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parser: introduce SplitCommaArray to splits comma separated strings

removing whitespace and respecting quoted literals.

Signed-off-by: Alejandro Mery <amery@jpi.io>
pull/9/head
Alejandro Mery 11 months ago
parent
commit
d41cd781d9
  1. 88
      parser/comma_array.go

88
parser/comma_array.go

@ -0,0 +1,88 @@
package parser
import (
"strings"
"asciigoat.org/core/lexer"
)
type commaArrayParser struct {
TextParser
out []string
}
func (p *commaArrayParser) lexStart() (lexer.StateFn, error) {
for {
r, _, err := p.ReadRune()
switch {
case err != nil:
// EOF
return nil, err
case r == RuneQuotes:
// Quoted Value
return p.lexQuotedString, nil
case IsNewLine(r):
// new lines are acceptable when parsing a string for
// comma delimited arrays. but make sure we discard it
// complete
p.UnreadRune()
p.AcceptNewLine()
p.Discard()
case lexer.IsSpace(r):
// discard whitespace outside quotes
p.Discard()
default:
p.UnreadRune()
return p.lexWord, nil
}
}
}
func (p *commaArrayParser) lexWord() (lexer.StateFn, error) {
for {
r, _, err := p.ReadRune()
switch {
case err != nil:
// done. store what we got and move on
_, s := p.Emit()
p.out = append(p.out, s)
return nil, err
case r == ',':
// done
_, s := p.Emit()
// remove comma, trim and append to output
s = strings.TrimRightFunc(s[:len(s)-1], IsSpace)
p.out = append(p.out, s)
return p.lexStart, nil
}
}
}
func (p *commaArrayParser) lexQuotedString() (lexer.StateFn, error) {
s, err := lexQuotedString(&p.TextParser)
if err != nil {
return nil, err
}
p.Discard()
p.out = append(p.out, s)
return p.lexStart, nil
}
func (p *commaArrayParser) Run() ([]string, error) {
err := lexer.Run(p.lexStart)
return p.out, err
}
// SplitCommaArray splits comma separated strings, removing whitespace
// and respecting quoted literals.
func SplitCommaArray(s string) ([]string, error) {
if s != "" {
var p commaArrayParser
p.InitString(s)
return p.Run()
}
return nil, nil
}
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