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#pragma once
#include <memory>
#include <string>
#include <vector>
#include <openvic-dataloader/v2script/AbstractSyntaxTree.hpp>
#include <lexy/callback.hpp>
#include <lexy/dsl.hpp>
#include "detail/LexyLitRange.hpp"
// Grammar Definitions //
/* REQUIREMENTS:
* DAT-626
* DAT-627
* DAT-628
* DAT-636
* DAT-641
* DAT-642
* DAT-643
*/
namespace ovdl::v2script::grammar {
struct ParseOptions {
/// @brief Makes string parsing avoid string escapes
bool NoStringEscape;
};
static constexpr ParseOptions NoStringEscapeOption = ParseOptions { true };
static constexpr ParseOptions StringEscapeOption = ParseOptions { false };
template<ParseOptions Options>
struct StatementListBlock;
template<ParseOptions Options>
struct AssignmentStatement;
/* REQUIREMENTS: DAT-630 */
static constexpr auto whitespace_specifier = lexy::dsl::ascii::blank / lexy::dsl::ascii::newline;
/* REQUIREMENTS: DAT-631 */
static constexpr auto comment_specifier = LEXY_LIT("#") >> lexy::dsl::until(lexy::dsl::newline).or_eof();
/* REQUIREMENTS:
* DAT-632
* DAT-635
*/
static constexpr auto data_specifier =
lexy::dsl::ascii::alpha_digit_underscore / LEXY_ASCII_ONE_OF("+:@%&'-.") /
lexy::dsl::lit_b<0x8A> / lexy::dsl::lit_b<0x8C> / lexy::dsl::lit_b<0x8E> /
lexy::dsl::lit_b<0x92> / lexy::dsl::lit_b<0x97> / lexy::dsl::lit_b<0x9A> / lexy::dsl::lit_b<0x9C> /
detail::lexydsl::make_range<0x9E, 0x9F>() /
detail::lexydsl::make_range<0xC0, 0xD6>() /
detail::lexydsl::make_range<0xD8, 0xF6>() /
detail::lexydsl::make_range<0xF8, 0xFF>();
static constexpr auto data_char_class = LEXY_CHAR_CLASS("DataSpecifier", data_specifier);
static constexpr auto escaped_symbols = lexy::symbol_table<char> //
.map<'"'>('"')
.map<'\''>('\'')
.map<'\\'>('\\')
.map<'/'>('/')
.map<'b'>('\b')
.map<'f'>('\f')
.map<'n'>('\n')
.map<'r'>('\r')
.map<'t'>('\t');
template<ParseOptions Options>
struct Identifier {
static constexpr auto rule = lexy::dsl::identifier(data_char_class);
static constexpr auto value = lexy::callback<ast::NodePtr>(
[](auto lexeme) {
std::string str(lexeme.data(), lexeme.size());
return ast::make_node_ptr<ast::IdentifierNode>(ast::NodeLocation { lexeme.begin(), lexeme.end() }, LEXY_MOV(str));
});
};
/* REQUIREMENTS:
* DAT-633
* DAT-634
*/
template<ParseOptions Options>
struct StringExpression {
static constexpr auto rule = [] {
// Arbitrary code points that aren't control characters.
auto c = ovdl::detail::lexydsl::make_range<0x20, 0xFF>() - lexy::dsl::ascii::control;
if constexpr (Options.NoStringEscape) {
return lexy::dsl::delimited(lexy::dsl::position(lexy::dsl::lit_b<'"'>))(c);
} else {
// Escape sequences start with a backlash.
