protected override BlockTargetWriter CreateForLoop(string indexVar, string bound, TargetWriter wr)
{
wr.Indent();
var w = wr.NewNamedBlock("for (let {0} = 0; {0} < {1}; {0}++)", indexVar, bound);
return(w);
}
protected override TargetWriter CreateIIFE(string source, Type sourceType, Bpl.IToken sourceTok, Type resultType, Bpl.IToken resultTok, string bvName, TargetWriter wr)
{
var w = wr.NewNamedBlock("function ({0})", bvName);
w.SetBraceStyle(BlockTargetWriter.BraceStyle.Space, BlockTargetWriter.BraceStyle.Nothing);
w.Indent();
w.Write("return ");
w.BodySuffix = ";" + w.NewLine;
wr.Write("({0})", source);
return(w);
}
// ----- Declarations -------------------------------------------------------------
protected override void DeclareField(string name, bool isStatic, bool isConst, Type type, Bpl.IToken tok, string rhs, TargetWriter wr)
{
wr.Indent();
if (isStatic)
{
var w = wr.NewNamedBlock("static get {0}()", name);
EmitReturnExpr(rhs, w);
}
else
{
wr.WriteLine("this.{0} = {1};", name, rhs);
}
}
protected override void DeclareDatatype(DatatypeDecl dt, TargetWriter wr)
{
// $module.Dt = class Dt {
// constructor(tag) {
// this.$tag = tag;
// }
// static create_Ctor0(field0, field1, ...) {
// let $dt = new Dt(0);
// $dt.field0 = field0;
// $dt.field1 = field1;
// ...
// return $dt;
// }
// static create_Ctor1(...) {
// let $dt = new Dt(1);
// ...
// }
// ...
//
// get is_Ctor0 { return this.$tag == 0; }
// get is_Ctor1 { return this.$tag == 1; }
// ...
//
// toString() {
// ...
// }
// equals(other) {
// ...
// }
// }
// TODO: need Default member (also for co-datatypes)
// TODO: if HasFinitePossibleValues, need enumerator of values
string DtT = dt.CompileName;
string DtT_protected = IdProtect(DtT);
wr.Indent();
// from here on, write everything into the new block created here:
wr = wr.NewNamedBlock("$module.{0} = class {0}", DtT_protected);
wr.Indent();
wr.WriteLine("constructor(tag) { this.$tag = tag; }");
// query properties
var i = 0;
foreach (var ctor in dt.Ctors)
{
// collect the names of non-ghost arguments
var argNames = new List <string>();
var k = 0;
foreach (var formal in ctor.Formals)
{
if (!formal.IsGhost)
{
argNames.Add(FormalName(formal, k));
k++;
}
}
// static create_Ctor0(params) { return {$tag:0, p0: pararms0, p1: params1, ...}; }
wr.Indent();
wr.Write("static create_{0}(", ctor.CompileName);
wr.Write(Util.Comma(argNames, nm => nm));
var w = wr.NewBlock(")");
w.Indent();
w.WriteLine("let $dt = new {0}({1});", DtT_protected, i);
foreach (var arg in argNames)
{
w.Indent();
w.WriteLine("$dt.{0} = {0};", arg);
}
w.Indent();
w.WriteLine("return $dt;");
i++;
}
// query properties
i = 0;
foreach (var ctor in dt.Ctors)
{
// get is_Ctor0() { return _D is Dt_Ctor0; }
wr.Indent();
wr.WriteLine("get is_{0}() {{ return this.$tag === {1}; }}", ctor.CompileName, i);
i++;
}
if (dt is IndDatatypeDecl && !(dt is TupleTypeDecl))
{
// toString method
wr.Indent();
var w = wr.NewBlock("toString()");
i = 0;
foreach (var ctor in dt.Ctors)
{
var cw = EmitIf(string.Format("this.$tag == {0}", i), true, w);
cw.Indent();
cw.Write("return \"{0}.{1}\"", dt.Name, ctor.Name);
var sep = " + \"(\" + ";
var anyFormals = false;
var k = 0;
foreach (var arg in ctor.Formals)
{
if (!arg.IsGhost)
{
anyFormals = true;
cw.Write("{0}this.{1}.toString()", sep, FormalName(arg, k));
sep = " + \", \" + ";
k++;
}
}
if (anyFormals)
{
cw.Write(" + \")\"");
}
cw.WriteLine(";");
i++;
}
w = w.NewBlock("");
w.Indent();
w.WriteLine("return \"<unexpected>\";");
}
// equals method
wr.Indent();
using (var w = wr.NewBlock("equals(other)")) {
using (var thn = EmitIf("this === other", true, w)) {
EmitReturnExpr("true", thn);
}
i = 0;
foreach (var ctor in dt.Ctors)
{
var thn = EmitIf(string.Format("this.$tag == {0}", i), true, w);
using (var guard = new TargetWriter()) {
guard.Write("other.$tag == {0}", i);
var k = 0;
foreach (Formal arg in ctor.Formals)
{
if (!arg.IsGhost)
{
string nm = FormalName(arg, k);
if (IsDirectlyComparable(arg.Type))
{
guard.Write(" && this.{0} === oth.{0}", nm);
}
else
{
guard.Write(" && _dafny.areEqual(this.{0}, other.{0})", nm);
}
k++;
}
}
EmitReturnExpr(guard.ToString(), thn);
}
i++;
}
using (var els = w.NewBlock("")) {
els.Indent();
els.WriteLine("return false; // unexpected");
}
}
}