macros: Merge all element children into a common syntax.
This commit is contained in:
Emmanuel Gil Peyrot
parent
cbef3f6e8d
commit
a625b88fce
8 changed files with 200 additions and 490 deletions
211
src/macros.rs
211
src/macros.rs
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@ -424,14 +424,96 @@ macro_rules! generate_element_with_text {
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);
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}
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macro_rules! start_decl {
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(Vec, $type:ty) => (
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Vec<$type>
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);
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(Option, $type:ty) => (
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Option<$type>
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);
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(Required, $type:ty) => (
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$type
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);
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}
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macro_rules! start_parse_elem {
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($temp:ident: Vec) => (
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let mut $temp = Vec::new();
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);
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($temp:ident: Option) => (
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let mut $temp = None;
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);
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($temp:ident: Required) => (
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let mut $temp = None;
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);
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}
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macro_rules! do_parse {
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($elem:ident, Element) => (
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$elem.clone()
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);
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($elem:ident, String) => (
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$elem.text()
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);
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($elem:ident, $constructor:ident) => (
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$constructor::try_from($elem.clone())?
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);
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}
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macro_rules! do_parse_elem {
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($temp:ident: Vec = $constructor:ident => $elem:ident) => (
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$temp.push(do_parse!($elem, $constructor));
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);
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($temp:ident: Option = $constructor:ident => $elem:ident) => (
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if $temp.is_some() {
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return Err(::error::Error::ParseError(concat!("coucou", " must not have more than one ", "coucou", ".")));
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}
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$temp = Some(do_parse!($elem, $constructor));
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);
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($temp:ident: Required = $constructor:ident => $elem:ident) => (
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$temp = Some(do_parse!($elem, $constructor));
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);
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}
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macro_rules! finish_parse_elem {
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($temp:ident: Vec = $name:tt) => (
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$temp
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);
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($temp:ident: Option = $name:tt) => (
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$temp
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);
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($temp:ident: Required = $name:tt) => (
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$temp.ok_or(::error::Error::ParseError(concat!("Missing child coucou in ", $name, " element.")))?
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);
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}
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macro_rules! generate_serialiser {
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($parent:ident, $elem:ident, Required, String, ($name:tt, $ns:ident)) => (
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::minidom::Element::builder($name)
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.ns(::ns::$ns)
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.append($parent.$elem)
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.build()
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);
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($parent:ident, $elem:ident, Option, String, ($name:tt, $ns:ident)) => (
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$parent.$elem.map(|elem|
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::minidom::Element::builder($name)
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.ns(::ns::$ns)
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.append(elem)
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.build())
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);
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($parent:ident, $elem:ident, $_:ident, $constructor:ident, ($name:tt, $ns:ident)) => (
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$parent.$elem
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);
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}
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macro_rules! generate_element_with_children {
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($(#[$meta:meta])* $elem:ident, $name:tt, $ns:ident, children: [$($(#[$child_meta:meta])* $child_ident:ident: Vec<$child_type:ty> = ($child_name:tt, $child_ns:ident) => $child_constructor:ident),+]) => (
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generate_element_with_children!($(#[$meta])* $elem, $name, $ns, attributes: [], children: [$($(#[$child_meta])* $child_ident: Vec<$child_type> = ($child_name, $child_ns) => $child_constructor),+]);
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($(#[$meta:meta])* $elem:ident, $name:tt, $ns:ident, children: [$($(#[$child_meta:meta])* $child_ident:ident: $coucou:tt<$child_type:ty> = ($child_name:tt, $child_ns:ident) => $child_constructor:ident),+]) => (
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generate_element_with_children!($(#[$meta])* $elem, $name, $ns, attributes: [], children: [$($(#[$child_meta])* $child_ident: $coucou<$child_type> = ($child_name, $child_ns) => $child_constructor),+]);
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);
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($(#[$meta:meta])* $elem:ident, $name:tt, $ns:ident, attributes: [$($(#[$attr_meta:meta])* $attr:ident: $attr_type:ty = $attr_name:tt => $attr_action:tt),*,], children: [$($(#[$child_meta:meta])* $child_ident:ident: Vec<$child_type:ty> = ($child_name:tt, $child_ns:ident) => $child_constructor:ident),+]) => (
