generate: Implement decoding (untested)
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d3d7b07a74
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@ -190,7 +190,7 @@ func (this *Generator) generateMessage(method uint16, message Message) (n int, e
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n += nn; if err != nil { return n, err }
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nn, err = this.println()
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("nn, err := encoder.WriteUint8(uint8(tag))\n")
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nn, err = this.iprintf("nn, err := encoder.WriteTag(tag)\n")
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n += nn; if err != nil { return n, err }
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nn, err = this.generateErrorCheck()
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n += nn; if err != nil { return n, err }
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@ -210,7 +210,12 @@ func (this *Generator) generateMessage(method uint16, message Message) (n int, e
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this.resolveMessageName(message.Name))
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n += nn; if err != nil { return n, err }
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this.push()
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// TODO this is a stub
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nn, err = this.iprintf("tag, nn, err := decoder.ReadTag()\n")
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n += nn; if err != nil { return n, err }
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nn, err = this.generateErrorCheck()
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n += nn; if err != nil { return n, err }
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nn, err = this.generateDecodeValue(message.Type, "this", "tag")
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("return n, nil\n")
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n += nn; if err != nil { return n, err }
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this.pop()
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@ -377,8 +382,10 @@ func (this *Generator) generateEncodeValue(typ Type, valueSource, tagSource stri
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n += nn; if err != nil { return n, err }
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nn, err = this.generateErrorCheck()
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n += nn; if err != nil { return n, err }
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default:
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panic(fmt.Errorf("unknown type: %T", typ))
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}
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return n, nil
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}
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@ -393,10 +400,180 @@ func (this *Generator) generateEncodeValue(typ Type, valueSource, tagSource stri
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// - err error
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// - nn int
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func (this *Generator) generateDecodeValue(typ Type, valueSource, tagSource string) (n int, err error) {
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// TODO generate stub so the code runs and we can test encoding at least+
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switch typ := typ.(type) {
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case TypeInt:
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// SI: (none)
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// LI: <value: IntN>
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if typ.Bits <= 5 {
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// SI stores the value in the tag, so we write nothing here
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break
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}
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prefix := "ReadUint"
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if typ.Signed {
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prefix = "ReadInt"
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}
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nn, err := this.iprintf("*%s, nn, err = encoder.%s%d()\n", valueSource, prefix, typ.Bits)
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n += nn; if err != nil { return n, err }
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nn, err = this.generateErrorCheck()
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n += nn; if err != nil { return n, err }
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case TypeFloat:
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// FP: <value: FloatN>
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nn, err := this.iprintf("%s, nn, err = encoder.ReadFloat%d(%s)\n", valueSource, typ.Bits)
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n += nn; if err != nil { return n, err }
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nn, err = this.generateErrorCheck()
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n += nn; if err != nil { return n, err }
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case TypeString, TypeBuffer:
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// SBA: <data: U8>*
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// LBA: <length: UN> <data: U8>*
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nn, err := this.iprintf("{\n")
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this.push()
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("var length uint64\n")
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("if %s.Is(tape.LBA) {\n", tagSource)
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n += nn; if err != nil { return n, err }
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this.push()
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nn, err = this.iprintf(
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"length, nn, err = encoder.ReadUintN(uint64(%s.CN()))\n",
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tagSource)
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n += nn; if err != nil { return n, err }
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nn, err = this.generateErrorCheck()
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n += nn; if err != nil { return n, err }
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this.pop()
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nn, err = this.iprintf("} else {\n")
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n += nn; if err != nil { return n, err }
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this.push()
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nn, err = this.iprintf("length = uint64(%s.CN())\n", tagSource)
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n += nn; if err != nil { return n, err }
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this.pop()
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nn, err = this.iprintf("}\n")
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("buffer := make([]byte, int(length))\n")
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("nn, err = encoder.Read(buffer)\n")
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n += nn; if err != nil { return n, err }
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nn, err = this.generateErrorCheck()
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n += nn; if err != nil { return n, err }
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if _, ok := typ.(TypeString); ok {
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nn, err = this.iprintf("*%s = string(buffer)\n", valueSource)
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n += nn; if err != nil { return n, err }
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} else {
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nn, err = this.iprintf("*%s = buffer\n", valueSource)
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n += nn; if err != nil { return n, err }
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}
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this.pop()
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nn, err = this.iprintf("}\n")
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n += nn; if err != nil { return n, err }
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case TypeArray:
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// OTA: <length: UN> <elementTag: tape.Tag> <values>*
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nn, err := this.iprintf("{\n")
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this.push()
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("var length uint64\n")
