cz.vutbr.web.csskit.OutputUtil Maven / Gradle / Ivy
package cz.vutbr.web.csskit;
import java.util.List;
import cz.vutbr.web.css.PrettyOutput;
import cz.vutbr.web.css.Term;
import cz.vutbr.web.css.TermOperator;
/**
* Helper class for generation output for given CSS rules
* @author kapy
*
*/
public class OutputUtil {
public static final String EMPTY_DELIM = "";
public static final String SPACE_DELIM = " ";
public static final String DEPTH_DELIM = "\t";
public static final String QUERY_DELIM = " AND ";
public static final String RULE_OPENING = " {\n";
public static final String RULE_CLOSING = "}\n";
public static final String MEDIA_DELIM = ", ";
public static final String SELECTOR_DELIM = ", ";
public static final String IMPORT_KEYWORD = "@import ";
public static final String URL_OPENING = "url('";
public static final String URL_CLOSING = "')";
public static final String LINE_CLOSING = ";\n";
public static final String NEW_LINE = "\n";
public static final String MEDIA_KEYWORD = "@media ";
public static final String KEYFRAMES_KEYWORD = "@keyframes ";
public static final String RULE_DELIM = "\n";
public static final String CHARSET_KEYWORD = "@charset ";
public static final String CHARSET_OPENING = "\"";
public static final String CHARSET_CLOSING = "\";\n";
public static final String PROPERTY_OPENING = ": ";
public static final String PROPERTY_CLOSING = ";\n";
public static final String IMPORTANT_KEYWORD = "!important";
public static final String PAGE_KEYWORD = "@page";
public static final String PSEUDO_OPENING = ":";
public static final String PAGE_CLOSING = "";
public static final String VIEWPORT_KEYWORD = "@viewport";
public static final String FONT_FACE_KEYWORD = "@font-face";
public static final String FUNCTION_OPENING = "(";
public static final String FUNCTION_CLOSING = ")";
public static final String STRING_OPENING = "'";
public static final String STRING_CLOSING = "'";
public static final String ATTRIBUTE_OPENING = "[";
public static final String ATTRIBUTE_CLOSING = "]";
public static final String PERCENT_SIGN = "%";
public static final String HASH_SIGN = "#";
public static final String MARGIN_AREA_OPENING = "@";
public static final String MEDIA_EXPR_OPENING = "(";
public static final String MEDIA_EXPR_CLOSING = ")";
public static final String MEDIA_FEATURE_DELIM = ": ";
public static final String CALC_KEYWORD = "calc";
public static final String RECT_KEYWORD = "rect";
/**
* Appends string multiple times to buffer
* @param sb StringBuilder to be modified
* @param append String to be added
* @param times Number of times append is added
* @return Modified StringBuilder sb to allow chaining
*/
public static StringBuilder appendTimes(StringBuilder sb, String append, int times) {
for(;times>0; times--)
sb.append(append);
return sb;
}
/**
* Appends all elements of array to buffer, separated by delimiter
* @param Type of elements stored in array
* @param sb StringBuilder to be modified
* @param array Array of elements
* @param delimiter Delimiter to separate elements
* @return Modified sb to allow chaining
*/
public static StringBuilder appendArray(StringBuilder sb, T[] array, String delimiter) {
boolean firstRun = true;
for(T elem: array) {
if(!firstRun)
sb.append(delimiter);
else
firstRun = false;
sb.append(elem.toString());
}
return sb;
}
/**
* Appends all elements of list to buffer, separated by delimiter
* @param Type of elements stored in list
* @param sb StringBuilder to be modified
* @param list List of elements
* @param delimiter Delimiter to separate elements
* @return Modified sb to allow chaining
*/
public static StringBuilder appendList(StringBuilder sb, List list, String delimiter) {
boolean firstRun = true;
for(T elem: list) {
if(!firstRun)
sb.append(delimiter);
else
firstRun = false;
sb.append(elem.toString());
}
return sb;
}
/**
* Appends of elements of list to list, separater by delimiter.
* Uses depth parameter to make output nicer for each element
* @param List of elements, which implements Rule
* @param sb StringBuilder to be modified
* @param list List of elements
* @param delimiter Delimeter between elements
* @param depth Depth of each element
* @return Modified sb to allow chaining
*/
public static StringBuilder appendList(
StringBuilder sb, List list,
String delimiter, int depth) {
boolean firstRun = true;
for(T elem: list) {
if(!firstRun)
sb.append(delimiter);
else
firstRun = false;
sb.append(elem.toString(depth));
}
return sb;
}
/**
* Appends the calc() function arguments to a string builder.
* @param sb the string builder to be modified
* @param args the calc arguments
* @return Modified sb to allow chaining
*/
public static StringBuilder appendCalcArgs(StringBuilder sb, CalcArgs args) {
final String astr = args.evaluate(CalcArgs.stringEvaluator);
if (!astr.startsWith(FUNCTION_OPENING)) {
sb.append(FUNCTION_OPENING);
sb.append(astr);
sb.append(FUNCTION_CLOSING);
} else {
sb.append(astr);
}
return sb;
}
/**
* Appends the formatted list of function arguments to a string builder. The individual
* arguments are separated by spaces with the exception of commas.
* @param sb the string builder to be modified
* @param list the list of function arguments
* @return Modified sb to allow chaining
*/
public static StringBuilder appendFunctionArgs(StringBuilder sb, List> list) {
Term prev = null, pprev = null;
for (Term elem : list) {
boolean sep = true;
if (elem instanceof TermOperator && ((TermOperator) elem).getValue() == ',')
sep = false; //no spaces before commas
if ((prev != null && prev instanceof TermOperator && ((TermOperator) prev).getValue() == '-')
&& (pprev == null || pprev instanceof TermOperator)) //nothing or an operator before -
sep = false; //no spaces after unary minus
if (prev != null && sep)
sb.append(SPACE_DELIM);
pprev = prev;
prev = elem;
sb.append(elem.toString());
}
return sb;
}
}