X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2Fmisc%2FMetaGrammar.java;h=53aeff098f231c99e8310f3a090a4b5c3f8719fe;hp=9381aa0d0fb559d1faa1f2aaa7877cca595bfa93;hb=3485f1c89ae352b5aa1b65cdfa5f628cd3859601;hpb=ae49c84428d77798ddeedf4c7e6329799f0633e7 diff --git a/src/edu/berkeley/sbp/misc/MetaGrammar.java b/src/edu/berkeley/sbp/misc/MetaGrammar.java index 9381aa0..53aeff0 100644 --- a/src/edu/berkeley/sbp/misc/MetaGrammar.java +++ b/src/edu/berkeley/sbp/misc/MetaGrammar.java @@ -25,20 +25,40 @@ public class MetaGrammar extends ReflectiveWalker { public static Union epsilon = new Union("()"); static { epsilon.add(Sequence.empty); } + //////////////////////////////////////////////////////////////////////////////// + + private Union g; + private HashMap nt; + private int anon = 0; + private Element dws; + private String startSymbol; + + public MetaGrammar() { this("s"); } + public MetaGrammar(String s) { done(s); } + public Union done() { return done("s"); } + public Union done(String str) { + Union ret = g; + g = new Union(str); + startSymbol = str; + nt = new HashMap(); + dropAll = new HashSet(); + nt.put(str, g); + this.dws = Repeat.maximal(Repeat.many0(nonTerminal("w"))); + return ret; + } // MetaGrammar ////////////////////////////////////////////////////////////////////////////// - public Object _star_(Element r) { return new Rep(r, null, false, true); } - public Element epsilon(Object o, Object b) { return epsilon; } - public Element _rightparen_(Object e) { return SELF; } public PreSequence _amp_(PreSequence p, Object[] o) { return p.and(new PreSequence(o, null, true).buildSequence(null, true, false)); } public PreSequence _amp__tilde_(PreSequence p, Object[] o) { return p.not(new PreSequence(o, null, true).buildSequence(null, true, false)); } - - public Element _bang_(Element r) { return r; } - public Object care(String s) { return new MyLift(s); } - public Object _caret_(String s) { return new MyLift(s); } - public Object _leftparen__rightparen_() { return epsilon; } - + public PreSequence rewrite(Object[] o) { return new PreSequence(o, null); } + public PreSequence _equals__greater_(Object[] o, String s) { return new PreSequence(o, s); } + public Object _star_(Element r) { return Repeat.many0(r); } + public Element epsilon(Object o, Object b) { return epsilon; } + public Element _rightparen_(Object e) { return SELF; } + public Element _bang_(Element r) { return r; } + public Object _caret_(String s) { return new MyLift(s); } + public Object _leftparen__rightparen_() { return epsilon; } public Union nonTerminal(String s) { return nonTerminal(s, null, false, false); } public Union _colon__colon__equals_(String s, PreSequence[][] p) { return nonTerminal(s, p, false, false); } public Union _bang__colon__colon__equals_(String s, PreSequence[][] p) { return nonTerminal(s, p, false, true); } @@ -67,7 +87,7 @@ public class MetaGrammar extends ReflectiveWalker { public Object _backslash__leftbrace_(String s) { return SELF; } public Object _leftbrace_(String s) { return SELF; } - public Object _plus_(final Element r) { return new Rep(r, null, false, false); } + public Object _plus_(final Element r) { return Repeat.many1(r); } public Object[] _slash_(Object[] o, Object sep) { if (o.length <= 1) return o; Object[] ret = new Object[o.length * 2 - 1]; @@ -78,10 +98,11 @@ public class MetaGrammar extends ReflectiveWalker { } return ret; } - public Object _plus__slash_(final Element r, Object s) { return new Rep(r, (Element)s, false, false); } - public Object _star__slash_(final Element r, Object s) { return new Rep(r, (Element)s, false, true); } - public Object _star__star_(final Element r) { return new Rep(r, null, true, true); } - public Object _plus__plus_(final Element r) { return new Rep(r, null, true, false); } + + public Object _plus__slash_(final Element r, Element s) { return Repeat.many1(r, s); } + public Object _star__slash_(final Element r, Element s) { return Repeat.many0(r, s); } + public Object _star__star_(final Element r) { return Repeat.maximal(Repeat.many0(r)); } + public Object _plus__plus_(final Element r) { return Repeat.maximal(Repeat.many1(r)); } public Element _question_(final Element r) { return Repeat.maybe(r); } public MetaGrammar gram(Object o, MetaGrammar g, Object o2) { return g; } public MetaGrammar grammar(Object[] o) { return this; } @@ -102,61 +123,13 @@ public class MetaGrammar extends ReflectiveWalker { return CharToken.set(ret); } - - //////////////////////////////////////////////////////////////////////////////// - - private Union g; - private HashMap nt; - private int anon = 0; - private Element dws; - private String startSymbol; - - public MetaGrammar() { this("s"); } - public MetaGrammar(String s) { done(s); } - public Union done() { return done("s"); } - public Union done(String str) { - Union ret = g; - g = new Union(str); - startSymbol = str; - nt = new HashMap(); - dropAll = new HashSet(); - nt.put(str, g); - this.dws = Repeat.maximal(Repeat.many0(nonTerminal("w"))); - return ret; - } - - public String stringify(String s) { return StringUtil.unescapify(s); } - public char unescape(char x, char c) { return unescape(c); } - public char unescape(char c) { return StringUtil.unescapify("\\"+c).charAt(0); } - public PreSequence sequence(Object[] o) { return new PreSequence(o, null); } - - public PreSequence _equals__greater_(Object[] o, String s) { return new PreSequence(o, s); } - public PreSequence wrap(Object[] o) { return new PreSequence(o, ""); } - public PreSequence mwrap(Object[] o) { return new PreSequence(o, ""); } - public PreSequence rewrite(Object[] o) { return new PreSequence(o, null); } - public PreSequence rewrite(Object[] o, Object o2) { - Object[] o3 = new Object[o.length + 1]; - System.arraycopy(o, 0, o3, 0, o.length); - o3[o3.length-1] = o2; - return rewrite(o3); - } - - public static class PreBrace { - public final Object[] o; - public PreBrace(Object[] o) { this.o = o; } + public static class MyLift { + public final String s; + public MyLift(String s) { this.s = s; } } - - public static class Rep { - private final Element e; - private final Element s; - private final boolean maximal; - private final boolean zero; - public Rep(Element e, Element s, boolean maximal, boolean zero) { this.e = e; this.s = s; this.zero = zero; this.maximal = maximal;} - public Element build() { - Element sep = s; - Element ret = zero ? Repeat.many0(e, sep) : Repeat.many1(e, sep); - return maximal ? Repeat.maximal(ret) : ret; - } + public static class MyDrop { + public final Object o; + public MyDrop(Object o) { this.o = o; } } public static class PreSequence { @@ -171,27 +144,6 @@ public class MetaGrammar extends ReflectiveWalker { public PreSequence(Object[] o, String tag) { this(o, tag, false); } public PreSequence(Object[] o, String tag, boolean keeper) { this.o = o; this.tag = tag; this.keeper = keeper; } boolean[] drops = null; - public Element[] expand(Union u, HashSet set) { - if (o==null) return new Element[0]; - Element[] o2 = new Element[o.length]; - drops = new boolean[o.length]; - int j = 0; - for(int i=0; i set = new HashSet(); - Element[] expansion = expand(u, set); + Element[] o2 = o==null ? new Element[0] : new Element[o.length]; + if (o != null) { + drops = new boolean[o.length]; + int j = 0; + for(int i=0; i