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test: Show a caret for errors

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test loves error messages like

test: Missing argument at index 2

without explaining where that "index 2" is.

So now, we print the arguments below that, with a caret pointing to
the place where the error occured.

For example:

    > test 1 = 2 and echo true or echo false
    test: Expected a combining operator like '-a' at index 3
    1 = 2 and echo true or echo false
          ^

    (Type 'help test' for related documentation)

Fixes #6030.
This commit is contained in:
Fabian Homborg 2020-05-28 21:20:30 +02:00
parent 971f108bda
commit 8a9e038b4e
1 changed files with 41 additions and 17 deletions
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58
src/builtin_test.cpp
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@ -182,9 +182,10 @@ class test_parser {
private:
wcstring_list_t strings;
wcstring_list_t errors;
int error_idx;
unique_ptr<expression> error(const wchar_t *fmt, ...);
void add_error(const wchar_t *fmt, ...);
unique_ptr<expression> error(unsigned int idx, const wchar_t *fmt, ...);
void add_error(unsigned int idx, const wchar_t *fmt, ...);
const wcstring &arg(unsigned int idx) { return strings.at(idx); }
@ -287,26 +288,32 @@ class parenthetical_expression : public expression {
bool evaluate(wcstring_list_t &errors) override;
};
void test_parser::add_error(const wchar_t *fmt, ...) {
void test_parser::add_error(unsigned int idx, const wchar_t *fmt, ...) {
assert(fmt != nullptr);
va_list va;
va_start(va, fmt);
this->errors.push_back(vformat_string(fmt, va));
va_end(va);
if (this->errors.size() == 1) {
this->error_idx = idx;
}
}
unique_ptr<expression> test_parser::error(const wchar_t *fmt, ...) {
unique_ptr<expression> test_parser::error(unsigned int idx, const wchar_t *fmt, ...) {
assert(fmt != nullptr);
va_list va;
va_start(va, fmt);
this->errors.push_back(vformat_string(fmt, va));
va_end(va);
if (this->errors.size() == 1) {
this->error_idx = idx;
}
return nullptr;
}
unique_ptr<expression> test_parser::parse_unary_expression(unsigned int start, unsigned int end) {
if (start >= end) {
return error(L"Missing argument at index %u", start);
return error(start, L"Missing argument at index %u", start);
}
token_t tok = token_for_string(arg(start))->tok;
if (tok == test_bang) {
@ -339,6 +346,7 @@ unique_ptr<expression> test_parser::parse_combining_expression(unsigned int star
this->errors.insert(
this->errors.begin(),
format_string(L"Expected a combining operator like '-a' at index %u", idx));
error_idx = idx;
break;
}
combiners.push_back(combiner);
@ -348,7 +356,7 @@ unique_ptr<expression> test_parser::parse_combining_expression(unsigned int star
// Parse another expression.
unique_ptr<expression> expr = parse_unary_expression(idx, end);
if (!expr) {
add_error(L"Missing argument at index %u", idx);
add_error(idx, L"Missing argument at index %u", idx);
if (!first) {
// Clean up the dangling combiner, since it never got its right hand expression.
combiners.pop_back();
@ -374,10 +382,10 @@ unique_ptr<expression> test_parser::parse_combining_expression(unsigned int star
unique_ptr<expression> test_parser::parse_unary_primary(unsigned int start, unsigned int end) {
// We need two arguments.
if (start >= end) {
return error(L"Missing argument at index %u", start);
return error(start, L"Missing argument at index %u", start);
}
if (start + 1 >= end) {
return error(L"Missing argument at index %u", start + 1);
return error(start + 1, L"Missing argument at index %u", start + 1);
}
// All our unary primaries are prefix, so the operator is at start.
@ -393,12 +401,12 @@ unique_ptr<expression> test_parser::parse_just_a_string(unsigned int start, unsi
// We need one argument.
if (start >= end) {
return error(L"Missing argument at index %u", start);
return error(start, L"Missing argument at index %u", start);
}
const token_info_t *info = token_for_string(arg(start));
if (info->tok != test_unknown) {
return error(L"Unexpected argument type at index %u", start);
return error(start, L"Unexpected argument type at index %u", start);
}
// This is hackish; a nicer way to implement this would be with a "just a string" expression
@ -410,7 +418,7 @@ unique_ptr<expression> test_parser::parse_binary_primary(unsigned int start, uns
// We need three arguments.
for (unsigned int idx = start; idx < start + 3; idx++) {
if (idx >= end) {
return error(L"Missing argument at index %u", idx);
return error(idx, L"Missing argument at index %u", idx);
}
}
@ -438,11 +446,11 @@ unique_ptr<expression> test_parser::parse_parenthentical(unsigned int start, uns
unsigned close_index = subexpr->range.end;
assert(close_index <= end);
if (close_index == end) {
return error(L"Missing close paren at index %u", close_index);
return error(close_index, L"Missing close paren at index %u", close_index);
}
const token_info_t *close_paren = token_for_string(arg(close_index));
if (close_paren->tok != test_paren_close) {
return error(L"Expected close paren at index %u", close_index);
return error(close_index, L"Expected close paren at index %u", close_index);
}
// Success.
@ -452,7 +460,7 @@ unique_ptr<expression> test_parser::parse_parenthentical(unsigned int start, uns
unique_ptr<expression> test_parser::parse_primary(unsigned int start, unsigned int end) {
if (start >= end) {
return error(L"Missing argument at index %u", start);
return error(start, L"Missing argument at index %u", start);
}
unique_ptr<expression> expr = nullptr;
@ -510,7 +518,7 @@ unique_ptr<expression> test_parser::parse_4_arg_expression(unsigned int start, u
unique_ptr<expression> test_parser::parse_expression(unsigned int start, unsigned int end) {
if (start >= end) {
return error(L"Missing argument at index %u", start);
return error(start, L"Missing argument at index %u", start);
}
unsigned int argc = end - start;
@ -519,7 +527,7 @@ unique_ptr<expression> test_parser::parse_expression(unsigned int start, unsigne
DIE("argc should not be zero"); // should have been caught by the above test
}
case 1: {
return error(L"Missing argument at index %u", start + 1);
return error(start + 1, L"Missing argument at index %u", start + 1);
}
case 2: {
return parse_unary_expression(start, end);
@ -548,10 +556,26 @@ unique_ptr<expression> test_parser::parse_args(const wcstring_list_t &args, wcst
// Handle errors.
// For now we only show the first error.
if (!parser.errors.empty()) {
int narg = 0;
int len_to_err = 0;
wcstring commandline;
for (auto arg: args) {
if (narg > 0) {
commandline.append(L" ");
}
commandline.append(arg);
narg++;
if (narg == parser.error_idx) {
len_to_err = fish_wcswidth(commandline.c_str(), commandline.length());
}
}
err.append(program_name);
err.append(L": ");
err.append(parser.errors.at(0));
err.push_back(L'\n');
err.append(commandline);
err.push_back(L'\n');
err.append(format_string(L"%*ls%ls\n", len_to_err + 1, L" ", L"^"));
}
if (result) {
@ -863,7 +887,7 @@ int builtin_test(parser_t &parser, io_streams_t &streams, wchar_t **argv) {
unique_ptr<expression> expr = test_parser::parse_args(args, err, program_name);
if (!expr) {
streams.err.append(err);
builtin_print_error_trailer(parser, streams.err, program_name);
streams.err.append(parser.current_line());
return STATUS_CMD_ERROR;
}