Made progress on the AST
channa
7 months ago
parent
32d290b743
commit
705249bfae
@ -0,0 +1,87 @@
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module AST
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data AProgram(loc src = |tmp:///|)
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= program(AId id, list[AConst] consts, list[AVar] vars, list[ASubProg] subProgs, ABlock main)
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;
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data AConst(loc src = |tmp:///|)
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= const(AId id, AType \type, AValue \value)
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;
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data AVar(loc src = |tmp:///|)
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= var(AId id, AType \type)
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;
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data ASubProg(loc src = |tmp:///|)
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= function(AId id, list[AParam] parameters, AType \returnType, list[AVar] locals, ABlock body)
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| procedure(AId id, list[AParam] parameters, list[AVar] locals, ABlock body)
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;
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data AParam(loc src = |tmp:///|)
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= referenceParam(AId id, AType \type)
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| valueParam(AId id, AType \type)
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;
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data AType(loc src = |tmp:///|)
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= simpleType(ABasicType \basic)
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| arrayType(ABasicType \basic)
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;
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data ABasicType(loc src = |tmp:///|)
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= integerType()
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| realType()
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;
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data ABlock(loc src = |tmp:///|)
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= block(list[AStatement] body)
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;
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data AStatement(loc src = |tmp:///|)
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= assignment(ALhs lhs, AExpr res)
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| call(ASubProgCall subProg)
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| skip()
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| blockStatement(ABlock block)
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| \if(AGuard guard, AStatement ifBody, AStatement elseBody)
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| \while(AGuard guard, AStatement body)
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;
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data ASubProgCall(loc src = |tmp:///|)
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= call(AId id, list[AExpr] args)
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| readln(list[AId] ids)
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| writeln(list[AExpr] args)
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;
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data AGuard(loc src = |tmp:///|)
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= lessThan(AExpr left, AExpr right)
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| lessThanEqual(AExpr left, AExpr right)
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| greaterThan(AExpr left, AExpr right)
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| greaterThanEqual(AExpr left, AExpr right)
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| equal(AExpr left, AExpr right)
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| not(AGuard inner)
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| and(AGuard left, AGuard right)
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| or(AGuard left, AGuard right)
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;
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data ALhs(loc src = |tmp:///|)
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= simple(AId id)
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| indexed(AId id, AExpr index)
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;
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data AExpr(loc src = |tmp:///|)
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= ref(AId id)
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| index(AId id, AExpr index)
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| slice(AId id, AExpr \start, AExpr end)
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| val(AValue val)
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| call(list[AExpr] args)
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| add(AExpr left, AExpr right)
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| sub(AExpr left, AExpr right)
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| mul(AExpr left, AExpr right)
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| div(AExpr left, AExpr right)
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| \mod(AExpr left, AExpr right)
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| intDiv(AExpr left, AExpr right)
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| negate(AExpr inner)
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;
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data AValue(loc src = |tmp:///|)
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= integer(int n)
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| \real(real n)
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;
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data AId(loc src = |tmp:///|)
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= id(str name);
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@ -0,0 +1,118 @@
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module CST2AST
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import Syntax;
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import AST;
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import String;
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import Exception;
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// TODO: Add source
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// -------------------------------- Top level program -----------------------
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AProgram cst2ast(start[Program] program) {
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// Remove layout
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Program p = program.top;
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return cst2ast(p);
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}
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AProgram cst2ast(Program p)
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= program(
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cst2ast(p.name),
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cst2ast(p.consts),
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cst2ast(p.vars),
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cst2ast(p.subProgs),
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cst2ast(p.main)
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);
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AId cst2ast(Id name)
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= id("<name>");