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generate_element_with_children!($(#[$meta])* $elem, $name, $ns, attributes: [$($(#[$attr_meta])* $attr: $attr_type = $attr_name => $attr_action),*], children: [$($(#[$child_meta])* $child_ident: Vec<$child_type> = ($child_name, $child_ns) => $child_constructor),+]);
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($(#[$meta:meta])* $elem:ident, $name:tt, $ns:ident, attributes: [$($(#[$attr_meta:meta])* $attr:ident: $attr_type:ty = $attr_name:tt => $attr_action:tt),*,], children: [$($(#[$child_meta:meta])* $child_ident:ident: $coucou:tt<$child_type:ty> = ($child_name:tt, $child_ns:ident) => $child_constructor:ident),+]) => (
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generate_element_with_children!($(#[$meta])* $elem, $name, $ns, attributes: [$($(#[$attr_meta])* $attr: $attr_type = $attr_name => $attr_action),*], children: [$($(#[$child_meta])* $child_ident: $coucou<$child_type> = ($child_name, $child_ns) => $child_constructor),+]);
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);
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($(#[$meta:meta])* $elem:ident, $name:tt, $ns:ident, attributes: [$($(#[$attr_meta:meta])* $attr:ident: $attr_type:ty = $attr_name:tt => $attr_action:tt),*], children: [$($(#[$child_meta:meta])* $child_ident:ident: Vec<$child_type:ty> = ($child_name:tt, $child_ns:ident) => $child_constructor:ident),+]) => (
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($(#[$meta:meta])* $elem:ident, $name:tt, $ns:ident, attributes: [$($(#[$attr_meta:meta])* $attr:ident: $attr_type:ty = $attr_name:tt => $attr_action:tt),*], children: [$($(#[$child_meta:meta])* $child_ident:ident: $coucou:tt<$child_type:ty> = ($child_name:tt, $child_ns:ident) => $child_constructor:ident),+]) => (
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$(#[$meta])*
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#[derive(Debug, Clone)]
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pub struct $elem {
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@ -441,7 +523,7 @@ macro_rules! generate_element_with_children {
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)*
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$(
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$(#[$child_meta])*
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pub $child_ident: Vec<$child_type>,
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pub $child_ident: start_decl!($coucou, $child_type),
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)*
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}
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@ -451,12 +533,13 @@ macro_rules! generate_element_with_children {
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fn try_from(elem: ::minidom::Element) -> Result<$elem, ::error::Error> {
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check_self!(elem, $name, $ns);
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check_no_unknown_attributes!(elem, $name, [$($attr_name),*]);
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let mut parsed_children = vec!();
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$(
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start_parse_elem!($child_ident: $coucou);
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)*
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for child in elem.children() {
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$(
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if child.is($child_name, ::ns::$child_ns) {
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let parsed_child = $child_constructor::try_from(child.clone())?;
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parsed_children.push(parsed_child);
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do_parse_elem!($child_ident: $coucou = $child_constructor => child);
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continue;
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}
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)*
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@ -467,7 +550,7 @@ macro_rules! generate_element_with_children {
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$attr: get_attr!(elem, $attr_name, $attr_action),
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)*
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$(
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$child_ident: parsed_children,
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$child_ident: finish_parse_elem!($child_ident: $coucou = $child_name),
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)*
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})
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}
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@ -481,116 +564,10 @@ macro_rules! generate_element_with_children {
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.attr($attr_name, elem.$attr)
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)*
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$(
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.append(elem.$child_ident)
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.append(generate_serialiser!(elem, $child_ident, $coucou, $child_constructor, ($child_name, $child_ns)))
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)*
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.build()
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}
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}
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);
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($(#[$meta:meta])* $elem:ident, $name:tt, $ns:ident, child: ($(#[$child_meta:meta])* $child_ident:ident: Option<$child_type:ty> = ($child_name:tt, $child_ns:ident) => $child_constructor:ident)) => (
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generate_element_with_children!($(#[$meta])* $elem, $name, $ns, attributes: [], child: ($(#[$child_meta])* $child_ident: Option<$child_type> = ($child_name, $child_ns) => $child_constructor));
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);
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($(#[$meta:meta])* $elem:ident, $name:tt, $ns:ident, attributes: [$($(#[$attr_meta:meta])* $attr:ident: $attr_type:ty = $attr_name:tt => $attr_action:tt),*,], child: ($(#[$child_meta:meta])* $child_ident:ident: Option<$child_type:ty> = ($child_name:tt, $child_ns:ident) => $child_constructor:ident)) => (
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generate_element_with_children!($(#[$meta])* $elem, $name, $ns, attributes: [$($(#[$attr_meta])* $attr: $attr_type = $attr_name => $attr_action),*], child: ($(#[$child_meta])* $child_ident: Option<$child_type> = ($child_name, $child_ns) => $child_constructor));
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);
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($(#[$meta:meta])* $elem:ident, $name:tt, $ns:ident, attributes: [$($(#[$attr_meta:meta])* $attr:ident: $attr_type:ty = $attr_name:tt => $attr_action:tt),*], child: ($(#[$child_meta:meta])* $child_ident:ident: Option<$child_type:ty> = ($child_name:tt, $child_ns:ident) => $child_constructor:ident)) => (
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$(#[$meta])*
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#[derive(Debug, Clone)]
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pub struct $elem {
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$(
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$(#[$attr_meta])*
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pub $attr: $attr_type,
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)*
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$(#[$child_meta])*
