mirror of https://github.com/goccy/go-json.git
645 lines
16 KiB
Go
645 lines
16 KiB
Go
package json
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import (
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"fmt"
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"reflect"
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"strings"
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"unsafe"
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)
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func (e *Encoder) compileHead(typ *rtype, withIndent bool) (*opcode, error) {
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root := true
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switch {
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case typ.Implements(marshalJSONType):
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return newOpCode(opMarshalJSON, typ, e.indent, newEndOp(e.indent)), nil
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case rtype_ptrTo(typ).Implements(marshalJSONType):
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return newOpCode(opMarshalJSON, rtype_ptrTo(typ), e.indent, newEndOp(e.indent)), nil
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case typ.Implements(marshalTextType):
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return newOpCode(opMarshalText, typ, e.indent, newEndOp(e.indent)), nil
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case rtype_ptrTo(typ).Implements(marshalTextType):
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return newOpCode(opMarshalText, rtype_ptrTo(typ), e.indent, newEndOp(e.indent)), nil
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}
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isPtr := false
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if typ.Kind() == reflect.Ptr {
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typ = typ.Elem()
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isPtr = true
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}
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if typ.Kind() == reflect.Map {
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return e.compileMap(typ, isPtr, root, withIndent)
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} else if typ.Kind() == reflect.Struct {
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return e.compileStruct(typ, isPtr, root, withIndent)
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}
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return e.compile(typ, root, withIndent)
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}
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func (e *Encoder) compile(typ *rtype, root, withIndent bool) (*opcode, error) {
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switch {
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case typ.Implements(marshalJSONType):
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return newOpCode(opMarshalJSON, typ, e.indent, newEndOp(e.indent)), nil
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case rtype_ptrTo(typ).Implements(marshalJSONType):
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return newOpCode(opMarshalJSON, rtype_ptrTo(typ), e.indent, newEndOp(e.indent)), nil
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case typ.Implements(marshalTextType):
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return newOpCode(opMarshalText, typ, e.indent, newEndOp(e.indent)), nil
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case rtype_ptrTo(typ).Implements(marshalTextType):
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return newOpCode(opMarshalText, rtype_ptrTo(typ), e.indent, newEndOp(e.indent)), nil
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}
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switch typ.Kind() {
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case reflect.Ptr:
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return e.compilePtr(typ, root, withIndent)
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case reflect.Slice:
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return e.compileSlice(typ, root, withIndent)
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case reflect.Array:
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return e.compileArray(typ, root, withIndent)
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case reflect.Map:
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return e.compileMap(typ, true, root, withIndent)
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case reflect.Struct:
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return e.compileStruct(typ, false, root, withIndent)
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case reflect.Interface:
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return e.compileInterface(typ, root)
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case reflect.Int:
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return e.compileInt(typ)
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case reflect.Int8:
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return e.compileInt8(typ)
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case reflect.Int16:
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return e.compileInt16(typ)
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case reflect.Int32:
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return e.compileInt32(typ)
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case reflect.Int64:
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return e.compileInt64(typ)
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case reflect.Uint:
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return e.compileUint(typ)
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case reflect.Uint8:
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return e.compileUint8(typ)
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case reflect.Uint16:
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return e.compileUint16(typ)
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case reflect.Uint32:
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return e.compileUint32(typ)
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case reflect.Uint64:
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return e.compileUint64(typ)
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case reflect.Uintptr:
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return e.compileUint(typ)
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case reflect.Float32:
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return e.compileFloat32(typ)
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case reflect.Float64:
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return e.compileFloat64(typ)
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case reflect.String:
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return e.compileString(typ)
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case reflect.Bool:
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return e.compileBool(typ)
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}
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return nil, &UnsupportedTypeError{Type: rtype2type(typ)}
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}
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func (e *Encoder) optimizeStructFieldPtrHead(typ *rtype, code *opcode) *opcode {
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ptrHeadOp := code.op.headToPtrHead()
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if code.op != ptrHeadOp {
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code.op = ptrHeadOp
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return code
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}
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return newOpCode(opPtr, typ, e.indent, code)
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}
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func (e *Encoder) compilePtr(typ *rtype, root, withIndent bool) (*opcode, error) {
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code, err := e.compile(typ.Elem(), root, withIndent)
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if err != nil {
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return nil, err
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}
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return e.optimizeStructFieldPtrHead(typ, code), nil
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}
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func (e *Encoder) compileInt(typ *rtype) (*opcode, error) {
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return newOpCode(opInt, typ, e.indent, newEndOp(e.indent)), nil
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}
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func (e *Encoder) compileInt8(typ *rtype) (*opcode, error) {
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return newOpCode(opInt8, typ, e.indent, newEndOp(e.indent)), nil
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}
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func (e *Encoder) compileInt16(typ *rtype) (*opcode, error) {
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return newOpCode(opInt16, typ, e.indent, newEndOp(e.indent)), nil
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}
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func (e *Encoder) compileInt32(typ *rtype) (*opcode, error) {
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return newOpCode(opInt32, typ, e.indent, newEndOp(e.indent)), nil
