182 lines
3.9 KiB
Awk
182 lines
3.9 KiB
Awk
#!/usr/bin/env awk
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function shift( array, \
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junk, elm0, l )
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{
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elm0 = array[0]
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for ( l = 0; l < asorti( array, junk ) - 1; l++ )
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array[l] = array[l+1];
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delete array[l]
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return elm0
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}
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function init_cpp_src_line()
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{
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logical_line = ""
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delete break_pos
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}
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function shift_valid_bp( array, \
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junk, elm )
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{
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elm = -1
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if ( 0 < asorti( array, junk ) )
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do {
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elm = shift( array )
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} while ( 0 > elm );
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return elm
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}
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function check_cpp_src_line_break_pos( \
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i, junk )
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{
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printf( "break_pos:" )
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for ( i = 0; i < asorti( break_pos, junk ); i++ )
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printf( " %d", break_pos[i] );
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printf( "\n" )
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}
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function check_cpp_src_line()
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{
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printf( "logical_line[%s]\n", logical_line )
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check_cpp_src_line_break_pos()
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}
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function append_line( phys_line, \
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filt_line, bp_len )
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{
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filt_line = phys_line
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sub( /\\$/, " ", filt_line )
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logical_line = logical_line filt_line
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bp_len = asorti( break_pos, junk )
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break_pos[bp_len] = length( logical_line ) - 1
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}
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function print_line( \
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c0, c1, i, junk, part_str )
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{
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c0 = 0
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while( asorti( break_pos, junk ) > 1 )
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{
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if ( ( c1 = shift_valid_bp( break_pos ) ) < 1 )
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{
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part_str = substr( logical_line, c0 + 1 )
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printf( "%s\n", part_str )
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return
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}
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part_str = substr( logical_line, c0 + 1, c1 - c0 + 1 )
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gsub( / $/, "\\", part_str )
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printf( "%s\n", part_str )
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c0 = c1 + 1
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}
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part_str = substr( logical_line, c0 + 1 )
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printf( "%s\n", part_str )
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}
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function shrink_spaces( pos, \
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tail, removed_length, k )
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{
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tail = substr( logical_line, pos )
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sub( /^[ \t]+/, " ", tail )
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removed_length = length( logical_line ) - pos - length( tail ) + 1
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logical_line = substr( logical_line, 0, pos - 1 ) tail
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for ( k = 0; k < asorti( break_pos, junk ); k++ )
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if ( ( pos + removed_length ) <= break_pos[k] )
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break_pos[k] = break_pos[k] - removed_length;
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else if ( pos <= break_pos[k] )
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break_pos[k] = -1;
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return removed_length
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}
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function shrink_spaces_to_linebreak( pos, \
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junk, part_str, removed_length, i )
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{
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for ( i = 0; i < asorti( break_pos, junk ) && break_pos[i] < pos ; i++ )
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;
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if ( break_pos[i] < 1 )
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return;
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part_str = substr( logical_line, pos, break_pos[i] - pos + 1 )
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sub( /^[ \t]+/, " ", part_str )
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removed_length = ( break_pos[i] - pos + 1 ) - length( part_str )
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tail = substr( logical_line, pos + removed_length )
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logical_line = substr( logical_line, 0, pos - 1 ) tail
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for ( ; i < asorti( break_pos, junk ); i++ )
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break_pos[i] -= removed_length;
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return removed_length
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}
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function delete_linebreaks_in_2nd_token( \
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tail, paren_depth, junk, i, j, k, l )
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{
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if ( logical_line ~ /^[ \t]*#[ \t]*define[ \t]+[0-9A-Za-z_]+\(/ )
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{
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tail = logical_line
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sub( /^[ \t]*#[ \t]*define[ \t]+[0-9A-Za-z_]+/, "", tail )
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paren_depth = 0
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l = 0
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i = length( logical_line ) - length( tail ) + 1 # seek to the 1st op paren
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j = i
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do {
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if ( substr( logical_line, j, 2 ) ~ /[ \t][ \t]/ )
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l = shrink_spaces( j );
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else if ( substr( logical_line, j, 1 ) == "(" )
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paren_depth += 1;
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else if ( substr( logical_line, j, 1 ) == ")" )
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paren_depth -= 1;
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j += 1
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} while ( j < length( logical_line ) && paren_depth != 0 )
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for ( k = 0; k < asorti( break_pos, junk ); k++ )
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if ( i <= break_pos[k] && break_pos[k] < j )
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break_pos[k] = -1;
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if ( l > 0 )
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shrink_spaces_to_linebreak( j );
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}
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}
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BEGIN{
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init_cpp_src_line()
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}
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{
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append_line( $0 )
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if ( $0 !~ /\\$/ )
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{
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delete_linebreaks_in_2nd_token()
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print_line()
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init_cpp_src_line()
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}
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}
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END{
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if ( 0 < length( logical_line ) )
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{
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delete_linebreaks_in_2nd_token()
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print_line()
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}
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}
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