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• ScriptProcessor.java

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net.n2oapp.framework.api.script.ScriptProcessor Maven / Gradle / Ivy

package net.n2oapp.framework.api.script;

import net.n2oapp.criteria.dataset.DataSet;
import net.n2oapp.criteria.dataset.Interval;
import net.n2oapp.framework.api.data.DomainProcessor;
import net.n2oapp.framework.api.exception.N2oException;
import net.n2oapp.framework.api.metadata.global.view.widget.table.N2oSwitch;
import org.apache.commons.io.IOUtils;
import org.mozilla.javascript.EvaluatorException;
import org.mozilla.javascript.Parser;
import org.mozilla.javascript.ast.AstNode;
import org.mozilla.javascript.ast.Name;
import org.mozilla.javascript.ast.NodeVisitor;
import org.mozilla.javascript.ast.PropertyGet;

import javax.script.*;
import java.io.IOException;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.function.Predicate;
import java.util.regex.Pattern;
import java.util.stream.Collectors;

import static net.n2oapp.framework.api.StringUtils.*;

/**
 * Утилитный класс для генерации js скриптов
 */
public class ScriptProcessor {
    private static final ScriptProcessor instance = new ScriptProcessor();
    private static final List momentFuncs = Arrays.asList("moment", "now", "today", "yesterday", "tomorrow",
            "beginWeek", "endWeek", "beginMonth", "endMonth", "beginQuarter", "endQuarter", "beginYear", "endYear");
    private static final String spread_operator = "*.";

    private final static ScriptEngineManager engineMgr = new ScriptEngineManager();
    private static volatile ScriptEngine scriptEngine;
    private static String MOMENT_JS;

    private static Pattern functionPattern = Pattern.compile("function\\s*\\(\\)[\\s\\S]*");

    public static String resolveLinks(String text) {
        if (text == null)
            return null;
        if (hasLink(text)) {
            String expr = text;
            if (expr.contains("${")) {
                while (expr.contains("${")) {
                    int idx = expr.indexOf("}", expr.indexOf("${"));
                    boolean notEnd = idx < expr.length() - 1;
                    expr = expr.replaceFirst("\\$\\{", "\\$<");
                    if (notEnd) {
                        expr = expr.substring(0, idx) + ">>" + expr.substring(idx + 1);
                    } else {
                        expr = expr.substring(0, idx) + ">>";
                    }

                }
            }
            if (expr.contains("#{")) {
                while (expr.contains("#{")) {
                    int idx = expr.indexOf("}", expr.indexOf("#{"));
                    boolean notEnd = idx < expr.length() - 1;
                    expr = expr.replaceFirst("#\\{", "#<");
                    if (notEnd) {
                        expr = expr.substring(0, idx) + ">>" + expr.substring(idx + 1);
                    } else {
                        expr = expr.substring(0, idx) + ">>";
                    }
                }
            }
            if (hasLink(expr)) {
                expr = resolveToJsString(expr);
                return toJsExpression(expr.replaceAll("#<", "#{").replaceAll("\\$<", "\\${").replaceAll(">>", "}"));
            } else {
                return expr.replaceAll("#<", "#{").replaceAll("\\$<", "\\${").replaceAll(">>", "}");
            }
        }
        return text;
    }

    /**
     * Преобразование выражения в самовызывающуюся js функцию.
     * Примеры.
     * "if (gender.id = 1) return 'М'; else return 'Ж';" -> "(function(){if (gender.id = 1) return 'М'; else return 'Ж';})()"
     * "gender.id == 1" -> "gender.id == 1"
     * "function(){if (gender.id = 1) return 'М'; else return 'Ж';}" -> "(function(){if (gender.id = 1) return 'М'; else return 'Ж';})()"
     * "(function(){ return '123'; })()" -> "(function(){ return '123'; })()"
     *
     * @param text выражение сождержащее ссылки
     * @return js функция
     */
    public static String resolveFunction(String text) {
        if (text == null)
            return null;
        String trimmedText = text.trim();
        if (trimmedText.startsWith("(function")) {
            return text;
        }
        if (functionPattern.matcher(trimmedText).matches()) {
            return String.format("(%s).call(this)", trimmedText);
        }
        if (trimmedText.contains("return ")) {
            return String.format("(function(){%s}).call(this)", trimmedText);
        } else {
            return trimmedText;
        }
    }


    /**
     * Преобразование выражений с ссылками в js код.
     * Примеры.
     * {id} -> `id` (String), "1" -> 1 (Integer)
     * "true" -> true (Boolean), "1,2" -> 1,2 (String)
     * "test" -> test (String), "`1+1`" -> `1+1` (String)
     * "Test{id}" -> `'Test'+id` (String)
     * #{test} -> #{test} (String), ${test} -> ${test} (String)
     * {test*.id} -> `.map(fuct...)`
     *
     * @param text выражение, содержащее ссылки
     * @return js код
     */
    public static Object resolveExpression(String text) {
        String expression = resolveLinks(text);
        if (expression == null)
            return null;
        if (expression.equals("true") || expression.equals("false"))
            return Boolean.valueOf(expression);
        if (expression.matches("([\\d]+)")) {
            try {
                return Integer.parseInt(expression);
            } catch (NumberFormatException e) {
            }
        }
        return expression;
    }

