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org.daisy.pipeline.css.CounterStyle Maven / Gradle / Ivy
package org.daisy.pipeline.css;
import java.util.ArrayList;
import java.util.function.Supplier;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import com.google.common.collect.Iterables;
import cz.vutbr.web.css.Declaration;
import cz.vutbr.web.css.Term;
import cz.vutbr.web.css.TermFunction;
import cz.vutbr.web.css.TermIdent;
import cz.vutbr.web.css.TermInteger;
import cz.vutbr.web.css.TermString;
// we use some classes from braille-css because they are not available in jStyleParser (but they are
// not specific to braille CSS)
import org.daisy.braille.css.InlineStyle;
import org.daisy.braille.css.RuleCounterStyle;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.unbescape.css.CssEscape;
public class CounterStyle {
private enum System {
ALPHABETIC,
NUMERIC,
CYCLIC,
FIXED,
SYMBOLIC,
ADDITIVE
};
private static class AdditiveTuple {
final int weight;
final String symbol;
AdditiveTuple(int weight, String symbol) {
this.weight = weight;
this.symbol = symbol;
}
}
private final static Logger logger = LoggerFactory.getLogger(CounterStyle.class);
private final static Map predefinedCounterStyles = parseCounterStyleRules(
Iterables.filter(
new InlineStyle(
"@counter-style decimal {" + "\n" +
" system: numeric;" + "\n" +
" symbols: '0' '1' '2' '3' '4' '5' '6' '7' '8' '9';" + "\n" +
" negative: '-';" + "\n" +
"}" + "\n" +
"@counter-style lower-alpha {" + "\n" +
" system: alphabetic;" + "\n" +
" symbols: 'a' 'b' 'c' 'd' 'e' 'f' 'g' 'h' 'i' 'j'" + "\n" +
" 'k' 'l' 'm' 'n' 'o' 'p' 'q' 'r' 's' 't'" + "\n" +
" 'u' 'v' 'w' 'x' 'y' 'z';" + "\n" +
"}" + "\n" +
"@counter-style upper-alpha {" + "\n" +
" system: alphabetic;" + "\n" +
" symbols: 'A' 'B' 'C' 'D' 'E' 'F' 'G' 'H' 'I' 'J'" + "\n" +
" 'K' 'L' 'M' 'N' 'O' 'P' 'Q' 'R' 'S' 'T'" + "\n" +
" 'U' 'V' 'W' 'X' 'Y' 'Z';" + "\n" +
"}" + "\n" +
"@counter-style lower-roman {" + "\n" +
" system: additive;" + "\n" +
" range: 1 3999;" + "\n" +
" additive-symbols: 1000 'm', 900 'cm', 500 'd', 400 'cd'," + "\n" +
" 100 'c', 90 'xc', 50 'l', 40 'xl'," + "\n" +
" 10 'x', 9 'ix', 5 'v', 4 'iv', 1 'i';" + "\n" +
"}" + "\n" +
"@counter-style upper-roman {" + "\n" +
" system: additive;" + "\n" +
" range: 1 3999;" + "\n" +
" additive-symbols: 1000 'M', 900 'CM', 500 'D', 400 'CD'," + "\n" +
" 100 'C', 90 'XC', 50 'L', 40 'XL'," + "\n" +
" 10 'X', 9 'IX', 5 'V', 4 'IV', 1 'I';" + "\n" +
"}" + "\n" +
"@counter-style disc {" + "\n" +
" system: cyclic;" + "\n" +
" symbols: '\\2022';" + "\n" +
" suffix: ' ';" + "\n" +
"}"
), RuleCounterStyle.class));
// numeric
public final static CounterStyle DECIMAL = predefinedCounterStyles.get("decimal");
// alphabetic
public final static CounterStyle LOWER_ALPHA = predefinedCounterStyles.get("lower-alpha");
public final static CounterStyle UPPER_ALPHA = predefinedCounterStyles.get("upper-alpha");
public final static CounterStyle LOWER_ROMAN = predefinedCounterStyles.get("lower-roman");
public final static CounterStyle UPPER_ROMAN = predefinedCounterStyles.get("upper-roman");
// cyclic
public final static CounterStyle DISC = predefinedCounterStyles.get("disc");
private final System system;
private final List symbols;
private final List additiveSymbols;
private final String negative;
private final Supplier fallback;
private final String prefix;
private final String suffix;
/**
* Create a CounterStyle from a symbols() function
*
* @param term assumed to be a "symbols" function
*/
private CounterStyle(TermFunction term) throws IllegalArgumentException {
System system;
List> symbols;
if (term.size() > 0 && term.get(0) instanceof TermIdent) {
system = readSystem((TermIdent)term.get(0));
if (system == System.ADDITIVE)
throw new IllegalArgumentException("system 'additive' not supported in symbols() function");
symbols = term.subList(1, term.size());
} else {
system = System.SYMBOLIC;
symbols = term;
}
this.symbols = readSymbols(symbols);
this.additiveSymbols = null;
this.system = system;
