40 lines
1.0 KiB
Go
40 lines
1.0 KiB
Go
package parser
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// Next retrieves the next parsed item.
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// When a valid item was found, then the boolean return parameter will be true.
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// On error or when successfully reaching the end of the input, false is returned.
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// When an error occurred, it will be set in the error return value, nil otherwise.
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func (l *Parser) Next() (Item, *Error, bool) {
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for {
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select {
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case i := <-l.items:
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switch {
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case i.Type == ItemEOF:
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return i, nil, false
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case i.Type == ItemError:
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l.err = &Error{i.Value, l.cursorRow, l.cursorColumn}
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return i, l.err, false
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default:
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l.item = i
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return i, nil, true
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}
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default:
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l.state = l.state(l)
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}
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}
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}
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// ToArray returns Parser items as an array (mainly intended for testing purposes)
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// When an error occurs during scanning, a partial result will be
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// returned, accompanied by the error that occurred.
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func (l *Parser) ToArray() ([]Item, *Error) {
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var items []Item
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for {
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item, err, more := l.Next()
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if !more {
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return items, err
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}
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items = append(items, item)
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}
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}
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