← Back
Editing: array.h
#ifndef RBIMPL_INTERN_ARRAY_H /*-*-C++-*-vi:se ft=cpp:*/ #define RBIMPL_INTERN_ARRAY_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 Public APIs related to ::rb_cArray. */ #include "ruby/internal/attr/noalias.h" #include "ruby/internal/attr/noexcept.h" #include "ruby/internal/attr/nonnull.h" #include "ruby/internal/attr/pure.h" #include "ruby/internal/dllexport.h" #include "ruby/internal/value.h" RBIMPL_SYMBOL_EXPORT_BEGIN() /* array.c */ RBIMPL_ATTR_NONNULL(()) RBIMPL_ATTR_NOALIAS() /** * Fills the memory region with a series of ::RUBY_Qnil. * * @param[out] buf Buffer to squash. * @param[in] len Number of objects of `buf`. * @post `buf` is filled with ::RUBY_Qnil. */ void rb_mem_clear(VALUE *buf, long len) RBIMPL_ATTR_NOEXCEPT(true) ; /** * Identical to rb_ary_new_from_values(), except it expects exactly two * parameters. * * @param[in] car Arbitrary ruby object. * @param[in] cdr Arbitrary ruby object. * @return An allocated new array, of length 2, whose contents are the * passed objects. */ VALUE rb_assoc_new(VALUE car, VALUE cdr); /** * Try converting an object to its array representation using its `to_ary` * method, if any. If there is no such thing, returns ::RUBY_Qnil. * * @param[in] obj Arbitrary ruby object to convert. * @exception rb_eTypeError `obj.to_ary` returned something non-Array. * @retval RUBY_Qnil No conversion from `obj` to array defined. * @retval otherwise Converted array representation of `obj`. * @see rb_io_check_io * @see rb_check_string_type * @see rb_check_hash_type */ VALUE rb_check_array_type(VALUE obj); /** * Allocates a new, empty array. * * @return An allocated new array, whose length is 0. */ VALUE rb_ary_new(void); /** * Identical to rb_ary_new(), except it additionally specifies how many rooms * of objects it should allocate. This way you can create an array whose * capacity is bigger than the length of it. If you can say that an array * grows to a specific amount, this could be effective than resizing an array * over and over again and again. * * @param[in] capa Designed capacity of the generating array. * @return An empty array, whose capacity is `capa`. */ VALUE rb_ary_new_capa(long capa); /** * Constructs an array from the passed objects. * * @param[in] n Number of passed objects. * @param[in] ... Arbitrary ruby objects, filled into the returning array. * @return An array of size `n`, whose contents are the passed objects. */ VALUE rb_ary_new_from_args(long n, ...); /** * Identical to rb_ary_new_from_args(), except how objects are passed. * * @param[in] n Number of objects of `elts`. * @param[in] elts Arbitrary ruby objects, filled into the returning array. * @return An array of size `n`, whose contents are the passed objects. */ VALUE rb_ary_new_from_values(long n, const VALUE *elts); /** * Allocates a hidden (no class) empty array. * * @param[in] capa Designed capacity of the array. * @return A hidden, empty array. * @see rb_obj_hide() */ VALUE rb_ary_hidden_new(long capa); #define rb_ary_tmp_new rb_ary_hidden_new /** * Destroys the given array for no reason. * * @warning DO NOT USE IT. * @warning Leave this task to our GC. * @warning It was a wrong indea at the first place to let you know about it. * * @param[out] ary The array to be executed. * @post The given array no longer exists. * @note Maybe `Array#clear` could be what you want. * * @internal * * Should have moved this to `internal/array.h`. */ void rb_ary_free(VALUE ary); /** * Declares that the array is about to be modified. This for instance let the * array have a dedicated backend storage. * * @param[out] ary Array about to be modified. * @exception rb_eFrozenError `ary` is frozen. * @post Upon successful return the passed array is eligible to be * modified. */ void rb_ary_modify(VALUE ary); /** @alias{rb_obj_freeze} */ VALUE rb_ary_freeze(VALUE obj); RBIMPL_ATTR_PURE() /** * Queries if the passed two arrays share the same backend storage. A use-case * for knowing such property is to take a snapshot of an array (using * e.g. rb_ary_replace()), then check later if that snapshot still shares the * storage with the original. Taking a snapshot is ultra-cheap. If nothing * happens the impact shall be minimal. But if someone modifies the original, * that entity shall pay the cost of copy-on-write. You can detect that using * this API. * * @param[in] lhs