91 lines
2.6 KiB
Go
91 lines
2.6 KiB
Go
// Copyright (c) 2017 Ernest Micklei
|
|
//
|
|
// MIT License
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining
|
|
// a copy of this software and associated documentation files (the
|
|
// "Software"), to deal in the Software without restriction, including
|
|
// without limitation the rights to use, copy, modify, merge, publish,
|
|
// distribute, sublicense, and/or sell copies of the Software, and to
|
|
// permit persons to whom the Software is furnished to do so, subject to
|
|
// the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be
|
|
// included in all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
package proto
|
|
|
|
import (
|
|
"fmt"
|
|
"strconv"
|
|
)
|
|
|
|
// Range is to specify number intervals (with special end value "max")
|
|
type Range struct {
|
|
From, To int
|
|
Max bool
|
|
}
|
|
|
|
// SourceRepresentation return a single number if from = to. Returns <from> to <to> otherwise unless Max then return <from> to max.
|
|
func (r Range) SourceRepresentation() string {
|
|
if r.Max {
|
|
return fmt.Sprintf("%d to max", r.From)
|
|
}
|
|
if r.From == r.To {
|
|
return strconv.Itoa(r.From)
|
|
}
|
|
return fmt.Sprintf("%d to %d", r.From, r.To)
|
|
}
|
|
|
|
// parseRanges is used to parse ranges for extensions and reserved
|
|
func parseRanges(p *Parser, n Visitee) (list []Range, err error) {
|
|
seenTo := false
|
|
for {
|
|
pos, tok, lit := p.next()
|
|
if isString(lit) {
|
|
return list, p.unexpected(lit, "integer, <to> <max>", n)
|
|
}
|
|
switch lit {
|
|
case ",":
|
|
case "to":
|
|
seenTo = true
|
|
case ";":
|
|
p.nextPut(pos, tok, lit) // allow for inline comment parsing
|
|
goto done
|
|
case "max":
|
|
if !seenTo {
|
|
return list, p.unexpected(lit, "to", n)
|
|
}
|
|
from := list[len(list)-1]
|
|
list = append(list[0:len(list)-1], Range{From: from.From, Max: true})
|
|
default:
|
|
// must be number
|
|
i, err := strconv.Atoi(lit)
|
|
if err != nil {
|
|
return list, p.unexpected(lit, "range integer", n)
|
|
}
|
|
if seenTo {
|
|
// replace last two ranges with one
|
|
if len(list) < 1 {
|
|
p.unexpected(lit, "integer", n)
|
|
}
|
|
from := list[len(list)-1]
|
|
list = append(list[0:len(list)-1], Range{From: from.From, To: i})
|
|
seenTo = false
|
|
} else {
|
|
list = append(list, Range{From: i, To: i})
|
|
}
|
|
}
|
|
}
|
|
done:
|
|
return
|
|
}
|