Moved constraint variant outside of TableConstraint enum

src/ast/ddl.rs

@@ -30,15 +30,19 @@ use sqlparser_derive::{Visit, VisitMut};
 
 use crate::ast::value::escape_single_quote_string;
 use crate::ast::{
-    display_comma_separated, display_separated, ArgMode, CommentDef, ConditionalStatements,
-    CreateFunctionBody, CreateFunctionUsing, CreateTableLikeKind, CreateTableOptions, DataType,
-    Expr, FileFormat, FunctionBehavior, FunctionCalledOnNull, FunctionDeterminismSpecifier,
-    FunctionParallel, HiveDistributionStyle, HiveFormat, HiveIOFormat, HiveRowFormat, Ident,
-    InitializeKind, MySQLColumnPosition, ObjectName, OnCommit, OneOrManyWithParens,
-    OperateFunctionArg, OrderByExpr, ProjectionSelect, Query, RefreshModeKind, RowAccessPolicy,
-    SequenceOptions, Spanned, SqlOption, StorageSerializationPolicy, TableVersion, Tag,
-    TriggerEvent, TriggerExecBody, TriggerObject, TriggerPeriod, TriggerReferencing, Value,
-    ValueWithSpan, WrappedCollection,
+    display_comma_separated, display_separated,
+    table_constraints::{
+        CheckConstraint, ForeignKeyConstraint, FullTextOrSpatialConstraint, IndexConstraint,
+        PrimaryKeyConstraint, UniqueConstraint,
+    },
+    ArgMode, CommentDef, ConditionalStatements, CreateFunctionBody, CreateFunctionUsing,
+    CreateTableLikeKind, CreateTableOptions, DataType, Expr, FileFormat, FunctionBehavior,
+    FunctionCalledOnNull, FunctionDeterminismSpecifier, FunctionParallel, HiveDistributionStyle,
+    HiveFormat, HiveIOFormat, HiveRowFormat, Ident, InitializeKind, MySQLColumnPosition,
+    ObjectName, OnCommit, OneOrManyWithParens, OperateFunctionArg, OrderByExpr, ProjectionSelect,
+    Query, RefreshModeKind, RowAccessPolicy, SequenceOptions, Spanned, SqlOption,
+    StorageSerializationPolicy, TableVersion, Tag, TriggerEvent, TriggerExecBody, TriggerObject,
+    TriggerPeriod, TriggerReferencing, Value, ValueWithSpan, WrappedCollection,
 };
 use crate::display_utils::{DisplayCommaSeparated, Indent, NewLine, SpaceOrNewline};
 use crate::keywords::Keyword;
@@ -1047,26 +1051,7 @@ pub enum TableConstraint {
     /// [2]: IndexType
     /// [3]: IndexOption
     /// [4]: KeyOrIndexDisplay
-    Unique {
-        /// Constraint name.
-        ///
-        /// Can be not the same as `index_name`
-        name: Option<Ident>,
-        /// Index name
-        index_name: Option<Ident>,
-        /// Whether the type is followed by the keyword `KEY`, `INDEX`, or no keyword at all.
-        index_type_display: KeyOrIndexDisplay,
-        /// Optional `USING` of [index type][1] statement before columns.
-        ///
-        /// [1]: IndexType
-        index_type: Option<IndexType>,
-        /// Identifiers of the columns that are unique.
-        columns: Vec<IndexColumn>,
-        index_options: Vec<IndexOption>,
-        characteristics: Option<ConstraintCharacteristics>,
-        /// Optional Postgres nulls handling: `[ NULLS [ NOT ] DISTINCT ]`
-        nulls_distinct: NullsDistinctOption,
-    },
+    Unique(UniqueConstraint),
     /// MySQL [definition][1] for `PRIMARY KEY` constraints statements:\
     /// * `[CONSTRAINT [<name>]] PRIMARY KEY [index_name] [index_type] (<columns>) <index_options>`
     ///
@@ -1085,67 +1070,22 @@ pub enum TableConstraint {
     /// [1]: https://dev.mysql.com/doc/refman/8.3/en/create-table.html
     /// [2]: IndexType
     /// [3]: IndexOption
-    PrimaryKey {
-        /// Constraint name.
-        ///
-        /// Can be not the same as `index_name`