Comparison LHS. * @param[in] rhs Comparison RHS. * @retval RUBY_Qtrue They share the same backend storage. * @retval RUBY_Qfalse They are distinct. * @pre Both arguments must be of ::RUBY_T_ARRAY. */ VALUE rb_ary_shared_with_p(VALUE lhs, VALUE rhs); /** * Queries element(s) of an array. This is complicated! Refer `Array#slice` * document for the complete description of how it behaves. * * @param[in] argc Number of objects of `argv`. * @param[in] argv Up to 2 objects. * @param[in] ary Target array. * @exception rb_eTypeError `argv` (or its part) includes non-Integer. * @exception rb_eRangeError rb_cArithSeq is passed, and is OOB. * @return An element (if requested), or an array of elements (if * requested), or ::RUBY_Qnil (if index OOB). * * @internal * * ```rbs * # "int" is ::Integer or `#to_int`, defined in builtin.rbs * * class ::Array[unchecked out T] * def slice * : (int i) -> T? * | (int beg, int len) -> ::Array[T]? * | (Range[int] r) -> ::Array[T]? * | (ArithmeticSequence as) -> ::Array[T]? # This also raises RangeError. * end * ``` */ VALUE rb_ary_aref(int argc, const VALUE *argv, VALUE ary); /** * Obtains a part of the passed array. * * @param[in] ary Target array. * @param[in] beg Subpart index. * @param[in] len Requested length of returning array. * @retval RUBY_Qnil Requested range out of bounds of `ary`. * @retval otherwise An allocated new array whose contents are `ary`'s * `beg` to `len`. * @note Return array can be shorter than `len` when for instance * `[0, 1, 2, 3]`'s 4th to 1,000,000,000th is requested. */ VALUE rb_ary_subseq(VALUE ary, long beg, long len); /** * Destructively stores the passed value to the passed array's passed index. * It also resizes the array's backend storage so that the requested index is * not out of bounds. * * @param[out] ary Target array to modify. * @param[in] key Where to store `val`. * @param[in] val What to store at `key`. * @exception rb_eFrozenError `ary` is frozen. * @exception rb_eIndexError `key` is negative. * @post `ary`'s `key`th position is occupied with `val`. * @post Depending on `key` and previous length of `ary` this operation * can also create a series of "hole" positions inside of the * backend storage. They are filled with ::RUBY_Qnil. */ void rb_ary_store(VALUE ary, long key, VALUE val); /** * Duplicates an array. * * @param[in] ary Target to duplicate. * @return An allocated new array whose contents are identical to `ary`. * * @internal * * Not sure why this has to be something different from `ary_make_shared_copy`, * which seems much efficient. */ VALUE rb_ary_dup(VALUE ary); /** * I guess there is no use case of this function in extension libraries, but * this is a routine identical to rb_ary_dup(). This makes the most sense when * the passed array is formerly hidden by rb_obj_hide(). * * @param[in] ary An array, possibly hidden. * @return A duplicated new instance of ::rb_cArray. */ VALUE rb_ary_resurrect(VALUE ary); /** * Force converts an object to an array. It first tries its `#to_ary` method. * Takes the result if any. Otherwise creates an array of size 1 whose sole * element is the passed object. * * @param[in] obj Arbitrary ruby object. * @return An array representation of `obj`. * @note Unlike rb_str_to_str() which is a variant of * rb_check_string_type(), rb_ary_to_ary() is not a variant of * rb_check_array_type(). */ VALUE rb_ary_to_ary(VALUE obj); /** * Converts an array into a human-readable string. Historically its behaviour * changed over time. Currently it is identical to calling `inspect` method. * This behaviour is from that of python (!!) circa 2006. * * @param[in] ary Array to inspect. * @return Recursively inspected representation of `ary`. * @see `[ruby-dev:29520]` */ VALUE rb_ary_to_s(VALUE ary); /** * Destructively appends multiple elements at the end of the array. * * @param[out] ary Where to push `train`. * @param[in] train Arbitrary ruby objects to push to `ary`. * @param[in] len Number of objects of `train`. * @exception rb_eIndexError `len` too large. * @exception rb_eFrozenError `ary` is frozen. * @return The passed `ary`. * @post `ary` has contents from `train` appended at its end. */ VALUE rb_ary_cat(VALUE ary, const VALUE *train, long len); /** * Special case of rb_ary_cat() that it adds only one element. * * @param[out] ary Where to push `elem`. * @param[in] elem Arbitrary ruby