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}
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func (e *Encoder) compileInt64(typ *rtype) (*opcode, error) {
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return newOpCode(opInt64, typ, e.indent, newEndOp(e.indent)), nil
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}
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func (e *Encoder) compileUint(typ *rtype) (*opcode, error) {
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return newOpCode(opUint, typ, e.indent, newEndOp(e.indent)), nil
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}
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func (e *Encoder) compileUint8(typ *rtype) (*opcode, error) {
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return newOpCode(opUint8, typ, e.indent, newEndOp(e.indent)), nil
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}
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func (e *Encoder) compileUint16(typ *rtype) (*opcode, error) {
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return newOpCode(opUint16, typ, e.indent, newEndOp(e.indent)), nil
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}
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func (e *Encoder) compileUint32(typ *rtype) (*opcode, error) {
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return newOpCode(opUint32, typ, e.indent, newEndOp(e.indent)), nil
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}
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func (e *Encoder) compileUint64(typ *rtype) (*opcode, error) {
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return newOpCode(opUint64, typ, e.indent, newEndOp(e.indent)), nil
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}
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func (e *Encoder) compileFloat32(typ *rtype) (*opcode, error) {
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return newOpCode(opFloat32, typ, e.indent, newEndOp(e.indent)), nil
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}
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func (e *Encoder) compileFloat64(typ *rtype) (*opcode, error) {
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return newOpCode(opFloat64, typ, e.indent, newEndOp(e.indent)), nil
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}
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func (e *Encoder) compileString(typ *rtype) (*opcode, error) {
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return newOpCode(opString, typ, e.indent, newEndOp(e.indent)), nil
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}
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func (e *Encoder) compileBool(typ *rtype) (*opcode, error) {
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return newOpCode(opBool, typ, e.indent, newEndOp(e.indent)), nil
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}
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func (e *Encoder) compileInterface(typ *rtype, root bool) (*opcode, error) {
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return (*opcode)(unsafe.Pointer(&interfaceCode{
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opcodeHeader: &opcodeHeader{
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op: opInterface,
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typ: typ,
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indent: e.indent,
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next: newEndOp(e.indent),
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},
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root: root,
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})), nil
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}
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func (e *Encoder) compileSlice(typ *rtype, root, withIndent bool) (*opcode, error) {
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elem := typ.Elem()
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size := elem.Size()
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e.indent++
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code, err := e.compile(elem, false, withIndent)
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e.indent--
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if err != nil {
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return nil, err
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}
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// header => opcode => elem => end
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// ^ |
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// |________|
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header := newSliceHeaderCode(e.indent)
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elemCode := &sliceElemCode{
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opcodeHeader: &opcodeHeader{
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op: opSliceElem,
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indent: e.indent,
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},
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size: size,
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}
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end := newOpCode(opSliceEnd, nil, e.indent, newEndOp(e.indent))
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if withIndent {
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if root {
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header.op = opRootSliceHeadIndent
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elemCode.op = opRootSliceElemIndent
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} else {
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header.op = opSliceHeadIndent
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elemCode.op = opSliceElemIndent
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}
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end.op = opSliceEndIndent
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}
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header.elem = elemCode
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header.end = end
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header.next = code
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code.beforeLastCode().next = (*opcode)(unsafe.Pointer(elemCode))
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elemCode.next = code
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elemCode.end = end
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return (*opcode)(unsafe.Pointer(header)), nil
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}
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func (e *Encoder) compileArray(typ *rtype, root, withIndent bool) (*opcode, error) {
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elem := typ.Elem()
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alen := typ.Len()
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size := elem.Size()
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e.indent++
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code, err := e.compile(elem, false, withIndent)
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e.indent--
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if err != nil {
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return nil, err
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}
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// header => opcode => elem => end
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// ^ |
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// |________|
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header := newArrayHeaderCode(e.indent, alen)
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elemCode := &arrayElemCode{
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opcodeHeader: &opcodeHeader{
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op: opArrayElem,
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},
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len: uintptr(alen),
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size: size,
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}
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end := newOpCode(opArrayEnd, nil, e.indent, newEndOp(e.indent))
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if withIndent {
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header.op = opArrayHeadIndent
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elemCode.op = opArrayElemIndent
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end.op = opArrayEndIndent
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}
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header.elem = elemCode
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header.end = end
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header.next = code
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code.beforeLastCode().next = (*opcode)(unsafe.Pointer(elemCode))
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elemCode.next = code
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elemCode.end = end
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return (*opcode)(unsafe.Pointer(header)), nil
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}
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//go:linkname mapiterinit reflect.mapiterinit
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//go:noescape
