forked from go-jet/jet
/
dialect.go
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/
dialect.go
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package jet
import "strings"
// Dialect interface
type Dialect interface {
Name() string
PackageName() string
OperatorSerializeOverride(operator string) SerializeOverride
FunctionSerializeOverride(function string) SerializeOverride
AliasQuoteChar() byte
IdentifierQuoteChar() byte
ArgumentPlaceholder() QueryPlaceholderFunc
IsReservedWord(name string) bool
}
// SerializerFunc func
type SerializerFunc func(statement StatementType, out *SQLBuilder, options ...SerializeOption)
// SerializeOverride func
type SerializeOverride func(expressions ...Serializer) SerializerFunc
// QueryPlaceholderFunc func
type QueryPlaceholderFunc func(ord int) string
// DialectParams struct
type DialectParams struct {
Name string
PackageName string
OperatorSerializeOverrides map[string]SerializeOverride
FunctionSerializeOverrides map[string]SerializeOverride
AliasQuoteChar byte
IdentifierQuoteChar byte
ArgumentPlaceholder QueryPlaceholderFunc
ReservedWords []string
}
// NewDialect creates new dialect with params
func NewDialect(params DialectParams) Dialect {
return &dialectImpl{
name: params.Name,
packageName: params.PackageName,
operatorSerializeOverrides: params.OperatorSerializeOverrides,
functionSerializeOverrides: params.FunctionSerializeOverrides,
aliasQuoteChar: params.AliasQuoteChar,
identifierQuoteChar: params.IdentifierQuoteChar,
argumentPlaceholder: params.ArgumentPlaceholder,
reservedWords: arrayOfStringsToMapOfStrings(params.ReservedWords),
}
}
type dialectImpl struct {
name string
packageName string
operatorSerializeOverrides map[string]SerializeOverride
functionSerializeOverrides map[string]SerializeOverride
aliasQuoteChar byte
identifierQuoteChar byte
argumentPlaceholder QueryPlaceholderFunc
reservedWords map[string]bool
supportsReturning bool
}
func (d *dialectImpl) Name() string {
return d.name
}
func (d *dialectImpl) PackageName() string {
return d.packageName
}
func (d *dialectImpl) OperatorSerializeOverride(operator string) SerializeOverride {
if d.operatorSerializeOverrides == nil {
return nil
}
return d.operatorSerializeOverrides[operator]
}
func (d *dialectImpl) FunctionSerializeOverride(function string) SerializeOverride {
if d.functionSerializeOverrides == nil {
return nil
}
return d.functionSerializeOverrides[function]
}
func (d *dialectImpl) AliasQuoteChar() byte {
return d.aliasQuoteChar
}
func (d *dialectImpl) IdentifierQuoteChar() byte {
return d.identifierQuoteChar
}
func (d *dialectImpl) ArgumentPlaceholder() QueryPlaceholderFunc {
return d.argumentPlaceholder
}
func (d *dialectImpl) IsReservedWord(name string) bool {
_, isReservedWord := d.reservedWords[strings.ToLower(name)]
return isReservedWord
}
func arrayOfStringsToMapOfStrings(arr []string) map[string]bool {
ret := map[string]bool{}
for _, elem := range arr {
ret[strings.ToLower(elem)] = true
}
return ret
}