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Figure 31-1 Source code formatting can be a religious topic to some developers. If you re mixing software and religion, you might read Section 34.9, Thou Shalt Rend Software and Religion Asunder before reading the rest of this chapter.
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Objectives of Good Layout
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The results point out the fragility of programming expertise: advanced programmers have strong expectations about what programs should look like, and when those expectations are violated in seemingly innocuous ways their performance drops drastically. Elliot Soloway and Kate Ehrlich
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Many decisions about layout details are a matter of subjective aesthetics often, you can accomplish the same goal in many ways. You can make debates about subjective issues less subjective if you explicitly specify the criteria for your preferences. Explicitly, then, a good layout scheme should:
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Accurately represent the logical structure of the code That s the Fundamental Theorem of Formatting again the primary purpose of good layout is to show the logical structure of the code. Typically, programmers use indentation and other white space to show the logical structure. Consistently represent the logical structure of the code Some styles of layout have rules with so many exceptions that it s hard to follow the rules consistently. A good style applies to most cases.
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31. Layout and Style
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Improve readability An indentation strategy that s logical but that makes the code harder to read is useless. A layout scheme that calls for spaces only where they are required by the compiler is logical but not readable. A good layout scheme makes code easier to read. Withstand modifications The best layout schemes hold up well under code modification. Modifying one line of code shouldn t require modifying several others.
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In addition to these criteria, minimizing the number of lines of code needed to implement a simple statement or block is also sometimes considered.
How to Put the Layout Objectives to Use
You can use the criteria for a good layout scheme to ground a discussion of layout so that the subjective reasons for preferring one style over another are brought into the open. Weighting the criteria in different ways might lead to different conclusions. For example, if you feel strongly that minimizing the number of lines used on the screen is important perhaps because you have a small computer screen you might criticize one style because it uses two more lines for a routine parameter list than another.
6 KEY POINT
31.2 Layout Techniques
You can achieve good layout by using a few layout tools in several different ways. This section describes each of them.
White Space
Usewhitespacetoenhancereadability. White space, including spaces, tabs, line breaks, and blank lines, is the main tool available to you for showing a program s structure.
Som e researchers have explored the similarity between the structure of a book and the structure of a program. For information, see The Book Paradigm for Program Documentation in Section 32.5.
1 CROSS-REFERENCE
You wouldn t think of writing a book with no spaces between words, no paragraph breaks, and no divisions into chapters. Such a book might be readable cover to cover, but it would be virtually impossible to skim it for a line of thought or to find an important passage. Perhaps more important, the book s layout wouldn t show the reader how the author intended to organize the information. The author s organization is an important clue to the topic s logical organization.
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31. Layout and Style
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Breaking a book into chapters, paragraphs, and sentences shows a reader how to mentally organize a topic. If the organization isn t evident, the reader has to provide the organization, which puts a much greater burden on the reader and adds the possibility that the reader may never figure out how the topic is organized. The information contained in a program is denser than the information contained in most books. Whereas you might read and understand a page of a book in a minute or two, most programmers can t read and understand a naked program listing at anything close to that rate. A program should give more organizational clues than a book, not fewer.
Grouping From the other side of the looking glass, white space is grouping, making sure that related statements are grouped together.
In writing, thoughts are grouped into paragraphs. A well-written paragraph contains only sentences that relate to a particular thought. It shouldn t contain extraneous sentences. Similarly, a paragraph of code should contain statements that accomplish a single task and that are related to each other.
Blank lines Just as it s important to group related statements, it s important to separate unrelated statements from each other. The start of a new paragraph in English is identified with indentation or a blank line. The start of a new paragraph of code should be identified with a blank line.
Using blank lines is a way to indicate how a program is organized. You can use them to divide groups of related statements into paragraphs, to separate routines from one another, and to highlight comments. Although this particular statistic may be hard to put to work, a study by Gorla, Benander, and Benander found that the optimal number of blank lines in a program is about 8 to 16 percent. Above 16 percent, debug time increases dramatically (1990).
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