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gx.go
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gx.go
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package main
import (
"bytes"
_ "embed"
"fmt"
"go/ast"
"go/token"
"go/types"
"io"
"os"
"path/filepath"
"reflect"
"regexp"
"sort"
"strconv"
"strings"
"unicode"
"golang.org/x/tools/go/packages"
)
type Target int
const (
CPP Target = iota
GLSL
)
type Compiler struct {
mainPkgPath string
fileSet *token.FileSet
types *types.Info
target Target
externs map[Target]map[types.Object]string
fieldIndices map[*types.Var]int
methodRenames map[types.Object]string
methodFieldTags map[types.Object]string
genTypeExprs map[Target]map[types.Type]string
genTypeDecls map[*ast.TypeSpec]string
genTypeDefns map[Target]map[*ast.TypeSpec]string
genTypeMetas map[*ast.TypeSpec]string
genFuncDecls map[Target]map[*ast.FuncDecl]string
genIdentifierCount int
indent int
atBlockEnd bool
errors *strings.Builder
output *strings.Builder
outputCC *strings.Builder
outputHH *strings.Builder
outputGLSLs map[string]*strings.Builder
}
//
// Error and writing utilities
//
func (c *Compiler) errorf(pos token.Pos, format string, args ...interface{}) {
fmt.Fprintf(c.errors, "%s: ", c.fileSet.PositionFor(pos, true))
fmt.Fprintf(c.errors, format, args...)
fmt.Fprintln(c.errors)
}
func (c *Compiler) errored() bool {
return c.errors.Len() != 0
}
func (c *Compiler) write(s string) {
c.atBlockEnd = false
if peek := c.output.String(); len(peek) > 0 && peek[len(peek)-1] == '\n' {
for i := 0; i < 2*c.indent; i++ {
c.output.WriteByte(' ')
}
}
c.output.WriteString(s)
}
func trimFinalSpace(s string) string {
if l := len(s); l > 0 && s[l-1] == ' ' {
return s[0 : l-1]
} else {
return s
}
}
func lowerFirst(s string) string {
result := []rune(s)
for i := 0; i < len(result) && unicode.IsUpper(result[i]); i++ {
if !(i > 0 && i+1 < len(result) && unicode.IsLower(result[i+1])) {
result[i] = unicode.ToLower(result[i])
}
}
return string(result)
}
func (c *Compiler) generateIdentifier(prefix string) string {
c.genIdentifierCount++
builder := &strings.Builder{}
builder.WriteString("gx__")
builder.WriteString(prefix)
builder.WriteString(strconv.Itoa(c.genIdentifierCount))
return builder.String()
}
//
// Types
//
func (c *Compiler) genTypeExpr(typ types.Type, pos token.Pos) string {
if result, ok := c.genTypeExprs[c.target][typ]; ok {
return result
}
builder := &strings.Builder{}
switch typ := typ.(type) {
case *types.Basic:
switch typ.Kind() {
case types.Bool, types.UntypedBool:
builder.WriteString("bool")
case types.Int, types.UntypedInt:
switch c.target {
case CPP:
builder.WriteString("int")
case GLSL:
builder.WriteString("float")
}
case types.Float32, types.Float64, types.UntypedFloat:
builder.WriteString("float")
case types.Uint:
builder.WriteString("gx::uint")
case types.Uint8:
builder.WriteString("std::uint8_t")
case types.Uint16:
builder.WriteString("std::uint16_t")
case types.Uint32:
builder.WriteString("std::uint32_t")
case types.Uint64:
builder.WriteString("std::uint64_t")
case types.String:
builder.WriteString("gx::String")
default:
c.errorf(pos, "%s not supported", typ.String())
}
builder.WriteByte(' ')
case *types.Pointer:
if typ, ok := typ.Elem().(*types.Basic); ok && typ.Kind() == types.String {
builder.WriteString("const ")
}
