Documentation ¶
Overview ¶
Package token is variant of the stdlib package token with types FileSet and Token removed.
Index ¶
- 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) 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 Pos
- type Position
Constants ¶
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Variables ¶
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Functions ¶
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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 v1.1.0
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 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 v1.1.0
LineStart returns the Pos value of the start of the specified line. It ignores any alternative positions set using AddLineColumnInfo. LineStart panics if the 1-based line number is invalid.
func (*File) MergeLine ¶
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; p must be a valid Pos value in that file. f.Offset(f.Pos(offset)) == offset.
func (*File) Pos ¶
Pos returns the Pos value for the given file offset; the offset must be <= f.Size(). f.Pos(f.Offset(p)) == p.
func (*File) Position ¶
Position returns the Position value for the given file position p. Calling f.Position(p) is equivalent to calling f.PositionFor(p, true).
func (*File) PositionFor ¶
PositionFor returns the Position value for the given file position p. 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 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.
const NoPos Pos = 0
The zero value for Pos is NoPos; there is no file and line information associated with it, and NoPos.IsValid() is false. NoPos is always smaller than any other Pos value. The corresponding Position value for NoPos is the zero value for Position.
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