-        name: Option<Ident>,
-        /// Index name
-        index_name: Option<Ident>,
-        /// Optional `USING` of [index type][1] statement before columns.
-        ///
-        /// [1]: IndexType
-        index_type: Option<IndexType>,
-        /// Identifiers of the columns that form the primary key.
-        columns: Vec<IndexColumn>,
-        index_options: Vec<IndexOption>,
-        characteristics: Option<ConstraintCharacteristics>,
-    },
+    PrimaryKey(PrimaryKeyConstraint),
     /// A referential integrity constraint (`[ CONSTRAINT <name> ] FOREIGN KEY (<columns>)
     /// REFERENCES <foreign_table> (<referred_columns>)
     /// { [ON DELETE <referential_action>] [ON UPDATE <referential_action>] |
     ///   [ON UPDATE <referential_action>] [ON DELETE <referential_action>]
     /// }`).
-    ForeignKey {
-        name: Option<Ident>,
-        /// MySQL-specific field
-        /// <https://dev.mysql.com/doc/refman/8.4/en/create-table-foreign-keys.html>
-        index_name: Option<Ident>,
-        columns: Vec<Ident>,
-        foreign_table: ObjectName,
-        referred_columns: Vec<Ident>,
-        on_delete: Option<ReferentialAction>,
-        on_update: Option<ReferentialAction>,
-        characteristics: Option<ConstraintCharacteristics>,
-    },
+    ForeignKey(ForeignKeyConstraint),
     /// `[ CONSTRAINT <name> ] CHECK (<expr>) [[NOT] ENFORCED]`
-    Check {
-        name: Option<Ident>,
-        expr: Box<Expr>,
-        /// MySQL-specific syntax
-        /// <https://dev.mysql.com/doc/refman/8.4/en/create-table.html>
-        enforced: Option<bool>,
-    },
+    Check(CheckConstraint),
     /// MySQLs [index definition][1] for index creation. Not present on ANSI so, for now, the usage
     /// is restricted to MySQL, as no other dialects that support this syntax were found.
     ///
     /// `{INDEX | KEY} [index_name] [index_type] (key_part,...) [index_option]...`
     ///
     /// [1]: https://dev.mysql.com/doc/refman/8.0/en/create-table.html
-    Index {
-        /// Whether this index starts with KEY (true) or INDEX (false), to maintain the same syntax.
-        display_as_key: bool,
-        /// Index name.
-        name: Option<Ident>,
-        /// Optional [index type][1].
-        ///
-        /// [1]: IndexType
-        index_type: Option<IndexType>,
-        /// Referred column identifier list.
-        columns: Vec<IndexColumn>,
-        /// Optional index options such as `USING`; see [`IndexOption`].
-        index_options: Vec<IndexOption>,
-    },
+    Index(IndexConstraint),
     /// MySQLs [fulltext][1] definition. Since the [`SPATIAL`][2] definition is exactly the same,
     /// and MySQL displays both the same way, it is part of this definition as well.
     ///
@@ -1159,157 +1099,54 @@ pub enum TableConstraint {
     ///
     /// [1]: https://dev.mysql.com/doc/refman/8.0/en/fulltext-natural-language.html
     /// [2]: https://dev.mysql.com/doc/refman/8.0/en/spatial-types.html
-    FulltextOrSpatial {
-        /// Whether this is a `FULLTEXT` (true) or `SPATIAL` (false) definition.
-        fulltext: bool,
-        /// Whether the type is followed by the keyword `KEY`, `INDEX`, or no keyword at all.
-        index_type_display: KeyOrIndexDisplay,
-        /// Optional index name.
-        opt_index_name: Option<Ident>,
-        /// Referred column identifier list.
-        columns: Vec<IndexColumn>,
-    },
+    FulltextOrSpatial(FullTextOrSpatialConstraint),
 }
 
