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--- ch2_4_symbols [2022/02/22 11:57] – created admin
+++ ch2_4_symbols [2025/01/29 10:08] (current) – admin
@@ Line 1: / Line 1: @@
 **//LabLISP packages and symbols//**
-Built-in LabLISP operators are represented by symbols from the base package ''LABLISP''.
+Built-in LabLISP operators are represented by symbols from the base package ''LABLISP''.\\
+Default package is the ''USER'' package, which inherits all the base package symbols.\\
+There is also ''KEYWORD'' package with 3 symbols only: ''INTERNAL'', ''EXTERNAL'', ''INHERITED''.
-Default package is the ''USER'' package, which inherits all the base package symbols.
+Symbols ''&OPTIONAL'', ''&REST'', ''&WHOLE'' and ''&BODY'' are sometimes called keywords, but they are symbols interned in base package, and they are not bound to any value.
-There is also ''KEYWORD'' package with 3 symbols only: ''INTERNAL'', ''EXTERNAL'', ''INHERITED''.
+Packages are not represented by symbols for obvious reasons. They are accessed by the name string. Several more packages are defined through the LabLispHost mechanics.
-Apart from the functions and special operators, these symbols are defined:
+Apart from the functions and special operators, these symbols are defined and bound:
 ''NIL'' and ''T'' as constants.
+''PI'' = 3.14159, is //not// defined as constant.
+''*PACKAGE*'' is the current package.
+''*ALLOW-NON-LITERAL-CONST*'' special LabLISP flag, default NIL.
+''*PRINT-SHARED*'' control printing of shared list structure, default NIL.
+Following 5 are internal processing flags, default NIL.
+''*MACROEXPAND-ONLY*''
+''*BACKQUOTE-CONTEXT*''
+''*BACKQUOTE-SPLICE*''
+''*BACKQUOTE-HARD-SPLICE*''
+''*FUNCTOR-EVAL*''