forked from golang/go
/
fmt.go
1844 lines (1587 loc) · 38.4 KB
/
fmt.go
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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gc
import (
"bytes"
"cmd/internal/obj"
"fmt"
"strconv"
"strings"
"unicode/utf8"
)
// A FmtFlag value is a set of flags (or 0).
// They control how the Xconv functions format their values.
// See the respective function's documentation for details.
type FmtFlag int
const (
FmtWidth FmtFlag = 1 << iota
FmtLeft // "-"
FmtSharp // "#"
FmtSign // "+"
FmtUnsigned // "u"
FmtShort // "h"
FmtLong // "l"
FmtComma // ","
FmtByte // "hh"
FmtBody // for printing export bodies
)
//
// Format conversions
// %L int Line numbers
//
// %E int etype values (aka 'Kind')
//
// %O int Node Opcodes
// Flags: "%#O": print go syntax. (automatic unless fmtmode == FDbg)
//
// %J Node* Node details
// Flags: "%hJ" suppresses things not relevant until walk.
//
// %V Val* Constant values
//
// %S Sym* Symbols
// Flags: +,- #: mode (see below)
// "%hS" unqualified identifier in any mode
// "%hhS" in export mode: unqualified identifier if exported, qualified if not
//
// %T Type* Types
// Flags: +,- #: mode (see below)
// 'l' definition instead of name.
// 'h' omit "func" and receiver in function types
// 'u' (only in -/Sym mode) print type identifiers wit package name instead of prefix.
//
// %N Node* Nodes
// Flags: +,- #: mode (see below)
// 'h' (only in +/debug mode) suppress recursion
// 'l' (only in Error mode) print "foo (type Bar)"
//
// %H Nodes Nodes
// Flags: those of %N
// ',' separate items with ',' instead of ';'
//
// In mparith2.go and mparith3.go:
// %B Mpint* Big integers
// %F Mpflt* Big floats
//
// %S, %T and %N obey use the following flags to set the format mode:
const (
FErr = iota
FDbg
FExp
FTypeId
)
var fmtmode int = FErr
var fmtpkgpfx int // %uT stickyness
var fmtbody bool
//
// E.g. for %S: %+S %#S %-S print an identifier properly qualified for debug/export/internal mode.
//
// The mode flags +, - and # are sticky, meaning they persist through
// recursions of %N, %T and %S, but not the h and l flags. The u flag is
// sticky only on %T recursions and only used in %-/Sym mode.
//
// Useful format combinations:
//
// %+N %+H multiline recursive debug dump of node/nodelist
// %+hN %+hH non recursive debug dump
//
// %#N %#T export format
// %#lT type definition instead of name
// %#hT omit"func" and receiver in function signature
//
// %lN "foo (type Bar)" for error messages
//
// %-T type identifiers
// %-hT type identifiers without "func" and arg names in type signatures (methodsym)
