Merge pull request #2212 from nlohmann/comments
Add option to ignore comments in parse/accept functions
This commit is contained in:
Niels Lohmann
GitHub
commit
3948b5b091
7 changed files with 416 additions and 66 deletions
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@ -1508,7 +1508,7 @@ The library supports **Unicode input** as follows:
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### Comments in JSON
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This library does not support comments. It does so for three reasons:
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This library does not support comments by default. It does so for three reasons:
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1. Comments are not part of the [JSON specification](https://tools.ietf.org/html/rfc8259). You may argue that `//` or `/* */` are allowed in JavaScript, but JSON is not JavaScript.
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2. This was not an oversight: Douglas Crockford [wrote on this](https://plus.google.com/118095276221607585885/posts/RK8qyGVaGSr) in May 2012:
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@ -1519,11 +1519,7 @@ This library does not support comments. It does so for three reasons:
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3. It is dangerous for interoperability if some libraries would add comment support while others don't. Please check [The Harmful Consequences of the Robustness Principle](https://tools.ietf.org/html/draft-iab-protocol-maintenance-01) on this.
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This library will not support comments in the future. If you wish to use comments, I see three options:
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1. Strip comments before using this library.
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2. Use a different JSON library with comment support.
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3. Use a format that natively supports comments (e.g., YAML or JSON5).
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However, you can pass set parameter `ignore_comments` to true in the `parse` function to ignore `//` or `/* */` comments. Comments will then be treated as whitespace.
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### Order of object keys
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@ -112,8 +112,11 @@ class lexer : public lexer_base<BasicJsonType>
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public:
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using token_type = typename lexer_base<BasicJsonType>::token_type;
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explicit lexer(InputAdapterType&& adapter)
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: ia(std::move(adapter)), decimal_point_char(static_cast<char_int_type>(get_decimal_point())) {}
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explicit lexer(InputAdapterType&& adapter, bool ignore_comments_ = false)
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: ia(std::move(adapter))
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, ignore_comments(ignore_comments_)
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, decimal_point_char(static_cast<char_int_type>(get_decimal_point()))
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{}
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// delete because of pointer members
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lexer(const lexer&) = delete;
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@ -826,6 +829,77 @@ class lexer : public lexer_base<BasicJsonType>
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}
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}
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/*!
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* @brief scan a comment
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* @return whether comment could be scanned successfully
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*/
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bool scan_comment()
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{
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switch (get())
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{
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// single-line comments skip input until a newline or EOF is read
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case '/':
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{
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while (true)
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{
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switch (get())
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{
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case '\n':
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case '\r':
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case std::char_traits<char_type>::eof():
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case '\0':
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return true;
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default:
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break;
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}
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}
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}
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// multi-line comments skip input until */ is read
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case '*':
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{
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while (true)
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{
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switch (get())
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{
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case std::char_traits<char_type>::eof():
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case '\0':
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{
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error_message = "invalid comment; missing closing '*/'";
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return false;
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}
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case '*':
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{
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switch (get())
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{
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case '/':
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return true;
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default:
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{
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unget();
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break;
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}
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}
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}
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default:
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break;
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}
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}
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}
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// unexpected character after reading '/'
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default:
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{
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error_message = "invalid comment; expecting '/' or '*' after '/'";
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return false;
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}
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}
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}
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JSON_HEDLEY_NON_NULL(2)
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static void strtof(float& f, const char* str, char** endptr) noexcept
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{
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@ -1415,6 +1489,15 @@ scan_number_done:
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return true;
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}
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void skip_whitespace()
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{
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do
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{
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get();
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}
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while (current == ' ' or current == '\t' or current == '\n' or current == '\r');
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}
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token_type scan()
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{
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// initially, skip the BOM
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@ -1425,11 +1508,19 @@ scan_number_done:
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}
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// read next character and ignore whitespace
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do
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skip_whitespace();
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// ignore comments
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if (ignore_comments and current == '/')
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{
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get();
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if (not scan_comment())
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{
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return token_type::parse_error;
