private int lbp(Token tk) {
if (tk.type == Token.Type.NAME) {
return 90;
} else if (tk.type == Token.Type.NUM) {
return 90;
}
Integer res = LBP.get(tk.text);
if (res == null) {
System.err.println(tab(depth) + "warn " + tk);
return 0;
} else {
return res;
}
}
public static void main(String[] args) throws Exception {
LBP.put("=", 7);
LBP.put("and", 5);
LBP.put("or", 5);
LBP.put("<", 7);
LBP.put(">", 7);
LBP.put("+", 10);
LBP.put("-", 10);
LBP.put("*", 20);
LBP.put("/", 20);
LBP.put("(", 100);
LBP.put(")", 1);
PrattParser p = new PrattParser();
p.debug = true;
Reader reader = (new StringReader("-a * -b"));
p.lexer = new LookaheadLexerWrapper(new StructuredLexer(new BaseLexer(reader), " "));
// p.advance();
Expr ast = p.expr(0);
System.out.println(ast);
}