// %-uT type identifiers with package name instead of prefix (typesym, dcommontype, typehash)
//
func setfmode(flags *FmtFlag) (fm int, fb bool) {
fm = fmtmode
fb = fmtbody
if *flags&FmtSign != 0 {
fmtmode = FDbg
} else if *flags&FmtSharp != 0 {
fmtmode = FExp
} else if *flags&FmtLeft != 0 {
fmtmode = FTypeId
}
if *flags&FmtBody != 0 {
fmtbody = true
}
*flags &^= (FmtSharp | FmtLeft | FmtSign | FmtBody)
return
}
// Fmt "%L": Linenumbers
var goopnames = []string{
OADDR: "&",
OADD: "+",
OADDSTR: "+",
OANDAND: "&&",
OANDNOT: "&^",
OAND: "&",
OAPPEND: "append",
OAS: "=",
OAS2: "=",
OBREAK: "break",
OCALL: "function call", // not actual syntax
OCAP: "cap",
OCASE: "case",
OCLOSE: "close",
OCOMPLEX: "complex",
OCOM: "^",
OCONTINUE: "continue",
OCOPY: "copy",
ODEC: "--",
ODELETE: "delete",
ODEFER: "defer",
ODIV: "/",
OEQ: "==",
OFALL: "fallthrough",
OFOR: "for",
OGE: ">=",
OGOTO: "goto",
OGT: ">",
OIF: "if",
OIMAG: "imag",
OINC: "++",
OIND: "*",
OLEN: "len",
OLE: "<=",
OLSH: "<<",
OLT: "<",
OMAKE: "make",
OMINUS: "-",
OMOD: "%",
OMUL: "*",
ONEW: "new",
ONE: "!=",
ONOT: "!",
OOROR: "||",
OOR: "|",
OPANIC: "panic",
OPLUS: "+",
OPRINTN: "println",
OPRINT: "print",
ORANGE: "range",
OREAL: "real",
ORECV: "<-",
ORECOVER: "recover",
ORETURN: "return",
ORSH: ">>",
OSELECT: "select",
OSEND: "<-",
OSUB: "-",
OSWITCH: "switch",
OXOR: "^",
OXFALL: "fallthrough",
}
func (o Op) String() string {
return oconv(o, 0)
}
func (o Op) GoString() string {
return oconv(o, FmtSharp)
}
func oconv(o Op, flag FmtFlag) string {
if (flag&FmtSharp != 0) || fmtmode != FDbg {
if o >= 0 && int(o) < len(goopnames) && goopnames[o] != "" {
return goopnames[o]
}
}
if o >= 0 && int(o) < len(opnames) && opnames[o] != "" {
return opnames[o]
}
return fmt.Sprintf("O-%d", o)
}
var classnames = []string{
"Pxxx",
"PEXTERN",
"PAUTO",
"PAUTOHEAP",
"PPARAM",
"PPARAMOUT",
"PFUNC",
}
// Fmt "%J": Node details.
func jconv(n *Node, flag FmtFlag) string {
var buf bytes.Buffer
c := flag & FmtShort
if c == 0 && n.Ullman != 0 {
fmt.Fprintf(&buf, " u(%d)", n.Ullman)
}
if c == 0 && n.Addable {
fmt.Fprintf(&buf, " a(%v)", n.Addable)
}
if c == 0 && n.Name != nil && n.Name.Vargen != 0 {
fmt.Fprintf(&buf, " g(%d)", n.Name.Vargen)
}
if n.Lineno != 0 {
fmt.Fprintf(&buf, " l(%d)", n.Lineno)
}
if c == 0 && n.Xoffset != BADWIDTH {
fmt.Fprintf(&buf, " x(%d%+d)", n.Xoffset, stkdelta[n])
}
if n.Class != 0 {
if int(n.Class) < len(classnames) {
fmt.Fprintf(&buf, " class(%s)", classnames[n.Class])
} else {
fmt.Fprintf(&buf, " class(%d?)", n.Class)
}
}
if n.Colas {
fmt.Fprintf(&buf, " colas(%v)", n.Colas)
}
if n.Name != nil && n.Name.Funcdepth != 0 {
fmt.Fprintf(&buf, " f(%d)", n.Name.Funcdepth)