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}
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// skip following whitespace
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skip_whitespace();
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}
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while (current == ' ' or current == '\t' or current == '\n' or current == '\r');
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switch (current)
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{
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@ -1499,6 +1590,9 @@ scan_number_done:
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/// input adapter
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InputAdapterType ia;
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/// whether comments should be ignored (true) or signaled as errors (false)
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const bool ignore_comments = false;
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/// the current character
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char_int_type current = std::char_traits<char_type>::eof();
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@ -63,8 +63,11 @@ class parser
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/// a parser reading from an input adapter
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explicit parser(InputAdapterType&& adapter,
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const parser_callback_t<BasicJsonType> cb = nullptr,
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const bool allow_exceptions_ = true)
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: callback(cb), m_lexer(std::move(adapter)), allow_exceptions(allow_exceptions_)
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const bool allow_exceptions_ = true,
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const bool skip_comments = false)
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: callback(cb)
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, m_lexer(std::move(adapter), skip_comments)
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, allow_exceptions(allow_exceptions_)
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{
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// read first token
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get_token();
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@ -196,10 +196,12 @@ class basic_json
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static ::nlohmann::detail::parser<basic_json, InputAdapterType> parser(
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InputAdapterType adapter,
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detail::parser_callback_t<basic_json>cb = nullptr,
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bool allow_exceptions = true
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const bool allow_exceptions = true,
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const bool ignore_comments = false
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)
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{
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return ::nlohmann::detail::parser<basic_json, InputAdapterType>(std::move(adapter), std::move(cb), allow_exceptions);
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return ::nlohmann::detail::parser<basic_json, InputAdapterType>(std::move(adapter),
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std::move(cb), allow_exceptions, ignore_comments);
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}
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using primitive_iterator_t = ::nlohmann::detail::primitive_iterator_t;
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@ -6591,6 +6593,9 @@ class basic_json
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(optional)
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@param[in] allow_exceptions whether to throw exceptions in case of a
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parse error (optional, true by default)
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@param[in] ignore_comments whether comments should be ignored and treated
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like whitespace (true) or yield a parse error (true); (optional, false by
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default)
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@return deserialized JSON value; in case of a parse error and
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@a allow_exceptions set to `false`, the return value will be
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@ -6619,16 +6624,18 @@ class basic_json
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@liveexample{The example below demonstrates the `parse()` function reading
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from a contiguous container.,parse__contiguouscontainer__parser_callback_t}
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@since version 2.0.3 (contiguous containers)
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@since version 2.0.3 (contiguous containers); version 3.9.0 allowed to
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ignore comments.
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*/
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template<typename InputType>
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JSON_HEDLEY_WARN_UNUSED_RESULT
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static basic_json parse(InputType&& i,
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const parser_callback_t cb = nullptr,
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const bool allow_exceptions = true)
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const bool allow_exceptions = true,
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const bool ignore_comments = false)
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{
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basic_json result;
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parser(detail::input_adapter(std::forward<InputType>(i)), cb, allow_exceptions).parse(true, result);
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parser(detail::input_adapter(std::forward<InputType>(i)), cb, allow_exceptions, ignore_comments).parse(true, result);
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return result;
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}
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@ -6645,6 +6652,9 @@ class basic_json
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(optional)
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@param[in] allow_exceptions whether to throw exceptions in case of a
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parse error (optional, true by default)
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@param[in] ignore_comments whether comments should be ignored and treated
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like whitespace (true) or yield a parse error (true); (optional, false by
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default)
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@return deserialized JSON value; in case of a parse error and
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@a allow_exceptions set to `false`, the return value will be
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@ -6660,10 +6670,11 @@ class basic_json
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static basic_json parse(IteratorType first,
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IteratorType last,
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const parser_callback_t cb = nullptr,
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const bool allow_exceptions = true)
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const bool allow_exceptions = true,
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const bool ignore_comments = false)
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{
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basic_json result;
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parser(detail::input_adapter(std::move(first), std::move(last)), cb, allow_exceptions).parse(true, result);
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parser(detail::input_adapter(std::move(first), std::move(last)), cb, allow_exceptions, ignore_comments).parse(true, result);
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return result;
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}
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@ -6671,10 +6682,11 @@ class basic_json
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JSON_HEDLEY_DEPRECATED_FOR(3.8.0, parse(ptr, ptr + len))
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static basic_json parse(detail::span_input_adapter&& i,
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const parser_callback_t cb = nullptr,
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const bool allow_exceptions = true)
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const bool allow_exceptions = true,
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const bool ignore_comments = false)
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{
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basic_json result;
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parser(i.get(), cb, allow_exceptions).parse(true, result);
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parser(i.get(), cb, allow_exceptions, ignore_comments).parse(true, result);
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return result;
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}
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@ -6694,6 +6706,9 @@ class basic_json
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iterators.