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf(
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"length, nn, err = encoder.ReadUintN(uint64(%s.CN()))\n",
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tagSource)
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n += nn; if err != nil { return n, err }
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nn, err = this.generateErrorCheck()
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("*%s = make(", valueSource)
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n += nn; if err != nil { return n, err }
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nn, err = this.generateType(typ)
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n += nn; if err != nil { return n, err }
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nn, err = this.printf(", int(length))\n")
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("var itemTag tape.Tag\n")
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("itemTag, nn, err = encoder.ReadTag()\n")
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n += nn; if err != nil { return n, err }
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nn, err = this.generateErrorCheck()
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("for index := range length {\n")
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n += nn; if err != nil { return n, err }
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this.push()
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nn, err = this.generateDecodeValue(
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typ.Element,
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fmt.Sprintf("(&(*%s)[index])", valueSource),
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"itemTag")
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n += nn; if err != nil { return n, err }
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this.pop()
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nn, err = this.iprintf("}\n")
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n += nn; if err != nil { return n, err }
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this.pop()
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nn, err = this.iprintf("}\n")
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n += nn; if err != nil { return n, err }
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case TypeTable:
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// KTV: <length: UN> (<key: U16> <tag: Tag> <value>)*
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nn, err := this.iprintf(
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"nn, err = tape.DecodeAny(decoder, %s, %s)\n",
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valueSource, tagSource)
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n += nn; if err != nil { return n, err }
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nn, err = this.generateErrorCheck()
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n += nn; if err != nil { return n, err }
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case TypeTableDefined:
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// KTV: <length: UN> (<key: U16> <tag: Tag> <value>)*
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nn, err := this.iprintf("{\n")
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n += nn; if err != nil { return n, err }
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this.push()
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nn, err = this.iprintf("var length uint64\n")
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf(
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"length, nn, err = encoder.ReadUintN(uint64(%s.CN()))\n",
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tagSource)
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n += nn; if err != nil { return n, err }
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nn, err = this.generateErrorCheck()
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("for _ = range length {\n")
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n += nn; if err != nil { return n, err }
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this.push()
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nn, err = this.iprintf("var key uint16\n")
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("key, nn, err = decoder.ReadUint16()\n")
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n += nn; if err != nil { return n, err }
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nn, err = this.generateErrorCheck()
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("var itemTag tape.Tag\n")
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("itemTag, nn, err = decoder.ReadTag()\n")
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n += nn; if err != nil { return n, err }
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nn, err = this.generateErrorCheck()
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n += nn; if err != nil { return n, err }
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nn, err = this.iprintf("switch key {\n")
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n += nn; if err != nil { return n, err }
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keys := slices.Collect(maps.Keys(typ.Fields))
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slices.Sort(keys)
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for _, key := range keys {
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field := typ.Fields[key]
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nn, err = this.iprintf("case 0x%04X:\n", key)
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n += nn; if err != nil { return n, err }
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this.push()
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nn, err = this.generateDecodeValue(
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field.Type,
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fmt.Sprintf("(&%s.%s)", valueSource, field.Name),
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"itemTag")
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n += nn; if err != nil { return n, err }
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this.pop()
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}
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nn, err = this.iprintf("}\n")
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n += nn; if err != nil { return n, err }
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this.pop()
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nn, err = this.iprintf("}\n")
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n += nn; if err != nil { return n, err }
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this.pop()
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nn, err = this.iprintf("}\n")
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n += nn; if err != nil { return n, err }
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case TypeNamed:
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// WHATEVER: [WHATEVER]
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nn, err := this.iprintf("nn, err = %s.DecodeValue(encoder, %s)\n", valueSource, tagSource)
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n += nn; if err != nil { return n, err }
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nn, err = this.generateErrorCheck()
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n += nn; if err != nil { return n, err }
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default:
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panic(fmt.Errorf("unknown type: %T", typ))
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}
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return 0, nil
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return n, nil
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}
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func (this *Generator) generateErrorCheck() (n int, err error) {
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@ -438,6 +615,8 @@ func (this *Generator) generateTag(typ Type, source string) (n int, err error) {
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if err != nil { return n, err }
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nn, err := this.generateTag(resolved, source)
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n += nn; if err != nil { return n, err }
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default:
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panic(fmt.Errorf("unknown type: %T", typ))
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}
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return n, nil
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