}
if n.Func != nil && n.Func.Depth != 0 {
fmt.Fprintf(&buf, " ff(%d)", n.Func.Depth)
}
switch n.Esc {
case EscUnknown:
break
case EscHeap:
buf.WriteString(" esc(h)")
case EscScope:
buf.WriteString(" esc(s)")
case EscNone:
buf.WriteString(" esc(no)")
case EscNever:
if c == 0 {
buf.WriteString(" esc(N)")
}
default:
fmt.Fprintf(&buf, " esc(%d)", n.Esc)
}
if e, ok := n.Opt().(*NodeEscState); ok && e.Escloopdepth != 0 {
fmt.Fprintf(&buf, " ld(%d)", e.Escloopdepth)
}
if c == 0 && n.Typecheck != 0 {
fmt.Fprintf(&buf, " tc(%d)", n.Typecheck)
}
if c == 0 && n.Dodata != 0 {
fmt.Fprintf(&buf, " dd(%d)", n.Dodata)
}
if n.Isddd {
fmt.Fprintf(&buf, " isddd(%v)", n.Isddd)
}
if n.Implicit {
fmt.Fprintf(&buf, " implicit(%v)", n.Implicit)
}
if n.Embedded != 0 {
fmt.Fprintf(&buf, " embedded(%d)", n.Embedded)
}
if n.Addrtaken {
buf.WriteString(" addrtaken")
}
if n.Assigned {
buf.WriteString(" assigned")
}
if n.Bounded {
buf.WriteString(" bounded")
}
if n.NonNil {
buf.WriteString(" nonnil")
}
if c == 0 && n.Used {
fmt.Fprintf(&buf, " used(%v)", n.Used)
}
return buf.String()
}
// Fmt "%V": Values
func vconv(v Val, flag FmtFlag) string {
switch u := v.U.(type) {
case *Mpint:
if !u.Rune {
if (flag&FmtSharp != 0) || fmtmode == FExp {
return bconv(u, FmtSharp)
}
return bconv(u, 0)
}
x := u.Int64()
if ' ' <= x && x < utf8.RuneSelf && x != '\\' && x != '\'' {
return fmt.Sprintf("'%c'", int(x))
}
if 0 <= x && x < 1<<16 {
return fmt.Sprintf("'\\u%04x'", uint(int(x)))
}
if 0 <= x && x <= utf8.MaxRune {
return fmt.Sprintf("'\\U%08x'", uint64(x))
}
return fmt.Sprintf("('\\x00' + %v)", u)
case *Mpflt:
if (flag&FmtSharp != 0) || fmtmode == FExp {
return fconv(u, 0)
}
return fconv(u, FmtSharp)
case *Mpcplx:
if (flag&FmtSharp != 0) || fmtmode == FExp {
return fmt.Sprintf("(%v+%vi)", &u.Real, &u.Imag)
}
if v.U.(*Mpcplx).Real.CmpFloat64(0) == 0 {
return fmt.Sprintf("%vi", fconv(&u.Imag, FmtSharp))
}
if v.U.(*Mpcplx).Imag.CmpFloat64(0) == 0 {
return fconv(&u.Real, FmtSharp)
}
if v.U.(*Mpcplx).Imag.CmpFloat64(0) < 0 {
return fmt.Sprintf("(%v%vi)", fconv(&u.Real, FmtSharp), fconv(&u.Imag, FmtSharp))
}
return fmt.Sprintf("(%v+%vi)", fconv(&u.Real, FmtSharp), fconv(&u.Imag, FmtSharp))
case string:
return strconv.Quote(u)
case bool:
if u {
return "true"
}
return "false"
case *NilVal:
return "nil"
}
return fmt.Sprintf("<ctype=%d>", v.Ctype())
}
/*
s%,%,\n%g
s%\n+%\n%g
s%^[ ]*T%%g
s%,.*%%g
s%.+% [T&] = "&",%g
s%^ ........*\]%&~%g
s%~ %%g
*/
var etnames = []string{
Txxx: "Txxx",
TINT: "INT",
TUINT: "UINT",
TINT8: "INT8",
TUINT8: "UINT8",
TINT16: "INT16",
TUINT16: "UINT16",
TINT32: "INT32",
TUINT32: "UINT32",
TINT64: "INT64",