// They either map one of the symbols,
// or a Unicode code point of the form uXXXX.
auto escape = lexy::dsl::backslash_escape //
.symbol<escaped_symbols>();
return lexy::dsl::delimited(lexy::dsl::position(lexy::dsl::lit_b<'"'>))(c, escape);
}
}();
static constexpr auto value =
lexy::as_string<std::string> >>
lexy::callback<ast::NodePtr>(
[](const char* begin, auto&& str, const char* end) {
return ast::make_node_ptr<ast::StringNode>(ast::NodeLocation::make_from(begin, end), LEXY_MOV(str));
});
};
/* REQUIREMENTS: DAT-638 */
template<ParseOptions Options>
struct ValueExpression {
static constexpr auto rule = lexy::dsl::p<Identifier<Options>> | lexy::dsl::p<StringExpression<Options>>;
static constexpr auto value = lexy::forward<ast::NodePtr>;
};
template<ParseOptions Options>
struct SimpleAssignmentStatement {
static constexpr auto rule =
lexy::dsl::position(lexy::dsl::p<Identifier<Options>>) >>
(lexy::dsl::equal_sign +
(lexy::dsl::p<ValueExpression<Options>> | lexy::dsl::recurse_branch<StatementListBlock<Options>>));
static constexpr auto value = lexy::callback<ast::NodePtr>(
[](const char* pos, auto name, auto&& initalizer) {
return ast::make_node_ptr<ast::AssignNode>(pos, LEXY_MOV(name), LEXY_MOV(initalizer));
});
};
/* REQUIREMENTS: DAT-639 */
template<ParseOptions Options>
struct AssignmentStatement {
static constexpr auto rule =
lexy::dsl::position(lexy::dsl::p<Identifier<Options>>) >>
(lexy::dsl::equal_sign >>
(lexy::dsl::p<ValueExpression<Options>> | lexy::dsl::recurse_branch<StatementListBlock<Options>>) |
lexy::dsl::else_ >> lexy::dsl::return_) |
lexy::dsl::p<StringExpression<Options>> |
lexy::dsl::recurse_branch<StatementListBlock<Options>>;
static constexpr auto value = lexy::callback<ast::NodePtr>(
[](const char* pos, auto name, lexy::nullopt = {}) {
return LEXY_MOV(name);
},
[](auto name, lexy::nullopt = {}) {
return LEXY_MOV(name);
},
[](const char* pos, auto name, auto&& initalizer) {
return ast::make_node_ptr<ast::AssignNode>(pos, LEXY_MOV(name), LEXY_MOV(initalizer));
});
};
/* REQUIREMENTS: DAT-640 */
template<ParseOptions Options>
struct StatementListBlock {
static constexpr auto rule =
lexy::dsl::position(lexy::dsl::curly_bracketed.open()) >>
(lexy::dsl::opt(lexy::dsl::list(lexy::dsl::recurse_branch<AssignmentStatement<Options>>)) +
lexy::dsl::opt(lexy::dsl::semicolon)) >>
lexy::dsl::position(lexy::dsl::curly_bracketed.close());
static constexpr auto value =
lexy::as_list<std::vector<ast::NodePtr>> >>
lexy::callback<ast::NodePtr>(
[](const char* begin, lexy::nullopt, const char* end) {
return ast::make_node_ptr<ast::ListNode>(ast::NodeLocation::make_from(begin, end));
},
[](const char* begin, auto&& list, const char* end) {
return ast::make_node_ptr<ast::ListNode>(ast::NodeLocation::make_from(begin, end), LEXY_MOV(list));
},
[](const char* begin, lexy::nullopt, lexy::nullopt, const char* end) {
return ast::make_node_ptr<ast::ListNode>(ast::NodeLocation::make_from(begin, end));
},
[](const char* begin, auto&& list, lexy::nullopt, const char* end) {
return ast::make_node_ptr<ast::ListNode>(ast::NodeLocation::make_from(begin, end), LEXY_MOV(list));
},
[](const char* begin, auto& list, const char* end) {
return ast::make_node_ptr<ast::ListNode>(ast::NodeLocation::make_from(begin, end), list);
});
};
template<ParseOptions Options>
struct File {
// Allow arbitrary spaces between individual tokens.
static constexpr auto whitespace = whitespace_specifier | comment_specifier;
static constexpr auto rule = lexy::dsl::position + lexy::dsl::terminator(lexy::dsl::eof).opt_list(lexy::dsl::p<AssignmentStatement<Options>>);
static constexpr auto value = lexy::as_list<std::vector<ast::NodePtr>> >> lexy::new_<ast::FileNode, ast::NodePtr>;
};
}
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