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@param[in] i input to read from
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@param[in] ignore_comments whether comments should be ignored and treated
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like whitespace (true) or yield a parse error (true); (optional, false by
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default)
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@return Whether the input read from @a i is valid JSON.
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@ -6706,22 +6721,25 @@ class basic_json
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from a string.,accept__string}
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*/
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template<typename InputType>
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static bool accept(InputType&& i)
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static bool accept(InputType&& i,
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const bool ignore_comments = false)
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{
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return parser(detail::input_adapter(std::forward<InputType>(i))).accept(true);
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return parser(detail::input_adapter(std::forward<InputType>(i)), nullptr, false, ignore_comments).accept(true);
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}
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template<typename IteratorType>
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static bool accept(IteratorType first, IteratorType last)
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static bool accept(IteratorType first, IteratorType last,
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const bool ignore_comments = false)
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{
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return parser(detail::input_adapter(std::move(first), std::move(last))).accept(true);
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return parser(detail::input_adapter(std::move(first), std::move(last)), nullptr, false, ignore_comments).accept(true);
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}
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JSON_HEDLEY_WARN_UNUSED_RESULT
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JSON_HEDLEY_DEPRECATED_FOR(3.8.0, accept(ptr, ptr + len))
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static bool accept(detail::span_input_adapter&& i)
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static bool accept(detail::span_input_adapter&& i,
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const bool ignore_comments = false)
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{
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return parser(i.get()).accept(true);
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return parser(i.get(), nullptr, false, ignore_comments).accept(true);
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}
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/*!
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@ -6741,6 +6759,9 @@ class basic_json
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@param[in,out] sax SAX event listener
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@param[in] format the format to parse (JSON, CBOR, MessagePack, or UBJSON)
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@param[in] strict whether the input has to be consumed completely
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@param[in] ignore_comments whether comments should be ignored and treated
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like whitespace (true) or yield a parse error (true); (optional, false by
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default); only applies to the JSON file format.
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@return return value of the last processed SAX event
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@ -6765,11 +6786,12 @@ class basic_json
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JSON_HEDLEY_NON_NULL(2)
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static bool sax_parse(InputType&& i, SAX* sax,
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input_format_t format = input_format_t::json,
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const bool strict = true)
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const bool strict = true,
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const bool ignore_comments = false)
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{
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auto ia = detail::input_adapter(std::forward<InputType>(i));
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return format == input_format_t::json
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? parser(std::move(ia)).sax_parse(sax, strict)
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? parser(std::move(ia), nullptr, true, ignore_comments).sax_parse(sax, strict)
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: detail::binary_reader<basic_json, decltype(ia), SAX>(std::move(ia)).sax_parse(format, sax, strict);
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}
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@ -6777,11 +6799,12 @@ class basic_json
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JSON_HEDLEY_NON_NULL(3)
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static bool sax_parse(IteratorType first, IteratorType last, SAX* sax,
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input_format_t format = input_format_t::json,
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const bool strict = true)
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const bool strict = true,
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const bool ignore_comments = false)
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{
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auto ia = detail::input_adapter(std::move(first), std::move(last));
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return format == input_format_t::json
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? parser(std::move(ia)).sax_parse(sax, strict)
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? parser(std::move(ia), nullptr, true, ignore_comments).sax_parse(sax, strict)
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: detail::binary_reader<basic_json, decltype(ia), SAX>(std::move(ia)).sax_parse(format, sax, strict);
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}
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@ -6790,11 +6813,12 @@ class basic_json
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JSON_HEDLEY_NON_NULL(2)
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static bool sax_parse(detail::span_input_adapter&& i, SAX* sax,
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input_format_t format = input_format_t::json,
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const bool strict = true)
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const bool strict = true,
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const bool ignore_comments = false)
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{
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auto ia = i.get();
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return format == input_format_t::json
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? parser(std::move(ia)).sax_parse(sax, strict)
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? parser(std::move(ia), nullptr, true, ignore_comments).sax_parse(sax, strict)
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: detail::binary_reader<basic_json, decltype(ia), SAX>(std::move(ia)).sax_parse(format, sax, strict);
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}
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@ -8183,8 +8183,11 @@ class lexer : public lexer_base<BasicJsonType>
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public:
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using token_type = typename lexer_base<BasicJsonType>::token_type;
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explicit lexer(InputAdapterType&& adapter)
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: ia(std::move(adapter)), decimal_point_char(static_cast<char_int_type>(get_decimal_point())) {}
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explicit lexer(InputAdapterType&& adapter, bool ignore_comments_ = false)
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: ia(std::move(adapter))
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, ignore_comments(ignore_comments_)
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, decimal_point_char(static_cast<char_int_type>(get_decimal_point()))
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{}
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// delete because of pointer members
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lexer(const lexer&) = delete;
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@ -8897,6 +8900,77 @@ class lexer : public lexer_base<BasicJsonType>
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}
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}
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/*!
