001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.gui.mappaint.mapcss;
003
004import java.awt.Color;
005import java.lang.annotation.ElementType;
006import java.lang.annotation.Retention;
007import java.lang.annotation.RetentionPolicy;
008import java.lang.annotation.Target;
009import java.lang.reflect.Array;
010import java.lang.reflect.InvocationTargetException;
011import java.lang.reflect.Method;
012import java.nio.charset.StandardCharsets;
013import java.util.ArrayList;
014import java.util.Arrays;
015import java.util.Collection;
016import java.util.Collections;
017import java.util.List;
018import java.util.Locale;
019import java.util.Objects;
020import java.util.TreeSet;
021import java.util.function.Function;
022import java.util.regex.Matcher;
023import java.util.regex.Pattern;
024import java.util.zip.CRC32;
025
026import org.openstreetmap.josm.Main;
027import org.openstreetmap.josm.actions.search.SearchCompiler;
028import org.openstreetmap.josm.actions.search.SearchCompiler.Match;
029import org.openstreetmap.josm.actions.search.SearchCompiler.ParseError;
030import org.openstreetmap.josm.data.coor.LatLon;
031import org.openstreetmap.josm.data.osm.Node;
032import org.openstreetmap.josm.data.osm.OsmPrimitive;
033import org.openstreetmap.josm.data.osm.Way;
034import org.openstreetmap.josm.gui.mappaint.Cascade;
035import org.openstreetmap.josm.gui.mappaint.Environment;
036import org.openstreetmap.josm.gui.mappaint.MapPaintStyles;
037import org.openstreetmap.josm.gui.util.RotationAngle;
038import org.openstreetmap.josm.io.XmlWriter;
039import org.openstreetmap.josm.tools.AlphanumComparator;
040import org.openstreetmap.josm.tools.ColorHelper;
041import org.openstreetmap.josm.tools.Geometry;
042import org.openstreetmap.josm.tools.JosmRuntimeException;
043import org.openstreetmap.josm.tools.RightAndLefthandTraffic;
044import org.openstreetmap.josm.tools.SubclassFilteredCollection;
045import org.openstreetmap.josm.tools.Territories;
046import org.openstreetmap.josm.tools.Utils;
047
048/**
049 * Factory to generate {@link Expression}s.
050 * <p>
051 * See {@link #createFunctionExpression}.
052 */
053public final class ExpressionFactory {
054
055    /**
056     * Marks functions which should be executed also when one or more arguments are null.
057     */
058    @Target(ElementType.METHOD)
059    @Retention(RetentionPolicy.RUNTIME)
060    static @interface NullableArguments {}
061
062    private static final List<Method> arrayFunctions = new ArrayList<>();
063    private static final List<Method> parameterFunctions = new ArrayList<>();
064    private static final List<Method> parameterFunctionsEnv = new ArrayList<>();
065
066    static {
067        for (Method m : Functions.class.getDeclaredMethods()) {
068            Class<?>[] paramTypes = m.getParameterTypes();
069            if (paramTypes.length == 1 && paramTypes[0].isArray()) {
070                arrayFunctions.add(m);
071            } else if (paramTypes.length >= 1 && paramTypes[0].equals(Environment.class)) {
072                parameterFunctionsEnv.add(m);
073            } else {
074                parameterFunctions.add(m);
075            }
076        }
077        try {
078            parameterFunctions.add(Math.class.getMethod("abs", float.class));
079            parameterFunctions.add(Math.class.getMethod("acos", double.class));
080            parameterFunctions.add(Math.class.getMethod("asin", double.class));
081            parameterFunctions.add(Math.class.getMethod("atan", double.class));
082            parameterFunctions.add(Math.class.getMethod("atan2", double.class, double.class));
083            parameterFunctions.add(Math.class.getMethod("ceil", double.class));
084            parameterFunctions.add(Math.class.getMethod("cos", double.class));
085            parameterFunctions.add(Math.class.getMethod("cosh", double.class));
086            parameterFunctions.add(Math.class.getMethod("exp", double.class));
087            parameterFunctions.add(Math.class.getMethod("floor", double.class));
088            parameterFunctions.add(Math.class.getMethod("log", double.class));
089            parameterFunctions.add(Math.class.getMethod("max", float.class, float.class));
090            parameterFunctions.add(Math.class.getMethod("min", float.class, float.class));
091            parameterFunctions.add(Math.class.getMethod("random"));
092            parameterFunctions.add(Math.class.getMethod("round", float.class));
093            parameterFunctions.add(Math.class.getMethod("signum", double.class));
094            parameterFunctions.add(Math.class.getMethod("sin", double.class));
095            parameterFunctions.add(Math.class.getMethod("sinh", double.class));
096            parameterFunctions.add(Math.class.getMethod("sqrt", double.class));
097            parameterFunctions.add(Math.class.getMethod("tan", double.class));
098            parameterFunctions.add(Math.class.getMethod("tanh", double.class));
099        } catch (NoSuchMethodException | SecurityException ex) {
100            throw new JosmRuntimeException(ex);
101        }
102    }
103
104    private ExpressionFactory() {
105        // Hide default constructor for utils classes
106    }
107
108    /**
109     * List of functions that can be used in MapCSS expressions.
110     *
111     * First parameter can be of type {@link Environment} (if needed). This is
112     * automatically filled in by JOSM and the user only sees the remaining arguments.
113     * When one of the user supplied arguments cannot be converted the
114     * expected type or is null, the function is not called and it returns null
115     * immediately. Add the annotation {@link NullableArguments} to allow null arguments.
116     * Every method must be static.
117     */
118    @SuppressWarnings("UnusedDeclaration")
119    public static final class Functions {
120
121        private Functions() {
122            // Hide implicit public constructor for utility classes
123        }
124
125        /**
126         * Identity function for compatibility with MapCSS specification.
