428 lines
9.8 KiB
Go
428 lines
9.8 KiB
Go
package main
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/*
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translation.go provides a 'Translate' method on every XML type that converts
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the XML type into our "better" representation.
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i.e., the representation of Fields and Expressions is just too general.
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We end up losing a lot of the advantages of static typing if we keep
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the types that encoding/xml forces us into.
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Please see 'representation.go' for the type definitions that we're
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translating to.
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*/
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import (
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"log"
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"strconv"
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"strings"
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)
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func (xml *XML) Translate(parent *Protocol) *Protocol {
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protocol := &Protocol{
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Parent: parent,
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Name: xml.Header,
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ExtXName: xml.ExtensionXName,
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ExtName: xml.ExtensionName,
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MajorVersion: xml.MajorVersion,
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MinorVersion: xml.MinorVersion,
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Imports: make([]*Protocol, 0),
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Types: make([]Type, 0),
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Requests: make([]*Request, len(xml.Requests)),
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}
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for _, imp := range xml.Imports {
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if imp.xml != nil {
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protocol.Imports = append(protocol.Imports,
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imp.xml.Translate(protocol))
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}
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}
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for xmlName, srcName := range BaseTypeMap {
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newBaseType := &Base{
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srcName: srcName,
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xmlName: xmlName,
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size: newFixedSize(BaseTypeSizes[xmlName], true),
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}
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protocol.Types = append(protocol.Types, newBaseType)
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}
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for _, enum := range xml.Enums {
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protocol.Types = append(protocol.Types, enum.Translate())
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}
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for _, xid := range xml.Xids {
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protocol.Types = append(protocol.Types, xid.Translate())
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}
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for _, xidunion := range xml.XidUnions {
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protocol.Types = append(protocol.Types, xidunion.Translate())
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}
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for _, typedef := range xml.TypeDefs {
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protocol.Types = append(protocol.Types, typedef.Translate())
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}
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for _, s := range xml.Structs {
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protocol.Types = append(protocol.Types, s.Translate())
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}
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for _, union := range xml.Unions {
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protocol.Types = append(protocol.Types, union.Translate())
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}
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for _, ev := range xml.Events {
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protocol.Types = append(protocol.Types, ev.Translate())
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}
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for _, evcopy := range xml.EventCopies {
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protocol.Types = append(protocol.Types, evcopy.Translate())
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}
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for _, err := range xml.Errors {
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protocol.Types = append(protocol.Types, err.Translate())
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}
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for _, errcopy := range xml.ErrorCopies {
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protocol.Types = append(protocol.Types, errcopy.Translate())
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}
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for i, request := range xml.Requests {
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protocol.Requests[i] = request.Translate()
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}
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// Now load all of the type and source name information.
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protocol.Initialize()
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// Make sure all enums have concrete values.
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for _, typ := range protocol.Types {
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enum, ok := typ.(*Enum)
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if !ok {
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continue
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}
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nextValue := 0
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for _, item := range enum.Items {
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if item.Expr == nil {
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item.Expr = &Value{v: nextValue}
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nextValue++
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} else {
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nextValue = item.Expr.Eval() + 1
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}
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}
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}
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return protocol
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}
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func (x *XMLEnum) Translate() *Enum {
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enum := &Enum{
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xmlName: x.Name,
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Items: make([]*EnumItem, len(x.Items)),
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}
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for i, item := range x.Items {
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enum.Items[i] = &EnumItem{
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xmlName: item.Name,
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Expr: item.Expr.Translate(),
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}
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}
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return enum
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}
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func (x *XMLXid) Translate() *Resource {
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return &Resource{
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xmlName: x.Name,
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}
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}
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func (x *XMLTypeDef) Translate() *TypeDef {
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return &TypeDef{
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xmlName: x.New,
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Old: newTranslation(x.Old),
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}
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}
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func (x *XMLEvent) Translate() *Event {
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ev := &Event{
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xmlName: x.Name,
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Number: x.Number,
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NoSequence: x.NoSequence,
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Fields: make([]Field, 0, len(x.Fields)),
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}
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for _, field := range x.Fields {
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if field.XMLName.Local == "doc" {