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func mapiterinit(mapType *rtype, m unsafe.Pointer) unsafe.Pointer
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//go:linkname mapiterkey reflect.mapiterkey
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//go:noescape
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func mapiterkey(it unsafe.Pointer) unsafe.Pointer
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//go:linkname mapiternext reflect.mapiternext
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//go:noescape
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func mapiternext(it unsafe.Pointer)
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//go:linkname maplen reflect.maplen
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//go:noescape
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func maplen(m unsafe.Pointer) int
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func (e *Encoder) compileMap(typ *rtype, withLoad, root, withIndent bool) (*opcode, error) {
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// header => code => value => code => key => code => value => code => end
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// ^ |
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// |_______________________|
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e.indent++
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keyType := typ.Key()
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keyCode, err := e.compile(keyType, false, withIndent)
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if err != nil {
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return nil, err
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}
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valueType := typ.Elem()
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valueCode, err := e.compile(valueType, false, withIndent)
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if err != nil {
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return nil, err
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}
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key := newMapKeyCode(e.indent)
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value := newMapValueCode(e.indent)
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e.indent--
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header := newMapHeaderCode(typ, withLoad, e.indent)
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header.key = key
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header.value = value
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end := newOpCode(opMapEnd, nil, e.indent, newEndOp(e.indent))
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if withIndent {
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if header.op == opMapHead {
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if root {
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header.op = opRootMapHeadIndent
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} else {
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header.op = opMapHeadIndent
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}
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} else {
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header.op = opMapHeadLoadIndent
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}
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if root {
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key.op = opRootMapKeyIndent
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} else {
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key.op = opMapKeyIndent
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}
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value.op = opMapValueIndent
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end.op = opMapEndIndent
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}
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header.next = keyCode
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keyCode.beforeLastCode().next = (*opcode)(unsafe.Pointer(value))
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value.next = valueCode
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valueCode.beforeLastCode().next = (*opcode)(unsafe.Pointer(key))
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key.next = keyCode
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header.end = end
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key.end = end
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return (*opcode)(unsafe.Pointer(header)), nil
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}
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func (e *Encoder) getTag(field reflect.StructField) string {
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return field.Tag.Get("json")
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}
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func (e *Encoder) isIgnoredStructField(field reflect.StructField) bool {
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if field.PkgPath != "" && !field.Anonymous {
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// private field
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return true
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}
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tag := e.getTag(field)
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if tag == "-" {
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return true
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}
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return false
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}
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func (e *Encoder) typeToHeaderType(op opType) opType {
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switch op {
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case opInt:
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return opStructFieldHeadInt
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case opInt8:
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return opStructFieldHeadInt8
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case opInt16:
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return opStructFieldHeadInt16
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case opInt32:
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return opStructFieldHeadInt32
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case opInt64:
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return opStructFieldHeadInt64
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case opUint:
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return opStructFieldHeadUint
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case opUint8:
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return opStructFieldHeadUint8
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case opUint16:
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return opStructFieldHeadUint16
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case opUint32:
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return opStructFieldHeadUint32
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case opUint64:
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return opStructFieldHeadUint64
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case opFloat32:
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return opStructFieldHeadFloat32
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case opFloat64:
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return opStructFieldHeadFloat64
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case opString:
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return opStructFieldHeadString
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case opBool:
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return opStructFieldHeadBool
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case opMarshalJSON:
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return opStructFieldHeadMarshalJSON
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case opMarshalText:
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return opStructFieldHeadMarshalText
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}
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return opStructFieldHead
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}
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func (e *Encoder) typeToFieldType(op opType) opType {
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switch op {
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case opInt:
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return opStructFieldInt
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case opInt8:
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return opStructFieldInt8
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case opInt16:
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return opStructFieldInt16
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case opInt32:
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return opStructFieldInt32
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case opInt64:
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return opStructFieldInt64
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case opUint:
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return opStructFieldUint
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case opUint8:
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return opStructFieldUint8
