From a5019a5745e5a4cd99b52b23f41aca85b3e5364f Mon Sep 17 00:00:00 2001
From: Nik Revenco <pm@nikrev.com>
Date: Tue, 21 Oct 2025 00:52:21 +0100
Subject: [PATCH] perf: pre-allocate arrays and maps

---
 src/file/format/ini.rs  | 2 +-
 src/file/format/json.rs | 4 ++--
 src/file/format/toml.rs | 4 ++--
 src/file/format/yaml.rs | 4 ++--
 4 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/file/format/ini.rs b/src/file/format/ini.rs
index 7394d6dd..7b3233ce 100644
--- a/src/file/format/ini.rs
+++ b/src/file/format/ini.rs
@@ -14,7 +14,7 @@ pub(crate) fn parse(
     for (sec, prop) in i.iter() {
         match sec {
             Some(sec) => {
-                let mut sec_map: Map<String, Value> = Map::new();
+                let mut sec_map: Map<String, Value> = Map::with_capacity(prop.len());
                 for (k, v) in prop.iter() {
                     sec_map.insert(
                         k.to_owned(),
diff --git a/src/file/format/json.rs b/src/file/format/json.rs
index 9100b662..1ab0f3b3 100644
--- a/src/file/format/json.rs
+++ b/src/file/format/json.rs
@@ -30,7 +30,7 @@ fn from_json_value(uri: Option<&String>, value: &serde_json::Value) -> Value {
         serde_json::Value::Bool(value) => Value::new(uri, ValueKind::Boolean(value)),
 
         serde_json::Value::Object(ref table) => {
-            let mut m = Map::new();
+            let mut m = Map::with_capacity(table.len());
 
             for (key, value) in table {
                 m.insert(key.clone(), from_json_value(uri, value));
@@ -40,7 +40,7 @@ fn from_json_value(uri: Option<&String>, value: &serde_json::Value) -> Value {
         }
 
         serde_json::Value::Array(ref array) => {
-            let mut l = Vec::new();
+            let mut l = Vec::with_capacity(array.len());
 
             for value in array {
                 l.push(from_json_value(uri, value));
diff --git a/src/file/format/toml.rs b/src/file/format/toml.rs
index 454a057c..e6ceacdf 100644
--- a/src/file/format/toml.rs
+++ b/src/file/format/toml.rs
@@ -13,7 +13,7 @@ pub(crate) fn parse(
 }
 
 fn from_toml_table(uri: Option<&String>, table: toml::Table) -> Map<String, Value> {
-    let mut m = Map::new();
+    let mut m = Map::with_capacity(table.len());
 
     for (key, value) in table {
         m.insert(key, from_toml_value(uri, value));
@@ -35,7 +35,7 @@ fn from_toml_value(uri: Option<&String>, value: toml::Value) -> Value {
         }
 
         toml::Value::Array(array) => {
-            let mut l = Vec::new();
+            let mut l = Vec::with_capacity(array.len());
 
             for value in array {
                 l.push(from_toml_value(uri, value));
diff --git a/src/file/format/yaml.rs b/src/file/format/yaml.rs
index f74c2d66..e827ab5d 100644
--- a/src/file/format/yaml.rs
+++ b/src/file/format/yaml.rs
@@ -45,7 +45,7 @@ fn from_yaml_value(
         yaml::Yaml::Integer(value) => Ok(Value::new(uri, ValueKind::I64(value))),
         yaml::Yaml::Boolean(value) => Ok(Value::new(uri, ValueKind::Boolean(value))),
         yaml::Yaml::Hash(ref table) => {
-            let mut m = Map::new();
+            let mut m = Map::with_capacity(table.len());
             for (key, value) in table {
                 match key {
                     yaml::Yaml::String(k) => m.insert(k.to_owned(), from_yaml_value(uri, value)?),
@@ -58,7 +58,7 @@ fn from_yaml_value(
             Ok(Value::new(uri, ValueKind::Table(m)))
         }
         yaml::Yaml::Array(ref array) => {
-            let mut l = Vec::new();
+            let mut l = Vec::with_capacity(array.len());
 
             for value in array {
                 l.push(from_yaml_value(uri, value)?);