this.negative = "-";
this.fallback = () -> DECIMAL;
this.prefix = "";
this.suffix = " ";
}
/**
* Create a CounterStyle from a @counter-style rule
*/
// FIXME: the "range" descriptor is not taken into account
// FIXME: the "text-transform" descriptor (from braille CSS) is not taken into account
private CounterStyle(RuleCounterStyle rule, Map fallbacks) throws IllegalArgumentException {
Declaration systemDecl = null;
Declaration symbolsDecl = null;
Declaration additiveSymbolsDecl = null;
Declaration negativeDecl = null;
Declaration fallbackDecl = null;
Declaration prefixDecl = null;
Declaration suffixDecl = null;
for (Declaration d : rule) {
String prop = d.getProperty();
if ("system".equals(prop)) {
if (systemDecl == null) systemDecl = d;
} else if ("symbols".equals(prop)) {
if (symbolsDecl == null) symbolsDecl = d;
} else if ("additive-symbols".equals(prop)) {
if (additiveSymbolsDecl == null) additiveSymbolsDecl = d;
} else if ("negative".equals(prop)) {
if (negativeDecl == null) negativeDecl = d;
} else if ("fallback".equals(prop)) {
if (fallbackDecl == null) fallbackDecl = d;
} else if ("prefix".equals(prop)) {
if (prefixDecl == null) prefixDecl = d;
} else if ("suffix".equals(prop)) {
if (suffixDecl == null) suffixDecl = d;
}
}
System system; {
system = null;
if (systemDecl != null)
try {
system = readSystem(systemDecl);
} catch (IllegalArgumentException e) {
logger.warn(e.getMessage());
}
if (system == null) system = System.SYMBOLIC;
}
List symbols; {
if (system != System.ADDITIVE) {
if (symbolsDecl != null)
symbols = readSymbols(symbolsDecl);
else
throw new IllegalArgumentException("Missing symbols descriptor");
} else
symbols = null;
}
List additiveSymbols; {
if (system == System.ADDITIVE) {
if (additiveSymbolsDecl != null)
additiveSymbols = readAdditiveSymbols(additiveSymbolsDecl);
else
throw new IllegalArgumentException("Missing symbols descriptor");
} else
additiveSymbols = null;
}
String negative; {
negative = null;
if (negativeDecl != null)
try {
negative = readSingleString("negative", negativeDecl).getValue();
} catch (IllegalArgumentException e) {
logger.warn(e.getMessage());
}
if (negative == null)
negative = "-";
}
String fallback; {
String ident = null;
if (fallbackDecl != null)
try {
ident = readSingleIdent("fallback", fallbackDecl).getValue();
} catch (IllegalArgumentException e) {
logger.warn(e.getMessage());
}
if (ident == null)
ident = "decimal";
fallback = ident;
}
String prefix; {
prefix = null;
if (prefixDecl != null)
try {
prefix = readSingleString("prefix", prefixDecl).getValue();
} catch (IllegalArgumentException e) {
logger.warn(e.getMessage());
}
if (prefix == null)
prefix = "";
}
String suffix; {
suffix = null;
if (suffixDecl != null)
try {
suffix = readSingleString("suffix", suffixDecl).getValue();
} catch (IllegalArgumentException e) {
logger.warn(e.getMessage());
}
if (suffix == null)
suffix = ". "; // note that for braille CSS this should be the empty string
}
this.system = system;
this.symbols = symbols;
this.additiveSymbols = additiveSymbols;
this.negative = negative;
this.fallback = memoize(
() -> {
if (fallbacks != null && fallbacks.containsKey(fallback))
return fallbacks.get(fallback);
else if (predefinedCounterStyles.containsKey(fallback))
return predefinedCounterStyles.get(fallback);
else
return DECIMAL;
}
);
this.prefix = prefix;
this.suffix = suffix;
}
private static final Map fromSymbolsCache = new HashMap<>();
/**
* Create a CounterStyle from a symbols() function
*/
public static CounterStyle fromSymbolsFunction(Term term) throws IllegalArgumentException {
if (term instanceof TermFunction) {
TermFunction function = (TermFunction)term;
if (function.getFunctionName().equals("symbols")) {
String k = function.toString();
CounterStyle s = fromSymbolsCache.get(k);
if (s == null) {
s = new CounterStyle(function);
fromSymbolsCache.put(k, s);
}
return s;
}
}
throw new IllegalArgumentException("argument must be a symbols() function");
}
/**
* Create a map of named CounterStyle from a set of @counter-style rules.
