/**
* Copyright (c) Rich Hickey. All rights reserved.
* The use and distribution terms for this software are covered by the
* Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
* which can be found in the file epl-v10.html at the root of this distribution.
* By using this software in any fashion, you are agreeing to be bound by
* the terms of this license.
* You must not remove this notice, or any other, from this software.
**/
package clojure.lang;
import java.io.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.math.BigInteger;
import java.math.BigDecimal;
import java.lang.*;
public class LispReader{
static final Symbol QUOTE = Symbol.create("quote");
static final Symbol THE_VAR = Symbol.create("var");
//static Symbol SYNTAX_QUOTE = Symbol.create(null, "syntax-quote");
static Symbol UNQUOTE = Symbol.create("clojure.core", "unquote");
static Symbol UNQUOTE_SPLICING = Symbol.create("clojure.core", "unquote-splicing");
static Symbol CONCAT = Symbol.create("clojure.core", "concat");
static Symbol SEQ = Symbol.create("clojure.core", "seq");
static Symbol LIST = Symbol.create("clojure.core", "list");
static Symbol APPLY = Symbol.create("clojure.core", "apply");
static Symbol HASHMAP = Symbol.create("clojure.core", "hash-map");
static Symbol HASHSET = Symbol.create("clojure.core", "hash-set");
static Symbol VECTOR = Symbol.create("clojure.core", "vector");
static Symbol WITH_META = Symbol.create("clojure.core", "with-meta");
static Symbol META = Symbol.create("clojure.core", "meta");
static Symbol DEREF = Symbol.create("clojure.core", "deref");
//static Symbol DEREF_BANG = Symbol.create("clojure.core", "deref!");
static IFn[] macros = new IFn[256];
static IFn[] dispatchMacros = new IFn[256];
//static Pattern symbolPat = Pattern.compile("[:]?([\\D&&[^:/]][^:/]*/)?[\\D&&[^:/]][^:/]*");
static Pattern symbolPat = Pattern.compile("[:]?([\\D&&[^/]].*/)?([\\D&&[^/]][^/]*)");
//static Pattern varPat = Pattern.compile("([\\D&&[^:\\.]][^:\\.]*):([\\D&&[^:\\.]][^:\\.]*)");
//static Pattern intPat = Pattern.compile("[-+]?[0-9]+\\.?");
static Pattern intPat =
Pattern.compile(
"([-+]?)(?:(0)|([1-9][0-9]*)|0[xX]([0-9A-Fa-f]+)|0([0-7]+)|([1-9][0-9]?)[rR]([0-9A-Za-z]+)|0[0-9]+)");
static Pattern ratioPat = Pattern.compile("([-+]?[0-9]+)/([0-9]+)");
static Pattern floatPat = Pattern.compile("([-+]?[0-9]+(\\.[0-9]*)?([eE][-+]?[0-9]+)?)(M)?");
static final Symbol SLASH = Symbol.create("/");
static final Symbol CLOJURE_SLASH = Symbol.create("clojure.core","/");
//static Pattern accessorPat = Pattern.compile("\\.[a-zA-Z_]\\w*");
//static Pattern instanceMemberPat = Pattern.compile("\\.([a-zA-Z_][\\w\\.]*)\\.([a-zA-Z_]\\w*)");
//static Pattern staticMemberPat = Pattern.compile("([a-zA-Z_][\\w\\.]*)\\.([a-zA-Z_]\\w*)");
//static Pattern classNamePat = Pattern.compile("([a-zA-Z_][\\w\\.]*)\\.");
//symbol->gensymbol
static Var GENSYM_ENV = Var.create(null);
//sorted-map num->gensymbol
static Var ARG_ENV = Var.create(null);
static
{
macros['"'] = new StringReader();
macros[';'] = new CommentReader();
macros['\''] = new WrappingReader(QUOTE);
macros['@'] = new WrappingReader(DEREF);//new DerefReader();
macros['^'] = new DeprecatedWrappingReader(META, "^");
macros['`'] = new SyntaxQuoteReader();
macros['~'] = new UnquoteReader();
