Add Markdown parser

Added initial C++ Markdown support.

Makefile

@@ -24,8 +24,8 @@ CXXFLAGS=-Wall -Wextra -g -O0 -std=c++17
 
 .PHONY: clean
 
-$(PROGRAM_NAME): build/ build/obj/ build/obj/main.o build/obj/ConfigUtils.o build/obj/WebsiteBuilder.o build/obj/SwgRuntime.o
+$(PROGRAM_NAME): build/ build/obj/ build/obj/main.o build/obj/ConfigUtils.o build/obj/WebsiteBuilder.o build/obj/SwgRuntime.o build/obj/MarkdownParser.o
-	$(CXXC) -o $(PROGRAM_NAME) build/obj/main.o build/obj/ConfigUtils.o build/obj/WebsiteBuilder.o build/obj/SwgRuntime.o
+	$(CXXC) -o $(PROGRAM_NAME) build/obj/main.o build/obj/ConfigUtils.o build/obj/WebsiteBuilder.o build/obj/SwgRuntime.o build/obj/MarkdownParser.o
 
 build/obj/main.o: src/main.cxx src/ConfigUtils.hxx src/SwgContext.hxx src/WebsiteBuilder.hxx src/Common.hxx
 	$(CXXC) $(CXXFLAGS) -o build/obj/main.o -c src/main.cxx
@@ -33,12 +33,15 @@ build/obj/main.o: src/main.cxx src/ConfigUtils.hxx src/SwgContext.hxx src/Websit
 build/obj/ConfigUtils.o: src/ConfigUtils.cxx src/SwgContext.hxx src/Common.hxx
 	$(CXXC) $(CXXFLAGS) -o build/obj/ConfigUtils.o -c src/ConfigUtils.cxx
 
-build/obj/WebsiteBuilder.o: src/WebsiteBuilder.hxx src/WebsiteBuilder.cxx src/SwgRuntime.hxx src/Common.hxx
+build/obj/WebsiteBuilder.o: src/WebsiteBuilder.hxx src/WebsiteBuilder.cxx src/SwgRuntime.hxx src/Common.hxx src/MarkdownParser.hxx
 	$(CXXC) $(CXXFLAGS) -o build/obj/WebsiteBuilder.o -c src/WebsiteBuilder.cxx
 
 build/obj/SwgRuntime.o: src/SwgRuntime.hxx src/SwgRuntime.cxx
 	$(CXXC) $(CXXFLAGS) -o build/obj/SwgRuntime.o -c src/SwgRuntime.cxx
 
+build/obj/MarkdownParser.o: src/MarkdownParser.hxx src/MarkdownParser.cxx
+	$(CXXC) $(CXXFLAGS) -o build/obj/MarkdownParser.o -c src/MarkdownParser.cxx
+
 build/:
 	mkdir -p build/
 

