mirror of https://github.com/mappu/miqt.git
382 lines
11 KiB
Go
382 lines
11 KiB
Go
package main
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import (
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"fmt"
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"sort"
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"strings"
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)
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func (p CppParameter) RenderTypeCpp() string {
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ret := p.ParameterType
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switch p.ParameterType {
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case "uint":
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ret = "unsigned int"
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case "ushort":
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ret = "unsigned short"
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case "ulong":
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ret = "unsigned long"
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case "qlonglong":
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ret = "int64_t"
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case "qulonglong":
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ret = "uint64_t"
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}
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if p.Pointer || p.ByRef {
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ret += "*"
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}
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return ret // ignore const
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}
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func emitReturnTypeCabi(p CppParameter) string {
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if p.ParameterType == "QString" {
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return "void" // Will be handled separately
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} else if _, ok := p.QListOf(); ok {
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return "void" // Will be handled separately
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} else if (p.Pointer || p.ByRef) && p.QtClassType() {
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return p.ParameterType + "*" // CABI type
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} else if p.QtClassType() && !p.Pointer {
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// Even if C++ returns by value, CABI is returning a heap copy (new'd, not malloc'd)
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return p.ParameterType + "*" // CABI type
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// return "void" // Handled separately with an _out pointer
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} else {
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return p.RenderTypeCpp()
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}
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}
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func emitParametersCabi(m CppMethod, selfType string) string {
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tmp := make([]string, 0, len(m.Parameters)+1)
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if selfType != "" {
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tmp = append(tmp, selfType+" self")
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}
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for _, p := range m.Parameters {
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if p.ParameterType == "QString" {
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// The Go code has called this with two arguments: char* and len
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// Declare that we take two parameters
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tmp = append(tmp, "const char* "+p.ParameterName+", size_t "+p.ParameterName+"_Strlen")
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} else if t, ok := p.QListOf(); ok {
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// The Go code has called this with two arguments: T* and len
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// Declare that we take two parameters
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// TODO support QList<int>
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tmp = append(tmp, t.ParameterType+"* "+p.ParameterName+", size_t "+p.ParameterName+"_len")
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} else if (p.ByRef || p.Pointer) && p.QtClassType() {
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// Pointer to Qt type
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// Replace with taking our PQ typedef by value
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tmp = append(tmp, p.ParameterType+"* "+p.ParameterName)
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} else if p.QtClassType() {
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// Qt type passed by value
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// The CABI will unconditionally take these by pointer and dereference them
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// when passing to C++
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tmp = append(tmp, p.ParameterType+"* "+p.ParameterName)
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} else {
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// RenderTypeCpp renders both pointer+reference as pointers
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tmp = append(tmp, p.RenderTypeCpp()+" "+p.ParameterName)
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}
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}
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// If the return type is QString, we need to handle returns via extra CABI
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// parameters
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// Qt C++: memory is in QString RAII
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// CABI: memory is moved into C.malloc/C.free
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// Go: converted to native Go string
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if m.ReturnType.ParameterType == "QString" {
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tmp = append(tmp, "char** _out, size_t* _out_Strlen")
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} else if t, ok := m.ReturnType.QListOf(); ok {
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tmp = append(tmp, t.ParameterType+"** _out, size_t* _out_len")
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}
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return strings.Join(tmp, ", ")
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}
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func emitParametersCABI2CppForwarding(params []CppParameter) (preamble string, forwarding string) {
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tmp := make([]string, 0, len(params)+1)
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for _, p := range params {
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if p.ParameterType == "QString" {
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// The CABI has accepted two parameters - need to convert to one real QString
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// Create it on the stack
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preamble += "\tQString " + p.ParameterName + "_QString = QString::fromUtf8(" + p.ParameterName + ", " + p.ParameterName + "_Strlen);\n"
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tmp = append(tmp, p.ParameterName+"_QString")
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} else if _, ok := p.QListOf(); ok {
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// The CABI has accepted two parameters - need to convert to one real QList<>
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// Create it on the stack
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preamble += "\t" + p.RenderTypeCpp() + " " + p.ParameterName + "_QList;\n"
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preamble += "\t" + p.ParameterName + "_QList.reserve(" + p.ParameterName + "_len);\n"
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preamble += "\tfor(size_t i = 0; i < " + p.ParameterName + "_len; ++i) {\n"
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preamble += "\t\t" + p.ParameterName + "_QList.push_back(" + p.ParameterName + "++);\n"
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preamble += "\t}\n"
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tmp = append(tmp, p.ParameterName+"_QList")
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} else if p.IntType() {
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// Use the raw ParameterType to select an explicit integer overload
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// Don't use RenderTypeCpp() since it canonicalizes some int types for CABI
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castType := p.ParameterType
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if p.Pointer {
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castType += "*"
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}
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tmp = append(tmp, "static_cast<"+castType+">("+p.ParameterName+")")
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} else if p.ByRef {
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// We changed RenderTypeCpp() to render this as a pointer
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// Need to dereference so we can pass as reference to the actual Qt C++ function
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//tmp = append(tmp, "*"+p.ParameterName)
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tmp = append(tmp, "*"+p.ParameterName)
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} else if p.QtClassType() && !p.Pointer {
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// CABI takes all Qt types by pointer, even if C++ wants them by value
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// Dereference the passed-in pointer
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tmp = append(tmp, "*"+p.ParameterName)
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// } else if p.QtClassType() && p.Pointer {
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// We need this static_cast<> anyway to convert from PQt (void*) to
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// the real Qt type
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// tmp = append(tmp, "static_cast<"+p.ParameterType+"*>("+p.ParameterName+")")
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} else {
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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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// getReferencedTypes finds all referenced Qt types in this file.
