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progress. still not working. this is incredibly difficult.

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This commit is contained in:
Andrew Gallant (Ocelot)
2012-04-29 03:38:29 -04:00
parent 52a21b415a
commit 6bf0191fb0
10 changed files with 385 additions and 80 deletions
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291
nexgb/xgbgen/go.go
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@@ -8,12 +8,22 @@ package main
* Imports and helper variables.
* Manual type and name override maps.
* Constants for tweaking various morphing functions.
* Helper morphing functions.
* Morphing functions for each "sub-unit."
* Morphing functions for each "unit".
* Morphing functions for collections of "units".
Units can be thought of as the top-level elements in an XML protocol
description file. Namely, structs, xidtypes, imports, enums, unions, etc.
Collections of units are simply "all of the UNIT in the XML file."
Sub-units can be thought of as recurring bits like struct contents (which
is used in events, replies, requests, errors, etc.) and expression
evaluation.
*/
import (
"log"
"strings"
)
@@ -38,6 +48,24 @@ var BaseTypeMap = map[string]string{
"BOOL": "bool",
"float": "float64",
"double": "float64",
"char": "byte",
}
// BaseTypeSizes should have precisely the same keys as in BaseTypeMap,
// and the values should correspond to the size of the type in bytes.
var BaseTypeSizes = map[string]uint{
"CARD8": 1,
"CARD16": 2,
"CARD32": 4,
"INT8": 1,
"INT16": 2,
"INT32": 4,
"BYTE": 1,
"BOOL": 1,
"float": 4,
"double": 8,
"char": 1,
"Id": 4,
}
// TypeMap is a map from types in the XML to type names that is used
@@ -54,12 +82,26 @@ var TypeMap = map[string]string{
var NameMap = map[string]string{ }
/******************************************************************************/
// Helper functions that aide in morphing repetive constructs.
// i.e., "structure contents", expressions, type and identifier names, etc.
// Constants for changing the semantics of morphing functions.
// These are mainly used to tweaking the writing of fields.
// Namely, reading/writing is not exactly the same across events,
// requests/replies and errors.
/******************************************************************************/
const (
FieldsEvent = iota
FieldsRequestReply
FieldsError
)
/******************************************************************************/
// Helper functions that aide in morphing repetitive constructs.
// i.e., type and identifier names, etc.
/******************************************************************************/
// Morph changes every TYPE (not names) into something suitable
// for your language.
// for your language. It also handles adding suffixes like 'Event'
// and 'Union'. (A 'Union' suffix is used in Go because unions aren't
// supported at the language level.)
func (typ Type) Morph(c *Context) string {
t := string(typ)
@@ -87,7 +129,33 @@ func (typ Type) Morph(c *Context) string {
// Since there is no namespace, we need to look for a namespace
// in the current context.
return c.TypePrefix(typ) + splitAndTitle(t)
return typ.Prefix(c) + splitAndTitle(t)
}
// Prefix searches the parsed XML for a type matching 'typ'.
// It then returns the appropriate prefix to be used in source code.
// Note that the core X protocol *is* a namespace, but does not have a prefix.
// Also note that you should probably check the BaseTypeMap and TypeMap
// before calling this function.
func (typ Type) Prefix(c *Context) string {
// If this is xproto, quit. No prefixes needed.
if c.xml.Header == "xproto" {
return ""
}
// First check for the type in the current namespace.
if c.xml.HasType(typ) {
return strings.Title(c.xml.Header)
}
// Now check each of the imports...
for _, imp := range c.xml.Imports {
if imp.xml.Header != "xproto" && imp.xml.HasType(typ) {
return strings.Title(imp.xml.Header)
}
}
return ""
}
// Morph changes every identifier (NOT type) into something suitable
@@ -103,6 +171,147 @@ func (name Name) Morph(c *Context) string {
return splitAndTitle(n)
}
/******************************************************************************/
// Sub-unit morphing.
// Below are functions that morph sub-units. Like collections of fields,
// expressions, etc.
