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