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Implemented index ranges for command substitution

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Now the following code works:
> echo (seq 10)[-1..1]
With output:
10
9
8
7
6
5
4
3
2
1
This commit is contained in:
maxfl 2012-07-07 22:01:28 +08:00
parent 41ec58a524
commit c0e996acf8
1 changed files with 13 additions and 12 deletions
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25
expand.cpp
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@ -727,10 +727,8 @@ void expand_variable_error( parser_t &parser, const wchar_t *token, int token_po
/**
Parse an array slicing specification
*/
static int parse_slice( const wchar_t *in, wchar_t **end_ptr, std::vector<long> &idx )
static int parse_slice( const wchar_t *in, wchar_t **end_ptr, std::vector<long> &idx, int size=-1 )
{
wchar_t *end;
int pos = 1;
@ -769,9 +767,17 @@ static int parse_slice( const wchar_t *in, wchar_t **end_ptr, std::vector<long>
}
pos = end-in;
// debug( 0, L"Push range idx %d %d", tmp, tmp1 );
idx.push_back(tmp);
// idx.push_back(tmp2);
if ( size>-1 ) {
// debug( 0, L"Push range idx %d %d", tmp, tmp1 );
long i1 = tmp>-1 ? tmp : size+tmp+1;
long i2 = tmp1>-1 ? tmp1 : size+tmp1+1;
// debug( 0, L"Push range idx %d %d", i1, i2 );
short direction = i2<i1 ? -1 : 1 ;
for (long jjj = i1; jjj*direction <= i2*direction; jjj+=direction) {
// debug(0, L"Expand range [subst]: %i\n", jjj);
idx.push_back( jjj );
}
}
continue;
}
@ -1204,7 +1210,7 @@ static int expand_cmdsubst( parser_t &parser, const wcstring &input, std::vector
std::vector<long> slice_idx;
wchar_t *slice_end;
if( parse_slice( tail_begin, &slice_end, slice_idx ) )
if( parse_slice( tail_begin, &slice_end, slice_idx, sub_res.size() ) )
{
parser.error( SYNTAX_ERROR, -1, L"Invalid index value" );
return 0;
@ -1216,11 +1222,6 @@ static int expand_cmdsubst( parser_t &parser, const wcstring &input, std::vector
for( i=0; i < slice_idx.size(); i++ )
{
long idx = slice_idx.at(i);
if( idx < 0 )
{
idx = sub_res.size() + idx + 1;
}
if( idx < 1 || (size_t)idx > sub_res.size() )
{
parser.error( SYNTAX_ERROR, -1, L"Invalid index value" );