/
reader.go
442 lines (407 loc) · 11.7 KB
/
reader.go
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// Copyright 2017 Google LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:generate go run generate-base.go
package jsonschema
import (
"fmt"
"io/ioutil"
"strconv"
"gopkg.in/yaml.v3"
)
// This is a global map of all known Schemas.
// It is initialized when the first Schema is created and inserted.
var schemas map[string]*Schema
// NewBaseSchema builds a schema object from an embedded json representation.
func NewBaseSchema() (schema *Schema, err error) {
b, err := baseSchemaBytes()
if err != nil {
return nil, err
}
var node yaml.Node
err = yaml.Unmarshal(b, &node)
if err != nil {
return nil, err
}
return NewSchemaFromObject(&node), nil
}
// NewSchemaFromFile reads a schema from a file.
// Currently this assumes that schemas are stored in the source distribution of this project.
func NewSchemaFromFile(filename string) (schema *Schema, err error) {
file, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
var node yaml.Node
err = yaml.Unmarshal(file, &node)
if err != nil {
return nil, err
}
return NewSchemaFromObject(&node), nil
}
// NewSchemaFromObject constructs a schema from a parsed JSON object.
// Due to the complexity of the schema representation, this is a
// custom reader and not the standard Go JSON reader (encoding/json).
func NewSchemaFromObject(jsonData *yaml.Node) *Schema {
switch jsonData.Kind {
case yaml.DocumentNode:
return NewSchemaFromObject(jsonData.Content[0])
case yaml.MappingNode:
schema := &Schema{}
for i := 0; i < len(jsonData.Content); i += 2 {
k := jsonData.Content[i].Value
v := jsonData.Content[i+1]
switch k {
case "$schema":
schema.Schema = schema.stringValue(v)
case "id":
schema.ID = schema.stringValue(v)
case "multipleOf":
schema.MultipleOf = schema.numberValue(v)
case "maximum":
schema.Maximum = schema.numberValue(v)
case "exclusiveMaximum":
schema.ExclusiveMaximum = schema.boolValue(v)
case "minimum":
schema.Minimum = schema.numberValue(v)
case "exclusiveMinimum":
schema.ExclusiveMinimum = schema.boolValue(v)
case "maxLength":
schema.MaxLength = schema.intValue(v)
case "minLength":
schema.MinLength = schema.intValue(v)
case "pattern":
schema.Pattern = schema.stringValue(v)
case "additionalItems":
schema.AdditionalItems = schema.schemaOrBooleanValue(v)
case "items":
schema.Items = schema.schemaOrSchemaArrayValue(v)
case "maxItems":
schema.MaxItems = schema.intValue(v)
case "minItems":
schema.MinItems = schema.intValue(v)
case "uniqueItems":
schema.UniqueItems = schema.boolValue(v)
case "maxProperties":
schema.MaxProperties = schema.intValue(v)
case "minProperties":
schema.MinProperties = schema.intValue(v)
case "required":
schema.Required = schema.arrayOfStringsValue(v)
case "additionalProperties":
schema.AdditionalProperties = schema.schemaOrBooleanValue(v)
case "properties":
schema.Properties = schema.mapOfSchemasValue(v)
case "patternProperties":
schema.PatternProperties = schema.mapOfSchemasValue(v)
case "dependencies":
schema.Dependencies = schema.mapOfSchemasOrStringArraysValue(v)
case "enum":
schema.Enumeration = schema.arrayOfEnumValuesValue(v)
case "type":
schema.Type = schema.stringOrStringArrayValue(v)
case "allOf":
schema.AllOf = schema.arrayOfSchemasValue(v)
case "anyOf":
schema.AnyOf = schema.arrayOfSchemasValue(v)
case "oneOf":
schema.OneOf = schema.arrayOfSchemasValue(v)
case "not":
schema.Not = NewSchemaFromObject(v)
case "definitions":
schema.Definitions = schema.mapOfSchemasValue(v)
case "title":
schema.Title = schema.stringValue(v)
case "description":
schema.Description = schema.stringValue(v)
case "default":
schema.Default = v
case "format":
schema.Format = schema.stringValue(v)
case "$ref":
schema.Ref = schema.stringValue(v)
default:
fmt.Printf("UNSUPPORTED (%s)\n", k)
}
}
// insert schema in global map
if schema.ID != nil {
if schemas == nil {
schemas = make(map[string]*Schema, 0)
}
schemas[*(schema.ID)] = schema
}
return schema
default:
fmt.Printf("schemaValue: unexpected node %+v\n", jsonData)
return nil
}
return nil
}
//
// BUILDERS
// The following methods build elements of Schemas from interface{} values.
