func (a *api) outputPrelude(f simprogtext.SimProgFile) {
f.AddLine("package " + a.PackageName)
f.AddLineIndent("import (")
f.AddLine(`"fmt"`)
f.AddLine(`"github.com/d-s-d/vesupro"`)
f.AddLineUnindent(")")
}
func (a *api) outputDispatchers(f simprogtext.SimProgFile) {
mCallParam := simprogtext.NewSimpleVar("mc")
errVar := simprogtext.NewSimpleVar("err")
argsVar := simprogtext.NewSimpleVar("arg")
rcvVar := simprogtext.NewSimpleVar("r")
for rcvTypeName, methods := range a.Methods {
f.AddLineIndent(
"func (%s *%s) Dispatch(%s *vesupro.MethodCall) "+
"(vesupro.VesuproObject, error) {",
rcvVar.VarName(), rcvTypeName, mCallParam.VarName())
f.AddLine("var %s error", errVar.VarName())
f.AddLine("%s := %s.Arguments", argsVar.VarName(),
mCallParam.VarName())
f.AddLine("switch %s.Name {", mCallParam.VarName())
for _, _m := range methods {
m := (*method)(_m)
f.AddLineIndent("case %q:", m.Name)
m.outputCall(f, mCallParam, argsVar, errVar, rcvVar,
[]string{"nil"})
f.Unindent()
}
f.AddLineIndent("default:")
f.AddLine(`return nil,fmt.Errorf("Unknown function %%s.", %s.Name)`,
mCallParam.VarName())
f.AddLineUnindent("}") // switch
f.AddLineUnindent("}") // DispatchCall function
}
}
func outputCheckErrorReturn(f simprogtext.SimProgFile,
errVar simprogtext.Var, nilVals []string) {
retArgs := make([]string, len(nilVals)+1)
copy(retArgs, nilVals)
retArgs[len(nilVals)] = errVar.VarName()
f.AddLineIndent("if %s != nil {", errVar.VarName())
f.AddLine("return %s", strings.Join(retArgs, ", "))
f.AddLineUnindent("}")
}
func (m *method) outputCall(f simprogtext.SimProgFile,
mCallVar, argsVar, errVar, rcvVar simprogtext.Var,
nilRetVals []string) error {
paramVars := make([]simprogtext.DynSSAVar, len(m.Params))
finalParams := make([]string, len(m.Params))
f.AddLineIndent("if len(%s.Arguments) != %d {", mCallVar.VarName(),
len(m.Params))
f.AddLine(
`fmt.Errof("Method \"%s\": Wrong number of arguments: %%d (want: %d)",`+
`len(%s))`, m.Name, len(m.Params), argsVar.VarName())
f.AddLineUnindent("}")
var err error
for i, param := range m.Params {
paramVars[i] = simprogtext.NewDynSSAVar(fmt.Sprintf(
"param_%d", param.Position), "")
// parse Argument
err = (*parameter)(param).OutputParseArgument(f, paramVars[i],
simprogtext.NewSimpleVar(fmt.Sprintf("%s[%d]", argsVar.VarName(),
i)), errVar)
// go sucks
if err != nil {
return err
}
// check error
outputCheckErrorReturn(f, errVar, nilRetVals)
}
for i, param := range m.Params {
if param.IsStruct {
finalParams[i] = paramVars[i].VarName()
} else {
finalParams[i] = fmt.Sprintf("%s(%s)", param.TypeName,
paramVars[i].VarName())
}
}
f.AddLine("return %s.%s(%s)", rcvVar.VarName(), m.Name,
strings.Join(finalParams, ", "))
return nil
}