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case opUint16:
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return opStructFieldUint16
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case opUint32:
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return opStructFieldUint32
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case opUint64:
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return opStructFieldUint64
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case opFloat32:
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return opStructFieldFloat32
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case opFloat64:
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return opStructFieldFloat64
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case opString:
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return opStructFieldString
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case opBool:
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return opStructFieldBool
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case opMarshalJSON:
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return opStructFieldMarshalJSON
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case opMarshalText:
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return opStructFieldMarshalText
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}
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return opStructField
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}
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func (e *Encoder) optimizeStructHeader(op opType, isOmitEmpty, withIndent bool) opType {
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headType := e.typeToHeaderType(op)
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if isOmitEmpty {
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headType = headType.headToOmitEmptyHead()
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}
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if withIndent {
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return headType.toIndent()
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}
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return headType
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}
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func (e *Encoder) optimizeStructField(op opType, isOmitEmpty, withIndent bool) opType {
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fieldType := e.typeToFieldType(op)
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if isOmitEmpty {
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fieldType = fieldType.fieldToOmitEmptyField()
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}
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if withIndent {
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return fieldType.toIndent()
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}
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return fieldType
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}
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func (e *Encoder) recursiveCode(typ *rtype, code *compiledCode) *opcode {
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return (*opcode)(unsafe.Pointer(&recursiveCode{
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opcodeHeader: &opcodeHeader{
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op: opStructFieldRecursive,
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typ: typ,
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indent: e.indent,
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next: newEndOp(e.indent),
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},
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jmp: code,
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}))
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}
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func (e *Encoder) compiledCode(typ *rtype, withIndent bool) *opcode {
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typeptr := uintptr(unsafe.Pointer(typ))
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if withIndent {
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if compiledCode, exists := e.structTypeToCompiledIndentCode[typeptr]; exists {
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return e.recursiveCode(typ, compiledCode)
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}
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} else {
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if compiledCode, exists := e.structTypeToCompiledCode[typeptr]; exists {
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return e.recursiveCode(typ, compiledCode)
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}
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}
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return nil
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}
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func (e *Encoder) keyNameAndOmitEmptyFromField(field reflect.StructField) (string, bool) {
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keyName := field.Name
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tag := e.getTag(field)
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opts := strings.Split(tag, ",")
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if len(opts) > 0 {
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if opts[0] != "" {
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keyName = opts[0]
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}
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}
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isOmitEmpty := false
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if len(opts) > 1 {
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isOmitEmpty = opts[1] == "omitempty"
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}
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return keyName, isOmitEmpty
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}
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func (e *Encoder) structHeader(fieldCode *structFieldCode, valueCode *opcode, isOmitEmpty, withIndent bool) *opcode {
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fieldCode.indent--
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op := e.optimizeStructHeader(valueCode.op, isOmitEmpty, withIndent)
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fieldCode.op = op
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switch op {
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case opStructFieldHead,
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opStructFieldHeadOmitEmpty,
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opStructFieldHeadIndent,
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opStructFieldHeadOmitEmptyIndent:
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return valueCode.beforeLastCode()
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}
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return (*opcode)(unsafe.Pointer(fieldCode))
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}
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func (e *Encoder) structField(fieldCode *structFieldCode, valueCode *opcode, isOmitEmpty, withIndent bool) *opcode {
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code := (*opcode)(unsafe.Pointer(fieldCode))
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op := e.optimizeStructField(valueCode.op, isOmitEmpty, withIndent)
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fieldCode.op = op
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switch op {
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case opStructField,
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opStructFieldOmitEmpty,
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opStructFieldIndent,
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opStructFieldOmitEmptyIndent:
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return valueCode.beforeLastCode()
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}
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return code
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}
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func (e *Encoder) compileStruct(typ *rtype, isPtr, root, withIndent bool) (*opcode, error) {
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if code := e.compiledCode(typ, withIndent); code != nil {
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return code, nil
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}
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typeptr := uintptr(unsafe.Pointer(typ))
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|
compiled := &compiledCode{}
|
|
if withIndent {
|
|
e.structTypeToCompiledIndentCode[typeptr] = compiled
|
|
} else {
|
|
e.structTypeToCompiledCode[typeptr] = compiled
|
|
}
|
|
// header => code => structField => code => end
|
|
// ^ |
|
|
// |__________|
|
|
fieldNum := typ.NumField()
|
|
fieldIdx := 0
|
|
var (
|
|
head *structFieldCode
|
|
code *opcode
|
|
prevField *structFieldCode
|
|
)
|
|
e.indent++
|
|
for i := 0; i < fieldNum; i++ {
|
|
field := typ.Field(i)
|
|
if e.isIgnoredStructField(field) {
|
|
continue
|
|
}
|
|
keyName, isOmitEmpty := e.keyNameAndOmitEmptyFromField(field)
|
|
fieldType := type2rtype(field.Type)
|
|
if isPtr && i == 0 {
|
|
// head field of pointer structure at top level
|
|
// if field type is pointer and implements MarshalJSON or MarshalText,
|
|
// it need to operation of dereference of pointer.
