nswrap/main.go

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Go
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package main
import (
"flag"
"fmt"
"os"
"os/exec"
"runtime"
"strings"
"gitlab.wow.st/gmp/clast/ast"
"gitlab.wow.st/gmp/clast/wrap"
)
type ProgramArgs struct {
verbose bool
ast bool
inputFiles []string
clangFlags []string
outputFile string
packageName string
// A private option to output the Go as a *_test.go file.
outputAsTest bool
}
// DefaultProgramArgs default value of ProgramArgs
func DefaultProgramArgs() ProgramArgs {
return ProgramArgs{
verbose: false,
ast: false,
packageName: "main",
clangFlags: []string{},
outputAsTest: false,
}
}
func readAST(data []byte) []string {
return strings.Split(string(data), "\n")
}
type treeNode struct {
indent int
node ast.Node
}
func convertLinesToNodes(lines []string) []treeNode {
nodes := make([]treeNode, len(lines))
var counter int
for _, line := range lines {
if strings.TrimSpace(line) == "" {
continue
}
// It is tempting to discard null AST nodes, but these may
// have semantic importance: for example, they represent omitted
// for-loop conditions, as in for(;;).
line = strings.Replace(line, "<<<NULL>>>", "NullStmt", 1)
trimmed := strings.TrimLeft(line, "|\\- `")
node := ast.Parse(trimmed)
indentLevel := (len(line) - len(trimmed)) / 2
nodes[counter] = treeNode{indentLevel, node}
counter++
}
nodes = nodes[0:counter]
return nodes
}
func convertLinesToNodesParallel(lines []string) []treeNode {
// function f separate full list on 2 parts and
// then each part can recursive run function f
var f func([]string, int) []treeNode
f = func(lines []string, deep int) []treeNode {
deep = deep - 2
part := len(lines) / 2
var tr1 = make(chan []treeNode)
var tr2 = make(chan []treeNode)
go func(lines []string, deep int) {
if deep <= 0 || len(lines) < deep {
tr1 <- convertLinesToNodes(lines)
return
}
tr1 <- f(lines, deep)
}(lines[0:part], deep)
go func(lines []string, deep int) {
if deep <= 0 || len(lines) < deep {
tr2 <- convertLinesToNodes(lines)
return
}
tr2 <- f(lines, deep)
}(lines[part:], deep)
defer close(tr1)
defer close(tr2)
return append(<-tr1, <-tr2...)
}
// Parameter of deep - can be any, but effective to use
// same amount of CPU
return f(lines, runtime.NumCPU())
}
// buildTree converts an array of nodes, each prefixed with a depth into a tree.
func buildTree(nodes []treeNode, depth int) []ast.Node {
if len(nodes) == 0 {
return []ast.Node{}
}
// Split the list into sections, treat each section as a tree with its own
// root.
sections := [][]treeNode{}
for _, node := range nodes {
if node.indent == depth {
sections = append(sections, []treeNode{node})
} else {
sections[len(sections)-1] = append(sections[len(sections)-1], node)
}
}
results := []ast.Node{}
for _, section := range sections {
slice := []treeNode{}
for _, n := range section {
if n.indent > depth {
slice = append(slice, n)
}
}
children := buildTree(slice, depth+1)
for _, child := range children {
section[0].node.AddChild(child)
}
results = append(results, section[0].node)
}
return results
}
// Start begins transpiling an input file.
func Start(args ProgramArgs) (err error) {
if args.verbose {
fmt.Println("Start tanspiling ...")
}
if os.Getenv("GOPATH") == "" {
return fmt.Errorf("The $GOPATH must be set")
}
// 1. Compile it first (checking for errors)
for _, in := range args.inputFiles {
_, err := os.Stat(in)
if err != nil {
return fmt.Errorf("Input file %s is not found", in)
}
}
// 2. Preprocess NOT DONE
// 3. Generate JSON from AST
if args.verbose {
fmt.Println("Running clang for AST tree...")
}
cargs := []string{"-xobjective-c", "-Xclang", "-ast-dump",
"-fsyntax-only","-fno-color-diagnostics"}
cargs = append(cargs,args.inputFiles...)
astPP, err := exec.Command("clang",cargs...).Output()
if err != nil {
// If clang fails it still prints out the AST, so we have to run it
// again to get the real error.
errBody, _ := exec.Command("clang", cargs...).CombinedOutput()
panic("clang failed: " + err.Error() + ":\n\n" + string(errBody))
}
if args.verbose {
fmt.Println("Reading clang AST tree...")
