// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.gui.mappaint.mapcss;
import java.awt.Color;
import java.io.UnsupportedEncodingException;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.zip.CRC32;
import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.actions.search.SearchCompiler;
import org.openstreetmap.josm.actions.search.SearchCompiler.Match;
import org.openstreetmap.josm.actions.search.SearchCompiler.ParseError;
import org.openstreetmap.josm.data.osm.Node;
import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.gui.mappaint.Cascade;
import org.openstreetmap.josm.gui.mappaint.Environment;
import org.openstreetmap.josm.io.XmlWriter;
import org.openstreetmap.josm.tools.ColorHelper;
import org.openstreetmap.josm.tools.Predicates;
import org.openstreetmap.josm.tools.RightAndLefthandTraffic;
import org.openstreetmap.josm.tools.Utils;
/**
* Factory to generate Expressions.
*
* See {@link #createFunctionExpression}.
*/
public final class ExpressionFactory {
/**
* Marks functions which should be executed also when one or more arguments are null.
*/
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
static @interface NullableArguments {}
private static final List<Method> arrayFunctions = new ArrayList<>();
private static final List<Method> parameterFunctions = new ArrayList<>();
private static final List<Method> parameterFunctionsEnv = new ArrayList<>();
static {
for (Method m : Functions.class.getDeclaredMethods()) {
Class<?>[] paramTypes = m.getParameterTypes();
if (paramTypes.length == 1 && paramTypes[0].isArray()) {
arrayFunctions.add(m);
} else if (paramTypes.length >= 1 && paramTypes[0].equals(Environment.class)) {
parameterFunctionsEnv.add(m);
} else {
parameterFunctions.add(m);
}
}
try {
parameterFunctions.add(Math.class.getMethod("abs", float.class));
parameterFunctions.add(Math.class.getMethod("acos", double.class));
parameterFunctions.add(Math.class.getMethod("asin", double.class));
parameterFunctions.add(Math.class.getMethod("atan", double.class));
parameterFunctions.add(Math.class.getMethod("atan2", double.class, double.class));
parameterFunctions.add(Math.class.getMethod("ceil", double.class));
parameterFunctions.add(Math.class.getMethod("cos", double.class));
parameterFunctions.add(Math.class.getMethod("cosh", double.class));
parameterFunctions.add(Math.class.getMethod("exp", double.class));
parameterFunctions.add(Math.class.getMethod("floor", double.class));
parameterFunctions.add(Math.class.getMethod("log", double.class));
parameterFunctions.add(Math.class.getMethod("max", float.class, float.class));
parameterFunctions.add(Math.class.getMethod("min", float.class, float.class));
parameterFunctions.add(Math.class.getMethod("random"));
parameterFunctions.add(Math.class.getMethod("round", float.class));
parameterFunctions.add(Math.class.getMethod("signum", double.class));
parameterFunctions.add(Math.class.getMethod("sin", double.class));
parameterFunctions.add(Math.class.getMethod("sinh", double.class));
parameterFunctions.add(Math.class.getMethod("sqrt", double.class));
parameterFunctions.add(Math.class.getMethod("tan", double.class));
parameterFunctions.add(Math.class.getMethod("tanh", double.class));
} catch (NoSuchMethodException | SecurityException ex) {
throw new RuntimeException(ex);
}
}
private ExpressionFactory() {
// Hide default constructor for utils classes
}
/**
* List of functions that can be used in MapCSS expressions.
*
* First parameter can be of type {@link Environment} (if needed). This is
* automatically filled in by JOSM and the user only sees the remaining
* arguments.
* When one of the user supplied arguments cannot be converted the
* expected type or is null, the function is not called and it returns null
* immediately. Add the annotation {@link NullableArguments} to allow
* null arguments.
* Every method must be static.
*/
@SuppressWarnings("UnusedDeclaration")
public static class Functions {
/**
* Identity function for compatibility with MapCSS specification.
