mirror of
https://github.com/bulletphysics/bullet3
synced 2024-12-14 22:00:05 +00:00
535 lines
12 KiB
C
535 lines
12 KiB
C
/*
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* Copyright 1993-2002 Christopher Seiwald and Perforce Software, Inc.
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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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/*
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* expand.c - expand a buffer, given variable values
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*
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* External routines:
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*
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* var_expand() - variable-expand input string into list of strings
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*
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* Internal routines:
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*
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* var_edit_parse() - parse : modifiers into PATHNAME structure
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* var_edit_file() - copy input target name to output, modifying filename
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* var_edit_shift() - do upshift/downshift mods
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*
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* 01/25/94 (seiwald) - $(X)$(UNDEF) was expanding like plain $(X)
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* 04/13/94 (seiwald) - added shorthand L0 for null list pointer
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* 01/20/00 (seiwald) - Upgraded from K&R to ANSI C
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* 01/11/01 (seiwald) - added support for :E=emptyvalue, :J=joinval
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* 01/13/01 (seiwald) - :UDJE work on non-filename strings
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* 02/19/01 (seiwald) - make $($(var):J=x) join multiple values of var
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* 01/25/02 (seiwald) - fixed broken $(v[1-]), by ian godin
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* 10/22/02 (seiwald) - list_new() now does its own newstr()/copystr()
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* 11/04/02 (seiwald) - const-ing for string literals
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* 12/30/02 (armstrong) - fix out-of-bounds access in var_expand()
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*/
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# include "jam.h"
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# include "lists.h"
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# include "variable.h"
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# include "expand.h"
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# include "pathsys.h"
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# include "newstr.h"
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typedef struct {
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PATHNAME f; /* :GDBSMR -- pieces */
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char parent; /* :P -- go to parent directory */
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char filemods; /* one of the above applied */
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char downshift; /* :L -- downshift result */
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char upshift; /* :U -- upshift result */
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PATHPART empty; /* :E -- default for empties */
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PATHPART join; /* :J -- join list with char */
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} VAR_EDITS ;
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static void var_edit_parse( const char *mods, VAR_EDITS *edits );
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static void var_edit_file( const char *in, char *out, VAR_EDITS *edits );
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static void var_edit_shift( char *out, VAR_EDITS *edits );
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# define MAGIC_COLON '\001'
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# define MAGIC_LEFT '\002'
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# define MAGIC_RIGHT '\003'
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/*
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* var_expand() - variable-expand input string into list of strings
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*
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* Would just copy input to output, performing variable expansion,
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* except that since variables can contain multiple values the result
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* of variable expansion may contain multiple values (a list). Properly
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* performs "product" operations that occur in "$(var1)xxx$(var2)" or
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* even "$($(var2))".
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*
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* Returns a newly created list.
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*/
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LIST *
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var_expand(
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LIST *l,
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const char *in,
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const char *end,
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LOL *lol,
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int cancopyin )
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{
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char out_buf[ MAXSYM ];
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char *out = out_buf;
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const char *inp = in;
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char *ov; /* for temp copy of variable in outbuf */
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int depth;
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if( DEBUG_VAREXP )
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printf( "expand '%.*s'\n", end - in, in );
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/* This gets alot of cases: $(<) and $(>) */
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if( end - in == 4 && in[0] == '$' && in[1] == '(' && in[3] == ')' )
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{
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switch( in[2] )
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{
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case '1':
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case '<':
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return list_copy( l, lol_get( lol, 0 ) );
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case '2':
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case '>':
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return list_copy( l, lol_get( lol, 1 ) );
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}
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}
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/* Just try simple copy of in to out. */
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while( in < end )
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if( ( *out++ = *in++ ) == '$' && *in == '(' )
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goto expand;
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/* No variables expanded - just add copy of input string to list. */
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/* Cancopyin is an optimization: if the input was already a list */
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/* item, we can use the copystr() to put it on the new list. */
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/* Otherwise, we use the slower newstr(). */
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*out = '\0';
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if( cancopyin )
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return list_new( l, inp, 1 );
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else
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return list_new( l, out_buf, 0 );
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expand:
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/*
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* Input so far (ignore blanks):
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*
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* stuff-in-outbuf $(variable) remainder
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* ^ ^
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* in end
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* Output so far:
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*
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* stuff-in-outbuf $
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* ^ ^
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* out_buf out
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*
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*
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* We just copied the $ of $(...), so back up one on the output.
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* We now find the matching close paren, copying the variable and
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* modifiers between the $( and ) temporarily into out_buf, so that
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* we can replace :'s with MAGIC_COLON. This is necessary to avoid
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* being confused by modifier values that are variables containing
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* :'s. Ugly.