macros['('] = new ListReader();
macros[')'] = new UnmatchedDelimiterReader();
macros['['] = new VectorReader();
macros[']'] = new UnmatchedDelimiterReader();
macros['{'] = new MapReader();
macros['}'] = new UnmatchedDelimiterReader();
// macros['|'] = new ArgVectorReader();
macros['\\'] = new CharacterReader();
macros['%'] = new ArgReader();
macros['#'] = new DispatchReader();
dispatchMacros['^'] = new MetaReader();
dispatchMacros['\''] = new VarReader();
dispatchMacros['"'] = new RegexReader();
dispatchMacros['('] = new FnReader();
dispatchMacros['{'] = new SetReader();
dispatchMacros['='] = new EvalReader();
dispatchMacros['!'] = new CommentReader();
dispatchMacros['<'] = new UnreadableReader();
dispatchMacros['_'] = new DiscardReader();
}
static boolean isWhitespace(int ch){
return Character.isWhitespace(ch) || ch == ',';
}
static void unread(PushbackReader r, int ch) throws IOException{
if(ch != -1)
r.unread(ch);
}
public static class ReaderException extends Exception{
final int line;
public ReaderException(int line, Throwable cause){
super(cause);
this.line = line;
}
}
static public Object read(PushbackReader r, boolean eofIsError, Object eofValue, boolean isRecursive)
throws Exception{
try
{
for(; ;)
{
int ch = r.read();
while(isWhitespace(ch))
ch = r.read();
if(ch == -1)
{
if(eofIsError)
throw new Exception("EOF while reading");
return eofValue;
}
if(Character.isDigit(ch))
{
Object n = readNumber(r, (char) ch);
if(RT.suppressRead())
return null;
return n;
}
IFn macroFn = getMacro(ch);
if(macroFn != null)
{
Object ret = macroFn.invoke(r, (char) ch);
if(RT.suppressRead())
return null;
//no op macros return the reader
if(ret == r)
continue;
return ret;
}
if(ch == '+' || ch == '-')
{
int ch2 = r.read();
if(Character.isDigit(ch2))
{
unread(r, ch2);
Object n = readNumber(r, (char) ch);
if(RT.suppressRead())
return null;
return n;
}
unread(r, ch2);
}
String token = readToken(r, (char) ch);
if(RT.suppressRead())
return null;
return interpretToken(token);
}
}
catch(Exception e)
{
if(isRecursive || !(r instanceof LineNumberingPushbackReader))
throw e;
LineNumberingPushbackReader rdr = (LineNumberingPushbackReader) r;
//throw new Exception(String.format("ReaderError:(%d,1) %s", rdr.getLineNumber(), e.getMessage()), e);
throw new ReaderException(rdr.getLineNumber(), e);
}
}
static private String readToken(PushbackReader r, char initch) throws Exception{
StringBuilder sb = new StringBuilder();
sb.append(initch);
for(; ;)
{
int ch = r.read();
if(ch == -1 || isWhitespace(ch) || isTerminatingMacro(ch))
{
unread(r, ch);
return sb.toString();
}
sb.append((char) ch);
}
}
static private Object readNumber(PushbackReader r, char initch) throws Exception{
StringBuilder sb = new StringBuilder();
sb.append(initch);
for(; ;)
{
int ch = r.read();
if(ch == -1 || isWhitespace(ch) || isMacro(ch))
{
unread(r, ch);
break;
}
sb.append((char) ch);
}
String s = sb.toString();
Object n = matchNumber(s);
if(n == null)
throw new NumberFormatException("Invalid number: " + s);
return n;
}
static private int readUnicodeChar(String token, int offset, int length, int base) throws Exception{
if(token.length() != offset + length)
throw new IllegalArgumentException("Invalid unicode character: \\" + token);
int uc = 0;
