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use crate::gen::{CfgEvaluator, CfgResult};
use crate::syntax::cfg::CfgExpr;
use crate::syntax::report::Errors;
use crate::syntax::Api;
use quote::quote;
use std::collections::BTreeSet as Set;
use syn::Error;
pub(super) struct UnsupportedCfgEvaluator;
impl CfgEvaluator for UnsupportedCfgEvaluator {
fn eval(&self, name: &str, value: Option<&str>) -> CfgResult {
let _ = name;
let _ = value;
let msg = "cfg attribute is not supported".to_owned();
CfgResult::Undetermined { msg }
}
}
pub(super) fn strip(
cx: &mut Errors,
cfg_errors: &mut Set<String>,
cfg_evaluator: &dyn CfgEvaluator,
apis: &mut Vec<Api>,
) {
apis.retain(|api| eval(cx, cfg_errors, cfg_evaluator, api.cfg()));
for api in apis {
match api {
Api::Struct(strct) => strct
.fields
.retain(|field| eval(cx, cfg_errors, cfg_evaluator, &field.cfg)),
Api::Enum(enm) => enm
.variants
.retain(|variant| eval(cx, cfg_errors, cfg_evaluator, &variant.cfg)),
_ => {}
}
}
}
pub(super) fn eval(
cx: &mut Errors,
cfg_errors: &mut Set<String>,
cfg_evaluator: &dyn CfgEvaluator,
expr: &CfgExpr,
) -> bool {
match try_eval(cfg_evaluator, expr) {
Ok(value) => value,
Err(errors) => {
for error in errors {
if cfg_errors.insert(error.to_string()) {
cx.push(error);
}
}
false
}
}
}
fn try_eval(cfg_evaluator: &dyn CfgEvaluator, expr: &CfgExpr) -> Result<bool, Vec<Error>> {
match expr {
CfgExpr::Unconditional => Ok(true),
CfgExpr::Eq(ident, string) => {
let key = ident.to_string();
let value = string.as_ref().map(|string| string.value());
match cfg_evaluator.eval(&key, value.as_deref()) {
CfgResult::True => Ok(true),
CfgResult::False => Ok(false),
CfgResult::Undetermined { msg } => {
let span = quote!(#ident #string);
Err(vec![Error::new_spanned(span, msg)])
}
}
}
CfgExpr::All(list) => {
let mut all_errors = Vec::new();
for subexpr in list {
match try_eval(cfg_evaluator, subexpr) {
Ok(true) => {}
Ok(false) => return Ok(false),
Err(errors) => all_errors.extend(errors),
}
}
if all_errors.is_empty() {
Ok(true)
} else {
Err(all_errors)
}
}
CfgExpr::Any(list) => {
let mut all_errors = Vec::new();
for subexpr in list {
match try_eval(cfg_evaluator, subexpr) {
Ok(true) => return Ok(true),
Ok(false) => {}
Err(errors) => all_errors.extend(errors),
}
}
if all_errors.is_empty() {
Ok(false)
} else {
Err(all_errors)
}
}
CfgExpr::Not(subexpr) => match try_eval(cfg_evaluator, subexpr) {
Ok(value) => Ok(!value),
Err(errors) => Err(errors),
},
}
}
impl Api {
fn cfg(&self) -> &CfgExpr {
match self {
Api::Include(include) => &include.cfg,
Api::Struct(strct) => &strct.cfg,
Api::Enum(enm) => &enm.cfg,
Api::CxxType(ety) | Api::RustType(ety) => &ety.cfg,
Api::CxxFunction(efn) | Api::RustFunction(efn) => &efn.cfg,
Api::TypeAlias(alias) => &alias.cfg,
Api::Impl(imp) => &imp.cfg,
}
}
}
impl From<bool> for CfgResult {
fn from(value: bool) -> Self {
if value {
CfgResult::True
} else {
CfgResult::False
}
}
}
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