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[Tolk] bool type (-1/0 int under the hood)

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Comparison operators `== / >= /...` return `bool`.
Logical operators `&& ||` return bool.
Constants `true` and `false` have the `bool` type.
Lots of stdlib functions return `bool`, not `int`.

Operator `!x` supports both `int` and `bool`.
Condition of `if` accepts both `int` and `bool`.
Arithmetic operators are restricted to integers.
Logical `&&` and `||` accept both `bool` and `int`.

No arithmetic operations with bools allowed (only bitwise and logical).
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tolk-vm 2025-01-13 15:21:24 +07:00
parent 799e2d1265
commit 974d76c5f6
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GPG key ID: 7905DD7FE0324B12
33 changed files with 764 additions and 212 deletions
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13
tolk/ast-from-tokens.cpp
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@ -673,25 +673,20 @@ static AnyV parse_return_statement(Lexer& lex) {
return createV<ast_return_statement>(loc, child);
}
static AnyV parse_if_statement(Lexer& lex, bool is_ifnot) {
static AnyV parse_if_statement(Lexer& lex) {
SrcLocation loc = lex.cur_location();
lex.expect(tok_if, "`if`");
lex.expect(tok_oppar, "`(`");
AnyExprV cond = parse_expr(lex);
lex.expect(tok_clpar, "`)`");
// replace if(!expr) with ifnot(expr) (this should be done later, but for now, let this be right at parsing time)
if (auto v_not = cond->try_as<ast_unary_operator>(); v_not && v_not->tok == tok_logical_not) {
is_ifnot = !is_ifnot;
cond = v_not->get_rhs();
}
V<ast_sequence> if_body = parse_sequence(lex);
V<ast_sequence> else_body = nullptr;
if (lex.tok() == tok_else) { // else if(e) { } or else { }
lex.next();
if (lex.tok() == tok_if) {
AnyV v_inner_if = parse_if_statement(lex, false);
AnyV v_inner_if = parse_if_statement(lex);
else_body = createV<ast_sequence>(v_inner_if->loc, lex.cur_location(), {v_inner_if});
} else {
else_body = parse_sequence(lex);
@ -699,7 +694,7 @@ static AnyV parse_if_statement(Lexer& lex, bool is_ifnot) {
} else { // no 'else', create empty block
else_body = createV<ast_sequence>(lex.cur_location(), lex.cur_location(), {});
}
return createV<ast_if_statement>(loc, is_ifnot, cond, if_body, else_body);
return createV<ast_if_statement>(loc, false, cond, if_body, else_body);
}
static AnyV parse_repeat_statement(Lexer& lex) {
@ -838,7 +833,7 @@ AnyV parse_statement(Lexer& lex) {
case tok_return:
return parse_return_statement(lex);
case tok_if:
return parse_if_statement(lex, false);
return parse_if_statement(lex);
case tok_repeat:
return parse_repeat_statement(lex);
case tok_do: