Current File : //opt/alt/ruby32/include/ruby/internal/eval.h
#ifndef RBIMPL_EVAL_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_EVAL_H
/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright This file is a part of the programming language Ruby.
* Permission is hereby granted, to either redistribute and/or
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
* implementation details. Don't take them as canon. They could
* rapidly appear then vanish. The name (path) of this header file
* is also an implementation detail. Do not expect it to persist
* at the place it is now. Developers are free to move it anywhere
* anytime at will.
* @note To ruby-core: remember that this header can be possibly
* recursively included from extension libraries written in C++.
* Do not expect for instance `__VA_ARGS__` is always available.
* We assume C99 for ruby itself but we don't assume languages of
* extension libraries. They could be written in C++98.
* @brief Declares ::rb_eval_string().
*/
#include "ruby/internal/dllexport.h"
#include "ruby/internal/attr/nonnull.h"
#include "ruby/internal/value.h"
RBIMPL_SYMBOL_EXPORT_BEGIN()
RBIMPL_ATTR_NONNULL(())
/**
* Evaluates the given string.
*
* In case it is called from within a C-backended method, the evaluation is
* done under the current binding. However there can be no method. On such
* situation this function evaluates in an isolated binding, like `require`
* runs in a separate one.
*
* `__FILE__` will be `"(eval)"`, and `__LINE__` starts from 1 in the
* evaluation.
*
* @param[in] str Ruby code to evaluate.
* @exception rb_eException Raises an exception on error.
* @return The evaluated result.
*
* @internal
*
* @shyouhei's old tale about the birth and growth of this function:
*
* At the beginning, there was no rb_eval_string(). @shyouhei heard that
* @shugo, author of Apache httpd's mod_ruby module, requested @matz for this
* API. He wanted a way so that mod_ruby can evaluate ruby scripts one by one,
* separately, in each different contexts. So this function was made. It was
* designed to be a global interpreter entry point like ruby_run_node().
*
* The way it is implemented however allows extension libraries (not just
* programs like Apache httpd) to call this function. Because its name says
* nothing about the initial design, people started to think of it as an
* orthodox way to call ruby level `eval` method from their extension
* libraries. Even our `extension.rdoc` has had a description of this function
* basically according to this understanding.
*
* The old (mod_ruby like) usage still works. But over time, usages of this
* function from extension libraries got popular, while mod_ruby faded out; is
* no longer maintained now. Devs decided to actively support both. This
* function now auto-detects how it is called, and switches how it works
* depending on it.
*
* @see https://bugs.ruby-lang.org/issues/18780
*/
VALUE rb_eval_string(const char *str);
RBIMPL_ATTR_NONNULL((1))
/**
* Identical to rb_eval_string(), except it avoids potential global escapes.
* Such global escapes include exceptions, `throw`, `break`, for example.
*
* It first evaluates the given string as rb_eval_string() does. If no global
* escape occurred during the evaluation, it returns the result and `*state` is
* zero. Otherwise, it returns some undefined value and sets `*state` to
* nonzero. If state is `NULL`, it is not set in both cases.
*
* @param[in] str Ruby code to evaluate.
* @param[out] state State of execution.
* @return The evaluated result if succeeded, an undefined value if
* otherwise.
* @post `*state` is set to zero if succeeded. Nonzero otherwise.
* @warning You have to clear the error info with `rb_set_errinfo(Qnil)` if
* you decide to ignore the caught exception.
* @see rb_eval_string
* @see rb_protect
*
* @internal
*
* The "undefined value" described above is in fact ::RUBY_Qnil for now. But
* @shyouhei doesn't think that we would never change that.
*
* Though not a part of our public API, `state` is in fact an
* enum ruby_tag_type. You can see the potential "nonzero" values by looking
* at vm_core.h.
*/
VALUE rb_eval_string_protect(const char *str, int *state);
RBIMPL_ATTR_NONNULL((1))
/**
* Identical to rb_eval_string_protect(), except it evaluates the given string
* under a module binding in an isolated binding. This is the same as a
* binding for loaded libraries on `rb_load(something, true)`.
