17032997319

Committed 18 Aug 2025 06:35AM UTC coverage: 26.78% (-1.0%) from 27.748%

Build # 17032997319

Build Type

Pull #533

github

Committed by

web-flow

Commit Message

Merge c0dcacdd2 into 95bebee0d

Pull Request Pull Request #533: Feat/interface impl

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0.0

/crates/macros/src/function.rs

use std::collections::HashMap;

use darling::{FromAttributes, ToTokens};
use proc_macro2::{Ident, Span, TokenStream};
use quote::{format_ident, quote};
use syn::spanned::Spanned as _;
use syn::{Expr, FnArg, GenericArgument, ItemFn, PatType, PathArguments, Type, TypePath};

use crate::helpers::get_docs;
use crate::parsing::{PhpRename, RenameRule, Visibility};
use crate::prelude::*;
use crate::syn_ext::DropLifetimes;

pub fn wrap(input: &syn::Path) -> Result<TokenStream> {
    let Some(func_name) = input.get_ident() else {
        bail!(input => "Pass a PHP function name into `wrap_function!()`.");
    };
    let builder_func = format_ident!("_internal_{func_name}");

    Ok(quote! {{
        (<#builder_func as ::ext_php_rs::internal::function::PhpFunction>::FUNCTION_ENTRY)()
    }})
}

#[derive(FromAttributes, Default, Debug)]
#[darling(default, attributes(php), forward_attrs(doc))]
struct PhpFunctionAttribute {
    #[darling(flatten)]
    rename: PhpRename,
    defaults: HashMap<Ident, Expr>,
    optional: Option<Ident>,
    vis: Option<Visibility>,
    attrs: Vec<syn::Attribute>,
}

pub fn parser(mut input: ItemFn) -> Result<TokenStream> {
    let php_attr = PhpFunctionAttribute::from_attributes(&input.attrs)?;
    input.attrs.retain(|attr| !attr.path().is_ident("php"));

    let args = Args::parse_from_fnargs(input.sig.inputs.iter(), php_attr.defaults)?;
    if let Some(ReceiverArg { span, .. }) = args.receiver {
        bail!(span => "Receiver arguments are invalid on PHP functions. See `#[php_impl]`.");
    }

    let docs = get_docs(&php_attr.attrs)?;

    let func = Function::new(
        &input.sig,
        php_attr
            .rename
            .rename(input.sig.ident.to_string(), RenameRule::Snake),
        args,
        php_attr.optional,
        docs,
    );
    let function_impl = func.php_function_impl();

    Ok(quote! {
        #input
        #function_impl
    })
}

#[derive(Debug)]
pub struct Function<'a> {
    /// Identifier of the Rust function associated with the function.
    pub ident: &'a Ident,
    /// Name of the function in PHP.
    pub name: String,
    /// Function arguments.
    pub args: Args<'a>,
    /// Function outputs.
    pub output: Option<&'a Type>,
    /// The first optional argument of the function.
    pub optional: Option<Ident>,
    /// Doc comments for the function.
    pub docs: Vec<String>,
}

#[derive(Debug)]
pub enum CallType<'a> {
    Function,
    Method {
        class: &'a syn::Path,
        receiver: MethodReceiver,
    },
}

/// Type of receiver on the method.
#[derive(Debug)]
pub enum MethodReceiver {
    /// Static method - has no receiver.
    Static,
    /// Class method, takes `&self` or `&mut self`.
    Class,
    /// Class method, takes `&mut ZendClassObject<Self>`.
    ZendClassObject,
}

impl<'a> Function<'a> {
    /// Parse a function.
    ///
    /// # Parameters
    ///
    /// * `sig` - Function signature.
    /// * `name` - Function name in PHP land.
    /// * `args` - Function arguments.
    /// * `optional` - The ident of the first optional argument.
    pub fn new(
        sig: &'a syn::Signature,
        name: String,
        args: Args<'a>,
        optional: Option<Ident>,
        docs: Vec<String>,
    ) -> Self {
        Self {
            ident: &sig.ident,
            name,
            args,
            output: match &sig.output {
                syn::ReturnType::Default => None,
                syn::ReturnType::Type(_, ty) => Some(&**ty),
            },
            optional,
            docs,
        }
    }

    /// Generates an internal identifier for the function.
    pub fn internal_ident(&self) -> Ident {
        format_ident!("_internal_{}", &self.ident)
    }

    pub fn abstract_function_builder(&self) -> TokenStream {
        let name = &self.name;
        let (required, not_required) = self.args.split_args(self.optional.as_ref());

        // `entry` impl
        let required_args = required
            .iter()
            .map(TypedArg::arg_builder)
            .collect::<Vec<_>>();
        let not_required_args = not_required
            .iter()
            .map(TypedArg::arg_builder)
            .collect::<Vec<_>>();

        let returns = self.build_returns();
        let docs = if self.docs.is_empty() {
            quote! {}
        } else {
            let docs = &self.docs;
            quote! {
                .docs(&[#(#docs),*])
            }
        };

        quote! {
            ::ext_php_rs::builders::FunctionBuilder::new_abstract(#name)
            #(.arg(#required_args))*
            .not_required()
            #(.arg(#not_required_args))*
            #returns
            #docs
        }
    }

    /// Generates the function builder for the function.
    pub fn function_builder(&self, call_type: CallType) -> TokenStream {
        let name = &self.name;
        let (required, not_required) = self.args.split_args(self.optional.as_ref());

        // `handler` impl
        let arg_declarations = self
            .args
            .typed
            .iter()
            .map(TypedArg::arg_declaration)
            .collect::<Vec<_>>();

        // `entry` impl
        let required_args = required
            .iter()
            .map(TypedArg::arg_builder)
            .collect::<Vec<_>>();
        let not_required_args = not_required
            .iter()
            .map(TypedArg::arg_builder)
            .collect::<Vec<_>>();

        let returns = self.build_returns();
        let result = self.build_result(call_type, required, not_required);
        let docs = if self.docs.is_empty() {
            quote! {}
        } else {
            let docs = &self.docs;
            quote! {
                .docs(&[#(#docs),*])
            }
        };

        quote! {
            ::ext_php_rs::builders::FunctionBuilder::new(#name, {
                ::ext_php_rs::zend_fastcall! {
                    extern fn handler(
                        ex: &mut ::ext_php_rs::zend::ExecuteData,
                        retval: &mut ::ext_php_rs::types::Zval,
                    ) {
                        use ::ext_php_rs::convert::IntoZval;

                        #(#arg_declarations)*
                        let result = {
                            #result
                        };

                        if let Err(e) = result.set_zval(retval, false) {
                            let e: ::ext_php_rs::exception::PhpException = e.into();
                            e.throw().expect("Failed to throw PHP exception.");
                        }
                    }
                }
                handler
            })
            #(.arg(#required_args))*
            .not_required()
            #(.arg(#not_required_args))*
            #returns
            #docs
        }
    }

    fn build_returns(&self) -> Option<TokenStream> {
        self.output.cloned().map(|mut output| {
            output.drop_lifetimes();
            quote! {
                .returns(
                    <#output as ::ext_php_rs::convert::IntoZval>::TYPE,
                    false,
                    <#output as ::ext_php_rs::convert::IntoZval>::NULLABLE,
                )
            }
        })
    }

    fn build_result(
        &self,
        call_type: CallType,
        required: &[TypedArg<'_>],
        not_required: &[TypedArg<'_>],
    ) -> TokenStream {
        let ident = self.ident;
        let required_arg_names: Vec<_> = required.iter().map(|arg| arg.name).collect();
        let not_required_arg_names: Vec<_> = not_required.iter().map(|arg| arg.name).collect();

        let arg_accessors = self.args.typed.iter().map(|arg| {
            arg.accessor(|e| {
                quote! {
                    #e.throw().expect("Failed to throw PHP exception.");
                    return;
                }
            })
        });

        match call_type {
            CallType::Function => quote! {
                let parse = ex.parser()
                    #(.arg(&mut #required_arg_names))*
                    .not_required()
                    #(.arg(&mut #not_required_arg_names))*
                    .parse();
                if parse.is_err() {
                    return;
                }

                #ident(#({#arg_accessors}),*)
            },
            CallType::Method { class, receiver } => {
                let this = match receiver {
                    MethodReceiver::Static => quote! {
                        let parse = ex.parser();
                    },
                    MethodReceiver::ZendClassObject | MethodReceiver::Class => quote! {
                        let (parse, this) = ex.parser_method::<#class>();
                        let this = match this {
                            Some(this) => this,
                            None => {
                                ::ext_php_rs::exception::PhpException::default("Failed to retrieve reference to `$this`".into())
                                    .throw()
                                    .unwrap();
                                return;
                            }
                        };
                    },
                };
                let call = match receiver {
                    MethodReceiver::Static => {
                        quote! { #class::#ident(#({#arg_accessors}),*) }
                    }
                    MethodReceiver::Class => quote! { this.#ident(#({#arg_accessors}),*) },
                    MethodReceiver::ZendClassObject => {
                        quote! { #class::#ident(this, #({#arg_accessors}),*) }
                    }
                };
                quote! {
                    #this
                    let parse_result = parse
                        #(.arg(&mut #required_arg_names))*
                        .not_required()
                        #(.arg(&mut #not_required_arg_names))*
                        .parse();
                    if parse_result.is_err() {
                        return;
                    }

                    #call
                }
            }
        }
    }

    /// Generates a struct and impl for the `PhpFunction` trait.
    pub fn php_function_impl(&self) -> TokenStream {
        let internal_ident = self.internal_ident();
        let builder = self.function_builder(CallType::Function);

        quote! {
            #[doc(hidden)]
            #[allow(non_camel_case_types)]
            struct #internal_ident;

            impl ::ext_php_rs::internal::function::PhpFunction for #internal_ident {
                const FUNCTION_ENTRY: fn() -> ::ext_php_rs::builders::FunctionBuilder<'static> = {
                    fn entry() -> ::ext_php_rs::builders::FunctionBuilder<'static>
                    {
                        #builder
                    }
                    entry
                };
            }
        }
    }

    /// Returns a constructor metadata object for this function. This doesn't
    /// check if the function is a constructor, however.
    pub fn constructor_meta(
        &self,
        class: &syn::Path,
        visibility: Option<&Visibility>,
    ) -> TokenStream {
        let ident = self.ident;
        let (required, not_required) = self.args.split_args(self.optional.as_ref());
        let required_args = required
            .iter()
            .map(TypedArg::arg_builder)
            .collect::<Vec<_>>();
        let not_required_args = not_required
            .iter()
            .map(TypedArg::arg_builder)
            .collect::<Vec<_>>();

