blob: 323e7a14ee82206c22f997d745b7311d74f50988 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
package lexpr
import (
"strings"
)
const (
digits = "0123456789"
alpha = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM"
chars = "+-*/=<>@&|:!."
)
// scanNumber simplest scanner that accepts decimal int and float.
func scanNumber(l *lex) bool {
l.acceptWhile(digits, false)
if l.atStart() {
// not found any digit
return false
}
l.accept(".")
l.acceptWhile(digits, false)
return !l.atStart()
}
// scanWord returns true if next input token contains alphanum sequence that not starts from digit and not contains.
// spaces or special characters.
func scanWord(l *lex) bool {
if !l.accept(alpha) {
return false
}
l.acceptWhile(alpha+digits, false)
return true
}
func scanOps(l *lex) bool {
return l.acceptWhile(chars, false)
}
// scanQuotedString returns true if next input tokens is quoted string. Can be used with any type of quotes.
func scanQuotedString(l *lex, quote string) bool {
start := l.pos
if !strings.ContainsRune(quote, l.next()) {
l.pos = start
return false
}
if l.acceptWhileNot(quote, true) {
l.next()
}
return !l.atStart()
}
|
