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Adds string concat operator to BT #1

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Merged
merged 1 commit into from
Jul 29, 2024
Merged

Adds string concat operator to BT #1

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21 changes: 20 additions & 1 deletion include/behaviortree_cpp/scripting/operators.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -130,6 +130,7 @@ struct ExprBinaryArithmetic : ExprBase
minus,
times,
div,
concat,

bit_and,
bit_or,
Expand All @@ -151,6 +152,8 @@ struct ExprBinaryArithmetic : ExprBase
return "*";
case div:
return "/";
case concat:
return "..";
case bit_and:
return "&";
case bit_or:
Expand Down Expand Up @@ -256,6 +259,12 @@ struct ExprBinaryArithmetic : ExprBase
{
return Any(lhs_v.cast<std::string>() + rhs_v.cast<std::string>());
}
else if (op == concat && ((rhs_v.isString() && lhs_v.isString()) ||
(rhs_v.isString() && lhs_v.isNumber()) ||
(rhs_v.isNumber() && lhs_v.isString())))
{
return Any(lhs_v.cast<std::string>() + rhs_v.cast<std::string>());
}
else
{
throw RuntimeError("Operation not permitted");
Expand Down Expand Up @@ -694,6 +703,16 @@ struct Expression : lexy::expression_production
using operand = math_product;
};

// x .. y
struct string_concat : dsl::infix_op_left
{
static constexpr auto op = [] {
return dsl::op<Ast::ExprBinaryArithmetic::concat>(LEXY_LIT(".."));
}();

using operand = math_sum;
};

// ~x
struct bit_prefix : dsl::prefix_op
{
Expand Down Expand Up @@ -757,7 +776,7 @@ struct Expression : lexy::expression_production
dsl::op<Ast::ExprBinaryArithmetic::logic_or>(LEXY_LIT("||")) /
dsl::op<Ast::ExprBinaryArithmetic::logic_and>(LEXY_LIT("&&"));

using operand = comparison;
using operand = dsl::groups<string_concat, comparison>;
};

// x ? y : z
Expand Down