This is bovine.info, produced by makeinfo version 6.0 from bovine.texi.

This manual documents Bovine parser development in Semantic

Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004 Eric M. Ludlam
Copyright (C) 2001, 2002, 2003, 2004 David Ponce Copyright (C) 2002,
2003 Richard Y. Kim

     Permission is granted to copy, distribute and/or modify this
     document under the terms of the GNU Free Documentation License,
     Version 1.1 or any later version published by the Free Software
     Foundation; with the Invariant Sections being list their titles,
     with the Front-Cover Texts being list, and with the Back-Cover
     Texts being list.  A copy of the license is included in the section
     entitled "GNU Free Documentation License".
INFO-DIR-SECTION Emacs
START-INFO-DIR-ENTRY
* Semantic bovine parser development: (bovine).
END-INFO-DIR-ENTRY

   This file documents parser development with the bovine parser
generator _Infrastructure for parser based text analysis in Emacs_

   Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004 Eric M. Ludlam,
David Ponce, and Richard Y. Kim


File: bovine.info,  Node: Top,  Next: Starting Rules,  Up: (dir)

Bovine parser development
*************************

The "bovine" parser is the original semantic parser, and is an
implementation of an LL parser.  It is good for simple languages.  It
has many conveniences making grammar writing easy.  The conveniences
make it less powerful than a Bison-like LALR parser.  For more
information, *note the Wisent Parser Manual: (wisent)top.

Bovine LL grammars are stored in files with a '.by' extension.  When
compiled, the contents is converted into a file of the form
'NAME-by.el'.  This, in turn is byte compiled.  *note Grammar Framework
Manual: (grammar-fw)top.

* Menu:

* Starting Rules::              The starting rules for the grammar.
* Bovine Grammar Rules::        Rules used to parse a language
* Optional Lambda Expression::  Actions to take when a rule is matched
* Bovine Examples::             Simple Samples
* GNU Free Documentation License::  
* Index::                       


File: bovine.info,  Node: Starting Rules,  Next: Bovine Grammar Rules,  Prev: Top,  Up: Top

1 Starting Rules
****************

In Bison, one and only one nonterminal is designated as the "start"
symbol.  In semantic, one or more nonterminals can be designated as the
"start" symbol.  They are declared following the '%start' keyword
separated by spaces.  *note (grammar-fw)start Decl::.

If no '%start' keyword is used in a grammar, then the very first is
used.  Internally the first start nonterminal is targeted by the
reserved symbol 'bovine-toplevel', so it can be found by the parser
harness.

To find locally defined variables, the local context handler needs to
parse the body of functional code.  The 'scopestart' declaration
specifies the name of a nonterminal used as the goal to parse a local
context, *note (grammar-fw)scopestart Decl::.  Internally the scopestart
nonterminal is targeted by the reserved symbol 'bovine-inner-scope', so
it can be found by the parser harness.


File: bovine.info,  Node: Bovine Grammar Rules,  Next: Optional Lambda Expression,  Prev: Starting Rules,  Up: Top

2 Bovine Grammar Rules
**********************

The rules are what allow the compiler to create tags from a language
file.  Once the setup is done in the prologue, you can start writing
rules.  *note (grammar-fw)Grammar Rules::.

     RESULT : COMPONENTS1 OPTIONAL-SEMANTIC-ACTION1)
            | COMPONENTS2 OPTIONAL-SEMANTIC-ACTION2
            ;

RESULT is a nonterminal, that is a symbol synthesized in your grammar.
COMPONENTS is a list of elements that are to be matched if RESULT is to
be made.  OPTIONAL-SEMANTIC-ACTION is an optional sequence of simplified
Emacs Lisp expressions for concocting the parse tree.

In bison, each time an element of COMPONENTS is found, it is "shifted"
onto the parser stack.  (The stack of matched elements.)  When all
COMPONENTS' elements have been matched, it is "reduced" to RESULT.
*Note (bison)Algorithm::.

A particular RESULT written into your grammar becomes the parser's goal.
It is designated by a '%start' statement (*note Starting Rules::).  The
value returned by the associated OPTIONAL-SEMANTIC-ACTION is the
parser's result.  It should be a tree of semantic "tags", *note
(semantic-appdev)Semantic Tags::.

COMPONENTS is made up of symbols.  A symbol such as 'FOO' means that a
syntactic token of class 'FOO' must be matched.

