/* See: README for this file's copyright, terms, and conditions. */
package org.json.simple;

import java.io.IOException;
import java.io.StringReader;
import java.math.BigDecimal;

import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

/** Ensures the lexer hasn't regressed in functionality or breaks its API contract. */
public class YylexTest{
    /** Called before each Test Method. */
    @Before
    public void setUp(){
        /* All of the implemented tests use local variables in their own respective method. */
    }

    /** Called after each Test method. */
    @After
    public void tearDown(){
        /* All of the implemented tests use local variables in their own respective method. */
    }

    /** Ensures a negative number is lexable.
     * @throws IOException if the test fails.
     * @throws DeserializationException if the test fails. */
    @Test
    public void testLexingNegativeNumber() throws IOException, DeserializationException{
        StringReader lexable;
        Yylex lexer;
        Yytoken lexed;
        lexable = new StringReader("-123456789098765432101234567890987654321");
        lexer = new Yylex(lexable);
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.DATUM, lexed.getType());
        Assert.assertEquals(new BigDecimal("-123456789098765432101234567890987654321"), lexed.getValue());
    }

    /** Ensures a number with a decimal place in it is lexable.
     * @throws IOException if the test fails.
     * @throws DeserializationException if the test fails. */
    @Test
    public void testLexingNumberWithDecimal() throws IOException, DeserializationException{
        StringReader lexable;
        Yylex lexer;
        Yytoken lexed;
        lexable = new StringReader("-1234567890987654321.01234567890987654321");
        lexer = new Yylex(lexable);
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.DATUM, lexed.getType());
        Assert.assertEquals(new BigDecimal("-1234567890987654321.01234567890987654321"), lexed.getValue());
    }

    /** Ensures a number with an exponent is lexable.
     * @throws IOException if the test fails.
     * @throws DeserializationException if the test fails. */
    @Test
    public void testLexingNumberWithExponent() throws IOException, DeserializationException{
        StringReader lexable;
        Yylex lexer;
        Yytoken lexed;
        lexable = new StringReader("-1234567890987654321.01234567890987654321E-50");
        lexer = new Yylex(lexable);
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.DATUM, lexed.getType());
        Assert.assertEquals(new BigDecimal("-1234567890987654321.01234567890987654321E-50"), lexed.getValue());
    }

    /** Ensures a positive number is lexable.
     * @throws IOException if the test fails.
     * @throws DeserializationException if the test fails. */
    @Test
    public void testLexingPositiveNumber() throws IOException, DeserializationException{
        StringReader lexable;
        Yylex lexer;
        Yytoken lexed;
        lexable = new StringReader("123456789098765432101234567890987654321");
        lexer = new Yylex(lexable);
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.DATUM, lexed.getType());
        Assert.assertEquals(new BigDecimal("123456789098765432101234567890987654321"), lexed.getValue());
    }

    /** Ensures a String containing escaped characters and various unicode characters is lexable.
     * @throws IOException if the test fails.
     * @throws DeserializationException if the test fails. */
    @Test
    public void testLexingStringContainingEscapedCharacters() throws IOException, DeserializationException{
        StringReader lexable;
        Yylex lexer;
        Yytoken lexed;
        lexable = new StringReader("\"ABCDEFGHIJKLMNOPQRSTUVWXYZ<>:{}abcdefghijklmnopqrstuvwxyz,.;'[]\\/`123456789-=~!@#$%^&*_+()\\r\\b\\n\\t\\f\\\\К௪ၐᎺអὲ⍚❂⼒ぐ㋺ꁐꁚꑂ\"");
        lexer = new Yylex(lexable);
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.DATUM, lexed.getType());
        Assert.assertEquals("ABCDEFGHIJKLMNOPQRSTUVWXYZ<>:{}abcdefghijklmnopqrstuvwxyz,.;'[]/`123456789-=~!@#$%^&*_+()\r\b\n\t\f\\К௪ၐᎺអὲ⍚❂⼒ぐ㋺ꁐꁚꑂ", lexed.getValue());
    }