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* @brief scan a comment
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* @return whether comment could be scanned successfully
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*/
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bool scan_comment()
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{
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switch (get())
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{
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// single-line comments skip input until a newline or EOF is read
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case '/':
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{
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while (true)
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{
|
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switch (get())
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{
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case '\n':
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case '\r':
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case std::char_traits<char_type>::eof():
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case '\0':
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return true;
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default:
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break;
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}
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}
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}
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// multi-line comments skip input until */ is read
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case '*':
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{
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while (true)
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{
|
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switch (get())
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{
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case std::char_traits<char_type>::eof():
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case '\0':
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{
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error_message = "invalid comment; missing closing '*/'";
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return false;
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}
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case '*':
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{
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switch (get())
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{
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case '/':
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return true;
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default:
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{
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unget();
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break;
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}
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}
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}
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default:
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break;
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}
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}
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}
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// unexpected character after reading '/'
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default:
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{
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error_message = "invalid comment; expecting '/' or '*' after '/'";
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return false;
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}
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}
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}
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JSON_HEDLEY_NON_NULL(2)
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static void strtof(float& f, const char* str, char** endptr) noexcept
|
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{
|
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|
|
@ -9486,6 +9560,15 @@ scan_number_done:
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return true;
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}
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|
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void skip_whitespace()
|
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{
|
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do
|
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{
|
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get();
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}
|
||||
while (current == ' ' or current == '\t' or current == '\n' or current == '\r');
|
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}
|
||||
|
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token_type scan()
|
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{
|
||||
// initially, skip the BOM
|
||||
|
|
@ -9496,11 +9579,19 @@ scan_number_done:
|
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}
|
||||
|
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// read next character and ignore whitespace
