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class Codegen
types
values
instance variables
operations
public Generate : GiraffeSpecification ==> seq of char
Generate(spec) ==
let clazz : GiraffeClassDefinition = spec.getClazz(),
genClasses : seq of char = Generate(clazz)
in
return conc ["public class ", genClasses];
public Generate : GiraffeClassDefinition ==> seq of char
Generate(classDef) ==
let methods : set of GiraffeMethodDefinition = classDef.getMethods(),
mlist : seq of GiraffeMethodDefinition = VDMUtil`set2seq[GiraffeMethodDefinition](methods),
genMethods : seq of char = conc [Generate(mlist(i)) | i in set inds mlist]
in
return conc [classDef.getName().getName(), " { ", genMethods];--, " } "];
public Generate : GiraffeMethodDefinition ==> seq of char
Generate(method) ==
let params : seq of GiraffeParameter = method.getParameters(),
genParams : seq of char = conc tail(conc [[", ", Generate(params(i))] | i in set inds params]),
body : seq of GiraffeStatement = method.getBody(),
genBody : seq of char = conc conc [[Generate(body(i)), ";"] | i in set inds body]
in return conc ["public static ", Generate(method.getType()), " ", Generate(method.getName()), "(", genParams, ")", "{", genBody, "}"];
public Generate : GiraffeParameter ==> seq of char
Generate(param) == return conc [Generate(param.getType()), " ", param.getName().getName()];
public Generate : GiraffeType ==> seq of char
Generate(type) ==
if isofclass(GiraffeIdentifier, type) then
let i : GiraffeIdentifier = type
in return i.getName()
else
let t : GiraffeBasicType = type
in
cases t.name:
"INT" -> return "int",
"DOUBLE"-> return "double",
"BOOL" -> return "boolean",
others -> error
end;
public Generate : GiraffeStatement ==> seq of char
Generate(stm) ==
cases (true):
(isofclass(GiraffeVariableDeclStatement, stm)) ->
let s : GiraffeVariableDeclStatement = stm
in return conc [Generate(s.getType()), " ", Generate(s.getName()), " = ", GenerateExpression(s.getValue())],
(isofclass(GiraffeReturnStatement, stm)) -> let s : GiraffeReturnStatement = stm
in return conc ["return ", GenerateExpression(s.getValue())],
others -> error
end;
public GenerateExpression : GiraffeExpression ==> seq of char
GenerateExpression(exp) ==
cases (true):
(isofclass(GiraffeIntegerLiteralExpression, exp)) ->
let e : GiraffeIntegerLiteralExpression = exp
in return new codegen_Util().iToS(e.getValue()),
(isofclass(GiraffeVariableExpression, exp)) ->
let e : GiraffeVariableExpression = exp
in return e.getName().getName(),
(isofclass(GiraffeBinaryExpression, exp)) ->
let e : GiraffeBinaryExpression = exp
in return GenerateBinaryExpression(e),
(isofclass(GiraffeIfExpression, exp)) ->
let e : GiraffeIfExpression = exp
in return " ( (" ^ GenerateExpression(e.getTest()) ^ ") ? (" ^ GenerateExpression(e.getThn()) ^ ") : (" ^ GenerateExpression(e.getEls()) ^ ") ) ",
others -> error
end;
public GenerateBinaryExpression : GiraffeBinaryExpression ==> seq of char
GenerateBinaryExpression(binexp) ==
let op : GiraffeBinaryOperator = binexp.getOp(),
lhs : GiraffeExpression = binexp.getLhs(),
rhs : GiraffeExpression = binexp.getRhs()
in
cases op.name:
("EQUALS") -> return " ( " ^ GenerateExpression(lhs) ^ " == " ^ GenerateExpression(rhs) ^ " ) ",
("PLUS") -> return " ( " ^ GenerateExpression(lhs) ^ " + " ^ GenerateExpression(rhs) ^ " ) ",
others -> error
end;
functions
public tail : seq of seq of char -> seq of seq of char
tail(x) ==
if (x = []) then
[]
else
tl x;
end Codegen
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