        let required_arg_names: Vec<_> = required.iter().map(|arg| arg.name).collect();
        let not_required_arg_names: Vec<_> = not_required.iter().map(|arg| arg.name).collect();
        let arg_declarations = self
            .args
            .typed
            .iter()
            .map(TypedArg::arg_declaration)
            .collect::<Vec<_>>();
        let arg_accessors = self.args.typed.iter().map(|arg| {
            arg.accessor(
                |e| quote! { return ::ext_php_rs::class::ConstructorResult::Exception(#e); },
            )
        });
        let variadic = self.args.typed.iter().any(|arg| arg.variadic).then(|| {
            quote! {
                .variadic()
            }
        });
        let docs = &self.docs;
        let flags = visibility.option_tokens();

        quote! {
            ::ext_php_rs::class::ConstructorMeta {
                constructor: {
                    fn inner(ex: &mut ::ext_php_rs::zend::ExecuteData) -> ::ext_php_rs::class::ConstructorResult<#class> {
                        #(#arg_declarations)*
                        let parse = ex.parser()
                            #(.arg(&mut #required_arg_names))*
                            .not_required()
                            #(.arg(&mut #not_required_arg_names))*
                            #variadic
                            .parse();
                        if parse.is_err() {
                            return ::ext_php_rs::class::ConstructorResult::ArgError;
                        }
                        #class::#ident(#({#arg_accessors}),*).into()
                    }
                    inner
                },
                build_fn: {
                    fn inner(func: ::ext_php_rs::builders::FunctionBuilder) -> ::ext_php_rs::builders::FunctionBuilder {
                        func
                            .docs(&[#(#docs),*])
                            #(.arg(#required_args))*
                            .not_required()
                            #(.arg(#not_required_args))*
                            #variadic
                    }
                    inner
                },
                flags: #flags
            }
        }
    }
}

#[derive(Debug)]
pub struct ReceiverArg {
    pub _mutable: bool,
    pub span: Span,
}

#[derive(Debug)]
pub struct TypedArg<'a> {
    pub name: &'a Ident,
    pub ty: Type,
    pub nullable: bool,
    pub default: Option<Expr>,
    pub as_ref: bool,
    pub variadic: bool,
}

#[derive(Debug)]
pub struct Args<'a> {
    pub receiver: Option<ReceiverArg>,
    pub typed: Vec<TypedArg<'a>>,
}

impl<'a> Args<'a> {
    pub fn parse_from_fnargs(
        args: impl Iterator<Item = &'a FnArg>,
        mut defaults: HashMap<Ident, Expr>,
    ) -> Result<Self> {
        let mut result = Self {
            receiver: None,
            typed: vec![],
        };
        for arg in args {
            match arg {
                FnArg::Receiver(receiver) => {
                    if receiver.reference.is_none() {
                        bail!(receiver => "PHP objects are heap-allocated and cannot be passed by value. Try using `&self` or `&mut self`.");
                    } else if result.receiver.is_some() {
                        bail!(receiver => "Too many receivers specified.")
                    }
                    result.receiver.replace(ReceiverArg {
                        _mutable: receiver.mutability.is_some(),
                        span: receiver.span(),
                    });
                }
                FnArg::Typed(PatType { pat, ty, .. }) => {
                    let syn::Pat::Ident(syn::PatIdent { ident, .. }) = &**pat else {
                        bail!(pat => "Unsupported argument.");
                    };

                    // If the variable is `&[&Zval]` treat it as the variadic argument.
                    let default = defaults.remove(ident);
                    let nullable = type_is_nullable(ty.as_ref(), default.is_some())?;
                    let (variadic, as_ref, ty) = Self::parse_typed(ty);
                    result.typed.push(TypedArg {
                        name: ident,
                        ty,
                        nullable,
                        default,
                        as_ref,
                        variadic,
                    });
                }
            }
        }
        Ok(result)
    }

    fn parse_typed(ty: &Type) -> (bool, bool, Type) {
        match ty {
            Type::Reference(ref_) => {
                let as_ref = ref_.mutability.is_some();
                match ref_.elem.as_ref() {
                    Type::Slice(slice) => (
                        // TODO: Allow specifying the variadic type.
                        slice.elem.to_token_stream().to_string() == "& Zval",
                        as_ref,
                        ty.clone(),
                    ),
                    _ => (false, as_ref, ty.clone()),
                }
            }
            Type::Path(TypePath { path, .. }) => {
                let mut as_ref = false;

                // For for types that are `Option<&mut T>` to turn them into
                // `Option<&T>`, marking the Arg as as "passed by reference".
                let ty = path
                    .segments
                    .last()
                    .filter(|seg| seg.ident == "Option")
                    .and_then(|seg| {
                        if let PathArguments::AngleBracketed(args) = &seg.arguments {
                            args.args
                                .iter()
                                .find(|arg| matches!(arg, GenericArgument::Type(_)))
                                .and_then(|ga| match ga {
                                    GenericArgument::Type(ty) => Some(match ty {
                                        Type::Reference(r) => {
                                            let mut new_ref = r.clone();
                                            new_ref.mutability = None;
                                            as_ref = true;
                                            Type::Reference(new_ref)
                                        }
                                        _ => ty.clone(),
                                    }),
                                    _ => None,
                                })
                        } else {
                            None
                        }
                    })
                    .unwrap_or_else(|| ty.clone());
                (false, as_ref, ty.clone())
            }
            _ => (false, false, ty.clone()),
        }
    }