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*/
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depth = 1;
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out--, in++;
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ov = out;
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while( in < end && depth )
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{
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switch( *ov++ = *in++ )
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{
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case '(': depth++; break;
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case ')': depth--; break;
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case ':': ov[-1] = MAGIC_COLON; break;
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case '[': ov[-1] = MAGIC_LEFT; break;
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case ']': ov[-1] = MAGIC_RIGHT; break;
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}
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}
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/* Copied ) - back up. */
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ov--;
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/*
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* Input so far (ignore blanks):
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*
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* stuff-in-outbuf $(variable) remainder
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* ^ ^
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* in end
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* Output so far:
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*
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* stuff-in-outbuf variable
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* ^ ^ ^
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* out_buf out ov
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*
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* Later we will overwrite 'variable' in out_buf, but we'll be
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* done with it by then. 'variable' may be a multi-element list,
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* so may each value for '$(variable element)', and so may 'remainder'.
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* Thus we produce a product of three lists.
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*/
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{
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LIST *variables = 0;
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LIST *remainder = 0;
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LIST *vars;
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/* Recursively expand variable name & rest of input */
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if( out < ov )
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variables = var_expand( L0, out, ov, lol, 0 );
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if( in < end )
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remainder = var_expand( L0, in, end, lol, 0 );
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/* Now produce the result chain */
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/* For each variable name */
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for( vars = variables; vars; vars = list_next( vars ) )
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{
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LIST *value, *evalue = 0;
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char *colon;
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char *bracket;
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char varname[ MAXSYM ];
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int sub1 = 0, sub2 = -1;
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VAR_EDITS edits;
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/* Look for a : modifier in the variable name */
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/* Must copy into varname so we can modify it */
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strcpy( varname, vars->string );
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if( colon = strchr( varname, MAGIC_COLON ) )
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{
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*colon = '\0';
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var_edit_parse( colon + 1, &edits );
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}
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/* Look for [x-y] subscripting */
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/* sub1 is x (0 default) */
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/* sub2 is length (-1 means forever) */
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if( bracket = strchr( varname, MAGIC_LEFT ) )
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{
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char *dash;
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if( dash = strchr( bracket + 1, '-' ) )
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*dash = '\0';
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sub1 = atoi( bracket + 1 ) - 1;
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if( !dash )
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sub2 = 1;
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else if( !dash[1] || dash[1] == MAGIC_RIGHT )
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sub2 = -1;
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else
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sub2 = atoi( dash + 1 ) - sub1;
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*bracket = '\0';
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}
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/* Get variable value, specially handling $(<), $(>), $(n) */
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if( varname[0] == '<' && !varname[1] )
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value = lol_get( lol, 0 );
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else if( varname[0] == '>' && !varname[1] )
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value = lol_get( lol, 1 );
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else if( varname[0] >= '1' && varname[0] <= '9' && !varname[1] )
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value = lol_get( lol, varname[0] - '1' );
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else
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value = var_get( varname );
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/* The fast path: $(x) - just copy the variable value. */
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/* This is only an optimization */
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if( out == out_buf && !bracket && !colon && in == end )
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{
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l = list_copy( l, value );
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continue;
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}
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/* Handle start subscript */
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while( sub1 > 0 && value )
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--sub1, value = list_next( value );
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/* Empty w/ :E=default? */
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if( !value && colon && edits.empty.ptr )
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evalue = value = list_new( L0, edits.empty.ptr, 0 );
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/* For each variable value */
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for( ; value; value = list_next( value ) )
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{
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LIST *rem;
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char *out1;
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/* Handle end subscript (length actually) */
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if( sub2 >= 0 && --sub2 < 0 )
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break;
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/* Apply : mods, if present */
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if( colon && edits.filemods )
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var_edit_file( value->string, out, &edits );
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else
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strcpy( out, value->string );
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if( colon && ( edits.upshift || edits.downshift ) )
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var_edit_shift( out, &edits );
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/* Handle :J=joinval */
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/* If we have more values for this var, just */
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/* keep appending them (with the join value) */
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/* rather than creating separate LIST elements. */
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if( colon && edits.join.ptr &&
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( list_next( value ) || list_next( vars ) ) )
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{
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out += strlen( out );
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strcpy( out, edits.join.ptr );
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out += strlen( out );
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continue;
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}
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/* If no remainder, append result to output chain. */
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if( in == end )
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{
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l = list_new( l, out_buf, 0 );
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continue;
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}
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/* For each remainder, append the complete string */
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/* to the output chain. */
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/* Remember the end of the variable expansion so */
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/* we can just tack on each instance of 'remainder' */
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out1 = out + strlen( out );
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for( rem = remainder; rem; rem = list_next( rem ) )
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{
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strcpy( out1, rem->string );
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l = list_new( l, out_buf, 0 );
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}
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}
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/* Toss used empty */
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if( evalue )
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list_free( evalue );
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}
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/* variables & remainder were gifts from var_expand */
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/* and must be freed */
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if( variables )
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list_free( variables );
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if( remainder)
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list_free( remainder );
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if( DEBUG_VAREXP )
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{
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printf( "expanded to " );
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list_print( l );
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printf( "\n" );
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}
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return l;
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}
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}
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/*
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* var_edit_parse() - parse : modifiers into PATHNAME structure
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*
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* The : modifiers in a $(varname:modifier) currently support replacing
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* or omitting elements of a filename, and so they are parsed into a
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* PATHNAME structure (which contains pointers into the original string).