// Note that collections of fields can be used in three different contexts:
// definitions, reading from the wire and writing to the wire. Thus, there
// exists 'MorphDefine', 'MorphRead', 'MorphWrite' defined on Fields.
/******************************************************************************/
func (fields Fields) MorphDefine(c *Context) {
for _, field := range fields {
field.MorphDefine(c)
}
}
func (field *Field) MorphDefine(c *Context) {
// We omit 'pad' and 'exprfield'
switch field.XMLName.Local {
case "field":
c.Putln("%s %s", field.Name.Morph(c), field.Type.Morph(c))
case "list":
c.Putln("%s []%s", field.Name.Morph(c), field.Type.Morph(c))
case "localfield":
c.Putln("%s %s", field.Name.Morph(c), field.Type.Morph(c))
case "valueparam":
c.Putln("%s %s", field.ValueMaskName.Morph(c),
field.ValueMaskType.Morph(c))
c.Putln("%s []%s", field.ValueListName.Morph(c),
field.ValueMaskType.Morph(c))
case "switch":
field.Bitcases.MorphDefine(c)
}
}
func (bitcases Bitcases) MorphDefine(c *Context) {
for _, bitcase := range bitcases {
bitcase.MorphDefine(c)
}
}
func (bitcase *Bitcase) MorphDefine(c *Context) {
bitcase.Fields.MorphDefine(c)
}
func (fields Fields) MorphRead(c *Context, kind int, evNoSeq bool) {
var nextByte uint
switch kind {
case FieldsEvent:
nextByte = 1
}
for _, field := range fields {
nextByte = field.MorphRead(c, kind, nextByte)
switch kind {
case FieldsEvent:
// Skip the sequence id
if !evNoSeq && (nextByte == 2 || nextByte == 3) {
nextByte = 4
}
}
}
}
func (field *Field) MorphRead(c *Context, kind int, byt uint) uint {
consumed := uint(0)
switch field.XMLName.Local {
case "pad":
consumed = uint(field.Bytes)
case "field":
if field.Type == "ClientMessageData" {
break
}
size := field.Type.Size(c)
typ := field.Type.Morph(c)
name := field.Name.Morph(c)
_, isBase := BaseTypeMap[string(field.Type)]
c.Put("v.%s = ", name)
if !isBase {
c.Put("%s(", typ)
}
switch size {
case 1: c.Put("buf[%d]", byt)
case 2: c.Put("get16(buf[%d:])", byt)
case 4: c.Put("get32(buf[%d:])", byt)
case 8: c.Put("get64(buf[%d:])", byt)
default:
log.Fatalf("Unsupported field size '%d' for field '%s'.",
size, field)
}
if !isBase {
c.Put(")")
}
c.Putln("")
consumed = size
case "list":
c.Putln("")
}
return byt + consumed
}
func (fields Fields) MorphWrite(c *Context, kind int) {
var nextByte uint
switch kind {
case FieldsEvent:
nextByte = 1
}
for _, field := range fields {
nextByte = field.MorphWrite(c, kind, nextByte)
}
}
func (field *Field) MorphWrite(c *Context, kind int, byt uint) uint {
consumed := uint(0)
switch field.XMLName.Local {
case "pad":
consumed = uint(field.Bytes)
case "field":
size := field.Type.Size(c)
typ := field.Type.Morph(c)
name := field.Name.Morph(c)
switch size {
case 1:
c.Putln("v.%s = %s(buf[%d])", name, typ, byt)
case 2:
c.Putln("v.%s = %s(get16(buf[%d:]))", name, typ, byt)
case 4:
c.Putln("v.%s = %s(get32(buf[%d:]))", name, typ, byt)
case 8:
c.Putln("v.%s = %s(get64(buf[%d:]))", name, typ, byt)
}
consumed = size
case "list":
c.Putln("IDK")
}
return byt + consumed
}
/******************************************************************************/
// Per element morphing.
// Below are functions that morph a single unit.
