Documentation
¶
Overview ¶
Package token defines constants representing the lexical tokens of the Go programming language and basic operations on tokens (printing, predicates).
Example (RetrievePositionInfo) ¶
package main
import (
"fmt"
"go/ast"
"go/parser"
"go/token"
)
func main() {
fset := token.NewFileSet()
const src = `package main
import "fmt"
import "go/token"
//line :1:5
type p = token.Pos
const bad = token.NoPos
//line fake.go:42:11
func ok(pos p) bool {
return pos != bad
}
/*line :7:9*/func main() {
fmt.Println(ok(bad) == bad.IsValid())
}
`
f, err := parser.ParseFile(fset, "main.go", src, 0)
if err != nil {
fmt.Println(err)
return
}
// Print the location and kind of each declaration in f.
for _, decl := range f.Decls {
// Get the filename, line, and column back via the file set.
// We get both the relative and absolute position.
// The relative position is relative to the last line directive.
// The absolute position is the exact position in the source.
pos := decl.Pos()
relPosition := fset.Position(pos)
absPosition := fset.PositionFor(pos, false)
// Either a FuncDecl or GenDecl, since we exit on error.
kind := "func"
if gen, ok := decl.(*ast.GenDecl); ok {
kind = gen.Tok.String()
}
// If the relative and absolute positions differ, show both.
fmtPosition := relPosition.String()
if relPosition != absPosition {
fmtPosition += "[" + absPosition.String() + "]"
}
fmt.Printf("%s: %s\n", fmtPosition, kind)
}
}
Output: main.go:3:1: import main.go:5:1: import main.go:1:5[main.go:8:1]: type main.go:3:1[main.go:10:1]: const fake.go:42:11[main.go:13:1]: func fake.go:7:9[main.go:17:14]: func
Index ¶
- Constants
- func IsExported(name string) bool
- func IsIdentifier(name string) bool
- func IsKeyword(name string) bool
- type File
- func (f *File) AddLine(offset int)
- func (f *File) AddLineColumnInfo(offset int, filename string, line, column int)
- func (f *File) AddLineInfo(offset int, filename string, line int)
- func (f *File) Base() int
- func (f *File) Line(p Pos) int
- func (f *File) LineCount() int
- func (f *File) LineStart(line int) Pos
- func (f *File) Lines() []int
- func (f *File) MergeLine(line int)
- func (f *File) Name() string
- func (f *File) Offset(p Pos) int
- func (f *File) Pos(offset int) Pos
- func (f *File) Position(p Pos) (pos Position)
- func (f *File) PositionFor(p Pos, adjusted bool) (pos Position)
- func (f *File) SetLines(lines []int) bool
- func (f *File) SetLinesForContent(content []byte)
- func (f *File) Size() int
- type FileSet
- func (s *FileSet) AddFile(filename string, base, size int) *File
- func (s *FileSet) Base() int
- func (s *FileSet) File(p Pos) (f *File)
- func (s *FileSet) Iterate(f func(*File) bool)
- func (s *FileSet) Position(p Pos) (pos Position)
- func (s *FileSet) PositionFor(p Pos, adjusted bool) (pos Position)
- func (s *FileSet) Read(decode func(any) error) error
- func (s *FileSet) RemoveFile(file *File)
- func (s *FileSet) Write(encode func(any) error) error
- type Pos
- type Position
- type Token
Examples ¶
Constants ¶
const ( LowestPrec = 0 // non-operators UnaryPrec = 6 HighestPrec = 7 )
A set of constants for precedence-based expression parsing. Non-operators have lowest precedence, followed by operators starting with precedence 1 up to unary operators. The highest precedence serves as "catch-all" precedence for selector, indexing, and other operator and delimiter tokens.
Variables ¶
This section is empty.
Functions ¶
func IsExported ¶ added in go1.13
IsExported reports whether name starts with an upper-case letter.
func IsIdentifier ¶ added in go1.13
IsIdentifier reports whether name is a Go identifier, that is, a non-empty string made up of letters, digits, and underscores, where the first character is not a digit. Keywords are not identifiers.
Types ¶
type File ¶
type File struct {
// contains filtered or unexported fields
}
A File is a handle for a file belonging to a FileSet. A File has a name, size, and line offset table.
func (*File) AddLine ¶
AddLine adds the line offset for a new line. The line offset must be larger than the offset for the previous line and smaller than the file size; otherwise the line offset is ignored.
func (*File) AddLineColumnInfo ¶ added in go1.11
AddLineColumnInfo adds alternative file, line, and column number information for a given file offset. The offset must be larger than the offset for the previously added alternative line info and smaller than the file size; otherwise the information is ignored.
