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@ -1,99 +1,84 @@
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string
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------
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.. only:: html
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.. contents::
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String operations.
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Search and Replace
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^^^^^^^^^^^^^^^^^^
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FIND
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""""
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::
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string(FIND <string> <substring> <output variable> [REVERSE])
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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. If the substring is not found, a position of -1 is returned.
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REPLACE
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"""""""
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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(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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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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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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Regular Expressions
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^^^^^^^^^^^^^^^^^^^
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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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REGEX MATCH
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"""""""""""
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REPLACE will replace all occurrences of match_string in the input with
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replace_string and store the result in the output.
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::
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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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string(REGEX MATCH <regular_expression>
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<output variable> <input> [<input>...])
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MD5, SHA1, SHA224, SHA256, SHA384, and SHA512 will compute a
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cryptographic hash of the input string.
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Match the regular expression once and store the match in the output variable.
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All ``<input>`` arguments are concatenated before matching.
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COMPARE EQUAL/NOTEQUAL/LESS/GREATER will compare the strings and store
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true or false in the output variable.
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REGEX MATCHALL
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""""""""""""""
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ASCII will convert all numbers into corresponding ASCII characters.
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::
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CONFIGURE will transform a string like CONFIGURE_FILE transforms a
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file.
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string(REGEX MATCHALL <regular_expression>
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<output variable> <input> [<input>...])
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TOUPPER/TOLOWER will convert string to upper/lower characters.
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Match the regular expression as many times as possible and store the matches
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in the output variable as a list.
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All ``<input>`` arguments are concatenated before matching.
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LENGTH will return a given string's length.
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REGEX REPLACE
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"""""""""""""
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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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::
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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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string(REGEX REPLACE <regular_expression>
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<replace_expression> <output variable>
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<input> [<input>...])
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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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Match the regular expression as many times as possible and substitute the
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replacement expression for the match in the output.
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All ``<input>`` arguments are concatenated before matching.
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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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The replace expression may refer to paren-delimited subexpressions of the
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match using ``\1``, ``\2``, ..., ``\9``. Note that two backslashes (``\\1``)
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are required in CMake code to get a backslash through argument parsing.
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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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Regex Specification
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"""""""""""""""""""
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The following characters have special meaning in regular expressions:
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@ -118,21 +103,170 @@ The following characters have special meaning in regular expressions:
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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. | has lower
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precedence than concatenation. This means that the regular expression
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"^ab+d$" matches "abbd" but not "ababd", and the regular expression
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"^(ab|cd)$" matches "ab" but not "abd".
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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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Manipulation
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^^^^^^^^^^^^
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APPEND
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""""""
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::
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string(APPEND <string variable> [<input>...])
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Append all the input arguments to the string.
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CONCAT
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""""""
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::
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string(CONCAT <output variable> [<input>...])
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Concatenate all the input arguments together and store
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the result in the named output variable.
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TOLOWER
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"""""""
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::
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string(TOLOWER <string1> <output variable>)
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Convert string to lower characters.
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TOUPPER
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"""""""
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::
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string(TOUPPER <string1> <output variable>)
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Convert string to upper characters.
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TIMESTAMP will write a string representation of the current date
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LENGTH
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""""""
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::
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string(LENGTH <string> <output variable>)
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Store in an output variable a given string's length.
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SUBSTRING
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"""""""""
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::
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string(SUBSTRING <string> <begin> <length> <output variable>)
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Store in an output variable a substring of a given string. If length is
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``-1`` 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
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"""""
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::
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string(STRIP <string> <output variable>)
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Store in an output variable a substring of a given string with leading and
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trailing spaces removed.
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GENEX_STRIP
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"""""""""""
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::
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string(GENEX_STRIP <input string> <output variable>)
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Strip any :manual:`generator expressions <cmake-generator-expressions(7)>`
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from the ``input string`` and store the result in the ``output variable``.
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Comparison
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^^^^^^^^^^
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::
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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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Compare the strings and store true or false in the output variable.
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Hashing
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^^^^^^^
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::
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string(<MD5|SHA1|SHA224|SHA256|SHA384|SHA512>
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<output variable> <input>)
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Compute a cryptographic hash of the input string.
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Generation
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^^^^^^^^^^
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ASCII
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"""""
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::
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string(ASCII <number> [<number> ...] <output variable>)
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Convert all numbers into corresponding ASCII characters.
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CONFIGURE
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"""""""""
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::
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string(CONFIGURE <string1> <output variable>
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[@ONLY] [ESCAPE_QUOTES])
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Transform a string like :command:`configure_file` transforms a file.
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RANDOM
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""""""
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::
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string(RANDOM [LENGTH <length>] [ALPHABET <alphabet>]
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[RANDOM_SEED <seed>] <output variable>)
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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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TIMESTAMP
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"""""""""
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::
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string(TIMESTAMP <output variable> [<format string>] [UTC])
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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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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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The optional ``<format string>`` may contain the following format
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specifiers:
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::
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@ -153,23 +287,31 @@ specifiers:
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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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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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::
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string(MAKE_C_IDENTIFIER <input string> <output variable>)
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Write a string which can be used as an identifier in C.
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UUID
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""""
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::
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string(UUID <output variable> NAMESPACE <namespace> NAME <name>
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TYPE <MD5|SHA1> [UPPER])
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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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Create 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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Felix Geyer
9 years ago