perf(function): cache ValueFactory regexes

Author: iamgio

CHANGELOG.md

@@ -2,6 +2,21 @@
 
 ## [Unreleased]
 
+### Added
+
+#### [Permission system](https://quarkdown.com/wiki/cli-compiler#permissions)
+
+Quarkdown's permission system controls what a document can access during compilation, for increased safety.
+If the compiler attempts an action that requires a permission it doesn't have, an error is raised.
+
+You can grant or revoke permissions with the `--allow` and `--deny` flags:
+
+```shell
+quarkdown c main.qd --allow global-read --deny native-content
+```
+
+Available permissions: `project-read` (default), `global-read`, `network`, `native-content` (default), `all`. See the wiki page for more details.
+
 ### Changed
 
 #### Parallel rendering

quarkdown-core/src/main/kotlin/com/quarkdown/core/function/value/factory/ValueFactory.kt

@@ -62,13 +62,24 @@ import com.quarkdown.core.pipeline.stages.ParsingStage
 import com.quarkdown.core.util.iterator
 import com.quarkdown.core.util.node.conversion.list.MarkdownListToCollectionValue
 import com.quarkdown.core.util.node.conversion.list.MarkdownListToDictionaryValue
+import kotlin.collections.map
 
 /**
  * Prefix that forces a generic expression to be parsed as a lambda block.
  * @see ValueFactory.expression
  */
 private const val EXPRESSION_FORCE_LAMBDA_PREFIX = "@lambda "
 
+/**
+ * Pre-compiled regex for stripping comments from expressions.
+ */
+private val COMMENT_REGEX = PatternHelpers.COMMENT.toRegex()
+
+/**
+ * Pre-compiled regex for splitting whitespace-separated size values.
+ */
+private val WHITESPACE_REGEX = "\\s+".toRegex()
+
 /**
  * Factory of [Value] wrappers from raw data.
  * @see com.quarkdown.core.function.reflect.FromDynamicType
@@ -213,7 +224,7 @@ object ValueFactory {
     fun sizes(raw: Any): ObjectValue<Sizes> {
         if (raw is Sizes) return ObjectValue(raw)
 
-        val parts = raw.toString().split("\\s+".toRegex())
+        val parts = raw.toString().split(WHITESPACE_REGEX)
         val iterator = parts.iterator()
 
         return ObjectValue(
@@ -541,7 +552,7 @@ object ValueFactory {
         }
 
         // Strip comments.
-        val rawCode = raw.toString().replace(PatternHelpers.COMMENT.toRegex(), "")
+        val rawCode = raw.toString().replace(COMMENT_REGEX, "")
 
         if (rawCode.isEmpty()) return DynamicValue("")