From 5c094a011d2cd3521720270a53cc463aa292f6d3 Mon Sep 17 00:00:00 2001
From: Tobie Morgan Hitchcock <tobie@abcum.com>
Date: Thu, 21 Jul 2016 22:50:16 +0100
Subject: [PATCH] Add blueprint for defined RULES logic

---
 sql/ast.go        | 26 +++++++++++++++++++++
 sql/define.go     |  4 +++-
 sql/remove.go     |  4 +++-
 sql/rules.go      | 59 +++++++++++++++++++++++++++++++++++++++++++++++
 util/item/item.go | 10 ++++++++
 5 files changed, 101 insertions(+), 2 deletions(-)
 create mode 100644 sql/rules.go

diff --git a/sql/ast.go b/sql/ast.go
index 1277b787..c641abb5 100644
--- a/sql/ast.go
+++ b/sql/ast.go
@@ -149,6 +149,32 @@ type RecordStatement struct {
 	Echo Token // What to return
 }
 
+// --------------------------------------------------
+// Rules
+// --------------------------------------------------
+
+// DefineRulesStatement represents an SQL DEFINE RULES statement.
+//
+// DEFINE RULES person
+type DefineRulesStatement struct {
+	EX   bool    // Explain
+	KV   string  // Bucket
+	NS   string  // Namespace
+	DB   string  // Database
+	What []Table // Table names
+}
+
+// RemoveRulesStatement represents an SQL REMOVE RULES statement.
+//
+// REMOVE RULES person
+type RemoveRulesStatement struct {
+	EX   bool    // Explain
+	KV   string  // Bucket
+	NS   string  // Namespace
+	DB   string  // Database
+	What []Table // Table names
+}
+
 // --------------------------------------------------
 // Table
 // --------------------------------------------------
diff --git a/sql/define.go b/sql/define.go
index e06b4899..f7221a56 100644
--- a/sql/define.go
+++ b/sql/define.go
@@ -17,9 +17,11 @@ package sql
 func (p *Parser) parseDefineStatement(explain bool) (Statement, error) {
 
 	// Inspect the next token.
-	tok, _, err := p.shouldBe(TABLE, FIELD, INDEX)
+	tok, _, err := p.shouldBe(RULES, TABLE, FIELD, INDEX)
 
 	switch tok {
+	case RULES:
+		return p.parseDefineRulesStatement(explain)
 	case TABLE:
 		return p.parseDefineTableStatement(explain)
 	case FIELD:
diff --git a/sql/remove.go b/sql/remove.go
index ca65de96..5cb41edc 100644
--- a/sql/remove.go
+++ b/sql/remove.go
@@ -17,9 +17,11 @@ package sql
 func (p *Parser) parseRemoveStatement(explain bool) (Statement, error) {
 
 	// Inspect the next token.
-	tok, _, err := p.shouldBe(TABLE, FIELD, INDEX)
+	tok, _, err := p.shouldBe(RULES, TABLE, FIELD, INDEX)
 
 	switch tok {
+	case RULES:
+		return p.parseRemoveRulesStatement(explain)
 	case TABLE:
 		return p.parseRemoveTableStatement(explain)
 	case FIELD:
diff --git a/sql/rules.go b/sql/rules.go
new file mode 100644
index 00000000..4fde0dcf
--- /dev/null
+++ b/sql/rules.go
@@ -0,0 +1,59 @@
+// Copyright © 2016 Abcum Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sql
+
+func (p *Parser) parseDefineRulesStatement(explain bool) (stmt *DefineRulesStatement, err error) {
+
+	stmt = &DefineRulesStatement{}
+
+	stmt.EX = explain
+
+	stmt.KV = p.c.Get("KV").(string)
+	stmt.NS = p.c.Get("NS").(string)
+	stmt.DB = p.c.Get("DB").(string)
+
+	if stmt.What, err = p.parseTables(); err != nil {
+		return nil, err
+	}
+
+	if _, _, err = p.shouldBe(EOF, SEMICOLON); err != nil {
+		return nil, err
+	}
+
+	return
+
+}
+
+func (p *Parser) parseRemoveRulesStatement(explain bool) (stmt *RemoveRulesStatement, err error) {
+
+	stmt = &RemoveRulesStatement{}
+
+	stmt.EX = explain
+
+	stmt.KV = p.c.Get("KV").(string)
+	stmt.NS = p.c.Get("NS").(string)
+	stmt.DB = p.c.Get("DB").(string)
+
+	if stmt.What, err = p.parseTables(); err != nil {
+		return nil, err
+	}
+
+	if _, _, err = p.shouldBe(EOF, SEMICOLON); err != nil {
+		return nil, err
+	}
+
+	return
+
+}
diff --git a/util/item/item.go b/util/item/item.go
index 93bd3060..7a855abd 100644
--- a/util/item/item.go
+++ b/util/item/item.go
@@ -103,6 +103,16 @@ func New(kv kvs.KV, key *keys.Thing) (this *Doc) {
 }
 
 func (this *Doc) Allow(txn kvs.TX, cond string) (val bool) {
+
+	switch cond {
+	case "select":
+	case "create":
+	case "update":
+	case "modify":
+	case "delete":
+	case "relate":
+	}
+
 	return true
 }