AddLineColumnInfo is typically used to register alternative position information for line directives such as //line filename:line:column.
func (*File) AddLineInfo ¶
AddLineInfo is like File.AddLineColumnInfo with a column = 1 argument. It is here for backward-compatibility for code prior to Go 1.11.
func (*File) Line ¶
Line returns the line number for the given file position p; p must be a Pos value in that file or NoPos.
func (*File) LineStart ¶ added in go1.12
LineStart returns the Pos value of the start of the specified line. It ignores any alternative positions set using File.AddLineColumnInfo. LineStart panics if the 1-based line number is invalid.
func (*File) Lines ¶ added in go1.21.0
Lines returns the effective line offset table of the form described by File.SetLines. Callers must not mutate the result.
func (*File) MergeLine ¶ added in go1.2
MergeLine merges a line with the following line. It is akin to replacing the newline character at the end of the line with a space (to not change the remaining offsets). To obtain the line number, consult e.g. [Position.Line]. MergeLine will panic if given an invalid line number.
func (*File) Offset ¶
Offset returns the offset for the given file position p.
If p is before the file's start position (or if p is NoPos), the result is 0; if p is past the file's end position, the result is the file size (see also go.dev/issue/57490).
The following invariant, though not true for offset values in general, holds for the result offset: f.Offset(f.Pos(offset)) == offset
func (*File) Pos ¶
Pos returns the Pos value for the given file offset.
If offset is negative, the result is the file's start position; if the offset is too large, the result is the file's end position (see also go.dev/issue/57490).
The following invariant, though not true for Pos values in general, holds for the result p: f.Pos(f.Offset(p)) == p.
func (*File) Position ¶
Position returns the Position value for the given file position p. If p is out of bounds, it is adjusted to match the File.Offset behavior. Calling f.Position(p) is equivalent to calling f.PositionFor(p, true).
func (*File) PositionFor ¶ added in go1.4
PositionFor returns the Position value for the given file position p. If p is out of bounds, it is adjusted to match the File.Offset behavior. If adjusted is set, the position may be adjusted by position-altering //line comments; otherwise those comments are ignored. p must be a Pos value in f or NoPos.
func (*File) SetLines ¶
SetLines sets the line offsets for a file and reports whether it succeeded. The line offsets are the offsets of the first character of each line; for instance for the content "ab\nc\n" the line offsets are {0, 3}. An empty file has an empty line offset table. Each line offset must be larger than the offset for the previous line and smaller than the file size; otherwise SetLines fails and returns false. Callers must not mutate the provided slice after SetLines returns.
func (*File) SetLinesForContent ¶
SetLinesForContent sets the line offsets for the given file content. It ignores position-altering //line comments.
type FileSet ¶
type FileSet struct {
// contains filtered or unexported fields
}
A FileSet represents a set of source files. Methods of file sets are synchronized; multiple goroutines may invoke them concurrently.
The byte offsets for each file in a file set are mapped into distinct (integer) intervals, one interval [base, base+size] per file. FileSet.Base represents the first byte in the file, and size is the corresponding file size. A Pos value is a value in such an interval. By determining the interval a Pos value belongs to, the file, its file base, and thus the byte offset (position) the Pos value is representing can be computed.
When adding a new file, a file base must be provided. That can be any integer value that is past the end of any interval of any file already in the file set. For convenience, FileSet.Base provides such a value, which is simply the end of the Pos interval of the most recently added file, plus one. Unless there is a need to extend an interval later, using the FileSet.Base should be used as argument for FileSet.AddFile.
A File may be removed from a FileSet when it is no longer needed. This may reduce memory usage in a long-running application.
func (*FileSet) AddFile ¶
AddFile adds a new file with a given filename, base offset, and file size to the file set s and returns the file. Multiple files may have the same name. The base offset must not be smaller than the FileSet.Base, and size must not be negative. As a special case, if a negative base is provided, the current value of the FileSet.Base is used instead.
Adding the file will set the file set's FileSet.Base value to base + size + 1 as the minimum base value for the next file. The following relationship exists between a Pos value p for a given file offset offs:
int(p) = base + offs
with offs in the range [0, size] and thus p in the range [base, base+size]. For convenience, File.Pos may be used to create file-specific position values from a file offset.
func (*FileSet) Base ¶
Base returns the minimum base offset that must be provided to FileSet.AddFile when adding the next file.
func (*FileSet) File ¶
File returns the file that contains the position p. If no such file is found (for instance for p == NoPos), the result is nil.
func (*FileSet) Iterate ¶
Iterate calls f for the files in the file set in the order they were added until f returns false.
func (*FileSet) Position ¶
Position converts a Pos p in the fileset into a Position value. Calling s.Position(p) is equivalent to calling s.PositionFor(p, true).
func (*FileSet) PositionFor ¶ added in go1.4
PositionFor converts a Pos p in the fileset into a Position value. If adjusted is set, the position may be adjusted by position-altering //line comments; otherwise those comments are ignored. p must be a Pos value in s or NoPos.
func (*FileSet) RemoveFile ¶ added in go1.20
RemoveFile removes a file from the FileSet so that subsequent queries for its Pos interval yield a negative result. This reduces the memory usage of a long-lived FileSet that encounters an unbounded stream of files.