127         * @param o any object
128         * @return {@code o} unchanged
129         */
130        public static Object eval(Object o) { // NO_UCD (unused code)
131            return o;
132        }
133
134        /**
135         * Function associated to the numeric "+" operator.
136         * @param args arguments
137         * @return Sum of arguments
138         */
139        public static float plus(float... args) { // NO_UCD (unused code)
140            float res = 0;
141            for (float f : args) {
142                res += f;
143            }
144            return res;
145        }
146
147        /**
148         * Function associated to the numeric "-" operator.
149         * @param args arguments
150         * @return Substraction of arguments
151         */
152        public static Float minus(float... args) { // NO_UCD (unused code)
153            if (args.length == 0) {
154                return 0.0F;
155            }
156            if (args.length == 1) {
157                return -args[0];
158            }
159            float res = args[0];
160            for (int i = 1; i < args.length; ++i) {
161                res -= args[i];
162            }
163            return res;
164        }
165
166        /**
167         * Function associated to the numeric "*" operator.
168         * @param args arguments
169         * @return Multiplication of arguments
170         */
171        public static float times(float... args) { // NO_UCD (unused code)
172            float res = 1;
173            for (float f : args) {
174                res *= f;
175            }
176            return res;
177        }
178
179        /**
180         * Function associated to the numeric "/" operator.
181         * @param args arguments
182         * @return Division of arguments
183         */
184        public static Float divided_by(float... args) { // NO_UCD (unused code)
185            if (args.length == 0) {
186                return 1.0F;
187            }
188            float res = args[0];
189            for (int i = 1; i < args.length; ++i) {
190                if (args[i] == 0) {
191                    return null;
192                }
193                res /= args[i];
194            }
195            return res;
196        }
197
198        /**
199         * Creates a list of values, e.g., for the {@code dashes} property.
200         * @param args The values to put in a list
201         * @return list of values
202         * @see Arrays#asList(Object[])
203         */
204        public static List<Object> list(Object... args) { // NO_UCD (unused code)
205            return Arrays.asList(args);
206        }
207
208        /**
209         * Returns the number of elements in a list.
210         * @param lst the list
211         * @return length of the list
212         */
213        public static Integer count(List<?> lst) { // NO_UCD (unused code)
214            return lst.size();
215        }
216
217        /**
218         * Returns the first non-null object.
219         * The name originates from <a href="http://wiki.openstreetmap.org/wiki/MapCSS/0.2/eval">MapCSS standard</a>.
220         * @param args arguments
221         * @return the first non-null object
222         * @see Utils#firstNonNull(Object[])
223         */
224        @NullableArguments
225        public static Object any(Object... args) { // NO_UCD (unused code)
226            return Utils.firstNonNull(args);
227        }
228
229        /**
230         * Get the {@code n}th element of the list {@code lst} (counting starts at 0).
231         * @param lst list
232         * @param n index
233         * @return {@code n}th element of the list, or {@code null} if index out of range
234         * @since 5699
235         */
236        public static Object get(List<?> lst, float n) { // NO_UCD (unused code)
237            int idx = Math.round(n);
238            if (idx >= 0 && idx < lst.size()) {
239                return lst.get(idx);
240            }
241            return null;
242        }
243
244        /**
245         * Splits string {@code toSplit} at occurrences of the separator string {@code sep} and returns a list of matches.
246         * @param sep separator string
247         * @param toSplit string to split
248         * @return list of matches
249         * @see String#split(String)
250         * @since 5699
251         */
252        public static List<String> split(String sep, String toSplit) { // NO_UCD (unused code)
253            return Arrays.asList(toSplit.split(Pattern.quote(sep), -1));
254        }
255
256        /**
257         * Creates a color value with the specified amounts of {@code r}ed, {@code g}reen, {@code b}lue (arguments from 0.0 to 1.0)
258         * @param r the red component
259         * @param g the green component
260         * @param b the blue component
261         * @return color matching the given components
262         * @see Color#Color(float, float, float)
263         */
264        public static Color rgb(float r, float g, float b) { // NO_UCD (unused code)
265            try {
266                return new Color(r, g, b);
267            } catch (IllegalArgumentException e) {
268                Main.trace(e);
269                return null;
270            }
271        }
272
273        /**
274         * Creates a color value with the specified amounts of {@code r}ed, {@code g}reen, {@code b}lue, {@code alpha}
275         * (arguments from 0.0 to 1.0)
276         * @param r the red component
277         * @param g the green component
278         * @param b the blue component
279         * @param alpha the alpha component
280         * @return color matching the given components
281         * @see Color#Color(float, float, float, float)
282         */
283        public static Color rgba(float r, float g, float b, float alpha) { // NO_UCD (unused code)
284            try {
285                return new Color(r, g, b, alpha);
286            } catch (IllegalArgumentException e) {
287                Main.trace(e);
288                return null;
289            }
290        }
291
292        /**
293         * Create color from hsb color model. (arguments form 0.0 to 1.0)
294         * @param h hue
295         * @param s saturation
296         * @param b brightness
297         * @return the corresponding color
298         */
299        public static Color hsb_color(float h, float s, float b) { // NO_UCD (unused code)
300            try {
301                return Color.getHSBColor(h, s, b);
302            } catch (IllegalArgumentException e) {
303                Main.trace(e);
304                return null;
305            }
306        }
307
308        /**
309         * Creates a color value from an HTML notation, i.e., {@code #rrggbb}.
310         * @param html HTML notation
311         * @return color matching the given notation
312         */
313        public static Color html2color(String html) { // NO_UCD (unused code)
314            return ColorHelper.html2color(html);
315        }
316
317        /**
318         * Computes the HTML notation ({@code #rrggbb}) for a color value).