// Each returns nil if it is unable to build the desired element.
//
// Gets the string value of an interface{} value if possible.
func (schema *Schema) stringValue(v *yaml.Node) *string {
switch v.Kind {
case yaml.ScalarNode:
return &v.Value
default:
fmt.Printf("stringValue: unexpected node %+v\n", v)
}
return nil
}
// Gets the numeric value of an interface{} value if possible.
func (schema *Schema) numberValue(v *yaml.Node) *SchemaNumber {
number := &SchemaNumber{}
switch v.Kind {
case yaml.ScalarNode:
switch v.Tag {
case "!!float":
v2, _ := strconv.ParseFloat(v.Value, 64)
number.Float = &v2
return number
case "!!int":
v2, _ := strconv.ParseInt(v.Value, 10, 64)
number.Integer = &v2
return number
default:
fmt.Printf("stringValue: unexpected node %+v\n", v)
}
default:
fmt.Printf("stringValue: unexpected node %+v\n", v)
}
return nil
}
// Gets the integer value of an interface{} value if possible.
func (schema *Schema) intValue(v *yaml.Node) *int64 {
switch v.Kind {
case yaml.ScalarNode:
switch v.Tag {
case "!!float":
v2, _ := strconv.ParseFloat(v.Value, 64)
v3 := int64(v2)
return &v3
case "!!int":
v2, _ := strconv.ParseInt(v.Value, 10, 64)
return &v2
default:
fmt.Printf("intValue: unexpected node %+v\n", v)
}
default:
fmt.Printf("intValue: unexpected node %+v\n", v)
}
return nil
}
// Gets the bool value of an interface{} value if possible.
func (schema *Schema) boolValue(v *yaml.Node) *bool {
switch v.Kind {
case yaml.ScalarNode:
switch v.Tag {
case "!!bool":
v2, _ := strconv.ParseBool(v.Value)
return &v2
default:
fmt.Printf("boolValue: unexpected node %+v\n", v)
}
default:
fmt.Printf("boolValue: unexpected node %+v\n", v)
}
return nil
}
// Gets a map of Schemas from an interface{} value if possible.
func (schema *Schema) mapOfSchemasValue(v *yaml.Node) *[]*NamedSchema {
switch v.Kind {
case yaml.MappingNode:
m := make([]*NamedSchema, 0)
for i := 0; i < len(v.Content); i += 2 {
k2 := v.Content[i].Value
v2 := v.Content[i+1]
pair := &NamedSchema{Name: k2, Value: NewSchemaFromObject(v2)}
m = append(m, pair)
}
return &m
default:
fmt.Printf("mapOfSchemasValue: unexpected node %+v\n", v)
}
return nil
}
// Gets an array of Schemas from an interface{} value if possible.
func (schema *Schema) arrayOfSchemasValue(v *yaml.Node) *[]*Schema {
switch v.Kind {
case yaml.SequenceNode:
m := make([]*Schema, 0)
for _, v2 := range v.Content {
switch v2.Kind {
case yaml.MappingNode:
s := NewSchemaFromObject(v2)
m = append(m, s)
default:
fmt.Printf("arrayOfSchemasValue: unexpected node %+v\n", v2)
}
}
return &m
case yaml.MappingNode:
m := make([]*Schema, 0)
s := NewSchemaFromObject(v)
m = append(m, s)
return &m
default:
fmt.Printf("arrayOfSchemasValue: unexpected node %+v\n", v)
}
return nil
}
// Gets a Schema or an array of Schemas from an interface{} value if possible.
func (schema *Schema) schemaOrSchemaArrayValue(v *yaml.Node) *SchemaOrSchemaArray {
switch v.Kind {
case yaml.SequenceNode:
m := make([]*Schema, 0)
for _, v2 := range v.Content {
switch v2.Kind {
case yaml.MappingNode:
s := NewSchemaFromObject(v2)
m = append(m, s)
default:
fmt.Printf("schemaOrSchemaArrayValue: unexpected node %+v\n", v2)
}
}
return &SchemaOrSchemaArray{SchemaArray: &m}
case yaml.MappingNode:
s := NewSchemaFromObject(v)
return &SchemaOrSchemaArray{Schema: s}
default:
fmt.Printf("schemaOrSchemaArrayValue: unexpected node %+v\n", v)
}
return nil
}
// Gets an array of strings from an interface{} value if possible.
