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| operator | has name | ||||
| Related Syntax | Related Concepts | ||||
| Summary |
Boolean
Returns true if the specified stream item has a name, and false otherwise. Replacing |
stream? stream-name indexer? (has | hasnt) name
Streams that are attached to files, referents and external functions have names. Also, the built-in stream #markup-parser can have the name "XML" or "SGML."
If the stream has a name, the name of operator can be applied to the stream item to return a string expression containing the name of the stream.
The built-in stream #main-output has a name when it has been attached to a file on the command line that has "-of" or "-aof" options.
This example illustrates the use of has name to test whether a specified stream has a name. This is done in order to avoid the error of using the name of test on a stream that does not have a name.
global stream new-output
...
do when new-output has name
do unless name of new-output = "new-out.txt"
put #error "stream new-output has unexpected name: "
put #error name of new-output
halt with 1
done
else
put #error "new-output was never opened " _
"as file or referent%n"
halt with 1
done
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Related Syntax #main-output #markup-parser external-function name of referents |
Related Concepts Streams: name tests |
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