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Questions tagged [boost-spirit-x3]

LL parser framework represents parsers directly as EBNF grammars in inlined C++14

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boost::spirit::x3 phrase_parse doing arithmetic operations before pushing into vector

I'm working on a project for my univertitiy studies. My goal is to read double numbers from a large file (2,6 GB) into a double vector. I am working with the boost spirit x3 library with mmap. I have found some code in the net:…
squbr_
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Howto register error handler with boost spirit x3?

I have some troubles getting the error handler to work with boost spirit x3. I was looking at the documentation (https://www.boost.org/doc/libs/1_70_0/libs/spirit/doc/x3/html/spirit_x3/tutorials/error_handling.html) but I don't understand the…
Max
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Parse Eigen Matrix with Boost Spirit X3

I'm trying to parse an Eigen::Matrix3f matrix with Boost Spirit X3, where the input string is matrix(a,b,c,d,tx,ty) and the resulting Eigen 3x3 matrix will be the following: [a, c, tx b, d, ty 0, 0, 1] I can already synthesize std::vector…
Jaime Ivan Cervantes
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how to change the parser of a rule

Is it possible to modify the parser of a rule at runtime? I am able to dynamically create parsers (classes that are derived from parser_base), but I dont know how I can assign the new parser to an existing rule. Basically my problem is that I want…
codingdave
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x3 modify parser at runtime

I wonder if it is possible to change the parser at runtime given it does not change the compound attribute. Lets say I want to be able to modify at runtime the character of my parser that detects whether I have to join a line from ; to ~. Both are…
codingdave
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Simple sematic action destroys the result in Spirit X3

I have this Spirit X3 parser auto xyz_def = x3::omit[x3::int_] >> x3::eol >> (x3::lexeme[+(x3::char_ - x3::eol)]) >> x3::eol >> (*(chemical::parser::atom >> x3::eol) ; Which parses, with no problem something like…
alfC
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Issue with X3 and MS VS2017

I am having a weird problem with boost spirit X3 (v1.69) in combination with MS VS2017. I am getting compiling errors in well formed structures. When I use the same code block in gcc and clang through Coliru or Wandbox, the source compiles and…
Pablo
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For spirit::x3, what is the right way to deal with unknown symbols?

A newbie for x3... The code is adapted from the roman.cpp in the x3 tutorial. Suppose I have a symbol table like below: struct car_models_ : x3::symbols { car_models_() { add ("sedan", 1) …
user180574
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Improvements in repeat directive with variable factor for X3

I need to parse a sequence of elements where there is a first number telling how many elements must be parsed next. As a simplification of what I need: [3 10 20 30] should be parsed as showed next: - Number of elements: 3 - Vector of elements: {10,…
Pablo
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Position annotation for sequences in Spirit X3

What is considered good form for adding position annotations for rules that return sequences? Assuming I have a rule in my grammar of the form: const auto array_def = '[' >> *int_ >> ']'; that synthesizes an attribute of type std::vector< int >, I…
Engineerist
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Parsing map of variants with Boost Spirit X3

I am trying (and failing) to parse a map> using Boost Spirit X3, with the following code: #include #include #include…
Jaime Ivan Cervantes
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Parsing CSS with Boost.Spirit X3

I'm attempting to write a (partial) CSS parser using Boost.Spirit X3. I have the (very) basic setup working: const auto declaration_block_def = '{' >> +declaration >> '}'; const auto declaration_def = property >> ':' >> value >> ';'; const auto…
rubenvb
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Automatic attribute propagation sometimes doesn't work when combining `%` and optional suffixes

Using boost 1.61, on both clang 3.8.0, and GCC 5.4, I get errors when compiling the following code: #include #include #include #include #include #include…
Paul Belanger
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Spirit.X3 with lambda returning different parser types

Here I try to convert a string literal to a number, where the base specifer is dynamic: #include #include namespace ast { struct literal { enum base_specifier { bin, oct, hex }; …
Olx
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Does Boost Spirit X3 support left recursion?

One of the shortcomings/implementation challenges of recursive-descent parsers is dealing with left recursion, e.g. := '+' | The parser needs to parse an expr before it can parse an expr... Now,…
einpoklum
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