Integrate public as bindata optionally (#293)

* Dropped unused codekit config

* Integrated dynamic and static bindata for public

* Ignore public bindata

* Add a general generate make task

* Integrated flexible public assets into web command

* Updated vendoring, added all missiong govendor deps

* Made the linter happy with the bindata and dynamic code

* Moved public bindata definition to modules directory

* Ignoring the new bindata path now

* Updated to the new public modules import path

* Updated public bindata command and drop the new prefix

vendor/github.com/pingcap/tidb/evaluator/helper.go

@@ -0,0 +1,136 @@
+package evaluator
+
+import (
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/juju/errors"
+	"github.com/pingcap/tidb/ast"
+	"github.com/pingcap/tidb/context"
+	"github.com/pingcap/tidb/mysql"
+	"github.com/pingcap/tidb/sessionctx/variable"
+	"github.com/pingcap/tidb/util/types"
+)
+
+var (
+	// CurrentTimestamp is the keyword getting default value for datetime and timestamp type.
+	CurrentTimestamp  = "CURRENT_TIMESTAMP"
+	currentTimestampL = "current_timestamp"
+	// ZeroTimestamp shows the zero datetime and timestamp.
+	ZeroTimestamp = "0000-00-00 00:00:00"
+)
+
+var (
+	errDefaultValue = errors.New("invalid default value")
+)
+
+// GetTimeValue gets the time value with type tp.
+func GetTimeValue(ctx context.Context, v interface{}, tp byte, fsp int) (interface{}, error) {
+	return getTimeValue(ctx, v, tp, fsp)
+}
+
+func getTimeValue(ctx context.Context, v interface{}, tp byte, fsp int) (interface{}, error) {
+	value := mysql.Time{
+		Type: tp,
+		Fsp:  fsp,
+	}
+
+	defaultTime, err := getSystemTimestamp(ctx)
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+
+	switch x := v.(type) {
+	case string:
+		upperX := strings.ToUpper(x)
+		if upperX == CurrentTimestamp {
+			value.Time = defaultTime
+		} else if upperX == ZeroTimestamp {
+			value, _ = mysql.ParseTimeFromNum(0, tp, fsp)
+		} else {
+			value, err = mysql.ParseTime(x, tp, fsp)
+			if err != nil {
+				return nil, errors.Trace(err)
+			}
+		}
+	case *ast.ValueExpr:
+		switch x.Kind() {
+		case types.KindString:
+			value, err = mysql.ParseTime(x.GetString(), tp, fsp)
+			if err != nil {
+				return nil, errors.Trace(err)
+			}
+		case types.KindInt64:
+			value, err = mysql.ParseTimeFromNum(x.GetInt64(), tp, fsp)
+			if err != nil {
+				return nil, errors.Trace(err)
+			}
+		case types.KindNull:
+			return nil, nil
+		default:
+			return nil, errors.Trace(errDefaultValue)
+		}
+	case *ast.FuncCallExpr:
+		if x.FnName.L == currentTimestampL {
+			return CurrentTimestamp, nil
+		}
+		return nil, errors.Trace(errDefaultValue)
+	case *ast.UnaryOperationExpr:
+		// support some expression, like `-1`
+		v, err := Eval(ctx, x)
+		if err != nil {
+			return nil, errors.Trace(err)
+		}
+		ft := types.NewFieldType(mysql.TypeLonglong)
+		xval, err := types.Convert(v, ft)
+		if err != nil {
+			return nil, errors.Trace(err)
+		}
+
+		value, err = mysql.ParseTimeFromNum(xval.(int64), tp, fsp)
+		if err != nil {
+			return nil, errors.Trace(err)
+		}
+	default:
+		return nil, nil
+	}
+
+	return value, nil
+}
+
+// IsCurrentTimeExpr returns whether e is CurrentTimeExpr.
+func IsCurrentTimeExpr(e ast.ExprNode) bool {
+	x, ok := e.(*ast.FuncCallExpr)
+	if !ok {
+		return false
+	}
+	return x.FnName.L == currentTimestampL
+}
+
+func getSystemTimestamp(ctx context.Context) (time.Time, error) {
+	value := time.Now()
+
+	if ctx == nil {
+		return value, nil
+	}
+
+	// check whether use timestamp varibale
+	sessionVars := variable.GetSessionVars(ctx)
+	if v, ok := sessionVars.Systems["timestamp"]; ok {
+		if v != "" {
+			timestamp, err := strconv.ParseInt(v, 10, 64)
+			if err != nil {
+				return time.Time{}, errors.Trace(err)
+			}
+
+			if timestamp <= 0 {
+				return value, nil
+			}
+
+			return time.Unix(timestamp, 0), nil
+		}
+	}
+
+	return value, nil
+}