builder.WriteString(c.genTypeExpr(typ.Elem(), pos))
builder.WriteByte('*')
case *types.Named:
name := typ.Obj()
if ext, ok := c.externs[c.target][name]; ok {
builder.WriteString(ext)
} else {
builder.WriteString(name.Name())
}
if typeArgs := typ.TypeArgs(); typeArgs != nil {
builder.WriteString("<")
for i, nTypeArgs := 0, typeArgs.Len(); i < nTypeArgs; i++ {
if i > 0 {
builder.WriteString(", ")
}
builder.WriteString(trimFinalSpace(c.genTypeExpr(typeArgs.At(i), pos)))
}
builder.WriteString(">")
}
builder.WriteByte(' ')
case *types.TypeParam:
builder.WriteString(typ.Obj().Name())
builder.WriteByte(' ')
case *types.Array:
builder.WriteString("gx::Array<")
builder.WriteString(trimFinalSpace(c.genTypeExpr(typ.Elem(), pos)))
builder.WriteString(", ")
builder.WriteString(strconv.FormatInt(typ.Len(), 10))
builder.WriteString(">")
builder.WriteByte(' ')
case *types.Slice:
builder.WriteString("gx::Slice<")
builder.WriteString(trimFinalSpace(c.genTypeExpr(typ.Elem(), pos)))
builder.WriteString(">")
builder.WriteByte(' ')
default:
c.errorf(pos, "%s not supported", typ.String())
}
result := builder.String()
c.genTypeExprs[c.target][typ] = result
return result
}
func (c *Compiler) genTypeDecl(typeSpec *ast.TypeSpec) string {
if result, ok := c.genTypeDecls[typeSpec]; ok {
return result
}
builder := &strings.Builder{}
if typeSpec.TypeParams != nil {
builder.WriteString("template<")
for i, typeParam := range typeSpec.TypeParams.List {
for j, name := range typeParam.Names {
if i > 0 || j > 0 {
builder.WriteString(", ")
}
builder.WriteString("typename ")
builder.WriteString(name.String())
}
}
builder.WriteString(">\n")
}
switch typeSpec.Type.(type) {
case *ast.StructType:
builder.WriteString("struct ")
builder.WriteString(typeSpec.Name.String())
case *ast.InterfaceType:
// Empty -- only used as generic constraint during typecheck
builder = &strings.Builder{}
default:
builder.WriteString("using ")
builder.WriteString(typeSpec.Name.String())
builder.WriteString(" = ")
typ := c.types.TypeOf(typeSpec.Type)
builder.WriteString(trimFinalSpace(c.genTypeExpr(typ, typeSpec.Type.Pos())))
}
result := builder.String()
c.genTypeDecls[typeSpec] = result
return result
}
func (c *Compiler) genTypeDefn(typeSpec *ast.TypeSpec) string {
if result, ok := c.genTypeDefns[c.target][typeSpec]; ok {
return result
}
builder := &strings.Builder{}
switch typ := typeSpec.Type.(type) {
case *ast.StructType:
builder.WriteString(c.genTypeDecl(typeSpec))
builder.WriteString(" {\n")
for _, field := range typ.Fields.List {
if fieldType := c.types.TypeOf(field.Type); fieldType != nil {
var defaultVal string
if tag := field.Tag; tag != nil && tag.Kind == token.STRING {
unquoted, _ := strconv.Unquote(tag.Value)
defaultVal = reflect.StructTag(unquoted).Get("default")
}
typeExpr := c.genTypeExpr(fieldType, field.Type.Pos())
for _, fieldName := range field.Names {
builder.WriteString(" ")
builder.WriteString(typeExpr)
builder.WriteString(fieldName.String())
if defaultVal != "" {
builder.WriteString(" = ")
builder.WriteString(defaultVal)
}
builder.WriteString(";\n")
}
}
}
builder.WriteByte('}')
case *ast.InterfaceType:
// Empty -- only used as generic constraint during typecheck
default:
// Empty -- alias declaration is definition
}
result := builder.String()
c.genTypeDefns[c.target][typeSpec] = result