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continue
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}
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ev.Fields = append(ev.Fields, field.Translate(ev))
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}
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return ev
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}
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func (x *XMLEventCopy) Translate() *EventCopy {
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return &EventCopy{
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xmlName: x.Name,
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Number: x.Number,
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Old: newTranslation(x.Ref),
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}
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}
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func (x *XMLError) Translate() *Error {
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err := &Error{
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xmlName: x.Name,
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Number: x.Number,
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Fields: make([]Field, len(x.Fields)),
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}
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for i, field := range x.Fields {
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err.Fields[i] = field.Translate(err)
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}
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return err
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}
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func (x *XMLErrorCopy) Translate() *ErrorCopy {
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return &ErrorCopy{
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xmlName: x.Name,
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Number: x.Number,
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Old: newTranslation(x.Ref),
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}
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}
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func (x *XMLStruct) Translate() *Struct {
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s := &Struct{
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xmlName: x.Name,
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Fields: make([]Field, len(x.Fields)),
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}
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for i, field := range x.Fields {
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s.Fields[i] = field.Translate(s)
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}
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return s
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}
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func (x *XMLUnion) Translate() *Union {
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u := &Union{
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xmlName: x.Name,
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Fields: make([]Field, len(x.Fields)),
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}
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for i, field := range x.Fields {
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u.Fields[i] = field.Translate(u)
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}
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return u
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}
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func (x *XMLRequest) Translate() *Request {
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r := &Request{
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xmlName: x.Name,
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Opcode: x.Opcode,
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Combine: x.Combine,
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Fields: make([]Field, 0, len(x.Fields)),
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Reply: x.Reply.Translate(),
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}
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for _, field := range x.Fields {
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if field.XMLName.Local == "doc" || field.XMLName.Local == "fd" {
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continue
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}
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r.Fields = append(r.Fields, field.Translate(r))
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}
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// Address bug (or legacy code) in QueryTextExtents.
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// The XML protocol description references 'string_len' in the
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// computation of the 'odd_length' field. However, 'string_len' is not
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// defined. Therefore, let's forcefully add it as a 'local field'.
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// (i.e., a parameter in the caller but does not get sent over the wire.)
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if x.Name == "QueryTextExtents" {
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stringLenLocal := &LocalField{&SingleField{
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xmlName: "string_len",
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Type: newTranslation("CARD16"),
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}}
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r.Fields = append(r.Fields, stringLenLocal)
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}
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return r
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}
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func (x *XMLReply) Translate() *Reply {
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if x == nil {
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return nil
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}
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r := &Reply{
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Fields: make([]Field, 0, len(x.Fields)),
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}
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for _, field := range x.Fields {
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if field.XMLName.Local == "doc" || field.XMLName.Local == "fd" {
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continue
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}
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r.Fields = append(r.Fields, field.Translate(r))
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}
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return r
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}
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func (x *XMLExpression) Translate() Expression {
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if x == nil {
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return nil
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}
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switch x.XMLName.Local {
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case "op":
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if len(x.Exprs) != 2 {
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log.Panicf("'op' found %d expressions; expected 2.", len(x.Exprs))
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}
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return &BinaryOp{
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Op: x.Op,
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Expr1: x.Exprs[0].Translate(),
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Expr2: x.Exprs[1].Translate(),
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}
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case "unop":
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if len(x.Exprs) != 1 {
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log.Panicf("'unop' found %d expressions; expected 1.", len(x.Exprs))
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}
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return &UnaryOp{
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Op: x.Op,
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Expr: x.Exprs[0].Translate(),
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}
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case "popcount":
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if len(x.Exprs) != 1 {
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log.Panicf("'popcount' found %d expressions; expected 1.",
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len(x.Exprs))
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}
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return &PopCount{
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Expr: x.Exprs[0].Translate(),
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}
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case "value":
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val, err := strconv.Atoi(strings.TrimSpace(x.Data))
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if err != nil {
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log.Panicf("Could not convert '%s' in 'value' expression to int.",
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x.Data)
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}
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return &Value{
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v: val,
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}