src/MarkdownParser.cxx

@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2022 luca0N!
+ *
+ * This file is part of Static Website Generator (swg).
+ *
+ * Static Website Generator (swg) is free software: you can redistribute it
+ * and/or modify it under the terms of the version 3 of the GNU Lesser General
+ * Public License as published by the Free Software Foundation.
+ *
+ * Static Website Generator (swg) is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Static Website Generator (swg). If not, see
+ * <https://www.gnu.org/licenses/>.
+ *
+ * Contact luca0N! by e-mail: <luca0n [at] luca0n [dot] com>. 
+ */
+
+#include "MarkdownParser.hxx"
+
+#include <assert.h>
+
+#define ASCII_DIGIT_START	48
+
+namespace MarkdownParser {
+
+std::string make_html(std::filesystem::path const &path) {
+	FILE *mdFile = fopen(path.string().c_str(), "r");
+	// TODO: Add proper error handling.
+	assert(mdFile != NULL);
+
+	std::string html;
+
+	int buflen = 64;
+	char buf[buflen];
+
+	// Tag flags
+	bool tag_b = false,
+	     tag_i = false,
+	     // If there is an escape character at the end of the buffer, use
+	     // this flag to prevent ignoring it.
+	     escaping = false,
+	     newline = true,
+	     manualBreak = false,
+	     // Used to ignore spaces at the beginning of header titles.
+	     ignoreSpace = false;
+
+	// For counting sub-headers (h1, h2, h3, and so on)
+	int tag_h = 0;
+	while (fgets(buf, buflen, mdFile) != NULL) {
+		manualBreak = false;
+		// Read character by character
+		for (int x = 0; x < buflen; x++) {
+			char c = buf[x];
+			if (c == '\0') break;
+			else if (c == '\n') {
+				// The next buffer iteration will hold the
+				// first (buflen) bytes of the next new line.
+				newline = true;
+				manualBreak = true;
+
+				// If we were in the middle of inserting a header tag, close it here.
+				if (tag_h > 0) {
+					html += "</h";
+					html += (ASCII_DIGIT_START + tag_h);
+					html += ">";
+					tag_h = 0;
+				}
+				html += '\n';
+				break;
+			}
+			switch (c) {
+				case '*':
+					// Bold check
+					// Check whether this character has been escaped.
+					if (buf[x-1] == '\\') {
+						html += "*";
+						break;
+					}
+
+					html += tag_b ? "</b>" : "<b>";
+					tag_b = !tag_b;
+					break;
+				case '_':
+					// Italics check
+					
+					// Check whether this character has
+					// been escaped.
+					
+					if (buf[x-1] == '\\') {
+						html += "_";
+						break;
+					}
+
+					html += tag_i ? "</i>" : "<i>";
+					tag_i = !tag_i;
+					break;
+				case '#':
+					// Header check
+
+					// Headers must be declared at the
+					// beginning of a new line. Ignore it
+					// if this is not a new line.
+					if (!newline) {
+						html += "#";
+						break;
+					}
+
+					// Check whether this character has
+					// been escaped.
+					if (buf[x-1] == '\\' ||
+					// Check if this header was specified
+					// right at the beginning of the line.
+					    (tag_h == 0 && x != 0)) {
+						html += "#";
+						break;
+					}
+
+					// This seems like a header
+					// declaration.
+					//
+					// Increase the header count (for
+					// subheader support) and add it to the
+					// HTML output.
+					//
+					// Support up to 6 levels of headers.
+					// After that, ignore '#' characters
+					// and add them directly to the HTML
+					// output.
+					if (tag_h >= 6) {
+						html += "<h";
+						html += (ASCII_DIGIT_START + tag_h);
+						html += ">";
+						html += '#';
+						ignoreSpace = true;
+						break;
+					} else tag_h++;
+
+					// If we are done reading header
+					// characters, finally add the tag and
+					// then move on.
+
+					if (buf[x+1] != '#') {
+						html += "<h";
+						html += (ASCII_DIGIT_START + tag_h);
+						html += ">";
+						ignoreSpace = true;
+						break;
+					}
+
+					break;
+				case ' ':
+					if (ignoreSpace) {
+						ignoreSpace = false;
+						break;
+					} else html += ' ';
+					break;
+				default:
+					html += c;
+					break;
+			}
+		}
+		if (!manualBreak) newline = false;
+	}
+
+	fclose(mdFile);
+	return html;
+}
+
+};

src/MarkdownParser.hxx

@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2022 luca0N!
+ *
+ * This file is part of Static Website Generator (swg).
+ *
+ * Static Website Generator (swg) is free software: you can redistribute it
+ * and/or modify it under the terms of the version 3 of the GNU Lesser General
+ * Public License as published by the Free Software Foundation.
+ *
+ * Static Website Generator (swg) is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Static Website Generator (swg). If not, see
+ * <https://www.gnu.org/licenses/>.
+ *
+ * Contact luca0N! by e-mail: <luca0n [at] luca0n [dot] com>. 
+ */
+
+#pragma once
+
+#include <string>
+#include <filesystem>
+
+namespace MarkdownParser {
+	std::string make_html(std::filesystem::path const &path);
+};
+