182 lines
7.3 KiB
ReStructuredText
182 lines
7.3 KiB
ReStructuredText
string
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------
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String operations.
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::
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string(REGEX MATCH <regular_expression>
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<output variable> <input> [<input>...])
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string(REGEX MATCHALL <regular_expression>
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<output variable> <input> [<input>...])
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string(REGEX REPLACE <regular_expression>
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<replace_expression> <output variable>
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<input> [<input>...])
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string(REPLACE <match_string>
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<replace_string> <output variable>
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<input> [<input>...])
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string(APPEND <string variable> [<input>...])
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string(CONCAT <output variable> [<input>...])
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string(<MD5|SHA1|SHA224|SHA256|SHA384|SHA512>
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<output variable> <input>)
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string(COMPARE EQUAL <string1> <string2> <output variable>)
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string(COMPARE NOTEQUAL <string1> <string2> <output variable>)
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string(COMPARE LESS <string1> <string2> <output variable>)
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string(COMPARE GREATER <string1> <string2> <output variable>)
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string(ASCII <number> [<number> ...] <output variable>)
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string(CONFIGURE <string1> <output variable>
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[@ONLY] [ESCAPE_QUOTES])
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string(TOUPPER <string1> <output variable>)
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string(TOLOWER <string1> <output variable>)
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string(LENGTH <string> <output variable>)
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string(SUBSTRING <string> <begin> <length> <output variable>)
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string(STRIP <string> <output variable>)
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string(RANDOM [LENGTH <length>] [ALPHABET <alphabet>]
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[RANDOM_SEED <seed>] <output variable>)
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string(FIND <string> <substring> <output variable> [REVERSE])
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string(TIMESTAMP <output variable> [<format string>] [UTC])
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string(MAKE_C_IDENTIFIER <input string> <output variable>)
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string(GENEX_STRIP <input string> <output variable>)
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string(UUID <output variable> NAMESPACE <namespace> NAME <name>
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TYPE <MD5|SHA1> [UPPER])
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``REGEX MATCH`` will match the regular expression once and store the match
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in the output variable.
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``REGEX MATCHALL`` will match the regular expression as many times as
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possible and store the matches in the output variable as a list.
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``REGEX REPLACE`` will match the regular expression as many times as
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possible and substitute the replacement expression for the match in
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the output. The replace expression may refer to paren-delimited
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subexpressions of the match using \1, \2, ..., \9. Note that two
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backslashes (\\1) are required in CMake code to get a backslash
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through argument parsing.
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``REPLACE`` will replace all occurrences of ``match_string`` in the input
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with ``replace_string`` and store the result in the output.
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``APPEND`` will append all the input arguments to the string.
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``CONCAT`` will concatenate all the input arguments together and store
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the result in the named output variable.
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``MD5``, ``SHA1``, ``SHA224``, ``SHA256``, ``SHA384``, and ``SHA512`` will
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compute a cryptographic hash of the input string.
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``COMPARE EQUAL``/``COMPARE NOTEQUAL``/``COMPARE LESS/GREATER`` will
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compare the strings and store true or false in the output variable.
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``ASCII`` will convert all numbers into corresponding ASCII characters.
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``CONFIGURE`` will transform a string like :command:`configure_file`
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transforms a file.
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``TOUPPER``/``TOLOWER`` will convert string to upper/lower characters.
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``LENGTH`` will return a given string's length.
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``SUBSTRING`` will return a substring of a given string. If length is -1
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the remainder of the string starting at begin will be returned.
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If string is shorter than length then end of string is used instead.
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.. note::
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CMake 3.1 and below reported an error if length pointed past
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the end of string.
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``STRIP`` will return a substring of a given string with leading and
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trailing spaces removed.
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``RANDOM`` will return a random string of given length consisting of
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characters from the given alphabet. Default length is 5 characters
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and default alphabet is all numbers and upper and lower case letters.
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If an integer ``RANDOM_SEED`` is given, its value will be used to seed the
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random number generator.
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``FIND`` will return the position where the given substring was found in
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the supplied string. If the ``REVERSE`` flag was used, the command will
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search for the position of the last occurrence of the specified
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substring.
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The following characters have special meaning in regular expressions:
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::
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^ Matches at beginning of input
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$ Matches at end of input
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. Matches any single character
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[ ] Matches any character(s) inside the brackets
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[^ ] Matches any character(s) not inside the brackets
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- Inside brackets, specifies an inclusive range between
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characters on either side e.g. [a-f] is [abcdef]
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To match a literal - using brackets, make it the first
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or the last character e.g. [+*/-] matches basic
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mathematical operators.
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* Matches preceding pattern zero or more times
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+ Matches preceding pattern one or more times
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? Matches preceding pattern zero or once only
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| Matches a pattern on either side of the |
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() Saves a matched subexpression, which can be referenced
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in the REGEX REPLACE operation. Additionally it is saved
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by all regular expression-related commands, including
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e.g. if( MATCHES ), in the variables CMAKE_MATCH_(0..9).
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``*``, ``+`` and ``?`` have higher precedence than concatenation. ``|``
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has lower precedence than concatenation. This means that the regular
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expression "^ab+d$" matches "abbd" but not "ababd", and the regular
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expression "^(ab|cd)$" matches "ab" but not "abd".
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``TIMESTAMP`` will write a string representation of the current date
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and/or time to the output variable.
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Should the command be unable to obtain a timestamp the output variable
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will be set to the empty string "".
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The optional ``UTC`` flag requests the current date/time representation to
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be in Coordinated Universal Time (UTC) rather than local time.
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The optional ``<format string>`` may contain the following format
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specifiers:
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::
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%d The day of the current month (01-31).
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%H The hour on a 24-hour clock (00-23).
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%I The hour on a 12-hour clock (01-12).
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%j The day of the current year (001-366).
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%m The month of the current year (01-12).
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%M The minute of the current hour (00-59).
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%S The second of the current minute.
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60 represents a leap second. (00-60)
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%U The week number of the current year (00-53).
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%w The day of the current week. 0 is Sunday. (0-6)
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%y The last two digits of the current year (00-99)
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%Y The current year.
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Unknown format specifiers will be ignored and copied to the output
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as-is.
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If no explicit ``<format string>`` is given it will default to:
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::
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%Y-%m-%dT%H:%M:%S for local time.
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%Y-%m-%dT%H:%M:%SZ for UTC.
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``MAKE_C_IDENTIFIER`` will write a string which can be used as an
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identifier in C.
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``GENEX_STRIP`` will strip any
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:manual:`generator expressions <cmake-generator-expressions(7)>` from the
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``input string`` and store the result in the ``output variable``.
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``UUID`` creates a univerally unique identifier (aka GUID) as per RFC4122
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based on the hash of the combined values of ``<namespace>``
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(which itself has to be a valid UUID) and ``<name>``.
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The hash algorithm can be either ``MD5`` (Version 3 UUID) or
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``SHA1`` (Version 5 UUID).
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A UUID has the format ``xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx``
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where each `x` represents a lower case hexadecimal character.
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Where required an uppercase representation can be requested
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with the optional ``UPPER`` flag.
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