return result
}
func (c *Compiler) genTypeMeta(typeSpec *ast.TypeSpec) string {
if result, ok := c.genTypeMetas[typeSpec]; ok {
return result
}
builder := &strings.Builder{}
switch typ := typeSpec.Type.(type) {
case *ast.StructType:
typeParamsBuilder := &strings.Builder{}
if typeSpec.TypeParams != nil {
for i, typeParam := range typeSpec.TypeParams.List {
for j, name := range typeParam.Names {
if i > 0 || j > 0 {
typeParamsBuilder.WriteString(", ")
}
typeParamsBuilder.WriteString("typename ")
typeParamsBuilder.WriteString(name.String())
}
}
}
typeParams := typeParamsBuilder.String()
typeExprBuilder := &strings.Builder{}
typeExprBuilder.WriteString(typeSpec.Name.String())
if typeSpec.TypeParams != nil {
typeExprBuilder.WriteString("<")
for i, typeParam := range typeSpec.TypeParams.List {
for j, name := range typeParam.Names {
if i > 0 || j > 0 {
typeExprBuilder.WriteString(", ")
}
typeExprBuilder.WriteString(name.String())
}
}
typeExprBuilder.WriteString(">")
}
typeExpr := typeExprBuilder.String()
// `gx::FieldTag` specializations
tagIndex := 0
for _, field := range typ.Fields.List {
if field.Type != nil {
for _, fieldName := range field.Names {
if fieldName.IsExported() {
uppercase := false
var attribs []string
if tag := field.Tag; tag != nil && tag.Kind == token.STRING {
unquoted, _ := strconv.Unquote(tag.Value)
if attribsTag := reflect.StructTag(unquoted).Get("attribs"); attribsTag != "" {
for _, attrib := range strings.Split(attribsTag, ",") {
if attrib == "uppercase" {
uppercase = true
} else {
attribs = append(attribs, strings.TrimSpace(attrib))
}
}
}
}
builder.WriteString("template<")
builder.WriteString(typeParams)
builder.WriteString(">\nstruct gx::FieldTag<")
builder.WriteString(typeExpr)
builder.WriteString(", ")
builder.WriteString(strconv.Itoa(tagIndex))
builder.WriteString("> {\n")
builder.WriteString(" inline static constexpr gx::FieldAttribs attribs { .name = \"")
if uppercase {
builder.WriteString(fieldName.String())
} else {
builder.WriteString(lowerFirst(fieldName.String()))
}
builder.WriteByte('"')
for _, attrib := range attribs {
builder.WriteString(", .")
builder.WriteString(attrib)
builder.WriteString(" = true")
}
builder.WriteString(" };\n};\n")
tagIndex++
}
}
}
}
// `forEachField`
if typeParams != "" {
builder.WriteString("template<")
builder.WriteString(typeParams)
builder.WriteString(">\n")
}
builder.WriteString("inline void forEachField(")
builder.WriteString(typeExpr)
builder.WriteString(" &val, auto &&func) {\n")
tagIndex = 0
for _, field := range typ.Fields.List {
if field.Type != nil {
for _, fieldName := range field.Names {
if fieldName.IsExported() {
builder.WriteString(" func(gx::FieldTag<")
builder.WriteString(typeExpr)
builder.WriteString(", ")
builder.WriteString(strconv.Itoa(tagIndex))
builder.WriteString(">(), val.")
builder.WriteString(fieldName.String())
builder.WriteString(");\n")
tagIndex++
}
}
}
}
builder.WriteString("}")
case *ast.InterfaceType:
// Empty -- only used as generic constraint during typecheck
default:
// Empty -- alias declaration is definition
}
result := builder.String()
c.genTypeMetas[typeSpec] = result
return result
}
//
// Functions
//
var methodFieldTagRe = regexp.MustCompile(`^(.*)_([^_]*)$`)
func (c *Compiler) genFuncDecl(decl *ast.FuncDecl) string {
if result, ok := c.genFuncDecls[c.target][decl]; ok {