    /// Splits the typed arguments into two slices:
    ///
    /// 1. Required arguments.
    /// 2. Non-required arguments.
    ///
    /// # Parameters
    ///
    /// * `optional` - The first optional argument. If [`None`], the optional
    ///   arguments will be from the first nullable argument after the last
    ///   non-nullable argument to the end of the arguments.
    pub fn split_args(&self, optional: Option<&Ident>) -> (&[TypedArg<'a>], &[TypedArg<'a>]) {
        let mut mid = None;
        for (i, arg) in self.typed.iter().enumerate() {
            if let Some(optional) = optional {
                if optional == arg.name {
                    mid.replace(i);
                }
            } else if mid.is_none() && arg.nullable {
                mid.replace(i);
            } else if !arg.nullable {
                mid.take();
            }
        }
        match mid {
            Some(mid) => (&self.typed[..mid], &self.typed[mid..]),
            None => (&self.typed[..], &self.typed[0..0]),
        }
    }
}

impl TypedArg<'_> {
    /// Returns a 'clean type' with the lifetimes removed. This allows the type
    /// to be used outside of the original function context.
    fn clean_ty(&self) -> Type {
        let mut ty = self.ty.clone();
        ty.drop_lifetimes();

        // Variadic arguments are passed as slices, so we need to extract the
        // inner type.
        if self.variadic {
            let Type::Reference(reference) = &ty else {
                return ty;
            };

            if let Type::Slice(inner) = &*reference.elem {
                return *inner.elem.clone();
            }
        }

        ty
    }

    /// Returns a token stream containing an argument declaration, where the
    /// name of the variable holding the arg is the name of the argument.
    fn arg_declaration(&self) -> TokenStream {
        let name = self.name;
        let val = self.arg_builder();
        quote! {
            let mut #name = #val;
        }
    }

    /// Returns a token stream containing the `Arg` definition to be passed to
    /// `ext-php-rs`.
    fn arg_builder(&self) -> TokenStream {
        let name = self.name.to_string();
        let ty = self.clean_ty();
        let null = if self.nullable {
            Some(quote! { .allow_null() })
        } else {
            None
        };
        let default = self.default.as_ref().map(|val| {
            let val = val.to_token_stream().to_string();
            quote! {
                .default(#val)
            }
        });
        let as_ref = if self.as_ref {
            Some(quote! { .as_ref() })
        } else {
            None
        };
        let variadic = self.variadic.then(|| quote! { .is_variadic() });
        quote! {
            ::ext_php_rs::args::Arg::new(#name, <#ty as ::ext_php_rs::convert::FromZvalMut>::TYPE)
                #null
                #default
                #as_ref
                #variadic
        }
    }

    /// Get the accessor used to access the value of the argument.
    fn accessor(&self, bail_fn: impl Fn(TokenStream) -> TokenStream) -> TokenStream {
        let name = self.name;
        if let Some(default) = &self.default {
            quote! {
                #name.val().unwrap_or(#default.into())
            }
        } else if self.variadic {
            quote! {
                &#name.variadic_vals()
            }
        } else if self.nullable {
            // Originally I thought we could just use the below case for `null` options, as
            // `val()` will return `Option<Option<T>>`, however, this isn't the case when
            // the argument isn't given, as the underlying zval is null.
            quote! {
                #name.val()
            }
        } else {
            let bail = bail_fn(quote! {
                ::ext_php_rs::exception::PhpException::default(
                    concat!("Invalid value given for argument `", stringify!(#name), "`.").into()
                )
            });
            quote! {
                match #name.val() {
                    Some(val) => val,
                    None => {
                        #bail;
                    }
                }
            }
        }
    }
}

/// Returns true of the given type is nullable in PHP.
// TODO(david): Eventually move to compile-time constants for this (similar to
// FromZval::NULLABLE).
pub fn type_is_nullable(ty: &Type, has_default: bool) -> Result<bool> {
    Ok(match ty {
        syn::Type::Path(path) => {
            has_default
                || path
                    .path
                    .segments
                    .iter()
                    .next_back()
                    .is_some_and(|seg| seg.ident == "Option")
        }
        syn::Type::Reference(_) => false, /* Reference cannot be nullable unless */
        // wrapped in `Option` (in that case it'd be a Path).
        _ => bail!(ty => "Unsupported argument type."),
    })
}

