Perl Best Practices [Electronic resources] نسخه متنی

B.1. Chapter 2, Code Layout

• Brace and parenthesize in K&R style. [
  Bracketing ]

• Separate your control keywords from the following opening bracket. [
  Keywords ]

• Don''t separate subroutine or variable names from the following opening bracket. [
  Subroutines and Variables ]

• Don''t use unnecessary parentheses for builtins and "honorary" builtins. [
  Builtins ]

• Separate complex keys or indices from their surrounding brackets. [
  Keys and Indices ]

• Use whitespace to help binary operators stand out from their operands. [
  Operators ]

• Place a semicolon after every statement. [
  Semicolons ]

• Place a comma after every value in a multiline list. [
  Commas ]

• Use 78-column lines. [
  Line Lengths ]

• Use four-column indentation levels. [
  Indentation ]

• Indent with spaces, not tabs. [
  Tabs ]

• Never place two statements on the same line. [
  Blocks ]

• Code in paragraphs. [
  Chunking ]

• Don''t cuddle an else. [
  Elses ]

• Align corresponding items vertically. [
  Vertical Alignment ]

• Break long expressions before an operator. [
  Breaking Long Lines ]

• Factor out long expressions in the middle of statements. [
  Non-Terminal Expressions ]

• Always break a long expression at the operator of the lowest possible precedence. [
  Breaking by Precedence ]

• Break long assignments before the assignment operator. [
  Assignments ]

• Format cascaded ternary operators in columns. [
  Ternaries ]

• Parenthesize long lists. [
  Lists ]

• Enforce your chosen layout style mechanically. [
  Automated Layout ]