public static void generateParser(Grammar g, String target) throws FileNotFoundException {
g.prepareToGeneration();
PrintWriter out = new PrintWriter(target + "/Node.java");
// out.println("import Lexer;\n");
// out.println("package nodes;\n");
out.println("class Node {");
out.println("\tNode[] children;");
out.println("\tpublic String text;");
out.println("}");
out.close();
out = new PrintWriter(target + "/TerminalNode.java");
out.println(
"public class TerminalNode extends Node {\n\n"
+ "\tpublic TerminalNode(Lexer lx) {\n"
+ "\t\ttext = lx.getNext();\n"
+ "\t\tchildren = new Node[0];\n"
+ "\t}");
out.println("}");
out.close();
out = new PrintWriter(target + "/EpsNode.java");
out.println(
"public class EpsNode extends Node {\n\n"
+ "\tpublic EpsNode() {\n"
+ "\t\ttext = \"EPS\";\n"
+ "\t\tchildren = new Node[0];\n"
+ "\t}");
out.println("}");
out.close();
for (NonTerminal nt : g.nterms) {
out = new PrintWriter(target + "/" + nt.getName() + "Node.java");
out.println("import java.util.*;");
out.println("class " + nt.getName() + "Node extends Node {");
for (Attribute at : nt.atts) {
out.println("\tpublic " + at.type + " " + at.name + ";");
}
out.println();
out.println("\tpublic " + nt.getName() + "Node(Lexer lx) {");
for (Rule r : nt.rules) {
HashSet<String> good = new HashSet<String>();
if (r.getChildCount() == 0) {
good = nt.FOLLOW;
} else {
if (r.children.get(0).isTerminal()) {
good.add(r.children.get(0).getName());
} else {
good.addAll(((NonTerminal) (r.children.get(0))).FIRST);
}
}
out.print("\t\tif (");
boolean first = true;
if (r.getChildCount() == 0) {
out.print("lx.nextIsEOF");
first = false;
}
for (String t : good) {
if (!first) out.print(" || ");
first = false;
out.print("lx.nextIs" + t + "");
}
out.println(") {");
if (r.children.size() == 0) {
out.println("\t\t\tchildren = new Node[1];");
out.println("\t\t\tchildren[0] = new EpsNode();");
} else {
out.println("\t\t\tchildren = new Node[" + r.children.size() + "];");
for (int i = 0; i < r.children.size(); i++) {
Node n = r.children.get(i);
if (n.isTerminal()) {
out.println("\t\t\tchildren[" + i + "] = new TerminalNode(lx);");
} else {
out.println("\t\t\tchildren[" + i + "] = new " + n.getName() + "Node(lx);");
}
}
}
if (r.code != null) {
String outCode = r.code;
// System.err.println("--");
// System.err.println(outCode);
// System.err.println("@");
for (int i = 0; i < r.getChildCount(); i++) {
if (!r.children.get(i).isTerminal())
outCode =
outCode.replaceAll(
"_" + i, "((" + r.children.get(i).getName() + "Node)(children[" + i + "]))");
else outCode = outCode.replaceAll("_" + i, "children[" + i + "]");
}
// System.err.println(outCode);
out.println(outCode);
}
out.println("\t\t\treturn;");
out.println("\t\t}");
}
out.println("\t\tthrow new AssertionError(\"unexpected token :\" + lx.getNext());");
out.println("\t}");
out.println("}");
out.close();
}
}
