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// supported feature lists -----------------------------------------------------

supported_apis = ["simple", "generic", "record"];
supported_api_styles = ["free-form"];
supported_code_models = ["loop-switch", "recursive-functions"];
supported_targets = ["code", "dot"];
supported_features = ["nested-ifs", "bitmaps", "case-ranges",
    "tags", "captures", "captvars"];


// language-specific options ---------------------------------------------------

semicolons = 1;
backtick_quoted_strings = 0;
single_quoted_strings = 0;
indentation_sensitive = 0;
wrap_blocks_in_braces = 0;
special_escapes = "\n\r\t\\'\"";


// immutable configurations (command-line only options) ------------------------

re2c:target = code;
re2c:code-model = loop-switch;
re2c:input-encoding = ascii;
re2c:date = 1;
re2c:version = 1;
re2c:conditions = 0;
re2c:storable-state = 0;
re2c:flex-syntax = 0;
re2c:verbose = 0;
re2c:line-dirs = 0;


// mutable configurations ------------------------------------------------------

re2c:api = simple;
re2c:api:style = free-form;
re2c:api:sigil = "@@";
re2c:YYGETCOND:naked = 0;
re2c:YYSETCOND:naked = 0;
re2c:YYSETCOND@cond = "@@";
re2c:YYGETSTATE:naked = 0;
re2c:YYSETSTATE:naked = 0;
re2c:YYSETSTATE@state = "@@";
re2c:YYFILL@len = "@@";
re2c:YYFILL:naked = 0;
re2c:YYFN = ["<undefined-function-name>;<undefined-function-type>"];
re2c:yyfn:sep = ";";
re2c:yycond = "yycond";
re2c:yyctable = "yyctable";
re2c:yyaccept = "yyaccept";
re2c:yytarget = "yytarget";
re2c:yystate = "yystate";
re2c:yynmatch = "yynmatch";
re2c:yypmatch = "yypmatch";
re2c:yyrecord = "yyrecord";
re2c:yych = "yych";
re2c:yych:conversion = 0;
re2c:yych:literals = hex; // zig does not recognize '\f' escape sequence => use hex
re2c:yych:emit = (.code_model.recursive_functions ? 0 : 1);
re2c:yybm = "yybm";
re2c:yybm:hex = 0;
re2c:yyfill = "";
re2c:yystable = ""; // deprecated
re2c:header = "";
re2c:eof = -1;
re2c:sentinel = -1;
re2c:yyfill:enable = 1;
re2c:yyfill:parameter = 1;
re2c:yyfill:check = 1;
re2c:tags = 0;
re2c:tags:prefix = "yyt";
re2c:captures = 0;
re2c:captvars = 0;
re2c:posix-captures = 0;
re2c:posix-captvars = 0;
re2c:invert-captures = 0;
re2c:cond:abort = 1;
re2c:cond:prefix = "yyc_";
re2c:cond:enumprefix = "yyc";
re2c:cond:divider@cond = "@@";
re2c:cond:goto@cond = "@@";
re2c:state:abort = 1;
re2c:state:nextlabel = 0;
re2c:bit-vectors = 0;
re2c:debug-output = 0;
re2c:computed-gotos = 0;
re2c:computed-gotos:threshold = 9;
re2c:nested-ifs = 0;
re2c:case-insensitive = 0;
re2c:case-inverted = 0;
re2c:case-ranges = 1;
re2c:unsafe = 0;
re2c:monadic = 0;
re2c:encoding:ebcdic = 0;
re2c:encoding:utf32 = 0;
re2c:encoding:ucs2 = 0;
re2c:encoding:utf16 = 0;
re2c:encoding:utf8 = 0;
re2c:encoding-policy = ignore;
re2c:empty-class = match-empty;
re2c:indent:string = "    ";
re2c:indent:top = 0;
re2c:label:prefix = "yy"; // used to generate function names
re2c:label:yyfill = "";
re2c:label:yyloop = "yyl";
re2c:label:yyNext = "";
re2c:label:start = 0;


