Add more (infix) operators #1091
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marvinborner
reviewed
Oct 6, 2025
| case _ => | ||
| val lhs = variable() | ||
| peek.kind match { | ||
| case `+=` | `-=` | `*=` | `/=` => |
dvdvgt
requested changes
Oct 6, 2025
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| case `<|` | ||
| case `|>` |
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We decided to delete these.
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| case `||` => "infixOr" | ||
| case `&&` => "infixAnd" | ||
| case `===` => "infixEq" | ||
| case `!==` => "infixNeq" | ||
| case `<` => "infixLt" | ||
| case `>` => "infixGt" | ||
| case `<` => "infixLt" | ||
| case `>` => "infixGt" | ||
| case `<=` => "infixLte" | ||
| case `>=` => "infixGte" | ||
| case `+` => "infixAdd" | ||
| case `-` => "infixSub" | ||
| case `*` => "infixMul" | ||
| case `/` => "infixDiv" | ||
| case `+` => "infixAdd" | ||
| case `+=` => "infixAdd" | ||
| case `-` => "infixSub" | ||
| case `-=` => "infixSub" | ||
| case `*` => "infixMul" | ||
| case `*=` => "infixMul" | ||
| case `/` => "infixDiv" | ||
| case `/=` => "infixDiv" | ||
| case `++` => "infixConcat" | ||
| case `>>` => "infixShr" | ||
| case `<<` => "infixShl" | ||
| case `--` => "infixRemove" | ||
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| case TokenKind.`~` => "infixTilde" | ||
| case TokenKind.`~>` => "infixTildeRight" | ||
| case TokenKind.`<~` => "infixTildeLeft" | ||
| case TokenKind.`|` => "infixPipe" | ||
| case TokenKind.`&` => "infixAmp" | ||
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| case `<|` => "infixPipeLeft" | ||
| case `|>` => "infixPipeRight" | ||
| case `..` => "infixDotDot" | ||
| case `...` => "infixDotDotDot" | ||
| case `^^` => "infixHatHat" | ||
| case `^` => "infixHat" |
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Use syntactic not semantic names since they can be overloaded anyway.
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Claude suggested these names:
case `+` => "infixPlus"
case `+=` => "infixPlusEq"
case `-` => "infixMinus"
case `-=` => "infixMinusEq"
case `*` => "infixStar"
case `*=` => "infixStarEq"
case `/` => "infixSlash"
case `/=` => "infixSlashEq"
case `++` => "infixPlusPlus"
case `>>` => "infixGreaterGreater"
case `<<` => "infixLessLess"
case `--` => "infixMinusMinus"
case TokenKind.`~` => "infixTilde"
case TokenKind.`~>` => "infixTildeGreater"
case TokenKind.`<~` => "infixLessTilde"
case TokenKind.`|` => "infixBar"
case TokenKind.`&` => "infixAmp"
case `<|` => "infixLessBar"
case `|>` => "infixBarGreater"
case `..` => "infixDotDot"
case `...` => "infixDotDotDot"
case `^^` => "infixCaretCaret"
case `^` => "infixCaret"
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Of course, please also change the other operator names
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| // <EXPR>.[<EXPR>, ...] | ||
| case `[` => | ||
| val bracket = peek | ||
| val arguments = some(expr, `[`, `,`, `]`) | ||
| e = MethodCall(e, | ||
| IdRef(Nil, "postfixAccess", Span(source, dot.start, bracket.end, Synthesized)), | ||
| Nil, arguments.unspan.map(a => ValueArg.Unnamed(a)), Nil, | ||
| Span(source, e.span.from, arguments.span.to, Synthesized) | ||
| ) | ||
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| case _ => | ||
| val member = idRef() | ||
| // method call | ||
| if (isArguments) { | ||
| val (targs, vargs, bargs) = arguments() | ||
| e = Term.MethodCall(e, member, targs, vargs, bargs, span()) | ||
| } else { | ||
| e = Term.MethodCall(e, member, Nil, Nil, Nil, span()) | ||
| } |
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Extract into separate PR. Needs further discussion, e.g. setting an array. Do we also want a dedicated syntax for that?
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This PR adds a few more infix operators. This is mostly just lexing and parsing so doesn't come with a lot of conceptual cost for the implementation.
A few things are not clear / implemented:
infixAddtoInfixPlus, but this will break a lot of things)a === banda !== bsince the tokens===are already used to represent==, ahhh.