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detect syntax_error; appending array-of-tables

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toml file like the following is explicitly prohibited.
a = [{b = 1}]
[[a]]
b = 2
this commit detects this kind of syntax-error while parsing toml file
This commit is contained in:
ToruNiina 2018-12-22 17:07:06 +09:00
parent fec49aaaa3
commit c63ac7e435
1 changed files with 25 additions and 0 deletions
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25
toml/parser.hpp
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@ -1050,6 +1050,31 @@ insert_nested_key(table& root, const toml::value& v,
" value already exists"), get_region(v),
"while inserting this array-of-tables"));
}
// avoid conflicting array of table like the following.
// ```toml
// a = [{b = 42}] # define a as an array of *inline* tables
// [[a]] # a is an array of *multi-line* tables
// b = 54
// ```
// Here, from the type information, these cannot be detected
// bacause inline table is also a table.
// But toml v0.5.0 explicitly says it is invalid. The above
// array-of-tables has a static size and appending to the
// array is invalid.
// In this library, multi-line table value has a region
// that points to the key of the table (e.g. [[a]]). By
// comparing the first two letters in key, we can detect
// the array-of-table is inline or multiline.
if(detail::get_region(a.front()).str().substr(0,2) != "[[")
{
throw syntax_error(format_underline(concat_to_string(
"[error] toml::insert_value: array of table (\"",
format_dotted_keys(first, last), "\") collides with"
" existing array-of-tables"), get_region(tab->at(k)),
concat_to_string("this ", tab->at(k).type(),
" value has static size"), get_region(v),
"appending this to the statically sized array"));
}
a.push_back(v);
return ok(true);
}