object to push. * @exception rb_eFrozenError `ary` is frozen. * @return The passed `ary`. * @post `ary` has `elem` appended at its end. */ VALUE rb_ary_push(VALUE ary, VALUE elem); /** * Destructively deletes an element from the end of the passed array and * returns what was deleted. * * @param[out] ary Target array to modify. * @exception rb_eFrozenError `ary` is frozen. * @return What was at the end of `ary`, or ::RUBY_Qnil if there is * nothing to remove. * @post `ary`'s last element, if any, is removed. * @note There is no way to distinguish whether `ary` was an 1-element * array whose content was ::RUBY_Qnil, or was empty. */ VALUE rb_ary_pop(VALUE ary); /** * Destructively deletes an element from the beginning of the passed array and * returns what was deleted. It can also be seen as a routine identical to * rb_ary_pop(), except which side of the array to scrub. * * @param[out] ary Target array to modify. * @exception rb_eFrozenError `ary` is frozen. * @return What was at the beginning of `ary`, or ::RUBY_Qnil if there is * nothing to remove. * @post `ary`'s first element, if any, is removed. As the name implies * everything else remaining in `ary` gets moved towards `ary`'s * beginning. * @note There is no way to distinguish whether `ary` was an 1-element * array whose content was ::RUBY_Qnil, or was empty. */ VALUE rb_ary_shift(VALUE ary); /** * Destructively prepends the passed item at the beginning of the passed array. * It can also be seen as a routine identical to rb_ary_push(), except which * side of the array to modify. * * @param[out] ary Target array to modify. * @param[in] elem Arbitrary ruby object to unshift. * @exception rb_eFrozenError `ary` is frozen. * @return The passed `ary`. * @post `ary` has `elem` prepended at this beginning. */ VALUE rb_ary_unshift(VALUE ary, VALUE elem); RBIMPL_ATTR_PURE() /** * Queries an element of an array. When passed offset is negative it counts * backwards. * * @param[in] ary An array to look into. * @param[in] off Offset (can be negative). * @return ::RUBY_Qnil when `off` is out of bounds of `ary`. Otherwise * what is stored at `off`-th position of `ary`. * @note `ary`'s `off`-th element can happen to be ::RUBY_Qnil. */ VALUE rb_ary_entry(VALUE ary, long off); /** * Iteratively yields each element of the passed array to the implicitly passed * block if any. In case there is no block given, an enumerator that does the * thing is generated instead. * * @param[in] ary Array to iterate over. * @retval ary Passed block was evaluated. * @retval otherwise An instance of ::rb_cEnumerator for `Array#each`. */ VALUE rb_ary_each(VALUE ary); /** * Recursively stringises the elements of the passed array, flattens that * result, then joins the sequence using the passed separator. * * @param[in] ary Target array to convert. * @param[in] sep Separator. Either a string, or ::RUBY_Qnil * if you want no separator. * @exception rb_eArgError Infinite recursion in `ary`. * @exception rb_eTypeError `sep` is not a string. * @exception rb_eEncCompatError Strings do not agree with their encodings. * @return An instance of ::rb_cString which concatenates stringised * contents of `ary`, using `sep` as separator. */ VALUE rb_ary_join(VALUE ary, VALUE sep); /** * _Destructively_ reverses the passed array in-place. * * @warning This is `Array#reverse!`, not `Array#reverse`. * @param[out] ary Target array to modify. * @exception rb_eFrozenError `ary` is frozen. * @return Passed `ary`. * @post `ary` is reversed. */ VALUE rb_ary_reverse(VALUE ary); /** * _Destructively_ rotates the passed array in-place to towards its end. The * amount can be negative. Would rotate to the opposite direction then. * * @warning This is `Array#rotate!