cmp: token builder

qb/token.go

@@ -0,0 +1,114 @@
+package qb
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Token creates a new TokenBuilder.
+func Token(columns ...string) TokenBuilder {
+	return TokenBuilder(columns)
+}
+
+// TokenBuilder helps implement pagination using token function.
+type TokenBuilder []string
+
+// Eq produces token(column)=token(?).
+func (t TokenBuilder) Eq() Cmp {
+	return Cmp{
+		op:     eq,
+		fn:     "token",
+		column: fmt.Sprint("token(", strings.Join(t, ","), ")"),
+		names:  t,
+	}
+}
+
+// EqNamed produces token(column)=token(?) with a custom parameter name.
+func (t TokenBuilder) EqNamed(names ...string) Cmp {
+	return Cmp{
+		op:     eq,
+		fn:     "token",
+		column: fmt.Sprint("token(", strings.Join(t, ","), ")"),
+		names:  names,
+	}
+}
+
+// Lt produces token(column)<token(?).
+func (t TokenBuilder) Lt() Cmp {
+	return Cmp{
+		op:     lt,
+		fn:     "token",
+		column: fmt.Sprint("token(", strings.Join(t, ","), ")"),
+		names:  t,
+	}
+}
+
+// LtNamed produces token(column)<token(?) with a custom parameter name.
+func (t TokenBuilder) LtNamed(names ...string) Cmp {
+	return Cmp{
+		op:     lt,
+		fn:     "token",
+		column: fmt.Sprint("token(", strings.Join(t, ","), ")"),
+		names:  names,
+	}
+}
+
+// LtOrEq produces token(column)<=token(?).
+func (t TokenBuilder) LtOrEq() Cmp {
+	return Cmp{
+		op:     leq,
+		fn:     "token",
+		column: fmt.Sprint("token(", strings.Join(t, ","), ")"),
+		names:  t,
+	}
+}
+
+// LtOrEqNamed produces token(column)<=token(?) with a custom parameter name.
+func (t TokenBuilder) LtOrEqNamed(names ...string) Cmp {
+	return Cmp{
+		op:     leq,
+		fn:     "token",
+		column: fmt.Sprint("token(", strings.Join(t, ","), ")"),
+		names:  names,
+	}
+}
+
+// Gt produces token(column)>token(?).
+func (t TokenBuilder) Gt() Cmp {
+	return Cmp{
+		op:     gt,
+		fn:     "token",
+		column: fmt.Sprint("token(", strings.Join(t, ","), ")"),
+		names:  t,
+	}
+}
+
+// GtNamed produces token(column)>token(?) with a custom parameter name.
+func (t TokenBuilder) GtNamed(names ...string) Cmp {
+	return Cmp{
+		op:     gt,
+		fn:     "token",
+		column: fmt.Sprint("token(", strings.Join(t, ","), ")"),
+		names:  names,
+	}
+}
+
+// GtOrEq produces token(column)>=token(?).
+func (t TokenBuilder) GtOrEq() Cmp {
+	return Cmp{
+		op:     geq,
+		fn:     "token",
+		column: fmt.Sprint("token(", strings.Join(t, ","), ")"),
+		names:  t,
+	}
+}
+
+// GtOrEqNamed produces token(column)>=token(?) with a custom parameter name.
+func (t TokenBuilder) GtOrEqNamed(names ...string) Cmp {
+	return Cmp{
+		op:     geq,
+		fn:     "token",
+		column: fmt.Sprint("token(", strings.Join(t, ","), ")"),
+		names:  names,
+	}
+}