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56 lines
1.5 KiB
56 lines
1.5 KiB
// AST factories
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{
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const attr = (name, args) => ({ name, args })
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const stmt = (stmt_type, args) => ({ type: "stmt", stmt_type, args })
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const decl = (decl_type, name, attrs, args) => ({ type: "decl", decl_type, name, attrs: attrs || [], args })
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}
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Program = WS @(Decl / Stmt)* WS
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// Declarations
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Decl = VarDecl
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VarDecl = attrs:Attrs? type:Type name:Ident SEMI { return decl("var", name, attrs, { type }) }
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// Statements
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Stmt = @AssignStmt SEMI
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AssignStmt = name:Ident ASSIGN expr:Expr { return stmt("assign", { name, expr }) }
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// Expressions
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Expr = BaseExpr
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BaseExpr = Number
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// Attributes
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Attrs = LATTR @AttrList RATTR
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AttrList = h:Attr t:(COMMA @Attr)* { return [h].concat(t) }
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/ '' { return [] }
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Attr = name:Ident args:(LPAREN @AttrArgs RPAREN)? { return attr(name, args || []) }
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AttrArgs = h:AttrArg t:(COMMA @AttrArg)* { return [h].concat(t) }
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/ '' { return [] }
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AttrArg = Ident / Number
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// Types
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Type = PrimitiveType
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PrimitiveType = S8 / U8 / U16
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// Terminals
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Ident = h:[a-zA-Z_] t:[0-9a-zA-Z_]* WS { return h + t.join('') }
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Number = digits:[0-9]+ WS { return parseInt(digits.join(''), 10) }
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/ '0x' digits:[a-fA-F0-9]+ WS { return parseInt(digits.join(''), 16) }
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/ '0b' digits:[01]+ WS { return parseInt(digits.join(''), 2) }
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// Terminal keywords
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S8 = @'s8' WS
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U8 = @'u8' WS
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U16 = @'u16' WS
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// Terminal symbols
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SEMI = ';' WS
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ASSIGN = '<-' WS
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LPAREN = '(' WS
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RPAREN = ')' WS
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COMMA = ',' WS
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LATTR = '[[' WS
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RATTR = ']]' WS
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// Misc
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WS = [ \t\r\n]*
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