Removing a file that does not belong to the set has no effect.
type Pos ¶
type Pos int
Pos is a compact encoding of a source position within a file set. It can be converted into a Position for a more convenient, but much larger, representation.
The Pos value for a given file is a number in the range [base, base+size], where base and size are specified when a file is added to the file set. The difference between a Pos value and the corresponding file base corresponds to the byte offset of that position (represented by the Pos value) from the beginning of the file. Thus, the file base offset is the Pos value representing the first byte in the file.
To create the Pos value for a specific source offset (measured in bytes), first add the respective file to the current file set using FileSet.AddFile and then call File.Pos(offset) for that file. Given a Pos value p for a specific file set fset, the corresponding Position value is obtained by calling fset.Position(p).
Pos values can be compared directly with the usual comparison operators: If two Pos values p and q are in the same file, comparing p and q is equivalent to comparing the respective source file offsets. If p and q are in different files, p < q is true if the file implied by p was added to the respective file set before the file implied by q.
type Position ¶
type Position struct {
Filename string // filename, if any
Offset int // offset, starting at 0
Line int // line number, starting at 1
Column int // column number, starting at 1 (byte count)
}
Position describes an arbitrary source position including the file, line, and column location. A Position is valid if the line number is > 0.
func (Position) String ¶
String returns a string in one of several forms:
file:line:column valid position with file name file:line valid position with file name but no column (column == 0) line:column valid position without file name line valid position without file name and no column (column == 0) file invalid position with file name - invalid position without file name
type Token ¶
type Token int
Token is the set of lexical tokens of the Go programming language.
const ( // Special tokens ILLEGAL Token = iota EOF COMMENT // Identifiers and basic type literals // (these tokens stand for classes of literals) IDENT // main INT // 12345 FLOAT // 123.45 IMAG // 123.45i CHAR // 'a' STRING // "abc" // Operators and delimiters ADD // + SUB // - MUL // * QUO // / REM // % AND // & OR // | XOR // ^ SHL // << SHR // >> AND_NOT // &^ ADD_ASSIGN // += SUB_ASSIGN // -= MUL_ASSIGN // *= QUO_ASSIGN // /= REM_ASSIGN // %= AND_ASSIGN // &= OR_ASSIGN // |= XOR_ASSIGN // ^= SHL_ASSIGN // <<= SHR_ASSIGN // >>= AND_NOT_ASSIGN // &^= LAND // && LOR // || ARROW // <- INC // ++ DEC // -- EQL // == LSS // < GTR // > ASSIGN // = NOT // ! NEQ // != LEQ // <= GEQ // >= DEFINE // := ELLIPSIS // ... LPAREN // ( LBRACK // [ LBRACE // { COMMA // , PERIOD // . RPAREN // ) RBRACK // ] RBRACE // } SEMICOLON // ; COLON // : // Keywords BREAK CASE CHAN CONST CONTINUE DEFAULT DEFER ELSE FALLTHROUGH FOR FUNC GO GOTO IF IMPORT INTERFACE MAP PACKAGE RANGE RETURN SELECT STRUCT SWITCH TYPE VAR // additional tokens, handled in an ad-hoc manner TILDE )
The list of tokens.
func (Token) IsKeyword ¶
IsKeyword returns true for tokens corresponding to keywords; it returns false otherwise.
func (Token) IsLiteral ¶
IsLiteral returns true for tokens corresponding to identifiers and basic type literals; it returns false otherwise.
func (Token) IsOperator ¶
IsOperator returns true for tokens corresponding to operators and delimiters; it returns false otherwise.
func (Token) Precedence ¶
Precedence returns the operator precedence of the binary operator op. If op is not a binary operator, the result is LowestPrecedence.
func (Token) String ¶
String returns the string corresponding to the token tok. For operators, delimiters, and keywords the string is the actual token character sequence (e.g., for the token ADD, the string is "+"). For all other tokens the string corresponds to the token constant name (e.g. for the token IDENT, the string is "IDENT").
Source Files