for(int i = offset; i < offset + length; ++i)
{
int d = Character.digit(token.charAt(i), base);
if(d == -1)
throw new IllegalArgumentException("Invalid digit: " + (char) d);
uc = uc * base + d;
}
return (char) uc;
}
static private int readUnicodeChar(PushbackReader r, int initch, int base, int length, boolean exact) throws Exception{
int uc = Character.digit(initch, base);
if(uc == -1)
throw new IllegalArgumentException("Invalid digit: " + initch);
int i = 1;
for(; i < length; ++i)
{
int ch = r.read();
if(ch == -1 || isWhitespace(ch) || isMacro(ch))
{
unread(r, ch);
break;
}
int d = Character.digit(ch, base);
if(d == -1)
throw new IllegalArgumentException("Invalid digit: " + (char) ch);
uc = uc * base + d;
}
if(i != length && exact)
throw new IllegalArgumentException("Invalid character length: " + i + ", should be: " + length);
return uc;
}
static private Object interpretToken(String s) throws Exception{
if(s.equals("nil"))
{
return null;
}
else if(s.equals("true"))
{
return RT.T;
}
else if(s.equals("false"))
{
return RT.F;
}
else if(s.equals("/"))
{
return SLASH;
}
else if(s.equals("clojure.core//"))
{
return CLOJURE_SLASH;
}
Object ret = null;
ret = matchSymbol(s);
if(ret != null)
return ret;
throw new Exception("Invalid token: " + s);
}
private static Object matchSymbol(String s){
Matcher m = symbolPat.matcher(s);
if(m.matches())
{
int gc = m.groupCount();
String ns = m.group(1);
String name = m.group(2);
if(ns != null && ns.endsWith(":/")
|| name.endsWith(":")
|| s.indexOf("::", 1) != -1)
return null;
if(s.startsWith("::"))
{
Symbol ks = Symbol.intern(s.substring(2));
Namespace kns;
if(ks.ns != null)
kns = Compiler.namespaceFor(ks);
else
kns = Compiler.currentNS();
//auto-resolving keyword
return Keyword.intern(kns.name.name,ks.name);
}
boolean isKeyword = s.charAt(0) == ':';
Symbol sym = Symbol.intern(s.substring(isKeyword ? 1 : 0));
if(isKeyword)
return Keyword.intern(sym);
return sym;
}
return null;
}
private static Object matchNumber(String s){
Matcher m = intPat.matcher(s);
if(m.matches())
{
if(m.group(2) != null)
return 0;
boolean negate = (m.group(1).equals("-"));
String n;
int radix = 10;
if((n = m.group(3)) != null)
radix = 10;
else if((n = m.group(4)) != null)
radix = 16;
else if((n = m.group(5)) != null)
radix = 8;
else if((n = m.group(7)) != null)
radix = Integer.parseInt(m.group(6));
if(n == null)
return null;
BigInteger bn = new BigInteger(n, radix);
return Numbers.reduce(negate ? bn.negate() : bn);
}
m = floatPat.matcher(s);
if(m.matches())
{
if(m.group(4) != null)
return new BigDecimal(m.group(1));
return Double.parseDouble(s);
}
m = ratioPat.matcher(s);
if(m.matches())
{
return Numbers.divide(new BigInteger(m.group(1)), new BigInteger(m.group(2)));
}
return null;
}
static private IFn getMacro(int ch){
if(ch < macros.length)
return macros[ch];
return null;
}
static private boolean isMacro(int ch){
return (ch < macros.length && macros[ch] != null);
}
static private boolean isTerminatingMacro(int ch){
return (ch != '#' && ch < macros.length && macros[ch] != null);
}
public static class RegexReader extends AFn{
static StringReader stringrdr = new StringReader();
public Object invoke(Object reader, Object doublequote) throws Exception{
StringBuilder sb = new StringBuilder();
Reader r = (Reader) reader;