319         * @param c color
320         * @return HTML notation matching the given color
321         */
322        public static String color2html(Color c) { // NO_UCD (unused code)
323            return ColorHelper.color2html(c);
324        }
325
326        /**
327         * Get the value of the red color channel in the rgb color model
328         * @param c color
329         * @return the red color channel in the range [0;1]
330         * @see java.awt.Color#getRed()
331         */
332        public static float red(Color c) { // NO_UCD (unused code)
333            return Utils.colorInt2float(c.getRed());
334        }
335
336        /**
337         * Get the value of the green color channel in the rgb color model
338         * @param c color
339         * @return the green color channel in the range [0;1]
340         * @see java.awt.Color#getGreen()
341         */
342        public static float green(Color c) { // NO_UCD (unused code)
343            return Utils.colorInt2float(c.getGreen());
344        }
345
346        /**
347         * Get the value of the blue color channel in the rgb color model
348         * @param c color
349         * @return the blue color channel in the range [0;1]
350         * @see java.awt.Color#getBlue()
351         */
352        public static float blue(Color c) { // NO_UCD (unused code)
353            return Utils.colorInt2float(c.getBlue());
354        }
355
356        /**
357         * Get the value of the alpha channel in the rgba color model
358         * @param c color
359         * @return the alpha channel in the range [0;1]
360         * @see java.awt.Color#getAlpha()
361         */
362        public static float alpha(Color c) { // NO_UCD (unused code)
363            return Utils.colorInt2float(c.getAlpha());
364        }
365
366        /**
367         * Assembles the strings to one.
368         * @param args arguments
369         * @return assembled string
370         * @see Utils#join
371         */
372        @NullableArguments
373        public static String concat(Object... args) { // NO_UCD (unused code)
374            return Utils.join("", Arrays.asList(args));
375        }
376
377        /**
378         * Assembles the strings to one, where the first entry is used as separator.
379         * @param args arguments. First one is used as separator
380         * @return assembled string
381         * @see Utils#join
382         */
383        @NullableArguments
384        public static String join(String... args) { // NO_UCD (unused code)
385            return Utils.join(args[0], Arrays.asList(args).subList(1, args.length));
386        }
387
388        /**
389         * Joins a list of {@code values} into a single string with fields separated by {@code separator}.
390         * @param separator the separator
391         * @param values collection of objects
392         * @return assembled string
393         * @see Utils#join
394         */
395        public static String join_list(final String separator, final List<String> values) { // NO_UCD (unused code)
396            return Utils.join(separator, values);
397        }
398
399        /**
400         * Returns the value of the property {@code key}, e.g., {@code prop("width")}.
401         * @param env the environment
402         * @param key the property key
403         * @return the property value
404         */
405        public static Object prop(final Environment env, String key) { // NO_UCD (unused code)
406            return prop(env, key, null);
407        }
408
409        /**
410         * Returns the value of the property {@code key} from layer {@code layer}.
411         * @param env the environment
412         * @param key the property key
413         * @param layer layer
414         * @return the property value
415         */
416        public static Object prop(final Environment env, String key, String layer) {
417            return env.getCascade(layer).get(key);
418        }
419
420        /**
421         * Determines whether property {@code key} is set.
422         * @param env the environment
423         * @param key the property key
424         * @return {@code true} if the property is set, {@code false} otherwise
425         */
426        public static Boolean is_prop_set(final Environment env, String key) { // NO_UCD (unused code)
427            return is_prop_set(env, key, null);
428        }
429
430        /**
431         * Determines whether property {@code key} is set on layer {@code layer}.
432         * @param env the environment
433         * @param key the property key
434         * @param layer layer
435         * @return {@code true} if the property is set, {@code false} otherwise
436         */
437        public static Boolean is_prop_set(final Environment env, String key, String layer) {
438            return env.getCascade(layer).containsKey(key);
439        }
440
441        /**
442         * Gets the value of the key {@code key} from the object in question.
443         * @param env the environment
444         * @param key the OSM key
445         * @return the value for given key
446         */
447        public static String tag(final Environment env, String key) { // NO_UCD (unused code)
448            return env.osm == null ? null : env.osm.get(key);
449        }
450
451        /**
452         * Gets the first non-null value of the key {@code key} from the object's parent(s).
453         * @param env the environment
454         * @param key the OSM key
455         * @return first non-null value of the key {@code key} from the object's parent(s)
456         */
457        public static String parent_tag(final Environment env, String key) { // NO_UCD (unused code)
458            if (env.parent == null) {
459                if (env.osm != null) {
460                    // we don't have a matched parent, so just search all referrers
461                    for (OsmPrimitive parent : env.osm.getReferrers()) {
462                        String value = parent.get(key);
463                        if (value != null) {
464                            return value;
465                        }
466                    }
467                }
468                return null;
469            }
470            return env.parent.get(key);
471        }
472
473        /**
474         * Gets a list of all non-null values of the key {@code key} from the object's parent(s).
475         *
476         * The values are sorted according to {@link AlphanumComparator}.
477         * @param env the environment
478         * @param key the OSM key
479         * @return a list of non-null values of the key {@code key} from the object's parent(s)
480         */
481        public static List<String> parent_tags(final Environment env, String key) { // NO_UCD (unused code)
482            if (env.parent == null) {
483                if (env.osm != null) {
484                    final Collection<String> tags = new TreeSet<>(AlphanumComparator.getInstance());
485                    // we don't have a matched parent, so just search all referrers
486                    for (OsmPrimitive parent : env.osm.getReferrers()) {
487                        String value = parent.get(key);
488                        if (value != null) {
489                            tags.add(value);
490                        }
491                    }
492                    return new ArrayList<>(tags);
493                }
494                return Collections.emptyList();
495            }
496            return Collections.singletonList(env.parent.get(key));
497        }
498
499        /**
500         * Gets the value of the key {@code key} from the object's child.
501         * @param env the environment
502         * @param key the OSM key
503         * @return the value of the key {@code key} from the object's child, or {@code null} if there is no child
504         */
505        public static String child_tag(final Environment env, String key) { // NO_UCD (unused code)
506            return env.child == null ? null : env.child.get(key);
507        }
508
509        /**
510         * Determines whether the object has a tag with the given key.
