1 package edu.berkeley.sbp.meta;
2 import edu.berkeley.sbp.util.*;
3 import edu.berkeley.sbp.*;
4 import edu.berkeley.sbp.chr.*;
5 import edu.berkeley.sbp.misc.*;
6 import edu.berkeley.sbp.bind.*;
8 import java.lang.annotation.*;
9 import java.lang.reflect.*;
12 /** The java classes typically used to represent a parsed grammar AST */
13 public class MetaGrammarBindings {
14 public static class Grammar extends HashMap<String,NonTerminal> {
15 public @bind Grammar(NonTerminal[] nonterminals) {
16 for(NonTerminal nt : nonterminals) this.put(nt.name, nt); }
17 public String toString() {
19 for(NonTerminal nt : values()) ret += nt + ", ";
23 public abstract static class Un extends El {
24 public Seq[][] sequences;
25 public void build(MetaGrammar.Context cx, Union u) {
26 HashSet<Sequence> bad2 = new HashSet<Sequence>();
27 for(int i=0; i<sequences.length; i++) {
28 Seq[] group = sequences[i];
29 Union u2 = new Union();
30 if (sequences.length==1) u2 = u;
31 for(int j=0; j<group.length; j++) {
32 group[j].build(cx, u2, false);
34 if (sequences.length==1) break;
35 Sequence seq = Sequence.singleton(u2);
36 for(Sequence s : bad2) {
41 bad2.add(Sequence.singleton(u2));
45 public static class NonTerminal extends Un {
46 public String name = null;
47 public @bind NonTerminal(@bind.arg String name,
48 @bind.arg Seq[][] sequences) {
50 this.sequences = sequences;
52 public Element build(MetaGrammar.Context cx) { return cx.get(name); }
55 public static class AnonUn extends Un {
56 public @bind.as("(") AnonUn(Seq[][] sequences) {
57 this.sequences = sequences;
59 public Element build(MetaGrammar.Context cx) {
60 Union ret = new Union();
66 //public static @bind.as void range(char c) { }
67 public static class Range {
68 public @bind.as("range") Range(char only) { first = only; last = only; }
69 public @bind.as("-") Range(char first, char last) { this.first = first; this.last = last; }
73 public static abstract class El {
74 public String getLabel() { return null; }
75 public String getOwnerTag() { return null; }
76 public boolean drop() { return false; }
77 public abstract Element build(MetaGrammar.Context cx);
79 public static class Drop extends El {
81 public Drop(El e) { this.e = e; }
82 public String getLabel() { return null; }
83 public boolean drop() { return true; }
84 public String getOwnerTag() { return e.getOwnerTag(); }
85 public Element build(MetaGrammar.Context cx) { return e.build(cx); }
87 public static class Label extends El {
90 public Label(String label, El e) { this.e = e; this.label = label; }
91 public String getLabel() { return label; }
92 public String getOwnerTag() { return e.getOwnerTag(); }
93 public Element build(MetaGrammar.Context cx) { return e.build(cx); }
95 public static /*abstract*/ class Seq {
96 HashSet<Seq> and = new HashSet<Seq>();
97 HashSet<Seq> not = new HashSet<Seq>();
102 public Seq(El e) { this(new El[] { e }); }
103 public Seq(El[] elements) { this.elements = elements; }
104 public Seq tag(String tag) { this.tag = tag; return this; }
105 public Seq follow(El follow) { this.follow = follow; return this; }
107 Seq ret = new Seq(elements);
114 public Seq and(Seq s) { and.add(s); s.lame = true; return this; }
115 public Seq andnot(Seq s) { not.add(s); s.lame = true; return this; }
116 public Seq separate(El sep) {
117 El[] elements = new El[this.elements.length * 2 - 1];
118 for(int i=0; i<this.elements.length; i++) {
119 elements[i*2] = this.elements[i];
120 if (i<this.elements.length-1)
121 elements[i*2+1] = new Drop(sep);
123 this.elements = elements;
126 public Sequence build(MetaGrammar.Context cx, Union u, boolean lame) {
127 Sequence ret = build0(cx, lame || this.lame);
128 for(Seq s : and) { Sequence dork = s.build(cx, u, true); ret = ret.and(dork); }
129 for(Seq s : not) { Sequence dork = s.build(cx, u, true); ret = ret.not(dork); }
134 public Sequence build0(MetaGrammar.Context cx, boolean lame) {
135 boolean unwrap = false;
136 boolean dropAll = lame;
137 if (tag!=null && tag.equals("[]")) unwrap = true;
138 if (tag!=null && "()".equals(tag)) dropAll = true;
139 Object[] labels = new Object[elements.length];
140 boolean[] drops = new boolean[elements.length];
141 Element[] els = new Element[elements.length];
142 for(int i=0; i<elements.length; i++) {
143 labels[i] = elements[i].getLabel();
144 drops[i] = elements[i].drop();
145 els[i] = elements[i].build(cx);
146 if (elements[i].getOwnerTag() != null)
147 tag = elements[i].getOwnerTag();
150 if (dropAll) ret = Sequence.drop(els, false);
151 else if (unwrap) ret = Sequence.unwrap(els, cx.rm.repeatTag(), drops);
152 else if (tag!=null) {
153 ret = cx.rm.resolveTag(tag, cx.cnt, els, labels, drops);
155 ret = cx.rm.tryResolveTag(tag, cx.cnt, els, labels, drops);
158 for(int i=0; i<els.length; i++)
160 if (idx==-1) idx = i;
161 else throw new Error("multiple non-dropped elements in sequence: " + Sequence.drop(els,false));
162 if (idx != -1) ret = Sequence.singleton(els, idx);
163 else ret = Sequence.drop(els, false);
166 if (this.follow != null)
167 ret.follow = infer(this.follow.build(cx));