for(int ch = r.read(); ch != '"'; ch = r.read())
{
if(ch == -1)
throw new Exception("EOF while reading regex");
sb.append( (char) ch );
if(ch == '\\') //escape
{
ch = r.read();
if(ch == -1)
throw new Exception("EOF while reading regex");
sb.append( (char) ch ) ;
}
}
return Pattern.compile(sb.toString());
}
}
public static class StringReader extends AFn{
public Object invoke(Object reader, Object doublequote) throws Exception{
StringBuilder sb = new StringBuilder();
Reader r = (Reader) reader;
for(int ch = r.read(); ch != '"'; ch = r.read())
{
if(ch == -1)
throw new Exception("EOF while reading string");
if(ch == '\\') //escape
{
ch = r.read();
if(ch == -1)
throw new Exception("EOF while reading string");
switch(ch)
{
case 't':
ch = '\t';
break;
case 'r':
ch = '\r';
break;
case 'n':
ch = '\n';
break;
case '\\':
break;
case '"':
break;
case 'b':
ch = '\b';
break;
case 'f':
ch = '\f';
break;
case 'u':
{
ch = r.read();
if (Character.digit(ch, 16) == -1)
throw new Exception("Invalid unicode escape: \\u" + (char) ch);
ch = readUnicodeChar((PushbackReader) r, ch, 16, 4, true);
break;
}
default:
{
if(Character.isDigit(ch))
{
ch = readUnicodeChar((PushbackReader) r, ch, 8, 3, false);
if(ch > 0377)
throw new Exception("Octal escape sequence must be in range [0, 377].");
}
else
throw new Exception("Unsupported escape character: \\" + (char) ch);
}
}
}
sb.append((char) ch);
}
return sb.toString();
}
}
public static class CommentReader extends AFn{
public Object invoke(Object reader, Object semicolon) throws Exception{
Reader r = (Reader) reader;
int ch;
do
{
ch = r.read();
} while(ch != -1 && ch != '\n' && ch != '\r');
return r;
}
}
public static class DiscardReader extends AFn{
public Object invoke(Object reader, Object underscore) throws Exception{
PushbackReader r = (PushbackReader) reader;
read(r, true, null, true);
return r;
}
}
public static class WrappingReader extends AFn{
final Symbol sym;
public WrappingReader(Symbol sym){
this.sym = sym;
}
public Object invoke(Object reader, Object quote) throws Exception{
PushbackReader r = (PushbackReader) reader;
Object o = read(r, true, null, true);
return RT.list(sym, o);
}
}
public static class DeprecatedWrappingReader extends AFn{
final Symbol sym;
final String macro;
public DeprecatedWrappingReader(Symbol sym, String macro){
this.sym = sym;
this.macro = macro;
}
public Object invoke(Object reader, Object quote) throws Exception{
System.out.println("WARNING: reader macro " + macro +
" is deprecated; use " + sym.getName() +
" instead");
PushbackReader r = (PushbackReader) reader;
Object o = read(r, true, null, true);
return RT.list(sym, o);
}
}
public static class VarReader extends AFn{
public Object invoke(Object reader, Object quote) throws Exception{
PushbackReader r = (PushbackReader) reader;
Object o = read(r, true, null, true);
// if(o instanceof Symbol)
// {
// Object v = Compiler.maybeResolveIn(Compiler.currentNS(), (Symbol) o);
// if(v instanceof Var)
// return v;
// }
return RT.list(THE_VAR, o);
}
}
/*
static class DerefReader extends AFn{
public Object invoke(Object reader, Object quote) throws Exception{
PushbackReader r = (PushbackReader) reader;
int ch = r.read();
if(ch == -1)
throw new Exception("EOF while reading character");
if(ch == '!')
