code_compiler: Implement Lexer for Blitz
The Lexer should now be able to parse all existing Blitz code into easily identified Tokens. With this information, a Parser can now verify that the syntax was kept correctly, warn about possible dangerous or wrong use and convert the Tokens into actual LLVM code for compiling.
This commit is contained in:
Michael Fabian 'Xaymar' Dirks
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// Code Compiler for BlitzLLVM
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// Copyright(C) 2017 Michael Fabian Dirks
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//
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// This program is free software : you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program.If not, see <https://www.gnu.org/licenses/>.
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#include "lexer.hpp"
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#include <codecvt>
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char g_whitespaceCharacters[] = {
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' ',
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'\t',
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};
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std::pair<char, BlitzLLVM::Lexer::Token> g_symbolCharacters[] = {
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//{ '\"', BlitzLLVM::Lexer::Token::TokenDoubleQuote }, // Has special meaning.
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{ '+', BlitzLLVM::Lexer::Token::TokenPlus },
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{ '-', BlitzLLVM::Lexer::Token::TokenMinus },
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{ '/', BlitzLLVM::Lexer::Token::TokenSlashForward },
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{ '\\', BlitzLLVM::Lexer::Token::TokenSlashBackward },
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{ '*', BlitzLLVM::Lexer::Token::TokenMultiply },
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{ '=', BlitzLLVM::Lexer::Token::TokenEqual },
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{ '#', BlitzLLVM::Lexer::Token::TokenOctothorp },
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{ '%', BlitzLLVM::Lexer::Token::TokenPercent },
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{ '$', BlitzLLVM::Lexer::Token::TokenDollar },
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{ '(', BlitzLLVM::Lexer::Token::TokenRoundBracketOpen },
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{ ')', BlitzLLVM::Lexer::Token::TokenRoundBracketClose },
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{ '[', BlitzLLVM::Lexer::Token::TokenSquareBracketOpen },
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{ ']', BlitzLLVM::Lexer::Token::TokenSquareBracketClose },
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{ '<', BlitzLLVM::Lexer::Token::TokenAngleBracketOpen },
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{ '>', BlitzLLVM::Lexer::Token::TokenAngleBracketClose },
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//{ '.', BlitzLLVM::Lexer::Token::TokenDot }, // Special meaning.
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{ ':', BlitzLLVM::Lexer::Token::TokenColon },
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{ ',', BlitzLLVM::Lexer::Token::TokenComma },
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{ ';', BlitzLLVM::Lexer::Token::TokenSemicolon },
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{ '^', BlitzLLVM::Lexer::Token::TokenCaret },
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{ '~', BlitzLLVM::Lexer::Token::TokenBitNot },
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};
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BlitzLLVM::Lexer::Lexer(std::istream& fs) : m_fileStream(fs) {}
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BlitzLLVM::Lexer::~Lexer() {}
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std::pair<BlitzLLVM::Lexer::Token, std::string> BlitzLLVM::Lexer::GetNextToken() {
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std::string buf;
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Token tkn = Token::TokenEOF;
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bool haveResult = false;
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// Allow "overriding" the next retrieved Token.
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if (m_overrideToken != Token::TokenUnknown) {
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buf = m_overrideText;
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tkn = m_overrideToken;
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m_overrideToken = Token::TokenUnknown;
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haveResult = true;
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}
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while (((m_fileStream.eof() == false) && (m_fileStream.good())) && !haveResult) {
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char chr = m_fileStream.get();
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if (chr == '\r' || chr == '\n') {
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if (tkn != Token::TokenEOF) {
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m_overrideToken = Token::TokenNewLine;
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m_overrideText = "";
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} else {
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tkn = Token::TokenNewLine;
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buf = "";
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}
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m_isStringMode = false;
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m_isNumberMode = false;
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m_isTextMode = false;
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break;
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} else if (!m_isStringMode && !m_isTextMode && !m_isNumberMode) {
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// Whitespace
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bool isWhitespace = false;
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for (char v : g_whitespaceCharacters) {
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if (v == chr) {
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isWhitespace = true;
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break;
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}
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}
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if (isWhitespace)
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continue;
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// Symbol
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for (auto v : g_symbolCharacters) {
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if (v.first == chr) {
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tkn = v.second;
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buf = v.first;
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break;
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}
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}
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if (tkn != Token::TokenEOF) {
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haveResult = true;
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break;
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}
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// Strings, Text, Numbers
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if (chr == '\"') {
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m_isStringMode = true;
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tkn = Token::TokenDoubleQuote;
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buf = chr;
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break;
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} else if (isalpha(chr)) {
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m_isTextMode = true;
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tkn = Token::TokenText;
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buf = chr;
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} else if (isdigit(chr)) {
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m_isNumberMode = true;
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m_numberModeHasDecimal = false;
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tkn = Token::TokenNumber;
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buf = chr;
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} else if (chr == '.') {
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m_isNumberMode = true;
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m_numberModeHasDecimal = true;
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tkn = Token::TokenDecimal;
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buf = "0" + chr;
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} else {
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tkn = Token::TokenUnknown;
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buf = chr;
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break;
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}
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} else if (m_isStringMode) {
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if (chr == '\"') {
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m_overrideToken = Token::TokenDoubleQuote;
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m_overrideText = chr;
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m_isStringMode = false;
