Package scanner provides a scanner and tokenizer for UTF-8-encoded text. It takes an io.Reader providing the source, which then can be tokenized through repeated calls to the Scan function. For compatibility with existing tools, the NUL character is not allowed. If the first character in the source is a UTF-8 encoded byte order mark (BOM), it is discarded.
By default, a Scanner skips white space and Go comments and recognizes all literals as defined by the Go language specification. It may be customized to recognize only a subset of those literals and to recognize different identifier and white space characters.
package main
import (
"fmt"
"strings"
"text/scanner"
)
func main() {
const src = `
// This is scanned code.
if a > 10 {
someParsable = text
}`
var s scanner.Scanner
s.Init(strings.NewReader(src))
s.Filename = "example"
for tok := s.Scan(); tok != scanner.EOF; tok = s.Scan() {
fmt.Printf("%s: %s\n", s.Position, s.TokenText())
}
}
package main
import (
"fmt"
"strings"
"text/scanner"
"unicode"
)
func main() {
const src = "%var1 var2%"
var s scanner.Scanner
s.Init(strings.NewReader(src))
s.Filename = "default"
for tok := s.Scan(); tok != scanner.EOF; tok = s.Scan() {
fmt.Printf("%s: %s\n", s.Position, s.TokenText())
}
fmt.Println()
s.Init(strings.NewReader(src))
s.Filename = "percent"
// treat leading '%' as part of an identifier
s.IsIdentRune = func(ch rune, i int) bool {
return ch == '%' && i == 0 || unicode.IsLetter(ch) || unicode.IsDigit(ch) && i > 0
}
for tok := s.Scan(); tok != scanner.EOF; tok = s.Scan() {
fmt.Printf("%s: %s\n", s.Position, s.TokenText())
}
}
package main
import (
"fmt"
"strings"
"text/scanner"
)
func main() {
const src = `
// Comment begins at column 5.
This line should not be included in the output.
/*
This multiline comment
should be extracted in
its entirety.
*/
`
var s scanner.Scanner
s.Init(strings.NewReader(src))
s.Filename = "comments"
s.Mode ^= scanner.SkipComments // don't skip comments
for tok := s.Scan(); tok != scanner.EOF; tok = s.Scan() {
txt := s.TokenText()
if strings.HasPrefix(txt, "//") || strings.HasPrefix(txt, "/*") {
fmt.Printf("%s: %s\n", s.Position, txt)
}
}
}
package main
import (
"fmt"
"strings"
"text/scanner"
)
func main() {
// tab-separated values
const src = `aa ab ac ad
ba bb bc bd
ca cb cc cd
da db dc dd`
var (
col, row int
s scanner.Scanner
tsv [4][4]string // large enough for example above
)
s.Init(strings.NewReader(src))
s.Whitespace ^= 1<<'\t' | 1<<'\n' // don't skip tabs and new lines
for tok := s.Scan(); tok != scanner.EOF; tok = s.Scan() {
switch tok {
case '\n':
row++
col = 0
case '\t':
col++
default:
tsv[row][col] = s.TokenText()
}
}
fmt.Print(tsv)
}
Predefined mode bits to control recognition of tokens. For instance, to configure a Scanner such that it only recognizes (Go) identifiers, integers, and skips comments, set the Scanner's Mode field to:
ScanIdents | ScanInts | SkipComments
With the exceptions of comments, which are skipped if SkipComments is set, unrecognized tokens are not ignored. Instead, the scanner simply returns the respective individual characters (or possibly sub-tokens). For instance, if the mode is ScanIdents (not ScanStrings), the string "foo" is scanned as the token sequence '"' Ident '"'.
const (
ScanIdents = 1 << -Ident
ScanInts = 1 << -Int
ScanFloats = 1 << -Float // includes Ints
ScanChars = 1 << -Char
ScanStrings = 1 << -String
ScanRawStrings = 1 << -RawString
ScanComments = 1 << -Comment
SkipComments = 1 << -skipComment // if set with ScanComments, comments become white space
GoTokens = ScanIdents | ScanFloats | ScanChars | ScanStrings | ScanRawStrings | ScanComments | SkipComments
) The result of Scan is one of these tokens or a Unicode character.
const (
EOF = -(iota + 1)
Ident
Int
Float
Char
String
RawString
Comment
) GoWhitespace is the default value for the Scanner's Whitespace field. Its value selects Go's white space characters.
const GoWhitespace = 1<<'\t' | 1<<'\n' | 1<<'\r' | 1<<' '
func TokenString(tok rune) string
TokenString returns a printable string for a token or Unicode character.
A source position is represented by a Position value. A position is valid if Line > 0.
type Position struct {
Filename string // filename, if any
Offset int // byte offset, starting at 0
Line int // line number, starting at 1
Column int // column number, starting at 1 (character count per line)
}
func (pos *Position) IsValid() bool
IsValid reports whether the position is valid.
func (pos Position) String() string
A Scanner implements reading of Unicode characters and tokens from an io.Reader.
type Scanner struct {
// Error is called for each error encountered. If no Error
// function is set, the error is reported to os.Stderr.
Error func(s *Scanner, msg string)
// ErrorCount is incremented by one for each error encountered.
ErrorCount int
// The Mode field controls which tokens are recognized. For instance,
// to recognize Ints, set the ScanInts bit in Mode. The field may be
// changed at any time.
Mode uint
// The Whitespace field controls which characters are recognized
// as white space. To recognize a character ch <= ' ' as white space,
// set the ch'th bit in Whitespace (the Scanner's behavior is undefined
// for values ch > ' '). The field may be changed at any time.
Whitespace uint64
// IsIdentRune is a predicate controlling the characters accepted
// as the ith rune in an identifier. The set of valid characters
// must not intersect with the set of white space characters.
// If no IsIdentRune function is set, regular Go identifiers are
// accepted instead. The field may be changed at any time.
IsIdentRune func(ch rune, i int) bool // Go 1.4
// Start position of most recently scanned token; set by Scan.
// Calling Init or Next invalidates the position (Line == 0).
// The Filename field is always left untouched by the Scanner.
// If an error is reported (via Error) and Position is invalid,
// the scanner is not inside a token. Call Pos to obtain an error
// position in that case, or to obtain the position immediately
// after the most recently scanned token.
Position
// contains filtered or unexported fields
}
func (s *Scanner) Init(src io.Reader) *Scanner
Init initializes a Scanner with a new source and returns s. Error is set to nil, ErrorCount is set to 0, Mode is set to GoTokens, and Whitespace is set to GoWhitespace.
func (s *Scanner) Next() rune
Next reads and returns the next Unicode character. It returns EOF at the end of the source. It reports a read error by calling s.Error, if not nil; otherwise it prints an error message to os.Stderr. Next does not update the Scanner's Position field; use Pos() to get the current position.
func (s *Scanner) Peek() rune
Peek returns the next Unicode character in the source without advancing the scanner. It returns EOF if the scanner's position is at the last character of the source.
func (s *Scanner) Pos() (pos Position)
Pos returns the position of the character immediately after the character or token returned by the last call to Next or Scan. Use the Scanner's Position field for the start position of the most recently scanned token.
func (s *Scanner) Scan() rune
Scan reads the next token or Unicode character from source and returns it. It only recognizes tokens t for which the respective Mode bit (1<<-t) is set. It returns EOF at the end of the source. It reports scanner errors (read and token errors) by calling s.Error, if not nil; otherwise it prints an error message to os.Stderr.
func (s *Scanner) TokenText() string
TokenText returns the string corresponding to the most recently scanned token. Valid after calling Scan().
© Google, Inc.
Licensed under the Creative Commons Attribution License 3.0.
https://golang.org/pkg/text/scanner/