BaseHelper.java
/*
** Module : BaseHelper.java
** Abstract : provides common compatibility helper features
**
** Copyright (c) 2007-2025, Golden Code Development Corporation.
**
** -#- -I- --Date-- --JPRM-- ----------------------------------Description-----------------------------------
** 001 GES 20070822 @34962 Provides common compatibility helper features.
** 002 GES 20250103 Added a parameter to closeHTML() to differentiate end of line output.
*/
/*
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU Affero General Public License as
** published by the Free Software Foundation, either version 3 of the
** License, or (at your option) any later version.
**
** This program 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 Affero General Public License for more details.
**
** You may find a copy of the GNU Affero GPL version 3 at the following
** location: https://www.gnu.org/licenses/agpl-3.0.en.html
**
** Additional terms under GNU Affero GPL version 3 section 7:
**
** Under Section 7 of the GNU Affero GPL version 3, the following additional
** terms apply to the works covered under the License. These additional terms
** are non-permissive additional terms allowed under Section 7 of the GNU
** Affero GPL version 3 and may not be removed by you.
**
** 0. Attribution Requirement.
**
** You must preserve all legal notices or author attributions in the covered
** work or Appropriate Legal Notices displayed by works containing the covered
** work. You may not remove from the covered work any author or developer
** credit already included within the covered work.
**
** 1. No License To Use Trademarks.
**
** This license does not grant any license or rights to use the trademarks
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** Corporation or FWD. All modified versions must contain the notices of
** attribution required in this license.
*/
package com.goldencode.p2j.e4gl;
import java.util.*;
/**
* Provides common compatibility helper features. This class is a complete,
* working implementation of the compatibility interface. However, it does
* not define full compatibility with any of the known implementations.
*/
public class BaseHelper
implements CompatibilityHelper
{
/** Configuration to be honored. */
protected Options opts = null;
/** Replacement mappings for escaping unsafe HTML characters. */
protected Map<String, String> unsafe = new LinkedHashMap<String, String>();
/** Replacement mappings for removing HTML entities. */
protected Map<String, String> entities = new HashMap<String, String>();
/**
* Provides the known configuration to the helper and allows it to
* prepare for use. This must be called before any other method can be
* used.
*
* @param opts
* The configuration.
*/
public void initialize(Options opts)
{
this.opts = opts;
// order is critical here
unsafe.put("~", "~~");
unsafe.put(";", "~;");
unsafe.put("\\{", "~{");
unsafe.put("}", "~}");
unsafe.put("'", "~'");
if ("unix".equalsIgnoreCase(opts.getOpsys()))
{
// each \ character must be duplicated 4X because it is an escape
// character for both Java and regex
unsafe.put("\\\\", "\\\\\\\\");
}
entities.put("&", "&");
entities.put("&", "&");
entities.put(""", "\"");
entities.put(""", "\"");
entities.put("<", "<");
entities.put("<", "<");
entities.put(">", ">");
entities.put(">", ">");
entities.put("'", "\'");
entities.put("'", "\'");
}
/**
* Return the filename suffix (extension) to be used.
*
* @return The filename extension to use based on the known options.
*/
public String suffix()
{
return opts.isInclude() ? ".i" : ".w";
}
/**
* Return the text for the header of the generated file. This is output
* before any parsed content.
*
* @return Always the empty string.
*/
public String header()
{
return "";
}
/**
* Return the text used to start a line of raw HTML output.
*
* @param content
* <code>true</code> if there is HTML content that is about to
* be emitted on the line, <code>false</code> to handle the
* no content case (just start the line, without any
* content prefix text).
*
* @return The text to use based on the known options.
*/
public String openHTML(boolean content)
{
return String.format("{&OUT} %s", content ? "'" : "");
}
/**
* Return the text used to end a line of raw HTML output.
*
* @param content
* <code>true</code> if there is content that needs to be
* finished on the line, <code>false</code> to handle the
* no content case (just terminate the line, without any
* content termination text).
* @param eol
* <code>true</code> if the content is at the end of the line.
*
* @return The text to use based on the known options.
*/
public String closeHTML(boolean content, boolean eol)
{
String end = eol ? "~n" : "";
return content ? end + "'." : ".";
}
/**
* Convert any unsafe characters (in the given HTML text) into equivalents
* that are safe to embed in a 4GL string literal and return that converted
* text.
*
* @return The replacement text.
*/
public String escapeHTML(String html)
{
return replace(unsafe, html);
}
/**
* Convert any HTML entities (in the given E4GL text) into the equivalent
* characters.
*
* @return The replacement text with all conversion applied.
*/
public String entityConvert(String e4gl)
{
return replace(entities, e4gl);
}
/**
* Return the text used to start the output of an embedded 4GL expression.
*
* @return The text to use based on the known options.
*/
public String openExprEscape()
{
return "'";
}
/**
* Return the text used to end the output of an embedded 4GL expression.
*
* @return The text to use based on the known options.
*/
public String closeExprEscape()
{
return "'";
}
/**
* Return the text used to start a comment that removes the start or end
* tag for a statement or expression escape.
*
* @param expr
* <code>true</code> if this is an expression escape,
* <code>false</code> for a statement escape.
*
* @return The text to use based on the known options. <code>null</code>
* if the escape should be removed instead of commented.
*/
public String openComment(boolean expr)
{
return "/* ";
}
/**
* Return the text used to end a comment that removes the start or end tag
* for a statement or expression escape.
*
* @param expr
* <code>true</code> if this is an expression escape,
* <code>false</code> for a statement escape.
*
* @return The text to use based on the known options. <code>null</code>
* if the escape should be removed instead of commented.
*/
public String closeComment(boolean expr)
{
return " */";
}
/**
* Return the text used to start a comment that removes the META or
* WSMETA element with an HTTP-EQUIV attribute that is set to
* CONTENT-TYPE.
*
* @return The text to use based on the known options. Return the empty
* string if the element should be left behind instead of
* commented.
*/
public String openContentTypeComment()
{
return opts.isKeepContentType() ? "" : "<!-- E4GL Disabled: ";
}
/**
* Return the text used to end a comment that removes the META or
* WSMETA element with an HTTP-EQUIV attribute that is set to
* CONTENT-TYPE.
*
* @return The text to use based on the known options. Return the empty
* string if the element should be left behind instead of
* commented.
*/
public String closeContentTypeComment()
{
return opts.isKeepContentType() ? "" : " -->";
}
/**
* Return the text for the footer of the generated file. This is output
* after all parsed content.
*
* @return Always the empty string.
*/
public String footer()
{
return "";
}
/**
* Use the mapped keys to convert any matching characters (in the given
* text) into the equivalent mapped value. Then return that converted
* text.
*
* @return The replacement text.
*/
protected String replace(Map<String, String> replace, String txt)
{
Iterator<String> keylist = replace.keySet().iterator();
while (keylist.hasNext())
{
String key = keylist.next();
txt = txt.replaceAll(key, replace.get(key));
}
return txt;
}
}