return result
}
obj := c.types.Defs[decl.Name]
sig := obj.Type().(*types.Signature)
recv := sig.Recv()
builder := &strings.Builder{}
// Type parameters
addTypeParams := func(typeParams *types.TypeParamList) {
if typeParams != nil {
builder.WriteString("template<")
for i, nTypeParams := 0, typeParams.Len(); i < nTypeParams; i++ {
if i > 0 {
builder.WriteString(", ")
}
builder.WriteString("typename ")
builder.WriteString(typeParams.At(i).Obj().Name())
}
builder.WriteString(">\n")
}
}
var recvNamedType *types.Named
if recv != nil {
switch recvType := recv.Type().(type) {
case *types.Named:
recvNamedType = recvType
addTypeParams(recvType.TypeParams())
case *types.Pointer:
switch elemType := recvType.Elem().(type) {
case *types.Named:
recvNamedType = elemType
addTypeParams(elemType.TypeParams())
}
}
}
addTypeParams(sig.TypeParams())
// Return type
if rets := sig.Results(); rets.Len() > 1 {
c.errorf(decl.Type.Results.Pos(), "multiple return values not supported")
} else if rets.Len() == 1 {
ret := rets.At(0)
builder.WriteString(c.genTypeExpr(ret.Type(), ret.Pos()))
} else {
if obj.Pkg().Name() == "main" && decl.Name.String() == "main" && recv == nil {
builder.WriteString("int ")
} else {
builder.WriteString("void ")
}
}
// Field tag
name := decl.Name.String()
fieldTag := ""
if recvNamedType != nil {
if structType, ok := recvNamedType.Underlying().(*types.Struct); ok {
if matches := methodFieldTagRe.FindStringSubmatch(name); len(matches) == 3 {
name = matches[1]
fieldName := matches[2]
matchingTagIndex := -1
tagIndex := 0
numFields := structType.NumFields()
for fieldIndex := 0; fieldIndex < numFields; fieldIndex++ {
if field := structType.Field(fieldIndex); field.Exported() && !field.Embedded() {
if field.Name() == fieldName {
matchingTagIndex = tagIndex
}
tagIndex++
}
}
typeExpr := trimFinalSpace(c.genTypeExpr(recvNamedType, recv.Pos()))
if matchingTagIndex == -1 {
c.errorf(decl.Name.Pos(), "struct %s has no field named %s", typeExpr, fieldName)
} else {
fieldTagBuilder := &strings.Builder{}
fieldTagBuilder.WriteString("gx::FieldTag<")
fieldTagBuilder.WriteString(typeExpr)
fieldTagBuilder.WriteString(", ")
fieldTagBuilder.WriteString(strconv.Itoa(matchingTagIndex))
fieldTagBuilder.WriteString(">")
fieldTag = fieldTagBuilder.String()
c.methodRenames[obj] = name
c.methodFieldTags[obj] = fieldTag
}
}
}
}
// Name
builder.WriteString(name)
// Parameters
builder.WriteByte('(')
addParam := func(param *types.Var) {
typ := param.Type()
if _, ok := typ.(*types.Signature); ok {
builder.WriteString("auto &&")
} else if basicType, ok := typ.(*types.Basic); ok && basicType.Kind() == types.String {
builder.WriteString("const gx::String &")
} else {
builder.WriteString(c.genTypeExpr(typ, param.Pos()))
}
builder.WriteString(param.Name())
}
if recv != nil {
if fieldTag != "" {
builder.WriteString(fieldTag)
builder.WriteString(", ")
}
addParam(recv)
}
for i, nParams := 0, sig.Params().Len(); i < nParams; i++ {
if i > 0 || recv != nil {
builder.WriteString(", ")
}
addParam(sig.Params().At(i))
}
builder.WriteByte(')')
result := builder.String()
c.genFuncDecls[c.target][decl] = result
return result
}
//
// Expressions
//
func (c *Compiler) writeIdent(ident *ast.Ident) {
typ := c.types.Types[ident]
if typ.IsNil() {
c.write("nullptr")
return
}