-impl fmt::Display for TableConstraint {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        match self {
-            TableConstraint::Unique {
-                name,
-                index_name,
-                index_type_display,
-                index_type,
-                columns,
-                index_options,
-                characteristics,
-                nulls_distinct,
-            } => {
-                write!(
-                    f,
-                    "{}UNIQUE{nulls_distinct}{index_type_display:>}{}{} ({})",
-                    display_constraint_name(name),
-                    display_option_spaced(index_name),
-                    display_option(" USING ", "", index_type),
-                    display_comma_separated(columns),
-                )?;
-
-                if !index_options.is_empty() {
-                    write!(f, " {}", display_separated(index_options, " "))?;
-                }
-
-                write!(f, "{}", display_option_spaced(characteristics))?;
-                Ok(())
-            }
-            TableConstraint::PrimaryKey {
-                name,
-                index_name,
-                index_type,
-                columns,
-                index_options,
-                characteristics,
-            } => {
-                write!(
-                    f,
-                    "{}PRIMARY KEY{}{} ({})",
-                    display_constraint_name(name),
-                    display_option_spaced(index_name),
-                    display_option(" USING ", "", index_type),
-                    display_comma_separated(columns),
-                )?;
+impl From<UniqueConstraint> for TableConstraint {
+    fn from(constraint: UniqueConstraint) -> Self {
+        TableConstraint::Unique(constraint)
+    }
+}
 
-                if !index_options.is_empty() {
-                    write!(f, " {}", display_separated(index_options, " "))?;
-                }
+impl From<PrimaryKeyConstraint> for TableConstraint {
+    fn from(constraint: PrimaryKeyConstraint) -> Self {
+        TableConstraint::PrimaryKey(constraint)
+    }
+}
 
-                write!(f, "{}", display_option_spaced(characteristics))?;
-                Ok(())
-            }
-            TableConstraint::ForeignKey {
-                name,
-                index_name,
-                columns,
-                foreign_table,
-                referred_columns,
-                on_delete,
-                on_update,
-                characteristics,
-            } => {
-                write!(
-                    f,
-                    "{}FOREIGN KEY{} ({}) REFERENCES {}",
-                    display_constraint_name(name),
-                    display_option_spaced(index_name),
-                    display_comma_separated(columns),
-                    foreign_table,
-                )?;
-                if !referred_columns.is_empty() {
-                    write!(f, "({})", display_comma_separated(referred_columns))?;
-                }
-                if let Some(action) = on_delete {
-                    write!(f, " ON DELETE {action}")?;
-                }
-                if let Some(action) = on_update {
-                    write!(f, " ON UPDATE {action}")?;
-                }
-                if let Some(characteristics) = characteristics {
-                    write!(f, " {characteristics}")?;
-                }
-                Ok(())
-            }
-            TableConstraint::Check {
-                name,
-                expr,
-                enforced,
-            } => {
-                write!(f, "{}CHECK ({})", display_constraint_name(name), expr)?;
-                if let Some(b) = enforced {
-                    write!(f, " {}", if *b { "ENFORCED" } else { "NOT ENFORCED" })
-                } else {
-                    Ok(())
-                }
-            }
-            TableConstraint::Index {
-                display_as_key,
-                name,
-                index_type,
-                columns,
-                index_options,
-            } => {
-                write!(f, "{}", if *display_as_key { "KEY" } else { "INDEX" })?;
-                if let Some(name) = name {
-                    write!(f, " {name}")?;
-                }
-                if let Some(index_type) = index_type {
-                    write!(f, " USING {index_type}")?;
-                }
-                write!(f, " ({})", display_comma_separated(columns))?;
-                if !index_options.is_empty() {
-                    write!(f, " {}", display_comma_separated(index_options))?;
-                }
-                Ok(())
-            }
-            Self::FulltextOrSpatial {
-                fulltext,
-                index_type_display,
-                opt_index_name,
-                columns,
-            } => {
-                if *fulltext {
-                    write!(f, "FULLTEXT")?;
-                } else {
-                    write!(f, "SPATIAL")?;
-                }
+impl From<ForeignKeyConstraint> for TableConstraint {
+    fn from(constraint: ForeignKeyConstraint) -> Self {
+        TableConstraint::ForeignKey(constraint)
+    }
+}
 
