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  24 .TH jstyle 1 "22 November 2005"
  25 .SH NAME
  26 .I jstyle
  27 \- check for some common stylistic errors in Java source files
  28 .SH SYNOPSIS
  29 \fBjstyle [-chptvC] [file...]\fP
  30 .LP
  31 .SH DESCRIPTION
  32 .IX "OS-Net build tools" "jstyle" "" "\fBjstyle\fP"
  33 .LP
  34 .B jstyle
  35 inspects Java source files (*.java) for common stylistic errors.  It
  36 is similar to
  37 .BR cstyle (1)
  38 in that it attempts to check for the style
  39 documented in \fI/shared/ON/general_docs/cstyle.ms.pdf\fP, although by
  40 necessity is modified to work with Java-specific constructs.  Note that
  41 there is much in that document that
  42 .I cannot
  43 be checked for; just because your code is
  44 .BR jstyle (1)
  45 clean does not
  46 mean that you've followed Sun's Java style.  \fICaveat emptor\fP.
  47 .LP
  48 .SH OPTIONS
  49 .LP
  50 The following options are supported:
  51 .TP 4
  52 .B \-c
  53 Check continuation line indentation inside of functions.  Sun's C style
  54 states that all statements must be indented to an appropriate tab stop,
  55 and any continuation lines after them must be indented \fIexactly\fP four
  56 spaces from the start line.  This option enables a series of checks
  57 designed to find contination line problems within functions only.
  58 .LP
  59 .TP 4
  60 .B \-h
  61 Performs heuristic checks that are sometimes wrong.  Not generally used.
  62 .LP
  63 .TP 4
  64 .B \-p
  65 Performs some of the more picky checks.  You should generally use this.
  66 .LP
  67 .LP
  68 .TP 4
  69 .B \-t
  70 Insists on indentation with tabs.  Because of the depth of nested blocks
  71 that Java requires, and the commonality of long identifiers, tab
  72 indentation in Java code is not always useful, assuming that tabs are fixed
  73 at eight columns and that maximum line length is fixed at eighty columns,
  74 so this option is not on by default.  If you choose to consider tabs to be
  75 four columns wide (not acceptable for ON), or are writing simple enough
  76 code that the nesting is not very deep, this option might be useful.
  77 Otherwise, avoid it.
  78 .LP
  79 .TP 4
  80 .B \-v
  81 Verbose output; includes the text of the line of error.
  82 .LP
  83 .TP 4
  84 .B \-C
  85 Ignore errors in header comments (i.e., block comments starting in the
  86 first column).  Not generally used.
  87 .LP
  88 .LP
  89 .SH NOTES
  90 .LP
  91 The jstyle rule for the OS/Net consolidation is that all new files must
  92 be
  93 .B -p
  94 clean.  For existing files, the following invocations are
  95 run against both the old and new files:
  96 .LP
  97 .TP 4
  98 .B "jstyle file"
  99 .LP
 100 .TP 4
 101 .B "jstyle -p file"
 102 .LP
 103 If the old file gave no errors for one of the invocations, the new file
 104 must also give no errors.  This way, files cannot become unclean.
 105 .LP
 106 .SH BUGS
 107 .LP
 108 .BR jstyle (1)
 109 cannot disambiguate Java generic type parameters or
 110 arguments that span multiple lines from relational operators.  For example:
 111 .RS 4
 112 .HP 4
 113 private class Foo<A extends Bar,
 114 .br
 115 B extends Bar> { ...
 116 .RE
 117 .LP
 118 is flagged as two lines with missing spaces around relational operators.