[Lu Song asks about executing from pathnames with chinese characters,
and whether Unicon can execute code it reads in from an input file.]
Dear Lu Song,
Unicon's system() function and its relatives seem to have a bug
executing programs with spaces in the path. Also, the Unicon VM
does not know much about multi-byte or variable-width character sets.
Depending on the chinese characters' encoding this might cause failure.
I am interested in improving Unicon's support for such character sets,
but it won't happen unless some volunteers or sponsors step forward.
The question of whether Unicon can execute data as code is also interesting.
Lisp has an "eval" function that treats data as code, and this is a
frequently requested feature. As far as I know, simple subsets of eval()
functionality have been developed for the Icon Program Library, but no
one has sat down and attempted to write a complete eval() in Unicon or
add one to the runtime library. Some features written for the monitoring
facilities could make an eval() written in Unicon more capable than what
was possible in standard Icon, and someday the load() function may be
extended to support an efficient eval() capability. But at the moment
a full-fledged "eval" function is not available.
Examples of Unicon features that make an eval() subset written in Unicon
more flexible than what was done earlier for Icon:
variable(s) : produce the variable whose string name is s
constructor(recname, fields...) : produce a record constructor
The part that is not easy about writing eval() is to actually generate
VM bytecode from the strings of source text. For simple expressions
one could write an interpreter, but for a full-fledged eval(), more is
needed, such as the ability to define new procedures. The load()
function can almost help with this, but not quite.
Clint [EMAIL PROTECTED]
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