/*
* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.jshell;
import java.util.Arrays;
import static java.util.stream.Collectors.joining;
import static jdk.jshell.Util.DOIT_METHOD_NAME;
/**
* Wrapping of source into Java methods, fields, etc. All but outer layer
* wrapping with imports and class.
*
* @author Robert Field
*/
abstract class Wrap implements GeneralWrap {
private static Wrap methodWrap(String prefix, String source, String suffix) {
Wrap wunit = new NoWrap(source);
return new DoitMethodWrap(new CompoundWrap(prefix, wunit, suffix));
}
public static Wrap methodWrap(String source) {
return methodWrap("", source, semi(source) + " return null;\n");
}
public static Wrap methodReturnWrap(String source) {
return methodWrap("return ", source, semi(source));
}
public static Wrap methodUnreachableSemiWrap(String source) {
return methodWrap("", source, semi(source));
}
public static Wrap methodUnreachableWrap(String source) {
return methodWrap("", source, "");
}
private static String indent(int n) {
return " ".substring(0, n * 4);
}
private static String nlindent(int n) {
return "\n" + indent(n);
}
/**
*
* @param in
* @param rname
* @param rinit Initializer or null
* @param rdecl Type name and name
* @return
*/
public static Wrap varWrap(String source, Range rtype, String brackets, Range rname, Range rinit) {
RangeWrap wname = new RangeWrap(source, rname);
RangeWrap wtype = new RangeWrap(source, rtype);
Wrap wVarDecl = new VarDeclareWrap(wtype, brackets, wname);
Wrap wmeth;
if (rinit == null) {
wmeth = new CompoundWrap(new NoWrap(" "), " return null;\n");
} else {
RangeWrap winit = new RangeWrap(source, rinit);
// int x = y
// int x_ = y; return x = x_;
// decl + "_ = " + init ; + "return " + name + "=" + name + "_ ;"
wmeth = new CompoundWrap(
wtype, brackets + " ", wname, "_ =\n ", winit, semi(winit),
" return ", wname, " = ", wname, "_;\n"
);
}
Wrap wInitMeth = new DoitMethodWrap(wmeth);
return new CompoundWrap(wVarDecl, wInitMeth);
}
public static Wrap tempVarWrap(String source, String typename, String name) {
RangeWrap winit = new NoWrap(source);
// y
// return $1 = y;
// "return " + $1 + "=" + init ;
Wrap wmeth = new CompoundWrap("return " + name + " =\n ", winit, semi(winit));
Wrap wInitMeth = new DoitMethodWrap(wmeth);
String varDecl = " public static\n " + typename + " " + name + ";\n";
return new CompoundWrap(varDecl, wInitMeth);
}
public static Wrap simpleWrap(String source) {
return new NoWrap(source);
}
public static Wrap classMemberWrap(String source) {
Wrap w = new NoWrap(source);
return new CompoundWrap(" public static\n ", w);
}
private static int countLines(String s) {
return countLines(s, 0, s.length());
}
private static int countLines(String s, int from, int toEx) {
int cnt = 0;
int idx = from;
while ((idx = s.indexOf('\n', idx)) > 0) {
if (idx >= toEx) break;
++cnt;
++idx;
}
return cnt;
}
public static final class Range {
final int begin;
final int end;
Range(int begin, int end) {
this.begin = begin;
this.end = end;
}
Range(String s) {
this.begin = 0;
this.end = s.length();
}
String part(String s) {
return s.substring(begin, end);
}
int length() {
return end - begin;
}
boolean isEmpty() {
return end == begin;
}
void verify(String s) {
if (begin < 0 || end <= begin || end > s.length()) {
throw new InternalError("Bad Range: " + s + "[" + begin + "," + end + "]");
}
}
@Override
public String toString() {
return "Range[" + begin + "," + end + "]";
}
}
public static class CompoundWrap extends Wrap {
final Object[] os;
final String wrapped;
final int snidxFirst;
final int snidxLast;
final int snlineFirst;
final int snlineLast;
CompoundWrap(Object... os) {
this.os = os;
int sniFirst = Integer.MAX_VALUE;
int sniLast = Integer.MIN_VALUE;
int snlnFirst = Integer.MAX_VALUE;
int snlnLast = Integer.MIN_VALUE;
StringBuilder sb = new StringBuilder();
for (Object o : os) {
if (o instanceof String) {
String s = (String) o;
sb.append(s);
} else if (o instanceof Wrap) {
Wrap w = (Wrap) o;
if (w.firstSnippetIndex() < sniFirst) {
sniFirst = w.firstSnippetIndex();
}
if (w.lastSnippetIndex() > sniLast) {
sniLast = w.lastSnippetIndex();
}
if (w.firstSnippetLine() < snlnFirst) {
snlnFirst = w.firstSnippetLine();
}
if (w.lastSnippetLine() > snlnLast) {
snlnLast = w.lastSnippetLine();
}
sb.append(w.wrapped());
} else {
throw new InternalError("Bad object in CommoundWrap: " + o);
}
}
this.wrapped = sb.toString();
this.snidxFirst = sniFirst;
this.snidxLast = sniLast;
this.snlineFirst = snlnFirst;
this.snlineLast = snlnLast;
}
@Override
public String wrapped() {
return wrapped;
}
@Override
public int snippetIndexToWrapIndex(int sni) {
int before = 0;
for (Object o : os) {
if (o instanceof String) {
String s = (String) o;
before += s.length();
} else if (o instanceof Wrap) {
Wrap w = (Wrap) o;
