com.google.template.soy.types.parse.ParseErrors.java Source code

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Here is the source code for com.google.template.soy.types.parse.ParseErrors.java

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/*
 * Copyright 2015 Google Inc.
 *
 * 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 com.google.template.soy.types.parse;

import static com.google.template.soy.base.internal.BaseUtils.formatParseExceptionDetails;

import com.google.common.collect.ImmutableSet;

/**
 * Helpers to interpreting parse exceptions
 */
final class ParseErrors {

    /** Pretty prints the parse exception message. */
    static String formatParseException(ParseException e) {
        Token errorToken = e.currentToken;
        if (errorToken.next != null) {
            errorToken = errorToken.next;
        }

        ImmutableSet.Builder<String> expectedTokenImages = ImmutableSet.builder();
        for (int[] expected : e.expectedTokenSequences) {
            // We only display the first token
            expectedTokenImages.add(getTokenDisplayName(expected[0]));
        }
        return formatParseExceptionDetails(errorToken.image, expectedTokenImages.build().asList());
    }

    /**
     * Returns a human friendly display name for tokens.  By default we use the generated token
     * image which is appropriate for literal tokens.
     */
    private static String getTokenDisplayName(int tokenId) {
        switch (tokenId) {
        case TypeParserConstants.IDENT:
            return "identifier";
        case TypeParserConstants.EOF:
            return "eof";
        case TypeParserConstants.UNEXPECTED_TOKEN:
            throw new AssertionError("we should never expect the unexpected token");
        default:
            return TypeParserConstants.tokenImage[tokenId];
        }
    }

}