1	use std::collections::HashMap;
2
3	use darling::{FromAttributes, ToTokens};
4	use proc_macro2::{Ident, Span, TokenStream};
5	use quote::{format_ident, quote};
6	use syn::spanned::Spanned as _;
7	use syn::{Expr, FnArg, GenericArgument, ItemFn, PatType, PathArguments, Type, TypePath};
8
9	use crate::helpers::get_docs;
10	use crate::parsing::{PhpRename, RenameRule, Visibility};
11	use crate::prelude::*;
12	use crate::syn_ext::DropLifetimes;
13
14	pub fn wrap(input: &syn::Path) -> Result<TokenStream> {	×
15	let Some(func_name) = input.get_ident() else {	×
16	bail!(input => "Pass a PHP function name into `wrap_function!()`.");	×
17	};
18	let builder_func = format_ident!("_internal_{func_name}");
19
20	Ok(quote! {{
21	(<#builder_func as ::ext_php_rs::internal::function::PhpFunction>::FUNCTION_ENTRY)()
22	}})
23	}
24
25	#[derive(FromAttributes, Default, Debug)]
26	#[darling(default, attributes(php), forward_attrs(doc))]
27	struct PhpFunctionAttribute {
28	#[darling(flatten)]
29	rename: PhpRename,
30	defaults: HashMap<Ident, Expr>,
31	optional: Option<Ident>,
32	vis: Option<Visibility>,
33	attrs: Vec<syn::Attribute>,
34	}
35
36	pub fn parser(mut input: ItemFn) -> Result<TokenStream> {	×
37	let php_attr = PhpFunctionAttribute::from_attributes(&input.attrs)?;	×
38	input.attrs.retain(\|attr\| !attr.path().is_ident("php"));	×
39
40	let args = Args::parse_from_fnargs(input.sig.inputs.iter(), php_attr.defaults)?;	×
41	if let Some(ReceiverArg { span, .. }) = args.receiver {	×
42	bail!(span => "Receiver arguments are invalid on PHP functions. See `#[php_impl]`.");
43	}
44
45	let docs = get_docs(&php_attr.attrs)?;	×
46
47	let func = Function::new(
48	&input.sig,
49	php_attr
50	.rename
51	.rename(input.sig.ident.to_string(), RenameRule::Snake),
52	args,
53	php_attr.optional,
54	docs,
55	);
56	let function_impl = func.php_function_impl();
57
58	Ok(quote! {
59	#input
60	#function_impl
61	})
62	}
63
64	#[derive(Debug)]
65	pub struct Function<'a> {
66	/// Identifier of the Rust function associated with the function.
67	pub ident: &'a Ident,
68	/// Name of the function in PHP.
69	pub name: String,
70	/// Function arguments.
71	pub args: Args<'a>,
72	/// Function outputs.
73	pub output: Option<&'a Type>,
74	/// The first optional argument of the function.
75	pub optional: Option<Ident>,
76	/// Doc comments for the function.
77	pub docs: Vec<String>,
78	}
79
80	#[derive(Debug)]
81	pub enum CallType<'a> {
82	Function,
83	Method {
84	class: &'a syn::Path,
85	receiver: MethodReceiver,
86	},
87	}
88
89	/// Type of receiver on the method.
90	#[derive(Debug)]
91	pub enum MethodReceiver {
92	/// Static method - has no receiver.
93	Static,
94	/// Class method, takes `&self` or `&mut self`.
95	Class,
96	/// Class method, takes `&mut ZendClassObject<Self>`.
97	ZendClassObject,
98	}
99
100	impl<'a> Function<'a> {
101	/// Parse a function.
102	///
103	/// # Parameters
104	///
105	/// * `sig` - Function signature.
106	/// * `name` - Function name in PHP land.
107	/// * `args` - Function arguments.
108	/// * `optional` - The ident of the first optional argument.
109	pub fn new(	×
110	sig: &'a syn::Signature,
111	name: String,
112	args: Args<'a>,
113	optional: Option<Ident>,
114	docs: Vec<String>,
115	) -> Self {
116	Self {
117	ident: &sig.ident,	×
118	name,
119	args,
120	output: match &sig.output {	×
121	syn::ReturnType::Default => None,
122	syn::ReturnType::Type(_, ty) => Some(&**ty),
123	},
124	optional,
125	docs,
126	}
127	}
128
129	/// Generates an internal identifier for the function.
130	pub fn internal_ident(&self) -> Ident {	×
131	format_ident!("_internal_{}", &self.ident)	×
132	}
133
NEW 134	pub fn abstract_function_builder(&self) -> TokenStream {	×
NEW 135	let name = &self.name;	×
NEW 136	let (required, not_required) = self.args.split_args(self.optional.as_ref());	×
137
138	// `entry` impl
NEW 139	let required_args = required	×
140	.iter()
NEW 141	.map(TypedArg::arg_builder)	×
142	.collect::<Vec<_>>();
NEW 143	let not_required_args = not_required	×
144	.iter()
NEW 145	.map(TypedArg::arg_builder)	×
146	.collect::<Vec<_>>();
147
NEW 148	let returns = self.build_returns();	×
NEW 149	let docs = if self.docs.is_empty() {	×
NEW 150	quote! {}	×
151	} else {
NEW 152	let docs = &self.docs;	×
NEW 153	quote! {	×
NEW 154	.docs(&[#(#docs),*])	×
155	}
156	};
157
NEW 158	quote! {	×
NEW 159	::ext_php_rs::builders::FunctionBuilder::new_abstract(#name)	×
NEW 160	#(.arg(#required_args))*	×
NEW 161	.not_required()	×
NEW 162	#(.arg(#not_required_args))*	×
NEW 163	#returns	×
NEW 164	#docs	×
165	}
166	}
167
168	/// Generates the function builder for the function.
169	pub fn function_builder(&self, call_type: CallType) -> TokenStream {	×
170	let name = &self.name;	×