// mutable code configuration --------------------------------------------------

re2c:YYBACKUP = "yybackup";
re2c:YYBACKUPCTX = "yybackupctx";
re2c:YYCONDTYPE = "u32";
re2c:YYCOPYMTAG = sigil "{lhs} = " sigil "{rhs};";
re2c:YYCOPYSTAG = sigil "{lhs} = " sigil "{rhs};";
re2c:YYCTXMARKER = (.api.record ? yyrecord ".") "yyctxmarker";
re2c:YYCTYPE = "u8";
re2c:YYCURSOR = (.api.record ? yyrecord ".") "yycursor";
re2c:YYDEBUG = "yydebug";
re2c:YYFILL = "yyfill";
re2c:YYGETACCEPT = sigil "{var}";
re2c:YYGETCOND = "yygetcond";
re2c:YYGETSTATE = "yygetstate";
re2c:YYINPUT = (.api.record ? yyrecord ".") "yyinput";
re2c:YYLESSTHAN = "yylessthan";
re2c:YYLIMIT = (.api.record ? yyrecord ".") "yylimit";
re2c:YYMARKER = (.api.record ? yyrecord ".") "yymarker";
re2c:YYMAXFILL = "yymaxfill";
re2c:YYMAXNMATCH = "yymaxnmatch";
re2c:YYMTAGN = "yymtagn";
re2c:YYMTAGP = "yymtagp";
re2c:YYPEEK = "yypeek";
re2c:YYRESTORE = "yyrestore";
re2c:YYRESTORECTX = "yyrestorectx";
re2c:YYRESTORETAG = "yyrestoretag";
re2c:YYSETACCEPT = sigil "{var} = " sigil "{val};";
re2c:YYSETCOND = "yysetcond";
re2c:YYSETSTATE = "yysetstate";
re2c:YYSHIFT = "yyshift";
re2c:YYSHIFTSTAG = "yyshiftstag";
re2c:YYSHIFTMTAG = "yyshiftmtag";
re2c:YYSKIP = "yyskip";
re2c:YYSTAGN = "yystagn";
re2c:YYSTAGP = "yystagp";
re2c:tags:expression = (.api.record ? yyrecord ".") sigil;
re2c:tags:negative = (.api.generic ? "@@" : "std.math.maxInt(usize)");
re2c:cond:divider = "/* *********************************** */";
re2c:cond:goto = "goto " sigil ";";


// code templates --------------------------------------------------------------

code:var_local = topindent "var " name ": " type " = " (.init ? init : "0") ";" nl;
code:var_global = code:var_local;

code:const_local = topindent "const " name " = " init ";" nl;
code:const_global = code:const_local;

code:array_local =
    topindent "const " name " = [" size "]" type "{" nl indent
        [row: topindent [elem{0:-2}: elem ", "] [elem{-1}: elem ","] nl]
    dedent topindent "};" nl;

code:array_global = <undefined>;

code:array_elem = array "[" index "]";

code:enum = [elem: topindent "const " elem ": " type " = " init ";" nl];

code:enum_elem = name;

code:assign = topindent lhs " = " rhs ";" nl;

code:type_int = "i32";
code:type_uint = "u32";
code:type_yybm = "u8";
code:type_yytarget = <undefined>;

code:cmp_eq = "==";
code:cmp_ne = "!=";
code:cmp_lt = "<";
code:cmp_gt = ">";
code:cmp_le = "<=";
code:cmp_ge = ">=";

code:if_then_else =
    [branch{0}: topindent "if (" cond ") {" nl
        indent [stmt: stmt] dedent]
    [branch{1:-1}: topindent "} else " (.cond ? "if (" cond ") ") "{" nl
        indent [stmt: stmt] dedent]
    topindent "}" nl;

code:if_then_else_oneline =
    [branch{0}:    topindent "if (" cond ") { " [stmt: stmt] " }" nl]
    [branch{1:-1}: topindent "else " (.cond ? "if (" cond ") ") " {" [stmt: stmt] " }" nl];

code:switch =
    topindent "switch (" expr ") {" nl
        indent [case: case] dedent
    topindent "}" nl;

code:switch_cases =
    [case{0:-2}: topindent case "," nl]
    [case{-1}:   topindent case " => {" nl
        indent [stmt: stmt] dedent
    topindent "}," nl];

code:switch_cases_oneline =
    [case{0:-2}: topindent case "," nl]
    [case{-1}:   topindent case " => { " [stmt: stmt] " }," nl];

code:switch_case_range = [val{0}: val] (.many ? "..." [val{-1}: val]);

code:switch_case_default = "else";

code:loop =
    topindent (.loop_label ? label ": ") "while (true) {" nl
        indent [stmt: stmt] dedent
    topindent "}" nl;

code:continue = topindent "continue" (.loop_label ? " :" label) ";" nl;

code:goto = topindent "goto " label ";" nl;

code:fndecl = <undefined>;

code:fndef =
    topindent "fn " name "("
        [arg{0:-2}: argname ": " argtype ", "]
        [arg{-1}:   argname ": " argtype]
    ") " type " {" nl
        indent [stmt: stmt] dedent
    "}" nl;

code:fncall =
    topindent (.retval ? retval " = " name) "(" [arg{0:-2}: arg ", "] [arg{-1}: arg] ");" nl;

code:tailcall =
    topindent (.retval ? "return " name) "(" [arg{0:-2}: arg ", "] [arg{-1}: arg] ");" nl;

code:recursive_functions = [fn: fndef nl];

code:fingerprint =
    "// Generated by re2zig" (.version ? " " version) (.date ? " on " date) nl;

code:line_info = <undefined>;

code:abort = topindent "@panic(\"internal lexer error\");" nl;

code:yydebug =
    topindent (.api.generic
        ? YYDEBUG
    : (.api.record
        ? YYDEBUG "(" yyrecord ");"
        : YYDEBUG "(" state ", " yych ");"
    )) nl;