-                write!(f, "{index_type_display:>}")?;
+impl From<CheckConstraint> for TableConstraint {
+    fn from(constraint: CheckConstraint) -> Self {
+        TableConstraint::Check(constraint)
+    }
+}
 
-                if let Some(name) = opt_index_name {
-                    write!(f, " {name}")?;
-                }
+impl From<IndexConstraint> for TableConstraint {
+    fn from(constraint: IndexConstraint) -> Self {
+        TableConstraint::Index(constraint)
+    }
+}
 
-                write!(f, " ({})", display_comma_separated(columns))?;
+impl From<FullTextOrSpatialConstraint> for TableConstraint {
+    fn from(constraint: FullTextOrSpatialConstraint) -> Self {
+        TableConstraint::FulltextOrSpatial(constraint)
+    }
+}
 
-                Ok(())
-            }
+impl fmt::Display for TableConstraint {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            TableConstraint::Unique(constraint) => constraint.fmt(f),
+            TableConstraint::PrimaryKey(constraint) => constraint.fmt(f),
+            TableConstraint::ForeignKey(constraint) => constraint.fmt(f),
+            TableConstraint::Check(constraint) => constraint.fmt(f),
+            TableConstraint::Index(constraint) => constraint.fmt(f),
+            TableConstraint::FulltextOrSpatial(constraint) => constraint.fmt(f),
         }
     }
 }
@@ -2065,7 +1902,7 @@ pub enum GeneratedExpressionMode {
 }
 
 #[must_use]
-fn display_constraint_name(name: &'_ Option<Ident>) -> impl fmt::Display + '_ {
+pub fn display_constraint_name(name: &'_ Option<Ident>) -> impl fmt::Display + '_ {
     struct ConstraintName<'a>(&'a Option<Ident>);
     impl fmt::Display for ConstraintName<'_> {
         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
@@ -2082,7 +1919,7 @@ fn display_constraint_name(name: &'_ Option<Ident>) -> impl fmt::Display + '_ {
 /// * `Some(inner)` => create display struct for `"{prefix}{inner}{postfix}"`
 /// * `_` => do nothing
 #[must_use]
-fn display_option<'a, T: fmt::Display>(
+pub fn display_option<'a, T: fmt::Display>(
     prefix: &'a str,
     postfix: &'a str,
     option: &'a Option<T>,
@@ -2104,7 +1941,7 @@ fn display_option<'a, T: fmt::Display>(
 /// * `Some(inner)` => create display struct for `" {inner}"`
 /// * `_` => do nothing
 #[must_use]
-fn display_option_spaced<T: fmt::Display>(option: &Option<T>) -> impl fmt::Display + '_ {
+pub fn display_option_spaced<T: fmt::Display>(option: &Option<T>) -> impl fmt::Display + '_ {
     display_option(" ", "", option)
 }
 

src/ast/mod.rs

@@ -118,6 +118,11 @@ mod dcl;
 mod ddl;
 mod dml;
 pub mod helpers;
+pub mod table_constraints;
+pub use table_constraints::{
+    CheckConstraint, ForeignKeyConstraint, FullTextOrSpatialConstraint, IndexConstraint,
+    PrimaryKeyConstraint, UniqueConstraint,
+};
 mod operator;
 mod query;
 mod spans;