* @param o any object
* @return {@code o} unchanged
*/
public static Object eval(Object o) {
return o;
}
public static float plus(float... args) {
float res = 0;
for (float f : args) {
res += f;
}
return res;
}
public static Float minus(float... args) {
if (args.length == 0) {
return 0.0F;
}
if (args.length == 1) {
return -args[0];
}
float res = args[0];
for (int i = 1; i < args.length; ++i) {
res -= args[i];
}
return res;
}
public static float times(float... args) {
float res = 1;
for (float f : args) {
res *= f;
}
return res;
}
public static Float divided_by(float... args) {
if (args.length == 0) {
return 1.0F;
}
float res = args[0];
for (int i = 1; i < args.length; ++i) {
if (args[i] == 0.0F) {
return null;
}
res /= args[i];
}
return res;
}
/**
* Creates a list of values, e.g., for the {@code dashes} property.
* @see Arrays#asList(Object[])
*/
public static List<Object> list(Object... args) {
return Arrays.asList(args);
}
/**
* Returns the number of elements in a list.
* @param lst the list
* @return length of the list
*/
public static Integer count(List<?> lst) {
return lst.size();
}
/**
* Returns the first non-null object. The name originates from the {@code COALESCE} SQL function.
* @deprecated Deprecated in favour of {@link #any(Object...)} from the MapCSS standard.
*/
@NullableArguments
@Deprecated
public static Object coalesce(Object... args) {
return any(args);
}
/**
* Returns the first non-null object.
* The name originates from <a href="http://wiki.openstreetmap.org/wiki/MapCSS/0.2/eval">MapCSS standard</a>.
* @see #coalesce(Object...)
* @see Utils#firstNonNull(Object[])
*/
@NullableArguments
public static Object any(Object... args) {
return Utils.firstNonNull(args);
}
/**
* Get the {@code n}th element of the list {@code lst} (counting starts at 0).
* @since 5699
*/
public static Object get(List<?> lst, float n) {
int idx = Math.round(n);
if (idx >= 0 && idx < lst.size()) {
return lst.get(idx);
}
return null;
}
/**
* Splits string {@code toSplit} at occurrences of the separator string {@code sep} and returns a list of matches.
* @see String#split(String)
* @since 5699
*/
public static List<String> split(String sep, String toSplit) {
return Arrays.asList(toSplit.split(Pattern.quote(sep), -1));
}
/**
* 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)
* @see Color#Color(float, float, float)
*/
public static Color rgb(float r, float g, float b) {
try {
return new Color(r, g, b);
} catch (IllegalArgumentException e) {
return null;
}
}
public static Color rgba(float r, float g, float b, float alpha) {
try {
return new Color(r, g, b, alpha);
} catch (IllegalArgumentException e) {
return null;
}
}
/**
* Create color from hsb color model. (arguments form 0.0 to 1.0)
* @param h hue
* @param s saturation
* @param b brightness
* @return the corresponding color
*/
public static Color hsb_color(float h, float s, float b) {
try {
return Color.getHSBColor(h, s, b);
} catch (IllegalArgumentException e) {
return null;
}
}
/**
* Creates a color value from an HTML notation, i.e., {@code #rrggbb}.
*/
public static Color html2color(String html) {
return ColorHelper.html2color(html);
}
/**
* Computes the HTML notation ({@code #rrggbb}) for a color value).
*/
public static String color2html(Color c) {
return ColorHelper.color2html(c);
}
/**
* Get the value of the red color channel in the rgb color model
* @return the red color channel in the range [0;1]
* @see java.awt.Color#getRed()
*/
public static float red(Color c) {
return Utils.color_int2float(c.getRed());
}
/**
* Get the value of the green color channel in the rgb color model
* @return the green color channel in the range [0;1]
* @see java.awt.Color#getGreen()
*/
public static float green(Color c) {
return Utils.color_int2float(c.getGreen());
}
/**
* Get the value of the blue color channel in the rgb color model
* @return the blue color channel in the range [0;1]
* @see java.awt.Color#getBlue()
*/
public static float blue(Color c) {
return Utils.color_int2float(c.getBlue());
}
/**
* Get the value of the alpha channel in the rgba color model
* @return the alpha channel in the range [0;1]
* @see java.awt.Color#getAlpha()
*/
public static float alpha(Color c) {
return Utils.color_int2float(c.getAlpha());
}
/**
* Assembles the strings to one.
* @see Utils#join
*/
@NullableArguments
public static String concat(Object... args) {
return Utils.join("", Arrays.asList(args));
}
/**
* Assembles the strings to one, where the first entry is used as separator.
* @see Utils#join
*/
@NullableArguments
public static String join(String... args) {
return Utils.join(args[0], Arrays.asList(args).subList(1, args.length));
}
/**
* Returns the value of the property {@code key}, e.g., {@code prop("width")}.