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tkn = Token::TokenQuotedText;
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break;
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} else {
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buf += chr;
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}
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} else if (m_isTextMode) {
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if (isalnum(chr) || (chr == '_')) {
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buf += chr;
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} else {
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m_fileStream.putback(chr);
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m_isTextMode = false;
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break;
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}
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} else if (m_isNumberMode) {
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if (isdigit(chr)) {
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buf += chr;
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} else if (chr == '.') {
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if (m_numberModeHasDecimal == false) {
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m_numberModeHasDecimal = true;
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tkn = Token::TokenDecimal;
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buf += chr;
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} else {
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throw std::runtime_error("Unexpected '.' while parsing number.");
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}
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} else {
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m_fileStream.putback(chr);
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m_isNumberMode = false;
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break;
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}
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}
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}
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return std::make_pair(tkn, buf);
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}
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@@ -0,0 +1,126 @@
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// Code Compiler for BlitzLLVM
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// Copyright(C) 2017 Michael Fabian Dirks
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//
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// This program is free software : you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program.If not, see <https://www.gnu.org/licenses/>.
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#pragma once
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#include <list>
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#include <istream>
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#include <string>
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#include <inttypes.h>
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namespace BlitzLLVM {
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class Lexer {
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public:
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enum class Token : uint64_t {
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TokenUnknown,
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TokenEOF,
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TokenNewLine,
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// Symbols
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TokenPlus,
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TokenMinus,
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TokenSlashForward,
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TokenSlashBackward,
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TokenMultiply,
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TokenEqual,
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TokenOctothorp,
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TokenPercent,
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TokenDollar,
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TokenRoundBracketOpen,
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TokenRoundBracketClose,
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TokenSquareBracketOpen,
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TokenSquareBracketClose,
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TokenAngleBracketOpen,
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TokenAngleBracketClose,
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TokenDot,
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TokenColon,
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TokenComma,
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TokenSemicolon,
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TokenCaret,
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TokenBitNot /*~*/,
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// String Delimiter
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TokenDoubleQuote,
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// Types
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TokenText,
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TokenNumber,
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TokenDecimal,
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TokenQuotedText, // Text encapsulated by TokenDoubleQuote
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// Binary
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TokenNot,
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TokenAnd, TokenOr, TokenXor,
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TokenShl, TokenShr,
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TokenSar, TokenSal,
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TokenFalse, TokenTrue,
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// Conversion
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TokenFloat,
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TokenString, TokenHex,
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TokenInt,
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// Control
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TokenIf, TokenThen, TokenElseIf, TokenElse, TokenEndIf,
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TokenSelect, TokenCase, TokenDefault, // End Select = TokenEnd, TokenSelect.
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TokenGoto, TokenGosub,
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TokenReturn,
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TokenFunction, // End Function = TokenEnd, TokenFunction.
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TokenEnd,
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TokenStop /* DEBUGGER! Ignore in Release mode. */,
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// Loop
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TokenFor, TokenTo, TokenNext,
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TokenWhile, TokenWend,
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TokenRepeat, TokenUntil, TokenForever,
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TokenExit,
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// Math
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TokenAbs, TokenSign /*Sgn*/,
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TokenCos, TokenSin, TokenTan,
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TokenACos, TokenASin, TokenATan, TokenATan2,
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TokenLog, TokenLog10,
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TokenCeil, TokenFloor,
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TokenMod,
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TokenPi,
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TokenExp, TokenSqr,
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// Variables
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TokenConst,
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TokenGlobal,
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TokenLocal,
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// Including files.
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TokenInclude,
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};
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public:
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Lexer(std::istream& fs);
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~Lexer();
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std::pair<Token, std::string> GetNextToken();
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private:
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std::istream& m_fileStream;
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bool m_isTextMode = false;
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bool m_isNumberMode = false;
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bool m_isStringMode = false;
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bool m_numberModeHasDecimal = false;
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Token m_overrideToken = Token::TokenUnknown;
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std::string m_overrideText = "";
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};
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}
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