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| 1 | +// Copyright 2019-2023 Tauri Programme within The Commons Conservancy |
| 2 | +// SPDX-License-Identifier: Apache-2.0 |
| 3 | +// SPDX-License-Identifier: MIT |
| 4 | + |
| 5 | +use proc_macro2::{Ident, Span, TokenStream}; |
| 6 | +use quote::quote; |
| 7 | +use syn::{ |
| 8 | + parse::{Parse, ParseStream}, |
| 9 | + punctuated::Punctuated, |
| 10 | + Expr, Token, |
| 11 | +}; |
| 12 | + |
| 13 | +pub struct DoMenuItemInput { |
| 14 | + resources_table: Ident, |
| 15 | + rid: Ident, |
| 16 | + kind: Ident, |
| 17 | + var: Ident, |
| 18 | + expr: Expr, |
| 19 | + kinds: Vec<NegatedIdent>, |
| 20 | +} |
| 21 | + |
| 22 | +#[derive(Clone)] |
| 23 | +struct NegatedIdent(bool, Ident); |
| 24 | + |
| 25 | +impl Parse for NegatedIdent { |
| 26 | + fn parse(input: ParseStream) -> syn::Result<Self> { |
| 27 | + let t = input.parse::<Token![!]>(); |
| 28 | + let i: Ident = input.parse()?; |
| 29 | + Ok(NegatedIdent(t.is_ok(), i)) |
| 30 | + } |
| 31 | +} |
| 32 | + |
| 33 | +impl Parse for DoMenuItemInput { |
| 34 | + fn parse(input: ParseStream) -> syn::Result<Self> { |
| 35 | + let resources_table: Ident = input.parse()?; |
| 36 | + let _: Token![,] = input.parse()?; |
| 37 | + let rid: Ident = input.parse()?; |
| 38 | + let _: Token![,] = input.parse()?; |
| 39 | + let kind: Ident = input.parse()?; |
| 40 | + let _: Token![,] = input.parse()?; |
| 41 | + let _: Token![|] = input.parse()?; |
| 42 | + let var: Ident = input.parse()?; |
| 43 | + let _: Token![|] = input.parse()?; |
| 44 | + let expr: Expr = input.parse()?; |
| 45 | + let _: syn::Result<Token![,]> = input.parse(); |
| 46 | + let kinds = Punctuated::<NegatedIdent, Token![|]>::parse_terminated(input)?; |
| 47 | + |
| 48 | + Ok(Self { |
| 49 | + resources_table, |
| 50 | + rid, |
| 51 | + kind, |
| 52 | + var, |
| 53 | + expr, |
| 54 | + kinds: kinds.into_iter().collect(), |
| 55 | + }) |
| 56 | + } |
| 57 | +} |
| 58 | + |
| 59 | +pub fn do_menu_item(input: DoMenuItemInput) -> TokenStream { |
| 60 | + let DoMenuItemInput { |
| 61 | + rid, |
| 62 | + resources_table, |
| 63 | + kind, |
| 64 | + expr, |
| 65 | + var, |
| 66 | + mut kinds, |
| 67 | + } = input; |
| 68 | + |
| 69 | + let defaults = vec![ |
| 70 | + NegatedIdent(false, Ident::new("Submenu", Span::call_site())), |
| 71 | + NegatedIdent(false, Ident::new("MenuItem", Span::call_site())), |
| 72 | + NegatedIdent(false, Ident::new("Predefined", Span::call_site())), |
| 73 | + NegatedIdent(false, Ident::new("Check", Span::call_site())), |
| 74 | + NegatedIdent(false, Ident::new("Icon", Span::call_site())), |
| 75 | + ]; |
| 76 | + |
| 77 | + if kinds.is_empty() { |
| 78 | + kinds.extend(defaults.clone()); |
| 79 | + } |
| 80 | + |
| 81 | + let has_negated = kinds.iter().any(|n| n.0); |
| 82 | + |
| 83 | + if has_negated { |
| 84 | + kinds.extend(defaults); |
| 85 | + kinds.sort_by(|a, b| a.1.cmp(&b.1)); |
| 86 | + kinds.dedup_by(|a, b| a.1 == b.1); |
| 87 | + } |
| 88 | + |
| 89 | + let (kinds, types): (Vec<Ident>, Vec<Ident>) = kinds |
| 90 | + .into_iter() |
| 91 | + .filter_map(|nident| { |
| 92 | + if nident.0 { |
| 93 | + None |
| 94 | + } else { |
| 95 | + match nident.1 { |
| 96 | + i if i == "MenuItem" => Some((i, Ident::new("MenuItem", Span::call_site()))), |
| 97 | + i if i == "Submenu" => Some((i, Ident::new("Submenu", Span::call_site()))), |
| 98 | + i if i == "Predefined" => Some((i, Ident::new("PredefinedMenuItem", Span::call_site()))), |
| 99 | + i if i == "Check" => Some((i, Ident::new("CheckMenuItem", Span::call_site()))), |
| 100 | + i if i == "Icon" => Some((i, Ident::new("IconMenuItem", Span::call_site()))), |
| 101 | + _ => None, |
| 102 | + } |
| 103 | + } |
| 104 | + }) |
| 105 | + .unzip(); |
| 106 | + |
| 107 | + quote! { |
| 108 | + match #kind { |
| 109 | + #( |
| 110 | + ItemKind::#kinds => { |
| 111 | + let #var = #resources_table.get::<#types<R>>(#rid)?; |
| 112 | + #expr |
| 113 | + } |
| 114 | + )* |
| 115 | + _ => unreachable!(), |
| 116 | + } |
| 117 | + } |
| 118 | +} |
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