*/
public static Object prop(final Environment env, String key) {
return prop(env, key, null);
}
/**
* Returns the value of the property {@code key} from layer {@code layer}.
*/
public static Object prop(final Environment env, String key, String layer) {
return env.getCascade(layer).get(key);
}
/**
* Determines whether property {@code key} is set.
*/
public static Boolean is_prop_set(final Environment env, String key) {
return is_prop_set(env, key, null);
}
/**
* Determines whether property {@code key} is set on layer {@code layer}.
*/
public static Boolean is_prop_set(final Environment env, String key, String layer) {
return env.getCascade(layer).containsKey(key);
}
/**
* Gets the value of the key {@code key} from the object in question.
*/
public static String tag(final Environment env, String key) {
return env.osm == null ? null : env.osm.get(key);
}
/**
* Gets the first non-null value of the key {@code key} from the object's parent(s).
*/
public static String parent_tag(final Environment env, String key) {
if (env.parent == null) {
if (env.osm != null) {
// we don't have a matched parent, so just search all referrers
for (OsmPrimitive parent : env.osm.getReferrers()) {
String value = parent.get(key);
if (value != null) {
return value;
}
}
}
return null;
}
return env.parent.get(key);
}
public static String child_tag(final Environment env, String key) {
return env.child == null ? null : env.child.get(key);
}
/**
* Determines whether the object has a tag with the given key.
*/
public static boolean has_tag_key(final Environment env, String key) {
return env.osm.hasKey(key);
}
/**
* Returns the index of node in parent way or member in parent relation.
*/
public static Float index(final Environment env) {
if (env.index == null) {
return null;
}
return new Float(env.index + 1);
}
public static String role(final Environment env) {
return env.getRole();
}
public static boolean not(boolean b) {
return !b;
}
public static boolean greater_equal(float a, float b) {
return a >= b;
}
public static boolean less_equal(float a, float b) {
return a <= b;
}
public static boolean greater(float a, float b) {
return a > b;
}
public static boolean less(float a, float b) {
return a < b;
}
/**
* Determines if the objects {@code a} and {@code b} are equal.
* @see Object#equals(Object)
*/
public static boolean equal(Object a, Object b) {
if (a.getClass() == b.getClass()) return a.equals(b);
if (a.equals(Cascade.convertTo(b, a.getClass()))) return true;
return b.equals(Cascade.convertTo(a, b.getClass()));
}
/**
* Determines whether the JOSM search with {@code searchStr} applies to the object.
*/
public static Boolean JOSM_search(final Environment env, String searchStr) {
Match m;
try {
m = SearchCompiler.compile(searchStr, false, false);
} catch (ParseError ex) {
return null;
}
return m.match(env.osm);
}
/**
* Obtains the JOSM'key {@link org.openstreetmap.josm.data.Preferences} string for key {@code key},
* and defaults to {@code def} if that is null.
* @see org.openstreetmap.josm.data.Preferences#get(String, String)
*/
public static String JOSM_pref(String key, String def) {
String res = Main.pref.get(key, null);
return res != null ? res : def;
}
/**
* Tests if string {@code target} matches pattern {@code pattern}
* @see Pattern#matches(String, CharSequence)
* @since 5699
*/
public static boolean regexp_test(String pattern, String target) {
return Pattern.matches(pattern, target);
}
/**
* Tests if string {@code target} matches pattern {@code pattern}
* @param flags a string that may contain "i" (case insensitive), "m" (multiline) and "s" ("dot all")
* @since 5699
*/
public static boolean regexp_test(String pattern, String target, String flags) {
int f = 0;
if (flags.contains("i")) {
f |= Pattern.CASE_INSENSITIVE;
}
if (flags.contains("s")) {
f |= Pattern.DOTALL;
}
if (flags.contains("m")) {
f |= Pattern.MULTILINE;
}
return Pattern.compile(pattern, f).matcher(target).matches();
}
/**
* Tries to match string against pattern regexp and returns a list of capture groups in case of success.
* The first element (index 0) is the complete match (i.e. string).
* Further elements correspond to the bracketed parts of the regular expression.