if typ.IsBuiltin() {
c.write("gx::")
}
if ext, ok := c.externs[c.target][c.types.Uses[ident]]; ok {
c.write(ext)
} else {
c.write(ident.Name) // TODO: Package namespace
}
}
func (c *Compiler) writeBasicLit(lit *ast.BasicLit) {
switch lit.Kind {
case token.INT:
c.write(lit.Value)
switch c.target {
case GLSL:
c.write(".0")
}
case token.FLOAT:
c.write(lit.Value)
switch c.target {
case CPP:
c.write("f")
}
case token.STRING:
if lit.Value[0] == '`' {
c.write("R\"(")
c.write(lit.Value[1 : len(lit.Value)-1])
c.write(")\"")
} else {
c.write(lit.Value)
}
case token.CHAR:
c.write(lit.Value)
default:
c.errorf(lit.Pos(), "unsupported literal kind")
}
}
func (c *Compiler) writeFuncLit(lit *ast.FuncLit) {
sig := c.types.TypeOf(lit).(*types.Signature)
if c.indent == 0 {
c.write("[](")
} else {
c.write("[&](")
}
for i, nParams := 0, sig.Params().Len(); i < nParams; i++ {
if i > 0 {
c.write(", ")
}
param := sig.Params().At(i)
if _, ok := param.Type().(*types.Signature); ok {
c.write("auto &&")
} else if basicType, ok := param.Type().(*types.Basic); ok && basicType.Kind() == types.String {
c.write("const gx::String &")
} else {
c.write(c.genTypeExpr(param.Type(), param.Pos()))
}
c.write(param.Name())
}
c.write(") ")
c.writeBlockStmt(lit.Body)
c.atBlockEnd = false
}
func (c *Compiler) writeCompositeLit(lit *ast.CompositeLit) {
useParens := c.target == GLSL
typeExpr := (c.genTypeExpr(c.types.TypeOf(lit), lit.Pos()))
if useParens {
c.write(trimFinalSpace(typeExpr))
c.write("(")
} else {
c.write(typeExpr)
c.write("{")
}
if len(lit.Elts) > 0 {
if _, ok := lit.Elts[0].(*ast.KeyValueExpr); ok {
if typ, ok := c.types.TypeOf(lit).Underlying().(*types.Struct); ok {
if nFields := typ.NumFields(); nFields != 0 {
if _, ok := c.fieldIndices[typ.Field(0)]; !ok {
for i := 0; i < nFields; i++ {
c.fieldIndices[typ.Field(i)] = i
}
}
}
lastIndex := 0
for _, elt := range lit.Elts {
field := c.types.ObjectOf(elt.(*ast.KeyValueExpr).Key.(*ast.Ident)).(*types.Var)
if index := c.fieldIndices[field]; index < lastIndex {
c.errorf(lit.Pos(), "struct literal fields must appear in definition order")
break
} else {
lastIndex = index
}
}
}
}
if c.fileSet.Position(lit.Pos()).Line == c.fileSet.Position(lit.Elts[0].Pos()).Line {
if !useParens {
c.write(" ")
}
for i, elt := range lit.Elts {
if i > 0 {
c.write(", ")
}
c.writeExpr(elt)
}
if !useParens {
c.write(" ")
}
} else {
c.write("\n")
c.indent++
nElts := len(lit.Elts)
for i, elt := range lit.Elts {
c.writeExpr(elt)
if !(useParens && i == nElts-1) {
c.write(",")
}
c.write("\n")
}
c.indent--
}
}
if useParens {
c.write(")")
} else {
c.write("}")
}
}
func (c *Compiler) writeParenExpr(bin *ast.ParenExpr) {
c.write("(")
c.writeExpr(bin.X)
c.write(")")
}
func (c *Compiler) writeSelectorExpr(sel *ast.SelectorExpr) {
switch c.target {
case GLSL:
if ident, ok := sel.X.(*ast.Ident); ok {
if glslStorageClass(ident.Name) != "" {
if ext, ok := c.externs[GLSL][c.types.Uses[sel.Sel]]; ok {
c.write(ext)
} else {
c.write(c.types.TypeOf(sel.X).(*types.Named).Obj().Name())
c.write("_")
c.write(sel.Sel.Name)
}
return
}
}
}
if basic, ok := c.types.TypeOf(sel.X).(*types.Basic); !(ok && basic.Kind() == types.Invalid) {
if _, ok := c.types.TypeOf(sel.X).(*types.Pointer); ok {
c.write("gx::deref(")
c.writeExpr(sel.X)
c.write(")")
} else {
c.writeExpr(sel.X)
}
c.write(".")
