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StringScanner.java
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StringScanner.java
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package com.rho;
import org.apache.oro.text.regex.*;
import com.xruby.runtime.lang.*;
import com.xruby.runtime.builtin.*;
//@RubyLevelClass(name="StringScanner")
public class StringScanner extends RubyBasic {
RubyString str;
PatternMatcherInput input;
Perl5Matcher matcher;
MatchResult result;
int scannerFlags = 0;
private static final int MATCHED_STR_SCN_F = 1 << 11;
StringScanner(RubyClass c) {
super(c);
}
//@RubyAllocMethod
public static StringScanner alloc(RubyValue receiver) {
return new StringScanner((RubyClass)receiver);//RubyRuntime.StringScannerClass);
}
//@RubyLevelMethod(name="initialize")
public StringScanner initialize(RubyValue v) {
str = v.toRubyString();
input = new PatternMatcherInput(str.toString());
matcher = new Perl5Matcher();
return this;
}
private void check() {
if (str == null)
throw new RubyException("uninitialized StringScanner object");
}
//@RubyLevelMethod(name="eos?")
public RubyValue isEos() {
check();
return input.endOfInput() ? RubyConstant.QTRUE : RubyConstant.QFALSE;
}
//@RubyLevelMethod(name="scan")
public RubyValue scan(RubyValue regex) {
return scan(regex, true, true, true);
}
public RubyValue skip(RubyValue regex) {
return scan(regex, true, false, true);
}
//@RubyLevelMethod(name = "check")
public RubyValue check(RubyValue regex) {
return scan(regex, false, true, true);
}
//@RubyLevelMethod(name = "match?")
public RubyValue ismatch(RubyValue regex) {
return scan(regex, false, false, true);
}
//@RubyLevelMethod(name = "string")
public RubyString string() {
return str;
}
//@RubyLevelMethod(name = "peek")
public RubyString peek(RubyValue val)
{
int nLen = val.toInt();
int nOffset = input.getCurrentOffset();
if ( nOffset >= str.length() )
return ObjectFactory.createString("");
if (nOffset+nLen > str.length() )
nLen = str.length()-nOffset;
String strRes = str.toStr().substring(nOffset, nOffset+nLen);
return ObjectFactory.createString(strRes);
}
//@RubyLevelMethod(name = "string=")
public RubyValue set_string(RubyValue str) {
initialize(str);
clearMatched();
return str;
}
public RubyValue reset() {
//input = new PatternMatcherInput(str.toString());
//matcher = new Perl5Matcher();
//clearMatched();
return this;
}
//@RubyLevelMethod(name="[]")
public RubyValue getResult(RubyValue arg) {
int nIndex = arg.toInt();
if ( result == null )
return RubyConstant.QNIL;
if ( nIndex < 0 || nIndex >= result.groups() )
throw new RubyException("Invalid argument");
String s = result.group(nIndex);
if ( null == s )
return RubyConstant.QNIL;
return ObjectFactory.createString( s );
}
private RubyValue scan(RubyValue regex, boolean succptr, boolean getstr, boolean headonly) {
if (!(regex instanceof RubyRegexp))
throw new RubyException("wrong argument type " + regex.getRubyClass().toString() + " (expected Regexp)");
check();
clearMatched();
RubyRegexp re = ((RubyRegexp)regex);
boolean bRes = false;
int nOffset = input.getCurrentOffset();
bRes = matcher.matchesPrefixEx(input, re.getPattern() );//matcher.contains(input, re.getPattern() );
if ( !bRes )
return RubyConstant.QNIL;
if ( !succptr )
input.setCurrentOffset(nOffset);
result = matcher.getMatch();
setMatched();
if ( getstr )
return getResult(ObjectFactory.createInteger(0));
else
{
String s = result != null ? result.group(0) : "";
return ObjectFactory.createInteger(s != null ? s.length() : 0);
}
}
private void clearMatched() {
scannerFlags &= ~MATCHED_STR_SCN_F;
}
private void setMatched() {
scannerFlags |= MATCHED_STR_SCN_F;
}
public static void initMethods( RubyClass klass){
klass.defineMethod( "initialize", new RubyOneOrTwoArgMethod(){
protected RubyValue run(RubyValue receiver, RubyValue arg, RubyBlock block ){
return ((StringScanner)receiver).initialize(arg);}
protected RubyValue run(RubyValue receiver, RubyValue arg, RubyValue arg1, RubyBlock block ){
return ((StringScanner)receiver).initialize(arg);}
});
klass.defineAllocMethod(new RubyNoArgMethod(){
protected RubyValue run(RubyValue receiver, RubyBlock block ) {
return StringScanner.alloc(receiver);}
});
klass.defineMethod( "eos?", new RubyNoArgMethod(){
protected RubyValue run(RubyValue receiver, RubyBlock block ){
return ((StringScanner)receiver).isEos();}
});
klass.defineMethod( "scan", new RubyOneArgMethod(){
protected RubyValue run(RubyValue receiver, RubyValue arg, RubyBlock block ){
return ((StringScanner)receiver).scan(arg);}
});
klass.defineMethod( "skip", new RubyOneArgMethod(){
protected RubyValue run(RubyValue receiver, RubyValue arg, RubyBlock block ){
return ((StringScanner)receiver).skip(arg);}
});
klass.defineMethod( "[]", new RubyOneArgMethod(){
protected RubyValue run(RubyValue receiver, RubyValue arg, RubyBlock block ){
return ((StringScanner)receiver).getResult(arg);}
});
klass.defineMethod( "string", new RubyNoArgMethod(){
protected RubyValue run(RubyValue receiver, RubyBlock block ){
return ((StringScanner)receiver).string();}
});
klass.defineMethod( "string=", new RubyOneArgMethod(){
protected RubyValue run(RubyValue receiver, RubyValue arg, RubyBlock block ){
return ((StringScanner)receiver).set_string(arg);}
});
klass.defineMethod( "check", new RubyOneArgMethod(){
protected RubyValue run(RubyValue receiver, RubyValue arg, RubyBlock block ){
return ((StringScanner)receiver).check(arg);}
});
klass.defineMethod( "reset", new RubyNoArgMethod(){
protected RubyValue run(RubyValue receiver, RubyBlock block ){
return ((StringScanner)receiver).reset();}
});
klass.defineMethod( "peek", new RubyOneArgMethod(){
protected RubyValue run(RubyValue receiver, RubyValue arg, RubyBlock block ){
return ((StringScanner)receiver).peek(arg);}
});
klass.defineMethod( "match?", new RubyOneArgMethod(){
protected RubyValue run(RubyValue receiver, RubyValue arg, RubyBlock block ){
return ((StringScanner)receiver).ismatch(arg);}
});
}
}