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use std::fmt::Display;
use arcstr::Substr;
use crate::syntax::location::Span;
#[derive(Debug, Clone)]
pub struct Token {
pub span: Span,
pub kind: TokenKind,
}
#[derive(Debug, Clone)]
pub enum TokenKind {
/// Keywords
Kw(Kw),
/// Identifiers
Ident(Substr),
/// System identifiers ('$foo')
SysIdent(Substr),
/// Symbols
Sym(Sym),
/// Numeric literals
Num(NumLit),
/// String literals
Str(Substr),
// Note: we don't really have a need to represent the actual values, yet.
/// Comments
Comment,
/// Error placeholder
Error,
}
impl TokenKind {
pub fn significant(&self) -> bool {
!matches!(self, TokenKind::Comment | TokenKind::Error)
}
pub fn ident(&self) -> Option<&Substr> {
match self {
TokenKind::Ident(substr) => Some(substr),
_ => None,
}
}
}
impl Display for TokenKind {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
TokenKind::Kw(kw) => write!(f, "keyword '{kw}'"),
TokenKind::Ident(ident) => write!(f, "identifier '{ident}'"),
TokenKind::SysIdent(ident) => write!(f, "system identifier '{ident}'"),
TokenKind::Sym(sym) => write!(f, "symbol '{sym}'"),
TokenKind::Num(NumLit::Int) => write!(f, "integer number"),
TokenKind::Num(NumLit::Mixed) => write!(f, "mixed number"),
TokenKind::Num(NumLit::Real) => write!(f, "real number"),
TokenKind::Num(NumLit::Repeated) => write!(f, "repeated bit number"),
TokenKind::Str(_) => write!(f, "string"),
TokenKind::Comment => write!(f, "comment"),
TokenKind::Error => write!(f, "error token"),
}
}
}
macro_rules! kw_list {
($(($name:ident, $string:literal, $doc:literal),)*) => {
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Kw {
$(#[doc=$doc] $name,)*
__Last
}
const KWS: &[(Kw, &'static str)]= &[
$((Kw::$name, $string),)*
];
impl Display for Kw {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
$(Kw::$name => f.write_str($string),)*
Kw::__Last => unreachable!()
}
}
}
};
}
impl Kw {
pub fn parse(s: &str) -> Option<Kw> {
// TODO: this could do with a trie or smth
KWS.iter().find(|k| k.1 == s).map(|k| k.0)
}
}
// https://github.com/B-Lang-org/bsc/blob/a798d8a94d54197d2b4755afdbb460cdc559c151/src/comp/SystemVerilogKeywords.lhs#L379
// BSV keywords moved to front.
#[rustfmt::skip]
kw_list![
(Action, "action", "`action`"),
(Endaction, "endaction", "`endaction`"),
(Actionvalue, "actionvalue", "`actionvalue`"),
(Endactionvalue, "endactionvalue", "`endactionvalue`"),
(Deriving, "deriving", "`deriving`"),
(Endinstance, "endinstance", "`endinstance`"),
(Let, "let", "`let`"),
(Method, "method", "`method`"),
(Endmethod, "endmethod", "`endmethod`"),
(Par, "par", "`par`"),
(Endpar, "endpar", "`endpar`"),
(Abortif, "abortif", "`abortif`"),
(Provisos, "provisos", "`provisos`"),
(Rule, "rule", "`rule`"),
(Endrule, "endrule", "`endrule`"),
(Rules, "rules", "`rules`"),
(Endrules, "endrules", "`endrules`"),
