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package com.modulus.dataread.expressions.impl;
import com.modulus.dataread.expressions.ParseRules;
/**
* Class which implements ParseRules with rules
* of a language which is very close to the C Programming
* Language and others based off it.
*
* @author jrahm
*/
public abstract class AbstractParseRules implements ParseRules{
private static final String w = "\\s";
private int lineNumber = 0;
/*
* the code this class will follow
*/
private String code;
/*
* value which tells this class
* if it is in quotes or not.
*/
private boolean inQuotes = false;
/*
* value which dictates if the parser
* is in comments.
*/
private boolean inComments = false;
/*
* this tells if the parser is in
* a comment delimited by '//'
*/
private boolean inLineComment = false;
/**
* Constructs a new CBasedParseRules object with <code>code</code>
* as the code which is being parsed.
*
* @param code the code to be parsed.
*/
public AbstractParseRules(String code){
this.code = code;
format();
deleteComments();
}
@Override
public boolean closeFolder(int off) {
return code.startsWith(this.getCloseFolderString(), off);
}
@Override
public boolean inComment() {
return inComments || inLineComment;
}
@Override
public boolean inQuotes() {
return inQuotes;
}
@Override
public boolean openFolder(int off) {
return code.startsWith( this.getOpenFolderString(), off );
}
/*
* this is where most of the logic
* goes for this class, this method is
* what dictates the flow of the parser
* and whether or not the parser is in
* quotes or comments etc.
*
* @see com.modulus.dataread.expressions.ParseRules#read(int)
*/
@Override
public int read(int off) {
// Here we will handle to see if the parser
// has run into a string literal.
// System.out.print( code.charAt(off) );
if(code.charAt(off) == '"'){
if( off == 0 || code.charAt(off - 1) != '\\' ){
inQuotes = !inQuotes;
}
}
return 1;
}
public boolean statementTerminated( int off ){
boolean tmp = code.startsWith( this.getStatementTerminatingCharacter(), off ) && !inQuotes();
// if(tmp) {
// System.out.printf("%s\t%s\t%s\n", code.substring(off), off, inQuotes );
// }
return tmp;
}
@Override
public void format() {
// for most C-based languages white space can just be
// Truncated like so.
// this.code = this.code.replaceAll(w+"+\n"+w+"+", "\n");
this.code = this.code.replace('\n', '\u0088');
// this.code = this.code.replaceAll(w+"+", " ");
// this.code = this.code.replaceAll(w+"*\\}"+w+"*", "}");
// this.code = this.code.replaceAll(w+"*;"+w+"*", ";");
StringBuffer total = new StringBuffer();
int i = 0;
int old = 0;
boolean inQuotes = false;
while( i != this.code.length() ) {
old = i;
i = code.indexOf('"', i+1);
if( i == -1 )
i = this.code.length();
String sub = code.substring(old, i);
if(!inQuotes) {
sub = sub.replaceAll(w+"+", " ");
sub = sub.replaceAll(w+"*\\}"+w+"*", "}");
sub = sub.replaceAll(w+"*;"+w+"*", ";");
}
total.append(sub);
inQuotes = !inQuotes;
}
total.append( code.substring(old) );
code = total.toString();
//this.code = this.code.replaceAll("[^;]\\}", ";}");
// System.out.println("Format: " + this.code);
}
public String getCode(){
return code.replace('\u0088', '\n');
}
@Override
public int getLineNumber() {
return lineNumber;
}
private void deleteComments(){
StringBuffer code2 = new StringBuffer();
for( int i = 0;i < code.length(); i ++){
if(code.startsWith( this.getCommentOpen(), i )){
while(!code.startsWith( this.getCommentClose(), i)){
if(code.charAt(i) == '\u0088')
code2.append(code.charAt(i));
i ++;
}
i += this.getCommentClose().length();
}
if(code.startsWith( this.getLineCommentDelimeter(), i)){
while(code.charAt(i) != '\u0088'){
i++;
}
}
code2.append( code.charAt(i) );
}
code = code2.toString();
}
public abstract String getOpenFolderString();
public abstract String getCloseFolderString();
public abstract String getStatementTerminatingCharacter();
public abstract String getStringDelimiter();
public abstract String getEscapeSequence();
public abstract String getCommentOpen();
public abstract String getCommentClose();
public abstract String getLineCommentDelimeter();
}
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