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/*
* Anarres C Preprocessor
* Copyright (c) 2007-2008, Shevek
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package org.anarres.cpp;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* A macro object.
*
* This encapsulates a name, an argument count, and a token stream
* for replacement. The replacement token stream may contain the
* extra tokens {@link Token#M_ARG} and {@link Token#M_STRING}.
*/
public class Macro {
private Source source;
private String name;
/* It's an explicit decision to keep these around here. We don't
* need to; the argument token type is M_ARG and the value
* is the index. The strings themselves are only used in
* stringification of the macro, for debugging. */
private List<String> args;
private boolean variadic;
private List<Token> tokens;
public Macro(Source source, String name) {
this.source = source;
this.name = name;
this.args = null;
this.variadic = false;
this.tokens = new ArrayList<Token>();
}
public Macro(String name) {
this(null, name);
}
/**
* Sets the Source from which this macro was parsed.
*/
public void setSource(Source s) {
this.source = s;
}
/**
* Returns the Source from which this macro was parsed.
*
* This method may return null if the macro was not parsed
* from a regular file.
*/
public Source getSource() {
return source;
}
/**
* Returns the name of this macro.
*/
public String getName() {
return name;
}
/**
* Sets the arguments to this macro.
*/
public void setArgs(List<String> args) {
this.args = args;
}
/**
* Returns true if this is a function-like macro.
*/
public boolean isFunctionLike() {
return args != null;
}
/**
* Returns the number of arguments to this macro.
*/
public int getArgs() {
return args.size();
}
/**
* Sets the variadic flag on this Macro.
*/
public void setVariadic(boolean b) {
this.variadic = b;
}
/**
* Returns true if this is a variadic function-like macro.
*/
public boolean isVariadic() {
return variadic;
}
/**
* Adds a token to the expansion of this macro.
*/
public void addToken(Token tok) {
this.tokens.add(tok);
}
/**
* Adds a "paste" operator to the expansion of this macro.
*
* A paste operator causes the next token added to be pasted
* to the previous token when the macro is expanded.
* It is an error for a macro to end with a paste token.
*/
public void addPaste(Token tok) {
/*
* Given: tok0 ## tok1
* We generate: M_PASTE, tok0, tok1
* This extends as per a stack language:
* tok0 ## tok1 ## tok2 ->
* M_PASTE, tok0, M_PASTE, tok1, tok2
*/
this.tokens.add(tokens.size() - 1, tok);
}
/* pp */ List<Token> getTokens() {
return tokens;
}
/* Paste tokens are inserted before the first of the two pasted
* tokens, so it's a kind of bytecode notation. This method
* swaps them around again. We know that there will never be two
* sequential paste tokens, so a boolean is sufficient. */
public String getText() {
StringBuilder buf = new StringBuilder();
boolean paste = false;
for (Token tok : tokens) {
if (tok.getType() == Token.M_PASTE) {
assert paste == false : "Two sequential pastes.";
paste = true;
continue;
} else {
buf.append(tok.getText());
}
if (paste) {
buf.append(" #" + "# ");
paste = false;
}
// buf.append(tokens.get(i));
}
return buf.toString();
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder(name);
if (args != null) {
buf.append('(');
Iterator<String> it = args.iterator();
while (it.hasNext()) {
buf.append(it.next());
if (it.hasNext())
buf.append(", ");
else if (isVariadic())
buf.append("...");
}
buf.append(')');
}
if (!tokens.isEmpty()) {
buf.append(" => ").append(getText());
}
return buf.toString();
}
}
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