    /**
     * Изменить значение JS выражения на обратное
     *
     * @param text JS выражение или текст
     * @return Обратное JS выражение или объект
     */
    public static Object invertExpression(String text) {
        Object result = resolveExpression(text);
        if (result == null)
            return null;
        if (result instanceof Boolean)
            return !(Boolean) result;
        if (!isJs(result))
            return result;
        String expr = (String) result;
        expr = expr.substring(1, expr.length() - 1);
        expr = toJsExpression("!(" + expr + ")");
        return expr;
    }

    /**
     * Преобразование списка expression в js код
     * Примеры
     * "1" -> [1] (List), ("1", "2") -> [1,2] (List)
     * ("Test1", "Test2") -> ["Test1","Test2"] (List)
     * ("true", "false") -> [true,false] (List)
     * ("{id}") -> `[id]` (String), ("{id1}", "{id2}") -> `[id1,id2]` (String)
     * ("Test{id1}", "Test{id2}") -> `['Test'+id1,'Test'+id2]` (String)
     *
     * @param values значения, записанное в xml как список value
     * @return js код
     */
    public static Object resolveArrayExpression(String... values) {
        //todo реализовать варианты с плейсхлодарами(пока реализовано только для констант)
        if (values.length == 0) {
            return null;
        } else {
            List result = new ArrayList();
            for (String value : values) {
                result.add(resolveExpression(value));
            }
            return result;
        }
    }

    private static String toJsExpression(String expression) {
        return "`" + expression + "`";
    }

    public static Object removeJsBraces(Object expression) {
        if (expression instanceof String)
            return ((String) expression).replaceAll("`", "");
        return expression;
    }

    private static String resolveToJsString(String text) {
        if (text == null) return null;
        StringBuilder sb = new StringBuilder();
        String[] split = text.split("\\{");
        if (split.length <= 1)
            return text;
        if (!split[0].equals("")) {
            sb.append("'".concat(split[0]).concat("'"));
        }
        for (int i = 1; i < split.length; i++) {
            int idxSuffix = split[i].indexOf("}");
            if (idxSuffix > 0) {
                String value = split[i].substring(0, idxSuffix);
                if (value.contains(spread_operator)) {
                    value = value.substring(0, value.indexOf(spread_operator)) + ".map(function(t){return t." +
                            value.substring(value.indexOf(spread_operator) + 2) + "})";
                }
                sb.append("+").append(value);
                if (idxSuffix < split[i].length() - 1) {
                    String afterValue = split[i].substring(idxSuffix + 1);
                    sb.append("+'").append(afterValue).append("'");
                }
            }
        }
        String res = sb.toString();
        if (res.startsWith("+")) {
            res = res.replaceFirst("\\+", "");
        }
        if (res.endsWith("+")) {
            res = res.substring(0, res.length() - 1);
        }
        return res;
    }

    public static String createFunctionCall(String funcName, Object... args) {
        StringBuilder res = new StringBuilder();
        res.append(funcName);
        res.append('(');
        boolean begin = true;
        for (Object arg : args) {
            if (!begin) res.append(",");
            //добавляем кавычки для строк
            String str = arg instanceof String ? "'" + arg.toString() + "'" : arg.toString();
            res.append(str);
            begin = false;
        }
        res.append(')');
        return res.toString();
    }

    public static String createSelfInvokingFunction(String code) {
        return "function(){" + code + "}()";
    }

    public static String buildSwitchExpression(N2oSwitch n2oSwitch) {
        if (n2oSwitch == null
                || (n2oSwitch.getCases() == null && n2oSwitch.getResolvedCases() == null && n2oSwitch.getDefaultCase() == null)
                || (n2oSwitch.getValueFieldId() == null || n2oSwitch.getValueFieldId().length() == 0))
            return null;
        Map cases = resolveSwitchCases(n2oSwitch.getResolvedCases() != null ? n2oSwitch.getResolvedCases() : n2oSwitch.getCases());
        StringBuilder b = new StringBuilder("`");
        for (Object key : cases.keySet()) {
            b.append(n2oSwitch.getValueFieldId() + " == " + key + " ? ");
            b.append(cases.get(key) + " : ");
        }
        if (n2oSwitch.getDefaultCase() != null) {
            b.append("'" + ScriptProcessor.resolveExpression(n2oSwitch.getDefaultCase()) + "'");
        } else {
            b.append("null");
        }
        return b.toString() + "`";
    }


    public String buildIsNullExpression(String variable) {
        StringBuilder res = null;
        StringBuilder tmpVar = null;
        for (String s : variable.split("\\.")) {
            if (tmpVar == null)
                tmpVar = new StringBuilder();
            else
                tmpVar.append(".");
            tmpVar.append(s);
            if (res == null)
                res = new StringBuilder();
            else
                res.append(" || ");
            res.append(buildUndefinedExpression(tmpVar.toString()));
        }
        res.append(" || (" + variable + " === null)");
        return res.toString();
    }


    public String buildIsNotNullExpression(String variable) {
        return variable + " != null";
    }


    private String buildUndefinedExpression(String variable) {
        return "(typeof " + variable + " === 'undefined')";
    }

    public String buildEqualExpression(String variable, Object value) {
        return variable + " == " + getString(value);
    }

    public String buildLikeExpression(String variable, String value) {
        String res = "%s.indexOf(%s) !== -1";
        return String.format(res, variable, getString(value));
    }

    public String buildLikeStartExpression(String variable, String value) {
        String res = "%s.indexOf(%s) === 0";
        return String.format(res, variable, getString(value));
    }

    public String buildInListExpression(String variable, List