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case "bit":
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bit, err := strconv.Atoi(strings.TrimSpace(x.Data))
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if err != nil {
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log.Panicf("Could not convert '%s' in 'bit' expression to int.",
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x.Data)
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}
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if bit < 0 || bit > 31 {
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log.Panicf("A 'bit' literal must be in the range [0, 31], but "+
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" is %d", bit)
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}
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return &Bit{
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b: bit,
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}
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case "fieldref":
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return &FieldRef{
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Name: x.Data,
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}
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case "enumref":
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return &EnumRef{
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EnumKind: newTranslation(x.Ref),
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EnumItem: x.Data,
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}
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case "sumof":
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return &SumOf{
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Name: x.Ref,
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}
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}
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log.Panicf("Unrecognized tag '%s' in expression context. Expected one of "+
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"op, fieldref, value, bit, enumref, unop, sumof or popcount.",
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x.XMLName.Local)
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panic("unreachable")
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}
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func (x *XMLField) Translate(parent interface{}) Field {
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switch x.XMLName.Local {
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case "pad":
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return &PadField{
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Bytes: x.Bytes,
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Align: x.Align,
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}
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case "field":
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s := &SingleField{
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xmlName: x.Name,
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Type: newTranslation(x.Type),
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}
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return s
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case "list":
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return &ListField{
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xmlName: x.Name,
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Type: newTranslation(x.Type),
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LengthExpr: x.Expr.Translate(),
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}
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case "localfield":
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return &LocalField{&SingleField{
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xmlName: x.Name,
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Type: newTranslation(x.Type),
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}}
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case "exprfield":
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return &ExprField{
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xmlName: x.Name,
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Type: newTranslation(x.Type),
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Expr: x.Expr.Translate(),
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}
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case "valueparam":
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return &ValueField{
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Parent: parent,
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MaskType: newTranslation(x.ValueMaskType),
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MaskName: x.ValueMaskName,
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ListName: x.ValueListName,
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}
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case "switch":
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swtch := &SwitchField{
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Name: x.Name,
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Expr: x.Expr.Translate(),
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Bitcases: make([]*Bitcase, len(x.Bitcases)),
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}
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for i, bitcase := range x.Bitcases {
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swtch.Bitcases[i] = bitcase.Translate()
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}
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return swtch
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case "required_start_align":
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return &RequiredStartAlign{}
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}
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log.Panicf("Unrecognized field element: %s", x.XMLName.Local)
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panic("unreachable")
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}
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func (x *XMLBitcase) Translate() *Bitcase {
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b := &Bitcase{
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Expr: x.Expr().Translate(),
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Fields: make([]Field, len(x.Fields)),
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}
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for i, field := range x.Fields {
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b.Fields[i] = field.Translate(b)
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}
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return b
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}
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// SrcName is used to translate any identifier into a Go name.
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// Mostly used for fields, but used in a couple other places too (enum items).
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func SrcName(p *Protocol, name string) string {
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// If it's in the name map, use that translation.
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if newn, ok := NameMap[name]; ok {
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return newn
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}
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return splitAndTitle(name)
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}
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func TypeSrcName(p *Protocol, typ Type) string {
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t := typ.XmlName()
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// If this is a base type, then write the raw Go type.
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if baseType, ok := typ.(*Base); ok {
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return baseType.SrcName()
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}
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// If it's in the type map, use that translation.
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if newt, ok := TypeMap[t]; ok {
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return newt
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}
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// If there's a namespace to this type, just use it and be done.
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if colon := strings.Index(t, ":"); colon > -1 {
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namespace := t[:colon]
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rest := t[colon+1:]
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return p.ProtocolFind(namespace).PkgName() + "." + splitAndTitle(rest)
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}
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// Since there's no namespace, we're left with the raw type name.
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// If the type is part of the source we're generating (i.e., there is
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// no parent protocol), then just return that type name.
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// Otherwise, we must qualify it with a package name.
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if p.Parent == nil {
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return splitAndTitle(t)
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}
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return p.PkgName() + "." + splitAndTitle(t)
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}
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