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#pragma once
#include <openvic-dataloader/NodeLocation.hpp>
#include <openvic-dataloader/v2script/AbstractSyntaxTree.hpp>
#include <lexy/callback.hpp>
#include <lexy/dsl.hpp>
#include <lexy/dsl/identifier.hpp>
#include <lexy/dsl/symbol.hpp>
#include "ParseState.hpp"
#include "detail/dsl.hpp"
// Grammar Definitions //
/* REQUIREMENTS:
* DAT-626
* DAT-627
* DAT-628
* DAT-636
* DAT-641
* DAT-642
* DAT-643
*/
namespace ovdl::v2script::grammar {
template<typename T>
constexpr auto construct = dsl::construct<ast::ParseState, T>;
template<typename T, bool DisableEmpty = false, typename ListType = ast::AssignStatementList>
constexpr auto construct_list = dsl::construct_list<ast::ParseState, T, ListType, DisableEmpty>;
struct ParseOptions {
/// @brief Makes string parsing avoid string escapes
bool NoStringEscape;
};
static constexpr ParseOptions NoStringEscapeOption = ParseOptions { true };
static constexpr ParseOptions StringEscapeOption = ParseOptions { false };
/* 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();
static constexpr auto ascii = lexy::dsl::ascii::alpha_digit_underscore / LEXY_ASCII_ONE_OF("+:@%&'-.");
/* REQUIREMENTS:
* DAT-632
* DAT-635
*/
static constexpr auto windows_1252_data_specifier =
ascii /
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> /
dsl::make_range<0x9E, 0x9F>() /
dsl::make_range<0xC0, 0xD6>() /
dsl::make_range<0xD8, 0xF6>() /
dsl::make_range<0xF8, 0xFF>();
static constexpr auto windows_1251_data_specifier_additions =
dsl::make_range<0x80, 0x81>() / lexy::dsl::lit_b<0x83> / lexy::dsl::lit_b<0x8D> / lexy::dsl::lit_b<0x8F> /
lexy::dsl::lit_b<0x90> / lexy::dsl::lit_b<0x9D> / lexy::dsl::lit_b<0x9F> /
dsl::make_range<0xA1, 0xA3>() / lexy::dsl::lit_b<0xA5> / lexy::dsl::lit_b<0xA8> / lexy::dsl::lit_b<0xAA> /
lexy::dsl::lit_b<0xAF> /
dsl::make_range<0xB2, 0xB4>() / lexy::dsl::lit_b<0xB8> / lexy::dsl::lit_b<0xBA> /
dsl::make_range<0xBC, 0xBF>() /
lexy::dsl::lit_b<0xD7> / lexy::dsl::lit_b<0xF7>;
static constexpr auto data_specifier = windows_1252_data_specifier / windows_1251_data_specifier_additions;
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');
static constexpr auto id = lexy::dsl::identifier(data_char_class);
template<ParseOptions Options>
struct SimpleGrammar {
struct StatementListBlock;
struct Identifier {
static constexpr auto rule = lexy::dsl::identifier(data_char_class);
static constexpr auto value = dsl::callback<ast::IdentifierValue*>(
[](ast::ParseState& state, auto lexeme) {
auto value = state.ast().intern(lexeme.data(), lexeme.size());
return state.ast().create<ast::IdentifierValue>(ovdl::NodeLocation::make_from(lexeme.begin(), lexeme.end()), value);
});
};
/* REQUIREMENTS:
* DAT-633
* DAT-634
*/
struct StringExpression {
static constexpr auto rule = [] {
if constexpr (Options.NoStringEscape) {
auto c = dsl::make_range<0x20, 0xFF>() / lexy::dsl::lit_b<0x07> / lexy::dsl::lit_b<0x09> / lexy::dsl::lit_b<0x0A> / lexy::dsl::lit_b<0x0D>;
return lexy::dsl::delimited(lexy::dsl::position(lexy::dsl::lit_b<'"'>))(c);
} else {
// Arbitrary code points that aren't control characters.