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// -------------------------------------- Declarations -----------------------
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list[AConst] cst2ast(ConstDecl* consts)
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= [cst2ast(const) | const <- consts];
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AConst cst2ast(ConstDecl cDecl)
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= const(cst2ast(cDecl.id), inferType(cDecl.\value), cst2ast(cDecl.\value));
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list[AVar] cst2ast(VarDecl* varDecls)
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= [aVar | varDecl <- varDecls, aVar <- cst2ast(varDecl)];
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list[AVar] cst2ast(VarDecl varDecl)
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= [var(cst2ast(id), cst2ast(varDecl.\type)) | id <- varDecl.ids];
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list[ASubProg] cst2ast(SubProgDecl* subProgs)
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= [cst2ast(subProg) | subProg <- subProgs];
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ASubProg cst2ast((SubProgDecl)`<FunctionDecl f>`)
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= function(
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cst2ast(f.id),
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cst2ast(f.params),
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simpleType(cst2ast(f.returnType)),
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cst2ast(f.locals),
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cst2ast(f.body)
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);
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ASubProg cst2ast((SubProgDecl)`<ProcedureDecl p>`)
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= procedure(
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cst2ast(p.id),
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cst2ast(p.params),
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cst2ast(p.locals),
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cst2ast(p.body)
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);
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list[AParam] cst2ast(Parameters? optParams)
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= [param | params <- optParams, param <- cst2ast(params)];
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list[AParam] cst2ast(Parameters params);
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// ---------------------------- Statement lists -----------------------------
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ABlock cst2ast(CompoundStatement body)
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= block([
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aStatement
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| statementList <- body.statementList,
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aStatement <- cst2ast(statementList)
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]);
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list[AStatement] cst2ast(StatementList sList)
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= [cst2ast(sList.first)]
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+ [cst2ast(statement) | item <- sList.rest, /Statement statement := item];
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// ----------------------------- Statements ----------------------------------
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AStatement cst2ast((Statement)`<Lhs lhs> := <Expr e>`)
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= assignment(cst2ast(lhs), cst2ast(e));
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AStatement cst2ast((Statement)`<SubProgCall subProgCall>`)
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= call(cst2ast(subProgCall));
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AStatement cst2ast((Statement)`<CompoundStatement compoundStatement>`)
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= blockStatement(cst2ast(compoundStatement));
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AStatement cst2ast((Statement)`skip`)
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= skip();
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AStatement cst2ast((Statement)`if <Guard g> then <Statement ifStmt> else <Statement elseStmt>`)
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= \if(cst2ast(g), cst2ast(ifStmt), cst2ast(elseStmt));
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AStatement cst2ast((Statement)`while <Guard g> do <Statement body>`)
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= \while(cst2ast(g), cst2ast(body));
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// -------------------------------- Calls ------------------------------------
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ASubProgCall cst2ast(SubProgCall call);
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// --------------------------------- Lhs ------------------------------------
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ALhs cst2ast(Lhs lhs);
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// ------------------------------ Expressions --------------------------------
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AExpr cst2ast(Expr e);
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AGuard cst2ast(Guard g);
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AValue cst2ast((Number)`<Integer n>`) = integer(toInt("<n>"));
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AValue cst2ast((Number)`<Real n>`) = \real(toReal("<n>"));
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// ----------------------------- Types ---------------------------------------
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AType cst2ast(TypeSpec \type);
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ABasicType cst2ast(BasicType \type);
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AType inferType((Number)`<Integer _>`) = simpleType(integerType());
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AType inferType((Number)`<Real _>`) = simpleType(realType());
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@ -0,0 +1,26 @@
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program robin;
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const cover = 1;
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const robins_skill = 0;
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const dogukan = 2;
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var player : integer;
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{ Prints 1 if Robin wins, 0 if it's a draw, -1 if robin loses }
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procedure smash(at : integer; opponents_skill : integer) ;
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BEGIN
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if (robins_skill > opponents_skill) then
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writeln(1)
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else
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if (robins_skill = opponents_skill) then
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writeln(0)
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else
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writeln(-1)
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END;
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BEGIN
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player := dogukan;
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smash(cover, player)
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END.
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