* @param flags a string that may contain "i" (case insensitive), "m" (multiline) and "s" ("dot all")
* @since 5701
*/
public static List<String> regexp_match(String pattern, String target, String flags) {
int f = 0;
if (flags.contains("i")) {
f |= Pattern.CASE_INSENSITIVE;
}
if (flags.contains("s")) {
f |= Pattern.DOTALL;
}
if (flags.contains("m")) {
f |= Pattern.MULTILINE;
}
Matcher m = Pattern.compile(pattern, f).matcher(target);
return Utils.getMatches(m);
}
/**
* Tries to match string against pattern regexp and returns a list of capture groups in case of success.
* The first element (index 0) is the complete match (i.e. string).
* Further elements correspond to the bracketed parts of the regular expression.
* @since 5701
*/
public static List<String> regexp_match(String pattern, String target) {
Matcher m = Pattern.compile(pattern).matcher(target);
return Utils.getMatches(m);
}
/**
* Returns the OSM id of the current object.
* @see OsmPrimitive#getUniqueId()
*/
public static long osm_id(final Environment env) {
return env.osm.getUniqueId();
}
/**
* Translates some text for the current locale. The first argument is the text to translate,
* and the subsequent arguments are parameters for the string indicated by {@code {0}}, {@code {1}}, …
*/
@NullableArguments
public static String tr(String... args) {
final String text = args[0];
System.arraycopy(args, 1, args, 0, args.length - 1);
return org.openstreetmap.josm.tools.I18n.tr(text, (Object[])args);
}
/**
* Returns the substring of {@code s} starting at index {@code begin} (inclusive, 0-indexed).
* @param s The base string
* @param begin The start index
* @return the substring
* @see String#substring(int)
*/
public static String substring(String s, /* due to missing Cascade.convertTo for int*/ float begin) {
return s == null ? null : s.substring((int) begin);
}
/**
* Returns the substring of {@code s} starting at index {@code begin} (inclusive)
* and ending at index {@code end}, (exclusive, 0-indexed).
* @param s The base string
* @param begin The start index
* @param end The end index
* @return the substring
* @see String#substring(int, int)
*/
public static String substring(String s, float begin, float end) {
return s == null ? null : s.substring((int) begin, (int) end);
}
/**
* Replaces in {@code s} every {@code} target} substring by {@code replacement}.
* * @see String#replace(CharSequence, CharSequence)
*/
public static String replace(String s, String target, String replacement) {
return s == null ? null : s.replace(target, replacement);
}
/**
* Percent-encode a string. (See https://en.wikipedia.org/wiki/Percent-encoding)
* This is especially useful for data urls, e.g.
* <code>icon-image: concat("data:image/svg+xml,", URL_encode("<svg>...</svg>"));</code>
* @param s arbitrary string
* @return the encoded string
*/
public static String URL_encode(String s) {
try {
return s == null ? null : URLEncoder.encode(s, "UTF-8");
} catch (UnsupportedEncodingException ex) {
throw new RuntimeException(ex);
}
}
/**
* XML-encode a string.
*
* Escapes special characters in xml. Alternative to using <![CDATA[ ... ]]> blocks.
* @param s arbitrary string
* @return the encoded string
*/
public static String XML_encode(String s) {
return s == null ? null : XmlWriter.encode(s);
}
/**
* Calculates the CRC32 checksum from a string (based on RFC 1952).
* @param s the string
* @return long value from 0 to 2^32-1
*/
public static long CRC32_checksum(String s) {
CRC32 cs = new CRC32();
cs.update(s.getBytes(StandardCharsets.UTF_8));
return cs.getValue();
}
/**
* check if there is right-hand traffic at the current location
* @param env the environment
* @return true if there is right-hand traffic
* @since 7193
*/
public static boolean is_right_hand_traffic(Environment env) {
if (env.osm instanceof Node)
return RightAndLefthandTraffic.isRightHandTraffic(((Node) env.osm).getCoor());
return RightAndLefthandTraffic.isRightHandTraffic(env.osm.getBBox().getCenter());
}
/**
* Prints the object to the command line (for debugging purpose).
* @param o the object
* @return the same object, unchanged
*/
@NullableArguments
public static Object print(Object o) {
System.out.print(o == null ? "none" : o.toString());
return o;
}
/**
* Prints the object to the command line, with new line at the end
* (for debugging purpose).
* @param o the object
* @return the same object, unchanged
*/
@NullableArguments
public static Object println(Object o) {
System.out.println(o == null ? "none" : o.toString());
return o;
}
/**
* Get the number of tags for the current primitive.