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do
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||||
skip_whitespace();
|
||||
|
||||
// ignore comments
|
||||
if (ignore_comments and current == '/')
|
||||
{
|
||||
get();
|
||||
if (not scan_comment())
|
||||
{
|
||||
return token_type::parse_error;
|
||||
}
|
||||
|
||||
// skip following whitespace
|
||||
skip_whitespace();
|
||||
}
|
||||
while (current == ' ' or current == '\t' or current == '\n' or current == '\r');
|
||||
|
||||
switch (current)
|
||||
{
|
||||
|
|
@ -9570,6 +9661,9 @@ scan_number_done:
|
|||
/// input adapter
|
||||
InputAdapterType ia;
|
||||
|
||||
/// whether comments should be ignored (true) or signaled as errors (false)
|
||||
const bool ignore_comments = false;
|
||||
|
||||
/// the current character
|
||||
char_int_type current = std::char_traits<char_type>::eof();
|
||||
|
||||
|
|
@ -9672,8 +9766,11 @@ class parser
|
|||
/// a parser reading from an input adapter
|
||||
explicit parser(InputAdapterType&& adapter,
|
||||
const parser_callback_t<BasicJsonType> cb = nullptr,
|
||||
const bool allow_exceptions_ = true)
|
||||
: callback(cb), m_lexer(std::move(adapter)), allow_exceptions(allow_exceptions_)
|
||||
const bool allow_exceptions_ = true,
|
||||
const bool skip_comments = false)
|
||||
: callback(cb)
|
||||
, m_lexer(std::move(adapter), skip_comments)
|
||||
, allow_exceptions(allow_exceptions_)
|
||||
{
|
||||
// read first token
|
||||
get_token();
|
||||
|
|
@ -15994,10 +16091,12 @@ class basic_json
|
|||
static ::nlohmann::detail::parser<basic_json, InputAdapterType> parser(
|
||||
InputAdapterType adapter,
|
||||
detail::parser_callback_t<basic_json>cb = nullptr,
|
||||
bool allow_exceptions = true
|
||||
const bool allow_exceptions = true,
|
||||
const bool ignore_comments = false
|
||||
)
|
||||
{
|
||||
return ::nlohmann::detail::parser<basic_json, InputAdapterType>(std::move(adapter), std::move(cb), allow_exceptions);
|
||||
return ::nlohmann::detail::parser<basic_json, InputAdapterType>(std::move(adapter),
|
||||
std::move(cb), allow_exceptions, ignore_comments);
|
||||
}
|
||||
|
||||
using primitive_iterator_t = ::nlohmann::detail::primitive_iterator_t;
|
||||
|
|
@ -22389,6 +22488,9 @@ class basic_json
|
|||
(optional)
|
||||
@param[in] allow_exceptions whether to throw exceptions in case of a
|
||||
parse error (optional, true by default)
|
||||
@param[in] ignore_comments whether comments should be ignored and treated
|
||||
like whitespace (true) or yield a parse error (true); (optional, false by
|
||||
default)
|
||||
|
||||
@return deserialized JSON value; in case of a parse error and
|
||||
@a allow_exceptions set to `false`, the return value will be
|
||||
|
|
@ -22417,16 +22519,18 @@ class basic_json
|
|||
@liveexample{The example below demonstrates the `parse()` function reading
|
||||
from a contiguous container.,parse__contiguouscontainer__parser_callback_t}
|
||||
|
||||
@since version 2.0.3 (contiguous containers)
|
||||
@since version 2.0.3 (contiguous containers); version 3.9.0 allowed to
|
||||
ignore comments.
|
||||
*/
|
||||
template<typename InputType>
|
||||
JSON_HEDLEY_WARN_UNUSED_RESULT
|
||||
static basic_json parse(InputType&& i,
|
||||
const parser_callback_t cb = nullptr,
|
||||
const bool allow_exceptions = true)
|
||||
const bool allow_exceptions = true,
|
||||
const bool ignore_comments = false)
|
||||
{
|
||||
basic_json result;
|
||||
parser(detail::input_adapter(std::forward<InputType>(i)), cb, allow_exceptions).parse(true, result);
|
||||
parser(detail::input_adapter(std::forward<InputType>(i)), cb, allow_exceptions, ignore_comments).parse(true, result);
|
||||
return result;
|
||||
}
|
||||
|
||||
|
|
@ -22443,6 +22547,9 @@ class basic_json
|
|||
(optional)
|
||||
@param[in] allow_exceptions whether to throw exceptions in case of a
|
||||
parse error (optional, true by default)
|
||||
@param[in] ignore_comments whether comments should be ignored and treated
|
||||
like whitespace (true) or yield a parse error (true); (optional, false by
|
||||
default)
|
||||
|
||||
@return deserialized JSON value; in case of a parse error and
|
||||
@a allow_exceptions set to `false`, the return value will be
|
||||
|
|
@ -22458,10 +22565,11 @@ class basic_json
|
|||
static basic_json parse(IteratorType first,
|
||||
IteratorType last,
|
||||
const parser_callback_t cb = nullptr,
|
||||
const bool allow_exceptions = true)
|
||||
const bool allow_exceptions = true,
|
||||
const bool ignore_comments = false)
|
||||
{
|
||||
basic_json result;
|
||||
parser(detail::input_adapter(std::move(first), std::move(last)), cb, allow_exceptions).parse(true, result);
|
||||
parser(detail::input_adapter(std::move(first), std::move(last)), cb, allow_exceptions, ignore_comments).parse(true, result);
|
||||
return result;
|
||||
}
|
||||
|
||||
|
|
@ -22469,10 +22577,11 @@ class basic_json
|
|||
JSON_HEDLEY_DEPRECATED_FOR(3.8.0, parse(ptr, ptr + len))
|
||||
static basic_json parse(detail::span_input_adapter&& i,
|
||||
const parser_callback_t cb = nullptr,
|
||||
const bool allow_exceptions = true)
|
||||
const bool allow_exceptions = true,
|
||||
const bool ignore_comments = false)
|
||||
{
|
||||
basic_json result;
|
||||
parser(i.get(), cb, allow_exceptions).parse(true, result);
|
||||
parser(i.get(), cb, allow_exceptions, ignore_comments).parse(true, result);
|
||||
return result;
|
||||
}
|
||||
|
||||
|
|
@ -22492,6 +22601,9 @@ class basic_json
|
|||
iterators.
