# zig syntax highlighting for kakoune (https://ziglang.org)
#
# based off of https://github.com/ziglang/zig.vim/blob/master/syntax/zig.vim
# as well as https://ziglang.org/documentation/master/#Grammar

hook global BufCreate .*[.]zig %{
  set-option buffer filetype zig
}

hook -group zig-highlight global WinSetOption filetype=zig %{
    add-highlighter window/zig ref zig
    hook -once -always window WinSetOption filetype=.* %{ remove-highlighter window/zig }
}

add-highlighter shared/zig regions
add-highlighter shared/zig/code default-region group

add-highlighter shared/zig/doc_comment      region '///[^/]' '$'       fill documentation
add-highlighter shared/zig/comment          region '//' '$'            fill comment

# TODO: highlight escape sequences within strings
add-highlighter shared/zig/string_double    region '"' (?<!\\)(\\\\)*" fill string
add-highlighter shared/zig/string_single    region "'" (?<!\\)(\\\\)*' fill string
add-highlighter shared/zig/string_multiline region '\\\\' '$'          fill string

# attributes
add-highlighter shared/zig/code/ regex '\b(?:const|var|extern|packed|export|pub|noalias|inline|noinline|comptime|callconv|volatile|allowzero|align|linksection|threadlocal)\b' 0:attribute
# structures
add-highlighter shared/zig/code/ regex '\b(?:struct|enum|union|error)\b' 0:attribute

# statement
add-highlighter shared/zig/code/ regex '\b(?:break|return|continue|asm|defer|errdefer|unreachable|try|catch|async|noasync|await|suspend|resume)\b' 0:keyword
# conditional
add-highlighter shared/zig/code/ regex '\b(?:if|else|switch|and|or|orelse)\b' 0:keyword
# repeat
add-highlighter shared/zig/code/ regex '\b(?:while|for)\b' 0:keyword
# other keywords
add-highlighter shared/zig/code/ regex '\b(?:fn|usingnamespace|test)\b' 0:keyword

# types
add-highlighter shared/zig/code/ regex '\b(?:bool|f16|f32|f64|f128|void|noreturn|type|anyerror|anyframe)\b' 0:type
add-highlighter shared/zig/code/ regex '\b(?:i0|u0|isize||usize|comptime_int|comptime_float)\b' 0:type
add-highlighter shared/zig/code/ regex '\b(?:[iu][1-9]\d*)\b' 0:type
add-highlighter shared/zig/code/ regex '\b(?:c_short|c_ushort|c_int|c_uint|c_long|c_ulong|c_longlong|c_ulonglong|c_longdouble|c_void)\b' 0:type

# primitive values
add-highlighter shared/zig/code/ regex '\b(?:true|false|null|undefined)\b' 0:value

# integer literals
add-highlighter shared/zig/code/ regex '\b[0-9]+\b' 0:value
add-highlighter shared/zig/code/ regex '\b0x[0-9a-fA-F]+\b' 0:value
add-highlighter shared/zig/code/ regex '\b0o[0-7]+\b' 0:value
add-highlighter shared/zig/code/ regex '\b0b[01]+\b' 0:value

# float literals
add-highlighter shared/zig/code/ regex '\b[0-9]+\.[0-9]+(?:[eE][-+]?[0-9]+)?\b' 0:value
add-highlighter shared/zig/code/ regex '\b0x[0-9a-fA-F]+\.[0-9a-fA-F]+(?:[pP][-+]?[0-9a-fA-F]+)?\b' 0:value
add-highlighter shared/zig/code/ regex '\b[0-9]+\.?[eE][-+]?[0-9]+\b' 0:value
add-highlighter shared/zig/code/ regex '\b0x[0-9a-fA-F]+\.?[eE][-+]?[0-9a-fA-F]+\b' 0:value

# operators
add-highlighter shared/zig/code/ regex '(?:\+|-|\*|/|%|=|<|>|&|\||\^|~|\?|!)' 0:operator

# builtin functions
add-highlighter shared/zig/code/ regex "@(?:addWithOverflow|ArgType|atomicLoad|atomicStore|bitCast|breakpoint)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:alignCast|alignOf|cDefine|cImport|cInclude)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:cUndef|canImplicitCast|clz|cmpxchgWeak|cmpxchgStrong|compileError)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:compileLog|ctz|popCount|divExact|divFloor|divTrunc)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:embedFile|export|tagName|TagType|errorName|call)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:errorReturnTrace|fence|fieldParentPtr|field|unionInit)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:frameAddress|import|newStackCall|asyncCall|intToPtr|IntType)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:memberCount|memberName|memberType|as)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:memcpy|memset|mod|mulWithOverflow|splat)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:bitOffsetOf|byteOffsetOf|OpaqueType|panic|ptrCast)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:ptrToInt|rem|returnAddress|setCold|Type|shuffle)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:setRuntimeSafety|setEvalBranchQuota|setFloatMode)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:setGlobalLinkage|setGlobalSection|shlExact|This|hasDecl|hasField)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:shlWithOverflow|shrExact|sizeOf|bitSizeOf|sqrt|byteSwap|subWithOverflow|intCast|floatCast|intToFloat|floatToInt|boolToInt|errSetCast)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:truncate|typeId|typeInfo|typeName|TypeOf|atomicRmw|bytesToSlice|sliceToBytes)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:intToError|errorToInt|intToEnum|enumToInt|setAlignStack|frame|Frame|frameSize|bitReverse|Vector)\b" 0:function
add-highlighter shared/zig/code/ regex "@(?:sin|cos|exp|exp2|log|log2|log10|fabs|floor|ceil|trunc|round)\b" 0:function