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func getReferencedTypes(src *CppParsedHeader) []string {
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foundTypes := map[string]struct{}{}
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for _, c := range src.Classes {
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foundTypes[c.ClassName] = struct{}{}
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for _, ctor := range c.Ctors {
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for _, p := range ctor.Parameters {
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if p.QtClassType() {
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foundTypes[p.ParameterType] = struct{}{}
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}
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if t, ok := p.QListOf(); ok && t.QtClassType() {
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foundTypes["QList"] = struct{}{}
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foundTypes[t.ParameterType] = struct{}{}
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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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for _, p := range m.Parameters {
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if p.QtClassType() {
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foundTypes[p.ParameterType] = struct{}{}
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}
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if t, ok := p.QListOf(); ok && t.QtClassType() {
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foundTypes["QList"] = struct{}{}
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foundTypes[t.ParameterType] = struct{}{}
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}
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}
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if m.ReturnType.QtClassType() {
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foundTypes[m.ReturnType.ParameterType] = struct{}{}
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}
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if t, ok := m.ReturnType.QListOf(); ok && t.QtClassType() {
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foundTypes["QList"] = struct{}{}
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foundTypes[t.ParameterType] = struct{}{}
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}
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}
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}
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foundTypesList := make([]string, 0, len(foundTypes))
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for ft := range foundTypes {
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if strings.HasPrefix(ft, "QList<") {
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continue
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}
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foundTypesList = append(foundTypesList, ft)
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}
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sort.Strings(foundTypesList)
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return foundTypesList
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}
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func emitBindingHeader(src *CppParsedHeader, filename string) (string, error) {
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ret := strings.Builder{}
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includeGuard := "GEN_" + strings.ToUpper(strings.Replace(filename, `.`, `_`, -1))
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ret.WriteString(`#ifndef ` + includeGuard + `
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#define ` + includeGuard + `
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
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#ifdef __cplusplus
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extern "C" {
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#endif
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`)
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foundTypesList := getReferencedTypes(src)
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ret.WriteString("#ifdef __cplusplus\n")
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for _, ft := range foundTypesList {
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if ft == "QList" {
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continue
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}
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ret.WriteString(`class ` + ft + ";\n")
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}
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ret.WriteString("#else\n")
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for _, ft := range foundTypesList {
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if ft == "QList" {
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continue
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}
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ret.WriteString(`typedef struct ` + ft + " " + ft + ";\n")
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}
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ret.WriteString("#endif\n")
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ret.WriteString("\n")
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for _, c := range src.Classes {
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for i, ctor := range c.Ctors {
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ret.WriteString(fmt.Sprintf("%s %s_new%s(%s);\n", c.ClassName+"*", c.ClassName, maybeSuffix(i), emitParametersCabi(ctor, "")))
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}
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for _, m := range c.Methods {
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ret.WriteString(fmt.Sprintf("%s %s_%s(%s);\n", emitReturnTypeCabi(m.ReturnType), c.ClassName, m.SafeMethodName(), emitParametersCabi(m, c.ClassName+"*")))
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}
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// delete
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ret.WriteString(fmt.Sprintf("void %s_Delete(%s* self);\n", c.ClassName, c.ClassName))
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ret.WriteString("\n")
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}
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ret.WriteString(
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`#ifdef __cplusplus
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} /* extern C */
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#endif
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#endif
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`)
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return ret.String(), nil
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}
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func emitBindingCpp(src *CppParsedHeader, filename string) (string, error) {
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ret := strings.Builder{}
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ret.WriteString(`#include "gen_` + filename + `"
