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JSONParser.cmake
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JSONParser.cmake
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cmake_minimum_required(VERSION 3.1)
if (DEFINED JSonParserGuard)
return()
endif()
set(JSonParserGuard yes)
macro(sbeParseJson prefix jsonString)
cmake_policy(PUSH)
set(json_string "${${jsonString}}")
string(LENGTH "${json_string}" json_jsonLen)
set(json_index 0)
set(json_AllVariables ${prefix})
set(json_ArrayNestingLevel 0)
set(json_MaxArrayNestingLevel 0)
_sbeParse(${prefix})
unset(json_index)
unset(json_AllVariables)
unset(json_jsonLen)
unset(json_string)
unset(json_value)
unset(json_inValue)
unset(json_name)
unset(json_inName)
unset(json_newPrefix)
unset(json_reservedWord)
unset(json_arrayIndex)
unset(json_char)
unset(json_end)
unset(json_ArrayNestingLevel)
foreach(json_nestingLevel RANGE ${json_MaxArrayNestingLevel})
unset(json_${json_nestingLevel}_arrayIndex)
endforeach()
unset(json_nestingLevel)
unset(json_MaxArrayNestingLevel)
cmake_policy(POP)
endmacro()
macro(sbeClearJson prefix)
foreach(json_var ${${prefix}})
unset(${json_var})
endforeach()
unset(${prefix})
unset(json_var)
endmacro()
macro(sbePrintJson prefix)
foreach(json_var ${${prefix}})
message("${json_var} = ${${json_var}}")
endforeach()
endmacro()
macro(_sbeParse prefix)
while(${json_index} LESS ${json_jsonLen})
string(SUBSTRING "${json_string}" ${json_index} 1 json_char)
if("\"" STREQUAL "${json_char}")
_sbeParseNameValue(${prefix})
elseif("{" STREQUAL "${json_char}")
_sbeMoveToNextNonEmptyCharacter()
_sbeParseObject(${prefix})
elseif("[" STREQUAL "${json_char}")
_sbeMoveToNextNonEmptyCharacter()
_sbeParseArray(${prefix})
endif()
if(${json_index} LESS ${json_jsonLen})
string(SUBSTRING "${json_string}" ${json_index} 1 json_char)
else()
break()
endif()
if ("}" STREQUAL "${json_char}" OR "]" STREQUAL "${json_char}")
break()
endif()
_sbeMoveToNextNonEmptyCharacter()
endwhile()
endmacro()
macro(_sbeParseNameValue prefix)
set(json_name "")
set(json_inName no)
while(${json_index} LESS ${json_jsonLen})
string(SUBSTRING "${json_string}" ${json_index} 1 json_char)
# check if name ends
if("\"" STREQUAL "${json_char}" AND json_inName)
set(json_inName no)
_sbeMoveToNextNonEmptyCharacter()
if(NOT ${json_index} LESS ${json_jsonLen})
break()
endif()
string(SUBSTRING "${json_string}" ${json_index} 1 json_char)
set(json_newPrefix ${prefix}.${json_name})
set(json_name "")
if(":" STREQUAL "${json_char}")
_sbeMoveToNextNonEmptyCharacter()
if(NOT ${json_index} LESS ${json_jsonLen})
break()
endif()
string(SUBSTRING "${json_string}" ${json_index} 1 json_char)
if("\"" STREQUAL "${json_char}")
_sbeParseValue(${json_newPrefix})
break()
elseif("{" STREQUAL "${json_char}")
_sbeMoveToNextNonEmptyCharacter()
_sbeParseObject(${json_newPrefix})
break()
elseif("[" STREQUAL "${json_char}")
_sbeMoveToNextNonEmptyCharacter()
_sbeParseArray(${json_newPrefix})
break()
else()
# reserved word starts
_sbeParseReservedWord(${json_newPrefix})
break()
endif()
else()
# name without value
list(APPEND ${json_AllVariables} ${json_newPrefix})
set(${json_newPrefix} "")
break()
endif()
endif()
if(json_inName)
# remove escapes
if("\\" STREQUAL "${json_char}")
math(EXPR json_index "${json_index} + 1")
if(NOT ${json_index} LESS ${json_jsonLen})
break()
endif()
string(SUBSTRING "${json_string}" ${json_index} 1 json_char)
endif()
set(json_name "${json_name}${json_char}")
endif()
# check if name starts
if("\"" STREQUAL "${json_char}" AND NOT json_inName)
set(json_inName yes)
endif()
_sbeMoveToNextNonEmptyCharacter()
endwhile()
endmacro()
macro(_sbeParseReservedWord prefix)
set(json_reservedWord "")
set(json_end no)
while(${json_index} LESS ${json_jsonLen} AND NOT json_end)
string(SUBSTRING "${json_string}" ${json_index} 1 json_char)
if("," STREQUAL "${json_char}" OR "}" STREQUAL "${json_char}" OR "]" STREQUAL "${json_char}")
