Documentation ¶
Overview ¶
Package scanner implements a scanner for gcfg configuration text. It takes a []byte as source which can then be tokenized through repeated calls to the Scan method.
Note that the API for the scanner package may change to accommodate new features or implementation changes in gcfg.
Index ¶
- func PrintError(w io.Writer, err error)
- type Error
- type ErrorHandler
- type ErrorList
- func (p *ErrorList) Add(pos token.Position, msg string)
- func (p ErrorList) Err() error
- func (p ErrorList) Error() string
- func (p ErrorList) Len() int
- func (p ErrorList) Less(i, j int) bool
- func (p *ErrorList) RemoveMultiples()
- func (p *ErrorList) Reset()
- func (p ErrorList) Sort()
- func (p ErrorList) Swap(i, j int)
- type Mode
- type Scanner
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func PrintError ¶
PrintError is a utility function that prints a list of errors to w, one error per line, if the err parameter is an ErrorList. Otherwise it prints the err string.
Types ¶
type Error ¶
In an ErrorList, an error is represented by an *Error. The position Pos, if valid, points to the beginning of the offending token, and the error condition is described by Msg.
type ErrorHandler ¶
An ErrorHandler may be provided to Scanner.Init. If a syntax error is encountered and a handler was installed, the handler is called with a position and an error message. The position points to the beginning of the offending token.
type ErrorList ¶
type ErrorList []*Error
ErrorList is a list of *Errors. The zero value for an ErrorList is an empty ErrorList ready to use.
func (ErrorList) Err ¶
Err returns an error equivalent to this error list. If the list is empty, Err returns nil.
func (*ErrorList) RemoveMultiples ¶
func (p *ErrorList) RemoveMultiples()
RemoveMultiples sorts an ErrorList and removes all but the first error per line.
type Scanner ¶
type Scanner struct { // public state - ok to modify ErrorCount int // number of errors encountered // contains filtered or unexported fields }
A Scanner holds the scanner's internal state while processing a given text. It can be allocated as part of another data structure but must be initialized via Init before use.
func (*Scanner) Init ¶
Init prepares the scanner s to tokenize the text src by setting the scanner at the beginning of src. The scanner uses the file set file for position information and it adds line information for each line. It is ok to re-use the same file when re-scanning the same file as line information which is already present is ignored. Init causes a panic if the file size does not match the src size.
Calls to Scan will invoke the error handler err if they encounter a syntax error and err is not nil. Also, for each error encountered, the Scanner field ErrorCount is incremented by one. The mode parameter determines how comments are handled.
Note that Init may call err if there is an error in the first character of the file.
func (*Scanner) Scan ¶
Scan scans the next token and returns the token position, the token, and its literal string if applicable. The source end is indicated by token.EOF.
If the returned token is a literal (token.IDENT, token.STRING) or token.COMMENT, the literal string has the corresponding value.
If the returned token is token.ILLEGAL, the literal string is the offending character.
In all other cases, Scan returns an empty literal string.
For more tolerant parsing, Scan will return a valid token if possible even if a syntax error was encountered. Thus, even if the resulting token sequence contains no illegal tokens, a client may not assume that no error occurred. Instead it must check the scanner's ErrorCount or the number of calls of the error handler, if there was one installed.
Scan adds line information to the file added to the file set with Init. Token positions are relative to that file and thus relative to the file set.
Example ¶
Output: 1:1 "[" "" 1:2 "IDENT" "profile" 1:10 "STRING" "\"A\"" 1:13 "]" "" 1:14 "\n" "" 2:1 "IDENT" "color" 2:7 "=" "" 2:9 "STRING" "blue" 2:14 "COMMENT" "; Comment"