*/
public static Map parseCounterStyleRules(Iterable style) {
Map namedStyles = new HashMap<>();
for (RuleCounterStyle rule : style)
try {
namedStyles.put(rule.getName(), new CounterStyle(rule, namedStyles));
} catch (IllegalArgumentException e) {
logger.warn(e.getMessage());
}
return namedStyles;
}
public String format(int counterValue) {
switch (system) {
case ALPHABETIC: {
Optional formatted = counterRepresentationAlphabetic(counterValue, symbols);
if (formatted.isPresent())
return formatted.get();
break; }
case NUMERIC:
return counterRepresentationNumeric(counterValue, symbols, negative);
case CYCLIC:
return counterRepresentationCyclic(counterValue, symbols);
case FIXED: {
Optional formatted = counterRepresentationFixed(counterValue, symbols);
if (formatted.isPresent())
return formatted.get();
break; }
case SYMBOLIC: {
Optional formatted = counterRepresentationSymbolic(counterValue, symbols);
if (formatted.isPresent())
return formatted.get();
break; }
case ADDITIVE: {
Optional formatted = counterRepresentationAdditive(counterValue, additiveSymbols);
if (formatted.isPresent())
return formatted.get();
break; }
default:
throw new IllegalStateException(); // can not happen
}
if (fallback.get() == null || fallback.get() == this)
throw new IllegalStateException(); // can not happen
return fallback.get().format(counterValue);
}
public String format(int counterValue, boolean withPrefixAndSuffix) {
// prefix and suffix always come from the specified counter-style, even if the actual
// representation is constructed by a fallback style
if (withPrefixAndSuffix)
return prefix + format(counterValue) + suffix;
else
return format(counterValue);
}
/* ============ private ========================================================= */
private static System readSystem(List> terms) throws IllegalArgumentException {
return readSystem(readSingleIdent("system", terms));
}
private static System readSystem(TermIdent ident) throws IllegalArgumentException {
String system = ident.getValue();
try {
return System.valueOf(system.toUpperCase());
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException("Invalid system: " + system);
}
}
private static List readSymbols(List> terms) throws IllegalArgumentException {
List symbols = new ArrayList<>();
for (Term t : terms) {
if (t instanceof TermString)
symbols.add(((TermString)t).getValue());
else if (t instanceof TermIdent)
symbols.add(CssEscape.unescapeCss(((TermIdent)t).getValue()));
else
throw new IllegalArgumentException("Invalid symbol: " + t);
}
if (symbols.isEmpty())
throw new IllegalArgumentException("Empty symbols list");
return symbols;
}
private static List readAdditiveSymbols(List> terms) throws IllegalArgumentException {
List symbols = new ArrayList<>();
Iterator> tt = terms.iterator();
int prevWeight = -1;
while (tt.hasNext()) {
Term t = tt.next();
if (t instanceof TermInteger) {
int weight = ((TermInteger)t).getIntValue();
if (prevWeight >= 0 && weight > prevWeight)
throw new IllegalArgumentException(
"Invalid additive tuple: expected integer weight greater than " + prevWeight + " but got " + t);
prevWeight = weight;
if (tt.hasNext()) {
t = tt.next();
if (t instanceof TermString) {
String symbol = ((TermString)t).getValue();
symbols.add(new AdditiveTuple(weight, symbol));
} else
throw new IllegalArgumentException("Invalid additive tuple: expected symbol but got " + t);
} else
throw new IllegalArgumentException("Invalid additive tuple: expected symbol");
