67 lines
3.1 KiB
TypeScript
67 lines
3.1 KiB
TypeScript
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import * as ohm from "ohm-js";
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export const boringGrammar = ohm.grammar(String.raw`
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Boringlang {
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ReturnStatement = "return" Expression ";"
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LetStatement = "let" Identifier (":" TypeUsage)? "=" Expression ";"
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AssignmentStatement = VariableUsage "=" Expression ";"
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| StructGetter "=" Expression ";"
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ExpressionStatement = Expression ";"
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Statement = ExpressionStatement
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| LetStatement
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| ReturnStatement
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| AssignmentStatement
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LiteralInt = digit+
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LiteralFloat = digit* "." digit+
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LiteralBool = "true" | "false"
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LiteralString = "\"" (~"\"" any)* "\""
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| "'" (~"'" any)* "'"
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LiteralStructField = Identifier ":" Expression
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LiteralStruct = Identifier "{" ListOf<LiteralStructField, ","> "}"
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Identifier = (letter | "_")+ (letter | digit | "_")*
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FunctionCall = Expression "(" ListOf<Expression, ","> ")"
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StructGetter = Expression "." Identifier
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VariableUsage = Identifier
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IfExpression = "if" "(" Expression ")" Block ("else" Block)?
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Term = LiteralInt
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| LiteralFloat
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| LiteralBool
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| LiteralString
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| LiteralStruct
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| IfExpression
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| Block
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| "(" Expression ")" -- parens
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| VariableUsage
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Factor = Factor "*" Term -- mult
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| Factor "/" Term -- div
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| Term
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Expression = Expression "+" Factor -- plus
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| Expression "-" Factor -- minus
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| StructGetter
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| FunctionCall
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| Factor
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Block = "{" Statement* Expression? "}"
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NamedTypeUsage = Identifier
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TypeUsage = NamedTypeUsage
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| "fn" "(" ListOf<TypeUsage, ","> ")" ":" TypeUsage -- function_tu
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FunctionArgument = Identifier ":" TypeUsage
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FunctionDeclaration = "fn" Identifier "(" ListOf<FunctionArgument, ","> ")" ":" TypeUsage
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Function = FunctionDeclaration Block
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StructTypeField = Identifier ":" TypeUsage
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StructTypeDeclaration = "type" Identifier "struct" "{" ListOf<StructTypeField, ","> "}"
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TraitMethod = FunctionDeclaration ";"
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TraitTypeDeclaration = "type" Identifier "trait" "{" TraitMethod* "}"
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TypeDeclaration = StructTypeDeclaration
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| TraitTypeDeclaration
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Impl = "impl" (NamedTypeUsage "for")? NamedTypeUsage "{" Function* "}"
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ModuleItem = Function
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| TypeDeclaration
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| Impl
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Module = ModuleItem*
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lineTerminator = "\n" | "\r" | "\u2028" | "\u2029"
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comment = "//" (~lineTerminator any)* lineTerminator
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space += comment
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}
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`);
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