(Seq, "seq", "`seq`"),
(Endseq, "endseq", "`endseq`"),
(Goto, "goto", "`goto`"),
(Typeclass, "typeclass", "`typeclass`"),
(Endtypeclass, "endtypeclass", "`endtypeclass`"),
(Valueof, "valueof", "`valueof`"),
(ValueOf, "valueOf", "`valueOf`"),
(Stringof, "stringof", "`stringof`"),
(StringOf, "stringOf", "`stringOf`"),
(ClockedBy, "clocked_by", "`clocked_by`"),
(ResetBy, "reset_by", "`reset_by`"),
(PoweredBy, "powered_by", "`powered_by`"),
(ActionType, "Action", "`Action`"),
(ActionValueType, "ActionValue", "`ActionValue`"),
(Alias, "alias", "`alias`"),
(Always, "always", "`always`"),
(AlwaysComb, "always_comb", "`always_comb`"),
(AlwaysFf, "always_ff", "`always_ff`"),
(AlwaysLatch, "always_latch", "`always_latch`"),
(And, "and", "`and`"),
(Assert, "assert", "`assert`"),
(AssertStrobe, "assert_strobe", "`assert_strobe`"),
(Assign, "assign", "`assign`"),
(Assume, "assume", "`assume`"),
(Automatic, "automatic", "`automatic`"),
(Before, "before", "`before`"),
(Begin, "begin", "`begin`"),
(Bind, "bind", "`bind`"),
(Bins, "bins", "`bins`"),
(Binsof, "binsof", "`binsof`"),
(Bit, "bit", "`bit`"),
(Break, "break", "`break`"),
(Buf, "buf", "`buf`"),
(Bufif0, "bufif0", "`bufif0`"),
(Bufif1, "bufif1", "`bufif1`"),
(Byte, "byte", "`byte`"),
(Case, "case", "`case`"),
(Casex, "casex", "`casex`"),
(Casez, "casez", "`casez`"),
(Cell, "cell", "`cell`"),
(Chandle, "chandle", "`chandle`"),
(Class, "class", "`class`"),
(Clocking, "clocking", "`clocking`"),
(Cmos, "cmos", "`cmos`"),
(Config, "config", "`config`"),
(Const, "const", "`const`"),
(Constraint, "constraint", "`constraint`"),
(Context, "context", "`context`"),
(Continue, "continue", "`continue`"),
(Cover, "cover", "`cover`"),
(Covergroup, "covergroup", "`covergroup`"),
(Coverpoint, "coverpoint", "`coverpoint`"),
(Cross, "cross", "`cross`"),
(Deassign, "deassign", "`deassign`"),
(Default, "default", "`default`"),
(Defparam, "defparam", "`defparam`"),
(Design, "design", "`design`"),
(Disable, "disable", "`disable`"),
(Dist, "dist", "`dist`"),
(Do, "do", "`do`"),
(Edge, "edge", "`edge`"),
(Else, "else", "`else`"),
(End, "end", "`end`"),
(Endcase, "endcase", "`endcase`"),
(Endclass, "endclass", "`endclass`"),
(Endclocking, "endclocking", "`endclocking`"),
(Endconfig, "endconfig", "`endconfig`"),
(Endfunction, "endfunction", "`endfunction`"),
(Endgenerate, "endgenerate", "`endgenerate`"),
(Endgroup, "endgroup", "`endgroup`"),
(Endinterface, "endinterface", "`endinterface`"),
(Endmodule, "endmodule", "`endmodule`"),
(Endpackage, "endpackage", "`endpackage`"),
(Endprimitive, "endprimitive", "`endprimitive`"),
(Endprogram, "endprogram", "`endprogram`"),
(Endproperty, "endproperty", "`endproperty`"),
(Endspecify, "endspecify", "`endspecify`"),
(Endsequence, "endsequence", "`endsequence`"),
(Endtable, "endtable", "`endtable`"),
(Endtask, "endtask", "`endtask`"),