*
* @param[in] str Ruby code to evaluate.
* @param[out] state State of execution.
* @return The evaluated result if succeeded, an undefined value if
* otherwise.
* @post `*state` is set to zero if succeeded. Nonzero otherwise.
* @warning You have to clear the error info with `rb_set_errinfo(Qnil)` if
* you decide to ignore the caught exception.
* @see rb_eval_string
*/
VALUE rb_eval_string_wrap(const char *str, int *state);
/**
* Calls a method. Can call both public and private methods.
*
* @param[in,out] recv Receiver of the method.
* @param[in] mid Name of the method to call.
* @param[in] n Number of arguments that follow.
* @param[in] ... Arbitrary number of method arguments.
* @exception rb_eNoMethodError No such method.
* @exception rb_eException Any exceptions happen inside.
* @return What the method evaluates to.
*/
VALUE rb_funcall(VALUE recv, ID mid, int n, ...);
/**
* Identical to rb_funcall(), except it takes the method arguments as a C
* array.
*
* @param[in,out] recv Receiver of the method.
* @param[in] mid Name of the method to call.
* @param[in] argc Number of arguments.
* @param[in] argv Arbitrary number of method arguments.
* @exception rb_eNoMethodError No such method.
* @exception rb_eException Any exceptions happen inside.
* @return What the method evaluates to.
*/
VALUE rb_funcallv(VALUE recv, ID mid, int argc, const VALUE *argv);
/**
* Identical to rb_funcallv(), except you can specify how to handle the last
* element of the given array.
*
* @param[in,out] recv Receiver of the method.
* @param[in] mid Name of the method to call.
* @param[in] argc Number of arguments.
* @param[in] argv Arbitrary number of method arguments.
* @param[in] kw_splat Handling of keyword parameters:
* - RB_NO_KEYWORDS `argv`'s last is not a keyword argument.
* - RB_PASS_KEYWORDS `argv`'s last is a keyword argument.
* - RB_PASS_CALLED_KEYWORDS it depends if there is a passed block.
* @exception rb_eNoMethodError No such method.
* @exception rb_eException Any exceptions happen inside.
* @return What the method evaluates to.
*/
VALUE rb_funcallv_kw(VALUE recv, ID mid, int argc, const VALUE *argv, int kw_splat);
/**
* Identical to rb_funcallv(), except it only takes public methods into
* account. This is roughly Ruby's `Object#public_send`.
*
* @param[in,out] recv Receiver of the method.
* @param[in] mid Name of the method to call.
* @param[in] argc Number of arguments.
* @param[in] argv Arbitrary number of method arguments.
* @exception rb_eNoMethodError No such method.
* @exception rb_eNoMethodError The method is private or protected.
* @exception rb_eException Any exceptions happen inside.
* @return What the method evaluates to.
*/
VALUE rb_funcallv_public(VALUE recv, ID mid, int argc, const VALUE *argv);
/**
* Identical to rb_funcallv_public(), except you can specify how to handle the
* last element of the given array. It can also be seen as a routine identical
* to rb_funcallv_kw(), except it only takes public methods into account.
*
* @param[in,out] recv Receiver of the method.
* @param[in] mid Name of the method to call.
* @param[in] argc Number of arguments.
* @param[in] argv Arbitrary number of method arguments.
* @param[in] kw_splat Handling of keyword parameters:
* - RB_NO_KEYWORDS `argv`'s last is not a keyword argument.
* - RB_PASS_KEYWORDS `argv`'s last is a keyword argument.
* - RB_PASS_CALLED_KEYWORDS it depends if there is a passed block.
* @exception rb_eNoMethodError No such method.
* @exception rb_eNoMethodError The method is private or protected.
* @exception rb_eException Any exceptions happen inside.
* @return What the method evaluates to.
*/
VALUE rb_funcallv_public_kw(VALUE recv, ID mid, int argc, const VALUE *argv, int kw_splat);
/**
* @deprecated This is an old name of rb_funcallv(). Provided here for
* backwards compatibility to 2.x programs (introduced in 2.1).
