import (
	"text/scanner"

	"cmd/internal/src"
)

// A Stack is a stack of TokenReaders. As the top TokenReader hits EOF,
// it resumes reading the next one down.
type Stack struct {
	tr []TokenReader
}

// Push adds tr to the top (end) of the input stack. (Popping happens automatically.)
func (s *Stack) Push(tr TokenReader) {
	s.tr = append(s.tr, tr)
}

func (s *Stack) Next() ScanToken {
	tos := s.tr[len(s.tr)-1]

func NewLexer(name string) TokenReader {
	input := NewInput(name)
	fd, err := os.Open(name)
	if err != nil {
		log.Fatalf("%s\n", err)
	}
	input.Push(NewTokenizer(name, fd, fd))
	return input
}

// The other files in this directory each contain an implementation of TokenReader.

// A TokenReader is like a reader, but returns lex tokens of type Token. It also can tell you what

	"text/scanner"
	"unicode"

	"cmd/asm/internal/flags"
	"cmd/internal/objabi"
	"cmd/internal/src"
)

// A Tokenizer is a simple wrapping of text/scanner.Scanner, configured
// for our purposes and made a TokenReader. It forms the lowest level,
// turning text from readers into tokens.
type Tokenizer struct {
	tok  ScanToken
	s    *scanner.Scanner
	base *src.PosBase
	line int

		}
	}
}

func tokenMap(mapping func(t Token) Token) func(TokenReader) TokenReader {
	return func(src TokenReader) TokenReader {
		return mapper{
			t: src,
			f: mapping,
		}
	}
}

type mapper struct {
	t TokenReader
	f func(Token) Token
}

func (m mapper) Token() (Token, error) {
	tok, err := m.t.Token()

pkg encoding/hex, func NewEncoder(io.Writer) io.Writer
pkg encoding/json, method (*Decoder) DisallowUnknownFields()
pkg encoding/xml, func NewTokenDecoder(TokenReader) *Decoder
pkg encoding/xml, type TokenReader interface { Token }
pkg encoding/xml, type TokenReader interface, Token() (Token, error)
pkg flag, method (*FlagSet) ErrorHandling() ErrorHandling
pkg flag, method (*FlagSet) Name() string

		return v.Copy()
	case Comment:
		return v.Copy()
	case Directive:
		return v.Copy()
	case ProcInst:
		return v.Copy()
	case StartElement:
		return v.Copy()
	}
	return t
}

// A TokenReader is anything that can decode a stream of XML tokens, including a
// [Decoder].
//
// When Token encounters an error or end-of-file condition after successfully

	}
	// Newline must be next.
	tok := in.Stack.Next()
	if tok != '\n' {
		in.Error("syntax error in #undef for macro:", name)
	}
	delete(in.macros, name)
}

func (in *Input) Push(r TokenReader) {
	if len(in.tr) > 100 {
		in.Error("input recursion")
	}
	in.Stack.Push(r)
}

func (in *Input) Close() {

	"cmd/asm/internal/lex"
	"cmd/internal/obj"
	"cmd/internal/obj/arm64"
	"cmd/internal/obj/x86"
	"cmd/internal/objabi"
	"cmd/internal/src"
	"cmd/internal/sys"
)

type Parser struct {
	lex           lex.TokenReader
	lineNum       int   // Line number in source file.
	errorLine     int   // Line number of last error.
	errorCount    int   // Number of errors.

		{"TagPathError.Field1", Field, 0},
		{"TagPathError.Field2", Field, 0},
		{"TagPathError.Struct", Field, 0},
		{"TagPathError.Tag1", Field, 0},
		{"TagPathError.Tag2", Field, 0},
		{"Token", Type, 0},
		{"TokenReader", Type, 10},
		{"Unmarshal", Func, 0},
		{"UnmarshalError", Type, 0},
		{"Unmarshaler", Type, 2},
		{"UnmarshalerAttr", Type, 2},
		{"UnsupportedTypeError", Type, 0},