511         * @param env the environment
512         * @param key the OSM key
513         * @return {@code true} if the object has a tag with the given key, {@code false} otherwise
514         */
515        public static boolean has_tag_key(final Environment env, String key) { // NO_UCD (unused code)
516            return env.osm.hasKey(key);
517        }
518
519        /**
520         * Returns the index of node in parent way or member in parent relation.
521         * @param env the environment
522         * @return the index as float. Starts at 1
523         */
524        public static Float index(final Environment env) { // NO_UCD (unused code)
525            if (env.index == null) {
526                return null;
527            }
528            return Float.valueOf(env.index + 1f);
529        }
530
531        /**
532         * Returns the role of current object in parent relation, or role of child if current object is a relation.
533         * @param env the environment
534         * @return role of current object in parent relation, or role of child if current object is a relation
535         * @see Environment#getRole()
536         */
537        public static String role(final Environment env) { // NO_UCD (unused code)
538            return env.getRole();
539        }
540
541        /**
542         * Returns the area of a closed way or multipolygon in square meters or {@code null}.
543         * @param env the environment
544         * @return the area of a closed way or multipolygon in square meters or {@code null}
545         * @see Geometry#computeArea(OsmPrimitive)
546         */
547        public static Float areasize(final Environment env) { // NO_UCD (unused code)
548            final Double area = Geometry.computeArea(env.osm);
549            return area == null ? null : area.floatValue();
550        }
551
552        /**
553         * Returns the length of the way in metres or {@code null}.
554         * @param env the environment
555         * @return the length of the way in metres or {@code null}.
556         * @see Way#getLength()
557         */
558        public static Float waylength(final Environment env) { // NO_UCD (unused code)
559            if (env.osm instanceof Way) {
560                return (float) ((Way) env.osm).getLength();
561            } else {
562                return null;
563            }
564        }
565
566        /**
567         * Function associated to the logical "!" operator.
568         * @param b boolean value
569         * @return {@code true} if {@code !b}
570         */
571        public static boolean not(boolean b) { // NO_UCD (unused code)
572            return !b;
573        }
574
575        /**
576         * Function associated to the logical "&gt;=" operator.
577         * @param a first value
578         * @param b second value
579         * @return {@code true} if {@code a &gt;= b}
580         */
581        public static boolean greater_equal(float a, float b) { // NO_UCD (unused code)
582            return a >= b;
583        }
584
585        /**
586         * Function associated to the logical "&lt;=" operator.
587         * @param a first value
588         * @param b second value
589         * @return {@code true} if {@code a &lt;= b}
590         */
591        public static boolean less_equal(float a, float b) { // NO_UCD (unused code)
592            return a <= b;
593        }
594
595        /**
596         * Function associated to the logical "&gt;" operator.
597         * @param a first value
598         * @param b second value
599         * @return {@code true} if {@code a &gt; b}
600         */
601        public static boolean greater(float a, float b) { // NO_UCD (unused code)
602            return a > b;
603        }
604
605        /**
606         * Function associated to the logical "&lt;" operator.
607         * @param a first value
608         * @param b second value
609         * @return {@code true} if {@code a &lt; b}
610         */
611        public static boolean less(float a, float b) { // NO_UCD (unused code)
612            return a < b;
613        }
614
615        /**
616         * Converts an angle in degrees to radians.
617         * @param degree the angle in degrees
618         * @return the angle in radians
619         * @see Math#toRadians(double)
620         */
621        public static double degree_to_radians(double degree) { // NO_UCD (unused code)
622            return Math.toRadians(degree);
623        }
624
625        /**
626         * Converts an angle diven in cardinal directions to radians.
627         * The following values are supported: {@code n}, {@code north}, {@code ne}, {@code northeast},
628         * {@code e}, {@code east}, {@code se}, {@code southeast}, {@code s}, {@code south},
629         * {@code sw}, {@code southwest}, {@code w}, {@code west}, {@code nw}, {@code northwest}.
630         * @param cardinal the angle in cardinal directions.
631         * @return the angle in radians
632         * @see RotationAngle#parseCardinalRotation(String)
633         */
634        public static Double cardinal_to_radians(String cardinal) { // NO_UCD (unused code)
635            try {
636                return RotationAngle.parseCardinalRotation(cardinal);
637            } catch (IllegalArgumentException ignore) {
638                Main.trace(ignore);
639                return null;
640            }
641        }
642
643        /**
644         * Determines if the objects {@code a} and {@code b} are equal.
645         * @param a First object
646         * @param b Second object
647         * @return {@code true} if objects are equal, {@code false} otherwise
648         * @see Object#equals(Object)
649         */
650        public static boolean equal(Object a, Object b) {
651            if (a.getClass() == b.getClass()) return a.equals(b);
652            if (a.equals(Cascade.convertTo(b, a.getClass()))) return true;
653            return b.equals(Cascade.convertTo(a, b.getClass()));
654        }
655
656        /**
657         * Determines if the objects {@code a} and {@code b} are not equal.
658         * @param a First object
659         * @param b Second object
660         * @return {@code false} if objects are equal, {@code true} otherwise
661         * @see Object#equals(Object)
662         */
663        public static boolean not_equal(Object a, Object b) { // NO_UCD (unused code)
664            return !equal(a, b);
665        }
666
667        /**
668         * Determines whether the JOSM search with {@code searchStr} applies to the object.
669         * @param env the environment
670         * @param searchStr the search string
671         * @return {@code true} if the JOSM search with {@code searchStr} applies to the object
672         * @see SearchCompiler
673         */
674        public static Boolean JOSM_search(final Environment env, String searchStr) { // NO_UCD (unused code)
675            Match m;
676            try {
677                m = SearchCompiler.compile(searchStr);
678            } catch (ParseError ex) {
679                Main.trace(ex);
680                return null;
681            }
682            return m.match(env.osm);
683        }
684
685        /**
686         * Obtains the JOSM'key {@link org.openstreetmap.josm.data.Preferences} string for key {@code key},
687         * and defaults to {@code def} if that is null.