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pub $child_ident: Option<$child_type>,
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}
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impl ::try_from::TryFrom<::minidom::Element> for $elem {
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type Err = ::error::Error;
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fn try_from(elem: ::minidom::Element) -> Result<$elem, ::error::Error> {
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check_self!(elem, $name, $ns);
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check_no_unknown_attributes!(elem, $name, [$($attr_name),*]);
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let mut parsed_child = None;
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for child in elem.children() {
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if child.is($child_name, ::ns::$child_ns) {
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parsed_child = Some($child_constructor::try_from(child.clone())?);
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continue;
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}
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return Err(::error::Error::ParseError(concat!("Unknown child in ", $name, " element.")));
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}
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Ok($elem {
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$(
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$attr: get_attr!(elem, $attr_name, $attr_action),
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)*
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$child_ident: parsed_child,
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})
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}
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}
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impl From<$elem> for ::minidom::Element {
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fn from(elem: $elem) -> ::minidom::Element {
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::minidom::Element::builder($name)
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.ns(::ns::$ns)
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$(
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.attr($attr_name, elem.$attr)
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)*
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.append(elem.$child_ident)
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.build()
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}
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}
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);
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($(#[$meta:meta])* $elem:ident, $name:tt, $ns:ident, child: ($(#[$child_meta:meta])* $child_ident:ident: $child_type:ty = ($child_name:tt, $child_ns:ident) => $child_constructor:ident)) => (
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generate_element_with_children!($(#[$meta])* $elem, $name, $ns, attributes: [], child: ($(#[$child_meta])* $child_ident: $child_type = ($child_name, $child_ns) => $child_constructor));
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);
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($(#[$meta:meta])* $elem:ident, $name:tt, $ns:ident, attributes: [$($(#[$attr_meta:meta])* $attr:ident: $attr_type:ty = $attr_name:tt => $attr_action:tt),*,], child: ($(#[$child_meta:meta])* $child_ident:ident: $child_type:ty = ($child_name:tt, $child_ns:ident) => $child_constructor:ident)) => (
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generate_element_with_children!($(#[$meta])* $elem, $name, $ns, attributes: [$($(#[$attr_meta])* $attr: $attr_type = $attr_name => $attr_action),*], child: ($(#[$child_meta])* $child_ident: $child_type = ($child_name, $child_ns) => $child_constructor));
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);
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($(#[$meta:meta])* $elem:ident, $name:tt, $ns:ident, attributes: [$($(#[$attr_meta:meta])* $attr:ident: $attr_type:ty = $attr_name:tt => $attr_action:tt),*], child: ($(#[$child_meta:meta])* $child_ident:ident: $child_type:ty = ($child_name:tt, $child_ns:ident) => $child_constructor:ident)) => (
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$(#[$meta])*
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#[derive(Debug, Clone)]
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pub struct $elem {
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$(
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$(#[$attr_meta])*
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pub $attr: $attr_type,
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)*
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$(#[$child_meta])*
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pub $child_ident: $child_type,
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}
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impl ::try_from::TryFrom<::minidom::Element> for $elem {
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type Err = ::error::Error;
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fn try_from(elem: ::minidom::Element) -> Result<$elem, ::error::Error> {
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check_self!(elem, $name, $ns);
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check_no_unknown_attributes!(elem, $name, [$($attr_name),*]);
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let mut parsed_child = None;
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for child in elem.children() {
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if child.is($child_name, ::ns::$child_ns) {
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parsed_child = Some($child_constructor::try_from(child.clone())?);
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continue;
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}
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return Err(::error::Error::ParseError(concat!("Unknown child in ", $name, " element.")));
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}
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Ok($elem {
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$(
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$attr: get_attr!(elem, $attr_name, $attr_action),
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)*
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$child_ident: parsed_child.ok_or(::error::Error::ParseError(concat!("Missing child ", $child_name, " in ", $name, " element.")))?,
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})
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}
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}
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impl From<$elem> for ::minidom::Element {
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fn from(elem: $elem) -> ::minidom::Element {
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::minidom::Element::builder($name)
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.ns(::ns::$ns)
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$(
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.attr($attr_name, elem.$attr)
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)*
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.append(elem.$child_ident)
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.build()
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}
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}
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);
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}
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