TUINT64: "UINT64",
TUINTPTR: "UINTPTR",
TFLOAT32: "FLOAT32",
TFLOAT64: "FLOAT64",
TCOMPLEX64: "COMPLEX64",
TCOMPLEX128: "COMPLEX128",
TBOOL: "BOOL",
TPTR32: "PTR32",
TPTR64: "PTR64",
TFUNC: "FUNC",
TARRAY: "ARRAY",
TSLICE: "SLICE",
TSTRUCT: "STRUCT",
TCHAN: "CHAN",
TMAP: "MAP",
TINTER: "INTER",
TFORW: "FORW",
TSTRING: "STRING",
TUNSAFEPTR: "TUNSAFEPTR",
TANY: "ANY",
TIDEAL: "TIDEAL",
TNIL: "TNIL",
TBLANK: "TBLANK",
TFUNCARGS: "TFUNCARGS",
TCHANARGS: "TCHANARGS",
TINTERMETH: "TINTERMETH",
TDDDFIELD: "TDDDFIELD",
}
func (et EType) String() string {
if int(et) < len(etnames) && etnames[et] != "" {
return etnames[et]
}
return fmt.Sprintf("E-%d", et)
}
// Fmt "%S": syms
func symfmt(s *Sym, flag FmtFlag) string {
if s.Pkg != nil && flag&FmtShort == 0 {
switch fmtmode {
case FErr: // This is for the user
if s.Pkg == builtinpkg || s.Pkg == localpkg {
return s.Name
}
// If the name was used by multiple packages, display the full path,
if s.Pkg.Name != "" && numImport[s.Pkg.Name] > 1 {
return fmt.Sprintf("%q.%s", s.Pkg.Path, s.Name)
}
return s.Pkg.Name + "." + s.Name
case FDbg:
return s.Pkg.Name + "." + s.Name
case FTypeId:
if flag&FmtUnsigned != 0 {
return s.Pkg.Name + "." + s.Name // dcommontype, typehash
}
return s.Pkg.Prefix + "." + s.Name // (methodsym), typesym, weaksym
case FExp:
if s.Name != "" && s.Name[0] == '.' {
Fatalf("exporting synthetic symbol %s", s.Name)
}
if s.Pkg != builtinpkg {
return fmt.Sprintf("@%q.%s", s.Pkg.Path, s.Name)
}
}
}
if flag&FmtByte != 0 {
// FmtByte (hh) implies FmtShort (h)
// skip leading "type." in method name
p := s.Name
if i := strings.LastIndex(s.Name, "."); i >= 0 {
p = s.Name[i+1:]
}
// exportname needs to see the name without the prefix too.
if (fmtmode == FExp && !exportname(p)) || fmtmode == FDbg {
return fmt.Sprintf("@%q.%s", s.Pkg.Path, p)
}
return p
}
return s.Name
}
var basicnames = []string{
TINT: "int",
TUINT: "uint",
TINT8: "int8",
TUINT8: "uint8",
TINT16: "int16",
TUINT16: "uint16",
TINT32: "int32",
TUINT32: "uint32",
TINT64: "int64",
TUINT64: "uint64",
TUINTPTR: "uintptr",
TFLOAT32: "float32",
TFLOAT64: "float64",
TCOMPLEX64: "complex64",
TCOMPLEX128: "complex128",
TBOOL: "bool",
TANY: "any",
TSTRING: "string",
TNIL: "nil",
TIDEAL: "untyped number",
TBLANK: "blank",
}
func typefmt(t *Type, flag FmtFlag) string {
if t == nil {
return "<T>"
}
if t == bytetype || t == runetype {
// in %-T mode collapse rune and byte with their originals.
if fmtmode != FTypeId {
return sconv(t.Sym, FmtShort)
}
t = Types[t.Etype]
}
if t == errortype {
return "error"
}
// Unless the 'l' flag was specified, if the type has a name, just print that name.