688         * @param env the environment
689         * @param key Key in JOSM preference
690         * @param def Default value
691         * @return value for key, or default value if not found
692         */
693        public static String JOSM_pref(Environment env, String key, String def) { // NO_UCD (unused code)
694            return MapPaintStyles.getStyles().getPreferenceCached(key, def);
695        }
696
697        /**
698         * Tests if string {@code target} matches pattern {@code pattern}
699         * @param pattern The regex expression
700         * @param target The character sequence to be matched
701         * @return {@code true} if, and only if, the entire region sequence matches the pattern
702         * @see Pattern#matches(String, CharSequence)
703         * @since 5699
704         */
705        public static boolean regexp_test(String pattern, String target) { // NO_UCD (unused code)
706            return Pattern.matches(pattern, target);
707        }
708
709        /**
710         * Tests if string {@code target} matches pattern {@code pattern}
711         * @param pattern The regex expression
712         * @param target The character sequence to be matched
713         * @param flags a string that may contain "i" (case insensitive), "m" (multiline) and "s" ("dot all")
714         * @return {@code true} if, and only if, the entire region sequence matches the pattern
715         * @see Pattern#CASE_INSENSITIVE
716         * @see Pattern#DOTALL
717         * @see Pattern#MULTILINE
718         * @since 5699
719         */
720        public static boolean regexp_test(String pattern, String target, String flags) { // NO_UCD (unused code)
721            int f = 0;
722            if (flags.contains("i")) {
723                f |= Pattern.CASE_INSENSITIVE;
724            }
725            if (flags.contains("s")) {
726                f |= Pattern.DOTALL;
727            }
728            if (flags.contains("m")) {
729                f |= Pattern.MULTILINE;
730            }
731            return Pattern.compile(pattern, f).matcher(target).matches();
732        }
733
734        /**
735         * Tries to match string against pattern regexp and returns a list of capture groups in case of success.
736         * The first element (index 0) is the complete match (i.e. string).
737         * Further elements correspond to the bracketed parts of the regular expression.
738         * @param pattern The regex expression
739         * @param target The character sequence to be matched
740         * @param flags a string that may contain "i" (case insensitive), "m" (multiline) and "s" ("dot all")
741         * @return a list of capture groups if {@link Matcher#matches()}, or {@code null}.
742         * @see Pattern#CASE_INSENSITIVE
743         * @see Pattern#DOTALL
744         * @see Pattern#MULTILINE
745         * @since 5701
746         */
747        public static List<String> regexp_match(String pattern, String target, String flags) { // NO_UCD (unused code)
748            int f = 0;
749            if (flags.contains("i")) {
750                f |= Pattern.CASE_INSENSITIVE;
751            }
752            if (flags.contains("s")) {
753                f |= Pattern.DOTALL;
754            }
755            if (flags.contains("m")) {
756                f |= Pattern.MULTILINE;
757            }
758            return Utils.getMatches(Pattern.compile(pattern, f).matcher(target));
759        }
760
761        /**
762         * Tries to match string against pattern regexp and returns a list of capture groups in case of success.
763         * The first element (index 0) is the complete match (i.e. string).
764         * Further elements correspond to the bracketed parts of the regular expression.
765         * @param pattern The regex expression
766         * @param target The character sequence to be matched
767         * @return a list of capture groups if {@link Matcher#matches()}, or {@code null}.
768         * @since 5701
769         */
770        public static List<String> regexp_match(String pattern, String target) { // NO_UCD (unused code)
771            return Utils.getMatches(Pattern.compile(pattern).matcher(target));
772        }
773
774        /**
775         * Returns the OSM id of the current object.
776         * @param env the environment
777         * @return the OSM id of the current object
778         * @see OsmPrimitive#getUniqueId()
779         */
780        public static long osm_id(final Environment env) { // NO_UCD (unused code)
781            return env.osm.getUniqueId();
782        }
783
784        /**
785         * Translates some text for the current locale. The first argument is the text to translate,
786         * and the subsequent arguments are parameters for the string indicated by <code>{0}</code>, <code>{1}</code>, …
787         * @param args arguments
788         * @return the translated string
789         */
790        @NullableArguments
791        public static String tr(String... args) { // NO_UCD (unused code)
792            final String text = args[0];
793            System.arraycopy(args, 1, args, 0, args.length - 1);
794            return org.openstreetmap.josm.tools.I18n.tr(text, (Object[]) args);
795        }
796
797        /**
798         * Returns the substring of {@code s} starting at index {@code begin} (inclusive, 0-indexed).
799         * @param s The base string
800         * @param begin The start index
801         * @return the substring
802         * @see String#substring(int)
803         */
804        public static String substring(String s, /* due to missing Cascade.convertTo for int*/ float begin) { // NO_UCD (unused code)
805            return s == null ? null : s.substring((int) begin);
806        }
807
808        /**
809         * Returns the substring of {@code s} starting at index {@code begin} (inclusive)
810         * and ending at index {@code end}, (exclusive, 0-indexed).
811         * @param s The base string
812         * @param begin The start index
813         * @param end The end index
814         * @return the substring
815         * @see String#substring(int, int)
816         */
817        public static String substring(String s, float begin, float end) { // NO_UCD (unused code)
818            return s == null ? null : s.substring((int) begin, (int) end);
819        }
820
821        /**
822         * Replaces in {@code s} every {@code} target} substring by {@code replacement}.
823         * @param s The source string
824         * @param target The sequence of char values to be replaced
825         * @param replacement The replacement sequence of char values
826         * @return The resulting string
827         * @see String#replace(CharSequence, CharSequence)
828         */
829        public static String replace(String s, String target, String replacement) { // NO_UCD (unused code)
830            return s == null ? null : s.replace(target, replacement);
831        }
832
833        /**
834         * Percent-encode a string. (See https://en.wikipedia.org/wiki/Percent-encoding)
835         * This is especially useful for data urls, e.g.