171	let (required, not_required) = self.args.split_args(self.optional.as_ref());	×
172
173	// `handler` impl
174	let arg_declarations = self	×
175	.args	×
176	.typed	×
177	.iter()
178	.map(TypedArg::arg_declaration)	×
179	.collect::<Vec<_>>();
180
181	// `entry` impl
182	let required_args = required	×
183	.iter()
184	.map(TypedArg::arg_builder)	×
185	.collect::<Vec<_>>();
186	let not_required_args = not_required	×
187	.iter()
188	.map(TypedArg::arg_builder)	×
189	.collect::<Vec<_>>();
190
191	let returns = self.build_returns();	×
192	let result = self.build_result(call_type, required, not_required);	×
193	let docs = if self.docs.is_empty() {	×
194	quote! {}	×
195	} else {
196	let docs = &self.docs;	×
197	quote! {	×
198	.docs(&[#(#docs),*])	×
199	}
200	};
201
202	quote! {	×
203	::ext_php_rs::builders::FunctionBuilder::new(#name, {	×
204	::ext_php_rs::zend_fastcall! {	×
205	extern fn handler(	×
206	ex: &mut ::ext_php_rs::zend::ExecuteData,	×
207	retval: &mut ::ext_php_rs::types::Zval,	×
208	) {
209	use ::ext_php_rs::convert::IntoZval;	×
210
211	#(#arg_declarations)*	×
212	let result = {	×
213	#result	×
214	};
215
216	if let Err(e) = result.set_zval(retval, false) {	×
217	let e: ::ext_php_rs::exception::PhpException = e.into();	×
218	e.throw().expect("Failed to throw PHP exception.");	×
219	}
220	}
221	}
222	handler	×
223	})
224	#(.arg(#required_args))*	×
225	.not_required()	×
226	#(.arg(#not_required_args))*	×
227	#returns	×
228	#docs	×
229	}
230	}
231
232	fn build_returns(&self) -> Option<TokenStream> {	×
233	self.output.cloned().map(\|mut output\| {	×
234	output.drop_lifetimes();	×
235	quote! {	×
236	.returns(	×
237	<#output as ::ext_php_rs::convert::IntoZval>::TYPE,	×
238	false,	×
239	<#output as ::ext_php_rs::convert::IntoZval>::NULLABLE,	×
240	)
241	}
242	})
243	}
244
245	fn build_result(	×
246	&self,
247	call_type: CallType,
248	required: &[TypedArg<'_>],
249	not_required: &[TypedArg<'_>],
250	) -> TokenStream {
251	let ident = self.ident;	×
252	let required_arg_names: Vec<_> = required.iter().map(\|arg\| arg.name).collect();	×
253	let not_required_arg_names: Vec<_> = not_required.iter().map(\|arg\| arg.name).collect();	×
254
255	let arg_accessors = self.args.typed.iter().map(\|arg\| {	×
256	arg.accessor(\|e\| {	×
257	quote! {	×
258	#e.throw().expect("Failed to throw PHP exception.");	×
259	return;	×
260	}
261	})
262	});
263
264	match call_type {	×
265	CallType::Function => quote! {	×
266	let parse = ex.parser()	×
267	#(.arg(&mut #required_arg_names))*	×
268	.not_required()	×
269	#(.arg(&mut #not_required_arg_names))*	×
270	.parse();	×
271	if parse.is_err() {	×
272	return;	×
273	}
274
275	#ident(#({#arg_accessors}),*)	×
276	},
277	CallType::Method { class, receiver } => {	×
278	let this = match receiver {	×
279	MethodReceiver::Static => quote! {	×
280	let parse = ex.parser();	×
281	},
282	MethodReceiver::ZendClassObject \| MethodReceiver::Class => quote! {	×
283	let (parse, this) = ex.parser_method::<#class>();	×
284	let this = match this {	×
285	Some(this) => this,	×
286	None => {	×
287	::ext_php_rs::exception::PhpException::default("Failed to retrieve reference to `$this`".into())	×
288	.throw()	×
289	.unwrap();	×
290	return;	×
291	}
292	};
293	},
294	};
295	let call = match receiver {	×
296	MethodReceiver::Static => {	×
297	quote! { #class::#ident(#({#arg_accessors}),*) }	×
298	}
299	MethodReceiver::Class => quote! { this.#ident(#({#arg_accessors}),*) },	×
300	MethodReceiver::ZendClassObject => {	×
301	quote! { #class::#ident(this, #({#arg_accessors}),*) }	×
302	}
303	};
304	quote! {	×
305	#this	×
306	let parse_result = parse	×
307	#(.arg(&mut #required_arg_names))*	×
308	.not_required()	×
309	#(.arg(&mut #not_required_arg_names))*	×
310	.parse();	×
311	if parse_result.is_err() {	×
312	return;	×
313	}
314
315	#call	×
316	}
317	}
318	}
319	}
320
321	/// Generates a struct and impl for the `PhpFunction` trait.
322	pub fn php_function_impl(&self) -> TokenStream {	×
323	let internal_ident = self.internal_ident();	×
324	let builder = self.function_builder(CallType::Function);	×
325
326	quote! {	×
327	#[doc(hidden)]	×
328	#[allow(non_camel_case_types)]	×
329	struct #internal_ident;	×
330
331	impl ::ext_php_rs::internal::function::PhpFunction for #internal_ident {	×
332	const FUNCTION_ENTRY: fn() -> ::ext_php_rs::builders::FunctionBuilder<'static> = {	×
333	fn entry() -> ::ext_php_rs::builders::FunctionBuilder<'static>	×
334	{
335	#builder	×
336	}
337	entry	×
338	};
339	}
340	}
341	}
342
343	/// Returns a constructor metadata object for this function. This doesn't
344	/// check if the function is a constructor, however.
345	pub fn constructor_meta(	×
346	&self,
347	class: &syn::Path,
348	visibility: Option<&Visibility>,
349	) -> TokenStream {
350	let ident = self.ident;	×
