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#include <defs.h>
#include <mcpp-expr.h>
/*
* The front end keeps the already established mcpu-cpp preprocessing order:
* handle the special defined operator first, expand macros second, then pass
* the resulting UCS-2 expression to the ZUBR parser generated from
* mcpp-expr.zubr.
*/
static int
expr_identifier_start( __mpu_char16_t c )
{
return( mcpu_pp_is_identifier_start(c) );
}
static int
expr_identifier_char( __mpu_char16_t c )
{
return( mcpu_pp_is_identifier_char(c) );
}
static int
expr_space( __mpu_char16_t c )
{
return( c == ' ' || c == '\t' || c == '\r' || c == '\n' ||
c == '\f' || c == '\v' );
}
static int
append_defined_value( mcpu_macro_table *macros,
const __mpu_char16_t *text, size_t length,
size_t *pos, mcpu_text *output,
const char *filename, unsigned line_number )
{
size_t p = *pos;
size_t start;
size_t end;
int parenthesized = 0;
while( p < length && expr_space(text[p]) ) ++p;
if( p < length && text[p] == '(' )
{
parenthesized = 1;
++p;
while( p < length && expr_space(text[p]) ) ++p;
}
if( p >= length || !expr_identifier_start(text[p]) )
{
fprintf( stderr, "%s:%u: error: identifier expected after defined\n",
filename, line_number );
return( -1 );
}
start = p++;
while( p < length && expr_identifier_char(text[p]) ) ++p;
end = p;
while( p < length && expr_space(text[p]) ) ++p;
if( parenthesized )
{
if( p >= length || text[p] != ')' )
{
fprintf( stderr, "%s:%u: error: missing ')' after defined\n",
filename, line_number );
return( -1 );
}
++p;
}
if( mcpu_text_append_ascii(
output, mcpu_macro_find(macros, text + start, end - start) ? "1" : "0") != 0 )
return( -1 );
*pos = p;
return( 0 );
}
static int
replace_defined_operators( mcpu_macro_table *macros,
const __mpu_char16_t *text, size_t length,
mcpu_text *output,
const char *filename, unsigned line_number )
{
size_t p = 0;
__mpu_char16_t quote = 0;
int escaped = 0;
mcpu_text_free( output );
mcpu_text_init( output );
while( p < length )
{
__mpu_char16_t c = text[p];
if( quote )
{
if( mcpu_text_append_char(output, c) != 0 ) return( -1 );
if( escaped )
escaped = 0;
else if( c == '\\' )
escaped = 1;
else if( c == quote )
quote = 0;
++p;
continue;
}
if( c == '\'' || c == '"' )
{
quote = c;
if( mcpu_text_append_char(output, c) != 0 ) return( -1 );
++p;
continue;
}
if( expr_identifier_start(c) )
{
size_t start = p++;
while( p < length && expr_identifier_char(text[p]) ) ++p;
if( p - start == 7 &&
mcpu_text_equal_ascii(text + start, p - start, "defined") )
{
if( append_defined_value(macros, text, length, &p, output,
filename, line_number) != 0 )
return( -1 );
}
else if( mcpu_text_append(output, text + start, p - start) != 0 )
return( -1 );
continue;
}
if( mcpu_text_append_char(output, c) != 0 )
return( -1 );
++p;
}
return( 0 );
}
int
mcpp_eval_if_expression( mcpu_macro_table *macros,
const __mpu_char16_t *text, size_t length,
enum mcpu_language language,
const mcpu_macro_expansion_context *context,
const char *filename, unsigned line_number,
int *result )
{
mcpu_text defined;
mcpu_text expanded;
int rc = -1;
if( macros == NULL || text == NULL || context == NULL ||
filename == NULL || result == NULL )
{
errno = EINVAL;
return( -1 );
}
mcpu_text_init( &defined );
mcpu_text_init( &expanded );
if( replace_defined_operators(macros, text, length, &defined,
filename, line_number) != 0 ||
mcpu_macro_expand(macros, defined.data, defined.length,
language, context, &expanded) != 0 )
goto done;
rc = mcpp_expr_parse( expanded.data, expanded.length,
filename, line_number, context->options, result );
done:
mcpu_text_free( &defined );
mcpu_text_free( &expanded );
return( rc );
}
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