78 lines
3.7 KiB
Java
78 lines
3.7 KiB
Java
//
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// MIT License
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//
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// Copyright (c) 2020 Alexander Söderberg & Contributors
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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package cloud.commandframework.annotations;
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import org.checkerframework.checker.nullness.qual.NonNull;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.StringTokenizer;
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import java.util.function.Function;
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import java.util.function.Predicate;
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import java.util.regex.Pattern;
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/**
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* Parses command syntax into syntax fragments
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*/
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final class SyntaxParser implements Function<@NonNull String, @NonNull LinkedHashMap<@NonNull String, @NonNull SyntaxFragment>> {
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private static final Predicate<String> PATTERN_ARGUMENT_LITERAL = Pattern.compile("([A-Za-z0-9]+)(|([A-Za-z0-9]+))*")
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.asPredicate();
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private static final Predicate<String> PATTERN_ARGUMENT_REQUIRED = Pattern.compile("<([A-Za-z0-9]+)>")
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.asPredicate();
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private static final Predicate<String> PATTERN_ARGUMENT_OPTIONAL = Pattern.compile("\\[([A-Za-z0-9]+)]")
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.asPredicate();
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@Override
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public @NonNull LinkedHashMap<@NonNull String, @NonNull SyntaxFragment> apply(@NonNull final String syntax) {
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final StringTokenizer stringTokenizer = new StringTokenizer(syntax, " ");
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final LinkedHashMap<String, SyntaxFragment> map = new LinkedHashMap<>();
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while (stringTokenizer.hasMoreTokens()) {
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final String token = stringTokenizer.nextToken();
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String major;
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List<String> minor = new ArrayList<>();
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ArgumentMode mode;
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if (PATTERN_ARGUMENT_REQUIRED.test(token)) {
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major = token.substring(1, token.length() - 1);
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mode = ArgumentMode.REQUIRED;
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} else if (PATTERN_ARGUMENT_OPTIONAL.test(token)) {
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major = token.substring(1, token.length() - 1);
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mode = ArgumentMode.OPTIONAL;
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} else if (PATTERN_ARGUMENT_LITERAL.test(token)) {
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final String[] literals = token.split("\\|");
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/* Actually use the other literals as well */
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major = literals[0];
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minor.addAll(Arrays.asList(literals).subList(1, literals.length));
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mode = ArgumentMode.LITERAL;
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} else {
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throw new IllegalArgumentException(String.format("Unrecognizable syntax token '%s'", syntax));
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}
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map.put(major, new SyntaxFragment(major, minor, mode));
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}
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return map;
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}
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}
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