}
c.writeIdent(sel.Sel)
}
func (c *Compiler) writeIndexExpr(ind *ast.IndexExpr) {
if _, ok := c.types.TypeOf(ind.X).(*types.Pointer); ok {
c.write("gx::deref(")
c.writeExpr(ind.X)
c.write(")")
} else {
c.writeExpr(ind.X)
}
c.write("[")
c.writeExpr(ind.Index)
c.write("]")
}
func (c *Compiler) writeCallExpr(call *ast.CallExpr) {
method := false
funType := c.types.Types[call.Fun]
if _, ok := funType.Type.Underlying().(*types.Signature); ok || funType.IsBuiltin() {
// Function or method
if sel, ok := call.Fun.(*ast.SelectorExpr); ok {
obj := c.types.Uses[sel.Sel]
if sig, ok := obj.Type().(*types.Signature); ok && sig.Recv() != nil {
switch c.target {
case GLSL:
if ext, ok := c.externs[GLSL][c.types.Uses[sel.Sel]]; ok && !unicode.IsLetter(rune(ext[0])) {
switch len(call.Args) {
case 0:
c.write("(")
c.write(ext)
c.write("(")
c.writeExpr(sel.X)
c.write("))")
return
case 1:
c.write("((")
c.writeExpr(sel.X)
c.write(") ")
c.write(ext)
c.write(" (")
c.writeExpr(call.Args[0])
c.write("))")
return
}
c.errorf(call.Fun.Pos(), "GXSL operators must be unary or binary")
}
}
method = true
if rename, ok := c.methodRenames[obj]; ok {
c.write(rename)
} else {
c.writeIdent(sel.Sel)
}
c.write("(")
if fieldTag, ok := c.methodFieldTags[obj]; ok {
c.write(fieldTag)
c.write("{}, ")
}
_, xPtr := c.types.TypeOf(sel.X).(*types.Pointer)
_, recvPtr := sig.Recv().Type().(*types.Pointer)
if xPtr && !recvPtr {
c.write("gx::deref(")
c.writeExpr(sel.X)
c.write(")")
} else if !xPtr && recvPtr {
c.write("&(")
c.writeExpr(sel.X)
c.write(")")
} else {
c.writeExpr(sel.X)
}
}
}
if !method {
var typeArgs *types.TypeList
switch fun := call.Fun.(type) {
case *ast.Ident: // f(...)
c.writeIdent(fun)
typeArgs = c.types.Instances[fun].TypeArgs
case *ast.SelectorExpr: // pkg.f(...)
c.writeIdent(fun.Sel)
typeArgs = c.types.Instances[fun.Sel].TypeArgs
case *ast.IndexExpr:
switch fun := fun.X.(type) {
case *ast.Ident: // f[T](...)
c.writeIdent(fun)
typeArgs = c.types.Instances[fun].TypeArgs
case *ast.SelectorExpr: // pkg.f[T](...)
c.writeIdent(fun.Sel)
typeArgs = c.types.Instances[fun.Sel].TypeArgs
}
default:
c.writeExpr(fun)
}
switch c.target {
case CPP:
if typeArgs != nil {
c.write("<")
for i, nTypeArgs := 0, typeArgs.Len(); i < nTypeArgs; i++ {
if i > 0 {
c.write(", ")
}
c.write(trimFinalSpace(c.genTypeExpr(typeArgs.At(i), call.Fun.Pos())))
}
c.write(">")
}
}
c.write("(")
}
} else {
// Conversion
typeExpr := trimFinalSpace(c.genTypeExpr(funType.Type, call.Fun.Pos()))
if _, ok := call.Fun.(*ast.ParenExpr); ok {
c.write("(")
c.write(typeExpr)
c.write(")")
} else {
c.write(typeExpr)
}
c.write("(")
}
for i, arg := range call.Args {
if i > 0 || method {
c.write(", ")
}
c.writeExpr(arg)
}
c.write(")")
}
func (c *Compiler) writeStarExpr(star *ast.StarExpr) {
c.write("gx::deref(")
c.writeExpr(star.X)
c.write(")")
}
func (c *Compiler) writeUnaryExpr(un *ast.UnaryExpr) {
switch op := un.Op; op {
case token.ADD, token.SUB, token.NOT:
c.write(op.String())
case token.AND:
if !c.types.Types[un.X].Addressable() {
c.errorf(un.OpPos, "cannot take address of a temporary object")
}
c.write(op.String())
default:
c.errorf(un.OpPos, "unsupported unary operator")
}
c.writeExpr(un.X)
}
func (c *Compiler) writeBinaryExpr(bin *ast.BinaryExpr) {
needParens := false
switch bin.Op {
case token.AND, token.OR, token.XOR:
needParens = true
}
if needParens {
c.write("(")
}
c.writeExpr(bin.X)
c.write(" ")
switch op := bin.Op; op {
case token.EQL, token.NEQ, token.LSS, token.LEQ, token.GTR, token.GEQ,
token.ADD, token.SUB, token.MUL, token.QUO, token.REM,
token.AND, token.OR, token.XOR, token.SHL, token.SHR,
token.LAND, token.LOR:
c.write(op.String())
default:
c.errorf(bin.OpPos, "unsupported binary operator")
}
c.write(" ")
c.writeExpr(bin.Y)
if needParens {
c.write(")")
}
}
func (c *Compiler) writeKeyValueExpr(kv *ast.KeyValueExpr) {
if name, ok := kv.Key.(*ast.Ident); !ok {
c.errorf(kv.Pos(), "unsupported literal key")
} else {
c.write(".")
