mirror of
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330 lines
8.7 KiB
Plaintext
330 lines
8.7 KiB
Plaintext
/*
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* Copyright 1993, 2000 Christopher Seiwald.
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*
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* This file is part of Jam - see jam.c for Copyright information.
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*/
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/* This file is ALSO:
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* Copyright 2001-2004 David Abrahams.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
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*/
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/*
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* jamgram.yy - jam grammar
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*
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* 04/13/94 (seiwald) - added shorthand L0 for null list pointer
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* 06/01/94 (seiwald) - new 'actions existing' does existing sources
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* 08/23/94 (seiwald) - Support for '+=' (append to variable)
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* 08/31/94 (seiwald) - Allow ?= as alias for "default =".
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* 09/15/94 (seiwald) - if conditionals take only single arguments, so
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* that 'if foo == bar' gives syntax error (use =).
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* 02/11/95 (seiwald) - when scanning arguments to rules, only treat
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* punctuation keywords as keywords. All arg lists
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* are terminated with punctuation keywords.
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*
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* 09/11/00 (seiwald) - Support for function calls:
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*
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* Rules now return lists (LIST *), rather than void.
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*
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* New "[ rule ]" syntax evals rule into a LIST.
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*
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* Lists are now generated by compile_list() and
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* compile_append(), and any other rule that indirectly
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* makes a list, rather than being built directly here,
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* so that lists values can contain rule evaluations.
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*
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* New 'return' rule sets the return value, though
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* other statements also may have return values.
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*
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* 'run' production split from 'block' production so
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* that empty blocks can be handled separately.
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*/
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%token ARG STRING
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%left `||` `|`
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%left `&&` `&`
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%left `=` `!=` `in`
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%left `<` `<=` `>` `>=`
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%left `!`
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%{
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#include "jam.h"
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#include "lists.h"
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#include "parse.h"
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#include "scan.h"
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#include "compile.h"
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#include "object.h"
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#include "rules.h"
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# define YYMAXDEPTH 10000 /* for OSF and other less endowed yaccs */
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# define F0 -1
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# define P0 (PARSE *)0
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# define S0 (OBJECT *)0
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# define pappend( l,r ) parse_make( PARSE_APPEND,l,r,P0,S0,S0,0 )
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# define peval( c,l,r ) parse_make( PARSE_EVAL,l,r,P0,S0,S0,c )
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# define pfor( s,l,r,x ) parse_make( PARSE_FOREACH,l,r,P0,s,S0,x )
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# define pif( l,r,t ) parse_make( PARSE_IF,l,r,t,S0,S0,0 )
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# define pincl( l ) parse_make( PARSE_INCLUDE,l,P0,P0,S0,S0,0 )
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# define plist( s ) parse_make( PARSE_LIST,P0,P0,P0,s,S0,0 )
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# define plocal( l,r,t ) parse_make( PARSE_LOCAL,l,r,t,S0,S0,0 )
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# define pmodule( l,r ) parse_make( PARSE_MODULE,l,r,P0,S0,S0,0 )
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# define pclass( l,r ) parse_make( PARSE_CLASS,l,r,P0,S0,S0,0 )
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# define pnull() parse_make( PARSE_NULL,P0,P0,P0,S0,S0,0 )
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# define pon( l,r ) parse_make( PARSE_ON,l,r,P0,S0,S0,0 )
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# define prule( s,p ) parse_make( PARSE_RULE,p,P0,P0,s,S0,0 )
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# define prules( l,r ) parse_make( PARSE_RULES,l,r,P0,S0,S0,0 )
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# define pset( l,r,a ) parse_make( PARSE_SET,l,r,P0,S0,S0,a )
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# define pset1( l,r,t,a ) parse_make( PARSE_SETTINGS,l,r,t,S0,S0,a )
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# define psetc( s,p,a,l ) parse_make( PARSE_SETCOMP,p,a,P0,s,S0,l )
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# define psete( s,l,s1,f ) parse_make( PARSE_SETEXEC,l,P0,P0,s,s1,f )
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# define pswitch( l,r ) parse_make( PARSE_SWITCH,l,r,P0,S0,S0,0 )
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# define pwhile( l,r ) parse_make( PARSE_WHILE,l,r,P0,S0,S0,0 )
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# define pnode( l,r ) parse_make( F0,l,r,P0,S0,S0,0 )
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# define psnode( s,l ) parse_make( F0,l,P0,P0,s,S0,0 )
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%}
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%%
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run : /* empty */
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/* do nothing */
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| rules
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{ parse_save( $1.parse ); }
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;
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/*
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* block - zero or more rules
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* rules - one or more rules
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* rule - any one of jam's rules
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* right-recursive so rules execute in order.
