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comparison core/src/luan/modules/parsers/Csv.java @ 585:bb3818249dfb

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add Parsers
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 14 Aug 2015 06:35:20 -0600
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584:0742ac78fa69 585:bb3818249dfb
1 package luan.modules.parsers;
2
3 import luan.LuanTable;
4
5
6 public final class Csv {
7
8 public static LuanTable toList(String line) throws ParseException {
9 return new Csv(line).parse();
10 }
11
12 private final Parser parser;
13
14 private Csv(String line) {
15 this.parser = new Parser(line);
16 }
17
18 private ParseException exception(String msg) {
19 return new ParseException(parser,msg);
20 }
21
22 private LuanTable parse() throws ParseException {
23 LuanTable list = new LuanTable();
24 while(true) {
25 Spaces();
26 String field = parseField();
27 list.rawPut(list.rawLength()+1,field);
28 Spaces();
29 if( parser.endOfInput() )
30 return list;
31 if( !parser.match(',') )
32 throw exception("unexpected char");
33 }
34 }
35
36 private String parseField() throws ParseException {
37 parser.begin();
38 String rtn;
39 if( parser.match('"') ) {
40 int start = parser.currentIndex();
41 do {
42 if( parser.endOfInput() ) {
43 parser.failure();
44 throw exception("unclosed quote");
45 }
46 } while( parser.noneOf("\"") );
47 rtn = parser.textFrom(start);
48 parser.match('"');
49 } else {
50 int start = parser.currentIndex();
51 while( !parser.endOfInput() && parser.noneOf(",") );
52 rtn = parser.textFrom(start).trim();
53 }
54 return parser.success(rtn);
55 }
56
57 private void Spaces() {
58 while( parser.anyOf(" \t") );
59 }
60
61 }