|
|
if field.Type.Kind() == reflect.Ptr &&
|
|
(field.Type.Implements(marshalJSONType) || field.Type.Implements(marshalTextType)) {
|
|
fieldType = rtype_ptrTo(fieldType)
|
|
}
|
|
}
|
|
valueCode, err := e.compile(fieldType, false, withIndent)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if field.Anonymous {
|
|
f := valueCode.toStructFieldCode()
|
|
for {
|
|
f.op = f.op.headToAnonymousHead()
|
|
if f.op == opStructEnd {
|
|
f.op = opStructAnonymousEnd
|
|
}
|
|
if f.nextField == nil {
|
|
break
|
|
}
|
|
f = f.nextField.toStructFieldCode()
|
|
}
|
|
}
|
|
key := fmt.Sprintf(`"%s":`, keyName)
|
|
fieldCode := &structFieldCode{
|
|
opcodeHeader: &opcodeHeader{
|
|
typ: valueCode.typ,
|
|
next: valueCode,
|
|
indent: e.indent,
|
|
},
|
|
anonymousKey: field.Anonymous,
|
|
key: []byte(key),
|
|
offset: field.Offset,
|
|
}
|
|
if fieldIdx == 0 {
|
|
code = e.structHeader(fieldCode, valueCode, isOmitEmpty, withIndent)
|
|
head = fieldCode
|
|
prevField = fieldCode
|
|
} else {
|
|
fcode := (*opcode)(unsafe.Pointer(fieldCode))
|
|
code.next = fcode
|
|
code = e.structField(fieldCode, valueCode, isOmitEmpty, withIndent)
|
|
prevField.nextField = fcode
|
|
prevField = fieldCode
|
|
}
|
|
fieldIdx++
|
|
}
|
|
e.indent--
|
|
|
|
structEndCode := (*opcode)(unsafe.Pointer(&structFieldCode{
|
|
opcodeHeader: &opcodeHeader{
|
|
op: opStructEnd,
|
|
typ: nil,
|
|
indent: e.indent,
|
|
},
|
|
}))
|
|
structEndCode.next = newEndOp(e.indent)
|
|
if withIndent {
|
|
structEndCode.op = opStructEndIndent
|
|
}
|
|
|
|
if prevField != nil && prevField.nextField == nil {
|
|
prevField.nextField = structEndCode
|
|
}
|
|
|
|
// no struct field
|
|
if head == nil {
|
|
head = &structFieldCode{
|
|
opcodeHeader: &opcodeHeader{
|
|
op: opStructFieldHead,
|
|
typ: typ,
|
|
indent: e.indent,
|
|
},
|
|
nextField: structEndCode,
|
|
}
|
|
if withIndent {
|
|
head.op = opStructFieldHeadIndent
|
|
}
|
|
code = (*opcode)(unsafe.Pointer(head))
|
|
}
|
|
head.end = structEndCode
|
|
code.next = structEndCode
|
|
ret := (*opcode)(unsafe.Pointer(head))
|
|
compiled.code = ret
|
|
|
|
if withIndent {
|
|
delete(e.structTypeToCompiledIndentCode, typeptr)
|
|
} else {
|
|
delete(e.structTypeToCompiledCode, typeptr)
|
|
}
|
|
|
|
return ret, nil
|
|
}
|