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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use std::io::Write;
use syn;
use bindgen::config::Config;
use bindgen::writer::SourceWriter;
enum DefineKey<'a> {
Boolean(&'a str),
Named(&'a str, &'a str),
}
impl<'a> DefineKey<'a> {
fn load(key: &str) -> DefineKey {
// TODO - dirty parser
if key.contains("=") {
let mut splits = key.trim().split("=");
let name = if let Some(name) = splits.next() {
name.trim()
} else {
return DefineKey::Boolean(key);
};
let value = if let Some(value) = splits.next() {
value.trim()
} else {
return DefineKey::Boolean(key);
};
if splits.next().is_some() {
return DefineKey::Boolean(key);
}
DefineKey::Named(name, value)
} else {
return DefineKey::Boolean(key);
}
}
}
#[derive(Debug, Clone)]
pub enum Cfg {
Boolean(String),
Named(String, String),
Any(Vec<Cfg>),
All(Vec<Cfg>),
Not(Box<Cfg>),
}
impl Cfg {
pub fn join(cfgs: &[Cfg]) -> Option<Cfg> {
if cfgs.len() == 0 {
None
} else {
Some(Cfg::All(cfgs.to_owned()))
}
}
pub fn append(parent: &Option<Cfg>, child: Option<Cfg>) -> Option<Cfg> {
match (parent, child) {
(&None, None) => {
None
}
(&None, Some(child)) => {
Some(child)
}
(&Some(ref parent), None) => {
Some(parent.clone())
}
(&Some(ref parent), Some(ref child)) => {
Some(Cfg::All(vec![parent.clone(), child.clone()]))
}
}
}
pub fn load(attrs: &Vec<syn::Attribute>) -> Option<Cfg> {
let mut configs = Vec::new();
for attr in attrs {
if attr.is_sugared_doc {
continue;
}
match &attr.value {
&syn::MetaItem::Word(..) => { }
&syn::MetaItem::NameValue(..) => { }
&syn::MetaItem::List(ref ident, ref nested) => {
if ident.as_ref() != "cfg" ||
nested.len() != 1 {
continue;
}
if let Some(config) = Cfg::load_single(&nested[0]) {
configs.push(config);
}
}
}
}
match configs.len() {
0 => None,
1 => Some(configs.pop().unwrap()),
_ => Some(Cfg::All(configs)),
}
}
fn load_single(item: &syn::NestedMetaItem) -> Option<Cfg> {
match item {
&syn::NestedMetaItem::MetaItem(syn::MetaItem::Word(ref ident)) => {
Some(Cfg::Boolean(ident.as_ref().to_owned()))
}
&syn::NestedMetaItem::MetaItem(syn::MetaItem::NameValue(ref ident, ref value)) => {
match value {
&syn::Lit::Str(ref value, _) => {
Some(Cfg::Named(ident.as_ref().to_owned(),
value.clone()))
}
_ => {
None
}
}
}
&syn::NestedMetaItem::MetaItem(syn::MetaItem::List(ref ident, ref nested)) => {
match ident.as_ref() {
"any" => {
if let Some(configs) = Cfg::load_list(nested) {
Some(Cfg::Any(configs))
} else {
None
}
}
"all" => {
if let Some(configs) = Cfg::load_list(nested) {
Some(Cfg::All(configs))
} else {
None
}
}
"not" => {
if nested.len() != 1 {
return None;
}
if let Some(config) = Cfg::load_single(&nested[0]) {
Some(Cfg::Not(Box::new(config)))
} else {
None
}
}
_ => {
None
}
}
}
_ => { None }
}
}
fn load_list(attrs: &Vec<syn::NestedMetaItem>) -> Option<Vec<Cfg>> {
if attrs.len() == 0 {
return None;
}
let mut configs = Vec::new();
for attr in attrs {
if let Some(config) = Cfg::load_single(attr) {
configs.push(config);
} else {
return None;
}
}
Some(configs)
}
fn has_defines(&self, config: &Config) -> bool {
match self {
&Cfg::Boolean(ref cfg_name) => {
for (key, ..) in &config.defines {
let key = DefineKey::load(key);
match key {
DefineKey::Boolean(key_name) => {
if cfg_name == key_name {
return true;
}
}
DefineKey::Named(..) => { }
}
}
false
}
&Cfg::Named(ref cfg_name, ref cfg_value) => {
for (key, ..) in &config.defines {
let key = DefineKey::load(key);
match key {
DefineKey::Boolean(..) => { }
DefineKey::Named(key_name, key_value) => {
if cfg_name == key_name &&
cfg_value == key_value {
return true;
}
}
}
}
false
}
&Cfg::Any(ref cfgs) => {
cfgs.iter().all(|x| x.has_defines(config))
}
&Cfg::All(ref cfgs) => {
cfgs.iter().all(|x| x.has_defines(config))
}
&Cfg::Not(ref cfg) => {
cfg.has_defines(config)
}
}
}
fn write_condition<F: Write>(&self, config: &Config, out: &mut SourceWriter<F>) {
match self {
&Cfg::Boolean(ref cfg_name) => {
let mut define: &str = cfg_name;
for (key, define_value) in &config.defines {
let key = DefineKey::load(key);
match key {
DefineKey::Boolean(key_name) => {
if cfg_name == key_name {
define = define_value;
}
}
DefineKey::Named(..) => { }
}
}
out.write("defined(");
out.write(define);
out.write(")");
}
&Cfg::Named(ref cfg_name, ref cfg_value) => {
let mut define: &str = cfg_name;
for (key, define_value) in &config.defines {
let key = DefineKey::load(key);
match key {
DefineKey::Boolean(..) => { }
DefineKey::Named(key_name, key_value) => {
if cfg_name == key_name &&
cfg_value == key_value {
define = define_value;
}
}
}
}
out.write("defined(");
out.write(define);
out.write(")");
}
&Cfg::Any(ref cfgs) => {
out.write("(");
for (i, cfg) in cfgs.iter().enumerate() {
if i != 0 {
out.write(" || ");
}
cfg.write_condition(config, out);
}
out.write(")");
}
&Cfg::All(ref cfgs) => {
out.write("(");
for (i, cfg) in cfgs.iter().enumerate() {
if i != 0 {
out.write(" && ");
}
cfg.write_condition(config, out);
}
out.write(")");
}
&Cfg::Not(ref cfg) => {
out.write("!");
cfg.write_condition(config, out);
}
}
}
}
pub trait CfgWrite {
fn write_before<F: Write>(&self, config: &Config, out: &mut SourceWriter<F>);
fn write_after<F: Write>(&self, config: &Config, out: &mut SourceWriter<F>);
}
impl CfgWrite for Option<Cfg> {
fn write_before<F: Write>(&self, config: &Config, out: &mut SourceWriter<F>) {
if let &Some(ref cfg) = self {
if !cfg.has_defines(config) {
return;
}
out.write("#if ");
cfg.write_condition(config, out);
out.new_line();
}
}
fn write_after<F: Write>(&self, config: &Config, out: &mut SourceWriter<F>) {
if let &Some(ref cfg) = self {
// TODO
if !cfg.has_defines(config) {
return;
}
out.new_line();
out.write("#endif");
}
}
}