mirror of https://github.com/mappu/miqt.git
141 lines
3.6 KiB
Go
141 lines
3.6 KiB
Go
package main
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import (
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"go/format"
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"log"
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"strings"
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)
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func (p CppParameter) RenderTypeGo() string {
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if p.Pointer && p.ParameterType == "char" {
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return "string"
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}
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if p.ParameterType == "QString" {
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return "string"
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}
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ret := ""
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if p.ByRef || p.Pointer {
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ret += "*"
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}
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ret += p.ParameterType
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return ret // ignore const
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}
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func emitParametersGo(params []CppParameter) string {
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tmp := make([]string, 0, len(params))
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for _, p := range params {
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tmp = append(tmp, p.ParameterName+" "+p.RenderTypeGo())
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}
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return strings.Join(tmp, ", ")
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}
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func emitParametersGo2CABIForwarding(params []CppParameter) (preamble string, fowarding string) {
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tmp := make([]string, 0, len(params))
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for _, p := range params {
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if p.ParameterType == "QString" {
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// Go: convert string -> char* and len
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// CABI: convert char* and len -> real QString
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preamble += p.ParameterName + "_Cstring := C.CString(" + p.ParameterName + ")\n"
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preamble += "defer C.free(" + p.ParameterName + "_Cstring)\n"
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tmp = append(tmp, p.ParameterName+"_Cstring, len("+p.ParameterName+")")
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// TODO handle the return type as a pointer parameter
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} else if p.Pointer && p.ParameterType == "char" {
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// Single char* argument
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preamble += p.ParameterName + "_Cstring := C.CString(" + p.ParameterName + ")\n"
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preamble += "defer C.free(" + p.ParameterName + "_Cstring)\n"
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tmp = append(tmp, p.ParameterName+"_Cstring")
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} else if (p.Pointer || p.ByRef) && p.QtClassType() {
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// The C++ type is a pointer to Qt class
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// We want our functions to accept the Go wrapper type, and forward as cPointer()
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tmp = append(tmp, p.ParameterName+".cPointer()")
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} else {
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// Default
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tmp = append(tmp, p.ParameterName)
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}
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}
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return preamble, strings.Join(tmp, ", ")
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}
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func emitGo(src *CppParsedHeader, headerName string) (string, error) {
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ret := strings.Builder{}
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ret.WriteString(`package miqt
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/*
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#cgo CFLAGS: -fPIC
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#cgo pkg-config: Qt5Widgets
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#include "gen_` + headerName + `"
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#include <stdlib.h>
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*/
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import "C"
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`)
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for _, c := range src.Classes {
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ret.WriteString(`
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type ` + c.ClassName + ` struct {
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h C.P` + c.ClassName + `
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}
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func (this *` + c.ClassName + `) cPointer() C.P` + c.ClassName + ` {
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if this == nil {
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return nil
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}
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return this.h
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}
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`)
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for i, ctor := range c.Ctors {
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preamble, forwarding := emitParametersGo2CABIForwarding(ctor.Parameters)
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ret.WriteString(`
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// New` + c.ClassName + maybeSuffix(i) + ` constructs a new ` + c.ClassName + ` object.
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func New` + c.ClassName + maybeSuffix(i) + `(` + emitParametersGo(ctor.Parameters) + `) {
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` + preamble + ` ret := C.` + c.ClassName + `_new` + maybeSuffix(i) + `(` + forwarding + `)
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return &` + c.ClassName + `{h: ret}
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}
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`)
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}
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for _, m := range c.Methods {
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// TODO for any known pointer type, call its cPointer() method instead of passing it directly
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shouldReturn := "return "
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returnTypeDecl := m.ReturnType.ParameterType // FIXME handle byRef/const here too
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if returnTypeDecl == "void" {
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shouldReturn = ""
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returnTypeDecl = ""
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}
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preamble, forwarding := emitParametersGo2CABIForwarding(m.Parameters)
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ret.WriteString(`
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func (this *` + c.ClassName + `) ` + m.SafeMethodName() + `(` + emitParametersGo(m.Parameters) + `) ` + returnTypeDecl + ` {
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` + preamble + shouldReturn + ` C.` + c.ClassName + `_` + m.SafeMethodName() + `(` + forwarding + `)
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}
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`)
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}
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}
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// Run gofmt over the result
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formattedSrc, err := format.Source([]byte(ret.String()))
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if err != nil {
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log.Printf("gofmt failure: %v", err)
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formattedSrc = []byte(ret.String())
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}
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return string(formattedSrc), nil
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}
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