set(json_end yes)
else()
set(json_reservedWord "${json_reservedWord}${json_char}")
math(EXPR json_index "${json_index} + 1")
endif()
endwhile()
list(APPEND ${json_AllVariables} ${prefix})
string(STRIP "${json_reservedWord}" json_reservedWord)
set(${prefix} ${json_reservedWord})
endmacro()
macro(_sbeParseValue prefix)
cmake_policy(SET CMP0054 NEW) # turn off implicit expansions in if statement
set(json_value "")
set(json_inValue no)
while(${json_index} LESS ${json_jsonLen})
# fast path for copying strings
if (json_inValue)
# attempt to gobble up to 128 bytes of string
string(SUBSTRING "${json_string}" ${json_index} 128 try_gobble)
# consume a piece of string we can just straight copy before encountering \ or "
string(REGEX MATCH "^[^\"\\\\]+" simple_copy "${try_gobble}")
string(CONCAT json_value "${json_value}" "${simple_copy}")
string(LENGTH "${simple_copy}" copy_length)
math(EXPR json_index "${json_index} + ${copy_length}")
endif()
string(SUBSTRING "${json_string}" ${json_index} 1 json_char)
# check if json_value ends, it is ended by "
if("\"" STREQUAL "${json_char}" AND json_inValue)
set(json_inValue no)
set(${prefix} ${json_value})
list(APPEND ${json_AllVariables} ${prefix})
_sbeMoveToNextNonEmptyCharacter()
break()
endif()
if(json_inValue)
# if " is escaped consume
if("\\" STREQUAL "${json_char}")
math(EXPR json_index "${json_index} + 1")
if(NOT ${json_index} LESS ${json_jsonLen})
break()
endif()
string(SUBSTRING "${json_string}" ${json_index} 1 json_char)
if(NOT "\"" STREQUAL "${json_char}")
# if it is not " then copy also escape character
set(json_char "\\${json_char}")
endif()
endif()
_sbeAddEscapedCharacter("${json_char}")
endif()
# check if value starts
if("\"" STREQUAL "${json_char}" AND NOT json_inValue)
set(json_inValue yes)
endif()
math(EXPR json_index "${json_index} + 1")
endwhile()
endmacro()
macro(_sbeAddEscapedCharacter char)
string(CONCAT json_value "${json_value}" "${char}")
endmacro()
macro(_sbeParseObject prefix)
_sbeParse(${prefix})
_sbeMoveToNextNonEmptyCharacter()
endmacro()
macro(_sbeParseArray prefix)
math(EXPR json_ArrayNestingLevel "${json_ArrayNestingLevel} + 1")
set(json_${json_ArrayNestingLevel}_arrayIndex 0)
set(${prefix} "")
list(APPEND ${json_AllVariables} ${prefix})
while(${json_index} LESS ${json_jsonLen})
string(SUBSTRING "${json_string}" ${json_index} 1 json_char)
if("\"" STREQUAL "${json_char}")
# simple value
list(APPEND ${prefix} ${json_${json_ArrayNestingLevel}_arrayIndex})
_sbeParseValue(${prefix}_${json_${json_ArrayNestingLevel}_arrayIndex})
elseif("{" STREQUAL "${json_char}")
# object
_sbeMoveToNextNonEmptyCharacter()
list(APPEND ${prefix} ${json_${json_ArrayNestingLevel}_arrayIndex})
_sbeParseObject(${prefix}_${json_${json_ArrayNestingLevel}_arrayIndex})
else()
list(APPEND ${prefix} ${json_${json_ArrayNestingLevel}_arrayIndex})
_sbeParseReservedWord(${prefix}_${json_${json_ArrayNestingLevel}_arrayIndex})
endif()
if(NOT ${json_index} LESS ${json_jsonLen})
break()
endif()
string(SUBSTRING "${json_string}" ${json_index} 1 json_char)
if("]" STREQUAL "${json_char}")
_sbeMoveToNextNonEmptyCharacter()
break()
elseif("," STREQUAL "${json_char}")
math(EXPR json_${json_ArrayNestingLevel}_arrayIndex "${json_${json_ArrayNestingLevel}_arrayIndex} + 1")
endif()
_sbeMoveToNextNonEmptyCharacter()
endwhile()
if(${json_MaxArrayNestingLevel} LESS ${json_ArrayNestingLevel})
set(json_MaxArrayNestingLevel ${json_ArrayNestingLevel})
endif()
math(EXPR json_ArrayNestingLevel "${json_ArrayNestingLevel} - 1")
endmacro()
macro(_sbeMoveToNextNonEmptyCharacter)
math(EXPR json_index "${json_index} + 1")
if(${json_index} LESS ${json_jsonLen})
string(SUBSTRING "${json_string}" ${json_index} 1 json_char)
while(${json_char} MATCHES "[ \t\n\r]" AND ${json_index} LESS ${json_jsonLen})
math(EXPR json_index "${json_index} + 1")
string(SUBSTRING "${json_string}" ${json_index} 1 json_char)
endwhile()
endif()
endmacro()