c.writeIdent(name)
c.write(" = ")
c.writeExpr(kv.Value)
}
}
func (c *Compiler) writeExpr(expr ast.Expr) {
switch expr := expr.(type) {
case *ast.Ident:
c.writeIdent(expr)
case *ast.BasicLit:
c.writeBasicLit(expr)
case *ast.FuncLit:
c.writeFuncLit(expr)
case *ast.CompositeLit:
c.writeCompositeLit(expr)
case *ast.ParenExpr:
c.writeParenExpr(expr)
case *ast.SelectorExpr:
c.writeSelectorExpr(expr)
case *ast.IndexExpr:
c.writeIndexExpr(expr)
case *ast.CallExpr:
c.writeCallExpr(expr)
case *ast.StarExpr:
c.writeStarExpr(expr)
case *ast.UnaryExpr:
c.writeUnaryExpr(expr)
case *ast.BinaryExpr:
c.writeBinaryExpr(expr)
case *ast.KeyValueExpr:
c.writeKeyValueExpr(expr)
default:
c.errorf(expr.Pos(), "unsupported expression type")
}
}
//
// Statements
//
func (c *Compiler) writeExprStmt(exprStmt *ast.ExprStmt) {
c.writeExpr(exprStmt.X)
}
func (c *Compiler) writeIncDecStmt(incDecStmt *ast.IncDecStmt) {
c.write("(")
c.writeExpr(incDecStmt.X)
c.write(")")
c.write(incDecStmt.Tok.String())
}
func (c *Compiler) writeAssignStmt(assignStmt *ast.AssignStmt) {
if len(assignStmt.Lhs) != 1 {
c.errorf(assignStmt.Pos(), "multi-value assignment unsupported")
return
}
if assignStmt.Tok == token.DEFINE {
typ := c.types.TypeOf(assignStmt.Rhs[0])
switch c.target {
case CPP:
if typ, ok := typ.(*types.Basic); ok && typ.Kind() == types.String {
c.write("gx::String ")
} else {
c.write("auto ")
}
case GLSL:
c.write(c.genTypeExpr(typ, assignStmt.Pos()))
}
}
c.writeExpr(assignStmt.Lhs[0])
c.write(" ")
switch op := assignStmt.Tok; op {
case token.DEFINE:
c.write("=")
case token.ASSIGN,
token.ADD_ASSIGN, token.SUB_ASSIGN, token.MUL_ASSIGN, token.QUO_ASSIGN, token.REM_ASSIGN,
token.AND_ASSIGN, token.OR_ASSIGN, token.XOR_ASSIGN, token.SHL_ASSIGN, token.SHR_ASSIGN:
c.write(op.String())
default:
c.errorf(assignStmt.TokPos, "unsupported assignment operator")
}
c.write(" ")
c.writeExpr(assignStmt.Rhs[0])
}
func (c *Compiler) writeDeferStmt(deferStmt *ast.DeferStmt) {
c.write("gx::Defer ")
c.write(c.generateIdentifier("Defer"))
c.write("([&](){\n")
c.indent++
c.writeCallExpr(deferStmt.Call)
c.write(";\n")
c.indent--
c.write("});")
}
func (c *Compiler) writeReturnStmt(retStmt *ast.ReturnStmt) {
if len(retStmt.Results) > 1 {
c.errorf(retStmt.Results[0].Pos(), "multiple return values not supported")
} else if len(retStmt.Results) == 1 {
c.write("return ")
c.writeExpr(retStmt.Results[0])
} else {
c.write("return")
}
}
func (c *Compiler) writeBranchStmt(branchStmt *ast.BranchStmt) {