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xo-reader: refactor: mv admits_singleassign -> define_xs

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This commit is contained in:
Roland Conybeare 2024-08-08 12:16:59 -04:00
commit 762aa0016a
2 changed files with 55 additions and 0 deletions
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1
include/xo/reader/define_xs.hpp
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@ -24,6 +24,7 @@ namespace xo {
virtual bool admits_symbol() const override; virtual bool admits_symbol() const override;
virtual bool admits_colon() const override; virtual bool admits_colon() const override;
virtual bool admits_semicolon() const override; virtual bool admits_semicolon() const override;
virtual bool admits_singleassign() const override;
// virtual void on_f64(..) override // virtual void on_f64(..) override
virtual void on_expr(ref::brw<Expression> expr, virtual void on_expr(ref::brw<Expression> expr,

54
src/reader/define_xs.cpp
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@ -146,6 +146,60 @@ namespace xo {
return false; return false;
} }
bool
define_xs::admits_singleassign() const {
switch (exs_type_) {
case exprstatetype::expect_toplevel_expression_sequence:
/* unreachable */
assert(false);
return false;
/*
* def foo = 1 ;
* def foo : f64 = 1 ;
* ^ ^ ^ ^ ^ ^ ^
* | | | | | | (done)
* | | | | | def_4:expect_rhs_expression
* | | | | def_3
* | | | def_2:expect_type
* | | def_1
* | def_0:expect_symbol
* expect_toplevel_expression_sequence
*
* note that we skip from def_1 -> def_4 if '=' instead of ':'
*/
case exprstatetype::def_0:
return false;
case exprstatetype::def_1:
return true;
case exprstatetype::def_2:
return false;
case exprstatetype::def_3:
return true;
case exprstatetype::def_4:
case exprstatetype::def_5:
return false;
case exprstatetype::lparen_0:
case exprstatetype::lparen_1:
case exprstatetype::expect_rhs_expression:
case exprstatetype::expect_symbol:
case exprstatetype::expect_type:
case exprstatetype::expr_progress:
case exprstatetype::invalid:
case exprstatetype::n_exprstatetype:
/* unreachable */
/* unreachable */
assert(false);
return false;
}
return false;
}
void void
define_xs::on_expr(ref::brw<Expression> expr, define_xs::on_expr(ref::brw<Expression> expr,
exprstatestack * /* p_stack */, exprstatestack * /* p_stack */,