324 lines
8.6 KiB
Go
324 lines
8.6 KiB
Go
package json
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import (
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"context"
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"io"
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"unsafe"
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"github.com/goccy/go-json/internal/encoder"
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"github.com/goccy/go-json/internal/encoder/vm"
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"github.com/goccy/go-json/internal/encoder/vm_color"
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"github.com/goccy/go-json/internal/encoder/vm_color_indent"
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"github.com/goccy/go-json/internal/encoder/vm_indent"
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)
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// An Encoder writes JSON values to an output stream.
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type Encoder struct {
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w io.Writer
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enabledIndent bool
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enabledHTMLEscape bool
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prefix string
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indentStr string
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}
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// NewEncoder returns a new encoder that writes to w.
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func NewEncoder(w io.Writer) *Encoder {
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return &Encoder{w: w, enabledHTMLEscape: true}
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}
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// Encode writes the JSON encoding of v to the stream, followed by a newline character.
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//
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// See the documentation for Marshal for details about the conversion of Go values to JSON.
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func (e *Encoder) Encode(v interface{}) error {
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return e.EncodeWithOption(v)
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}
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// EncodeWithOption call Encode with EncodeOption.
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func (e *Encoder) EncodeWithOption(v interface{}, optFuncs ...EncodeOptionFunc) error {
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ctx := encoder.TakeRuntimeContext()
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ctx.Option.Flag = 0
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err := e.encodeWithOption(ctx, v, optFuncs...)
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encoder.ReleaseRuntimeContext(ctx)
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return err
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}
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// EncodeContext call Encode with context.Context and EncodeOption.
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func (e *Encoder) EncodeContext(ctx context.Context, v interface{}, optFuncs ...EncodeOptionFunc) error {
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rctx := encoder.TakeRuntimeContext()
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rctx.Option.Flag = 0
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rctx.Option.Flag |= encoder.ContextOption
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rctx.Option.Context = ctx
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err := e.encodeWithOption(rctx, v, optFuncs...)
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encoder.ReleaseRuntimeContext(rctx)
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return err
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}
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func (e *Encoder) encodeWithOption(ctx *encoder.RuntimeContext, v interface{}, optFuncs ...EncodeOptionFunc) error {
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if e.enabledHTMLEscape {
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ctx.Option.Flag |= encoder.HTMLEscapeOption
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}
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for _, optFunc := range optFuncs {
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optFunc(ctx.Option)
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}
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var (
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buf []byte
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err error
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)
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if e.enabledIndent {
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buf, err = encodeIndent(ctx, v, e.prefix, e.indentStr)
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} else {
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buf, err = encode(ctx, v)
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}
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if err != nil {
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return err
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}
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if e.enabledIndent {
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buf = buf[:len(buf)-2]
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} else {
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buf = buf[:len(buf)-1]
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}
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buf = append(buf, '\n')
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if _, err := e.w.Write(buf); err != nil {
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return err
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}
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return nil
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}
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// SetEscapeHTML specifies whether problematic HTML characters should be escaped inside JSON quoted strings.
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// The default behavior is to escape &, <, and > to \u0026, \u003c, and \u003e to avoid certain safety problems that can arise when embedding JSON in HTML.
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//
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// In non-HTML settings where the escaping interferes with the readability of the output, SetEscapeHTML(false) disables this behavior.
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func (e *Encoder) SetEscapeHTML(on bool) {
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e.enabledHTMLEscape = on
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}
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// SetIndent instructs the encoder to format each subsequent encoded value as if indented by the package-level function Indent(dst, src, prefix, indent).
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// Calling SetIndent("", "") disables indentation.
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func (e *Encoder) SetIndent(prefix, indent string) {
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if prefix == "" && indent == "" {
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e.enabledIndent = false
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return
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}
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e.prefix = prefix
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e.indentStr = indent
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e.enabledIndent = true
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}
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func marshalContext(ctx context.Context, v interface{}, optFuncs ...EncodeOptionFunc) ([]byte, error) {
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rctx := encoder.TakeRuntimeContext()
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rctx.Option.Flag = 0
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rctx.Option.Flag = encoder.HTMLEscapeOption | encoder.ContextOption
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rctx.Option.Context = ctx
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for _, optFunc := range optFuncs {
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optFunc(rctx.Option)
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}
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buf, err := encode(rctx, v)
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if err != nil {
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encoder.ReleaseRuntimeContext(rctx)
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return nil, err
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}
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// this line exists to escape call of `runtime.makeslicecopy` .
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// if use `make([]byte, len(buf)-1)` and `copy(copied, buf)`,
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// dst buffer size and src buffer size are differrent.
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// in this case, compiler uses `runtime.makeslicecopy`, but it is slow.
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buf = buf[:len(buf)-1]
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copied := make([]byte, len(buf))
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copy(copied, buf)
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encoder.ReleaseRuntimeContext(rctx)
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return copied, nil
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}
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func marshal(v interface{}, optFuncs ...EncodeOptionFunc) ([]byte, error) {
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ctx := encoder.TakeRuntimeContext()
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ctx.Option.Flag = 0
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ctx.Option.Flag |= encoder.HTMLEscapeOption
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for _, optFunc := range optFuncs {
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optFunc(ctx.Option)
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}
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buf, err := encode(ctx, v)
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if err != nil {
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encoder.ReleaseRuntimeContext(ctx)
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return nil, err
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}
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// this line exists to escape call of `runtime.makeslicecopy` .
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// if use `make([]byte, len(buf)-1)` and `copy(copied, buf)`,
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// dst buffer size and src buffer size are differrent.
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// in this case, compiler uses `runtime.makeslicecopy`, but it is slow.