`, not `Array#rotate`. * @param[out] ary Target array to modify. * @param[in] rot Amount of rotation. * @exception rb_eFrozenError `ary` is frozen. * @retval RUBY_Qnil Not rotated. * @retval ary Rotated. * @post `ary` is rotated. */ VALUE rb_ary_rotate(VALUE ary, long rot); /** * Creates a copy of the passed array, whose elements are sorted according to * their `<=>` result. * * @param[in] ary Array to sort. * @exception rb_eArgError Comparison not defined among elements. * @exception rb_eRuntimeError Infinite recursion in `<=>`. * @return A copy of `ary`, sorted. * @note As of writing this function uses `qsort` as backend algorithm, * which means the result is unstable (in terms of sort stability). */ VALUE rb_ary_sort(VALUE ary); /** * Destructively sorts the passed array in-place, according to each elements' * `<=>` result. * * @param[in] ary Target array to modify. * @exception rb_eArgError Comparison not defined among elements. * @exception rb_eRuntimeError Infinite recursion in `<=>`. * @return Passed `ary`. * @post `ary` is sorted. * @note As of writing this function uses `qsort` as backend algorithm, * which means the result is unstable (in terms of sort stability). */ VALUE rb_ary_sort_bang(VALUE ary); /** * Destructively removes elements from the passed array, so that there would be * no elements inside that satisfy `==` relationship with the passed object. * Returns the last deleted element if any. But in case there was nothing to * delete it gets complicated. It checks for the implicitly passed block. If * there is a block the return value would be what the block evaluates to. * Otherwise it resorts to ::RUBY_Qnil. * * @param[out] ary Target array to modify. * @param[in] elem Template object to match against each element. * @exception rb_eFrozenError `ary` is frozen. * @return What was deleted, or what was the block returned, or * ::RUBY_Qnil (see above). * @post All elements that have `==` relationship with `elem` are purged * from `ary`. Elements shift their positions so that `ary` gets * compact. * * @internal * * Internally there also is `rb_ary_delete_same`, which compares by identity. */ VALUE rb_ary_delete(VALUE ary, VALUE elem); /** * Destructively removes an element which resides at the specific index of the * passed array. Unlike rb_ary_stre() the index can be negative, which means * the index counts backwards from the array's tail. * * @param[out] ary Target array to modify. * @param[in] pos Position (can be negative). * @exception rb_eFrozenError `ary` is frozen. * @return What was deleted, or ::RUBY_Qnil in case of OOB. * @post `ary`'s `pos`-th element is deleted if any. * @note There is no way to distinguish whether `pos` is out of bound, * or `pos` did exist but stored ::RUBY_Qnil as an ordinal value. */ VALUE rb_ary_delete_at(VALUE ary, long pos); /** * Destructively removes everything form an array. * * @param[out] ary Target array to modify. * @exception rb_eFrozenError `ary` is frozen. * @return The passed `ary`. * @post `ary` is an empty array. */ VALUE rb_ary_clear(VALUE ary); /** * Creates a new array, concatenating the former to the latter. * * @param[in] lhs Source array #1. * @param[in] rhs Source array #2. * @exception rb_eIndexError Result array too big. * @return A new array containing `rhs` concatenated to `lhs`. * @note This operation doesn't commute. Don't get confused by the * "plus" terminology. For historical reasons there are some * noncommutative `+`s in Ruby. This is one of such things. There * has been a long discussion around `+`s in programming languages. * * @internal * * rb_ary_concat() is not a destructive version of rb_ary_plus(). They raise * different exceptions. Don't know why though. */ VALUE rb_ary_plus(VALUE lhs, VALUE rhs); /** * Destructively appends the contents of latter into the end of former. * * @param[out] lhs Destination array. * @param[in] rhs Source array. * @exception rb_eFrozenError `lhs` is frozen. * @exception rb_eIndexError Result array too big. * @exception rb_eTypeError `rhs` doesn't respond to `#to_ary`. * @return The passed `lhs`. * @post `lhs` has contents of `rhs` appended to its end. */ VALUE rb_ary_concat(VALUE lhs, VALUE rhs); /** * Looks up the passed key, assuming the passed array is an alist. An "alist" * here is a list of "association"s, much like that of Emacs. Emacs has * `assoc` function that behaves exactly the same as this one. * * ```ruby * # This is an example of aliist. * auto_mode_alist = [ * [ /\.[ch]\z/, :"c-mode" ], * [ /\.