* It is not a good name. Please don't use it any longer.
*/
#define rb_funcall2 rb_funcallv
/**
* @deprecated This is an old name of rb_funcallv_public(). Provided here
* for backwards compatibility to 2.x programs (introduced in
* 2.1). It is not a good name. Please don't use it any longer.
*/
#define rb_funcall3 rb_funcallv_public
/**
* Identical to rb_funcallv_public(), except you can pass the passed block.
*
* Sometimes you want to "pass" a block parameter form one method to another.
* Suppose you have this Ruby method `foo`:
*
* ```ruby
* def foo(x, y, &z)
* x.open(y, &z)
* end
* ```
*
* And suppose you want to translate this into C. Then
* rb_funcall_passing_block() function is usable in this situation.
*
* ```CXX
* VALUE
* foo_translated_into_C(VALUE self, VALUE x, VALUE y)
* {
* const auto open = rb_intern("open");
*
* return rb_funcall_passing_block(x, open, 1, &y);
* }
* ```
*
* @see rb_yield_block
* @param[in,out] recv Receiver of the method.
* @param[in] mid Name of the method to call.
* @param[in] argc Number of arguments.
* @param[in] argv Arbitrary number of method arguments.
* @exception rb_eNoMethodError No such method.
* @exception rb_eNoMethodError The method is private or protected.
* @exception rb_eException Any exceptions happen inside.
* @return What the method evaluates to.
*/
VALUE rb_funcall_passing_block(VALUE recv, ID mid, int argc, const VALUE *argv);
/**
* Identical to rb_funcallv_passing_block(), except you can specify how to
* handle the last element of the given array. It can also be seen as a
* routine identical to rb_funcallv_public_kw(), except you can pass the passed
* block.
*
* @param[in,out] recv Receiver of the method.
* @param[in] mid Name of the method to call.
* @param[in] argc Number of arguments.
* @param[in] argv Arbitrary number of method arguments.
* @param[in] kw_splat Handling of keyword parameters:
* - RB_NO_KEYWORDS `argv`'s last is not a keyword argument.
* - RB_PASS_KEYWORDS `argv`'s last is a keyword argument.
* - RB_PASS_CALLED_KEYWORDS it depends if there is a passed block.
* @exception rb_eNoMethodError No such method.
* @exception rb_eNoMethodError The method is private or protected.
* @exception rb_eException Any exceptions happen inside.
* @return What the method evaluates to.
*/
VALUE rb_funcall_passing_block_kw(VALUE recv, ID mid, int argc, const VALUE *argv, int kw_splat);
/**
* Identical to rb_funcallv_public(), except you can pass a block. A block
* here basically is an instance of ::rb_cProc. If you want to exercise
* `to_proc` conversion, do so before passing it here. However nil and symbols
* are special-case allowed.
*
* @param[in,out] recv Receiver of the method.
* @param[in] mid Name of the method to call.
* @param[in] argc Number of arguments.
* @param[in] argv Arbitrary number of method arguments.
* @param[in] procval An instance of Proc, Symbol, or NilClass.
* @exception rb_eNoMethodError No such method.
* @exception rb_eNoMethodError The method is private or protected.
* @exception rb_eException Any exceptions happen inside.
* @return What the method evaluates to.
*
* @internal
*
* Implementation-wise, `procval` is in fact a "block handler" object. You
* could also pass an IFUNC (block_handler_ifunc) here to say precise. --- But
* AFAIK there is no 3rd party way to even know that there are objects called
* IFUNC behind-the-scene.
*/
VALUE rb_funcall_with_block(VALUE recv, ID mid, int argc, const VALUE *argv, VALUE procval);
/**
* Identical to rb_funcallv_with_block(), except you can specify how to handle
* the last element of the given array. It can also be seen as a routine
* identical to rb_funcallv_public_kw(), except you can pass a block.
*
* @param[in,out] recv Receiver of the method.
* @param[in] mid Name of the method to call.
* @param[in] argc Number of arguments.
* @param[in] argv Arbitrary number of method arguments.
* @param[in] procval An instance of Proc, Symbol, or NilClass.
