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builtin string: push_back \n chars rather than append strings

Browse source 
prefer
    streams.out.append(foo)
    streams.out.push_back(L'\n')

vs e.g.
    foo.append(L"\n");
    streams.out.append(foo)
This commit is contained in:
Aaron Gyes 2022-11-07 13:13:57 -08:00
parent 33edac2c0c
commit 3739c53bcf
1 changed files with 43 additions and 38 deletions
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81
src/builtins/string.cpp
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@ -711,12 +711,11 @@ static int string_escape(parser_t &parser, io_streams_t &streams, int argc, cons
flags |= ESCAPE_NO_QUOTED;
}
int nesc = 0;
int nesc;
arg_iterator_t aiter(argv, optind, streams);
while (const wcstring *arg = aiter.nextstr()) {
wcstring sep = aiter.want_newline() ? L"\n" : L"";
streams.out.append(escape_string(*arg, flags, opts.escape_style) + sep);
nesc++;
for (nesc = 0; const wcstring *arg = aiter.nextstr(); nesc++) {
streams.out.append(escape_string(*arg, flags, opts.escape_style));
if (aiter.want_newline()) streams.out.push_back(L'\n');
}
return nesc > 0 ? STATUS_CMD_OK : STATUS_CMD_ERROR;
@ -738,9 +737,9 @@ static int string_unescape(parser_t &parser, io_streams_t &streams, int argc,
arg_iterator_t aiter(argv, optind, streams);
while (const wcstring *arg = aiter.nextstr()) {
wcstring result;
wcstring sep = aiter.want_newline() ? L"\n" : L"";
if (unescape_string(*arg, &result, flags, opts.escape_style)) {
streams.out.append(result + sep);
streams.out.append(result);
if (aiter.want_newline()) streams.out.push_back(L'\n');
nesc++;
}
}
@ -818,7 +817,8 @@ static int string_length(parser_t &parser, io_streams_t &streams, int argc, cons
nnonempty++;
}
if (!opts.quiet) {
streams.out.append(to_string(max) + L"\n");
streams.out.append(to_string(max));
streams.out.push_back(L'\n');
} else if (nnonempty > 0) {
return STATUS_CMD_OK;
}
@ -829,7 +829,8 @@ static int string_length(parser_t &parser, io_streams_t &streams, int argc, cons
nnonempty++;
}
if (!opts.quiet) {
streams.out.append(to_string(n) + L"\n");
streams.out.append(to_string(n));
streams.out.push_back(L'\n');
} else if (nnonempty > 0) {
return STATUS_CMD_OK;
}
@ -895,7 +896,8 @@ class wildcard_matcher_t final : public string_matcher_t {
if (opts.index) {
streams.out.append_format(L"1 %lu\n", arg.length());
} else {
streams.out.append(arg + L"\n");
streams.out.append(arg);
streams.out.push_back(L'\n');
}
}
}
@ -976,10 +978,11 @@ class regex_matcher_t final : public string_matcher_t {
if (!mrange.has_value()) {
if (opts.invert_match && !opts.quiet) {
if (opts.index) {
streams.out.append_format(L"1 %lu\n", arg.length());
streams.out.append_format(L"1 %lu", arg.length());
} else {
streams.out.append(arg + L"\n");
streams.out.append(arg);
}
streams.out.push_back(L'\n');
}
return opts.invert_match ? match_result_t::match : match_result_t::no_match;
@ -988,7 +991,8 @@ class regex_matcher_t final : public string_matcher_t {
}
if (opts.entire && !opts.quiet) {
streams.out.append(arg + L"\n");
streams.out.append(arg);
streams.out.push_back(L'\n');
}
// If we have groups-only, we skip the first match, which is the full one.
@ -997,10 +1001,11 @@ class regex_matcher_t final : public string_matcher_t {
maybe_t<match_range_t> cg = this->regex_.group(match_data_, j);
if (cg.has_value() && !opts.quiet) {
if (opts.index) {
streams.out.append_format(L"%lu %lu\n", cg->begin + 1, cg->end - cg->begin);
streams.out.append_format(L"%lu %lu", cg->begin + 1, cg->end - cg->begin);
} else {
streams.out.append(arg.substr(cg->begin, cg->end - cg->begin) + L"\n");
streams.out.append(arg.substr(cg->begin, cg->end - cg->begin));
}
streams.out.push_back(L'\n');
}
}
@ -1168,10 +1173,8 @@ static int string_pad(parser_t &parser, io_streams_t &streams, int argc, const w
padded.append(pad, opts.char_to_pad);
}
}
if (aiter_width.want_newline()) {
padded.push_back(L'\n');
}
streams.out.append(padded);
if (aiter_width.want_newline()) streams.out.push_back(L'\n');
}
return STATUS_CMD_OK;
@ -1278,8 +1281,8 @@ bool literal_replacer_t::replace_matches(const wcstring &arg, bool want_newline)
}
if (!opts.quiet && (!opts.filter || replacement_occurred)) {
wcstring sep = want_newline ? L"\n" : L"";
streams.out.append(result + sep);
streams.out.append(result);
if (want_newline) streams.out.push_back(L'\n');
}
return true;
@ -1306,8 +1309,8 @@ bool regex_replacer_t::replace_matches(const wcstring &arg, bool want_newline) {
} else {
bool replacement_occurred = repl_count > 0;
if (!opts.quiet && (!opts.filter || replacement_occurred)) {
wcstring sep = want_newline ? L"\n" : L"";
streams.out.append(*result + sep);
streams.out.append(*result);
if (want_newline) streams.out.push_back(L'\n');
}
total_replaced += repl_count;
}
@ -1515,7 +1518,7 @@ static int string_repeat(parser_t &parser, io_streams_t &streams, int argc, cons
}
if (!first && !opts.quiet) {
streams.out.append(L'\n');
streams.out.push_back(L'\n');
}
first = false;
@ -1574,7 +1577,7 @@ static int string_repeat(parser_t &parser, io_streams_t &streams, int argc, cons
// Historical behavior is to never append a newline if all strings were empty.
