mirror of
https://github.com/microsoft/vcpkg.git
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258 lines
8.4 KiB
CMake
258 lines
8.4 KiB
CMake
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#[===[.md:
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# vcpkg_list
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A replacement for CMake's `list()` function, which correctly handles elements
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with internal semicolons (in other words, escaped semicolons).
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Use `vcpkg_list()` instead of `list()` whenever possible.
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```cmake
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vcpkg_list(SET <out-var> [<element>...])
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vcpkg_list(<COMMAND> <list-var> [<other-arguments>...])
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```
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In addition to all of the commands from `list()`, `vcpkg_list` adds
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a `vcpkg_list(SET)` command.
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This command takes its arguments, escapes them, and then concatenates
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them into a list; this should be used instead of `set()` for setting any
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list variable.
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Otherwise, the `vcpkg_list()` function is the same as the built-in
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`list()` function, with the following restrictions:
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- `GET`, `REMOVE_ITEM`, and `REMOVE_AT` support only one index/value
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- `POP_BACK` and `POP_FRONT` do not support getting the value into
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another out variable. Use C++ style `GET` then `POP_(BACK|FRONT)`.
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- `FILTER` and `TRANSFORM` are unsupported.
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See the [CMake documentation for `list()`](https://cmake.org/cmake/help/latest/command/list.html)
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for more information.
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## Notes: Some Weirdnesses
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The most major weirdness is due to `""` pulling double-duty as "list of zero elements",
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and "list of one element, which is empty". `vcpkg_list` always uses the former understanding.
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This can cause weird behavior, for example:
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```cmake
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set(lst "")
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vcpkg_list(APPEND lst "" "")
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# lst = ";"
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```
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This is because you're appending two elements to the empty list.
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One very weird behavior that comes out of this would be:
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```cmake
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set(lst "")
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vcpkg_list(APPEND lst "")
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# lst = ""
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```
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since `""` is the empty list, we append the empty element and end up with a list
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of one element, which is empty. This does not happen for non-empty lists;
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for example:
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```cmake
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set(lst "a")
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vcpkg_list(APPEND lst "")
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# lst = "a;"
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```
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only the empty list has this odd behavior.
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## Examples
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### Creating a list
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```cmake
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vcpkg_list(SET foo_param)
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if(DEFINED arg_FOO)
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vcpkg_list(SET foo_param FOO "${arg_FOO}")
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endif()
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```
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### Appending to a list
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```cmake
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set(OPTIONS -DFOO=BAR)
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if(VCPKG_TARGET_IS_WINDOWS)
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vcpkg_list(APPEND OPTIONS "-DOS=WINDOWS;FOO")
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endif()
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```
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### Popping the end off a list
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```cmake
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if(NOT list STREQUAL "")
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vcpkg_list(GET list end -1)
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vcpkg_list(POP_BACK list)
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endif()
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```
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#]===]
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macro(z_vcpkg_list_escape_once_more lst)
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string(REPLACE [[\;]] [[\\;]] "${lst}" "${${lst}}")
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endmacro()
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function(vcpkg_list)
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# NOTE: as this function replaces an existing CMake command,
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# it does not use cmake_parse_arguments
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# vcpkg_list(<operation> <list_var> ...)
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# A0 A1
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if(ARGC LESS "2")
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message(FATAL_ERROR "vcpkg_list requires at least two arguments.")
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endif()
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if(ARGV1 MATCHES "^ARGV([0-9]*)$|^ARG[CN]$|^CMAKE_CURRENT_FUNCTION")
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message(FATAL_ERROR "vcpkg_list does not support the list_var being ${ARGV1}.
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Please use a different variable name.")
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endif()
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set(list "${${ARGV1}}")
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set(operation "${ARGV0}")
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set(list_var "${ARGV1}")
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if(operation STREQUAL "SET")
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z_vcpkg_function_arguments(args 2)
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set("${list_var}" "${args}" PARENT_SCOPE)
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return()
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endif()
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# Normal reading functions
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if(operation STREQUAL "LENGTH")
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# vcpkg_list(LENGTH <list-var> <out-var>)
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# A0 A1 A2
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if(NOT ARGC EQUAL "3")
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message(FATAL_ERROR "vcpkg_list sub-command ${operation} requires two arguments.")
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endif()
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list(LENGTH list out)
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set("${ARGV2}" "${out}" PARENT_SCOPE)
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return()
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endif()
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if(operation MATCHES "^(GET|JOIN|FIND)$")
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# vcpkg_list(<operation> <list-var> <arg> <out-var>)
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# A0 A1 A2 A3
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if(NOT ARGC EQUAL "4")
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message(FATAL_ERROR "vcpkg_list sub-command ${operation} requires three arguments.")