auto c = dsl::make_range<0x20, 0xFF>() - lexy::dsl::ascii::control;
// 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> >>
dsl::callback<ast::StringValue*>(
[](ast::ParseState& state, const char* begin, auto&& str, const char* end) {
auto value = state.ast().intern(str.data(), str.length());
return state.ast().create<ast::StringValue>(ovdl::NodeLocation::make_from(begin, end), value);
});
};
/* REQUIREMENTS: DAT-638 */
struct ValueExpression {
static constexpr auto rule = lexy::dsl::p<Identifier> | lexy::dsl::p<StringExpression>;
static constexpr auto value = lexy::forward<ast::Value*>;
};
struct SimpleAssignmentStatement {
static constexpr auto rule =
dsl::p<Identifier> >>
(lexy::dsl::equal_sign >>
(lexy::dsl::p<ValueExpression> | lexy::dsl::recurse_branch<StatementListBlock>));
static constexpr auto value = construct<ast::AssignStatement>;
};
/* REQUIREMENTS: DAT-639 */
struct AssignmentStatement {
static constexpr auto rule =
dsl::p<Identifier> >>
(lexy::dsl::equal_sign >>
(lexy::dsl::p<ValueExpression> | lexy::dsl::recurse_branch<StatementListBlock>) |
lexy::dsl::else_ >> lexy::dsl::return_) |
dsl::p<StringExpression> |
lexy::dsl::recurse_branch<StatementListBlock>;
static constexpr auto value = dsl::callback<ast::Statement*>(
[](ast::ParseState& state, const char* pos, ast::IdentifierValue* name, ast::Value* initializer) {
return state.ast().create<ast::AssignStatement>(pos, name, initializer);
},
[](ast::ParseState& state, const char* pos, ast::Value* left, lexy::nullopt = {}) {
return state.ast().create<ast::ValueStatement>(pos, left);
},
[](ast::ParseState& state, ast::Value* left) {
return state.ast().create<ast::ValueStatement>(state.ast().location_of(left), left);
});
};
/* REQUIREMENTS: DAT-640 */
struct StatementListBlock {
static constexpr auto rule =
dsl::curly_bracketed(
(lexy::dsl::opt(lexy::dsl::list(lexy::dsl::recurse_branch<AssignmentStatement>)) +
lexy::dsl::opt(lexy::dsl::semicolon)));
static constexpr auto value =
lexy::as_list<ast::StatementList> >>
dsl::callback<ast::ListValue*>(
[](ast::ParseState& state, const char* begin, auto&& list, const char* end) {
if constexpr (std::is_same_v<std::decay_t<decltype(list)>, lexy::nullopt>) {
return state.ast().create<ast::ListValue>(ovdl::NodeLocation::make_from(begin, end));
} else {
return state.ast().create<ast::ListValue>(ovdl::NodeLocation::make_from(begin, end), LEXY_MOV(list));
}
},
[](ast::ParseState& state, const char* begin, auto&& list, auto&& semicolon, const char* end) {
if constexpr (std::is_same_v<std::decay_t<decltype(list)>, lexy::nullopt>) {
return state.ast().create<ast::ListValue>(ovdl::NodeLocation::make_from(begin, end));
} else {
return state.ast().create<ast::ListValue>(ovdl::NodeLocation::make_from(begin, end), LEXY_MOV(list));
}
});
};
};
template<ParseOptions Options>
using StringExpression = typename SimpleGrammar<Options>::StringExpression;
template<ParseOptions Options>
using Identifier = typename SimpleGrammar<Options>::Identifier;
template<ParseOptions Options>
using SAssignStatement = typename SimpleGrammar<Options>::SimpleAssignmentStatement;
template<ovdl::detail::string_literal Keyword, auto Production, auto Value = dsl::default_kw_value<ast::ParseState, ast::IdentifierValue, Keyword>>
using keyword_rule = dsl::keyword_rule<
ast::ParseState,
id,
ast::AssignStatement,
Keyword, Production, Value>;
template<ovdl::detail::string_literal Keyword, auto Production, auto Value = dsl::default_kw_value<ast::ParseState, ast::IdentifierValue, Keyword>>
using fkeyword_rule = dsl::fkeyword_rule<
ast::ParseState,
id,
ast::AssignStatement,
Keyword, Production, Value>;
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<typename SimpleGrammar<Options>::AssignmentStatement>));
static constexpr auto value = lexy::as_list<ast::StatementList> >> construct<ast::FileTree>;
};
}
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