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buf = buf[:len(buf)-1]
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copied := make([]byte, len(buf))
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copy(copied, buf)
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encoder.ReleaseRuntimeContext(ctx)
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return copied, nil
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}
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func marshalNoEscape(v interface{}) ([]byte, error) {
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ctx := encoder.TakeRuntimeContext()
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ctx.Option.Flag = 0
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ctx.Option.Flag |= encoder.HTMLEscapeOption
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buf, err := encodeNoEscape(ctx, v)
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if err != nil {
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encoder.ReleaseRuntimeContext(ctx)
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return nil, err
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}
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// this line exists to escape call of `runtime.makeslicecopy` .
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// if use `make([]byte, len(buf)-1)` and `copy(copied, buf)`,
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// dst buffer size and src buffer size are differrent.
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// in this case, compiler uses `runtime.makeslicecopy`, but it is slow.
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buf = buf[:len(buf)-1]
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copied := make([]byte, len(buf))
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copy(copied, buf)
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encoder.ReleaseRuntimeContext(ctx)
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return copied, nil
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}
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func marshalIndent(v interface{}, prefix, indent string, optFuncs ...EncodeOptionFunc) ([]byte, error) {
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ctx := encoder.TakeRuntimeContext()
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ctx.Option.Flag = 0
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ctx.Option.Flag |= (encoder.HTMLEscapeOption | encoder.IndentOption)
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for _, optFunc := range optFuncs {
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optFunc(ctx.Option)
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}
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buf, err := encodeIndent(ctx, v, prefix, indent)
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if err != nil {
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encoder.ReleaseRuntimeContext(ctx)
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return nil, err
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}
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buf = buf[:len(buf)-2]
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copied := make([]byte, len(buf))
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copy(copied, buf)
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encoder.ReleaseRuntimeContext(ctx)
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return copied, nil
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}
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func encode(ctx *encoder.RuntimeContext, v interface{}) ([]byte, error) {
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b := ctx.Buf[:0]
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if v == nil {
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b = encoder.AppendNull(ctx, b)
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b = encoder.AppendComma(ctx, b)
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return b, nil
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}
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header := (*emptyInterface)(unsafe.Pointer(&v))
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typ := header.typ
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typeptr := uintptr(unsafe.Pointer(typ))
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codeSet, err := encoder.CompileToGetCodeSet(typeptr)
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if err != nil {
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return nil, err
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}
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p := uintptr(header.ptr)
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ctx.Init(p, codeSet.CodeLength)
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ctx.KeepRefs = append(ctx.KeepRefs, header.ptr)
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buf, err := encodeRunCode(ctx, b, codeSet)
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if err != nil {
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return nil, err
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}
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ctx.Buf = buf
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return buf, nil
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}
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func encodeNoEscape(ctx *encoder.RuntimeContext, v interface{}) ([]byte, error) {
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b := ctx.Buf[:0]
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if v == nil {
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b = encoder.AppendNull(ctx, b)
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b = encoder.AppendComma(ctx, b)
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return b, nil
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}
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header := (*emptyInterface)(unsafe.Pointer(&v))
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typ := header.typ
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typeptr := uintptr(unsafe.Pointer(typ))
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codeSet, err := encoder.CompileToGetCodeSet(typeptr)
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if err != nil {
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return nil, err
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}
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p := uintptr(header.ptr)
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ctx.Init(p, codeSet.CodeLength)
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buf, err := encodeRunCode(ctx, b, codeSet)
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if err != nil {
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return nil, err
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}
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ctx.Buf = buf
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return buf, nil
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}
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func encodeIndent(ctx *encoder.RuntimeContext, v interface{}, prefix, indent string) ([]byte, error) {
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b := ctx.Buf[:0]
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if v == nil {
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b = encoder.AppendNull(ctx, b)
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b = encoder.AppendCommaIndent(ctx, b)
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return b, nil
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}
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header := (*emptyInterface)(unsafe.Pointer(&v))
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typ := header.typ
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typeptr := uintptr(unsafe.Pointer(typ))
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codeSet, err := encoder.CompileToGetCodeSet(typeptr)
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if err != nil {
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return nil, err
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}
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p := uintptr(header.ptr)
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ctx.Init(p, codeSet.CodeLength)
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buf, err := encodeRunIndentCode(ctx, b, codeSet, prefix, indent)
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ctx.KeepRefs = append(ctx.KeepRefs, header.ptr)
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if err != nil {
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return nil, err
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}
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ctx.Buf = buf
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return buf, nil
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}
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func encodeRunCode(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet) ([]byte, error) {
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if (ctx.Option.Flag & encoder.DebugOption) != 0 {
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if (ctx.Option.Flag & encoder.ColorizeOption) != 0 {
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return vm_color.DebugRun(ctx, b, codeSet)
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}
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return vm.DebugRun(ctx, b, codeSet)
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}
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if (ctx.Option.Flag & encoder.ColorizeOption) != 0 {
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return vm_color.Run(ctx, b, codeSet)
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}
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return vm.Run(ctx, b, codeSet)
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}
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func encodeRunIndentCode(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, prefix, indent string) ([]byte, error) {
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ctx.Prefix = []byte(prefix)
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ctx.IndentStr = []byte(indent)
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if (ctx.Option.Flag & encoder.DebugOption) != 0 {
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if (ctx.Option.Flag & encoder.ColorizeOption) != 0 {
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return vm_color_indent.DebugRun(ctx, b, codeSet)
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}
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return vm_indent.DebugRun(ctx, b, codeSet)
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}
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if (ctx.Option.Flag & encoder.ColorizeOption) != 0 {
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return vm_color_indent.Run(ctx, b, codeSet)
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}
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return vm_indent.Run(ctx, b, codeSet)
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}
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