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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", "unsafe",
    "tags", "captures", "captvars"];


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

semicolons = 1;
backtick_quoted_strings = 0;
single_quoted_strings = 0;
indentation_sensitive = 0;
wrap_blocks_in_braces = 1;
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 = generic;
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;
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 = 1;
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 = (.storable_state ? "isize" : "usize");
re2c:YYCOPYMTAG = sigil "{lhs} = " sigil "{rhs};";
re2c:YYCOPYSTAG = sigil "{lhs} = " sigil "{rhs};";
re2c:YYCTYPE = "YYCTYPE";
re2c:YYCTXMARKER = (.api.generic ? "YYCTXMARKER" : (.api.record ? yyrecord ".") "yyctxmarker");
re2c:YYCURSOR = (.api.generic ? "YYCURSOR" : (.api.record ? yyrecord ".") "yycursor");
re2c:YYDEBUG = "YYDEBUG";
re2c:YYFILL = "YYFILL";
re2c:YYGETACCEPT = sigil "{var}";
re2c:YYGETCOND = "YYGETCONDITION"; // historic default
re2c:YYGETSTATE = "YYGETSTATE";
re2c:YYINPUT = (.api.generic ? "YYINPUT" : (.api.record ? yyrecord ".") "yyinput");
re2c:YYLESSTHAN = "YYLESSTHAN";
re2c:YYLIMIT = (.api.generic ? "YYLIMIT" : (.api.record ? yyrecord ".") "yylimit");
re2c:YYMARKER = (.api.generic ? "YYMARKER" : (.api.record ? yyrecord ".") "yymarker");
re2c:YYMAXFILL = "YYMAXFILL";
re2c:YYMAXNMATCH = "YYMAXNMATCH";
re2c:YYMTAGN = "YYMTAGN";
re2c:YYMTAGP = "YYMTAGP";
re2c:YYPEEK = (.api.generic ? "YYPEEK" : "get_unchecked");
re2c:YYRESTORE = "YYRESTORE";
re2c:YYRESTORECTX = "YYRESTORECTX";
re2c:YYRESTORETAG = "YYRESTORETAG";
re2c:YYSETACCEPT = sigil "{var} = " sigil "{val};";
re2c:YYSETCOND = "YYSETCONDITION"; // historic default
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 ? "@@" : "usize::MAX");
re2c:cond:divider = "";
re2c:cond:goto = "";


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

code:var_local =
    // In Rust uninitialized variable is an error, but if the compiler is able to see
    // that all paths overwrite the initial value, it warns about unused assignments.
    (!.init ? topindent "#[allow(unused_assignments)]" nl)
    topindent "let mut " name " : " type " = " init ";" nl;
code:var_global = topindent "static mut " name " : " type " = " init ";" nl;

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

code:array_local =
    topindent "let " name ": [" type "; " size "] = [" 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 = "isize";
code:type_uint = "usize";
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 = <undefined>;

code:switch =
    topindent "match " 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 = "_";

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

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

code:goto = <undefined>;

code:fndecl = <undefined>;

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

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

code:tailcall = code:fncall;

code:recursive_functions = [fn: fndef nl];

code:fingerprint =
    "/* Generated by re2rust" (.version ? " " version) (.date ? " on " date) " */" nl;

// No line directives in Rust: https://github.com/rust-lang/rfcs/issues/1862.
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 ? "let ") yych " = " (.api.generic
        ? (.unsafe
            ? "unsafe {" YYPEEK "}"
            : YYPEEK)
        : (.unsafe
            ? "unsafe {*" YYINPUT "." YYPEEK "(" YYCURSOR ")}"
            : YYINPUT "[" YYCURSOR "]") (.cast ? " as " YYCTYPE)
    ) ";" 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 = <undefined>;
code:yypeek_yyskip = <undefined>;
code:yyskip_yybackup = <undefined>;
code:yybackup_yyskip = <undefined>;
code:yybackup_yypeek = <undefined>;
code:yyskip_yybackup_yypeek = <undefined>;
code:yybackup_yypeek_yyskip = <undefined>;

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 =
    (.nested ? topindent "if " tag " != " neg " {" nl indent)
        topindent (.api.generic
            ? YYSHIFTSTAG
            : tag " -= " offset ";"
        ) nl
    (.nested ? dedent topindent "}" 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 " as usize] & " mask ") != 0";