.c 72;Help file for PRETTY (2 Pages)
.c 72;Version No. 8.2, Feb. 1982
.sk.rm 72
PRETTY is a utility program which accepts a BLISS (-16, -32, or -36) 
source file and produces a reformatted source file (and optionally
a specially formatted listing file),
using generally accepted guidelines for formatting rules. 
The output file will have all whitespace (except in strings,
macro definitions, and comments) removed and replaced. 
Control expressions are indented according to hierarchical structure.
.sk1
To invoke PRETTY, type RUN BLI:PRETTY. It will prompt with '*' for a 
file specification line of the form
.sk;.center;[outspec [, listspec] =] inputspec [/(NO)LOG]
.sk;where 'inputspec' is the source file specification 
(default type = 'BLI') and 'listspec' is the listing file specification 
(default type = 'LST', name = the input file name). /NOLOG (the default)
will display no syntax errors, module names, or timing. If errors are
detected during parsing with /NOLOG, an informational message will be output to
the terminal. /LOG will display all of the above.
The output filespec designates the new, reformatted source file. If
it is omitted, the input file is renamed with an extension of 'BLF'
and the output is given the filespec of the input.
(Note: Production of the listing file approximately doubles PRETTY run time.)
.sk
Formatting options are supplied to PRETTY by means of directives 
inserted as full-line comments into the source text.
The comments have the general form
.br;.nf
	!<BLF/directive>	example: !<BLF/remark:9>
.br;.f;where "directive" may be one of the following
(either lower or upper case may be used):
.sk
.lm 8
.i -8;REQUIRE'file-spec'
.br
Accesses the specified file for further options of the following types.
The specified file must not contain another REQUIRE directive.
.i -8;PAGE
.br
Produces a page break (formfeed) after the comment line.
.i -8;WIDTH:n (D= 110)
.br
Causes the output file line width to be set to "n" columns, where
71_<n_<141.
.i -8;REMARK:n (D= 6)
.br
Causes the remark column to be set to 8*n+1, i.e., "n" tabs are
issued to place the "!" in the proper column. The range of n 
is 2_<n_<16.
.i -8;NOFORMAT
.br
Inhibits automatic formatting until a PAGE or FORMAT
directive is encountered.
.i -8;FORMAT (D)
.br
Resumes automatic formatting.
.i -8;NOMACRO (D)
.br
Causes formatting of macro definitions to be inhibited until a
subsequent MACRO directive is found.
.page
.i -8;MACRO
.br
Causes macros to be formatted (which may cause error messages to be 
issued) until a subsequent NOMACRO directive is found.
.i -8;PLIT
.br
Causes the second and following lines of PLIT or UPLIT bodies to be formatted.
This may produce layouts inferior to hand-formatting, e.g. in
large tables of constant values.
.i -8;NOPLIT (D)
.br;Inhibits formatting of the second and following lines of PLITs.
.i -8;NOERROR
.br
Inhibits the insertion of error messages into the output files (they
will appear at the terminal only).
.i -8;ERROR (D)
.br
Resumes the insertion of error messages into the output files.
Error messages are automatically deleted from source files on subsequent
runs.
.i -8;LOWERCASE__KEY
.br
Causes BLISS keywords to appear in lower case.
.i -8;LOWERCASE__USER
.br
Causes user names to appear in lower case.
.i -8;LOWERCASE
.br
Causes all names and keywords to appear in lower case.
.i -8;UPPERCASE__KEY
.br
Causes BLISS keywords to appear in upper case.
.i -8;UPPERCASE__USER
.br
Causes user names to appear in upper case.
.i -8;UPPERCASE
.br
Causes all names and keywords to appear in upper case. 
.i -8;NOCASE__KEY
.br
Causes BLISS keywords to be left alone.
.i -8;NOCASE__USER
.br
Causes user names to be left alone.
.i -8;NOCASE (D)
.br
Causes all names and keywords to be left alone.
.i -8;SYNONYM name = lexeme lexeme lexeme ...
3 SYNONYM name = lexeme lexeme lexeme ...
.br;Allows PRETTY to associate with "name" one or more lexemes
for formatting and syntax checking. The general use is for XPORT
or user-defined BLISS macros in instances where PRETTY would
consider such macros syntactically incorrect. Subsequent
occurrences of "name" will be treated as if the given sequence of
associated lexemes had been parsed. The special token "*" can be
used to indicate where to position "name" with regard to the normal
position of the tokens that it replaces. This is for formatting
purposes. Only "name"  will be output.
.sk
For example,
.BR;####!<BLF/SYNONYM ELIF = ELSE IF * >
.br;permits the sequence
.br;####IF expr THEN expr ELIF expr THEN expr;
.br;to be formatted without error messages. (The name, ELIF, is
output, but it is parsed and indented as though ELSE IF had been found there.)