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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,188 @@ | ||
| use std::collections::HashMap; | ||
|
|
||
| use swc_atoms::JsWord; | ||
| use swc_common::DUMMY_SP; | ||
| use swc_ecma_visit::swc_ecma_ast::{ | ||
| Expr, KeyValueProp, Lit, ObjectLit, Prop, PropName, PropOrSpread, Str, | ||
| }; | ||
|
|
||
| enum KeyStrategy { | ||
| Merge, | ||
| Override, | ||
| } | ||
|
|
||
| /** | ||
| * Inserts all the keys / values from b into a. | ||
| * On clash: | ||
| * - if both values are objects, merge | ||
| * - otherwise, overwrite with b | ||
| * | ||
| * todo(arlyon): this could be slow for many keys | ||
| */ | ||
| pub fn merge_literals(mut a: ObjectLit, b: ObjectLit) -> ObjectLit { | ||
| let mut strategies: HashMap<JsWord, (usize, KeyStrategy)> = Default::default(); | ||
|
|
||
| for (idx, prop) in a.props.iter().enumerate() { | ||
| if let PropOrSpread::Prop(box Prop::KeyValue(KeyValueProp { | ||
| key: PropName::Str(Str { value: name, .. }), | ||
| value: box value, | ||
| })) = prop | ||
| { | ||
| strategies.insert( | ||
| name.to_owned(), | ||
| ( | ||
| idx, | ||
| match value { | ||
| Expr::Object(_) => KeyStrategy::Merge, | ||
| _ => KeyStrategy::Override, | ||
| }, | ||
| ), | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| for prop in b.props { | ||
| if let PropOrSpread::Prop(box Prop::KeyValue(KeyValueProp { | ||
| key: PropName::Str(Str { value: name, .. }), | ||
| .. | ||
| })) = &prop | ||
| { | ||
| match strategies.get(name) { | ||
| Some((idx, KeyStrategy::Merge)) => { | ||
| if let ( | ||
| Some(PropOrSpread::Prop(box Prop::KeyValue(KeyValueProp { | ||
| value: box Expr::Object(lit1), | ||
| .. | ||
| }))), | ||
| PropOrSpread::Prop(box Prop::KeyValue(KeyValueProp { | ||
| value: box Expr::Object(lit2), | ||
| .. | ||
| })), | ||
| ) = (a.props.get_mut(*idx), prop) | ||
| { | ||
| let temp = std::mem::replace(lit1, to_lit(&[])); | ||
| std::mem::replace(lit1, merge_literals(temp, lit2)); | ||
| } | ||
| } | ||
| Some((idx, KeyStrategy::Override)) => a.props.insert(*idx, prop), | ||
| _ => a.props.push(prop), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| a | ||
| } | ||
|
|
||
| pub fn to_lit(items: &[(&str, &str)]) -> ObjectLit { | ||
| ObjectLit { | ||
| span: DUMMY_SP, | ||
| props: items | ||
| .iter() | ||
| .map(|(key, value)| { | ||
| PropOrSpread::Prop(Box::new(Prop::KeyValue(KeyValueProp { | ||
| key: PropName::Str(Str { | ||
| span: DUMMY_SP, | ||
| raw: None, | ||
| value: (*key).into(), | ||
| }), | ||
| value: Box::new(Expr::Lit(Lit::Str(Str { | ||
| span: DUMMY_SP, | ||
| raw: None, | ||
| value: (*value).into(), | ||
| }))), | ||
| }))) | ||
| }) | ||
| .collect(), | ||
| } | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod test { | ||
| use swc_common::DUMMY_SP; | ||
| use swc_ecma_visit::swc_ecma_ast::{ | ||
| Expr, KeyValueProp, Lit, ObjectLit, Prop, PropName, PropOrSpread, Str, | ||
| }; | ||
|
|
||
| use crate::util::{merge_literals, to_lit}; | ||
|
|
||
| #[test] | ||
| fn a_and_b_merges() { | ||
| let a = to_lit(&[("a", "value")]); | ||
| let b = to_lit(&[("b", "value")]); | ||
| let c = merge_literals(a, b); | ||
| assert!(c.props.len() == 2); | ||
| } | ||
|
|
||
| #[test] | ||
| fn empty_b_does_nothing() { | ||
| let a = ObjectLit { | ||
| span: DUMMY_SP, | ||
| props: vec![], | ||
| }; | ||
|
|
||
| let b = ObjectLit { | ||
| span: DUMMY_SP, | ||
| props: vec![], | ||
| }; | ||
|
|
||
| let c = merge_literals(a.clone(), b); | ||
|
|
||
| assert!(a.eq(&c)); | ||
| } | ||
|
|
||
| #[test] | ||
| fn override_b_replaces() { | ||
| let a = to_lit(&[("replace", "a")]); | ||
| let b = to_lit(&[("replace", "b")]); | ||
|
|
||
| let c = merge_literals(a.clone(), b); | ||
|
|
||
| if let PropOrSpread::Prop(box Prop::KeyValue(KeyValueProp { | ||
| value: box Expr::Lit(Lit::Str(Str { value, .. })), | ||
| .. | ||
| })) = &c.props[0] | ||
| { | ||
| assert!("b".eq(&*value)) | ||
| } else { | ||
| panic!("fail") | ||
| } | ||
| } | ||
|
|
||
| #[test] | ||
| fn mergeable_b_merges() { | ||
| let a = ObjectLit { | ||
| span: DUMMY_SP, | ||
| props: vec![PropOrSpread::Prop(Box::new(Prop::KeyValue(KeyValueProp { | ||
| value: Box::new(Expr::Object(to_lit(&[("a", "value")]))), | ||
| key: PropName::Str(Str { | ||
| raw: None, | ||
| span: DUMMY_SP, | ||
| value: "merge".into(), | ||
| }), | ||
| })))], | ||
| }; | ||
| let b = ObjectLit { | ||
| span: DUMMY_SP, | ||
| props: vec![PropOrSpread::Prop(Box::new(Prop::KeyValue(KeyValueProp { | ||
| value: Box::new(Expr::Object(to_lit(&[("b", "value")]))), | ||
| key: PropName::Str(Str { | ||
| raw: None, | ||
| span: DUMMY_SP, | ||
| value: "merge".into(), | ||
| }), | ||
| })))], | ||
| }; | ||
|
|
||
| let c = merge_literals(a.clone(), b); | ||
|
|
||
| if let PropOrSpread::Prop(box Prop::KeyValue(KeyValueProp { | ||
| value: box Expr::Object(ObjectLit { props, .. }), | ||
| .. | ||
| })) = &c.props[0] | ||
| { | ||
| assert!(props.len() == 2) | ||
| } else { | ||
| panic!("fail") | ||
| } | ||
| } | ||
| } |