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endif()
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if(operation STREQUAL "GET")
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list(LENGTH list length)
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if(length EQUAL "0")
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message(FATAL_ERROR "vcpkg_list GET given empty list")
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elseif(ARGV2 GREATER_EQUAL length OR ARGV2 LESS "-${length}")
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message(FATAL_ERROR "vcpkg_list index: ${ARGV2} is not in range")
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endif()
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endif()
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list("${operation}" list "${ARGV2}" out)
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set("${ARGV3}" "${out}" PARENT_SCOPE)
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return()
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endif()
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if(operation STREQUAL "SUBLIST")
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# vcpkg_list(SUBLIST <list-var> <begin> <length> <out-var>)
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# A0 A1 A2 A3 A4
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if(NOT ARGC EQUAL "5")
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message(FATAL_ERROR "vcpkg_list sub-command SUBLIST requires four arguments.")
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endif()
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list(LENGTH list length)
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if(ARGV2 LESS "0" OR (ARGV2 GREATER_EQUAL length AND NOT ARGV2 EQUAL "0"))
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message(FATAL_ERROR "vcpkg_list begin index: ${ARGV2} is out of range")
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endif()
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z_vcpkg_list_escape_once_more(list)
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list(SUBLIST list "${ARGV2}" "${ARGV3}" out)
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set("${ARGV4}" "${out}" PARENT_SCOPE)
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return()
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endif()
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# modification functions
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if(operation MATCHES "^(APPEND|PREPEND)$")
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# vcpkg_list(<operation> <list> [<element>...])
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# A0 A1 A2...
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# if ARGC <= 2, then we don't have to do anything
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if(ARGC GREATER 2)
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z_vcpkg_function_arguments(args 2)
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if(list STREQUAL "")
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set("${list_var}" "${args}" PARENT_SCOPE)
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elseif(operation STREQUAL "APPEND")
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set("${list_var}" "${list};${args}" PARENT_SCOPE)
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else()
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set("${list_var}" "${args};${list}" PARENT_SCOPE)
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endif()
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endif()
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return()
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endif()
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if(operation STREQUAL "INSERT")
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# vcpkg_list(INSERT <list> <index> [<element>...])
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# A0 A1 A2 A3...
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list(LENGTH list length)
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if(ARGV2 LESS "-{$length}" OR ARGV2 GREATER length)
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message(FATAL_ERROR "vcpkg_list index: ${ARGV2} out of range")
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endif()
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if(ARGC GREATER 3)
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# list(LENGTH) is one of the few subcommands that's fine
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list(LENGTH list length)
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if(ARGV2 LESS "0")
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math(EXPR ARGV2 "${length} + ${ARGV2}")
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endif()
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if(ARGV2 LESS "0" OR ARGV2 GREATER length)
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message(FATAL_ERROR "list index: ${ARGV2} out of range (-${length}, ${length})")
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endif()
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z_vcpkg_function_arguments(args 3)
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if(list STREQUAL "")
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set("${list_var}" "${args}" PARENT_SCOPE)
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elseif(ARGV2 EQUAL "0")
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set("${list_var}" "${args};${list}" PARENT_SCOPE)
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elseif(ARGV2 EQUAL length)
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set("${list_var}" "${list};${args}" PARENT_SCOPE)
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else()
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vcpkg_list(SUBLIST list 0 "${ARGV2}" list_start)
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vcpkg_list(SUBLIST list "${ARGV2}" -1 list_end)
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set("${list_var}" "${list_start};${args};${list_end}" PARENT_SCOPE)
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endif()
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elseif(ARGC LESS 3)
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message(FATAL_ERROR "vcpkg_list sub-command INSERT requires at least two arguments.")
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endif()
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return()
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endif()
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if(operation MATCHES "^(POP_BACK|POP_FRONT|REVERSE|REMOVE_DUPLICATES)$")
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# vcpkg_list(<operation> <list>)
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# A0 A1
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if(NOT ARGC EQUAL 2)
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message(FATAL_ERROR "vcpkg_list sub-command ${operation} requires one argument.")
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endif()
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z_vcpkg_list_escape_once_more(list)
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list("${operation}" list)
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set("${list_var}" "${list}" PARENT_SCOPE)
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return()
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endif()
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if(operation MATCHES "^(REMOVE_AT|REMOVE_ITEM)$")
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# vcpkg_list(<operation> <list> <index-or-item>)
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# A0 A1 A2
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if(NOT ARGC EQUAL 3)
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message(FATAL_ERROR "vcpkg_list sub-command ${operation} requires two arguments.")
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endif()
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if(operation STREQUAL "REMOVE_AT")
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list(LENGTH list length)
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if(ARGV2 GREATER_EQUAL length OR ARGV2 LESS "-${length}")
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message(FATAL_ERROR "vcpkg_list index: ${ARGV2} out of range")
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endif()
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endif()
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z_vcpkg_list_escape_once_more(list)
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string(REPLACE [[;]] [[\;]] ARGV2 "${ARGV2}")
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list("${operation}" list "${ARGV2}")
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set("${list_var}" "${list}" PARENT_SCOPE)
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return()
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endif()
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message(FATAL_ERROR "vcpkg_list sub-command ${operation} is not yet implemented.")
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endfunction()
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