import java.lang.reflect.*;
import java.io.*;
+/** The java classes typically used to represent a parsed grammar AST */
public class MetaGrammarBindings {
- public static @bind class Grammar {
- public NonTerminal get(String s) {
- for(NonTerminal nt : nonterminals)
- if (nt.name.equals(s)) return nt;
- return null;
- }
- public @bind.arg NonTerminal[] nonterminals;
+
+ /** A grammar (a set of nonterminals) */
+ public static class Grammar extends HashMap<String,NonTerminal> {
+ public @bind Grammar(NonTerminal[] nonterminals) {
+ for(NonTerminal nt : nonterminals) this.put(nt.name, nt); }
public String toString() {
String ret = "[ ";
- for(NonTerminal nt : nonterminals) ret += nt + ", ";
+ for(NonTerminal nt : values()) ret += nt + ", ";
return ret + " ]";
}
}
+
public abstract static class Un extends El {
public Seq[][] sequences;
public void build(MetaGrammar.Context cx, Union u) {
}
}
}
+
public static class NonTerminal extends Un {
public String name = null;
public @bind NonTerminal(@bind.arg String name,
}
}
- //public static @bind.as void range(char c) { }
public static class Range {
- public @bind.as("range") Range(char only) { first = only; last = only; }
- public @bind.as("-") Range(char first, char last) { this.first = first; this.last = last; }
+ public @bind Range(char only) { first = only; last = only; }
+ public @bind Range(char first, char last) { this.first = first; this.last = last; }
public char first;
public char last;
}
public static @bind.as("/") Seq slash(Seq s, El e) { return s.separate(e); }
public static @bind.as("ps") Seq seq(El[] elements) { return new Seq(elements); }
+ // public static @bind.as("PreSequence") Seq seq2(El[] elements) { return new Seq(elements); }
public static @bind.as Seq psx(Seq s) { return s; }
public static @bind.as(":") El colon(String s, El e) { return new Label(s, e); }
public static @bind.as(")") void close(String foo) { throw new Error("not supported"); }
public static @bind.as("()") El epsilon() { return new Constant(Union.epsilon); }
- public static @bind.as("nonTerminal") class NonTerminalReference extends El {
+ public static @bind class NonTerminalReference extends El {
public @bind.arg String nonTerminal;
- public Element build(MetaGrammar.Context cx) {
- return cx.get(nonTerminal);
- }
+ public Element build(MetaGrammar.Context cx) { return cx.get(nonTerminal); }
}
- public static class StringLiteral extends Constant {
- public @bind.as("literal") StringLiteral(String string) { super(CharRange.string(string)); }
+ public static class Literal extends Constant {
+ public @bind Literal(@bind.arg String string) { super(CharRange.string(string)); }
public boolean drop() { return true; }
}