private static Parser<Filter> query(Parser<Filter> atom) {
Parser.Reference<Filter> ref = Parser.newReference();
Parser<Filter> unit = ref.lazy().between(term("("), term(")")).or(atom);
Parser<Filter> parser =
new OperatorTable<Filter>()
.infixl(op(",", BinaryOperator.OR), 10)
.infixl(op("+", BinaryOperator.AND), 20)
.build(unit);
ref.set(parser);
return parser;
}
public static Filter parse(String source) {
/*
* String decoded = ""; char[] chars = source.toCharArray(); for (int i = 0; i < chars.length; i++) { if (chars[i] == '%') { int a = chars[++i]; int b = chars[++i]; if (a >= 'A') a = a-'A'; else a = a-'0'; if (b >= 'A') b = b-'A'; else b = b-'0'; decoded += (char)(16*a+b); } decoded += chars[i]; }
*/
source = source.replace("+", "%2B");
try {
source = URLDecoder.decode(source, "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
System.out.println(source);
return parser.parse(source);
}
public class QueryParser {
private enum BinaryOperator implements Binary<Filter> {
AND {
public Filter map(Filter a, Filter b) {
return new And(a, b);
}
},
OR {
public Filter map(Filter a, Filter b) {
return new Or(a, b);
}
}
}
public static final Parser<String> SINGLE_QUOTE_STRING =
Scanners.pattern(Patterns.regex("((\\\\.)|[^\'\\\\])*"), "quoted string")
.between(Scanners.isChar('\''), Scanners.isChar('\''))
.source();
public static final Map<String, String> SINGLE_QUOTE_STRING_MAP =
new Map<String, String>() {
public String map(String text) {
return text.substring(1, text.length() - 1).replace("\\'", "'");
}
@Override
public String toString() {
return "SINGLE_QUOTE_STRING";
}
};
private static final Parser<Filter> TOKEN =
Terminals.StringLiteral.PARSER.map(
new net.ion.rosetta.functors.Map<String, Filter>() {
public Token map(String s) {
return new Token(s);
}
});
private static final Terminals OPERATORS = Terminals.operators("+", ",", "(", ")");
private static final Parser<Object> TOKENIZER =
Parsers.<Object>or(SINGLE_QUOTE_STRING.map(SINGLE_QUOTE_STRING_MAP), OPERATORS.tokenizer());
private static Parser<?> term(String... names) {
return OPERATORS.token(names);
}
private static <T> Parser<T> op(String name, T value) {
return term(name).retn(value);
}
private static Parser<Filter> query(Parser<Filter> atom) {
Parser.Reference<Filter> ref = Parser.newReference();
Parser<Filter> unit = ref.lazy().between(term("("), term(")")).or(atom);
Parser<Filter> parser =
new OperatorTable<Filter>()
.infixl(op(",", BinaryOperator.OR), 10)
.infixl(op("+", BinaryOperator.AND), 20)
.build(unit);
ref.set(parser);
return parser;
}
private static Parser<Void> nodelim = Parsers.always();
private static final Parser<Filter> parser = query(TOKEN).from(TOKENIZER, nodelim);
public static Filter parse(String source) {
/*
* String decoded = ""; char[] chars = source.toCharArray(); for (int i = 0; i < chars.length; i++) { if (chars[i] == '%') { int a = chars[++i]; int b = chars[++i]; if (a >= 'A') a = a-'A'; else a = a-'0'; if (b >= 'A') b = b-'A'; else b = b-'0'; decoded += (char)(16*a+b); } decoded += chars[i]; }
*/
source = source.replace("+", "%2B");
try {
source = URLDecoder.decode(source, "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
System.out.println(source);
return parser.parse(source);
}
public static void main(String args[]) {
// System.out.println(SINGLE_QUOTE_STRING.parse("'foo'"));
System.out.println(QueryParser.parse("'hi: bye'+'ho!:bo+ o\\\'n'"));
}
}