(Enum, "enum", "`enum`"),
(Event, "event", "`event`"),
(Expect, "expect", "`expect`"),
(Export, "export", "`export`"),
(Extends, "extends", "`extends`"),
(Extern, "extern", "`extern`"),
(Final, "final", "`final`"),
(FirstMatch, "first_match", "`first_match`"),
(For, "for", "`for`"),
(Force, "force", "`force`"),
(Foreach, "foreach", "`foreach`"),
(Forever, "forever", "`forever`"),
(Fork, "fork", "`fork`"),
(Forkjoin, "forkjoin", "`forkjoin`"),
(Function, "function", "`function`"),
(Generate, "generate", "`generate`"),
(Genvar, "genvar", "`genvar`"),
(Highz0, "highz0", "`highz0`"),
(Highz1, "highz1", "`highz1`"),
(If, "if", "`if`"),
(Iff, "iff", "`iff`"),
(Ifnone, "ifnone", "`ifnone`"),
(IgnoreBins, "ignore_bins", "`ignore_bins`"),
(IllegalBins, "illegal_bins", "`illegal_bins`"),
(Import, "import", "`import`"),
(Incdir, "incdir", "`incdir`"),
(Include, "include", "`include`"),
(Initial, "initial", "`initial`"),
(Inout, "inout", "`inout`"),
(Input, "input", "`input`"),
(Inside, "inside", "`inside`"),
(Instance, "instance", "`instance`"),
(Int, "int", "`int`"),
(Integer, "integer", "`integer`"),
(Interface, "interface", "`interface`"),
(Intersect, "intersect", "`intersect`"),
(Join, "join", "`join`"),
(JoinAny, "join_any", "`join_any`"),
(JoinNone, "join_none", "`join_none`"),
(Large, "large", "`large`"),
(Liblist, "liblist", "`liblist`"),
(Library, "library", "`library`"),
(Local, "local", "`local`"),
(Localparam, "localparam", "`localparam`"),
(Logic, "logic", "`logic`"),
(Longint, "longint", "`longint`"),
(Macromodule, "macromodule", "`macromodule`"),
(Match, "match", "`match`"),
(Matches, "matches", "`matches`"),
(Medium, "medium", "`medium`"),
(Modport, "modport", "`modport`"),
(Module, "module", "`module`"),
(Nand, "nand", "`nand`"),
(Negedge, "negedge", "`negedge`"),
(New, "new", "`new`"),
(Nmos, "nmos", "`nmos`"),
(Nor, "nor", "`nor`"),
(Noshowcancelled, "noshowcancelled", "`noshowcancelled`"),
(Not, "not", "`not`"),
(Notif0, "notif0", "`notif0`"),
(Notif1, "notif1", "`notif1`"),
(Null, "null", "`null`"),
(Or, "or", "`or`"),
(Output, "output", "`output`"),
(Package, "package", "`package`"),
(Packed, "packed", "`packed`"),
(Parameter, "parameter", "`parameter`"),
(Pmos, "pmos", "`pmos`"),
(Posedge, "posedge", "`posedge`"),
(Primitive, "primitive", "`primitive`"),
(Priority, "priority", "`priority`"),
(Program, "program", "`program`"),
(Property, "property", "`property`"),
(Protected, "protected", "`protected`"),
(Pull0, "pull0", "`pull0`"),
(Pull1, "pull1", "`pull1`"),
(Pulldown, "pulldown", "`pulldown`"),
(Pullup, "pullup", "`pullup`"),
(PulsestyleOnevent, "pulsestyle_onevent", "`pulsestyle_onevent`"),
(PulsestyleOndetect, "pulsestyle_ondetect", "`pulsestyle_ondetect`"),
(Pure, "pure", "`pure`"),
(Rand, "rand", "`rand`"),
(Randc, "randc", "`randc`"),
(Randcase, "randcase", "`randcase`"),