836         * <code>concat("data:image/svg+xml,", URL_encode("&lt;svg&gt;...&lt;/svg&gt;"));</code>
837         * @param s arbitrary string
838         * @return the encoded string
839         */
840        public static String URL_encode(String s) { // NO_UCD (unused code)
841            return s == null ? null : Utils.encodeUrl(s);
842        }
843
844        /**
845         * XML-encode a string.
846         *
847         * Escapes special characters in xml. Alternative to using &lt;![CDATA[ ... ]]&gt; blocks.
848         * @param s arbitrary string
849         * @return the encoded string
850         */
851        public static String XML_encode(String s) { // NO_UCD (unused code)
852            return s == null ? null : XmlWriter.encode(s);
853        }
854
855        /**
856         * Calculates the CRC32 checksum from a string (based on RFC 1952).
857         * @param s the string
858         * @return long value from 0 to 2^32-1
859         */
860        public static long CRC32_checksum(String s) { // NO_UCD (unused code)
861            CRC32 cs = new CRC32();
862            cs.update(s.getBytes(StandardCharsets.UTF_8));
863            return cs.getValue();
864        }
865
866        /**
867         * check if there is right-hand traffic at the current location
868         * @param env the environment
869         * @return true if there is right-hand traffic
870         * @since 7193
871         */
872        public static boolean is_right_hand_traffic(Environment env) {
873            return RightAndLefthandTraffic.isRightHandTraffic(center(env));
874        }
875
876        /**
877         * Determines whether the way is {@link Geometry#isClockwise closed and oriented clockwise},
878         * or non-closed and the {@link Geometry#angleIsClockwise 1st, 2nd and last node are in clockwise order}.
879         *
880         * @param env the environment
881         * @return true if the way is closed and oriented clockwise
882         */
883        public static boolean is_clockwise(Environment env) {
884            if (!(env.osm instanceof Way)) {
885                return false;
886            }
887            final Way way = (Way) env.osm;
888            return (way.isClosed() && Geometry.isClockwise(way))
889                || (!way.isClosed() && way.getNodesCount() > 2 && Geometry.angleIsClockwise(way.getNode(0), way.getNode(1), way.lastNode()));
890        }
891
892        /**
893         * Determines whether the way is {@link Geometry#isClockwise closed and oriented anticlockwise},
894         * or non-closed and the {@link Geometry#angleIsClockwise 1st, 2nd and last node are in anticlockwise order}.
895         *
896         * @param env the environment
897         * @return true if the way is closed and oriented clockwise
898         */
899        public static boolean is_anticlockwise(Environment env) {
900            if (!(env.osm instanceof Way)) {
901                return false;
902            }
903            final Way way = (Way) env.osm;
904            return (way.isClosed() && !Geometry.isClockwise(way))
905                || (!way.isClosed() && way.getNodesCount() > 2 && !Geometry.angleIsClockwise(way.getNode(0), way.getNode(1), way.lastNode()));
906        }
907
908        /**
909         * Prints the object to the command line (for debugging purpose).
910         * @param o the object
911         * @return the same object, unchanged
912         */
913        @NullableArguments
914        public static Object print(Object o) { // NO_UCD (unused code)
915            System.out.print(o == null ? "none" : o.toString());
916            return o;
917        }
918
919        /**
920         * Prints the object to the command line, with new line at the end
921         * (for debugging purpose).
922         * @param o the object
923         * @return the same object, unchanged
924         */
925        @NullableArguments
926        public static Object println(Object o) { // NO_UCD (unused code)
927            System.out.println(o == null ? "none" : o.toString());
928            return o;
929        }
930
931        /**
932         * Get the number of tags for the current primitive.
933         * @param env the environment
934         * @return number of tags
935         */
936        public static int number_of_tags(Environment env) { // NO_UCD (unused code)
937            return env.osm.getNumKeys();
938        }
939
940        /**
941         * Get value of a setting.
942         * @param env the environment
943         * @param key setting key (given as layer identifier, e.g. setting::mykey {...})
944         * @return the value of the setting (calculated when the style is loaded)
945         */
946        public static Object setting(Environment env, String key) { // NO_UCD (unused code)
947            return env.source.settingValues.get(key);
948        }
949
950        /**
951         * Returns the center of the environment OSM primitive.
952         * @param env the environment
953         * @return the center of the environment OSM primitive
954         * @since 11247
955         */
956        public static LatLon center(Environment env) { // NO_UCD (unused code)
957            return env.osm instanceof Node ? ((Node) env.osm).getCoor() : env.osm.getBBox().getCenter();
958        }
959
960        /**
961         * Determines if the object is inside territories matching given ISO3166 codes.
962         * @param env the environment
963         * @param codes comma-separated list of ISO3166-1-alpha2 or ISO3166-2 country/subdivision codes
964         * @return {@code true} if the object is inside territory matching given ISO3166 codes
965         * @since 11247
966         */
967        public static boolean inside(Environment env, String codes) { // NO_UCD (unused code)
968            for (String code : codes.toUpperCase(Locale.ENGLISH).split(",")) {
969                if (Territories.isIso3166Code(code.trim(), center(env))) {
970                    return true;
971                }
972            }
973            return false;
974        }
975
976        /**
977         * Determines if the object is outside territories matching given ISO3166 codes.
978         * @param env the environment
979         * @param codes comma-separated list of ISO3166-1-alpha2 or ISO3166-2 country/subdivision codes
980         * @return {@code true} if the object is outside territory matching given ISO3166 codes
981         * @since 11247
982         */
983        public static boolean outside(Environment env, String codes) { // NO_UCD (unused code)
984            return !inside(env, codes);
985        }
986    }
987
988    /**
989     * Main method to create an function-like expression.
