de.jcup.egradle.core.util.GradleResourceLinkCalculator.java Source code

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Here is the source code for de.jcup.egradle.core.util.GradleResourceLinkCalculator.java

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/*
 * Copyright 2016 Albert Tregnaghi
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 */
package de.jcup.egradle.core.util;

import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.StringUtils;

public class GradleResourceLinkCalculator {

    /**
     * Creates a link result or <code>null</code>
     * 
     * @param line
     * @param offsetInLine
     * @return link result or <code>null</code>
     */
    public GradleHyperLinkResult createResourceLinkString(String line, int offsetInLine) {
        if (line == null) {
            return null;
        }
        if (offsetInLine < 0) {
            return null;
        }
        int lineLength = line.length();
        if (offsetInLine >= lineLength) {
            return null;
        }
        return internalCreateLink(line, offsetInLine);
    }

    private GradleHyperLinkResult internalCreateLink(String line, int offsetInLine) {
        /* e.g. abc defg Test abc */
        /* ^-- Test must be identified */
        String rightSubString = line.substring(offsetInLine);
        StringBuilder content = new StringBuilder();
        for (char c : rightSubString.toCharArray()) {
            if (Character.isWhitespace(c)) {
                break;
            }
            if (c == '{') {
                break;
            }
            if (c == ',') {
                break;
            }
            if (c == '(') {
                break;
            }
            if (c == ')') {
                break;
            }
            if (c == '[') {
                break;
            }
            if (c == '<') {
                break;
            }
            if (c == '>') {
                break;
            }
            if (c == '.') {
                break;
            }
            if (!Character.isJavaIdentifierPart(c)) {
                return null;
            }
            content.append(c);
        }
        if (StringUtils.isBlank(content)) {
            return null;
        }
        String leftSubString = line.substring(0, offsetInLine);
        char[] leftCharsArray = leftSubString.toCharArray();

        ArrayUtils.reverse(leftCharsArray);
        int startPos = offsetInLine;
        for (char c : leftCharsArray) {
            if (c == '(') {
                break;
            }
            if (c == '<') {
                break;
            }
            if (c == '.') {
                break;
            }
            if (Character.isWhitespace(c)) {
                break;
            }
            if (!Character.isJavaIdentifierPart(c)) {
                return null;
            }
            startPos--;
            content.insert(0, c);
        }
        String linkContent = content.toString();

        char firstChar = linkContent.charAt(0);
        if (!Character.isJavaIdentifierStart(firstChar)) {
            return null;
        }
        /*
         * currently this calculator only supports correct Type syntax means
         * first char MUST be upper cased
         */
        if (!Character.isUpperCase(firstChar)) {
            return null;
        }
        GradleHyperLinkResult result = new GradleHyperLinkResult();
        result.linkOffsetInLine = startPos;
        result.linkContent = linkContent;
        result.linkLength = linkContent.length();
        return result;
    }

}