LL parser framework represents parsers directly as EBNF grammars in inlined C++14
Questions tagged [boost-spirit-x3]
281 questions
3
votes
1 answer
Boost Spirit x3 parser has attribute of type std::vector> instead of std::string
Context
I am using Boost Spirit X3 to generate HTML from Markdown files like this:
// simplified code structure
auto str = x3::lexeme[+(x3::char_ - x3::eol)];
auto h1_action = [&](auto& ctx) { /* generate output */ };
auto h1 = ("# " >…
melina
- 68
- 5
3
votes
3 answers
Spirit X3: Custom number parser yield unexpected leading zero in the result
I'm writing a long number parser, which identify a valid number (maybe not representable in builtin integer type) and store the string as-is. But the result included an unexpected leading '0'.
The parser simply identify numbers in the form like…
Suen
- 73
- 6
3
votes
2 answers
Cannot parse an empty C++ struct with Boost Spirit X3
I'm trying to parse a C++ struct defined in a header file. I'm starting to define the grammar but I've a problem.
This is my code:
#include
int main() {
namespace x3 = boost::spirit::x3;
// Parse "#if !defined…
Jepessen
- 11,744
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- 149
3
votes
0 answers
Chaining semantic actions
I'm having trouble chaining semantic actions.
I want to parse a percentage (X% with X a real number) and return its value as a float between 0 and 1. I also want to fail if the percentage is higher than 100%.
What I have currently is a two almost…
rubenvb
- 74,642
- 33
- 187
- 332
3
votes
1 answer
Passing each element of a parsed sequence to a function that returns a rule's attribute type
I want to parse CSS color functions (for simplicity, all of the arguments are numbers between 0 and 255)
rgb(r,g,b)
rgba(r,g,b,a)
hsl(h,s,l)
hsla(h,s,l,a)
into
struct color
{
color(std::uint8_t r, std::uint8_t g, std::uint8_t b, std::uint8_t a)…
rubenvb
- 74,642
- 33
- 187
- 332
3
votes
1 answer
Getting into boost spirit; Qi or X3?
I was making an interpreter for a small personal project with a friend; we started implementing all the classes and general structure in which the code would be translated to then execute just to postpone the actual parsing code into these…
Barnack
- 921
- 1
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3
votes
1 answer
Can spirit X3 work with BOOST_FUSION_ADAPT_ADT?
Change my codes from QI to X3, and get some compile error with BOOST_FUSION_ADAPT_ADT. I tried boost 1.64 and 1.67, neither of them work. I modified the spirit X3 example rexpr_min, adding getter and setter to struct rexpr, changing the…
He Ming
- 88
- 6
3
votes
1 answer
Boost spirit x3 parser doesn't work with multiple attribute
The Spirit X3 parser function works well using 1 attribut. When I try to compile the code from the documentation with multiple attribute, it doesn't work.
#include
#include
using namespace std;
using namespace…
DrIDK
- 7,642
- 2
- 14
- 14
3
votes
1 answer
X3 parse rule doesn't compile
I'm learning Boost Spirit by writing a parser that parses two variants of hex number used by NAMS:
Hex number with either suffix of 0x/0h or prefix of h/x.
Hex number with prefix of $ and must be followed by a decimal digit.
Here is what I have…
Yman Yen
- 33
- 2
3
votes
1 answer
Boost-Spirit (X3) parsing without default constructors
I'm trying to use Spirit X3 from Boost 1.65.1 to make a parser. I have reduced my problem to the following smaller example with simpler structures:
#include
#include
#include…
senevoldsen
- 337
- 3
- 8
3
votes
1 answer
X3: How to create parser to read in sets?
How would one create a rule for reading integers in sets of 3. I.e., ...
1 2 3 OK, 1 set of 3 ints
1 2 3 4 5 6 OK, 2 sets of 3 ints
1 2 3 4 5 ERROR, 1 set of 3 ints, 1 short for 2nd
1 2 3 4 5 6 7 8 9 …
Ender
- 1,652
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3
votes
1 answer
Recursive rule in Spirit.X3
I want to parse a recursive grammar with Boost.Spirit x3, but it fails with a template instantiation depth problem.
The grammar looks like :
value: int | float | char | tuple
int: "int: " int_
float: "float: " real_
char: "char: " char_
tuple:…
Jean-Michaël Celerier
- 7,412
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3
votes
1 answer
How do I properly specify anchoring conditions in Spirit X3?
I am new to writing parsers. I am attempting to create a parser which can extract US zip codes from input text. I have created the following parser patterns, which do most of what I want. I am able to match 5 digit zip codes, or 9 digit zip codes…
Joe A
- 33
- 2
3
votes
1 answer
How future-safe is it to write a parser with Boost Spirit X3?
I'm considering writing what is essentially my first parser since forever (= since the compiler class at Uni which I've forgotten mostly).
Since I use C++, I was thinking of using Boost Spirit. Then I noticed there's the "regular" 2.5.2 and there's…
einpoklum
- 118,144
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- 684
3
votes
1 answer
Parsing list of variants with boost spirit X3
I try to parse a simple list of float or int into a vector of variant. I'm using boost 1.64 on Windows (mingw 64bit).
Here is a minimal example:
#include
#include…
Mike M
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