990     *
991     * @param name the name of the function or operator
992     * @param args the list of arguments (as expressions)
993     * @return the generated Expression. If no suitable function can be found,
994     * returns {@link NullExpression#INSTANCE}.
995     */
996    public static Expression createFunctionExpression(String name, List<Expression> args) {
997        if ("cond".equals(name) && args.size() == 3)
998            return new CondOperator(args.get(0), args.get(1), args.get(2));
999        else if ("and".equals(name))
1000            return new AndOperator(args);
1001        else if ("or".equals(name))
1002            return new OrOperator(args);
1003        else if ("length".equals(name) && args.size() == 1)
1004            return new LengthFunction(args.get(0));
1005        else if ("max".equals(name) && !args.isEmpty())
1006            return new MinMaxFunction(args, true);
1007        else if ("min".equals(name) && !args.isEmpty())
1008            return new MinMaxFunction(args, false);
1009
1010        for (Method m : arrayFunctions) {
1011            if (m.getName().equals(name))
1012                return new ArrayFunction(m, args);
1013        }
1014        for (Method m : parameterFunctions) {
1015            if (m.getName().equals(name) && args.size() == m.getParameterTypes().length)
1016                return new ParameterFunction(m, args, false);
1017        }
1018        for (Method m : parameterFunctionsEnv) {
1019            if (m.getName().equals(name) && args.size() == m.getParameterTypes().length-1)
1020                return new ParameterFunction(m, args, true);
1021        }
1022        return NullExpression.INSTANCE;
1023    }
1024
1025    /**
1026     * Expression that always evaluates to null.
1027     */
1028    public static class NullExpression implements Expression {
1029
1030        /**
1031         * The unique instance.
1032         */
1033        public static final NullExpression INSTANCE = new NullExpression();
1034
1035        @Override
1036        public Object evaluate(Environment env) {
1037            return null;
1038        }
1039    }
1040
1041    /**
1042     * Conditional operator.
1043     */
1044    public static class CondOperator implements Expression {
1045
1046        private final Expression condition, firstOption, secondOption;
1047
1048        /**
1049         * Constructs a new {@code CondOperator}.
1050         * @param condition condition
1051         * @param firstOption first option
1052         * @param secondOption second option
1053         */
1054        public CondOperator(Expression condition, Expression firstOption, Expression secondOption) {
1055            this.condition = condition;
1056            this.firstOption = firstOption;
1057            this.secondOption = secondOption;
1058        }
1059
1060        @Override
1061        public Object evaluate(Environment env) {
1062            Boolean b = Cascade.convertTo(condition.evaluate(env), boolean.class);
1063            if (b != null && b)
1064                return firstOption.evaluate(env);
1065            else
1066                return secondOption.evaluate(env);
1067        }
1068    }
1069
1070    /**
1071     * "And" logical operator.
1072     */
1073    public static class AndOperator implements Expression {
1074
1075        private final List<Expression> args;
1076
1077        /**
1078         * Constructs a new {@code AndOperator}.
1079         * @param args arguments
1080         */
1081        public AndOperator(List<Expression> args) {
1082            this.args = args;
1083        }
1084
1085        @Override
1086        public Object evaluate(Environment env) {
1087            for (Expression arg : args) {
1088                Boolean b = Cascade.convertTo(arg.evaluate(env), boolean.class);
1089                if (b == null || !b) {
1090                    return Boolean.FALSE;
1091                }
1092            }
1093            return Boolean.TRUE;
1094        }
1095    }
1096
1097    /**
1098     * "Or" logical operator.
1099     */
1100    public static class OrOperator implements Expression {
1101
1102        private final List<Expression> args;
1103
1104        /**
1105         * Constructs a new {@code OrOperator}.
1106         * @param args arguments
1107         */
1108        public OrOperator(List<Expression> args) {
1109            this.args = args;
1110        }
1111
1112        @Override
1113        public Object evaluate(Environment env) {
1114            for (Expression arg : args) {
1115                Boolean b = Cascade.convertTo(arg.evaluate(env), boolean.class);
1116                if (b != null && b) {
1117                    return Boolean.TRUE;
1118                }
1119            }
1120            return Boolean.FALSE;
1121        }
1122    }
1123
1124    /**
1125     * Function to calculate the length of a string or list in a MapCSS eval expression.
1126     *
1127     * Separate implementation to support overloading for different argument types.
1128     *
1129     * The use for calculating the length of a list is deprecated, use
1130     * {@link Functions#count(java.util.List)} instead (see #10061).
1131     */
1132    public static class LengthFunction implements Expression {
1133
1134        private final Expression arg;
1135
1136        /**
1137         * Constructs a new {@code LengthFunction}.
1138         * @param args arguments
1139         */
1140        public LengthFunction(Expression args) {
1141            this.arg = args;
1142        }
1143
1144        @Override
1145        public Object evaluate(Environment env) {
1146            List<?> l = Cascade.convertTo(arg.evaluate(env), List.class);
1147            if (l != null)
1148                return l.size();
1149            String s = Cascade.convertTo(arg.evaluate(env), String.class);
1150            if (s != null)
1151                return s.length();
1152            return null;
1153        }
1154    }
1155
1156    /**
1157     * Computes the maximum/minimum value an arbitrary number of floats, or a list of floats.
1158     */
1159    public static class MinMaxFunction implements Expression {
1160
1161        private final List<Expression> args;
1162        private final boolean computeMax;
1163
1164        /**
1165         * Constructs a new {@code MinMaxFunction}.