if (!opts.quiet && !opts.no_newline && !all_empty && aiter.want_newline()) {
streams.out.append(L'\n');
streams.out.push_back(L'\n');
}
return all_empty ? STATUS_CMD_ERROR : STATUS_CMD_OK;
@ -1605,7 +1608,6 @@ static int string_sub(parser_t &parser, io_streams_t &streams, int argc, const w
using size_type = wcstring::size_type;
size_type pos = 0;
size_type count = wcstring::npos;
wcstring sep = aiter.want_newline() ? L"\n" : L"";
if (opts.start > 0) {
pos = static_cast<size_type>(opts.start - 1);
@ -1635,7 +1637,8 @@ static int string_sub(parser_t &parser, io_streams_t &streams, int argc, const w
// Note that std::string permits count to extend past end of string.
if (!opts.quiet) {
streams.out.append(s->substr(pos, count) + sep);
streams.out.append(s->substr(pos, count));
if (aiter.want_newline()) streams.out.push_back(L'\n');
}
nsub++;
if (opts.quiet) return STATUS_CMD_OK;
@ -1676,7 +1679,8 @@ static int string_shorten(parser_t &parser, io_streams_t &streams, int argc, con
// echo whatever
// end
while (const wcstring *arg = aiter_width.nextstr()) {
streams.out.append(*arg + L"\n");
streams.out.append(*arg);
streams.out.push_back(L'\n');
}
return STATUS_CMD_ERROR;
}
@ -1761,12 +1765,14 @@ static int string_shorten(parser_t &parser, io_streams_t &streams, int argc, con
}
if (pos == 0) {
streams.out.append(line + L"\n");
streams.out.append(line);
streams.out.push_back(L'\n');
} else {
// We have an ellipsis, construct our string and print it.
nsub++;
out = ell + out + L'\n';
out = ell + out;
streams.out.append(out);
streams.out.push_back(L'\n');
}
continue;
} else {
@ -1804,13 +1810,12 @@ static int string_shorten(parser_t &parser, io_streams_t &streams, int argc, con
}
if (pos == line.size()) {
streams.out.append(line + L"\n");
streams.out.append(line);
streams.out.push_back(L'\n');
} else {
nsub++;
wcstring newl = line.substr(0, pos);
newl.append(ell);
newl.push_back(L'\n');
streams.out.append(newl);
streams.out.append(wcstring(line.substr(0, pos) + ell));
streams.out.push_back(L'\n');
}
}
@ -1837,7 +1842,6 @@ static int string_trim(parser_t &parser, io_streams_t &streams, int argc, const
arg_iterator_t aiter(argv, optind, streams);
while (const wcstring *arg = aiter.nextstr()) {
wcstring sep = aiter.want_newline() ? L"\n" : L"";
// Begin and end are respectively the first character to keep on the left, and first
// character to trim on the right. The length is thus end - start.
size_t begin = 0, end = arg->size();
@ -1852,7 +1856,8 @@ static int string_trim(parser_t &parser, io_streams_t &streams, int argc, const
assert(begin <= end && end <= arg->size());
ntrim += arg->size() - (end - begin);
if (!opts.quiet) {
streams.out.append(wcstring(*arg, begin, end - begin) + sep);
streams.out.append(wcstring(*arg, begin, end - begin));
if (aiter.want_newline()) streams.out.push_back(L'\n');
} else if (ntrim > 0) {
return STATUS_CMD_OK;
}
@ -1877,8 +1882,8 @@ static int string_transform(parser_t &parser, io_streams_t &streams, int argc, c
std::transform(transformed.begin(), transformed.end(), transformed.begin(), func);
if (transformed != *arg) n_transformed++;
if (!opts.quiet) {
wcstring sep = aiter.want_newline() ? L"\n" : L"";
streams.out.append(transformed + sep);
streams.out.append(transformed);
if (aiter.want_newline()) streams.out.push_back(L'\n');
} else if (n_transformed > 0) {
return STATUS_CMD_OK;
}