351	let (required, not_required) = self.args.split_args(self.optional.as_ref());	×
352	let required_args = required	×
353	.iter()
354	.map(TypedArg::arg_builder)	×
355	.collect::<Vec<_>>();
356	let not_required_args = not_required	×
357	.iter()
358	.map(TypedArg::arg_builder)	×
359	.collect::<Vec<_>>();
360
361	let required_arg_names: Vec<_> = required.iter().map(\|arg\| arg.name).collect();	×
362	let not_required_arg_names: Vec<_> = not_required.iter().map(\|arg\| arg.name).collect();	×
363	let arg_declarations = self	×
364	.args	×
365	.typed	×
366	.iter()
367	.map(TypedArg::arg_declaration)	×
368	.collect::<Vec<_>>();
369	let arg_accessors = self.args.typed.iter().map(\|arg\| {	×
370	arg.accessor(	×
371	\|e\| quote! { return ::ext_php_rs::class::ConstructorResult::Exception(#e); },	×
372	)
373	});
374	let variadic = self.args.typed.iter().any(\|arg\| arg.variadic).then(\|\| {	×
375	quote! {	×
376	.variadic()	×
377	}
378	});
379	let docs = &self.docs;	×
380	let flags = visibility.option_tokens();	×
381
382	quote! {	×
383	::ext_php_rs::class::ConstructorMeta {	×
384	constructor: {	×
385	fn inner(ex: &mut ::ext_php_rs::zend::ExecuteData) -> ::ext_php_rs::class::ConstructorResult<#class> {	×
386	#(#arg_declarations)*	×
387	let parse = ex.parser()	×
388	#(.arg(&mut #required_arg_names))*	×
389	.not_required()	×
390	#(.arg(&mut #not_required_arg_names))*	×
391	#variadic	×
392	.parse();	×
393	if parse.is_err() {	×
394	return ::ext_php_rs::class::ConstructorResult::ArgError;	×
395	}
396	#class::#ident(#({#arg_accessors}),*).into()	×
397	}
398	inner	×
399	},
400	build_fn: {	×
401	fn inner(func: ::ext_php_rs::builders::FunctionBuilder) -> ::ext_php_rs::builders::FunctionBuilder {	×
402	func	×
403	.docs(&[#(#docs),*])	×
404	#(.arg(#required_args))*	×
405	.not_required()	×
406	#(.arg(#not_required_args))*	×
407	#variadic	×
408	}
409	inner	×
410	},
411	flags: #flags	×
412	}
413	}
414	}
415	}
416
417	#[derive(Debug)]
418	pub struct ReceiverArg {
419	pub _mutable: bool,
420	pub span: Span,
421	}
422
423	#[derive(Debug)]
424	pub struct TypedArg<'a> {
425	pub name: &'a Ident,
426	pub ty: Type,
427	pub nullable: bool,
428	pub default: Option<Expr>,
429	pub as_ref: bool,
430	pub variadic: bool,
431	}
432
433	#[derive(Debug)]
434	pub struct Args<'a> {
435	pub receiver: Option<ReceiverArg>,
436	pub typed: Vec<TypedArg<'a>>,
437	}
438
439	impl<'a> Args<'a> {
440	pub fn parse_from_fnargs(	×
441	args: impl Iterator<Item = &'a FnArg>,
442	mut defaults: HashMap<Ident, Expr>,
443	) -> Result<Self> {
444	let mut result = Self {
445	receiver: None,
446	typed: vec![],	×
447	};
448	for arg in args {	×
449	match arg {	×
450	FnArg::Receiver(receiver) => {	×
451	if receiver.reference.is_none() {	×
452	bail!(receiver => "PHP objects are heap-allocated and cannot be passed by value. Try using `&self` or `&mut self`.");	×
453	} else if result.receiver.is_some() {	×
454	bail!(receiver => "Too many receivers specified.")	×
455	}
456	result.receiver.replace(ReceiverArg {	×
457	_mutable: receiver.mutability.is_some(),	×
458	span: receiver.span(),	×
459	});
460	}
461	FnArg::Typed(PatType { pat, ty, .. }) => {	×
462	let syn::Pat::Ident(syn::PatIdent { ident, .. }) = &**pat else {	×
463	bail!(pat => "Unsupported argument.");	×
464	};
465
466	// If the variable is `&[&Zval]` treat it as the variadic argument.
467	let default = defaults.remove(ident);	×
468	let nullable = type_is_nullable(ty.as_ref(), default.is_some())?;	×
469	let (variadic, as_ref, ty) = Self::parse_typed(ty);	×
470	result.typed.push(TypedArg {	×
471	name: ident,	×
472	ty,	×
473	nullable,	×
474	default,	×
475	as_ref,	×
476	variadic,	×
477	});
478	}
479	}
480	}
481	Ok(result)	×
482	}
483
484	fn parse_typed(ty: &Type) -> (bool, bool, Type) {	×
485	match ty {	×
486	Type::Reference(ref_) => {	×
487	let as_ref = ref_.mutability.is_some();	×
488	match ref_.elem.as_ref() {	×
489	Type::Slice(slice) => (	×
490	// TODO: Allow specifying the variadic type.
491	slice.elem.to_token_stream().to_string() == "& Zval",	×
492	as_ref,	×
493	ty.clone(),	×
494	),
495	_ => (false, as_ref, ty.clone()),	×
496	}
497	}
498	Type::Path(TypePath { path, .. }) => {	×
499	let mut as_ref = false;	×
500
501	// For for types that are `Option<&mut T>` to turn them into
502	// `Option<&T>`, marking the Arg as as "passed by reference".
503	let ty = path	×
504	.segments	×
505	.last()
506	.filter(\|seg\| seg.ident == "Option")	×
507	.and_then(\|seg\| {	×
508	if let PathArguments::AngleBracketed(args) = &seg.arguments {	×
509	args.args	×
510	.iter()	×
511	.find(\|arg\| matches!(arg, GenericArgument::Type(_)))	×
512	.and_then(\|ga\| match ga {	×
513	GenericArgument::Type(ty) => Some(match ty {	×
514	Type::Reference(r) => {	×
515	let mut new_ref = r.clone();	×