[ch]pp\z/, :"c++-mode" ], * [ /\.awk\z/, :"awk-mode" ], * [ /\.cs\z/, :"csharp-mode" ], * [ /\.go\z/, :"go-mode" ], * [ /\.java\z/, :"java-mode" ], * [ /\.pas\z/, :"pascal-mode" ], * [ /\.rs\z/, :"rust-mode" ], * [ /\.txt\z/, :"text-mode" ], * ] * ``` * * This function scans the passed array looking for an element, which itself is * an array, whose first element is the passed key. If no such element is * found, returns ::RUBY_Qnil. * * Although this function expects the passed array be an array of arrays, it * can happily accept non-array elements; it just ignores such things. * * @param[in] alist An array of arrays. * @param[in] key Needle. * @retval RUBY_Qnil Nothing was found. * @retval otherwise An element in `alist` whose first element is in `==` * relationship with `key`. */ VALUE rb_ary_assoc(VALUE alist, VALUE key); /** * Identical to rb_ary_assoc(), except it scans the passed array from the * opposite direction. * * @param[in] alist An array of arrays. * @param[in] key Needle. * @retval RUBY_Qnil Nothing was found. * @retval otherwise An element in `alist` whose first element is in `==` * relationship with `key`. */ VALUE rb_ary_rassoc(VALUE alist, VALUE key); /** * Queries if the passed array has the passed entry. * * @param[in] ary Target array to scan. * @param[in] elem Target array to find. * @retval RUBY_Qfalse No element in `ary` is in `==` relationship with * `elem`. * @retval RUBY_Qtrue There is at least one element in `ary` which is in * `==` relationship with `elem`. * * @internal * * This is the only function in the entire C API that is named using third * person singular form of a verb (except #ISASCII etc., which are not our * naming). The counterpart Ruby API of this function is `Array#include?`. */ VALUE rb_ary_includes(VALUE ary, VALUE elem); /** * Recursively compares each elements of the two arrays one-by-one using `<=>`. * * @param[in] lhs Comparison LHS. * @param[in] rhs Comparison RHS. * @retval RUBY_Qnil `lhs` and `rhs` are not comparable. * @retval -1 `lhs` is less than `rhs`. * @retval 0 They are equal. * @retval 1 `rhs` is less then `lhs`. */ VALUE rb_ary_cmp(VALUE lhs, VALUE rhs); /** * Replaces the contents of the former object with the contents of the latter. * * @param[out] copy Destination object. * @param[in] orig Source object. * @exception rb_eTypeError `orig` has no implicit conversion to Array. * @exception rb_eFrozenError `copy` is frozen. * @return The passed `copy`. * @post `copy`'s former components are abandoned. It now has the * identical length and contents to `orig`. */ VALUE rb_ary_replace(VALUE copy, VALUE orig); /** * This _was_ a generalisation of `Array#values_at`, `Struct#values_at`, and * `MatchData#values_at`. It begun its life as a refactoring effort. However * as Ruby evolves over time, as of writing none of aforementioned methods * share their implementations at all. This function is not deprecated; still * works as it has been. But it is now kind of like a rudimentum. * * This function takes an object, which is a receiver, and a series of * "indices", which are either integers, or ranges of integers. Calls the * passed callback for each of those indices, along with the receiver. This * callback is expected to do something like rb_ary_aref(), rb_struct_aref(), * etc. In case of a range index rb_range_beg_len() expands the range. * Finally return values of the callback are gathered as an array, then * returned. * * @param[in] obj Arbitrary ruby object. * @param[in] olen "Length" of `obj`. * @param[in] argc Number of objects of `argv`. * @param[in] argv List of "indices", described above. * @param[in] func Callback function. * @return A new instance of ::rb_cArray gathering `func`outputs. * * @internal * * `Array#values_at` no longer uses this function. There is no reason apart * from historical ones to list this function here. */ VALUE rb_get_values_at(VALUE obj, long olen, int argc, const VALUE *argv, VALUE (*func)(VALUE obj, long oidx)); /** * Expands or shrinks the passed array to the passed length. * * @param[out] ary An array to modify. * @param[in] len Desired length of `ary`. * @exception rb_eFrozenError `ary` is frozen. * @exception rb_eIndexError `len` too long. * @return The passed `ary`. * @post `ary`'s length is `len`. * @post Depending on `len` and previous length of `ary` this operation * can also create a series of "hole" positions inside of the * backend storage. They are filled with ::RUBY_Qnil. * * @internal * * `len` is signed. Intentional or...? */ VALUE rb_ary_resize(VALUE ary, long len); #define rb_ary_new2 rb_ary_new_capa /**< @old{rb_ary_new_capa} */ #define rb_ary_new3 rb_ary_new_from_args /**< @old{rb_ary_new_from_args} */ #define rb_ary_new4 rb_ary_new_from_values /**< @old{rb_ary_new_from_values} */ RBIMPL_SYMBOL_EXPORT_END() #endif /* RBIMPL_INTERN_ARRAY_H */
Save File
Cancel