func (schema *Schema) arrayOfStringsValue(v *yaml.Node) *[]string {
switch v.Kind {
case yaml.ScalarNode:
a := []string{v.Value}
return &a
case yaml.SequenceNode:
a := make([]string, 0)
for _, v2 := range v.Content {
switch v2.Kind {
case yaml.ScalarNode:
a = append(a, v2.Value)
default:
fmt.Printf("arrayOfStringsValue: unexpected node %+v\n", v2)
}
}
return &a
default:
fmt.Printf("arrayOfStringsValue: unexpected node %+v\n", v)
}
return nil
}
// Gets a string or an array of strings from an interface{} value if possible.
func (schema *Schema) stringOrStringArrayValue(v *yaml.Node) *StringOrStringArray {
switch v.Kind {
case yaml.ScalarNode:
s := &StringOrStringArray{}
s.String = &v.Value
return s
case yaml.SequenceNode:
a := make([]string, 0)
for _, v2 := range v.Content {
switch v2.Kind {
case yaml.ScalarNode:
a = append(a, v2.Value)
default:
fmt.Printf("arrayOfStringsValue: unexpected node %+v\n", v2)
}
}
s := &StringOrStringArray{}
s.StringArray = &a
return s
default:
fmt.Printf("arrayOfStringsValue: unexpected node %+v\n", v)
}
return nil
}
// Gets an array of enum values from an interface{} value if possible.
func (schema *Schema) arrayOfEnumValuesValue(v *yaml.Node) *[]SchemaEnumValue {
a := make([]SchemaEnumValue, 0)
switch v.Kind {
case yaml.SequenceNode:
for _, v2 := range v.Content {
switch v2.Kind {
case yaml.ScalarNode:
switch v2.Tag {
case "!!str":
a = append(a, SchemaEnumValue{String: &v2.Value})
case "!!bool":
v3, _ := strconv.ParseBool(v2.Value)
a = append(a, SchemaEnumValue{Bool: &v3})
default:
fmt.Printf("arrayOfEnumValuesValue: unexpected type %s\n", v2.Tag)
}
default:
fmt.Printf("arrayOfEnumValuesValue: unexpected node %+v\n", v2)
}
}
default:
fmt.Printf("arrayOfEnumValuesValue: unexpected node %+v\n", v)
}
return &a
}
// Gets a map of schemas or string arrays from an interface{} value if possible.
func (schema *Schema) mapOfSchemasOrStringArraysValue(v *yaml.Node) *[]*NamedSchemaOrStringArray {
m := make([]*NamedSchemaOrStringArray, 0)
switch v.Kind {
case yaml.MappingNode:
for i := 0; i < len(v.Content); i += 2 {
k2 := v.Content[i].Value
v2 := v.Content[i+1]
switch v2.Kind {
case yaml.SequenceNode:
a := make([]string, 0)
for _, v3 := range v2.Content {
switch v3.Kind {
case yaml.ScalarNode:
a = append(a, v3.Value)
default:
fmt.Printf("mapOfSchemasOrStringArraysValue: unexpected node %+v\n", v3)
}
}
s := &SchemaOrStringArray{}
s.StringArray = &a
pair := &NamedSchemaOrStringArray{Name: k2, Value: s}
m = append(m, pair)
default:
fmt.Printf("mapOfSchemasOrStringArraysValue: unexpected node %+v\n", v2)
}
}
default:
fmt.Printf("mapOfSchemasOrStringArraysValue: unexpected node %+v\n", v)
}
return &m
}
// Gets a schema or a boolean value from an interface{} value if possible.
func (schema *Schema) schemaOrBooleanValue(v *yaml.Node) *SchemaOrBoolean {
schemaOrBoolean := &SchemaOrBoolean{}
switch v.Kind {
case yaml.ScalarNode:
v2, _ := strconv.ParseBool(v.Value)
schemaOrBoolean.Boolean = &v2
case yaml.MappingNode:
schemaOrBoolean.Schema = NewSchemaFromObject(v)
default:
fmt.Printf("schemaOrBooleanValue: unexpected node %+v\n", v)
}
return schemaOrBoolean
}