{
Object o = read(r, true, null, true);
return RT.list(DEREF_BANG, o);
}
else
{
r.unread(ch);
Object o = read(r, true, null, true);
return RT.list(DEREF, o);
}
}
}
*/
public static class DispatchReader extends AFn{
public Object invoke(Object reader, Object hash) throws Exception{
int ch = ((Reader) reader).read();
if(ch == -1)
throw new Exception("EOF while reading character");
IFn fn = dispatchMacros[ch];
if(fn == null)
throw new Exception(String.format("No dispatch macro for: %c", (char) ch));
return fn.invoke(reader, ch);
}
}
static Symbol garg(int n){
return Symbol.intern(null, (n == -1 ? "rest" : ("p" + n)) + "__" + RT.nextID());
}
public static class FnReader extends AFn{
public Object invoke(Object reader, Object lparen) throws Exception{
PushbackReader r = (PushbackReader) reader;
if(ARG_ENV.deref() != null)
throw new IllegalStateException("Nested #()s are not allowed");
try
{
Var.pushThreadBindings(
RT.map(ARG_ENV, PersistentTreeMap.EMPTY));
r.unread('(');
Object form = read(r, true, null, true);
PersistentVector args = PersistentVector.EMPTY;
PersistentTreeMap argsyms = (PersistentTreeMap) ARG_ENV.deref();
ISeq rargs = argsyms.rseq();
if(rargs != null)
{
int higharg = (Integer) ((Map.Entry) rargs.first()).getKey();
if(higharg > 0)
{
for(int i = 1; i <= higharg; ++i)
{
Object sym = argsyms.valAt(i);
if(sym == null)
sym = garg(i);
args = args.cons(sym);
}
}
Object restsym = argsyms.valAt(-1);
if(restsym != null)
{
args = args.cons(Compiler._AMP_);
args = args.cons(restsym);
}
}
return RT.list(Compiler.FN, args, form);
}
finally
{
Var.popThreadBindings();
}
}
}
static Symbol registerArg(int n){
PersistentTreeMap argsyms = (PersistentTreeMap) ARG_ENV.deref();
if(argsyms == null)
{
throw new IllegalStateException("arg literal not in #()");
}
Symbol ret = (Symbol) argsyms.valAt(n);
if(ret == null)
{
ret = garg(n);
ARG_ENV.set(argsyms.assoc(n, ret));
}
return ret;
}
static class ArgReader extends AFn{
public Object invoke(Object reader, Object pct) throws Exception{
PushbackReader r = (PushbackReader) reader;
if(ARG_ENV.deref() == null)
{
return interpretToken(readToken(r, '%'));
}
int ch = r.read();
unread(r, ch);
//% alone is first arg
if(ch == -1 || isWhitespace(ch) || isTerminatingMacro(ch))
{
return registerArg(1);
}
Object n = read(r, true, null, true);
if(n.equals(Compiler._AMP_))
return registerArg(-1);
if(!(n instanceof Number))
throw new IllegalStateException("arg literal must be %, %& or %integer");
return registerArg(((Number) n).intValue());
}
}
public static class MetaReader extends AFn{
public Object invoke(Object reader, Object caret) throws Exception{
PushbackReader r = (PushbackReader) reader;
int line = -1;
if(r instanceof LineNumberingPushbackReader)
line = ((LineNumberingPushbackReader) r).getLineNumber();
Object meta = read(r, true, null, true);
if(meta instanceof Symbol || meta instanceof Keyword || meta instanceof String)
meta = RT.map(RT.TAG_KEY, meta);
else if(!(meta instanceof IPersistentMap))
throw new IllegalArgumentException("Metadata must be Symbol,Keyword,String or Map");
Object o = read(r, true, null, true);
if(o instanceof IMeta)
{
if(line != -1 && o instanceof ISeq)
meta = ((IPersistentMap) meta).assoc(RT.LINE_KEY, line);
if(o instanceof IReference)
{
((IReference)o).resetMeta((IPersistentMap) meta);
return o;
}
return ((IObj) o).withMeta((IPersistentMap) meta);
}
else
throw new IllegalArgumentException("Metadata can only be applied to IMetas");
}
}
public static class SyntaxQuoteReader extends AFn{
public Object invoke(Object reader, Object backquote) throws Exception{
PushbackReader r = (PushbackReader) reader;
try
{
Var.pushThreadBindings(
RT.map(GENSYM_ENV, PersistentHashMap.EMPTY));
Object form = read(r, true, null, true);
return syntaxQuote(form);
}
finally
{
Var.popThreadBindings();
}
}
static Object syntaxQuote(Object form) throws Exception{
Object ret;
if(Compiler.isSpecial(form))
ret = RT.list(Compiler.QUOTE, form);
else if(form instanceof Symbol)
{
Symbol sym = (Symbol) form;
if(sym.ns == null && sym.name.endsWith("#"))
{
IPersistentMap gmap = (IPersistentMap) GENSYM_ENV.deref();
if(gmap == null)
throw new IllegalStateException("Gensym literal not in syntax-quote");
Symbol gs = (Symbol) gmap.valAt(sym);
if(gs == null)
GENSYM_ENV.set(gmap.assoc(sym, gs = Symbol.intern(null,
sym.name.substring(0, sym.name.length() - 1)
+ "__" + RT.nextID() + "__auto__")));
sym = gs;
}
else if(sym.ns == null && sym.name.endsWith("."))