168 ret.lame = this.lame;
172 public static @bind.as("&") Seq and(Seq s, El[] elements) { return s.and(seq(elements)); }
173 public static @bind.as("&~") Seq andnot(Seq s, El[] elements) { return s.andnot(seq(elements)); }
174 public static @bind.as("->") Seq arrow(Seq s, El e) { return s.follow(e); }
175 public static @bind.as("::") Seq tag(String tagname, Seq s) { return s.tag(tagname); }
176 public static @bind.as("/") Seq slash(Seq s, El e) { return s.separate(e); }
178 public static @bind.as("ps") Seq seq(El[] elements) { return new Seq(elements); }
179 public static @bind.as Seq psx(Seq s) { return s; }
180 public static @bind.as(":") El colon(String s, El e) { return new Label(s, e); }
181 public static @bind.as(")") void close(String foo) { throw new Error("not supported"); }
182 public static @bind.as("()") El epsilon() { return new Constant(Union.epsilon); }
184 public static @bind.as("nonTerminal") class NonTerminalReference extends El {
185 public @bind.arg String nonTerminal;
186 public Element build(MetaGrammar.Context cx) {
187 return cx.get(nonTerminal);
191 public static class StringLiteral extends Constant {
192 public @bind.as("literal") StringLiteral(String string) { super(CharRange.string(string)); }
193 public boolean drop() { return true; }
196 public static class CharClass extends El {
198 public @bind.as("[") CharClass(Range[] ranges) { this.ranges = ranges; }
199 public Element build(MetaGrammar.Context cx) {
200 edu.berkeley.sbp.util.Range.Set set = new edu.berkeley.sbp.util.Range.Set();
201 for(Range r : ranges)
202 set.add(r.first, r.last);
203 return CharRange.set(set);
207 public static @bind.as("{") class XTree extends El {
208 public @bind.arg Seq body;
209 public Element build(MetaGrammar.Context cx) {
214 public static class Rep extends El {
216 public boolean zero, many, max;
217 public Rep(El e, El sep, boolean zero, boolean many, boolean max) {
218 this.e = e; this.sep = sep; this.zero = zero; this.many = many; this.max = max;}
219 public Element build(MetaGrammar.Context cx) {
221 ? Sequence.repeat(e.build(cx), zero, many, sep==null ? null : sep.build(cx), cx.rm.repeatTag())
223 ? Sequence.repeatMaximal(infer(e.build(cx)), zero, many, cx.rm.repeatTag())
224 : Sequence.repeatMaximal(e.build(cx), zero, many, infer(sep.build(cx)), cx.rm.repeatTag());
227 public static class Constant extends El {
229 public Constant(Element constant) { this.constant = constant; }
230 public Element build(MetaGrammar.Context cx) { return constant; }
232 public abstract static class PostProcess extends El {
234 public PostProcess(El e) { this.e = e; }
235 public Element build(MetaGrammar.Context cx) { return postProcess(e.build(cx)); }
236 public abstract Element postProcess(Element e);
239 // FIXME: it would be nice if we could hoist this into "Rep"
240 public static @bind.as("++") El plusmax(final El e) { return new Rep(e, null, false, true, true); }
241 public static @bind.as("+") El plus(final El e) { return new Rep(e, null, false, true, false); }
242 public static @bind.as("++/") El plusmaxfollow(final El e, final El sep) { return new Rep(e, sep, false, true, true); }
243 public static @bind.as("+/") El plusfollow(final El e, final El sep) { return new Rep(e, sep, false, true, false); }
244 public static @bind.as("**") El starmax(final El e) { return new Rep(e, null, true, true, true); }
245 public static @bind.as("*") El star(final El e) { return new Rep(e, null, true, true, false); }
246 public static @bind.as("**/") El starmaxfollow(final El e, final El sep) { return new Rep(e, sep, true, true, true); }
247 public static @bind.as("*/") El starfollow(final El e, final El sep) { return new Rep(e, sep, true, true, false); }
248 public static @bind.as("?") El question(final El e) { return new Rep(e, null, true, true, false); }
250 public static @bind.as("!") El bang(final El e) { return new Drop(e); }
252 public static @bind.as("^") El caret(final String s) {
253 return new Drop(new Constant(CharRange.string(s)) {
254 public String getOwnerTag() { return s; }
258 public static @bind.as("~") El tilde(final El e) {
259 return new PostProcess(e) {
260 public Element postProcess(Element e) {
261 return infer((Topology<Character>)Atom.toAtom(e).complement());
264 public static @bind.as("^^") void doublecaret(final El e) { throw new Error("not implemented"); }
266 //public static @bind.as("(") El subexpression(Seq[][] rhs) { return new NonTerminal(rhs); }
268 public static @bind.as("Word") String word(String s) { return s; }
269 public static @bind.as("Quoted") String quoted(String s) { return s; }
270 public static @bind.as("escaped") String c(char c) { return c+""; }
271 public static @bind.as("\"\"") String emptystring() { return ""; }
272 public static @bind.as("\n") String retur() { return "\n"; }
273 public static @bind.as("\r") String lf() { return "\r"; }
275 static Atom infer(Element e) { return infer((Topology<Character>)Atom.toAtom(e)); }
276 static Atom infer(Topology<Character> t) { return new CharRange(new CharTopology(t)); }