import org.yaml.snakeyaml.tokens.BlockEndToken; //导入依赖的package包/类
public void testGetToken() {
    String data = "string: abcd";
    StreamReader reader = new StreamReader(data);
    Scanner scanner = new ScannerImpl(reader);
    Mark dummy = new Mark("dummy", 0, 0, 0, "", 0);
    LinkedList<Token> etalonTokens = new LinkedList<Token>();
    etalonTokens.add(new StreamStartToken(dummy, dummy));
    etalonTokens.add(new BlockMappingStartToken(dummy, dummy));
    etalonTokens.add(new KeyToken(dummy, dummy));
    etalonTokens.add(new ScalarToken("string", true, dummy, dummy, (char) 0));
    etalonTokens.add(new ValueToken(dummy, dummy));
    etalonTokens.add(new ScalarToken("abcd", true, dummy, dummy, (char) 0));
    etalonTokens.add(new BlockEndToken(dummy, dummy));
    etalonTokens.add(new StreamEndToken(dummy, dummy));
    while (!etalonTokens.isEmpty() && scanner.checkToken(etalonTokens.get(0).getTokenId())) {
        assertEquals(etalonTokens.removeFirst(), scanner.getToken());
    }
    assertFalse("Must contain no more tokens: " + scanner.getToken(),
            scanner.checkToken(new Token.ID[0]));
}
 

import org.yaml.snakeyaml.tokens.BlockEndToken; //导入依赖的package包/类
/**
 * * Handle implicitly ending multiple levels of block nodes by decreased
 * indentation. This function becomes important on lines 4 and 7 of this
 * example:
 * 
 * <pre>
 * 1) book one:
 * 2)   part one:
 * 3)     chapter one
 * 4)   part two:
 * 5)     chapter one
 * 6)     chapter two
 * 7) book two:
 * </pre>
 * 
 * In flow context, tokens should respect indentation. Actually the
 * condition should be `self.indent &gt;= column` according to the spec. But
 * this condition will prohibit intuitively correct constructions such as
 * key : { } </pre>
 */
private void unwindIndent(int col) {
    // In the flow context, indentation is ignored. We make the scanner less
    // restrictive then specification requires.
    if (this.flowLevel != 0) {
        return;
    }

    // In block context, we may need to issue the BLOCK-END tokens.
    while (this.indent > col) {
        Mark mark = reader.getMark();
        this.indent = this.indents.pop();
        this.tokens.add(new BlockEndToken(mark, mark));
    }
}
 

import org.yaml.snakeyaml.tokens.BlockEndToken; //导入依赖的package包/类
/**
 * * Handle implicitly ending multiple levels of block nodes by decreased indentation. This function becomes important on lines 4 and 7
 * of this example:
 * 
 * <pre>
 * 1) book one:
 * 2)   part one:
 * 3)     chapter one
 * 4)   part two:
 * 5)     chapter one
 * 6)     chapter two
 * 7) book two:
 * </pre>
 * 
 * In flow context, tokens should respect indentation. Actually the condition should be `self.indent &gt;= column` according to the
 * spec. But this condition will prohibit intuitively correct constructions such as key : { } </pre>
 */
private void unwindIndent(final int col) {
	// In the flow context, indentation is ignored. We make the scanner less
	// restrictive then specification requires.
	if (this.flowLevel != 0) {
		return;
	}

	// In block context, we may need to issue the BLOCK-END tokens.
	while (this.indent > col) {
		Mark mark = reader.getMark();
		this.indent = this.indents.pop();
		this.tokens.add(new BlockEndToken(mark, mark));
	}
}