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Statements and State 8

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nazrin 2025-06-01 19:53:00 +00:00
parent f4338ba51f
commit e749367886
7 changed files with 250 additions and 69 deletions
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82
src/jlox/expr.d
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@ -12,10 +12,12 @@ import jlox.util;
abstract class Expr{
interface Visitor(R){
R visit(Assign expr);
R visit(Binary expr);
R visit(Grouping expr);
R visit(Literal expr);
R visit(Unary expr);
R visit(Variable expr);
}
private alias rTypes = AliasSeq!(string, TValue);
static foreach(T; rTypes)
@ -26,63 +28,61 @@ abstract class Expr{
override T accept(Visitor!T visitor) => visitor.visit(this);
}
static class Binary : Expr{
static class Assign : typeof(this){
Token name;
Expr value;
mixin defCtorAndAccept;
}
static class Binary : typeof(this){
Expr left;
Token operator;
Expr right;
mixin defCtorAndAccept;
}
static class Grouping : Expr{
static class Grouping : typeof(this){
Expr expression;
mixin defCtorAndAccept;
}
static class Literal : Expr{
static class Literal : typeof(this){
TValue value;
mixin defCtorAndAccept;
}
static class Unary : Expr{
static class Unary : typeof(this){
Token operator;
Expr right;
mixin defCtorAndAccept;
}
}
class AstPrinter : Expr.Visitor!string{
string print(Expr expr){
return expr.accept(this);
}
string parenthesize(Args...)(string name, Args args){
string s = "(" ~ name;
static foreach(expr; args){
s ~= " ";
s ~= expr.accept(this);
}
return s ~ ")";
}
string visit(Expr.Binary expr){
return parenthesize(expr.operator.lexeme, expr.left, expr.right);
}
string visit(Expr.Grouping expr){
return parenthesize("group", expr.expression);
}
string visit(Expr.Literal expr){
if(expr.value.isNil)
return "nil";
return expr.value.to!string;
}
string visit(Expr.Unary expr){
return parenthesize(expr.operator.lexeme, expr.right);
static class Variable : typeof(this){
Token name;
mixin defCtorAndAccept;
}
}
unittest{
auto expression = new Expr.Binary(
new Expr.Unary(
new Token(TokenType.MINUS, "-", TValue.nil(0), 1),
new Expr.Literal(123)),
new Token(TokenType.STAR, "*", TValue.nil(0), 1),
new Expr.Grouping(
new Expr.Literal(45.67)));
assert(new AstPrinter().print(expression));
}
/* class AstPrinter : Expr.Visitor!string{ */
/* string print(Expr expr){ */
/* return expr.accept(this); */
/* } */
/* string parenthesize(Args...)(string name, Args args){ */
/* string s = "(" ~ name; */
/* static foreach(expr; args){ */
/* s ~= " "; */
/* s ~= expr.accept(this); */
/* } */
/* return s ~ ")"; */
/* } */
/* string visit(Expr.Binary expr){ */
/* return parenthesize(expr.operator.lexeme, expr.left, expr.right); */
/* } */
/* string visit(Expr.Grouping expr){ */
/* return parenthesize("group", expr.expression); */
/* } */
/* string visit(Expr.Literal expr){ */
/* if(expr.value.isNil) */
/* return "nil"; */
/* return expr.value.to!string; */
/* } */
/* string visit(Expr.Unary expr){ */
/* return parenthesize(expr.operator.lexeme, expr.right); */
/* } */
/* } */