIN] doc-[UNTIL] doc-[AGAIN] doc-[WHILE] doc-[REPEAT]