if flag&FmtLong == 0 && t.Sym != nil && t != Types[t.Etype] {
switch fmtmode {
case FTypeId:
if flag&FmtShort != 0 {
if t.Vargen != 0 {
return fmt.Sprintf("%v·%d", sconv(t.Sym, FmtShort), t.Vargen)
}
return sconv(t.Sym, FmtShort)
}
if flag&FmtUnsigned != 0 {
return sconv(t.Sym, FmtUnsigned)
}
fallthrough
case FExp:
if t.Sym.Pkg == localpkg && t.Vargen != 0 {
return fmt.Sprintf("%v·%d", t.Sym, t.Vargen)
}
}
return sconv(t.Sym, 0)
}
if int(t.Etype) < len(basicnames) && basicnames[t.Etype] != "" {
prefix := ""
if fmtmode == FErr && (t == idealbool || t == idealstring) {
prefix = "untyped "
}
return prefix + basicnames[t.Etype]
}
if fmtmode == FDbg {
fmtmode = 0
str := t.Etype.String() + "-" + typefmt(t, flag)
fmtmode = FDbg
return str
}
switch t.Etype {
case TPTR32, TPTR64:
if fmtmode == FTypeId && (flag&FmtShort != 0) {
return "*" + Tconv(t.Elem(), FmtShort)
}
return "*" + t.Elem().String()
case TARRAY:
if t.isDDDArray() {
return "[...]" + t.Elem().String()
}
return fmt.Sprintf("[%d]%v", t.NumElem(), t.Elem())
case TSLICE:
return "[]" + t.Elem().String()
case TCHAN:
switch t.ChanDir() {
case Crecv:
return "<-chan " + t.Elem().String()
case Csend:
return "chan<- " + t.Elem().String()
}
if t.Elem() != nil && t.Elem().IsChan() && t.Elem().Sym == nil && t.Elem().ChanDir() == Crecv {
return "chan (" + t.Elem().String() + ")"
}
return "chan " + t.Elem().String()
case TMAP:
return "map[" + t.Key().String() + "]" + t.Val().String()
case TINTER:
var buf bytes.Buffer
buf.WriteString("interface {")
for i, f := range t.Fields().Slice() {
if i != 0 {
buf.WriteString(";")
}
buf.WriteString(" ")
switch {
case f.Sym == nil:
// Check first that a symbol is defined for this type.
// Wrong interface definitions may have types lacking a symbol.
break
case exportname(f.Sym.Name):
buf.WriteString(sconv(f.Sym, FmtShort))
default:
buf.WriteString(sconv(f.Sym, FmtUnsigned))
}
buf.WriteString(Tconv(f.Type, FmtShort))
}
if t.NumFields() != 0 {
buf.WriteString(" ")
}
buf.WriteString("}")
return buf.String()
case TFUNC:
var buf bytes.Buffer
if flag&FmtShort != 0 {
// no leading func
} else {
if t.Recv() != nil {
buf.WriteString("method")
buf.WriteString(Tconv(t.Recvs(), 0))
buf.WriteString(" ")
}
buf.WriteString("func")
}
buf.WriteString(Tconv(t.Params(), 0))
switch t.Results().NumFields() {
case 0:
break
case 1:
if fmtmode != FExp {
buf.WriteString(" ")
buf.WriteString(Tconv(t.Results().Field(0).Type, 0)) // struct->field->field's type
break
}
fallthrough
default:
buf.WriteString(" ")
buf.WriteString(Tconv(t.Results(), 0))
}
return buf.String()
case TSTRUCT:
if m := t.StructType().Map; m != nil {
mt := m.MapType()
// Format the bucket struct for map[x]y as map.bucket[x]y.
// This avoids a recursive print that generates very long names.
