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95 lines
3.2 KiB
95 lines
3.2 KiB
3 years ago
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/**
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* Prefix Match
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*
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* Match input value to a list of options, allowing non-ambiguous abbreviation and partial matching.
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* This library was designed for command recognition in interactive consoles and command interfaces.
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*
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* Created on 2020/06/09 by Ondřej Hruška
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*/
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#ifndef _PREFIX_MATCH_H
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#define _PREFIX_MATCH_H
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#include <stdbool.h>
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#include <stddef.h>
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/** Use case-sensitive matching */
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#define PREFIXMATCH_CASE_SENSITIVE 1
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/** Forbid abbreviations */
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#define PREFIXMATCH_NOABBREV 2
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/** Allow matching fewer words, if unambiguous */
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#define PREFIXMATCH_MULTI_PARTIAL 4
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enum pm_test_result {
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PM_TEST_NO_MATCH = 0,
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PM_TEST_MATCH = 1,
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PM_TEST_MATCH_MULTI_PARTIAL = 2,
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};
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/**
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* Recognize (optionally abbreviated) input
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*
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* @param[in] value - tested value
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* @param[in] options - options to match against
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* @param[in] flags - matching options (bitmask) - accepts PREFIXMATCH_CASE_SENSITIVE and PREFIXMATCH_NOABBREV
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* @return index of the matched option, -1 on mismatch or ambiguous match
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*/
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int prefix_match(const char *value, const char **options, int flags);
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/**
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* Recognize input consisting of one or more (optionally abbreviated) words
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*
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* @param[in] value - tested value
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* @param[in] options - options to match against, multi-word options separated by the listed delimiters
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* @param[in] delims - string with a list of possible delimiters (like for strtok)
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* @param[in] flags - matching options (bitmask) - accepts all options
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* @return index of the matched option, -1 on mismatch or ambiguous match
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*/
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int prefix_multipart_match(const char *restrict value, const char **options, const char* restrict delims, int flags);
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// useful internal functions exported for possible re-use
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/**
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* Test if two word sentences match, with individual words optionally allowed to be abbreviated.
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*
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* @internal
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* @param[in] tested - tested (optionally abbreviated) sentence
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* @param[in] full - full sentence
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* @param[in] delims - list of possible delimiters, same may be used for both sentences
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* @param[in] flags - matching options (bitmask) - accepts all options
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* @return 1-match; 0-no match; 2-partial (some words) match, if the PREFIXMATCH_MULTI_PARTIAL flag is set
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*/
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enum pm_test_result prefix_multipart_test(const char *restrict tested, const char* restrict full, const char *restrict delims, int flags);
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/**
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* Count words in a "sentence", delimited by any of the given set of delimiters.
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*
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* @internal
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* @param[in] sentence - one or multi-word string
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* @param[in] delims - delimiters accepted
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* @return number of words
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*/
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size_t pm_count_words(const char * restrict sentence, const char * restrict delims);
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/**
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* Measure word length
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*
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* @internal
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* @param[in] word - start of a word that ends with either one of the delimiters, or a null byte.
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* @param[in] delims - delimiters accepted
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* @return word length
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*/
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size_t pm_word_len(const char * restrict word, const char * restrict delims);
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/**
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* Skip N words in a sentence.
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*
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* @param[in] sentence - one or multi-word string
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* @param[in] delims - delimiters accepted
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* @param[in] skip - how many words to skip
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* @return pointer to the first byte after the last skipped word
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*/
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const char *pm_skip_words(const char * restrict sentence, const char * restrict delims, size_t skip);
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#endif //_PREFIX_MATCH_H
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