|
||||
|
||||
@param[in] i input to read from
|
||||
@param[in] ignore_comments whether comments should be ignored and treated
|
||||
like whitespace (true) or yield a parse error (true); (optional, false by
|
||||
default)
|
||||
|
||||
@return Whether the input read from @a i is valid JSON.
|
||||
|
||||
|
|
@ -22504,22 +22616,25 @@ class basic_json
|
|||
from a string.,accept__string}
|
||||
*/
|
||||
template<typename InputType>
|
||||
static bool accept(InputType&& i)
|
||||
static bool accept(InputType&& i,
|
||||
const bool ignore_comments = false)
|
||||
{
|
||||
return parser(detail::input_adapter(std::forward<InputType>(i))).accept(true);
|
||||
return parser(detail::input_adapter(std::forward<InputType>(i)), nullptr, false, ignore_comments).accept(true);
|
||||
}
|
||||
|
||||
template<typename IteratorType>
|
||||
static bool accept(IteratorType first, IteratorType last)
|
||||
static bool accept(IteratorType first, IteratorType last,
|
||||
const bool ignore_comments = false)
|
||||
{
|
||||
return parser(detail::input_adapter(std::move(first), std::move(last))).accept(true);
|
||||
return parser(detail::input_adapter(std::move(first), std::move(last)), nullptr, false, ignore_comments).accept(true);
|
||||
}
|
||||
|
||||
JSON_HEDLEY_WARN_UNUSED_RESULT
|
||||
JSON_HEDLEY_DEPRECATED_FOR(3.8.0, accept(ptr, ptr + len))
|
||||
static bool accept(detail::span_input_adapter&& i)
|
||||
static bool accept(detail::span_input_adapter&& i,
|
||||
const bool ignore_comments = false)
|
||||
{
|
||||
return parser(i.get()).accept(true);
|
||||
return parser(i.get(), nullptr, false, ignore_comments).accept(true);
|
||||
}
|
||||
|
||||
/*!
|
||||
|
|
@ -22539,6 +22654,9 @@ class basic_json
|
|||
@param[in,out] sax SAX event listener
|
||||
@param[in] format the format to parse (JSON, CBOR, MessagePack, or UBJSON)
|
||||
@param[in] strict whether the input has to be consumed completely
|
||||
@param[in] ignore_comments whether comments should be ignored and treated
|
||||
like whitespace (true) or yield a parse error (true); (optional, false by
|
||||
default); only applies to the JSON file format.
|
||||
|
||||
@return return value of the last processed SAX event
|
||||
|
||||
|
|
@ -22563,11 +22681,12 @@ class basic_json
|
|||
JSON_HEDLEY_NON_NULL(2)
|
||||
static bool sax_parse(InputType&& i, SAX* sax,
|
||||
input_format_t format = input_format_t::json,
|
||||
const bool strict = true)
|
||||
const bool strict = true,
|
||||
const bool ignore_comments = false)
|
||||
{
|
||||
auto ia = detail::input_adapter(std::forward<InputType>(i));
|
||||
return format == input_format_t::json
|
||||
? parser(std::move(ia)).sax_parse(sax, strict)
|
||||
? parser(std::move(ia), nullptr, true, ignore_comments).sax_parse(sax, strict)
|
||||
: detail::binary_reader<basic_json, decltype(ia), SAX>(std::move(ia)).sax_parse(format, sax, strict);
|
||||
}
|
||||
|
||||
|
|
@ -22575,11 +22694,12 @@ class basic_json
|
|||
JSON_HEDLEY_NON_NULL(3)
|
||||
static bool sax_parse(IteratorType first, IteratorType last, SAX* sax,
|
||||
input_format_t format = input_format_t::json,
|
||||
const bool strict = true)
|
||||
const bool strict = true,
|
||||
const bool ignore_comments = false)
|
||||
{
|
||||
auto ia = detail::input_adapter(std::move(first), std::move(last));
|
||||
return format == input_format_t::json
|
||||
? parser(std::move(ia)).sax_parse(sax, strict)
|
||||
? parser(std::move(ia), nullptr, true, ignore_comments).sax_parse(sax, strict)
|
||||
: detail::binary_reader<basic_json, decltype(ia), SAX>(std::move(ia)).sax_parse(format, sax, strict);
|
||||
}
|
||||
|
||||
|
|
@ -22588,11 +22708,12 @@ class basic_json
|
|||
JSON_HEDLEY_NON_NULL(2)
|
||||
static bool sax_parse(detail::span_input_adapter&& i, SAX* sax,
|
||||
input_format_t format = input_format_t::json,
|
||||
const bool strict = true)
|
||||
const bool strict = true,
|
||||