} else
throw new IllegalArgumentException("Invalid additive tuple: expected integer weight but got " + t);
}
if (symbols.isEmpty())
throw new IllegalArgumentException("Empty additive-symbols list");
return symbols;
}
private static TermIdent readSingleIdent(String property, List> terms) throws IllegalArgumentException {
if (terms.size() != 1 || !(terms.get(0) instanceof TermIdent))
throw new IllegalArgumentException("Invalid " + property + ": " + CssSerializer.serializeTermList(terms));
return (TermIdent)terms.get(0);
}
private static TermString readSingleString(String property, List> terms) throws IllegalArgumentException {
if (terms.size() != 1 || !(terms.get(0) instanceof TermString))
throw new IllegalArgumentException("Invalid " + property + ": " + CssSerializer.serializeTermList(terms));
return (TermString)terms.get(0);
}
private static int mod(int a, int n) {
int result = a % n;
if (result < 0)
result += n;
return result;
}
private static Supplier memoize(final Supplier supplier) {
return new Memoize() {
protected T _get() {
return supplier.get();
}
@Override
public String toString() {
return "memoize( " + supplier + " )";
}
};
}
private static abstract class Memoize implements Supplier {
private boolean computed = false;
private T value = null;
protected abstract T _get();
public final T get() {
if (!computed) {
value = _get();
computed = true;
}
return value;
}
}
/* ============ package private for tests ======================================= */
static Optional counterRepresentationAlphabetic(int counterValue, List symbols) {
if (counterValue < 1)
return Optional.empty();
if (counterValue > symbols.size())
return Optional.of(
counterRepresentationAlphabetic((counterValue - 1) / symbols.size(), symbols).get()
+ symbols.get(mod(counterValue - 1, symbols.size())));
else
return Optional.of(symbols.get(counterValue - 1));
}
static String counterRepresentationCyclic(int counterValue, List symbols) {
return symbols.get(mod(counterValue - 1, symbols.size()));
}
static Optional counterRepresentationFixed(int counterValue, List symbols) {
if (counterValue < 1 || counterValue > symbols.size())
return Optional.empty();
else
return Optional.of(symbols.get(counterValue - 1));
}
static String counterRepresentationNumeric(int counterValue, List symbols, String negative) {
if (counterValue < 0)
return negative + counterRepresentationNumeric(- counterValue, symbols, negative);
if (counterValue >= symbols.size())
return counterRepresentationNumeric(counterValue / symbols.size(), symbols, negative)
+ symbols.get(mod(counterValue, symbols.size()));
else
return symbols.get(counterValue);
}
static Optional counterRepresentationSymbolic(int counterValue, List symbols) {
if (counterValue < 1)
return Optional.empty();
String symbol = symbols.get(mod(counterValue - 1, symbols.size()));
String s = symbol;
for (int i = 0; i < ((counterValue - 1) / symbols.size()); i++)
s += symbol;
return Optional.of(s);
}
static Optional counterRepresentationAdditive(int counterValue, List symbols) {
if (counterValue < 0)
return Optional.empty();
int rest = counterValue;
String s = "";
for (AdditiveTuple tuple : symbols) {
if (tuple.weight == 0) {
if (rest == 0 && s.isEmpty())
s += tuple.symbol;
} else {
for (int i = 0; i < rest / tuple.weight; i++)
s += tuple.symbol;
rest = mod(rest, tuple.weight);
if (rest == 0 && !s.isEmpty())
break;
}
}
if (rest != 0 || s.isEmpty())
return Optional.empty();
return Optional.of(s);
}
}