    /** Ensures that unexpected characters are a problem between expected characters.
     * @throws IOException if the test fails.
     * @throws DeserializationException if the test fails. */
    @Test
    public void testLexingUnexpectedCharacter() throws IOException, DeserializationException{
        StringReader lexable;
        Yylex lexer;
        Yytoken lexed;
        lexable = new StringReader("{a : b}");
        lexer = new Yylex(lexable);
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.LEFT_BRACE, lexed.getType());
        try{
            lexed = lexer.yylex();
        }catch(final DeserializationException caught){
            Assert.assertEquals(DeserializationException.Problems.UNEXPECTED_CHARACTER, caught.getProblemType());
            Assert.assertEquals(new Character('a'), caught.getUnexpectedObject());
            Assert.assertEquals(1, caught.getPosition());
        }
        /* The exception should have left the lexed token unchanged. */
        Assert.assertEquals(Yytoken.Types.LEFT_BRACE, lexed.getType());
    }

    /** Ensure white space is ignored while lexing outside of Strings.
     * @throws IOException if the test fails.
     * @throws DeserializationException if the test fails. */
    @Test
    public void testLexingWhiteSpace() throws IOException, DeserializationException{
        StringReader lexable;
        Yylex lexer;
        Yytoken lexed;
        lexable = new StringReader("[\t \n\r\n{ \t \t\n\r}");
        lexer = new Yylex(lexable);
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.LEFT_SQUARE, lexed.getType());
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.LEFT_BRACE, lexed.getType());
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.RIGHT_BRACE, lexed.getType());
    }
    /** Ensure concatenated JSON values are lexable.
     *  @throws IOException if the test failed.
     * @throws DeserializationException if the test failed.
     */
    @Test
    public void testLexingConcatenatedJsonValues() throws IOException, DeserializationException{
        StringReader lexable;
        Yylex lexer;
        Yytoken lexed;
        lexable = new StringReader("nullnullnullnull12.33.21truetruenullfalse\"\"{}[]");
        lexer = new Yylex(lexable);
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.DATUM, lexed.getType());
        Assert.assertEquals(null, lexed.getValue());
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.DATUM, lexed.getType());
        Assert.assertEquals(null, lexed.getValue());
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.DATUM, lexed.getType());
        Assert.assertEquals(null, lexed.getValue());
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.DATUM, lexed.getType());
        Assert.assertEquals(null, lexed.getValue());
        try{
            lexed = lexer.yylex();
        }catch(DeserializationException caught){
            /* Concatenated numbers don't always work well. */
            Assert.assertEquals(DeserializationException.Problems.UNEXPECTED_EXCEPTION, caught.getProblemType());
        }
        try{
            lexed = lexer.yylex();
        }catch(DeserializationException caught){
            /* Concatenated numbers don't always work well. */
            Assert.assertEquals(DeserializationException.Problems.UNEXPECTED_CHARACTER, caught.getProblemType());
            Assert.assertEquals(21, caught.getPosition());
        }
        /* Instead of the 12.3 and 3.21 concatenated together we ended up with 21! */
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.DATUM, lexed.getType());
        Assert.assertEquals(new BigDecimal("21"), lexed.getValue());
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.DATUM, lexed.getType());
        Assert.assertEquals(true, lexed.getValue());
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.DATUM, lexed.getType());
        Assert.assertEquals(true, lexed.getValue());
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.DATUM, lexed.getType());
        Assert.assertEquals(null, lexed.getValue());
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.DATUM, lexed.getType());
        Assert.assertEquals(false, lexed.getValue());
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.DATUM, lexed.getType());
        Assert.assertEquals("", lexed.getValue());
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.LEFT_BRACE, lexed.getType());
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.RIGHT_BRACE, lexed.getType());
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.LEFT_SQUARE, lexed.getType());
        lexed = lexer.yylex();
        Assert.assertEquals(Yytoken.Types.RIGHT_SQUARE, lexed.getType());
        
    }
}