set useFastDoubleParser parser option to true by default and updated …

…KDocs

core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/api/parse.kt

@@ -11,6 +11,7 @@ import org.jetbrains.kotlinx.dataframe.impl.api.Parsers
 import org.jetbrains.kotlinx.dataframe.impl.api.StringParser
 import org.jetbrains.kotlinx.dataframe.impl.api.parseImpl
 import org.jetbrains.kotlinx.dataframe.impl.api.tryParseImpl
+import org.jetbrains.kotlinx.dataframe.impl.io.FastDoubleParser
 import org.jetbrains.kotlinx.dataframe.io.readCSV
 import org.jetbrains.kotlinx.dataframe.typeClass
 import org.jetbrains.kotlinx.dataframe.util.PARSER_OPTIONS
@@ -45,6 +46,12 @@ public fun <T, C> DataFrame<T>.parse(vararg columns: ColumnReference<C>, options
 public fun <T, C> DataFrame<T>.parse(vararg columns: KProperty<C>, options: ParserOptions? = null): DataFrame<T> =
     parse(options) { columns.toColumnSet() }
 
+/**
+ * Global counterpart of [ParserOptions].
+ * Settings changed here will affect the defaults for all parsing operations.
+ *
+ * The default values are set by [Parsers.resetToDefault].
+ */
 public interface GlobalParserOptions {
 
     public fun addDateTimePattern(pattern: String)
@@ -54,7 +61,7 @@ public interface GlobalParserOptions {
     /** This function can be called to skip some types. Parsing will be attempted for all other types. */
     public fun addSkipType(type: KType)
 
-    /** Whether to use the new _experimental_ FastDoubleParser, defaults to `false` for now. */
+    /** Whether to use [FastDoubleParser], defaults to `true`. Please report any issues you encounter. */
     public var useFastDoubleParser: Boolean
 
     public fun resetToDefault()
@@ -91,7 +98,7 @@ public interface GlobalParserOptions {
  *   `["null", "NULL", "NA", "N/A"]`.
  * @param skipTypes a set of types that should be skipped during parsing. Parsing will be attempted for all other types.
  *   By default, it's an empty set. To skip all types except a specified one, use [convertTo] instead.
- * @param useFastDoubleParser whether to use the new _experimental_ FastDoubleParser, defaults to `false` for now.
+ * @param useFastDoubleParser whether to use [FastDoubleParser], defaults to `true`. Please report any issues you encounter.
  */
 public class ParserOptions(
     public val locale: Locale? = null,

core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/impl/api/parse.kt

@@ -25,11 +25,13 @@ import org.jetbrains.kotlinx.dataframe.api.isColumnGroup
 import org.jetbrains.kotlinx.dataframe.api.isFrameColumn
 import org.jetbrains.kotlinx.dataframe.api.isSubtypeOf
 import org.jetbrains.kotlinx.dataframe.api.map
+import org.jetbrains.kotlinx.dataframe.api.parser
 import org.jetbrains.kotlinx.dataframe.api.to
 import org.jetbrains.kotlinx.dataframe.columns.TypeSuggestion
 import org.jetbrains.kotlinx.dataframe.columns.size
 import org.jetbrains.kotlinx.dataframe.exceptions.TypeConversionException
 import org.jetbrains.kotlinx.dataframe.hasNulls
+import org.jetbrains.kotlinx.dataframe.impl.asNullable
 import org.jetbrains.kotlinx.dataframe.impl.canParse
 import org.jetbrains.kotlinx.dataframe.impl.catchSilent
 import org.jetbrains.kotlinx.dataframe.impl.createStarProjectedType
@@ -47,6 +49,7 @@ import java.time.format.DateTimeFormatterBuilder
 import java.time.temporal.Temporal
 import java.time.temporal.TemporalQuery
 import java.util.Locale
+import kotlin.properties.Delegates
 import kotlin.reflect.KClass
 import kotlin.reflect.KType
 import kotlin.reflect.full.withNullability
@@ -114,6 +117,13 @@ internal class StringParserWithFormat<T>(
     }
 }
 
+/**
+ * Central implementation for [GlobalParserOptions].
+ *
+ * Can be obtained by a user by calling [DataFrame.parser][DataFrame.Companion.parser].
+ *
+ * Defaults are set by [resetToDefault].
+ */
 internal object Parsers : GlobalParserOptions {
 
     private val formatters: MutableList<DateTimeFormatter> = mutableListOf()
@@ -140,7 +150,7 @@ internal object Parsers : GlobalParserOptions {
         skipTypesSet.add(type)
     }
 
-    override var useFastDoubleParser: Boolean = false
+    override var useFastDoubleParser by Delegates.notNull<Boolean>()
 
     private var _locale: Locale? = null
 
@@ -165,7 +175,7 @@ internal object Parsers : GlobalParserOptions {
             .toFormatter()
             .let { formatters.add(it) }
 
-        useFastDoubleParser = false
+        useFastDoubleParser = true
         _locale = null
         nullStrings.addAll(listOf("null", "NULL", "NA", "N/A"))
     }

core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/impl/io/FastDoubleParser.kt

@@ -24,8 +24,8 @@ private val NANS = arrayOf("nan", "na", "n/a")
 /**
  * Parses a [String]/[CharSequence], [CharArray], or [ByteArray] into a [Double].
  *
- * If [ParserOptions.useFastDoubleParser] is enabled, it will try to parse the input with an _EXPERIMENTAL_
- * fast double parser, [FastDoubleParser](https://github.com/wrandelshofer/FastDoubleParser).
+ * If [ParserOptions.useFastDoubleParser] is enabled, it will try to parse the input with the
+ * fast double parser library, [FastDoubleParser](https://github.com/wrandelshofer/FastDoubleParser).
  * If not, or if it fails, it will use [NumberFormat] to parse the input.
  *
  * Public, so it can be used in other modules.

dataframe-csv/src/main/kotlin/org/jetbrains/kotlinx/dataframe/documentation/DelimParams.kt

@@ -138,8 +138,6 @@ internal object DelimParams {
      *   ([DataFrame.parser][DataFrame.Companion.parser]) will be queried.
      *
      *   The only exceptions are:
-     *   - [useFastDoubleParser][ParserOptions.useFastDoubleParser], which will default to `true`,
-     *   regardless of the global setting.
      *   - [nullStrings][ParserOptions.nullStrings], which, if `null`,
      *   will take the global setting + {@include [DefaultNullStringsContentLink]}.
      *   - [skipTypes][ParserOptions.skipTypes], which will always add [typesDeephavenAlreadyParses] to

dataframe-csv/src/main/kotlin/org/jetbrains/kotlinx/dataframe/impl/io/readDelim.kt

@@ -112,11 +112,7 @@ internal fun readDelimImpl(
 ): DataFrame<*> {
     // set up the csv specs
     val csvSpecs = with(CsvSpecs.builder()) {
-        // turn on fast double parser if not explicitly set regardless of the global parser options
-        @Suppress("NullableBooleanElvis")
-        val adjustedParserOptions = (parserOptions ?: ParserOptions())
-            .copy(useFastDoubleParser = parserOptions?.useFastDoubleParser ?: true)
-        customDoubleParser(DataFrameCustomDoubleParser(adjustedParserOptions))
+        customDoubleParser(DataFrameCustomDoubleParser(parserOptions))
 
         // use the given nullStrings if provided, else take the global ones + some extras
         val nullStrings = parserOptions?.nullStrings ?: (DataFrame.parser.nulls + DEFAULT_DELIM_NULL_STRINGS)