| 38 | namespace endstone::core { |
| 39 | |
| 40 | nonstd::expected<CommandUsageParser::Result, std::string> CommandUsageParser::parse() noexcept |
| 41 | { |
| 42 | Result result; |
| 43 | lexer_.reset(); |
| 44 | |
| 45 | // Expect a slash at the start. |
| 46 | if (auto slash = parseToken(CommandLexer::TokenType::Slash, "/"); !slash) { |
| 47 | return nonstd::make_unexpected(slash.error()); |
| 48 | } |
| 49 | |
| 50 | // Parse command name. |
| 51 | auto command_name_result = parseIdentifier("command name"); |
| 52 | if (!command_name_result) { |
| 53 | return nonstd::make_unexpected(command_name_result.error()); |
| 54 | } |
| 55 | result.command_name = std::string(command_name_result.value()); |
| 56 | command_name_ = result.command_name; |
| 57 | |
| 58 | // Parse parameters (or enums). |
| 59 | while (true) { |
| 60 | auto token = lexer_.peek(); |
| 61 | switch (token.type) { |
| 62 | case CommandLexer::TokenType::Identifier: { |
| 63 | auto enum_result = parseSingleUnnamedEnum(); |
| 64 | if (!enum_result) { |
| 65 | return nonstd::make_unexpected(enum_result.error()); |
| 66 | } |
| 67 | result.parameters.push_back(enum_result.value()); |
| 68 | break; |
| 69 | } |
| 70 | case CommandLexer::TokenType::LeftParen: { |
| 71 | auto enum_result = parseEnum(); |
| 72 | if (!enum_result) { |
| 73 | return nonstd::make_unexpected(enum_result.error()); |
| 74 | } |
| 75 | result.parameters.push_back(enum_result.value()); |
| 76 | break; |
| 77 | } |
| 78 | case CommandLexer::TokenType::LeftSquare: |
| 79 | case CommandLexer::TokenType::LessThan: { |
| 80 | auto param_result = parseParameterOrEnum(); |
| 81 | if (!param_result) { |
| 82 | return nonstd::make_unexpected(param_result.error()); |
| 83 | } |
| 84 | result.parameters.push_back(param_result.value()); |
| 85 | break; |
| 86 | } |
| 87 | case CommandLexer::TokenType::End: |
| 88 | return result; |
| 89 | default: |
| 90 | return nonstd::make_unexpected(fmt::format("Syntax Error: expect '(', '<' or '[', got '{}' at position {}.", |
| 91 | token.value, lexer_.getPosition())); |
| 92 | } |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | nonstd::expected<std::string_view, std::string> CommandUsageParser::parseToken(CommandLexer::TokenType type, |
| 97 | std::string what) |