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The ANTLR 4 grammar compiler.
/*
* [The "BSD license"]
* Copyright (c) 2012 Terence Parr
* Copyright (c) 2012 Sam Harwell
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.antlr.v4.parse;
import org.antlr.runtime.BaseRecognizer;
import org.antlr.runtime.CommonToken;
import org.antlr.v4.runtime.misc.Pair;
import org.antlr.v4.tool.Attribute;
import org.antlr.v4.tool.AttributeDict;
import org.antlr.v4.tool.ErrorType;
import org.antlr.v4.tool.Grammar;
import org.antlr.v4.tool.ast.ActionAST;
import java.util.ArrayList;
import java.util.List;
/** Parse args, return values, locals
*
* rule[arg1, arg2, ..., argN] returns [ret1, ..., retN]
*
* text is target language dependent. Java/C#/C/C++ would
* use "int i" but ruby/python would use "i".
*/
public class ScopeParser {
/** Given an arg or retval scope definition list like
*
*
* Map<String, String>, int[] j3, char *foo32[3]
*
*
* or
*
*
* int i=3, j=a[34]+20
*
*
* convert to an attribute scope.
*/
public static AttributeDict parseTypedArgList(ActionAST action, String s, Grammar g) {
return parse(action, s, ',', g);
}
public static AttributeDict parse(ActionAST action, String s, char separator, Grammar g) {
AttributeDict dict = new AttributeDict();
List> decls = splitDecls(s, separator);
for (Pair decl : decls) {
// System.out.println("decl="+decl);
if ( decl.a.trim().length()>0 ) {
Attribute a = parseAttributeDef(action, decl, g);
dict.add(a);
}
}
return dict;
}
/** For decls like "String foo" or "char *foo32[]" compute the ID
* and type declarations. Also handle "int x=3" and 'T t = new T("foo")'
* but if the separator is ',' you cannot use ',' in the initvalue
* unless you escape use "\," escape.
*/
public static Attribute parseAttributeDef(ActionAST action, Pair decl, Grammar g) {
if ( decl.a==null ) return null;
Attribute attr = new Attribute();
boolean inID = false;
int start = -1;
int rightEdgeOfDeclarator = decl.a.length()-1;
int equalsIndex = decl.a.indexOf('=');
if ( equalsIndex>0 ) {
// everything after the '=' is the init value
attr.initValue = decl.a.substring(equalsIndex+1,decl.a.length());
rightEdgeOfDeclarator = equalsIndex-1;
}
// walk backwards looking for start of an ID
for (int i=rightEdgeOfDeclarator; i>=0; i--) {
// if we haven't found the end yet, keep going
if ( !inID && Character.isLetterOrDigit(decl.a.charAt(i)) ) {
inID = true;
}
else if ( inID &&
!(Character.isLetterOrDigit(decl.a.charAt(i))||
decl.a.charAt(i)=='_') ) {
start = i+1;
break;
}
}
if ( start<0 && inID ) {
start = 0;
}
if ( start<0 ) {
g.tool.errMgr.grammarError(ErrorType.CANNOT_FIND_ATTRIBUTE_NAME_IN_DECL, g.fileName, action.token, decl);
}
// walk forwards looking for end of an ID
int stop=-1;
for (int i=start; i<=rightEdgeOfDeclarator; i++) {
// if we haven't found the end yet, keep going
if ( !(Character.isLetterOrDigit(decl.a.charAt(i))||
decl.a.charAt(i)=='_') )
{
stop = i;
break;
}
if ( i==rightEdgeOfDeclarator ) {
stop = i+1;
}
}
// the name is the last ID
attr.name = decl.a.substring(start,stop);
// the type is the decl minus the ID (could be empty)
attr.type = decl.a.substring(0,start);
if ( stop<=rightEdgeOfDeclarator ) {
attr.type += decl.a.substring(stop,rightEdgeOfDeclarator+1);
}
attr.type = attr.type.trim();
if ( attr.type.length()==0 ) {
attr.type = null;
}
attr.decl = decl.a;
if (action != null) {
String actionText = action.getText();
int[] lines = new int[actionText.length()];
int[] charPositionInLines = new int[actionText.length()];
for (int i = 0, line = 0, col = 0; i < actionText.length(); i++, col++) {
lines[i] = line;
charPositionInLines[i] = col;
if (actionText.charAt(i) == '\n') {
line++;
col = -1;
}
}
int[] charIndexes = new int[actionText.length()];
for (int i = 0, j = 0; i < actionText.length(); i++, j++) {
charIndexes[j] = i;
if (i < actionText.length() - 1 && actionText.charAt(i) == '/' && actionText.charAt(i + 1) == '/') {
while (i < actionText.length() && actionText.charAt(i) != '\n') {
i++;
}
}
}
int declOffset = charIndexes[decl.b];
int declLine = lines[declOffset + start];
int line = action.getToken().getLine() + declLine;
int charPositionInLine = charPositionInLines[declOffset + start];
if (declLine == 0) {
/* offset for the start position of the ARG_ACTION token, plus 1
* since the ARG_ACTION text had the leading '[' stripped before
* reaching the scope parser.
*/
charPositionInLine += action.getToken().getCharPositionInLine() + 1;
}
int offset = ((CommonToken)action.getToken()).getStartIndex();
attr.token = new CommonToken(action.getToken().getInputStream(), ANTLRParser.ID, BaseRecognizer.DEFAULT_TOKEN_CHANNEL, offset + declOffset + start + 1, offset + declOffset + stop);
attr.token.setLine(line);
attr.token.setCharPositionInLine(charPositionInLine);
assert attr.name.equals(attr.token.getText()) : "Attribute text should match the pseudo-token text at this point.";
}
return attr;
}
/** Given an argument list like
*
* x, (*a).foo(21,33), 3.2+1, '\n',
* "a,oo\nick", {bl, "fdkj"eck}, ["cat\n,", x, 43]
*
* convert to a list of attributes. Allow nested square brackets etc...
* Set separatorChar to ';' or ',' or whatever you want.
*/
public static List> splitDecls(String s, int separatorChar) {
List> args = new ArrayList>();
_splitArgumentList(s, 0, -1, separatorChar, args);
return args;
}
public static int _splitArgumentList(String actionText,
int start,
int targetChar,
int separatorChar,
List> args)
{
if ( actionText==null ) {
return -1;
}
actionText = actionText.replaceAll("//[^\\n]*", "");
int n = actionText.length();
//System.out.println("actionText@"+start+"->"+(char)targetChar+"="+actionText.substring(start,n));
int p = start;
int last = p;
while ( p',p+1)>=p ) {
// do we see a matching '>' ahead? if so, hope it's a generic
// and not less followed by expr with greater than
p = _splitArgumentList(actionText,p+1,'>',separatorChar,args);
}
else {
p++; // treat as normal char
}
break;
case '[' :
p = _splitArgumentList(actionText,p+1,']',separatorChar,args);
break;
default :
if ( c==separatorChar && targetChar==-1 ) {
String arg = actionText.substring(last, p);
int index = last;
while (index < p && Character.isWhitespace(actionText.charAt(index))) {
index++;
}
//System.out.println("arg="+arg);
args.add(new Pair(arg.trim(), index));
last = p+1;
}
p++;
break;
}
}
if ( targetChar==-1 && p<=n ) {
String arg = actionText.substring(last, p).trim();
int index = last;
while (index < p && Character.isWhitespace(actionText.charAt(index))) {
index++;
}
//System.out.println("arg="+arg);
if ( arg.length()>0 ) {
args.add(new Pair(arg.trim(), index));
}
}
p++;
return p;
}
}
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