if mt.Bucket == t {
return "map.bucket[" + m.Key().String() + "]" + m.Val().String()
}
if mt.Hmap == t {
return "map.hdr[" + m.Key().String() + "]" + m.Val().String()
}
if mt.Hiter == t {
return "map.iter[" + m.Key().String() + "]" + m.Val().String()
}
if mt.ConcurrentMap == t {
return "map.concurrent[" + m.Key().String() + "]" + m.Val().String()
}
if mt.BucketArray == t {
return "map.bucketarray[" + m.Key().String() + "]" + m.Val().String()
}
if mt.BucketData == t {
return "map.bucketdata[" + m.Key().String() + "]" + m.Val().String()
}
if mt.BucketHdr == t {
return "map.buckethdr[" + m.Key().String() + "]" + m.Val().String()
}
if mt.InterlockedInfo == t {
return "map.interlockedinfo[" + m.Key().String() + "]" + m.Val().String()
}
if mt.ConcurrentIterator == t {
return "map.citer[" + m.Key().String() + "]" + m.Val().String()
}
Yyerror("unknown internal map type")
}
var buf bytes.Buffer
if t.IsFuncArgStruct() {
buf.WriteString("(")
var flag1 FmtFlag
if fmtmode == FTypeId || fmtmode == FErr { // no argument names on function signature, and no "noescape"/"nosplit" tags
flag1 = FmtShort
}
for i, f := range t.Fields().Slice() {
if i != 0 {
buf.WriteString(", ")
}
buf.WriteString(Fldconv(f, flag1))
}
buf.WriteString(")")
} else {
buf.WriteString("struct {")
for i, f := range t.Fields().Slice() {
if i != 0 {
buf.WriteString(";")
}
buf.WriteString(" ")
buf.WriteString(Fldconv(f, FmtLong))
}
if t.NumFields() != 0 {
buf.WriteString(" ")
}
buf.WriteString("}")
}
return buf.String()
case TFORW:
if t.Sym != nil {
return "undefined " + t.Sym.String()
}
return "undefined"
case TUNSAFEPTR:
if fmtmode == FExp {
return "@\"unsafe\".Pointer"
}
return "unsafe.Pointer"
case TDDDFIELD:
if fmtmode == FExp {
Fatalf("cannot use TDDDFIELD with old exporter")
}
return fmt.Sprintf("%v <%v> %v", t.Etype, t.Sym, t.DDDField())
case Txxx:
return "Txxx"
}
if fmtmode == FExp {
Fatalf("missing %v case during export", t.Etype)
}
// Don't know how to handle - fall back to detailed prints.
return fmt.Sprintf("%v <%v> %v", t.Etype, t.Sym, t.Elem())
}
// Statements which may be rendered with a simplestmt as init.
func stmtwithinit(op Op) bool {
switch op {
case OIF, OFOR, OSWITCH:
return true
}
return false
}
func stmtfmt(n *Node) string {
var f string
// some statements allow for an init, but at most one,
// but we may have an arbitrary number added, eg by typecheck
// and inlining. If it doesn't fit the syntax, emit an enclosing
// block starting with the init statements.
// if we can just say "for" n->ninit; ... then do so
simpleinit := n.Ninit.Len() == 1 && n.Ninit.First().Ninit.Len() == 0 && stmtwithinit(n.Op)
// otherwise, print the inits as separate statements
complexinit := n.Ninit.Len() != 0 && !simpleinit && (fmtmode != FErr)
// but if it was for if/for/switch, put in an extra surrounding block to limit the scope
extrablock := complexinit && stmtwithinit(n.Op)
if extrablock {
f += "{"
}
if complexinit {
f += fmt.Sprintf(" %v; ", n.Ninit)
}
switch n.Op {
case ODCL:
if fmtmode == FExp {
switch n.Left.Class {
case PPARAM, PPARAMOUT, PAUTO, PAUTOHEAP:
f += fmt.Sprintf("var %v %v", n.Left, n.Left.Type)
goto ret
}
}
f += fmt.Sprintf("var %v %v", n.Left.Sym, n.Left.Type)
case ODCLFIELD:
if n.Left != nil {
f += fmt.Sprintf("%v %v", n.Left, n.Right)
} else {
f += Nconv(n.Right, 0)
}
// Don't export "v = <N>" initializing statements, hope they're always
// preceded by the DCL which will be re-parsed and typechecked to reproduce
// the "v = <N>" again.