(Randsequence, "randsequence", "`randsequence`"),
(Rcmos, "rcmos", "`rcmos`"),
(Real, "real", "`real`"),
(Realtime, "realtime", "`realtime`"),
(Ref, "ref", "`ref`"),
(Reg, "reg", "`reg`"),
(Release, "release", "`release`"),
(Repeat, "repeat", "`repeat`"),
(Return, "return", "`return`"),
(Rnmos, "rnmos", "`rnmos`"),
(Rpmos, "rpmos", "`rpmos`"),
(Rtran, "rtran", "`rtran`"),
(Rtranif0, "rtranif0", "`rtranif0`"),
(Rtranif1, "rtranif1", "`rtranif1`"),
(Scalared, "scalared", "`scalared`"),
(Sequence, "sequence", "`sequence`"),
(Shortint, "shortint", "`shortint`"),
(Shortreal, "shortreal", "`shortreal`"),
(Showcancelled, "showcancelled", "`showcancelled`"),
(Signed, "signed", "`signed`"),
(Small, "small", "`small`"),
(Solve, "solve", "`solve`"),
(Specify, "specify", "`specify`"),
(Specparam, "specparam", "`specparam`"),
(Static, "static", "`static`"),
(String, "string", "`string`"),
(Strong0, "strong0", "`strong0`"),
(Strong1, "strong1", "`strong1`"),
(Struct, "struct", "`struct`"),
(Super, "super", "`super`"),
(Supply0, "supply0", "`supply0`"),
(Supply1, "supply1", "`supply1`"),
(Table, "table", "`table`"),
(Tagged, "tagged", "`tagged`"),
(Task, "task", "`task`"),
(This, "this", "`this`"),
(Throughout, "throughout", "`throughout`"),
(Time, "time", "`time`"),
(Timeprecision, "timeprecision", "`timeprecision`"),
(Timeunit, "timeunit", "`timeunit`"),
(Tran, "tran", "`tran`"),
(Tranif0, "tranif0", "`tranif0`"),
(Tranif1, "tranif1", "`tranif1`"),
(Tri, "tri", "`tri`"),
(Tri0, "tri0", "`tri0`"),
(Tri1, "tri1", "`tri1`"),
(Triand, "triand", "`triand`"),
(Trior, "trior", "`trior`"),
(Trireg, "trireg", "`trireg`"),
(Type, "type", "`type`"),
(Typedef, "typedef", "`typedef`"),
(Union, "union", "`union`"),
(Unique, "unique", "`unique`"),
(Unsigned, "unsigned", "`unsigned`"),
(Use, "use", "`use`"),
(Var, "var", "`var`"),
(Vectored, "vectored", "`vectored`"),
(Virtual, "virtual", "`virtual`"),
(Void, "void", "`void`"),
(Wait, "wait", "`wait`"),
(WaitOrder, "wait_order", "`wait_order`"),
(Wand, "wand", "`wand`"),
(Weak0, "weak0", "`weak0`"),
(Weak1, "weak1", "`weak1`"),
(While, "while", "`while`"),
(Wildcard, "wildcard", "`wildcard`"),
(Wire, "wire", "`wire`"),
(With, "with", "`with`"),
(Within, "within", "`within`"),
(Wor, "wor", "`wor`"),
(Xnor, "xnor", "`xnor`"),
(Xor, "xor", "`xor`"),
];
macro_rules! sym_list {
($(($name:ident, $string:literal, $doc:literal),)*) => {
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Sym {
$(#[doc=$doc] $name,)*
}
const SYMS: &[(Sym, &'static str)]= &[
$((Sym::$name, $string),)*
];
impl Display for Sym {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
$(Sym::$name => f.write_str($string),)*
}
}
}
};
}
impl Sym {
pub fn longest_match(str: &str) -> Option<(Sym, &'static str)> {
// SYMS are sorted by length descending, so first match is guaranteed to be the longest.