code:yypeek =
    topindent (.code_model.recursive_functions ? "const ") yych " = " (.api.generic
        ? YYPEEK
        : (.cast ? "@intCast(") YYINPUT "[" YYCURSOR "]" (.cast ? ")")
    ) ";" nl;

code:yyskip =
    topindent (.api.generic
        ? YYSKIP
        : YYCURSOR " += 1;"
    ) nl;

code:yybackup =
    topindent (.api.generic
        ? YYBACKUP
        : YYMARKER " = " YYCURSOR ";"
    ) nl;

code:yybackupctx =
    topindent (.api.generic
        ? YYBACKUPCTX
        : YYCTXMARKER " = " YYCURSOR ";"
    ) nl;

code:yyskip_yypeek =
    topindent (.code_model.recursive_functions ? YYCTYPE " ") yych " = "
        (.cast ? "@intCast(") "*++" YYCURSOR (.cast ? ")") ";" nl;

code:yypeek_yyskip =
    topindent (.code_model.recursive_functions ? YYCTYPE " ") yych " = "
        (.cast ? "@intCast(") "*" YYCURSOR "++" (.cast ? ")") ";" nl;

code:yyskip_yybackup =
    topindent YYMARKER " = ++" YYCURSOR ";" nl;

code:yybackup_yyskip =
    topindent YYMARKER " = " YYCURSOR "++;" nl;

code:yybackup_yypeek =
    topindent (.code_model.recursive_functions ? YYCTYPE " ") yych " = "
        (.cast ? "@intCast(") "*(" YYMARKER " = " YYCURSOR ")" (.cast ? ")") ";" nl;

code:yyskip_yybackup_yypeek =
    topindent (.code_model.recursive_functions ? YYCTYPE " ") yych " = "
        (.cast ? "@intCast(") "*(" YYMARKER " = ++" YYCURSOR ")" (.cast ? ")") ";" nl;

code:yybackup_yypeek_yyskip =
    topindent (.code_model.recursive_functions ? YYCTYPE " ") yych " = "
        (.cast ? "@intCast(") "*(" YYMARKER " = " YYCURSOR "++" (.cast ? ")") ");" nl;

code:yyrestore =
    topindent (.api.generic
        ? YYRESTORE
        : YYCURSOR " = " YYMARKER ";"
    ) nl;

code:yyrestorectx =
    topindent (.api.generic
        ? YYRESTORECTX
        : YYCURSOR " = " YYCTXMARKER ";"
    ) nl;

code:yyrestoretag =
    topindent (.api.generic
        ? YYRESTORETAG
        : YYCURSOR " = " tag ";"
    ) nl;

code:yyshift =
    topindent (.api.generic
        ? YYSHIFT
        : YYCURSOR " -= " offset ";"
    ) nl;

code:yyshiftstag =
    topindent (.nested ? "if (" tag " != " neg ") ")
    (.api.generic
        ? YYSHIFTSTAG
        : tag " -= " offset ";"
    ) nl;

code:yyshiftmtag =
    topindent YYSHIFTMTAG nl;

code:yystagp =
    topindent (.api.generic
        ? YYSTAGP
        : tag " = " YYCURSOR ";"
    ) nl;

code:yymtagp =
    topindent YYMTAGP nl;

code:yystagn =
    topindent (.api.generic
        ? YYSTAGN
        : tag " = " neg ";"
    ) nl;

code:yymtagn =
    topindent YYMTAGN nl;

code:yycopystag =
    topindent (.api.generic
        ? YYCOPYSTAG
        : lhs " = " rhs ";"
    ) nl;

code:yycopymtag =
    topindent (.api.generic
        ? YYCOPYMTAG
        : lhs " = " rhs ";"
    ) nl;

code:yygetaccept =
    (.api.generic
        ? YYGETACCEPT
        : (.api.record & (.storable_state | .code_model.recursive_functions) ? yyrecord ".") var);

code:yysetaccept =
    topindent (.api.generic
        ? YYSETACCEPT
        : (.api.record & (.storable_state | .code_model.recursive_functions) ? yyrecord ".")
            var " = " val ";"
    ) nl;

code:yygetcond =
    (.api.generic
        ? YYGETCOND
        : (.api.record ? yyrecord ".") var);

code:yysetcond =
    topindent (.api.generic
        ? YYSETCOND
        : (.api.record ? yyrecord ".") var " = " val ";"
    ) nl;

code:yygetstate =
    (.api.generic
        ? YYGETSTATE
        : (.api.record ? yyrecord ".") var);

code:yysetstate =
    topindent (.api.generic
        ? YYSETSTATE
        : (.api.record ? yyrecord "." var) " = " val ";"
    ) nl;

code:yylessthan =
    (.api.generic
        ? YYLESSTHAN
        : (.many
            ? "(" YYLIMIT " - " YYCURSOR ") < " need
            : YYLIMIT " <= " YYCURSOR));

code:yybm_filter = yych " & ~0xFF";

code:yybm_match = "(" yybm "[" offset "+" yych "] & " mask ") != 0";