}
lines := readAST(astPP)
if args.ast {
for _, l := range lines {
fmt.Println(l)
}
fmt.Println()
return nil
}
// Converting to nodes
if args.verbose {
fmt.Println("Converting to nodes...")
}
nodes := convertLinesToNodesParallel(lines)
// build tree
if args.verbose {
fmt.Println("Building tree...")
}
tree := buildTree(nodes, 0)
unit := tree[0]
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w := wrap.NewWrapper(*debugFlag)
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for _, n := range(unit.Children()) {
switch x := n.(type) {
case *ast.ObjCInterfaceDecl:
w.AddInterface(x)
case *ast.ObjCCategoryDecl:
w.AddCategory(x)
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}
}
w.Wrap([]string{"NSString"})
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return nil
}
type inputDataFlags []string
func (i *inputDataFlags) String() (s string) {
for pos, item := range *i {
s += fmt.Sprintf("Flag %d. %s\n", pos, item)
}
return
}
func (i *inputDataFlags) Set(value string) error {
*i = append(*i, value)
return nil
}
var clangFlags inputDataFlags
func init() {
wrapCommand.Var(&clangFlags, "clang-flag", "Pass arguments to clang. You may provide multiple -clang-flag items.")
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astCommand.Var(&clangFlags, "clang-flag", "Pass arguments to clang. You may provide multiple -clang-flag items.")
}
var (
versionFlag = flag.Bool("v", false, "print the version and exit")
wrapCommand = flag.NewFlagSet("wrap", flag.ContinueOnError)
verboseFlag = wrapCommand.Bool("V", false, "print progress as comments")
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debugFlag = wrapCommand.Bool("d", false, "print debug information as comments")
outputFlag = wrapCommand.String("o", "", "output Go generated code to the specified file")
packageFlag = wrapCommand.String("p", "main", "set the name of the generated package")
wrapHelpFlag = wrapCommand.Bool("h", false, "print help information")
astCommand = flag.NewFlagSet("ast", flag.ContinueOnError)
astHelpFlag = astCommand.Bool("h", false, "print help information")
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)
func main() {
code := runCommand()
if code != 0 {
os.Exit(code)
}
}
func runCommand() int {
flag.Usage = func() {
usage := "Usage: %s [-v] [<command>] [<flags>] file1.c ...\n\n"
usage += "Commands:\n"
usage += " wrap\twrap an Objective-C interface for Go\n"
usage += " ast\t\tprint AST\n\n"
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usage += "Flags:\n"
fmt.Printf(usage, os.Args[0])
flag.PrintDefaults()
}
flag.Parse()
if *versionFlag {
// Simply print out the version and exit.
fmt.Println("version")
return 0
}
if flag.NArg() < 1 {
flag.Usage()
return 1
}
args := DefaultProgramArgs()
switch os.Args[1] {
case "ast":
err := astCommand.Parse(os.Args[2:])
if err != nil {
fmt.Printf("ast command cannot parse: %v", err)
return 1
}
if *astHelpFlag || astCommand.NArg() == 0 {
fmt.Printf("Usage: %s ast file.c\n", os.Args[0])
astCommand.PrintDefaults()
return 1
}
args.ast = true
args.inputFiles = astCommand.Args()
args.clangFlags = clangFlags
case "wrap":
err := wrapCommand.Parse(os.Args[2:])
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if err != nil {
fmt.Printf("wrap command cannot parse: %v", err)
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return 1
}
if *wrapHelpFlag || wrapCommand.NArg() == 0 {
fmt.Printf("Usage: %s wrap [-V] [-o file.go] [-p package] file1.c ...\n", os.Args[0])
wrapCommand.PrintDefaults()
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return 1
}
args.inputFiles = wrapCommand.Args()
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args.outputFile = *outputFlag
args.packageName = *packageFlag
args.verbose = *verboseFlag
args.clangFlags = clangFlags
default:
flag.Usage()
return 1
}
if err := Start(args); err != nil {
fmt.Printf("Error: %v\n", err)
return 1
}
return 0
}