* @param env
* @return number of tags
*/
public static int number_of_tags(Environment env) {
return env.osm.getNumKeys();
}
}
/**
* Main method to create an function-like expression.
*
* @param name the name of the function or operator
* @param args the list of arguments (as expressions)
* @return the generated Expression. If no suitable function can be found,
* returns {@link NullExpression#INSTANCE}.
*/
public static Expression createFunctionExpression(String name, List<Expression> args) {
if ("cond".equals(name) && args.size() == 3)
return new CondOperator(args.get(0), args.get(1), args.get(2));
else if ("and".equals(name))
return new AndOperator(args);
else if ("or".equals(name))
return new OrOperator(args);
else if ("length".equals(name) && args.size() == 1)
return new LengthFunction(args.get(0));
else if ("max".equals(name) && !args.isEmpty())
return new MinMaxFunction(args, true);
else if ("min".equals(name) && !args.isEmpty())
return new MinMaxFunction(args, false);
for (Method m : arrayFunctions) {
if (m.getName().equals(name))
return new ArrayFunction(m, args);
}
for (Method m : parameterFunctions) {
if (m.getName().equals(name) && args.size() == m.getParameterTypes().length)
return new ParameterFunction(m, args, false);
}
for (Method m : parameterFunctionsEnv) {
if (m.getName().equals(name) && args.size() == m.getParameterTypes().length-1)
return new ParameterFunction(m, args, true);
}
return NullExpression.INSTANCE;
}
/**
* Expression that always evaluates to null.
*/
public static class NullExpression implements Expression {
/**
* The unique instance.
*/
public static final NullExpression INSTANCE = new NullExpression();
@Override
public Object evaluate(Environment env) {
return null;
}
}
/**
* Conditional operator.
*/
public static class CondOperator implements Expression {
private Expression condition, firstOption, secondOption;
public CondOperator(Expression condition, Expression firstOption, Expression secondOption) {
this.condition = condition;
this.firstOption = firstOption;
this.secondOption = secondOption;
}
@Override
public Object evaluate(Environment env) {
Boolean b = Cascade.convertTo(condition.evaluate(env), boolean.class);
if (b != null && b)
return firstOption.evaluate(env);
else
return secondOption.evaluate(env);
}
}
public static class AndOperator implements Expression {
private List<Expression> args;
public AndOperator(List<Expression> args) {
this.args = args;
}
@Override
public Object evaluate(Environment env) {
for (Expression arg : args) {
Boolean b = Cascade.convertTo(arg.evaluate(env), boolean.class);
if (b == null || !b) {
return false;
}
}
return true;
}
}
public static class OrOperator implements Expression {
private List<Expression> args;
public OrOperator(List<Expression> args) {
this.args = args;
}
@Override
public Object evaluate(Environment env) {
for (Expression arg : args) {
Boolean b = Cascade.convertTo(arg.evaluate(env), boolean.class);
if (b != null && b) {
return true;
}
}
return false;
}
}
/**
* Function to calculate the length of a string or list in a MapCSS eval
* expression.
*
* Separate implementation to support overloading for different
* argument types.
*
* The use for calculating the length of a list is deprecated, use
* {@link Functions#count(java.util.List)} instead (see #10061).
*/
public static class LengthFunction implements Expression {
private Expression arg;
public LengthFunction(Expression args) {
this.arg = args;
}
@Override
public Object evaluate(Environment env) {
List<?> l = Cascade.convertTo(arg.evaluate(env), List.class);
if (l != null)
return l.size();
String s = Cascade.convertTo(arg.evaluate(env), String.class);
if (s != null)
return s.length();
return null;
}
}
/**
* Computes the maximum/minimum value an arbitrary number of floats, or a list of floats.
*/
public static class MinMaxFunction implements Expression {
private final List<Expression> args;
private final boolean computeMax;
public MinMaxFunction(final List<Expression> args, final boolean computeMax) {
this.args = args;
this.computeMax = computeMax;
}
public Float aggregateList(List<?> lst) {
final List<Float> floats = Utils.transform(lst, new Utils.Function<Object, Float>() {
@Override
public Float apply(Object x) {
return Cascade.convertTo(x, float.class);
}
});
final Collection<Float> nonNullList = Utils.filter(floats, Predicates.not(Predicates.isNull()));
return computeMax ? Collections.max(nonNullList) : Collections.min(nonNullList);
}
@Override
public Object evaluate(final Environment env) {
List<?> l = Cascade.convertTo(args.get(0).evaluate(env), List.class);
if (args.size() != 1 || l == null)
l = Utils.transform(args, new Utils.Function<Expression, Object>() {
@Override
public Object apply(Expression x) {
return x.evaluate(env);
}
});
return aggregateList(l);
}
}
/**
* Function that takes a certain number of argument with specific type.
