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Compound assign

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allexanderbergmns
2026-08-24 20:05:19 +02:00
parent 4b7a2f4c67
commit 7c7f4a69ff
3 changed files with 102 additions and 18 deletions
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compiler/parser.v
+48 -18
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@@ -435,26 +435,56 @@ fn (mut p Parser) parse_stmt() !Stmt {
} else {
e = p.parse_postfix_tail(Expr{ kind: .ident, name: t.lit, line: t.line })!
}
if p.cur().kind == .assign {
// assignment to an ident, an index, or a field
p.advance()
rhs := p.parse_expr()!
match e.kind {
.ident {
return Stmt{ kind: .assign_stmt, target: e.name, expr: rhs, line: t.line }
}
.index {
return Stmt{ kind: .index_assign, base: *e.left, idx: *e.right, expr: rhs, line: t.line }
}
.field {
return Stmt{ kind: .field_assign, base: *e.left, target: e.name, expr: rhs, line: t.line }
}
else {
return error('cannot assign to this expression (line ${t.line})')
}
if p.cur().kind == .assign {
// assignment to an ident, an index, or a field
p.advance()
rhs := p.parse_expr()!
match e.kind {
.ident {
return Stmt{ kind: .assign_stmt, target: e.name, expr: rhs, line: t.line }
}
.index {
return Stmt{ kind: .index_assign, base: *e.left, idx: *e.right, expr: rhs, line: t.line }
}
.field {
return Stmt{ kind: .field_assign, base: *e.left, target: e.name, expr: rhs, line: t.line }
}
else {
return error('cannot assign to this expression (line ${t.line})')
}
}
return Stmt{ kind: .expr_stmt, expr: e, line: t.line }
}
// compound assignment: x += expr, a[i] += expr, a.b += expr
if p.cur().kind == .plus_eq || p.cur().kind == .minus_eq || p.cur().kind == .star_eq || p.cur().kind == .slash_eq {
op_tok := p.advance()
rhs := p.parse_expr()!
bin_op := match op_tok.kind {
.plus_eq { TokKind.plus }
.minus_eq { TokKind.minus }
.star_eq { TokKind.star }
.slash_eq { TokKind.slash }
else { return error('unexpected compound operator (line ${t.line})') }
}
// desugar: LHS op= RHS → LHS = LHS op RHS
match e.kind {
.ident {
full_rhs := bin_node(bin_op, e, rhs, op_tok.line)
return Stmt{ kind: .assign_stmt, target: e.name, expr: full_rhs, line: t.line }
}
.index {
full_rhs := bin_node(bin_op, e, rhs, op_tok.line)
return Stmt{ kind: .index_assign, base: *e.left, idx: *e.right, expr: full_rhs, line: t.line }
}
.field {
full_rhs := bin_node(bin_op, e, rhs, op_tok.line)
return Stmt{ kind: .field_assign, base: *e.left, target: e.name, expr: full_rhs, line: t.line }
}
else {
return error('cannot use compound assignment on this expression (line ${t.line})')
}
}
}
return Stmt{ kind: .expr_stmt, expr: e, line: t.line }
}
.kw_print, .kw_println {
p.advance()