516	new_ref.mutability = None;	×
517	as_ref = true;	×
518	Type::Reference(new_ref)	×
519	}
520	_ => ty.clone(),	×
521	}),
522	_ => None,	×
523	})
524	} else {
525	None	×
526	}
527	})
528	.unwrap_or_else(\|\| ty.clone());	×
529	(false, as_ref, ty.clone())	×
530	}
531	_ => (false, false, ty.clone()),	×
532	}
533	}
534
535	/// Splits the typed arguments into two slices:
536	///
537	/// 1. Required arguments.
538	/// 2. Non-required arguments.
539	///
540	/// # Parameters
541	///
542	/// * `optional` - The first optional argument. If [`None`], the optional
543	/// arguments will be from the first nullable argument after the last
544	/// non-nullable argument to the end of the arguments.
545	pub fn split_args(&self, optional: Option<&Ident>) -> (&[TypedArg<'a>], &[TypedArg<'a>]) {	×
546	let mut mid = None;	×
547	for (i, arg) in self.typed.iter().enumerate() {	×
548	if let Some(optional) = optional {	×
549	if optional == arg.name {	×
550	mid.replace(i);	×
551	}
552	} else if mid.is_none() && arg.nullable {	×
553	mid.replace(i);	×
554	} else if !arg.nullable {	×
555	mid.take();	×
556	}
557	}
558	match mid {	×
559	Some(mid) => (&self.typed[..mid], &self.typed[mid..]),	×
560	None => (&self.typed[..], &self.typed[0..0]),	×
561	}
562	}
563	}
564
565	impl TypedArg<'_> {
566	/// Returns a 'clean type' with the lifetimes removed. This allows the type
567	/// to be used outside of the original function context.
568	fn clean_ty(&self) -> Type {	×
569	let mut ty = self.ty.clone();	×
570	ty.drop_lifetimes();	×
571
572	// Variadic arguments are passed as slices, so we need to extract the
573	// inner type.
574	if self.variadic {	×
575	let Type::Reference(reference) = &ty else {	×
576	return ty;	×
577	};
578
579	if let Type::Slice(inner) = &*reference.elem {	×
580	return *inner.elem.clone();
581	}
582	}
583
584	ty	×
585	}
586
587	/// Returns a token stream containing an argument declaration, where the
588	/// name of the variable holding the arg is the name of the argument.
589	fn arg_declaration(&self) -> TokenStream {	×
590	let name = self.name;	×
591	let val = self.arg_builder();	×
592	quote! {	×
593	let mut #name = #val;
594	}
595	}
596
597	/// Returns a token stream containing the `Arg` definition to be passed to
598	/// `ext-php-rs`.
599	fn arg_builder(&self) -> TokenStream {	×
600	let name = self.name.to_string();	×
601	let ty = self.clean_ty();	×
602	let null = if self.nullable {	×
603	Some(quote! { .allow_null() })	×
604	} else {
605	None	×
606	};
607	let default = self.default.as_ref().map(\|val\| {	×
608	let val = val.to_token_stream().to_string();	×
609	quote! {	×
610	.default(#val)
611	}
612	});
613	let as_ref = if self.as_ref {	×
614	Some(quote! { .as_ref() })	×
615	} else {
616	None	×
617	};
618	let variadic = self.variadic.then(\|\| quote! { .is_variadic() });	×
619	quote! {	×
620	::ext_php_rs::args::Arg::new(#name, <#ty as ::ext_php_rs::convert::FromZvalMut>::TYPE)
621	#null
622	#default
623	#as_ref
624	#variadic
625	}
626	}
627
628	/// Get the accessor used to access the value of the argument.
629	fn accessor(&self, bail_fn: impl Fn(TokenStream) -> TokenStream) -> TokenStream {	×
630	let name = self.name;	×
631	if let Some(default) = &self.default {	×
632	quote! {	×
633	#name.val().unwrap_or(#default.into())	×
634	}
635	} else if self.variadic {	×
636	quote! {	×
637	&#name.variadic_vals()	×
638	}
639	} else if self.nullable {	×
640	// Originally I thought we could just use the below case for `null` options, as
641	// `val()` will return `Option<Option<T>>`, however, this isn't the case when
642	// the argument isn't given, as the underlying zval is null.
643	quote! {	×
644	#name.val()	×
645	}
646	} else {
647	let bail = bail_fn(quote! {	×
648	::ext_php_rs::exception::PhpException::default(	×
649	concat!("Invalid value given for argument `", stringify!(#name), "`.").into()	×
650	)
651	});
652	quote! {	×
653	match #name.val() {	×
654	Some(val) => val,	×
655	None => {	×
656	#bail;	×
657	}
658	}
659	}
660	}
661	}
662	}
663
664	/// Returns true of the given type is nullable in PHP.
665	// TODO(david): Eventually move to compile-time constants for this (similar to
666	// FromZval::NULLABLE).
667	pub fn type_is_nullable(ty: &Type, has_default: bool) -> Result<bool> {	×
668	Ok(match ty {	×
669	syn::Type::Path(path) => {	×
670	has_default
671	\|\| path	×
672	.path	×
673	.segments	×
674	.iter()	×
675	.next_back()
676	.is_some_and(\|seg\| seg.ident == "Option")	×
677	}
678	syn::Type::Reference(_) => false, /* Reference cannot be nullable unless */	×
679	// wrapped in `Option` (in that case it'd be a Path).
680	_ => bail!(ty => "Unsupported argument type."),	×
681	})
682	}

davidcole1340 / ext-php-rs / 17032997319

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