Extending and Embedding Perl in Objective-C

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Extending and Embedding Perl
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svcatpvn(SV*, char*, int len) svcatsv(SV* A, SV* B) sv_setref_iv(SV* rv, char *classname, int value) sv_setref_nv(SV* rv, char *classname, double value) sv_setref_pv(SV* rv, char *classname, char* value) svREFCNT_dec(SV*)
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Copies len characters from the string, appending them to the SV Concatenates the SV B to the end of SV A Creates a new IV with the value of value, and points rv to it If classname is non-null, then it blesses rv into that package Creates a new NV with the value of value, and points rv to it If classname is non-null, then it blesses rv into that package Creates a new PV with the value of value, and points rv to it If classname is non-null, then it blesses rv into that package Decrements the reference count for SV, calling sv_free if the count is 0
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SV* sv_bless(SV *rv, HV* stash) Blesses rv within the package represented by stash int sv_isa(SV*, char *pkgname) int sv_isobject(SV*) SV* sv_newmortal() SV* sv_2mortal(SV*) SV* sv_mortalcopy(SV*) Returns 1 if the SV inherits from the class pkgname Returns 1 if the SV is an object Creates a new blank mortal SV See the section Mortals Marks an existing SV as mortal See the section Mortals Duplicates an existing SV and makes the duplicate mortal See the section Mortals
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SV* perl_get_sv( char *varname, Gets the variable name within a Perl script int create) specified by varname, which should be a fully qualified reference If create is set to 1, then it creates a new scalar variable of that name sv_dump(SV*) Table 20-2 Pretty-prints a Perl variable (SV, AV, HV, etc)
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Functions for Accessing and Using SVs (continued)
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Perl: The Complete Reference
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Accessing Perl Variables by Name The perl_get_sv function obtains an SV by its fully qualified name within the script For example, to get the value of $foo in the main package:
SV *foo = perl_get_sv("main::foo",0);
There shouldn t be any need to create a variable of a specified name using this function, although it is possible If you want to pass information back to a Perl script, you should probably be using return values from a function anyway
Array Values
An array is just a sequential list of scalar values This is stored within Perl as an array of pointers to SVs Entries in an AV can be referenced with an index, and adding new entries beyond the current maximum index number automatically increases the size of the AV The functions for accessing AVs are summarized in Table 20-3
Function/Macro
AV* newAV() AV* av_make(int num, SV **ptr) I32 av_len(AV*)
Description
Creates a new, empty AV Creates a new AV populated with the SVs contained in **ptr Returns the highest index of the array Note that this is not the number of elements in the array; indexes start at 0, so the value is equivalent to scalar(@array) 1, or $#array Returns a pointer to the SV at location index from an AV Because a pointer is returned, you can use the reference to update as well as access the value stored If lval is non-zero, then it replaces the value at index with undef Stores an SV val at index within an AV and returns the pointer to the new element
SV** av_fetch(AV *, I32 index, I32 lval)
SV** av_store(AV*, I32 index, SV* val) Table 20-3
Functions for Handling AVs
20:
Extending and Embedding Perl
Function/Macro
void av_clear(AV*) void av_undef(AV*) void av_extend(AV*, int num) void av_push(AV*, SV*) SV* av_pop(AV*) SV* av_shift(AV*)
Description
Deletes the references to all the SVs in an AV, but does not delete the AV Deletes the AV Increases the size of the AV to num elements If num is less than the current number of elements, it does nothing Pushes an SV onto the end of the AV This is identical to the Perl push function Pops an SV off the end of an AV This is identical to the Perl pop function Returns the first SV from an AV, deleting the first element This is identical to the Perl shift function Adds num elements to the end of an AV, but does not actually store any values Use av_store to actually add the SVs onto the end of the AV This is not quite identical to the operation of the unshift function Gets the AV called varname, which should be a fully qualified name, without the leading @ sign Creates an AV with the specified name if create is 1
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