@@ -133,15 +342,23 @@ func (xid *Xid) Morph(c *Context) {
// TypeDef morphing.
func (typedef *TypeDef) Morph(c *Context) {
c.Putln("type %s %s", typedef.Old.Morph(c), typedef.New.Morph(c))
c.Putln("type %s %s", typedef.New.Morph(c), typedef.Old.Morph(c))
}
// Struct morphing.
func (strct *Struct) Morph(c *Context) {
c.Putln("type %s struct {", strct.Name.Morph(c))
strct.Fields.MorphDefine(c)
c.Putln("}")
c.Putln("\n")
}
// Union morphing.
func (union *Union) Morph(c *Context) {
c.Putln("type %s struct {", union.Name.Morph(c))
union.Fields.MorphDefine(c)
c.Putln("}")
c.Putln("\n")
}
// Request morphing.
@@ -150,10 +367,54 @@ func (request *Request) Morph(c *Context) {
// Event morphing.
func (ev *Event) Morph(c *Context) {
name := ev.Name.Morph(c)
c.Putln("const %s = %d", name, ev.Number)
c.Putln("")
c.Putln("type %sEvent struct {", name)
ev.Fields.MorphDefine(c)
c.Putln("}")
c.Putln("")
c.Putln("func New%s(buf []byte) %sEvent {", name, name)
c.Putln("var v %sEvent", name)
ev.Fields.MorphRead(c, FieldsEvent, ev.NoSequence)
c.Putln("return v")
c.Putln("}")
c.Putln("")
c.Putln("func (err %sEvent) ImplementsEvent() { }", name)
c.Putln("")
c.Putln("func (ev %sEvent) Bytes() []byte {", name)
// ev.Fields.MorphWrite(c, FieldsEvent)
c.Putln("}")
c.Putln("")
c.Putln("func init() {")
c.Putln("newEventFuncs[%d] = New%s", ev.Number, name)
c.Putln("}")
c.Putln("")
}
// EventCopy morphing.
func (evcopy *EventCopy) Morph(c *Context) {
oldName, newName := evcopy.Ref.Morph(c), evcopy.Name.Morph(c)
c.Putln("const %s = %d", newName, evcopy.Number)
c.Putln("")
c.Putln("type %sEvent %sEvent", newName, oldName)
c.Putln("")
c.Putln("func New%s(buf []byte) %sEvent {", newName, newName)
c.Putln("return (%sEvent)(New%s(buf))", newName, oldName)
c.Putln("}")
c.Putln("")
c.Putln("func (err %sEvent) ImplementsEvent() { }", newName)
c.Putln("")
c.Putln("func (ev %sEvent) Bytes() []byte {", newName)
c.Putln("return (%sEvent)(ev).Bytes()", oldName)
c.Putln("}")
c.Putln("")
c.Putln("func init() {")
c.Putln("newEventFuncs[%d] = New%s", evcopy.Number, newName)
c.Putln("}")
c.Putln("")
}
// Error morphing.
@@ -162,6 +423,26 @@ func (err *Error) Morph(c *Context) {
// ErrorCopy morphing.
func (errcopy *ErrorCopy) Morph(c *Context) {
oldName, newName := errcopy.Ref.Morph(c), errcopy.Name.Morph(c)
c.Putln("const Bad%s = %d", newName, errcopy.Number)
c.Putln("")
c.Putln("type %sError %sError", newName, oldName)
c.Putln("")
c.Putln("func New%sError(buf []byte) %sError {", newName, newName)
c.Putln("return (%sError)(New%sError(buf))", newName, oldName)
c.Putln("}")
c.Putln("")
c.Putln("func (err %sError) ImplementsError() { }", newName)
c.Putln("")
c.Putln("func (err %sError) Bytes() []byte {", newName)
c.Putln("return (%sError)(err).Bytes()", oldName)
c.Putln("}")
c.Putln("")
c.Putln("func init() {")
c.Putln("newErrorFuncs[%d] = New%sError", errcopy.Number, newName)
c.Putln("}")
c.Putln("")
}
/******************************************************************************/