1166         * @param args arguments
1167         * @param computeMax if {@code true}, compute max. If {@code false}, compute min
1168         */
1169        public MinMaxFunction(final List<Expression> args, final boolean computeMax) {
1170            this.args = args;
1171            this.computeMax = computeMax;
1172        }
1173
1174        public Float aggregateList(List<?> lst) {
1175            final List<Float> floats = Utils.transform(lst, (Function<Object, Float>) x -> Cascade.convertTo(x, float.class));
1176            final Collection<Float> nonNullList = SubclassFilteredCollection.filter(floats, Objects::nonNull);
1177            return nonNullList.isEmpty() ? (Float) Float.NaN : computeMax ? Collections.max(nonNullList) : Collections.min(nonNullList);
1178        }
1179
1180        @Override
1181        public Object evaluate(final Environment env) {
1182            List<?> l = Cascade.convertTo(args.get(0).evaluate(env), List.class);
1183            if (args.size() != 1 || l == null)
1184                l = Utils.transform(args, (Function<Expression, Object>) x -> x.evaluate(env));
1185            return aggregateList(l);
1186        }
1187    }
1188
1189    /**
1190     * Function that takes a certain number of argument with specific type.
1191     *
1192     * Implementation is based on a Method object.
1193     * If any of the arguments evaluate to null, the result will also be null.
1194     */
1195    public static class ParameterFunction implements Expression {
1196
1197        private final Method m;
1198        private final boolean nullable;
1199        private final List<Expression> args;
1200        private final Class<?>[] expectedParameterTypes;
1201        private final boolean needsEnvironment;
1202
1203        /**
1204         * Constructs a new {@code ParameterFunction}.
1205         * @param m method
1206         * @param args arguments
1207         * @param needsEnvironment whether function needs environment
1208         */
1209        public ParameterFunction(Method m, List<Expression> args, boolean needsEnvironment) {
1210            this.m = m;
1211            this.nullable = m.getAnnotation(NullableArguments.class) != null;
1212            this.args = args;
1213            this.expectedParameterTypes = m.getParameterTypes();
1214            this.needsEnvironment = needsEnvironment;
1215        }
1216
1217        @Override
1218        public Object evaluate(Environment env) {
1219            Object[] convertedArgs;
1220
1221            if (needsEnvironment) {
1222                convertedArgs = new Object[args.size()+1];
1223                convertedArgs[0] = env;
1224                for (int i = 1; i < convertedArgs.length; ++i) {
1225                    convertedArgs[i] = Cascade.convertTo(args.get(i-1).evaluate(env), expectedParameterTypes[i]);
1226                    if (convertedArgs[i] == null && !nullable) {
1227                        return null;
1228                    }
1229                }
1230            } else {
1231                convertedArgs = new Object[args.size()];
1232                for (int i = 0; i < convertedArgs.length; ++i) {
1233                    convertedArgs[i] = Cascade.convertTo(args.get(i).evaluate(env), expectedParameterTypes[i]);
1234                    if (convertedArgs[i] == null && !nullable) {
1235                        return null;
1236                    }
1237                }
1238            }
1239            Object result = null;
1240            try {
1241                result = m.invoke(null, convertedArgs);
1242            } catch (IllegalAccessException | IllegalArgumentException ex) {
1243                throw new JosmRuntimeException(ex);
1244            } catch (InvocationTargetException ex) {
1245                Main.error(ex);
1246                return null;
1247            }
1248            return result;
1249        }
1250
1251        @Override
1252        public String toString() {
1253            StringBuilder b = new StringBuilder("ParameterFunction~");
1254            b.append(m.getName()).append('(');
1255            for (int i = 0; i < args.size(); ++i) {
1256                if (i > 0) b.append(',');
1257                b.append(expectedParameterTypes[i]).append(' ').append(args.get(i));
1258            }
1259            b.append(')');
1260            return b.toString();
1261        }
1262    }
1263
1264    /**
1265     * Function that takes an arbitrary number of arguments.
1266     *
1267     * Currently, all array functions are static, so there is no need to
1268     * provide the environment, like it is done in {@link ParameterFunction}.
1269     * If any of the arguments evaluate to null, the result will also be null.
1270     */
1271    public static class ArrayFunction implements Expression {
1272
1273        private final Method m;
1274        private final boolean nullable;
1275        private final List<Expression> args;
1276        private final Class<?>[] expectedParameterTypes;
1277        private final Class<?> arrayComponentType;
1278
1279        /**
1280         * Constructs a new {@code ArrayFunction}.
1281         * @param m method
1282         * @param args arguments
1283         */
1284        public ArrayFunction(Method m, List<Expression> args) {
1285            this.m = m;
1286            this.nullable = m.getAnnotation(NullableArguments.class) != null;
1287            this.args = args;
1288            this.expectedParameterTypes = m.getParameterTypes();
1289            this.arrayComponentType = expectedParameterTypes[0].getComponentType();
1290        }
1291
1292        @Override
1293        public Object evaluate(Environment env) {
1294            Object[] convertedArgs = new Object[expectedParameterTypes.length];
1295            Object arrayArg = Array.newInstance(arrayComponentType, args.size());
1296            for (int i = 0; i < args.size(); ++i) {
1297                Object o = Cascade.convertTo(args.get(i).evaluate(env), arrayComponentType);
1298                if (o == null && !nullable) {
1299                    return null;
1300                }
1301                Array.set(arrayArg, i, o);
1302            }
1303            convertedArgs[0] = arrayArg;
1304
1305            Object result = null;
1306            try {
1307                result = m.invoke(null, convertedArgs);
1308            } catch (IllegalAccessException | IllegalArgumentException ex) {
1309                throw new JosmRuntimeException(ex);
1310            } catch (InvocationTargetException ex) {
1311                Main.error(ex);
1312                return null;
1313            }
1314            return result;
1315        }
1316
1317        @Override
1318        public String toString() {
1319            StringBuilder b = new StringBuilder("ArrayFunction~");
1320            b.append(m.getName()).append('(');
1321            for (int i = 0; i < args.size(); ++i) {
1322                if (i > 0) b.append(',');
1323                b.append(arrayComponentType).append(' ').append(args.get(i));
1324            }
1325            b.append(')');
1326            return b.toString();
1327        }
1328    }
1329}