{
Symbol csym = Symbol.intern(null, sym.name.substring(0, sym.name.length() - 1));
csym = Compiler.resolveSymbol(csym);
sym = Symbol.intern(null, csym.name.concat("."));
}
else if(sym.ns == null && sym.name.startsWith("."))
{
// Simply quote method names.
}
else
{
Object maybeClass = null;
if(sym.ns != null)
maybeClass = Compiler.currentNS().getMapping(
Symbol.intern(null, sym.ns));
if(maybeClass instanceof Class)
{
// Classname/foo -> package.qualified.Classname/foo
sym = Symbol.intern(
((Class)maybeClass).getName(), sym.name);
}
else
sym = Compiler.resolveSymbol(sym);
}
ret = RT.list(Compiler.QUOTE, sym);
}
else if(isUnquote(form))
return RT.second(form);
else if(isUnquoteSplicing(form))
throw new IllegalStateException("splice not in list");
else if(form instanceof IPersistentCollection)
{
if(form instanceof IPersistentMap)
{
IPersistentVector keyvals = flattenMap(form);
ret = RT.list(APPLY, HASHMAP, RT.list(SEQ, RT.cons(CONCAT, sqExpandList(keyvals.seq()))));
}
else if(form instanceof IPersistentVector)
{
ret = RT.list(APPLY, VECTOR, RT.list(SEQ, RT.cons(CONCAT, sqExpandList(((IPersistentVector) form).seq()))));
}
else if(form instanceof IPersistentSet)
{
ret = RT.list(APPLY, HASHSET, RT.list(SEQ, RT.cons(CONCAT, sqExpandList(((IPersistentSet) form).seq()))));
}
else if(form instanceof ISeq || form instanceof IPersistentList)
{
ISeq seq = RT.seq(form);
if(seq == null)
ret = RT.cons(LIST,null);
else
ret = RT.list(SEQ, RT.cons(CONCAT, sqExpandList(seq)));
}
else
throw new UnsupportedOperationException("Unknown Collection type");
}
else if(form instanceof Keyword
|| form instanceof Number
|| form instanceof Character
|| form instanceof String)
ret = form;
else
ret = RT.list(Compiler.QUOTE, form);
if(form instanceof IObj && RT.meta(form) != null)
{
//filter line numbers
IPersistentMap newMeta = ((IObj) form).meta().without(RT.LINE_KEY);
if(newMeta.count() > 0)
return RT.list(WITH_META, ret, syntaxQuote(((IObj) form).meta()));
}
return ret;
}
private static ISeq sqExpandList(ISeq seq) throws Exception{
PersistentVector ret = PersistentVector.EMPTY;
for(; seq != null; seq = seq.next())
{
Object item = seq.first();
if(isUnquote(item))
ret = ret.cons(RT.list(LIST, RT.second(item)));
else if(isUnquoteSplicing(item))
ret = ret.cons(RT.second(item));
else
ret = ret.cons(RT.list(LIST, syntaxQuote(item)));
}
return ret.seq();
}
private static IPersistentVector flattenMap(Object form){
IPersistentVector keyvals = PersistentVector.EMPTY;
for(ISeq s = RT.seq(form); s != null; s = s.next())
{
IMapEntry e = (IMapEntry) s.first();
keyvals = (IPersistentVector) keyvals.cons(e.key());
keyvals = (IPersistentVector) keyvals.cons(e.val());
}
return keyvals;
}
}
static boolean isUnquoteSplicing(Object form){
return form instanceof ISeq && Util.equals(RT.first(form),UNQUOTE_SPLICING);
}
static boolean isUnquote(Object form){
return form instanceof ISeq && Util.equals(RT.first(form),UNQUOTE);
}
static class UnquoteReader extends AFn{
public Object invoke(Object reader, Object comma) throws Exception{
PushbackReader r = (PushbackReader) reader;
int ch = r.read();
if(ch == -1)
throw new Exception("EOF while reading character");
if(ch == '@')
{
Object o = read(r, true, null, true);
return RT.list(UNQUOTE_SPLICING, o);
}
else
{
