eryx/GenerateEmbeddedSources.cmake at master · Bottersnike/eryx · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
if(NOT DEFINED MANIFEST)
    message(FATAL_ERROR "GenerateEmbeddedSources.cmake requires MANIFEST")
endif()

if(NOT DEFINED OUTPUT)
    message(FATAL_ERROR "GenerateEmbeddedSources.cmake requires OUTPUT")
endif()

string(REGEX REPLACE "^\"(.*)\"$" "\\1" MANIFEST "${MANIFEST}")
string(REGEX REPLACE "^\"(.*)\"$" "\\1" OUTPUT "${OUTPUT}")

file(READ "${MANIFEST}" _manifest)
string(REPLACE "\r\n" "\n" _manifest "${_manifest}")
string(REPLACE "\r" "\n" _manifest "${_manifest}")
string(REPLACE "\n" ";" _entries "${_manifest}")

set(_content "// Auto-generated by CMake -- do not edit\n")
string(APPEND _content "#include \"runtime/embedded_modules.h\"\n\n")

# Read each script file and emit it as concatenated raw string chunks.
# MSVC has a 16,380-char limit per string literal (C2026), so split into
# smaller chunks joined by implicit string literal concatenation.
set(_CHUNK_LIMIT 14000)
set(_idx 0)
foreach(_entry ${_entries})
    if("${_entry}" STREQUAL "")
        continue()
    endif()

    string(FIND "${_entry}" "|" _sep)
    if(_sep LESS 0)
        message(FATAL_ERROR "Invalid embedded source manifest entry: ${_entry}")
    endif()

    math(EXPR _src_start "${_sep} + 1")
    string(SUBSTRING "${_entry}" 0 ${_sep} _path)
    string(SUBSTRING "${_entry}" ${_src_start} -1 _src_file)
    file(READ "${_src_file}" _file_contents)

    string(LENGTH "${_file_contents}" _total_len)
    if(_total_len LESS_EQUAL ${_CHUNK_LIMIT})
        string(APPEND _content "static const char s_src_${_idx}[] = R\"SRCDELIM(${_file_contents})SRCDELIM\";\n\n")
    else()
        string(APPEND _content "static const char s_src_${_idx}[] =\n")
        set(_offset 0)
        while(_offset LESS _total_len)
            math(EXPR _remaining "${_total_len} - ${_offset}")
            if(_remaining LESS_EQUAL ${_CHUNK_LIMIT})
                set(_chunk_len ${_remaining})
            else()
                set(_chunk_len ${_CHUNK_LIMIT})
            endif()
            string(SUBSTRING "${_file_contents}" ${_offset} ${_chunk_len} _chunk)
            string(APPEND _content "    R\"SRCDELIM(${_chunk})SRCDELIM\"\n")
            math(EXPR _offset "${_offset} + ${_chunk_len}")
        endwhile()
        string(APPEND _content ";\n\n")
    endif()

    math(EXPR _idx "${_idx} + 1")
endforeach()

string(APPEND _content "extern const EmbeddedScriptModule g_embedded_script_modules[] = {\n")
set(_idx 0)
foreach(_entry ${_entries})
    if("${_entry}" STREQUAL "")
        continue()
    endif()

    string(FIND "${_entry}" "|" _sep)
    string(SUBSTRING "${_entry}" 0 ${_sep} _path)
    string(APPEND _content "    { \"${_path}\", s_src_${_idx} },\n")
    math(EXPR _idx "${_idx} + 1")
endforeach()
string(APPEND _content "    { nullptr, nullptr },\n")
string(APPEND _content "};\n")

file(WRITE "${OUTPUT}" "${_content}")