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property.go
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property.go
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package swag
import (
"errors"
"fmt"
"go/ast"
"strings"
)
// ErrFailedConvertPrimitiveType Failed to convert for swag to interpretable type
var ErrFailedConvertPrimitiveType = errors.New("swag property: failed convert primitive type")
type propertyName struct {
SchemaType string
ArrayType string
CrossPkg string
}
type propertyNewFunc func(schemeType string, crossPkg string) propertyName
func newArrayProperty(schemeType string, crossPkg string) propertyName {
return propertyName{
SchemaType: "array",
ArrayType: schemeType,
CrossPkg: crossPkg,
}
}
func newProperty(schemeType string, crossPkg string) propertyName {
return propertyName{
SchemaType: schemeType,
ArrayType: "string",
CrossPkg: crossPkg,
}
}
func convertFromSpecificToPrimitive(typeName string) (string, error) {
typeName = strings.ToUpper(typeName)
switch typeName {
case "TIME", "OBJECTID", "UUID":
return "string", nil
case "DECIMAL":
return "number", nil
}
return "", ErrFailedConvertPrimitiveType
}
func parseFieldSelectorExpr(astTypeSelectorExpr *ast.SelectorExpr, parser *Parser, propertyNewFunc propertyNewFunc) propertyName {
if primitiveType, err := convertFromSpecificToPrimitive(astTypeSelectorExpr.Sel.Name); err == nil {
return propertyNewFunc(primitiveType, "")
}
if pkgName, ok := astTypeSelectorExpr.X.(*ast.Ident); ok {
if typeDefinitions, ok := parser.TypeDefinitions[pkgName.Name][astTypeSelectorExpr.Sel.Name]; ok {
if expr, ok := typeDefinitions.Type.(*ast.SelectorExpr); ok {
if primitiveType, err := convertFromSpecificToPrimitive(expr.Sel.Name); err == nil {
return propertyNewFunc(primitiveType, "")
}
}
parser.ParseDefinition(pkgName.Name, astTypeSelectorExpr.Sel.Name, typeDefinitions)
return propertyNewFunc(astTypeSelectorExpr.Sel.Name, pkgName.Name)
}
if actualPrimitiveType, isCustomType := parser.CustomPrimitiveTypes[astTypeSelectorExpr.Sel.Name]; isCustomType {
return propertyName{SchemaType: actualPrimitiveType, ArrayType: actualPrimitiveType}
}
}
return propertyName{SchemaType: "string", ArrayType: "string"}
}
// getPropertyName returns the string value for the given field if it exists
// allowedValues: array, boolean, integer, null, number, object, string
func getPropertyName(expr ast.Expr, parser *Parser) (propertyName, error) {
if astTypeSelectorExpr, ok := expr.(*ast.SelectorExpr); ok {
return parseFieldSelectorExpr(astTypeSelectorExpr, parser, newProperty), nil
}
// check if it is a custom type
typeName := fmt.Sprintf("%v", expr)
if actualPrimitiveType, isCustomType := parser.CustomPrimitiveTypes[typeName]; isCustomType {
return propertyName{SchemaType: actualPrimitiveType, ArrayType: actualPrimitiveType}, nil
}
if astTypeIdent, ok := expr.(*ast.Ident); ok {
name := astTypeIdent.Name
schemeType := TransToValidSchemeType(name)
return propertyName{SchemaType: schemeType, ArrayType: schemeType}, nil
}
if ptr, ok := expr.(*ast.StarExpr); ok {
return getPropertyName(ptr.X, parser)
}
if astTypeArray, ok := expr.(*ast.ArrayType); ok { // if array
return getArrayPropertyName(astTypeArray, parser), nil
}
if _, ok := expr.(*ast.MapType); ok { // if map
return propertyName{SchemaType: "object", ArrayType: "object"}, nil
}
if _, ok := expr.(*ast.StructType); ok { // if struct
return propertyName{SchemaType: "object", ArrayType: "object"}, nil
}
if _, ok := expr.(*ast.InterfaceType); ok { // if interface{}
return propertyName{SchemaType: "object", ArrayType: "object"}, nil
}
return propertyName{}, errors.New("not supported" + fmt.Sprint(expr))
}
func getArrayPropertyName(astTypeArray *ast.ArrayType, parser *Parser) propertyName {
if astTypeArrayExpr, ok := astTypeArray.Elt.(*ast.SelectorExpr); ok {
return parseFieldSelectorExpr(astTypeArrayExpr, parser, newArrayProperty)
}
if astTypeArrayExpr, ok := astTypeArray.Elt.(*ast.StarExpr); ok {
if astTypeArraySel, ok := astTypeArrayExpr.X.(*ast.SelectorExpr); ok {
return parseFieldSelectorExpr(astTypeArraySel, parser, newArrayProperty)
}
if astTypeArrayIdent, ok := astTypeArrayExpr.X.(*ast.Ident); ok {
name := TransToValidSchemeType(astTypeArrayIdent.Name)
return propertyName{SchemaType: "array", ArrayType: name}
}
}
itemTypeName := TransToValidSchemeType(fmt.Sprintf("%s", astTypeArray.Elt))
if actualPrimitiveType, isCustomType := parser.CustomPrimitiveTypes[itemTypeName]; isCustomType {
itemTypeName = actualPrimitiveType
}
return propertyName{SchemaType: "array", ArrayType: itemTypeName}
}