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 * The Universal Permissive License (UPL), Version 1.0
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 * person obtaining a copy of this software, associated documentation and/or
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.regex.charset;

import com.oracle.truffle.api.CompilerDirectives;

public class UnicodeProperties {

    public static CodePointSet getProperty(String propertySpec) {
        return evaluatePropertySpec(normalizePropertySpec(propertySpec));
    }

    /**
     * @param propertySpec *Normalized* Unicode character property specification (i.e. only
     *            abbreviated properties and property values)
     */
    private static CodePointSet evaluatePropertySpec(String propertySpec) {
        CodePointSet generalCategory = UnicodeGeneralCategories.getGeneralCategory(propertySpec);
        if (generalCategory != null) {
            return generalCategory;
        }
        return UnicodePropertyData.retrieveProperty(propertySpec);
    }

    private static String normalizePropertySpec(String propertySpec) {
        int equals = propertySpec.indexOf('=');
        if (equals >= 0) {
            String propertyName = normalizePropertyName(propertySpec.substring(0, equals));
            String propertyValue = propertySpec.substring(equals + 1);
            switch (propertyName) {
                case "gc":
                    propertyValue = normalizeGeneralCategoryName(propertyValue);
                    break;
                case "sc":
                case "scx":
                    propertyValue = normalizeScriptName(propertyValue);
                    break;
                default:
                    CompilerDirectives.transferToInterpreterAndInvalidate();
                    throw new IllegalArgumentException(String.format("Binary property %s cannot appear to the left of '=' in a Unicode property escape", propertySpec.substring(0, equals)));
            }
            return propertyName + "=" + propertyValue;
        } else if (isGeneralCategoryName(propertySpec)) {
            return "gc=" + normalizeGeneralCategoryName(propertySpec);
        } else {
            return normalizePropertyName(propertySpec);
        }
    }

    private static boolean isGeneralCategoryName(String generalCategoryName) {
        return UnicodePropertyData.GENERAL_CATEGORY_ALIASES.containsKey(generalCategoryName);
    }

    private static String normalizePropertyName(String propertyName) {
        if (!UnicodePropertyData.PROPERTY_ALIASES.containsKey(propertyName)) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            throw new IllegalArgumentException(String.format("Unsupported Unicode character property '%s'", propertyName));
        }
        return UnicodePropertyData.PROPERTY_ALIASES.get(propertyName);
    }

    private static String normalizeGeneralCategoryName(String generalCategoryName) {
        if (!UnicodePropertyData.GENERAL_CATEGORY_ALIASES.containsKey(generalCategoryName)) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            throw new IllegalArgumentException(String.format("Unknown Unicode character general category '%s'", generalCategoryName));
        }
        return UnicodePropertyData.GENERAL_CATEGORY_ALIASES.get(generalCategoryName);
    }

    private static String normalizeScriptName(String scriptName) {
        if (!UnicodePropertyData.SCRIPT_ALIASES.containsKey(scriptName)) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            throw new IllegalArgumentException(String.format("Unkown Unicode script name '%s'", scriptName));
        }
        return UnicodePropertyData.SCRIPT_ALIASES.get(scriptName);
    }
}