unread(r, ch);
Object o = read(r, true, null, true);
return RT.list(UNQUOTE, o);
}
}
}
public static class CharacterReader extends AFn{
public Object invoke(Object reader, Object backslash) throws Exception{
PushbackReader r = (PushbackReader) reader;
int ch = r.read();
if(ch == -1)
throw new Exception("EOF while reading character");
String token = readToken(r, (char) ch);
if(token.length() == 1)
return Character.valueOf(token.charAt(0));
else if(token.equals("newline"))
return '\n';
else if(token.equals("space"))
return ' ';
else if(token.equals("tab"))
return '\t';
else if(token.equals("backspace"))
return '\b';
else if(token.equals("formfeed"))
return '\f';
else if(token.equals("return"))
return '\r';
else if(token.startsWith("u"))
{
char c = (char) readUnicodeChar(token, 1, 4, 16);
if(c >= '\uD800' && c <= '\uDFFF') // surrogate code unit?
throw new Exception("Invalid character constant: \\u" + Integer.toString(c, 16));
return c;
}
else if(token.startsWith("o"))
{
int len = token.length() - 1;
if(len > 3)
throw new Exception("Invalid octal escape sequence length: " + len);
int uc = readUnicodeChar(token, 1, len, 8);
if(uc > 0377)
throw new Exception("Octal escape sequence must be in range [0, 377].");
return (char) uc;
}
throw new Exception("Unsupported character: \\" + token);
}
}
public static class ListReader extends AFn{
public Object invoke(Object reader, Object leftparen) throws Exception{
PushbackReader r = (PushbackReader) reader;
int line = -1;
if(r instanceof LineNumberingPushbackReader)
line = ((LineNumberingPushbackReader) r).getLineNumber();
List list = readDelimitedList(')', r, true);
if(list.isEmpty())
return PersistentList.EMPTY;
IObj s = (IObj) PersistentList.create(list);
// IObj s = (IObj) RT.seq(list);
if(line != -1)
return s.withMeta(RT.map(RT.LINE_KEY, line));
else
return s;
}
}
static class CtorReader extends AFn{
static final Symbol cls = Symbol.create("class");
public Object invoke(Object reader, Object leftangle) throws Exception{
PushbackReader r = (PushbackReader) reader;
// #<class classname>
// #<classname args*>
// #<classname/staticMethod args*>
List list = readDelimitedList('>', r, true);
if(list.isEmpty())
throw new Exception("Must supply 'class', classname or classname/staticMethod");
Symbol s = (Symbol) list.get(0);
Object[] args = list.subList(1, list.size()).toArray();
if(s.equals(cls))
{
return RT.classForName(args[0].toString());
}
else if(s.ns != null) //static method
{
String classname = s.ns;
String method = s.name;
return Reflector.invokeStaticMethod(classname, method, args);
}
else
{
return Reflector.invokeConstructor(RT.classForName(s.name), args);
}
}
}
public static class EvalReader extends AFn{
public Object invoke(Object reader, Object eq) throws Exception{
if (!RT.booleanCast(RT.READEVAL.deref()))
{
throw new Exception("EvalReader not allowed when *read-eval* is false.");
}
PushbackReader r = (PushbackReader) reader;
Object o = read(r, true, null, true);
if(o instanceof Symbol)
{
return RT.classForName(o.toString());
}
else if(o instanceof IPersistentList)
{
Symbol fs = (Symbol) RT.first(o);
if(fs.equals(THE_VAR))
{
Symbol vs = (Symbol) RT.second(o);
return RT.var(vs.ns, vs.name); //Compiler.resolve((Symbol) RT.second(o),true);
}
if(fs.name.endsWith("."))