* Menu:

* How Lexical Tokens Match::    
* Grammar-to-Lisp Details::     
* Order of components in rules::  


File: bovine.info,  Node: How Lexical Tokens Match,  Next: Grammar-to-Lisp Details,  Up: Bovine Grammar Rules

2.1 How Lexical Tokens Match
============================

A lexical rule must be used to define how to match a lexical token.

For instance:

     %keyword FOO "foo"

Means that 'FOO' is a reserved language keyword, matched as such by
looking up into a keyword table, *note (grammar-fw)keyword Decl::.  This
is because '"foo"' will be converted to 'FOO' in the lexical analysis
stage.  Thus the symbol 'FOO' won't be available any other way.

If we specify our token in this way:

     %token <symbol> FOO "foo"

then 'FOO' will match the string '"foo"' explicitly, but it won't do so
at the lexical level, allowing use of the text '"foo"' in other forms of
regular expressions.

In that case, 'FOO' is a 'symbol'-type token.  To match, a 'symbol' must
first be encountered, and then it must 'string-match "foo"'.

*Caution:*
     Be especially careful to remember that '"foo"', and more generally
     the %token's match-value string, is a regular expression!

Non symbol tokens are also allowed.  For example:

     %token <punctuation> PERIOD "[.]"

     filename : symbol PERIOD symbol
              ;

'PERIOD' is a 'punctuation'-type token that will explicitly match one
period when used in the above rule.

*Please Note:*
     'symbol', 'punctuation', etc., are predefined lexical token types,
     based on the "syntax class"-character associations currently in
     effect.


File: bovine.info,  Node: Grammar-to-Lisp Details,  Next: Order of components in rules,  Prev: How Lexical Tokens Match,  Up: Bovine Grammar Rules

2.2 Grammar-to-Lisp Details
===========================

For the bovinator, lexical token matching patterns are _inlined_.  When
the grammar-to-lisp converter encounters a lexical token declaration of
the form:

     %token <TYPE> TOKEN-NAME MATCH-VALUE

It substitutes every occurrences of TOKEN-NAME in rules, by its expanded
form:

     TYPE MATCH-VALUE

For example:

     %token <symbol> MOOSE "moose"

     find_a_moose: MOOSE
                 ;

Will generate this pseudo equivalent-rule:

     find_a_moose: symbol "moose"   ;; invalid syntax!
                 ;

Thus, from the bovinator point of view, the COMPONENTS part of a rule is
made up of symbols and strings.  A string in the mix means that the
previous symbol must have the additional constraint of exactly matching
it, as described in *note How Lexical Tokens Match::.

*Please Note:*
     For the bovinator, this task was mixed into the language definition
     to simplify implementation, though Bison's technique is more
     efficient.


File: bovine.info,  Node: Order of components in rules,  Prev: Grammar-to-Lisp Details,  Up: Bovine Grammar Rules

2.3 Order of components in rules
================================

If a rule has multiple components, order is important, for example

     headerfile : symbol PERIOD symbol
                | symbol
                ;

would match 'foo.h' or the C++ header 'foo'.  The bovine parser will
first attempt to match the long form, and then the short form.  If they
were in reverse order, then the long form would never be tested.


File: bovine.info,  Node: Optional Lambda Expression,  Next: Bovine Examples,  Prev: Bovine Grammar Rules,  Up: Top

3 Optional Lambda Expressions
*****************************

The OLE ("Optional Lambda Expression") is converted into a bovine
lambda.  This lambda has special short-cuts to simplify reading the
semantic action definition.  An OLE like this:

     ( $1 )

results in a lambda return which consists entirely of the string or
object found by matching the first (zeroth) element of match.  An OLE
like this:

     ( ,(foo $1) )

executes 'foo' on the first argument, and then splices its return into
the return list whereas:

     ( (foo $1) )

executes 'foo', and that is placed in the return list.

Here are other things that can appear inline:

'$1'
     The first object matched.

',$1'
     The first object spliced into the list (assuming it is a list from
     a non-terminal).

''$1'
     The first object matched, placed in a list.  i.e.  '( $1 )'.

'foo'
     The symbol 'foo' (exactly as displayed).

'(foo)'
     A function call to foo which is stuck into the return list.

',(foo)'
     A function call to foo which is spliced into the return list.

''(foo)'
     A function call to foo which is stuck into the return list in a
     list.

'(EXPAND $1 NONTERMINAL DEPTH)'
     A list starting with 'EXPAND' performs a recursive parse on the
     token passed to it (represented by '$1' above.)  The "semantic
     list" is a common token to expand, as there are often interesting
     things in the list.  The NONTERMINAL is a symbol in your table
     which the bovinator will start with when parsing.  NONTERMINAL's
     definition is the same as any other nonterminal.  DEPTH should be
     at least '1' when descending into a semantic list.

'(EXPANDFULL $1 NONTERMINAL DEPTH)'
     Is like 'EXPAND', except that the parser will iterate over
     NONTERMINAL until there are no more matches.  (The same way the
     parser iterates over the starting rule (*note Starting Rules::).
     This lets you have much simpler rules in this specific case, and
     also lets you have positional information in the returned tokens,
     and error skipping.

'(ASSOC SYMBOL1 VALUE1 SYMBOL2 VALUE2 ...)'
     This is used for creating an association list.  Each SYMBOL is
     included in the list if the associated VALUE is non-'nil'.  While
     the items are all listed explicitly, the created structure is an
     association list of the form:

          ((SYMBOL1 . VALUE1) (SYMBOL2 . VALUE2) ...)

'(TAG NAME CLASS [ATTRIBUTES])'
     This creates one tag in the current buffer.

     NAME
          Is a string that represents the tag in the language.

     CLASS
          Is the kind of tag being create, such as 'function', or
          'variable', though any symbol will work.

     ATTRIBUTES
          Is an optional set of labeled values such as
          ':constant-flag t :parent "parenttype"'.

'(TAG-VARIABLE NAME TYPE DEFAULT-VALUE [ATTRIBUTES])'
'(TAG-FUNCTION NAME TYPE ARG-LIST [ATTRIBUTES])'
'(TAG-TYPE NAME TYPE MEMBERS PARENTS [ATTRIBUTES])'
'(TAG-INCLUDE NAME SYSTEM-FLAG [ATTRIBUTES])'
'(TAG-PACKAGE NAME DETAIL [ATTRIBUTES])'
'(TAG-CODE NAME DETAIL [ATTRIBUTES])'
     Create a tag with NAME of respectively the class 'variable',
     'function', 'type', 'include', 'package', and 'code'.  See *note
     (semantic-appdev)Creating Tags:: for the lisp functions these
     translate into.

If the symbol '%quotemode backquote' is specified, then use ',@' to
splice a list in, and ',' to evaluate the expression.  This lets you
send '$1' as a symbol into a list instead of having it expanded inline.


File: bovine.info,  Node: Bovine Examples,  Next: GNU Free Documentation License,  Prev: Optional Lambda Expression,  Up: Top

4 Examples
**********

The rule:

     any-symbol: symbol
               ;

is equivalent to

     any-symbol: symbol
                 ( $1 )
               ;

which, if it matched the string '"A"', would return

     ( "A" )

If this rule were used like this:

     %token <punctuation> EQUAL "="
     ...
     assign: any-symbol EQUAL any-symbol
             ( $1 $3 )
           ;

it would match '"A=B"', and return

     ( ("A") ("B") )

The letters 'A' and 'B' come back in lists because 'any-symbol' is a
nonterminal, not an actual lexical element.

To get a better result with nonterminals, use , to splice lists in like
this:

     %token <punctuation> EQUAL "="
     ...
     assign: any-symbol EQUAL any-symbol
             ( ,$1 ,$3 )
           ;

which would return

     ( "A" "B" )


File: bovine.info,  Node: GNU Free Documentation License,  Next: Index,  Prev: Bovine Examples,  Up: Top

Appendix A GNU Free Documentation License
*****************************************

                        Version 1.1, March 2000

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ADDENDUM: How to use this License for your documents
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recommend releasing these examples in parallel under your choice of free
software license, such as the GNU General Public License, to permit
their use in free software.


File: bovine.info,  Node: Index,  Prev: GNU Free Documentation License,  Up: Top

Index
*****



Tag Table:
Node: Top1097
Node: Starting Rules2098
Node: Bovine Grammar Rules3090
Node: How Lexical Tokens Match4600
Node: Grammar-to-Lisp Details6098
Node: Order of components in rules7259
Node: Optional Lambda Expression7801
Node: Bovine Examples11449
Node: GNU Free Documentation License12377
Node: Index32019

End Tag Table
