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Extract relevant types out of the metadata's fields.

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This commit is contained in:
Jimmy Cuadra 2018-05-04 20:13:34 -07:00
parent dfaf1c7da1
commit 09e377d68e
1 changed files with 44 additions and 13 deletions
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57
src/api/metadata.rs
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@ -1,14 +1,15 @@
use quote::{ToTokens, Tokens}; use quote::{ToTokens, Tokens};
use syn::punctuated::Pair;
use syn::synom::Synom; use syn::synom::Synom;
use syn::{Expr, ExprStruct, Ident, Member}; use syn::{Expr, ExprStruct, Ident, Lit, Member};
pub struct Metadata { pub struct Metadata {
pub description: Expr, pub description: String,
pub method: Expr, pub method: String,
pub name: Expr, pub name: String,
pub path: Expr, pub path: String,
pub rate_limited: Expr, pub rate_limited: bool,
pub requires_authentication: Expr, pub requires_authentication: bool,
} }
impl From<ExprStruct> for Metadata { impl From<ExprStruct> for Metadata {
@ -24,12 +25,42 @@ impl From<ExprStruct> for Metadata {
let Member::Named(identifier) = field.member; let Member::Named(identifier) = field.member;
match identifier.as_ref() { match identifier.as_ref() {
"description" => description = Some(field.expr), "description" => {
"method" => method = Some(field.expr), let Expr::Lit(expr_lit) = field.expr;
"name" => name = Some(field.expr), let Lit::Str(lit_str) = expr_lit.lit;
"path" => path = Some(field.expr), description = Some(lit_str.value());
"rate_limited" => rate_limited = Some(field.expr), }
"requires_authentication" => requires_authentication = Some(field.expr), "method" => {
let Expr::Path(expr_path) = field.expr;
let path = expr_path.path;
let segments = path.segments;
if segments.len() != 1 {
panic!("ruma_api! expects a one component path for `metadata` `method`");
}
let pair = segments.first().unwrap(); // safe because we just checked
let Pair::End(method_name) = pair;
method = Some(method_name.ident.to_string());
}
"name" => {
let Expr::Lit(expr_lit) = field.expr;
let Lit::Str(lit_str) = expr_lit.lit;
name = Some(lit_str.value());
}
"path" => {
let Expr::Lit(expr_lit) = field.expr;
let Lit::Str(lit_str) = expr_lit.lit;
path = Some(lit_str.value());
}
"rate_limited" => {
let Expr::Lit(expr_lit) = field.expr;
let Lit::Bool(lit_bool) = expr_lit.lit;
rate_limited = Some(lit_bool.value)
}
"requires_authentication" => {
let Expr::Lit(expr_lit) = field.expr;
let Lit::Bool(lit_bool) = expr_lit.lit;
requires_authentication = Some(lit_bool.value)
}
_ => panic!("ruma_api! metadata included unexpected field"), _ => panic!("ruma_api! metadata included unexpected field"),
} }
} }