if (sni >= w.firstSnippetIndex() && sni <= w.lastSnippetIndex()) {
return w.snippetIndexToWrapIndex(sni) + before;
}
before += w.wrapped().length();
}
}
return 0;
}
Wrap wrapIndexToWrap(long wi) {
int before = 0;
Wrap w = null;
for (Object o : os) {
if (o instanceof String) {
String s = (String) o;
before += s.length();
} else if (o instanceof Wrap) {
w = (Wrap) o;
int len = w.wrapped().length();
if ((wi - before) <= len) {
//System.err.printf("Defer to wrap %s - wi: %d. before; %d -- %s >>> %s\n",
// w, wi, before, w.debugPos(wi - before), w.wrapped());
return w;
}
before += len;
}
}
return w;
}
@Override
public int wrapIndexToSnippetIndex(int wi) {
int before = 0;
for (Object o : os) {
if (o instanceof String) {
String s = (String) o;
before += s.length();
} else if (o instanceof Wrap) {
Wrap w = (Wrap) o;
int len = w.wrapped().length();
if ((wi - before) <= len) {
//System.err.printf("Defer to wrap %s - wi: %d. before; %d -- %s >>> %s\n",
// w, wi, before, w.debugPos(wi - before), w.wrapped());
return w.wrapIndexToSnippetIndex(wi - before);
}
before += len;
}
}
return lastSnippetIndex();
}
@Override
public int firstSnippetIndex() {
return snidxFirst;
}
@Override
public int lastSnippetIndex() {
return snidxLast;
}
@Override
public int snippetLineToWrapLine(int snline) {
int before = 0;
for (Object o : os) {
if (o instanceof String) {
String s = (String) o;
before += countLines(s);
} else if (o instanceof Wrap) {
Wrap w = (Wrap) o;
if (snline >= w.firstSnippetLine() && snline <= w.lastSnippetLine()) {
return w.snippetLineToWrapLine(snline) + before;
}
before += countLines(w.wrapped());
}
}
return 0;
}
Wrap wrapLineToWrap(int wline) {
int before = 0;
Wrap w = null;
for (Object o : os) {
if (o instanceof String) {
String s = (String) o;
before += countLines(s);
} else if (o instanceof Wrap) {
w = (Wrap) o;
int lns = countLines(w.wrapped());
if ((wline - before) < lns) {
return w;
}
before += lns;
}
}
return w;
}
@Override
public int wrapLineToSnippetLine(int wline) {
int before = 0;
for (Object o : os) {
if (o instanceof String) {
String s = (String) o;
before += countLines(s);
} else if (o instanceof Wrap) {
Wrap w = (Wrap) o;
int lns = countLines(w.wrapped());
if ((wline - before) < lns) {
return w.wrapLineToSnippetLine(wline - before);
}
before += lns;
}
}
return 0;
}
@Override
public int firstSnippetLine() {
return snlineFirst;
}
@Override
public int lastSnippetLine() {
return snlineLast;
}
@Override
public String toString() {
return "CompoundWrap(" + Arrays.stream(os).map(u -> u.toString()).collect(joining(",")) + ")";
}
}
private static class RangeWrap extends Wrap {
final Range range;
final String wrapped;
final int firstSnline;
final int lastSnline;
RangeWrap(String snippetSource, Range usedWithinSnippet) {
this.range = usedWithinSnippet;
this.wrapped = usedWithinSnippet.part(snippetSource);
usedWithinSnippet.verify(snippetSource);
this.firstSnline = countLines(snippetSource, 0, range.begin);
this.lastSnline = firstSnline + countLines(snippetSource, range.begin, range.end);
}
@Override
public String wrapped() {
return wrapped;
}
@Override
public int snippetIndexToWrapIndex(int sni) {
if (sni < range.begin) {
return 0;
}
if (sni > range.end) {
return range.length();
}
return sni - range.begin;
}
@Override
public int wrapIndexToSnippetIndex(int wi) {
if (wi < 0) {
return 0; // bad index
}
int max = range.length();
if (wi > max) {
wi = max;
}
return wi + range.begin;
}
@Override
public int firstSnippetIndex() {
return range.begin;
}
@Override
public int lastSnippetIndex() {
return range.end;
}
@Override
public int snippetLineToWrapLine(int snline) {
if (snline < firstSnline) {
return 0;
}
if (snline >= lastSnline) {
return lastSnline - firstSnline;
}
return snline - firstSnline;
}
@Override
public int wrapLineToSnippetLine(int wline) {
if (wline < 0) {
return 0; // bad index
}
int max = lastSnline - firstSnline;
if (wline > max) {
wline = max;
}
return wline + firstSnline;
}
@Override
public int firstSnippetLine() {
return firstSnline;
}
@Override
public int lastSnippetLine() {
return lastSnline;
}
@Override
public String toString() {
return "RangeWrap(" + range + ")";
}
}
private static class NoWrap extends RangeWrap {
NoWrap(String unit) {
super(unit, new Range(unit));
}
}
private static String semi(Wrap w) {
return semi(w.wrapped());
}
private static String semi(String s) {
return ((s.endsWith(";")) ? "\n" : ((s.endsWith(";\n")) ? "" : ";\n"));
}
private static class DoitMethodWrap extends CompoundWrap {
DoitMethodWrap(Wrap w) {
super(" public static Object " + DOIT_METHOD_NAME + "() throws Throwable {\n"
+ " ", w,
" }\n");
}
}
private static class VarDeclareWrap extends CompoundWrap {
VarDeclareWrap(Wrap wtype, String brackets, Wrap wname) {
super(" public static ", wtype, brackets + " ", wname, semi(wname));
}
}
}