Swift: Add integral type classes.

swift/ql/lib/codeql/swift/elements/type/FloatingPointType.qll

@@ -0,0 +1,12 @@
+private import swift
+
+/**
+ * A floating-point type. This includes the `Float` type, the `Double`, and
+ * builtin floating-point types.
+ */
+class FloatingPointType extends Type {
+  FloatingPointType() {
+    this.getName() = ["Float", "Double"] or
+    this instanceof BuiltinFloatType
+  }
+}

swift/ql/lib/codeql/swift/elements/type/NumericOrCharType.qll

@@ -0,0 +1,35 @@
+private import swift
+
+/** The `Character` type. */
+class CharacterType extends StructType {
+  CharacterType() { this.getName() = "Character" }
+}
+
+/**
+ * An integer-like type. For example, `Int`, `Int16`, `Uint16`, etc.
+ */
+class IntegerType extends Type {
+  IntegerType() {
+    this.getName() =
+      ["Int", "Int8", "Int16", "Int32", "Int64", "UInt", "UInt8", "Uint16", "Uint32", "UInt64"]
+    or
+    this instanceof BuiltinIntegerType
+  }
+}
+
+/** The `Bool` type. */
+class BooleanType extends Type {
+  BooleanType() { this.getName() = "Bool" }
+}
+
+/**
+ * A numeric-like type. This includes the types `Character`, `Bool`, and all
+ * the integer-like types.
+ */
+class NumericOrCharType extends Type {
+  NumericOrCharType() {
+    this instanceof CharacterType or
+    this instanceof IntegerType or
+    this instanceof BooleanType
+  }
+}

swift/ql/lib/swift.qll

@@ -10,4 +10,5 @@ import codeql.swift.elements.expr.InitializerCallExpr
 import codeql.swift.elements.expr.SelfRefExpr
 import codeql.swift.elements.decl.MethodDecl
 import codeql.swift.elements.decl.ClassOrStructDecl
+import codeql.swift.elements.type.NumericOrCharType
 import codeql.swift.Unit