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102 lines
2.8 KiB
C++
102 lines
2.8 KiB
C++
/**
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* lisp-compiler: Compiles LISP using LLVM.
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* Copyright (C) 2022 Clyne Sullivan
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*
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* This program is free software: you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @file parser.hpp
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* @brief Source code parser to produce AST.
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*/
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#ifndef PARSER_HPP
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#define PARSER_HPP
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#include "ast.hpp"
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#include <deque>
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#include <optional>
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#include <string>
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#include <variant>
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class Parser {
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public:
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enum Error {
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ExpectedProcedureCallOpen,
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ExpectedIdentifier,
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ExpectedProcedureCallClose,
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ExpectedArgumentList,
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UnknownIdentifier,
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InvalidExpression,
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InvalidOperand,
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InvalidCondition,
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InvalidThenBranch,
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InvalidElseBranch,
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InvalidInitializer,
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InvalidAssignValue,
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InvalidArgumentName,
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InvalidLambdaBody
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};
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/**
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* Appends the given string to the end of the text queue.
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* Call parse() after adding text to produce the AST.
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*/
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void addString(const std::string&);
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/**
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* Attempts to parse all text in the text queue, stopping if there is an
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* error.
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* @return An iterable collection of produced AST nodes.
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*/
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std::deque<AST::Node *> parse();
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std::string describeErrors() noexcept;
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bool hasErrors() const noexcept {
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return !errors.empty();
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}
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private:
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std::deque<char> text;
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std::deque<Error> errors;
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/**
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* Advances through the text queue until a non-whitespace character is
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* found.
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*/
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void consumeWhitespace() noexcept;
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/**
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* Attempts to consume an identifier from the text queue.
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* @return A string containing the identifier if one is found.
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*/
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std::optional<std::string> consumeIdentifier() noexcept;
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/**
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* Attempts to consume a literal number from the text queue.
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* @return The number if one is found: an integer if there is no decimal
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* point; otherwise, a double.
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* TODO Ensure and add noexcept.
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*/
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std::optional<std::variant<int, double>> consumeLiteralNumber();
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AST::Node *parseExpression();
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AST::Node *parseProcedureCall();
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AST::Node *parseConditional();
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AST::Node *parseDefinition();
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AST::Node *parseAssignment();
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AST::Node *parseLambdaExpression();
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};
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#endif // PARSER_HPP
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