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#ifndef RUBY_RE_H /*-*-C++-*-vi:se ft=cpp:*/
#define RUBY_RE_H 1
/**
* @file
* @author $Author$
* @date Thu Sep 30 14:18:32 JST 1993
* @copyright Copyright (C) 1993-2007 Yukihiro Matsumoto
* @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.
*/
#include "ruby/internal/config.h"
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <stdio.h>
#include "ruby/regex.h"
#include "ruby/internal/core/rmatch.h"
#include "ruby/internal/dllexport.h"
struct re_registers; /* Defined in onigmo.h */
RBIMPL_SYMBOL_EXPORT_BEGIN()
/**
* Creates a new instance of ::rb_cRegexp. It can be seen as a specialised
* version of rb_reg_new_str() where it does not take options.
*
* @param[in] str Source code in String.
* @return Allocated new instance of ::rb_cRegexp.
*/
VALUE rb_reg_regcomp(VALUE str);
/**
* Runs the passed regular expression over the passed string. Unlike
* rb_reg_search() this function also takes position and direction of the
* search, which make it possible for this function to run from in middle of
* the string.
*
* @param[in] re Regular expression to execute.
* @param[in] str Target string to search.
* @param[in] pos Offset in `str` to start searching, in bytes.
* @param[in] dir `pos`' direction; 0 means left-to-right, 1 for
* the opposite.
* @exception rb_eArgError `re` is broken.
* @exception rb_eRegexpError `re` is malformed.
* @retval -1 Match failed.
* @retval otherwise Offset of first such byte where match happened.
* @post `Regexp.last_match` is updated.
* @post `$&`, `$~`, etc., are updated.
*
* @internal
*
* Distinction between raising ::rb_eArgError and ::rb_eRegexpError is not
* obvious, at least to @shyouhei.
*/
long rb_reg_search(VALUE re, VALUE str, long pos, int dir);
/**
* Substitution. This is basically the implementation of `String#sub`. Also
* `String#gsub` repeatedly calls this function.
*
* @param[in] repl Replacement string, e.g. `"\\1\\2"`
* @param[in] src Source string, to be replaced.
* @param[in] regs Matched data generated by applying `rexp` to `src`.
* @param[in] rexp Regular expression.
* @return A substituted string.
*
* @internal
*
* This function does not check for encoding compatibility. `String#sub!`
* etc. employ their own checker.
*
* `regs` should have been `const struct re_registers *` because it is read
* only. Kept as-is for compatibility.
*/
VALUE rb_reg_regsub(VALUE repl, VALUE src, struct re_registers *regs, VALUE rexp);
/**
* Tell us if this is a wrong idea, but it seems this function has no usage at
* all. Just remains here for theoretical backwards compatibility.
*
* @param[in] re Regular expression to execute.
* @param[in] str Target string to search.
* @param[in] pos Offset in `str` to start searching, in bytes.
* @param[in] dir `pos`' direction; 0 means left-to-right, 1 for
* the opposite.
* @return Adjusted nearest offset to `pos` inside of `str`, where is a
* character boundary.
*
*/
long rb_reg_adjust_startpos(VALUE re, VALUE str, long pos, int dir);
/**
* Escapes any characters that would have special meaning in a regular
* expression.
*
* @param[in] str Target string to escape.
* @return A copy of `str` whose contents are escaped.
*/
VALUE rb_reg_quote(VALUE str);
/**
* Exercises various checks and preprocesses so that the given regular
* expression can be applied to the given string. The preprocess here includes
* (but not limited to) for instance encoding conversion.
*
* @param[in] re Target regular expression.
* @param[in] str What `re` is about to run on.
* @exception rb_eArgError `re` does not fit for `str`.
* @exception rb_eEncCompatError `re` and `str` are incompatible.
* @exception rb_eRegexpError `re` is malformed.
* @return A preprocessesed pattern buffer ready to be applied to `str`.
* @note The return value is manages by our GC. Don't free.
*
* @internal
*
* The return type, `regex_t *`, is defined in `<ruby/onigmo.h>`, _and_
* _conflicts_ with POSIX's `<regex.h>`. We can no longer save the situation
* at this point. Just don't mix the two.
*/
regex_t *rb_reg_prepare_re(VALUE re, VALUE str);
/**
* Duplicates a match data. This is roughly the same as `onig_region_copy()`,
* except it tries to GC when there is not enough memory.
*
* @param[out] dst Target registers to fill.
* @param[in] src Source registers to duplicate.
* @exception rb_eNoMemError Not enough memory.
* @retval 0 Successful
* @retval ONIGERR_MEMORY Not enough memory, even after GC (unlikely).
* @post `dst` has identical contents to `src`.
*
* @internal
*
* It seems this function is here for `ext/strscan` and nothing else.
*/
int rb_reg_region_copy(struct re_registers *dst, const struct re_registers *src);
RBIMPL_SYMBOL_EXPORT_END()
#endif /* RUBY_RE_H */
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