* @param[in] kw_splat Handling of keyword parameters:
* - RB_NO_KEYWORDS `argv`'s last is not a keyword argument.
* - RB_PASS_KEYWORDS `argv`'s last is a keyword argument.
* - RB_PASS_CALLED_KEYWORDS it depends if there is a passed block.
* @exception rb_eNoMethodError No such method.
* @exception rb_eNoMethodError The method is private or protected.
* @exception rb_eException Any exceptions happen inside.
* @return What the method evaluates to.
*/
VALUE rb_funcall_with_block_kw(VALUE recv, ID mid, int argc, const VALUE *argv, VALUE procval, int kw_splat);
/**
* This resembles ruby's `super`.
*
* @param[in] argc Number of arguments.
* @param[in] argv Arbitrary number of method arguments.
* @exception rb_eNoMethodError No super method are there.
* @exception rb_eException Any exceptions happen inside.
* @return What the super method evaluates to.
*/
VALUE rb_call_super(int argc, const VALUE *argv);
/**
* Identical to rb_call_super(), except you can specify how to handle the last
* element of the given array.
*
* @param[in] argc Number of arguments.
* @param[in] argv Arbitrary number of method arguments.
* @param[in] kw_splat Handling of keyword parameters:
* - RB_NO_KEYWORDS `argv`'s last is not a keyword argument.
* - RB_PASS_KEYWORDS `argv`'s last is a keyword argument.
* - RB_PASS_CALLED_KEYWORDS it depends if there is a passed block.
* @exception rb_eNoMethodError No super method are there.
* @exception rb_eException Any exceptions happen inside.
* @return What the super method evaluates to.
*/
VALUE rb_call_super_kw(int argc, const VALUE *argv, int kw_splat);
/**
* This resembles ruby's `self`.
*
* @exception rb_eRuntimeError Called from outside of method context.
* @return Current receiver.
*/
VALUE rb_current_receiver(void);
RBIMPL_ATTR_NONNULL((2))
/**
* Keyword argument deconstructor.
*
* Retrieves argument values bound to keywords, which directed by `table` into
* `values`, deleting retrieved entries from `keyword_hash` along the way.
* First `required` number of IDs referred by `table` are mandatory, and
* succeeding `optional` (`-optional-1` if `optional` is negative) number of
* IDs are optional. If a mandatory key is not contained in `keyword_hash`,
* raises ::rb_eArgError. If an optional key is not present in `keyword_hash`,
* the corresponding element in `values` is set to ::RUBY_Qundef. If
* `optional` is negative, rest of `keyword_hash` are ignored, otherwise raises
* ::rb_eArgError.
*
* @warning Handling keyword arguments in the C API is less efficient than
* handling them in Ruby. Consider using a Ruby wrapper method
* around a non-keyword C function.
* @see https://bugs.ruby-lang.org/issues/11339
* @param[out] keyword_hash Target hash to deconstruct.
* @param[in] table List of keywords that you are interested in.
* @param[in] required Number of mandatory keywords.
* @param[in] optional Number of optional keywords (can be negative).
* @param[out] values Buffer to be filled.
* @exception rb_eArgError Absence of a mandatory keyword.
* @exception rb_eArgError Found an unknown keyword.
* @return Number of found values that are stored into `values`.
*/
int rb_get_kwargs(VALUE keyword_hash, const ID *table, int required, int optional, VALUE *values);
RBIMPL_ATTR_NONNULL(())
/**
* Splits a hash into two.
*
* Takes a hash of various keys, and split it into symbol-keyed parts and
* others. Symbol-keyed part becomes the return value. What remains are
* returned as a new hash object stored at the argument pointer.
*
* @param[in,out] orighash Pointer to a target hash to split.
* @return An extracted keyword hash.
* @post Upon successful return `orighash` points to another hash
* object, whose contents are the remainder of the operation.
* @note The argument hash object is not modified.
*/
VALUE rb_extract_keywords(VALUE *orighash);
RBIMPL_SYMBOL_EXPORT_END()
#endif /* RBIMPL_EVAL_H */
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