Documentation
¶
Index ¶
- Constants
- func Parse(input io.Reader) (rs *ast.RuleSet, err error)
- func YYmain(filenames ...string) (interface{}, error)
- type Scanner
- func (yy *Scanner) Input() (byte, error)
- func (yy *Scanner) Lex() YYtype
- func (yy *Scanner) NewFile()
- func (yy *Scanner) Restart(input_file io.Reader)
- func (s *Scanner) Token(tokenType int) YYtype
- func (s *Scanner) TokenFloat64(tokenType int, v float64) YYtype
- func (s *Scanner) TokenHexString(hexTokens []ast.HexToken) YYtype
- func (s *Scanner) TokenInt64(tokenType int, v int64) YYtype
- func (s *Scanner) TokenRegExp(reg *ast.LiteralRegexp) YYtype
- func (s *Scanner) TokenString(tokenType int, v string) YYtype
- type YYcontext
- type YYtype
Constants ¶
View Source
const ( ModGlobal modifiers = 1 << iota ModPrivate ModASCII ModWide ModXor ModFullword ModNocase ModBase64 ModBase64Wide )
View Source
const COMMENT = 3
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const REGEXP = 2
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const STR = 1
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const UNARY_MINUS = 57407
Variables ¶
This section is empty.
Functions ¶
Types ¶
type Scanner ¶
type Scanner struct {
In io.Reader
Out io.Writer
Lineno int
Filename string
Wrap func(*Scanner) bool
IsInteractive func(io.Reader) bool
Context YYcontext
Interactive bool
// contains filtered or unexported fields
}
func NewScanner ¶
func NewScanner() *Scanner
func (*Scanner) Restart ¶
* Immediately switch to a different input stream.
- @param input_file A readable stream. *
- @note This function does not reset the start condition to @c yyInitial .
func (*Scanner) Token ¶ added in v0.4.0
Token creates a YYtype struct for the given token type with no associated value.
func (*Scanner) TokenFloat64 ¶ added in v0.5.4
func (*Scanner) TokenHexString ¶ added in v0.4.0
func (*Scanner) TokenInt64 ¶ added in v0.4.0
func (*Scanner) TokenRegExp ¶ added in v0.4.0
func (s *Scanner) TokenRegExp(reg *ast.LiteralRegexp) YYtype
type YYtype ¶
type YYtype struct {
Token int // One of the constants defined in grammar.y via the %token directive.
Lineno int // Line number where the token is found.
StartPos int // Position within the parsed source code where the token starts (inclusive).
EndPos int // Position within the parsed source code where the token ends (exclusive).
Value *yrSymType // Value associated with the toke.
Error gyperror.Error
}
YYtype is a structure that represents a token. The lexer/scanner returns an instance of this structure every time parser asks for the next token. Each token may have an associated value, for example, the _IDENTIFIER_ token has an associated string with the identifier's name. If the lexer/scanner wants to return an error to the parser it sets the Error field and leaves the Token and Value empty. This structure also stores information about the token's position within the original source code.
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