feat: Waku v2 bridge

Issue #12610

vendor/github.com/Masterminds/squirrel/case.go

@@ -0,0 +1,128 @@
+package squirrel
+
+import (
+	"bytes"
+	"errors"
+
+	"github.com/lann/builder"
+)
+
+func init() {
+	builder.Register(CaseBuilder{}, caseData{})
+}
+
+// sqlizerBuffer is a helper that allows to write many Sqlizers one by one
+// without constant checks for errors that may come from Sqlizer
+type sqlizerBuffer struct {
+	bytes.Buffer
+	args []interface{}
+	err  error
+}
+
+// WriteSql converts Sqlizer to SQL strings and writes it to buffer
+func (b *sqlizerBuffer) WriteSql(item Sqlizer) {
+	if b.err != nil {
+		return
+	}
+
+	var str string
+	var args []interface{}
+	str, args, b.err = nestedToSql(item)
+
+	if b.err != nil {
+		return
+	}
+
+	b.WriteString(str)
+	b.WriteByte(' ')
+	b.args = append(b.args, args...)
+}
+
+func (b *sqlizerBuffer) ToSql() (string, []interface{}, error) {
+	return b.String(), b.args, b.err
+}
+
+// whenPart is a helper structure to describe SQLs "WHEN ... THEN ..." expression
+type whenPart struct {
+	when Sqlizer
+	then Sqlizer
+}
+
+func newWhenPart(when interface{}, then interface{}) whenPart {
+	return whenPart{newPart(when), newPart(then)}
+}
+
+// caseData holds all the data required to build a CASE SQL construct
+type caseData struct {
+	What      Sqlizer
+	WhenParts []whenPart
+	Else      Sqlizer
+}
+
+// ToSql implements Sqlizer
+func (d *caseData) ToSql() (sqlStr string, args []interface{}, err error) {
+	if len(d.WhenParts) == 0 {
+		err = errors.New("case expression must contain at lease one WHEN clause")
+
+		return
+	}
+
+	sql := sqlizerBuffer{}
+
+	sql.WriteString("CASE ")
+	if d.What != nil {
+		sql.WriteSql(d.What)
+	}
+
+	for _, p := range d.WhenParts {
+		sql.WriteString("WHEN ")
+		sql.WriteSql(p.when)
+		sql.WriteString("THEN ")
+		sql.WriteSql(p.then)
+	}
+
+	if d.Else != nil {
+		sql.WriteString("ELSE ")
+		sql.WriteSql(d.Else)
+	}
+
+	sql.WriteString("END")
+
+	return sql.ToSql()
+}
+
+// CaseBuilder builds SQL CASE construct which could be used as parts of queries.
+type CaseBuilder builder.Builder
+
+// ToSql builds the query into a SQL string and bound args.
+func (b CaseBuilder) ToSql() (string, []interface{}, error) {
+	data := builder.GetStruct(b).(caseData)
+	return data.ToSql()
+}
+
+// MustSql builds the query into a SQL string and bound args.
+// It panics if there are any errors.
+func (b CaseBuilder) MustSql() (string, []interface{}) {
+	sql, args, err := b.ToSql()
+	if err != nil {
+		panic(err)
+	}
+	return sql, args
+}
+
+// what sets optional value for CASE construct "CASE [value] ..."
+func (b CaseBuilder) what(expr interface{}) CaseBuilder {
+	return builder.Set(b, "What", newPart(expr)).(CaseBuilder)
+}
+
+// When adds "WHEN ... THEN ..." part to CASE construct
+func (b CaseBuilder) When(when interface{}, then interface{}) CaseBuilder {
+	// TODO: performance hint: replace slice of WhenPart with just slice of parts
+	// where even indices of the slice belong to "when"s and odd indices belong to "then"s
+	return builder.Append(b, "WhenParts", newWhenPart(when, then)).(CaseBuilder)
+}
+
+// What sets optional "ELSE ..." part for CASE construct
+func (b CaseBuilder) Else(expr interface{}) CaseBuilder {
+	return builder.Set(b, "Else", newPart(expr)).(CaseBuilder)
+}