srchilite::RegexPreProcessor Class Reference

preprocess a regular expression, e.g., transform "()" into "(?:)" More...

#include <regexpreprocessor.h>

Static Public Member Functions

static const std::string replace_references (const std::string &original, const backreference_replacements &replace)

Replace into the original string occurrences of backreferences with the corresponding string in the replace parameter, i.e., n} backreference will be replaced with replace[n-1]. More...

static const std::string replace_references (const std::string &original, const regex_match_results &results)

Replace into the original string occurrences of backreferences with the corresponding subexpressions that matched in the results. More...

static const std::string preprocess (const std::string &s)

translates marked subexpressions (...) into non marked subexpressions (?: ) More...

static const std::string make_nonsensitive (const std::string &s)

translates the expression into a case nonsensitive expression, i.e., foo is translated into [Ff][Oo][Oo] More...

static unsigned int num_of_subexpressions (const std::string &s)

counts the number of marked subexpressions (...) More...

static subexpressions_info num_of_marked_subexpressions (const std::string &s, bool allow_outer_char=false, bool allow_outer_nonmarked=false)

check that the expressions is made up of marked subexpressions (...) and no nested subexpressions and no char outside subexpressions (unless allow_outer_char is true). More...

static const
subexpressions_strings * split_marked_subexpressions (const std::string &s)

Splits the marked subexpressions of a regular expression made up of only marked subexpressions and no nested subexpressions and char outside subexpressions (thus, before calling this, you must make sure that num_of_marked_subexpressions did not return an error. More...

static bool contains_backreferences (const std::string &s)

Checks whether the passed regular expression string contains a backreference (e.g., either 1円 or a conditional with a backreference (?(1)...) More...

static backreference_info num_of_backreferences (const std::string &s)

counts the number of backreferences (also in conditionals) More...

static backreference_info num_of_references (const std::string &s)

counts the number of references (i.e., reference to a matched subexpression of another regular expression) More...

static const std::string replace_backreferences (const std::string &original, const backreference_replacements &replace)

Replace into the original string occurrences of backreferences with the corresponding string in the replace parameter, i.e.,
backreference will be replaced with replace[n-1]. More...

static const std::string replace_backreferences (const std::string &original, const regex_match_results &results)

Replace into the original string occurrences of backreferences with the corresponding subexpressions that matched in the results. More...

Detailed Description

preprocess a regular expression, e.g., transform "()" into "(?:)"

Member Function Documentation

bool srchilite::RegexPreProcessor::contains_backreferences ( const std::string & s )

static

Checks whether the passed regular expression string contains a backreference (e.g., either 1円 or a conditional with a backreference (?(1)...)

Returns: true if the passed regular expression string contains a backreference

const string srchilite::RegexPreProcessor::make_nonsensitive ( const std::string & s )

static

translates the expression into a case nonsensitive expression, i.e., foo is translated into [Ff][Oo][Oo]

Returns: the translated string

backreference_info srchilite::RegexPreProcessor::num_of_backreferences ( const std::string & s )

static

counts the number of backreferences (also in conditionals)

Parameters: s

Returns: the number of backreferences and the highest backreference number

subexpressions_info srchilite::RegexPreProcessor::num_of_marked_subexpressions ( const std::string & s,

bool allow_outer_char = false,

bool allow_outer_nonmarked = false

)

static

check that the expressions is made up of marked subexpressions (...) and no nested subexpressions and no char outside subexpressions (unless allow_outer_char is true).

Non-marked groups are allowed only if allow_outer_nonmarked is true.

Parameters: s

allow_outer_char whether we allow characters outside marked subexps

allow_outer_nonmarked whether we allow outer nonmarked subexps

Returns: the struct containing the number of marked subexpressions and possible errors

backreference_info srchilite::RegexPreProcessor::num_of_references ( const std::string & s )

static

counts the number of references (i.e., reference to a matched subexpression of another regular expression)

Parameters: s

Returns: the number of backreferences and the highest backreference number

unsigned int srchilite::RegexPreProcessor::num_of_subexpressions ( const std::string & s )

static

counts the number of marked subexpressions (...)

Parameters: s

Returns: the number of marked subexpressions

const string srchilite::RegexPreProcessor::preprocess ( const std::string & s )

static

translates marked subexpressions (...) into non marked subexpressions (?: )

Returns: the translated string

const std::string srchilite::RegexPreProcessor::replace_backreferences ( const std::string & original,

const backreference_replacements & replace

)

static

Replace into the original string occurrences of backreferences with the corresponding string in the replace parameter, i.e.,
backreference will be replaced with replace[n-1].

Warning: For the moment this is never used but in testing

Parameters: original

replace

Returns: the result of the replacement

const std::string srchilite::RegexPreProcessor::replace_backreferences ( const std::string & original,

const regex_match_results & results

)

static

Replace into the original string occurrences of backreferences with the corresponding subexpressions that matched in the results.

Notice that we assume that the results come from a regular expression without nested subexpressions.

Warning: For the moment this is never used but in testing

Parameters: original

results

Returns: the result of the replacement

const string srchilite::RegexPreProcessor::replace_references ( const std::string & original,

const backreference_replacements & replace

)

static

Replace into the original string occurrences of backreferences with the corresponding string in the replace parameter, i.e., n} backreference will be replaced with replace[n-1].

Parameters: original

replace

Returns: the result of the replacement

const string srchilite::RegexPreProcessor::replace_references ( const std::string & original,

const regex_match_results & results

)

static

Replace into the original string occurrences of backreferences with the corresponding subexpressions that matched in the results.

Notice that we assume that the results come from a regular expression without nested subexpressions.

Parameters: original

results

Returns: the result of the replacement

const subexpressions_strings * srchilite::RegexPreProcessor::split_marked_subexpressions ( const std::string & s )

static

Splits the marked subexpressions of a regular expression made up of only marked subexpressions and no nested subexpressions and char outside subexpressions (thus, before calling this, you must make sure that num_of_marked_subexpressions did not return an error.

Returns: the subexpressions in a collection (this is allocated on the heap, so it is up to the caller to delete it)

The documentation for this class was generated from the following files:

/home/bettini/work/source-highlight/src-highlite/lib/srchilite/regexpreprocessor.h
/home/bettini/work/source-highlight/src-highlite/lib/srchilite/regexpreprocessor.cpp