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*
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* Modifiers of the form "X=value" replace the component X with
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* the given value. Modifiers without the "=value" cause everything
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* but the component X to be omitted. X is one of:
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*
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* G <grist>
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* D directory name
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* B base name
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* S .suffix
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* M (member)
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* R root directory - prepended to whole path
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*
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* This routine sets:
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*
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* f->f_xxx.ptr = 0
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* f->f_xxx.len = 0
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* -> leave the original component xxx
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*
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* f->f_xxx.ptr = string
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* f->f_xxx.len = strlen( string )
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* -> replace component xxx with string
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*
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* f->f_xxx.ptr = ""
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* f->f_xxx.len = 0
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* -> omit component xxx
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*
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* var_edit_file() below and path_build() obligingly follow this convention.
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*/
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static void
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var_edit_parse(
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const char *mods,
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VAR_EDITS *edits )
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{
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int havezeroed = 0;
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memset( (char *)edits, 0, sizeof( *edits ) );
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while( *mods )
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{
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char *p;
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PATHPART *fp;
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switch( *mods++ )
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{
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case 'L': edits->downshift = 1; continue;
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case 'U': edits->upshift = 1; continue;
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case 'P': edits->parent = edits->filemods = 1; continue;
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case 'E': fp = &edits->empty; goto strval;
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case 'J': fp = &edits->join; goto strval;
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case 'G': fp = &edits->f.f_grist; goto fileval;
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case 'R': fp = &edits->f.f_root; goto fileval;
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case 'D': fp = &edits->f.f_dir; goto fileval;
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case 'B': fp = &edits->f.f_base; goto fileval;
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case 'S': fp = &edits->f.f_suffix; goto fileval;
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case 'M': fp = &edits->f.f_member; goto fileval;
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default: return; /* should complain, but so what... */
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}
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fileval:
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/* Handle :CHARS, where each char (without a following =) */
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/* selects a particular file path element. On the first such */
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/* char, we deselect all others (by setting ptr = "", len = 0) */
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/* and for each char we select that element (by setting ptr = 0) */
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edits->filemods = 1;
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if( *mods != '=' )
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{
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int i;
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if( !havezeroed++ )
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for( i = 0; i < 6; i++ )
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{
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edits->f.part[ i ].len = 0;
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edits->f.part[ i ].ptr = "";
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}
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fp->ptr = 0;
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continue;
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}
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strval:
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/* Handle :X=value, or :X */
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if( *mods != '=' )
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{
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fp->ptr = "";
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fp->len = 0;
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}
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else if( p = strchr( mods, MAGIC_COLON ) )
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{
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*p = 0;
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fp->ptr = ++mods;
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fp->len = p - mods;
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mods = p + 1;
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}
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else
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{
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fp->ptr = ++mods;
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fp->len = strlen( mods );
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mods += fp->len;
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}
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}
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}
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/*
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* var_edit_file() - copy input target name to output, modifying filename
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*/
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static void
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var_edit_file(
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const char *in,
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char *out,
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VAR_EDITS *edits )
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{
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PATHNAME pathname;
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/* Parse apart original filename, putting parts into "pathname" */
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path_parse( in, &pathname );
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/* Replace any pathname with edits->f */
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if( edits->f.f_grist.ptr )
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pathname.f_grist = edits->f.f_grist;
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if( edits->f.f_root.ptr )
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pathname.f_root = edits->f.f_root;
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if( edits->f.f_dir.ptr )
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pathname.f_dir = edits->f.f_dir;
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if( edits->f.f_base.ptr )
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pathname.f_base = edits->f.f_base;
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if( edits->f.f_suffix.ptr )
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pathname.f_suffix = edits->f.f_suffix;
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if( edits->f.f_member.ptr )
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pathname.f_member = edits->f.f_member;
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/* If requested, modify pathname to point to parent */
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if( edits->parent )
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path_parent( &pathname );
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/* Put filename back together */
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path_build( &pathname, out, 0 );
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}
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/*
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* var_edit_shift() - do upshift/downshift mods
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*/
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static void
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var_edit_shift(
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char *out,
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VAR_EDITS *edits )
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{
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/* Handle upshifting, downshifting now */
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if( edits->upshift )
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{
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for( ; *out; ++out )
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*out = toupper( *out );
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}
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else if( edits->downshift )
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{
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for( ; *out; ++out )
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*out = tolower( *out );
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}
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}
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