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Beautify call_on_store!() macro syntax

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Matthias Beyer 2017-01-21 19:49:24 +01:00
parent 551b135436
commit 04363035c2
1 changed files with 84 additions and 43 deletions
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87
libimagruby/src/store.rs
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@ -72,35 +72,58 @@ macro_rules! call_on_store_by_handle {
}
macro_rules! call_on_store {
($itself:ident ($wrapper:ident) -> $name:ident fetch $fle_handle_name:ident -> $fle_name:ident -> $operation:block) => {{
call_on_store!($itself ($wrapper) -> $name fetch $fle_handle_name -> $fle_name -> $operation on fail return NilClass::new())
}};
($itself:ident ($wrapper:ident) -> $name:ident fetch $fle_handle_name:ident -> $fle_name:ident -> $operation:block on fail return $ex:expr) => {{
{
$store_name:ident <- $itself:ident wrapped inside $wrapper:ident,
$fle_name:ident <- fetch $fle_handle_name:ident
operation $operation:block
} => {
call_on_store! {
$store_name <- $itself wrapped inside $wrapper,
$fle_name <- fetch $fle_handle_name,
operation $operation,
on fail return NilClass::new()
}
};
{
$store_name:ident <- $itself:ident wrapped inside $wrapper:ident,
$fle_name:ident <- fetch $fle_handle_name:ident,
operation $operation:block,
on fail return $fail_expr:expr
} => {
let handle = $itself.get_data(&*$wrapper);
call_on_store_by_handle!(handle -> $name -> {
let $fle_name = match $name.get($fle_handle_name) {
call_on_store_by_handle!(handle -> $store_name -> {
let $fle_name = match $store_name.get($fle_handle_name) {
Ok(Some(fle)) => fle,
Ok(None) => {
VM::raise(Class::from_existing("RuntimeError"), "Obj does not exist");
return $ex
return $fail_expr
},
Err(e) => {
VM::raise(Class::from_existing("RuntimeError"), e.description());
return $ex
return $fail_expr
},
};
$operation
} on fail return $ex)
}};
} on fail return $fail_expr)
};
($itself:ident ($wrapper:ident) -> $name:ident -> $operation:block on fail return $ex:expr) => {{
{
$store_name:ident <- $itself:ident wrapped inside $wrapper:ident,
operation $operation:block,
on fail return $fail_expr:expr
} => {
let handle = $itself.get_data(&*$wrapper);
call_on_store_by_handle!(handle -> $name -> $operation on fail return $ex)
}};
($itself:ident ($wrapper:ident) -> $name:ident -> $operation:block) => {{
call_on_store_by_handle!(handle -> $store_name -> $operation on fail return $fail_expr)
};
{
$store_name:ident <- $itself:ident wrapped inside $wrapper:ident,
operation $block
} => {
let handle = $itself.get_data(&*$wrapper);
call_on_store_by_handle!(handle -> $name -> $operation)
}};
};
}
methods!(
@ -186,13 +209,18 @@ methods!(
let fle = typecheck!(fle).unwrap().clone();
let sid = typecheck!(sid).unwrap().clone();
call_on_store!(itself (STORE_WRAPPER) -> store fetch fle -> real_fle -> {
call_on_store! {
store <- itself wrapped inside STORE_WRAPPER,
real_fle <- fetch fle,
operation {
if let Err(e) = store.save_to(&real_fle, sid) {
trace_error(&e);
VM::raise(Class::from_existing("RuntimeError"), e.description());
}
NilClass::new()
} on fail return NilClass::new())
},
on fail return NilClass::new()
}
}
// Save a FileLockEntry in a new path inside the store, move the RFileLockEntry
@ -206,13 +234,18 @@ methods!(
let fle = typecheck!(fle).unwrap().clone();
let sid = typecheck!(sid).unwrap().clone();
call_on_store!(itself (STORE_WRAPPER) -> store fetch fle -> real_fle -> {
call_on_store! {
store <- itself wrapped inside STORE_WRAPPER,
real_fle <- fetch fle,
operation {
if let Err(e) = store.save_as(real_fle, sid) {
trace_error(&e);
VM::raise(Class::from_existing("RuntimeError"), e.description());
}
NilClass::new()
} on fail return NilClass::new())
},
on fail return NilClass::new()
}
}
// Move one entry in the store to another place, by its ID
@ -226,13 +259,17 @@ methods!(
let old = typecheck!(old).unwrap().clone();
let nw = typecheck!(nw).unwrap().clone();
call_on_store!(itself (STORE_WRAPPER) -> store -> {
call_on_store! {
store <- itself wrapped inside STORE_WRAPPER,
operation {
if let Err(e) = store.move_by_id(old, nw) {
trace_error(&e);
VM::raise(Class::from_existing("RuntimeError"), e.description());
}
NilClass::new()
} on fail return NilClass::new())
},
on fail return NilClass::new()
}
}
// Get the path of the store object
@ -242,13 +279,17 @@ methods!(
// A RString
//
fn path() -> RString {
call_on_store!(itself (STORE_WRAPPER) -> store -> {
call_on_store! {
store <- itself wrapped inside STORE_WRAPPER,
operation {
store.path()
.clone()
.to_str()
.map(RString::new)
.unwrap_or(RString::new(""))
} on fail return RString::new(""))
},
on fail return RString::new("")
}
}
);