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