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gen: restructure if guard to support else

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This commit is contained in:
Joe Conigliaro 2020-03-18 04:01:36 +11:00
parent 91e47caf38
commit 330745da30
1 changed files with 9 additions and 3 deletions
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12
vlib/v/gen/cgen.v
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@ -1083,13 +1083,15 @@ fn (g mut Gen) if_expr(node ast.IfExpr) {
}
else {
mut is_guard := false
guard_ok := g.new_tmp_var()
match node.cond {
ast.IfGuardExpr {
is_guard = true
g.write('/* if guard */{${g.typ(it.expr_type)} $it.var_name = ')
g.writeln('bool $guard_ok;')
g.write('{ /* if guard */ ${g.typ(it.expr_type)} $it.var_name = ')
g.expr(it.expr)
g.writeln(';')
g.writeln('if (${it.var_name}.ok) {')
g.writeln('if (($guard_ok = ${it.var_name}.ok)) {')
}
else {
g.write('if (')
@ -1108,7 +1110,11 @@ fn (g mut Gen) if_expr(node ast.IfExpr) {
}
g.writeln('}')
if node.else_stmts.len > 0 {
g.writeln('else { ')
if is_guard {
g.writeln('if !$guard_ok { /* else */')
} else {
g.writeln('else { ')
}
for stmt in node.else_stmts {
g.stmt(stmt)
}