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|
package main
import (
"fmt"
"log"
)
type Protocol struct {
Name string
ExtXName string
ExtName string
MajorVersion string
MinorVersion string
Imports []*Protocol
Types []Type
Requests []*Request
}
// Initialize traverses all structures, looks for 'Translation' type,
// and looks up the real type in the namespace. It also sets the source
// name for all relevant fields/structures.
// This is necessary because we don't traverse the XML in order initially.
func (p *Protocol) Initialize() {
for _, typ := range p.Types {
typ.Initialize(p)
}
for _, req := range p.Requests {
req.Initialize(p)
}
}
type Request struct {
srcName string
xmlName string
Opcode int
Combine bool
Fields []Field
Reply *Reply
}
func (r *Request) Initialize(p *Protocol) {
r.srcName = SrcName(r.xmlName)
if r.Reply != nil {
r.Reply.Initialize(p)
}
for _, field := range r.Fields {
field.Initialize(p)
}
}
func (r *Request) SrcName() string {
return r.srcName
}
func (r *Request) XmlName() string {
return r.xmlName
}
func (r *Request) ReplyName() string {
if r.Reply == nil {
log.Panicf("Cannot call 'ReplyName' on request %s, which has no reply.",
r.SrcName())
}
return fmt.Sprintf("%sReply", r.SrcName())
}
// Size for Request needs a context.
// Namely, if this is an extension, we need to account for *four* bytes
// of a header (extension opcode, request opcode, and the sequence number).
// If it's a core protocol request, then we only account for *three*
// bytes of the header (remove the extension opcode).
func (r *Request) Size(c *Context) Size {
size := newFixedSize(0)
if c.protocol.Name == "xproto" {
size = size.Add(newFixedSize(3))
} else {
size = size.Add(newFixedSize(4))
}
for _, field := range r.Fields {
size = size.Add(field.Size())
}
return size
}
type Reply struct {
Fields []Field
}
func (r *Reply) Size() Size {
size := newFixedSize(0)
// Account for reply discriminant, sequence number and reply length
size = size.Add(newFixedSize(7))
for _, field := range r.Fields {
size = size.Add(field.Size())
}
return size
}
func (r *Reply) Initialize(p *Protocol) {
for _, field := range r.Fields {
field.Initialize(p)
}
}
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