diff options
Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 26 |
1 files changed, 24 insertions, 2 deletions
@@ -50364,7 +50364,10 @@ clause of the .code defpackage macro. The fallback package list plays a role only in three situations: one in the \*(TL parser, one in the printer, and one in the interactive -listener. +listener. Besides that, two library functions refer to it: +.code intern-fb +and +.codn find-symbol-fb . The parser situation involving the fallback list occurs when the \*(TL parser resolves an unqualified symbol token: a symbol token not carrying @@ -51004,7 +51007,7 @@ package objects. Strings are taken to be package names, which must resolve to existing packages. Symbols are reduced to strings via .codn symbol-name . -.coNP Function @ intern +.coNP Functions @ intern and @ intern-fb .synb .mets (intern < name <> [ package ]) .syne @@ -51033,6 +51036,25 @@ is created and inserted into and that symbol is returned. In this case, the package becomes the symbol's home package. +The +.code intern-fb +function is very similar to +.code intern +except that if the symbol is not found in +.meta package +then the packages listed in the fallback list of +.meta package +are searched, in order. Only these packages themselves are searched, +not their own fallback lists. If a symbol called +.meta name +is found, the search terminates and that symbol is returned. +Only if nothing is found in the fallback list will +.code intern-fb +create a new symbol and insert it into +.metn package , +exactly like +.codn intern . + .coNP Function @ unintern .synb .mets (unintern < symbol <> [ package ]) |