49 lines
1.3 KiB
Go
49 lines
1.3 KiB
Go
package lexer
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import "fmt"
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// itemType represents the type of lexer items.
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type itemType int
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// Definition of all the lexer item types for the TOML lexer.
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const (
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ItemError itemType = iota // An error occurred
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ItemEOF // End of input reached
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ItemComment // Comment string, starts with # till en of line
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ItemKey // Key of a key/value pair
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ItemKeyDot // Dot for a dotted key
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ItemAssignment // Value assignment coming up (=)
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ItemString // A value of type string
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)
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// Item represents a lexer item returned from the scanner.
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type Item struct {
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Type itemType //Type, e.g. ItemComment, ItemString
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Value string // Value, e.g. "10.42", "["
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}
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// String returns a string representation of the lexer item.
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func (i Item) String() string {
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switch i.Type {
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case ItemKey:
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return fmt.Sprintf("[%s]", i.Value)
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case ItemKeyDot:
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return "."
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case ItemAssignment:
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return "="
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}
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return fmt.Sprintf("%s(%s)", i.Type, i.Value)
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}
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// String returns a string representation of the lexer item type.
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func (i itemType) String() string {
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switch i {
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case ItemComment:
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return "#"
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case ItemString:
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return "STR"
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default:
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panic(fmt.Sprintf("No translation available for type id %d", i))
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}
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}
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