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###
# Function: parse_semver
#
# Description:
# Reads a file containing a semantic version string in the format
# MAJOR.MINOR.PATCH (e.g., 1.2.3), validates the format, and sets four
# variables in the calling scope with the given prefix:
#
# - <prefix>_VERSION_MAJOR
# - <prefix>_VERSION_MINOR
# - <prefix>_VERSION_PATCH
# - <prefix>_VERSION_STRING
#
# Inputs:
# - filename (string): Path to the file containing the version string.
# - prefix (string): Prefix to use for the output variable names.
#
# Outputs (set in PARENT_SCOPE):
# - <prefix>_VERSION_MAJOR
# - <prefix>_VERSION_MINOR
# - <prefix>_VERSION_PATCH
# - <prefix>_VERSION_STRING
#
# Errors:
# - FATAL_ERROR is raised if the file does not exist or the contents do
# not match the expected format.
###
function(parse_semver filename prefix)
if(NOT EXISTS "${filename}")
message(FATAL_ERROR "Version file '${filename}' does not exist.")
endif()
file(READ "${filename}" VERSION_CONTENT)
string(STRIP "${VERSION_CONTENT}" VERSION_CONTENT)
string(REGEX MATCH "^([0-9]+)\\.([0-9]+)\\.([0-9]+)$" _VERSION_MATCH
"${VERSION_CONTENT}")
if(NOT _VERSION_MATCH)
message(FATAL_ERROR "Invalid semantic version format in '${filename}': "
"'${VERSION_CONTENT}'")
endif()
set("${prefix}_VERSION_MAJOR" "${CMAKE_MATCH_1}" PARENT_SCOPE)
set("${prefix}_VERSION_MINOR" "${CMAKE_MATCH_2}" PARENT_SCOPE)
set("${prefix}_VERSION_PATCH" "${CMAKE_MATCH_3}" PARENT_SCOPE)
set("${prefix}_VERSION_STRING"
"${CMAKE_MATCH_1}.${CMAKE_MATCH_2}.${CMAKE_MATCH_3}" PARENT_SCOPE)
endfunction()
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