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