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#include "` + filename + `"
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`)
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for _, ref := range getReferencedTypes(src) {
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if ref[0] != 'Q' {
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continue
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}
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ret.WriteString(`#include <` + ref + ">\n")
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}
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ret.WriteString("\n")
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for _, c := range src.Classes {
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for i, ctor := range c.Ctors {
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preamble, forwarding := emitParametersCABI2CppForwarding(ctor.Parameters)
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ret.WriteString(fmt.Sprintf(
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"%s* %s_new%s(%s) {\n"+
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"%s"+
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"\treturn new %s(%s);\n"+
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"}\n"+
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"\n",
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c.ClassName, c.ClassName, maybeSuffix(i), emitParametersCabi(ctor, ""),
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preamble,
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c.ClassName, forwarding,
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))
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}
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for _, m := range c.Methods {
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// Need to take an extra 'self' parameter
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shouldReturn := "return "
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afterCall := ""
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if m.ReturnType.ParameterType == "void" && !m.ReturnType.Pointer {
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shouldReturn = ""
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} else if m.ReturnType.ParameterType == "QString" {
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shouldReturn = "QString ret = "
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afterCall = "\t// Convert QString from UTF-16 in C++ RAII memory to UTF-8 in manually-managed C memory\n"
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afterCall += "\tQByteArray b = ret.toUtf8();\n"
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afterCall += "\t*_out = static_cast<char*>(malloc(b.length()));\n"
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afterCall += "\tmemcpy(*_out, b.data(), b.length());\n"
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afterCall += "\t*_out_Strlen = b.length();\n"
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} else if t, ok := m.ReturnType.QListOf(); ok {
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shouldReturn = m.ReturnType.ParameterType + " ret = "
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afterCall += "\t// Convert QList<> from C++ memory to manually-managed C memory\n"
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afterCall += "\t*_out = static_cast<" + t.RenderTypeCpp() + ">(malloc(sizeof(" + t.RenderTypeCpp() + ") * ret.length()));\n"
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afterCall += "\tfor (int i = 0, e = ret.length(); i < e; ++i) {\n"
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afterCall += "\t\t_out[i] = ret[i];\n"
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afterCall += "\t}\n"
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afterCall += "\t*_out_len = ret.length();\n"
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} else if m.ReturnType.QtClassType() && !m.ReturnType.Pointer {
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shouldReturn = m.ReturnType.ParameterType + " ret = "
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// afterCall = "\t// Copy-construct value returned type into Go-allocated POCO\n"
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// afterCall += "\t_*out = ret;\n"
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afterCall = "\t// Copy-construct value returned type into heap-allocated copy\n"
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afterCall += "\treturn static_cast<" + m.ReturnType.ParameterType + "*>(new " + m.ReturnType.ParameterType + "(ret));\n"
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} else if m.ReturnType.Const {
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shouldReturn += "(" + emitReturnTypeCabi(m.ReturnType) + ") "
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}
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preamble, forwarding := emitParametersCABI2CppForwarding(m.Parameters)
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nativeMethodName := m.MethodName
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if m.OverrideMethodName != "" {
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nativeMethodName = m.OverrideMethodName
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}
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ret.WriteString(fmt.Sprintf(
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"%s %s_%s(%s) {\n"+
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"%s"+
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"\t%sstatic_cast<%s*>(self)->%s(%s);\n"+
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"%s"+
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"}\n"+
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"\n",
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emitReturnTypeCabi(m.ReturnType), c.ClassName, m.SafeMethodName(), emitParametersCabi(m, c.ClassName+"*"),
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preamble,
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shouldReturn, c.ClassName, nativeMethodName, forwarding,
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afterCall,
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))
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}
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// Delete
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ret.WriteString(fmt.Sprintf(
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"void %s_Delete(%s* self) {\n"+
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"\tdelete static_cast<%s*>(self);\n"+
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"}\n"+
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"\n",
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c.ClassName, c.ClassName,
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c.ClassName,
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))
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}
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return ret.String(), nil
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}
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