*
* Implementation is based on a Method object.
* If any of the arguments evaluate to null, the result will also be null.
*/
public static class ParameterFunction implements Expression {
private final Method m;
private final boolean nullable;
private final List<Expression> args;
private final Class<?>[] expectedParameterTypes;
private final boolean needsEnvironment;
public ParameterFunction(Method m, List<Expression> args, boolean needsEnvironment) {
this.m = m;
this.nullable = m.getAnnotation(NullableArguments.class) != null;
this.args = args;
this.expectedParameterTypes = m.getParameterTypes();
this.needsEnvironment = needsEnvironment;
}
@Override
public Object evaluate(Environment env) {
Object[] convertedArgs;
if (needsEnvironment) {
convertedArgs = new Object[args.size()+1];
convertedArgs[0] = env;
for (int i = 1; i < convertedArgs.length; ++i) {
convertedArgs[i] = Cascade.convertTo(args.get(i-1).evaluate(env), expectedParameterTypes[i]);
if (convertedArgs[i] == null && !nullable) {
return null;
}
}
} else {
convertedArgs = new Object[args.size()];
for (int i = 0; i < convertedArgs.length; ++i) {
convertedArgs[i] = Cascade.convertTo(args.get(i).evaluate(env), expectedParameterTypes[i]);
if (convertedArgs[i] == null && !nullable) {
return null;
}
}
}
Object result = null;
try {
result = m.invoke(null, convertedArgs);
} catch (IllegalAccessException | IllegalArgumentException ex) {
throw new RuntimeException(ex);
} catch (InvocationTargetException ex) {
Main.error(ex);
return null;
}
return result;
}
@Override
public String toString() {
StringBuilder b = new StringBuilder("ParameterFunction~");
b.append(m.getName()).append("(");
for (int i = 0; i < args.size(); ++i) {
if (i > 0) b.append(",");
b.append(expectedParameterTypes[i]);
b.append(" ").append(args.get(i));
}
b.append(')');
return b.toString();
}
}
/**
* Function that takes an arbitrary number of arguments.
*
* Currently, all array functions are static, so there is no need to
* provide the environment, like it is done in {@link ParameterFunction}.
* If any of the arguments evaluate to null, the result will also be null.
*/
public static class ArrayFunction implements Expression {
private final Method m;
private final boolean nullable;
private final List<Expression> args;
private final Class<?>[] expectedParameterTypes;
private final Class<?> arrayComponentType;
public ArrayFunction(Method m, List<Expression> args) {
this.m = m;
this.nullable = m.getAnnotation(NullableArguments.class) != null;
this.args = args;
this.expectedParameterTypes = m.getParameterTypes();
this.arrayComponentType = expectedParameterTypes[0].getComponentType();
}
@Override
public Object evaluate(Environment env) {
Object[] convertedArgs = new Object[expectedParameterTypes.length];
Object arrayArg = Array.newInstance(arrayComponentType, args.size());
for (int i = 0; i < args.size(); ++i) {
Object o = Cascade.convertTo(args.get(i).evaluate(env), arrayComponentType);
if (o == null && !nullable) {
return null;
}
Array.set(arrayArg, i, o);
}
convertedArgs[0] = arrayArg;
Object result = null;
try {
result = m.invoke(null, convertedArgs);
} catch (IllegalAccessException | IllegalArgumentException ex) {
throw new RuntimeException(ex);
} catch (InvocationTargetException ex) {
Main.error(ex);
return null;
}
return result;
}
@Override
public String toString() {
StringBuilder b = new StringBuilder("ArrayFunction~");
b.append(m.getName()).append("(");
for (int i = 0; i < args.size(); ++i) {
if (i > 0) b.append(",");
b.append(arrayComponentType);
b.append(" ").append(args.get(i));
}
b.append(')');
return b.toString();
}
}
}