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pub mod entity;
use std::hash::Hash;
use proc_macro2::TokenStream as TokenStream2;
use quote::{quote, ToTokens, TokenStreamExt};
use syn::spanned::Spanned;
use syn::{AttrStyle, Attribute, Lit};
use crate::sql_entity_graph::{
pgx_attribute::{ArgValue, PgxArg, PgxAttribute},
pgx_sql::PgxSql,
SqlGraphEntity,
};
pub trait ToSql {
fn to_sql(&self, context: &PgxSql) -> eyre::Result<String>;
}
pub type ToSqlFn =
fn(
&SqlGraphEntity,
&PgxSql,
) -> std::result::Result<String, Box<dyn std::error::Error + Send + Sync + 'static>>;
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct ToSqlConfig {
pub enabled: bool,
pub callback: Option<syn::Path>,
pub content: Option<syn::LitStr>,
}
impl From<bool> for ToSqlConfig {
fn from(enabled: bool) -> Self {
Self {
enabled,
callback: None,
content: None,
}
}
}
impl From<syn::Path> for ToSqlConfig {
fn from(path: syn::Path) -> Self {
Self {
enabled: true,
callback: Some(path),
content: None,
}
}
}
impl From<syn::LitStr> for ToSqlConfig {
fn from(content: syn::LitStr) -> Self {
Self {
enabled: true,
callback: None,
content: Some(content),
}
}
}
impl Default for ToSqlConfig {
fn default() -> Self {
Self {
enabled: true,
callback: None,
content: None,
}
}
}
const INVALID_ATTR_CONTENT: &str =
"expected `#[pgx(sql = content)]`, where `content` is a boolean, string, or path to a function";
impl ToSqlConfig {
pub fn from_attribute(attr: &Attribute) -> Result<Option<Self>, syn::Error> {
if attr.style != AttrStyle::Outer {
return Err(syn::Error::new(
attr.span(),
"#[pgx(sql = ..)] is only valid in an outer context",
));
}
let attr = attr.parse_args::<PgxAttribute>()?;
for arg in attr.args.iter() {
if let PgxArg::NameValue(ref nv) = arg {
if !nv.path.is_ident("sql") {
continue;
}
match nv.value {
ArgValue::Path(ref callback_path) => {
return Ok(Some(Self {
enabled: true,
callback: Some(callback_path.clone()),
content: None,
}));
}
ArgValue::Lit(Lit::Bool(ref b)) => {
return Ok(Some(Self {
enabled: b.value,
callback: None,
content: None,
}));
}
ArgValue::Lit(Lit::Str(ref s)) => {
return Ok(Some(Self {
enabled: true,
callback: None,
content: Some(s.clone()),
}));
}
ArgValue::Lit(ref other) => {
return Err(syn::Error::new(other.span(), INVALID_ATTR_CONTENT));
}
}
}
}
Ok(None)
}
pub fn from_attributes(attrs: &[Attribute]) -> Result<Option<Self>, syn::Error> {
if let Some(attr) = attrs.iter().find(|attr| attr.path.is_ident("pgx")) {
Self::from_attribute(attr)
} else {
Ok(None)
}
}
}
impl ToTokens for ToSqlConfig {
fn to_tokens(&self, tokens: &mut TokenStream2) {
let enabled = self.enabled;
let callback = &self.callback;
let content = &self.content;
if let Some(callback_path) = callback {
tokens.append_all(quote! {
::pgx::utils::sql_entity_graph::ToSqlConfigEntity {
enabled: #enabled,
callback: Some(#callback_path),
content: None,
}
});
return;
}
if let Some(sql) = content {
tokens.append_all(quote! {
::pgx::utils::sql_entity_graph::ToSqlConfigEntity {
enabled: #enabled,
callback: None,
content: Some(#sql),
}
});
return;
}
tokens.append_all(quote! {
::pgx::utils::sql_entity_graph::ToSqlConfigEntity {
enabled: #enabled,
callback: None,
content: None,
}
});
}
}