89 lines
3.3 KiB
C
89 lines
3.3 KiB
C
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#ifndef REDUCTOR_TEXT_H
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#define REDUCTOR_TEXT_H
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#include <stdbool.h>
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#include <stdint.h>
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typedef uint32_t rune_t;
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/// @brief Gets the length of the UTF-8 rune at a given offset.
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/// @param source Source to get the bytes from.
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/// @param len_source Length of 'source' in bytes.
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/// @param offset Offset to read from; doesn't have to be the start of the UTF-8 character.
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/// @return Length of the rune or zero on error.
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uint32_t tred_get_utf8_rune_length(
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const char *source,
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uint32_t len_source,
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uint32_t offset);
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/// @brief Extracts a UTF-8 character at some offset.
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/// @warning The length isn't provided by this function; it has to be gotten using
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/// 'tred_get_utf8_rune_length'.
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/// @param source Source string to get the bytes from.
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/// @param len_source Length of 'source' in bytes.
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/// @param offset Offset to read from; doesn't have to be the start of the UTF-8 character.
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/// @return Rune read from 'source' at 'offset'.
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rune_t tred_extract_utf8 (
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const char *source,
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uint32_t len_source,
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uint32_t offset);
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/// @brief Gets an ASCII character out of a source string, performing boundary checks.
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/// @param source Source to read from
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/// @param len_source Length of source to read from
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/// @param offset Offset to read at
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/// @return Rune read from 'source' at 'offset'.
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rune_t tred_extract_ascii (
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const char *source,
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uint32_t len_source,
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uint32_t offset);
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int32_t tred_get_utf8_length_from_head(uint8_t head);
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int32_t tred_get_utf8_head_offset(
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const char *source,
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uint32_t len_source,
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uint32_t offset);
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/// @brief Tests whether a rune is a blank (whitespace or tab) rune.
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/// @param rune Rune to test for being blank.
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/// @return 'true' if 'rune' is a blank character, 'false' otherwise.
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bool tred_rune_is_blank(rune_t rune);
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/// @brief Tests a rune_t for being a uppercase letter.
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/// @param rune Rune to test for being an uppercase Latin letter.
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/// @return 'true' if 'rune' is an uppercase Latin letter, 'false' otherwise.
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bool tred_rune_is_uppercase(rune_t rune);
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/// @brief Tests a rune_t for being a lowercase letter.
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/// @param rune Rune to test for being an lowercase Latin letter.
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/// @return 'true' if 'rune' is an lowercase Latin letter, 'false' otherwise.
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bool tred_rune_is_lowercase(rune_t rune);
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/// @brief Tests a rune_t for being either lowercase or uppercase.
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/// @param rune Rune to test for being a Latin letter.
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/// @return 'true' if 'rune' is either lowercase or uppercase, 'false' otherwise.
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bool tred_rune_is_alphabetic(rune_t rune);
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/// @brief Tests wheter a rune_t is a digit from 0 to 9.
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/// @param rune Rune to test for being a digit.
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/// @return 'true' if 'rune' is a digit from 0 to 9, 'false' otherwise.
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bool tred_rune_is_numeric(rune_t rune);
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/// @brief Tests whether a rune_t is either a digit from 0 to 9
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/// or a letter (either lowercase or uppercase).
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/// @param rune Rune to test for being alphanumeric
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/// @return 'true' if 'rune' is alphanumeric, 'false' otherwise.
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bool tred_rune_is_alphanumeric(rune_t rune);
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/// @brief Tests whether a rune_t is a sign of one of the four ASCII sign ranges.
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/// @param rune Rune to test for being a sign.
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/// @return 'true' if 'rune' is from either of the four ASCII sign ranges, 'false' otherwise.
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bool tred_rune_is_sign(rune_t rune);
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bool tred_rune_is_control(rune_t rune);
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#endif // REDUCTOR_TEXT_H
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