case OAS, OASWB:
if fmtmode == FExp && n.Right == nil {
break
}
if n.Colas && !complexinit {
f += fmt.Sprintf("%v := %v", n.Left, n.Right)
} else {
f += fmt.Sprintf("%v = %v", n.Left, n.Right)
}
case OASOP:
if n.Implicit {
if Op(n.Etype) == OADD {
f += fmt.Sprintf("%v++", n.Left)
} else {
f += fmt.Sprintf("%v--", n.Left)
}
break
}
f += fmt.Sprintf("%v %#v= %v", n.Left, Op(n.Etype), n.Right)
case OAS2:
if n.Colas && !complexinit {
f += fmt.Sprintf("%v := %v", hconv(n.List, FmtComma), hconv(n.Rlist, FmtComma))
break
}
fallthrough
case OAS2DOTTYPE, OAS2FUNC, OAS2MAPR, OAS2RECV:
f += fmt.Sprintf("%v = %v", hconv(n.List, FmtComma), hconv(n.Rlist, FmtComma))
case ORETURN:
f += fmt.Sprintf("return %v", hconv(n.List, FmtComma))
case ORETJMP:
f += fmt.Sprintf("retjmp %v", n.Sym)
case OPROC:
f += fmt.Sprintf("go %v", n.Left)
case ODEFER:
f += fmt.Sprintf("defer %v", n.Left)
case OIF:
if simpleinit {
f += fmt.Sprintf("if %v; %v { %v }", n.Ninit.First(), n.Left, n.Nbody)
} else {
f += fmt.Sprintf("if %v { %v }", n.Left, n.Nbody)
}
if n.Rlist.Len() != 0 {
f += fmt.Sprintf(" else { %v }", n.Rlist)
}
case OFOR:
if fmtmode == FErr { // TODO maybe only if FmtShort, same below
f += "for loop"
break
}
f += "for"
if simpleinit {
f += fmt.Sprintf(" %v;", n.Ninit.First())
} else if n.Right != nil {
f += " ;"
}
if n.Left != nil {
f += fmt.Sprintf(" %v", n.Left)
}
if n.Right != nil {
f += fmt.Sprintf("; %v", n.Right)
} else if simpleinit {
f += ";"
}
f += fmt.Sprintf(" { %v }", n.Nbody)
case ORANGE:
if fmtmode == FErr {
f += "for loop"
break
}
if n.List.Len() == 0 {
f += fmt.Sprintf("for range %v { %v }", n.Right, n.Nbody)
break
}
f += fmt.Sprintf("for %v = range %v { %v }", hconv(n.List, FmtComma), n.Right, n.Nbody)
case OSELECT, OSWITCH:
if fmtmode == FErr {
f += fmt.Sprintf("%v statement", n.Op)
break
}
f += n.Op.GoString() // %#v
if simpleinit {
f += fmt.Sprintf(" %v;", n.Ninit.First())
}
if n.Left != nil {
f += fmt.Sprintf(" %s ", Nconv(n.Left, 0))
}
f += fmt.Sprintf(" { %v }", n.List)
case OCASE, OXCASE:
if n.List.Len() != 0 {
f += fmt.Sprintf("case %v: %v", hconv(n.List, FmtComma), n.Nbody)
} else {
f += fmt.Sprintf("default: %v", n.Nbody)
}
case OBREAK,
OCONTINUE,
OGOTO,
OFALL,
OXFALL:
if n.Left != nil {
f += fmt.Sprintf("%#v %v", n.Op, n.Left)
} else {
f += n.Op.GoString() // %#v
}
case OEMPTY:
break
case OLABEL:
f += fmt.Sprintf("%v: ", n.Left)
}
ret:
if extrablock {
f += "}"
}
return f
}
var opprec = []int{
OAPPEND: 8,
OARRAYBYTESTR: 8,
OARRAYLIT: 8,
OARRAYRUNESTR: 8,
OCALLFUNC: 8,
OCALLINTER: 8,
OCALLMETH: 8,
OCALL: 8,
OCAP: 8,
OCLOSE: 8,
OCONVIFACE: 8,
OCONVNOP: 8,
OCONV: 8,
OCOPY: 8,
ODELETE: 8,
OGETG: 8,
OLEN: 8,
OLITERAL: 8,