const bool ignore_comments = false)
|
||||
{
|
||||
auto ia = i.get();
|
||||
return format == input_format_t::json
|
||||
? parser(std::move(ia)).sax_parse(sax, strict)
|
||||
? parser(std::move(ia), nullptr, true, ignore_comments).sax_parse(sax, strict)
|
||||
: detail::binary_reader<basic_json, decltype(ia), SAX>(std::move(ia)).sax_parse(format, sax, strict);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -37,14 +37,23 @@ using nlohmann::json;
|
|||
namespace
|
||||
{
|
||||
// shortcut to scan a string literal
|
||||
json::lexer::token_type scan_string(const char* s);
|
||||
json::lexer::token_type scan_string(const char* s)
|
||||
json::lexer::token_type scan_string(const char* s, const bool ignore_comments = false);
|
||||
json::lexer::token_type scan_string(const char* s, const bool ignore_comments)
|
||||
{
|
||||
auto ia = nlohmann::detail::input_adapter(s);
|
||||
return nlohmann::detail::lexer<json, decltype(ia)>(std::move(ia)).scan();
|
||||
return nlohmann::detail::lexer<json, decltype(ia)>(std::move(ia), ignore_comments).scan();
|
||||
}
|
||||
}
|
||||
|
||||
std::string get_error_message(const char* s, const bool ignore_comments = false);
|
||||
std::string get_error_message(const char* s, const bool ignore_comments)
|
||||
{
|
||||
auto ia = nlohmann::detail::input_adapter(s);
|
||||
auto lexer = nlohmann::detail::lexer<json, decltype(ia)>(std::move(ia), ignore_comments);
|
||||
lexer.scan();
|
||||
return lexer.get_error_message();
|
||||
}
|
||||
|
||||
TEST_CASE("lexer class")
|
||||
{
|
||||
SECTION("scan")
|
||||
|
|
@ -127,6 +136,8 @@ TEST_CASE("lexer class")
|
|||
// store scan() result
|
||||
const auto res = scan_string(s.c_str());
|
||||
|
||||
CAPTURE(s);
|
||||
|
||||
switch (c)
|
||||
{
|
||||
// single characters that are valid tokens
|
||||
|
|
@ -179,4 +190,56 @@ TEST_CASE("lexer class")
|
|||
s += "\"";
|
||||
CHECK((scan_string(s.c_str()) == json::lexer::token_type::value_string));
|
||||
}
|
||||
|
||||
SECTION("fail on comments")
|
||||
{
|
||||
CHECK((scan_string("/", false) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("/", false) == "invalid literal");
|
||||
|
||||
CHECK((scan_string("/!", false) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("/!", false) == "invalid literal");
|
||||
CHECK((scan_string("/*", false) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("/*", false) == "invalid literal");
|
||||
CHECK((scan_string("/**", false) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("/**", false) == "invalid literal");
|
||||
|
||||
CHECK((scan_string("//", false) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("//", false) == "invalid literal");
|
||||
CHECK((scan_string("/**/", false) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("/**/", false) == "invalid literal");
|
||||
CHECK((scan_string("/** /", false) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("/** /", false) == "invalid literal");
|
||||
|
||||
CHECK((scan_string("/***/", false) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("/***/", false) == "invalid literal");
|
||||
CHECK((scan_string("/* true */", false) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("/* true */", false) == "invalid literal");
|
||||
CHECK((scan_string("/*/**/", false) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("/*/**/", false) == "invalid literal");
|
||||
CHECK((scan_string("/*/* */", false) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("/*/* */", false) == "invalid literal");
|
||||
}
|
||||
|
||||
SECTION("ignore comments")
|
||||
{
|
||||
CHECK((scan_string("/", true) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("/", true) == "invalid comment; expecting '/' or '*' after '/'");
|
||||
|
||||
CHECK((scan_string("/!", true) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("/!", true) == "invalid comment; expecting '/' or '*' after '/'");
|
||||