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*/
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block : null
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{ $$.parse = $1.parse; }
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| rules
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{ $$.parse = $1.parse; }
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;
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rules : rule
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{ $$.parse = $1.parse; }
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| rule rules
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{ $$.parse = prules( $1.parse, $2.parse ); }
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| `local` list assign_list_opt `;` block
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{ $$.parse = plocal( $2.parse, $3.parse, $5.parse ); }
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;
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null : /* empty */
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{ $$.parse = pnull(); }
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;
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assign_list_opt : `=` list
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{ $$.parse = $2.parse; $$.number = ASSIGN_SET; }
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| null
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{ $$.parse = $1.parse; $$.number = ASSIGN_APPEND; }
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;
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arglist_opt : `(` lol `)`
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{ $$.parse = $2.parse; }
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{ $$.parse = P0; }
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;
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local_opt : `local`
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{ $$.number = 1; }
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| /* empty */
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{ $$.number = 0; }
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;
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rule : `{` block `}`
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{ $$.parse = $2.parse; }
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| `include` list `;`
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{ $$.parse = pincl( $2.parse ); }
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| ARG lol `;`
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{ $$.parse = prule( $1.string, $2.parse ); }
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| arg assign list `;`
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{ $$.parse = pset( $1.parse, $3.parse, $2.number ); }
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| arg `on` list assign list `;`
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{ $$.parse = pset1( $1.parse, $3.parse, $5.parse, $4.number ); }
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| `return` list `;`
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{ $$.parse = $2.parse; }
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| `for` local_opt ARG `in` list `{` block `}`
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{ $$.parse = pfor( $3.string, $5.parse, $7.parse, $2.number ); }
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| `switch` list `{` cases `}`
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{ $$.parse = pswitch( $2.parse, $4.parse ); }
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| `if` expr `{` block `}`
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{ $$.parse = pif( $2.parse, $4.parse, pnull() ); }
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| `module` list `{` block `}`
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{ $$.parse = pmodule( $2.parse, $4.parse ); }
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| `class` lol `{` block `}`
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{ $$.parse = pclass( $2.parse, $4.parse ); }
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| `while` expr `{` block `}`
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{ $$.parse = pwhile( $2.parse, $4.parse ); }
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| `if` expr `{` block `}` `else` rule
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{ $$.parse = pif( $2.parse, $4.parse, $7.parse ); }
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| local_opt `rule` ARG arglist_opt rule
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{ $$.parse = psetc( $3.string, $5.parse, $4.parse, $1.number ); }
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| `on` arg rule
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{ $$.parse = pon( $2.parse, $3.parse ); }
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| `actions` eflags ARG bindlist `{`
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{ yymode( SCAN_STRING ); }
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STRING
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{ yymode( SCAN_NORMAL ); }
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`}`
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{ $$.parse = psete( $3.string,$4.parse,$7.string,$2.number ); }
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;
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/*
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* assign - = or +=
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*/
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assign : `=`
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{ $$.number = ASSIGN_SET; }
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| `+=`
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{ $$.number = ASSIGN_APPEND; }
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| `?=`
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{ $$.number = ASSIGN_DEFAULT; }
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| `default` `=`
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{ $$.number = ASSIGN_DEFAULT; }
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;
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/*
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* expr - an expression for if
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*/
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expr : arg
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{ $$.parse = peval( EXPR_EXISTS, $1.parse, pnull() ); }
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| expr `=` expr
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{ $$.parse = peval( EXPR_EQUALS, $1.parse, $3.parse ); }
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| expr `!=` expr
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{ $$.parse = peval( EXPR_NOTEQ, $1.parse, $3.parse ); }
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| expr `<` expr
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{ $$.parse = peval( EXPR_LESS, $1.parse, $3.parse ); }
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| expr `<=` expr
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{ $$.parse = peval( EXPR_LESSEQ, $1.parse, $3.parse ); }
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| expr `>` expr
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{ $$.parse = peval( EXPR_MORE, $1.parse, $3.parse ); }
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| expr `>=` expr
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{ $$.parse = peval( EXPR_MOREEQ, $1.parse, $3.parse ); }
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| expr `&` expr
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{ $$.parse = peval( EXPR_AND, $1.parse, $3.parse ); }
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| expr `&&` expr
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{ $$.parse = peval( EXPR_AND, $1.parse, $3.parse ); }
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| expr `|` expr
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{ $$.parse = peval( EXPR_OR, $1.parse, $3.parse ); }
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| expr `||` expr
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{ $$.parse = peval( EXPR_OR, $1.parse, $3.parse ); }
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| arg `in` list
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{ $$.parse = peval( EXPR_IN, $1.parse, $3.parse ); }
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| `!` expr
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{ $$.parse = peval( EXPR_NOT, $2.parse, pnull() ); }
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| `(` expr `)`
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{ $$.parse = $2.parse; }
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;
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/*
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* cases - action elements inside a 'switch'
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* case - a single action element inside a 'switch'
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* right-recursive rule so cases can be examined in order.
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*/
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cases : /* empty */
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{ $$.parse = P0; }
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| case cases
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{ $$.parse = pnode( $1.parse, $2.parse ); }
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;
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case : `case` ARG `:` block
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{ $$.parse = psnode( $2.string, $4.parse ); }
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;
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/*
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* lol - list of lists
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* right-recursive rule so that lists can be added in order.
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*/
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lol : list
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{ $$.parse = pnode( P0, $1.parse ); }
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| list `:` lol
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{ $$.parse = pnode( $3.parse, $1.parse ); }
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;
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/*
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* list - zero or more args in a LIST
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* listp - list (in puncutation only mode)
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* arg - one ARG or function call
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*/
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list : listp
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{ $$.parse = $1.parse; yymode( SCAN_NORMAL ); }
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;
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listp : /* empty */
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{ $$.parse = pnull(); yymode( SCAN_PUNCT ); }
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| listp arg
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{ $$.parse = pappend( $1.parse, $2.parse ); }
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;
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arg : ARG
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{ $$.parse = plist( $1.string ); }
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| `[` { yymode( SCAN_NORMAL ); } func `]`
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{ $$.parse = $3.parse; }
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;
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/*
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* func - a function call (inside [])
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* This needs to be split cleanly out of 'rule'
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*/
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func : ARG lol
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{ $$.parse = prule( $1.string, $2.parse ); }
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| `on` arg ARG lol
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{ $$.parse = pon( $2.parse, prule( $3.string, $4.parse ) ); }
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| `on` arg `return` list
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{ $$.parse = pon( $2.parse, $4.parse ); }
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;
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/*
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* eflags - zero or more modifiers to 'executes'
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* eflag - a single modifier to 'executes'
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*/
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eflags : /* empty */
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{ $$.number = 0; }
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| eflags eflag
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{ $$.number = $1.number | $2.number; }
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;
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eflag : `updated`
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{ $$.number = EXEC_UPDATED; }
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| `together`
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{ $$.number = EXEC_TOGETHER; }
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| `ignore`
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{ $$.number = EXEC_IGNORE; }
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| `quietly`
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{ $$.number = EXEC_QUIETLY; }
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| `piecemeal`
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{ $$.number = EXEC_PIECEMEAL; }
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| `existing`
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{ $$.number = EXEC_EXISTING; }
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;
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/*
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* bindlist - list of variable to bind for an action
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*/
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bindlist : /* empty */
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{ $$.parse = pnull(); }
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| `bind` list
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{ $$.parse = $2.parse; }
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;
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