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package main
import (
"fmt"
)
// BaseTypeMap is a map from X base types to Go types.
// X base types should correspond to the smallest set of X types
// that can be used to rewrite ALL X types in terms of Go types.
// That is, if you remove any of the following types, at least one
// XML protocol description will produce an invalid Go program.
// The types on the left *never* show themselves in the source.
var BaseTypeMap = map[string]string{
"CARD8": "byte",
"CARD16": "uint16",
"CARD32": "uint32",
"INT8": "int8",
"INT16": "int16",
"INT32": "int32",
"BYTE": "byte",
"BOOL": "bool",
"float": "float64",
"double": "float64",
"char": "byte",
"void": "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,
"void": 1,
// Id is a special type used to determine the size of all Xid types.
// "Id" is not actually written in the source.
"Id": 4,
}
// TypeMap is a map from types in the XML to type names that is used
// in the functions that follow. Basically, every occurrence of the key
// type is replaced with the value type.
var TypeMap = map[string]string{
"VISUALTYPE": "VisualInfo",
"DEPTH": "DepthInfo",
"SCREEN": "ScreenInfo",
"Setup": "SetupInfo",
}
// NameMap is the same as TypeMap, but for names.
var NameMap = map[string]string{}
// Reading, writing and defining...
// Base types
func (b *Base) Define(c *Context) {
c.Putln("// Skipping definition for base type '%s'",
SrcName(c.protocol, b.XmlName()))
c.Putln("")
}
// Enum types
func (enum *Enum) Define(c *Context) {
c.Putln("const (")
for _, item := range enum.Items {
c.Putln("%s%s = %d", enum.SrcName(), item.srcName, item.Expr.Eval())
}
c.Putln(")")
c.Putln("")
}
// Resource types
func (res *Resource) Define(c *Context) {
c.Putln("type %s uint32", res.SrcName())
c.Putln("")
c.Putln("func New%sId(c *xgb.Conn) (%s, error) {",
res.SrcName(), res.SrcName())
c.Putln("id, err := c.NewId()")
c.Putln("if err != nil {")
c.Putln("return 0, err")
c.Putln("}")
c.Putln("return %s(id), nil", res.SrcName())
c.Putln("}")
c.Putln("")
}
// TypeDef types
func (td *TypeDef) Define(c *Context) {
c.Putln("type %s %s", td.srcName, td.Old.SrcName())
c.Putln("")
}
// Field definitions, reads and writes.
// Pad fields
func (f *PadField) Define(c *Context) {
if f.Align > 0 {
c.Putln("// alignment gap to multiple of %d", f.Align)
} else {
c.Putln("// padding: %d bytes", f.Bytes)
}
}
func (f *PadField) Read(c *Context, prefix string) {
if f.Align > 0 {
c.Putln("b = (b + %d) & ^%d // alignment gap", f.Align-1, f.Align-1)
} else {
c.Putln("b += %s // padding", f.Size())
}
}
func (f *PadField) Write(c *Context, prefix string) {
if f.Align > 0 {
c.Putln("b = (b + %d) & ^%d // alignment gap", f.Align-1, f.Align-1)
} else {
c.Putln("b += %s // padding", f.Size())
}
}
// Local fields
func (f *LocalField) Define(c *Context) {
c.Putln("// local field: %s %s", f.SrcName(), f.Type.SrcName())
panic("unreachable")
}
func (f *LocalField) Read(c *Context, prefix string) {
c.Putln("// reading local field: %s (%s) :: %s",
f.SrcName(), f.Size(), f.Type.SrcName())
panic("unreachable")
}
func (f *LocalField) Write(c *Context, prefix string) {
c.Putln("// skip writing local field: %s (%s) :: %s",
f.SrcName(), f.Size(), f.Type.SrcName())
}
// Expr fields
func (f *ExprField) Define(c *Context) {
c.Putln("// expression field: %s %s (%s)",
f.SrcName(), f.Type.SrcName(), f.Expr)
panic("unreachable")
}
func (f *ExprField) Read(c *Context, prefix string) {
c.Putln("// reading expression field: %s (%s) (%s) :: %s",
f.SrcName(), f.Size(), f.Expr, f.Type.SrcName())
panic("unreachable")
}
func (f *ExprField) Write(c *Context, prefix string) {
// Special case for bools, grrr.
if f.Type.SrcName() == "bool" {
c.Putln("buf[b] = byte(%s)", f.Expr.Reduce(prefix))
c.Putln("b += 1")
} else {
WriteSimpleSingleField(c, f.Expr.Reduce(prefix), f.Type)
}
}
// Value field
func (f *ValueField) Define(c *Context) {
if f.MaskComment != "" {
c.PutComment(f.MaskComment)
}
c.Putln("%s %s", f.MaskName, f.SrcType())
if f.ListComment != "" {
c.PutComment(f.ListComment)
}
c.Putln("%s []uint32", f.ListName)
}
func (f *ValueField) Read(c *Context, prefix string) {
ReadSimpleSingleField(c,
fmt.Sprintf("%s%s", prefix, f.MaskName), f.MaskType)
c.Putln("")
c.Putln("%s%s = make([]uint32, %s)",
prefix, f.ListName, f.ListLength().Reduce(prefix))
c.Putln("for i := 0; i < %s; i++ {", f.ListLength().Reduce(prefix))
c.Putln("%s%s[i] = xgb.Get32(buf[b:])", prefix, f.ListName)
c.Putln("b += 4")
c.Putln("}")
c.Putln("b = xgb.Pad(b)")
}
func (f *ValueField) Write(c *Context, prefix string) {
WriteSimpleSingleField(c,
fmt.Sprintf("%s%s", prefix, f.MaskName), f.MaskType)
c.Putln("for i := 0; i < %s; i++ {", f.ListLength().Reduce(prefix))
c.Putln("xgb.Put32(buf[b:], %s%s[i])", prefix, f.ListName)
c.Putln("b += 4")
c.Putln("}")
c.Putln("b = xgb.Pad(b)")
}
// Switch field
func (f *SwitchField) Define(c *Context) {
if f.Comment != "" {
c.PutComment(f.Comment)
}
c.Putln("%s []uint32", f.Name)
}
func (f *SwitchField) Read(c *Context, prefix string) {
c.Putln("")
c.Putln("%s%s = make([]uint32, %s)",
prefix, f.Name, f.ListLength().Reduce(prefix))
c.Putln("for i := 0; i < %s; i++ {", f.ListLength().Reduce(prefix))
c.Putln("%s%s[i] = xgb.Get32(buf[b:])", prefix, f.Name)
c.Putln("b += 4")
c.Putln("}")
c.Putln("b = xgb.Pad(b)")
}
func (f *SwitchField) Write(c *Context, prefix string) {
c.Putln("for i := 0; i < %s; i++ {", f.ListLength().Reduce(prefix))
c.Putln("xgb.Put32(buf[b:], %s%s[i])", prefix, f.Name)
c.Putln("b += 4")
c.Putln("}")
c.Putln("b = xgb.Pad(b)")
}
|
