Move schema parsing to its own package

pkg/schema/table.go

@@ -0,0 +1,34 @@
+package schema
+
+// Column represents a single column in a table.
+type Column struct {
+	TableName              string `db:"table_name"`
+	Name                   string `db:"column_name"`
+	Type                   string `db:"column_type"`
+	IsNotNull              bool   `db:"notnull"`
+	HasDefaultValue        bool   `db:"has_default_value"`
+	DefaultValue           string `db:"dflt_value"`
+	IsPrimaryKey           bool   `db:"is_primary_key"`
+	IsForeignKey           bool   `db:"is_foreign_key"`
+	ForeignKeyTargetTable  string `db:"fk_target_table"`
+	ForeignKeyTargetColumn string `db:"fk_target_column"`
+}
+
+// IsNullableForeignKey is a helper function.
+func (c Column) IsNullableForeignKey() bool {
+	return !c.IsNotNull && !c.IsPrimaryKey && c.IsForeignKey
+}
+
+// Table is a single SQLite table.
+type Table struct {
+	TableName string `db:"name"`
+	IsStrict  bool   `db:"strict"`
+	Columns   []Column
+
+	TypeIDName string
+	VarName    string
+	TypeName   string
+}
+
+// Schema is a container for a bunch of Tables, indexed by table name.
+type Schema map[string]Table