SYMS.iter().find(|(_, sym)| str.starts_with(sym)).copied()
}
}
// https://github.com/B-Lang-org/bsc/blob/a798d8a94d54197d2b4755afdbb460cdc559c151/src/comp/SystemVerilogKeywords.lhs#L642
// *MUST* be sorted by length descending
#[rustfmt::skip]
sym_list![
( LtLtLtEq, "<<<=", "`<<<=`" ),
( GtGtGtEq, ">>>=", "`>>>=`" ),
( BangEqEq, "!==", "`!==`" ),
( BangQuestionEq, "!?=", "`!?=`" ),
( EtEtEt, "&&&", "`&&&`" ),
( LtLtLt, "<<<", "`<<<`" ),
( LtLtEq, "<<=", "`<<=`" ),
( EqEqEq, "===", "`===`" ),
( EqQuestionEq, "=?=", "`=?=`" ),
( GtGtEq, ">>=", "`>>=`" ),
( GtGtGt, ">>>", "`>>>`" ),
( LbracketMinusGt, "[->", "`[->`" ),
( PipeMinusGt, "|->", "`|->`" ),
( PipeEqGt, "|=>", "`|=>`" ),
( BangEq, "!=", "`!=`" ),
( HashHash, "##", "`##`" ),
( PercentEq, "%=", "`%=`" ),
( EtEt, "&&", "`&&`" ),
( EtEq, "&=", "`&=`" ),
( LparenStar, "(*", "`(*`" ),
( StarRparen, "*)", "`*)`" ),
( StarStar, "**", "`**`" ),
( PlusPlus, "++", "`++`" ),
( PlusEq, "+=", "`+=`" ),
( MinusMinus, "--", "`--`" ),
( MinusEq, "-=", "`-=`" ),
( MinusGt, "->", "`->`" ),
( DotStar, ".*", "`.*`" ),
( DotDot, "..", "`..`" ),
( SlashEq, "/=", "`/=`" ),
( ColonColon, "::", "`::`" ),
( LtMinus, "<-", "`<-`" ),
( LtLt, "<<", "`<<`" ),
( LtEq, "<=", "`<=`" ),
( LtGt, "<>", "`<>`" ),
( EqEq, "==", "`==`" ),
( GtEq, ">=", "`>=`" ),
( GtGt, ">>", "`>>`" ),
( LbracketStar, "[*", "`[*`" ),
( LbracketEq, "[=", "`[=`" ),
( CaretEq, "^=", "`^=`" ),
( CaretTilde, "^~", "`^~`" ),
( PipeEq, "|=", "`|=`" ),
( PipePipe, "||", "`||`" ),
( TildeEt, "~&", "`~&`" ),
( TildeCaret, "~^", "`~^`" ),
( TildePipe, "~|", "`~|`" ),
( Bang, "!", "`!`" ),
( Hash, "#", "`#`" ),
( Dollar, "$", "`$`" ),
( Percent, "%", "`%`" ),
( Et, "&", "`&`" ),
( Tick, "'", "`'`" ),
( Lparen, "(", "`(`" ),
( Rparen, ")", "`)`" ),
( Star, "*", "`*`" ),
( Plus, "+", "`+`" ),
( Comma, ",", "`,`" ),
( Minus, "-", "`-`" ),
( Dot, ".", "`.`" ),
( Slash, "/", "`/`" ),
( Colon, ":", "`:`" ),
( Semi, ";", "`;`" ),
( Lt, "<", "`<`" ),
( Eq, "=", "`=`" ),
( Gt, ">", "`>`" ),
( Question, "?", "`?`" ),
( Lbracket, "[", "`[`" ),
( Rbracket, "]", "`]`" ),
( Caret, "^", "`^`" ),
( Backtick, "`", "```" ),
( Lbrace, "{", "`{`" ),
( Pipe, "|", "`|`" ),
( Rbrace, "}", "`}`" ),
( Tilde, "~", "`~`" ),
];
/// Numeric literal
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum NumLit {
/// Integer
Int,
/// Real (64-bit IEEE)
Real,
/// Repeated bit pattern
Repeated,
/// Mixed, includes 'X' and 'Z' bits
Mixed,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Bit {
Zero,
One,
Undef,
HighZ,
DontCare,
}
impl Bit {
pub fn parse(c: char) -> Option<Self> {
match c {
'0' => Some(Self::Zero),
'1' => Some(Self::One),
'x' | 'X' => Some(Self::Undef),
'z' | 'Z' => Some(Self::HighZ),
'?' => Some(Self::DontCare),
_ => None,
}
}
}