CHECK((scan_string("/*", true) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("/*", true) == "invalid comment; missing closing '*/'");
|
||||
CHECK((scan_string("/**", true) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("/**", true) == "invalid comment; missing closing '*/'");
|
||||
|
||||
CHECK((scan_string("//", true) == json::lexer::token_type::end_of_input));
|
||||
CHECK((scan_string("/**/", true) == json::lexer::token_type::end_of_input));
|
||||
CHECK((scan_string("/** /", true) == json::lexer::token_type::parse_error));
|
||||
CHECK(get_error_message("/** /", true) == "invalid comment; missing closing '*/'");
|
||||
|
||||
CHECK((scan_string("/***/", true) == json::lexer::token_type::end_of_input));
|
||||
CHECK((scan_string("/* true */", true) == json::lexer::token_type::end_of_input));
|
||||
CHECK((scan_string("/*/**/", true) == json::lexer::token_type::end_of_input));
|
||||
CHECK((scan_string("/*/* */", true) == json::lexer::token_type::end_of_input));
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -224,6 +224,7 @@ class SaxCountdown : public nlohmann::json::json_sax_t
|
|||
|
||||
json parser_helper(const std::string& s);
|
||||
bool accept_helper(const std::string& s);
|
||||
void comments_helper(const std::string& s);
|
||||
|
||||
json parser_helper(const std::string& s)
|
||||
{
|
||||
|
|
@ -241,6 +242,8 @@ json parser_helper(const std::string& s)
|
|||
json::sax_parse(s, &sdp);
|
||||
CHECK(j_sax == j);
|
||||
|
||||
comments_helper(s);
|
||||
|
||||
return j;
|
||||
}
|
||||
|
||||
|
|
@ -275,10 +278,50 @@ bool accept_helper(const std::string& s)
|
|||
// 6. check if this approach came to the same result
|
||||
CHECK(ok_noexcept == ok_noexcept_cb);
|
||||
|
||||
// 7. return result
|
||||
// 7. check if comments are properly ignored
|
||||
if (ok_accept)
|
||||
{
|
||||
comments_helper(s);
|
||||
}
|
||||
|
||||
// 8. return result
|
||||
return ok_accept;
|
||||
}
|
||||
|
||||
void comments_helper(const std::string& s)
|
||||
{
|
||||
json _;
|
||||
|
||||
// parse/accept with default parser
|
||||
CHECK_NOTHROW(_ = json::parse(s));
|
||||
CHECK(json::accept(s));
|
||||
|
||||
// parse/accept while skipping comments
|
||||
CHECK_NOTHROW(_ = json::parse(s, nullptr, false, true));
|
||||
CHECK(json::accept(s, true));
|
||||
|
||||
std::vector<std::string> json_with_comments;
|
||||
|
||||
// start with a comment
|
||||
json_with_comments.push_back(std::string("// this is a comment\n") + s);
|
||||
json_with_comments.push_back(std::string("/* this is a comment */") + s);
|
||||
// end with a comment
|
||||
json_with_comments.push_back(s + "// this is a comment");
|
||||
json_with_comments.push_back(s + "/* this is a comment */");
|
||||
|
||||
// check all strings
|
||||
for (const auto& json_with_comment : json_with_comments)
|
||||
{
|
||||
CAPTURE(json_with_comment)
|
||||
CHECK_THROWS_AS(_ = json::parse(json_with_comment), json::parse_error);
|
||||
CHECK(not json::accept(json_with_comment));
|
||||
|
||||
CHECK_NOTHROW(_ = json::parse(json_with_comment, nullptr, true, true));
|
||||
CHECK(json::accept(json_with_comment, true));
|
||||
}
|
||||
}
|
||||
|
||||
} // namespace
|
||||
|
||||
TEST_CASE("parser class")
|
||||
{
|
||||
|
|
@ -1834,4 +1877,10 @@ TEST_CASE("parser class")
|
|||
}
|
||||
}
|
||||
}
|
||||
|
||||
SECTION("error messages for comments")
|
||||
{
|
||||
CHECK_THROWS_WITH_AS(json::parse("/a", nullptr, true, true), "[json.exception.parse_error.101] parse error at line 1, column 2: syntax error while parsing value - invalid comment; expecting '/' or '*' after '/'; last read: '/a'", json::parse_error);
|
||||
CHECK_THROWS_WITH_AS(json::parse("/*", nullptr, true, true), "[json.exception.parse_error.101] parse error at line 1, column 3: syntax error while parsing value - invalid comment; missing closing '*/'; last read: '/*<U+0000>'", json::parse_error);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue