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Improvements to error messages with new parser. In particular, "naked

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builtins" now print their help (e.g. just 'while')
This commit is contained in:
ridiculousfish
2014-01-12 15:10:59 -08:00
parent 40e223c12d
commit ec469782c8
2 changed files with 69 additions and 52 deletions
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81
parse_tree.cpp
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@@ -240,6 +240,39 @@ wcstring keyword_description(parse_keyword_t k)
return format_string(L"Unknown keyword type %ld", static_cast<long>(k));
}
static wcstring token_type_user_presentable_description(parse_token_type_t type, parse_keyword_t keyword)
{
if (keyword != parse_keyword_none)
{
return format_string(L"keyword '%ls'", keyword_description(keyword).c_str());
}
switch (type)
{
/* Hackish. We only support the following types. */
case symbol_statement:
return L"a command";
case parse_token_type_string:
return L"a string";
case parse_token_type_pipe:
return L"a pipe";
case parse_token_type_redirection:
return L"a redirection";
case parse_token_type_background:
return L"a '&'";
case parse_token_type_end:
return L"end of the statement";
default:
return format_string(L"a %ls", token_type_description(type).c_str());
}
}
/** Returns a string description of the given parse node */
wcstring parse_node_t::describe(void) const
{
@@ -263,32 +296,7 @@ wcstring parse_token_t::describe() const
/** A string description appropriate for presentation to the user */
wcstring parse_token_t::user_presentable_description() const
{
if (keyword != parse_keyword_none)
{
return format_string(L"keyword %ls", keyword_description(keyword).c_str());
}
switch (type)
{
/* Hackish. We only support the */
case parse_token_type_string:
return L"a string";
case parse_token_type_pipe:
return L"a pipe";
case parse_token_type_redirection:
return L"a redirection";
case parse_token_type_background:
return L"a '&'";
case parse_token_type_end:
return L"statement terminator";
default:
return format_string(L"a %ls", this->describe().c_str());
}
return token_type_user_presentable_description(type, keyword);
}
/* Convert from tokenizer_t's token type to a parse_token_t type */
@@ -443,20 +451,7 @@ struct parse_stack_element_t
/* Returns a name that we can show to the user, e.g. "a command" */
wcstring user_presentable_description(void) const
{
if (keyword != parse_keyword_none)
{
return format_string(L"keyword %ls", keyword_description(keyword).c_str());
}
switch (type)
{
/* Hackish, the only one we support now */
case symbol_statement:
return L"a command";
default:
return format_string(L"a %ls", this->describe().c_str());
}
return token_type_user_presentable_description(type, keyword);
}
};
@@ -751,7 +746,8 @@ void parse_ll_t::parse_error_unbalancing_token(parse_token_t token)
// This is a 'generic' parse error when we can't match the top of the stack element
void parse_ll_t::parse_error_failed_production(struct parse_stack_element_t &stack_elem, parse_token_t token)
{
this->parse_error(token, parse_error_generic, L"Expected %ls, but instead found %ls", stack_elem.user_presentable_description().c_str(), token.user_presentable_description().c_str());
const wcstring expected = stack_elem.user_presentable_description();
this->parse_error(expected.c_str(), token);
}
void parse_ll_t::report_tokenizer_error(parse_token_t token, const wchar_t *tok_error)
@@ -765,8 +761,7 @@ void parse_ll_t::parse_error(const wchar_t *expected, parse_token_t token)
fatal_errored = true;
if (this->should_generate_error_messages)
{
wcstring desc = token.user_presentable_description();
this->parse_error(token, parse_error_generic, L"Expected a %ls, instead got a token of type %ls", expected, desc.c_str());
this->parse_error(token, parse_error_generic, L"Expected %ls, but instead found %ls", expected, token.user_presentable_description().c_str());
}
}