{
Object[] args = RT.toArray(RT.next(o));
return Reflector.invokeConstructor(RT.classForName(fs.name.substring(0, fs.name.length() - 1)), args);
}
if(Compiler.namesStaticMember(fs))
{
Object[] args = RT.toArray(RT.next(o));
return Reflector.invokeStaticMethod(fs.ns, fs.name, args);
}
Object v = Compiler.maybeResolveIn(Compiler.currentNS(), fs);
if(v instanceof Var)
{
return ((IFn) v).applyTo(RT.next(o));
}
throw new Exception("Can't resolve " + fs);
}
else
throw new IllegalArgumentException("Unsupported #= form");
}
}
//static class ArgVectorReader extends AFn{
// public Object invoke(Object reader, Object leftparen) throws Exception{
// PushbackReader r = (PushbackReader) reader;
// return ArgVector.create(readDelimitedList('|', r, true));
// }
//
//}
public static class VectorReader extends AFn{
public Object invoke(Object reader, Object leftparen) throws Exception{
PushbackReader r = (PushbackReader) reader;
return LazilyPersistentVector.create(readDelimitedList(']', r, true));
}
}
public static class MapReader extends AFn{
public Object invoke(Object reader, Object leftparen) throws Exception{
PushbackReader r = (PushbackReader) reader;
return RT.map(readDelimitedList('}', r, true).toArray());
}
}
public static class SetReader extends AFn{
public Object invoke(Object reader, Object leftbracket) throws Exception{
PushbackReader r = (PushbackReader) reader;
return PersistentHashSet.create(readDelimitedList('}', r, true));
}
}
public static class UnmatchedDelimiterReader extends AFn{
public Object invoke(Object reader, Object rightdelim) throws Exception{
throw new Exception("Unmatched delimiter: " + rightdelim);
}
}
public static class UnreadableReader extends AFn{
public Object invoke(Object reader, Object leftangle) throws Exception{
throw new Exception("Unreadable form");
}
}
public static List readDelimitedList(char delim, PushbackReader r, boolean isRecursive) throws Exception{
ArrayList a = new ArrayList();
for(; ;)
{
int ch = r.read();
while(isWhitespace(ch))
ch = r.read();
if(ch == -1)
throw new Exception("EOF while reading");
if(ch == delim)
break;
IFn macroFn = getMacro(ch);
if(macroFn != null)
{
Object mret = macroFn.invoke(r, (char) ch);
//no op macros return the reader
if(mret != r)
a.add(mret);
}
else
{
unread(r, ch);
Object o = read(r, true, null, isRecursive);
if(o != r)
a.add(o);
}
}
return a;
}
/*
public static void main(String[] args) throws Exception{
//RT.init();
PushbackReader rdr = new PushbackReader( new java.io.StringReader( "(+ 21 21)" ) );
Object input = LispReader.read(rdr, false, new Object(), false );
System.out.println(Compiler.eval(input));
}
public static void main(String[] args){
LineNumberingPushbackReader r = new LineNumberingPushbackReader(new InputStreamReader(System.in));
OutputStreamWriter w = new OutputStreamWriter(System.out);
Object ret = null;
try
{
for(; ;)
{
ret = LispReader.read(r, true, null, false);
RT.print(ret, w);
w.write('\n');
if(ret != null)
w.write(ret.getClass().toString());
w.write('\n');
w.flush();
}
}
catch(Exception e)
{
e.printStackTrace();
}
}
*/
}