Util: Add JSON Job class

This class holds the to parse string and has a helper for printing error
messages.

src/util/json/job.cpp

@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2022 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <sstream> // istringstream
+#include <string>  // getline
+
+#include "util/json/job.h"
+
+namespace Json {
+
+Job::Job(const std::string& input)
+	: m_input(input)
+{
+}
+
+Job::~Job()
+{
+}
+
+// ------------------------------------------
+
+void Job::printErrorLine(Token token, const char* message)
+{
+	// Error message
+	std::string errorFormat = "\033[;1m" // Bold
+							  "JSON:%zu:%zu: "
+							  "\033[31;1m" // Bold red
+							  "error: "
+							  "\033[0m" // Reset
+							  "%s"
+							  "\n";
+	printf(errorFormat.c_str(),
+	       token.line,
+	       token.column,
+	       message);
+
+	// Get the JSON line that caused the error
+	std::istringstream input(m_input);
+	std::string line;
+	size_t count = 0;
+	while (std::getline(input, line)) {
+		count++;
+		if (count == token.line) {
+			break;
+		}
+	}
+
+	// JSON line
+	std::string lineFormat = " %"
+	                         + std::to_string(m_lineNumbersWidth)
+	                         + "zu | "
+	                           "%s"
+	                           "\033[31;1m" // Bold red
+	                           "%s"
+	                           "\033[0m" // Reset
+	                           "\n";
+	printf(lineFormat.c_str(),
+	       token.line,
+	       line.substr(0, token.column - 1).c_str(),
+	       line.substr(token.column - 1).c_str());
+
+	// Arrow pointer
+	std::string arrowFormat = " %s | "
+							  "\033[31;1m" // Bold red
+							  "%s^%s"
+							  "\033[0m" // Reset
+							  "\n";
+	printf(arrowFormat.c_str(),
+	       std::string(m_lineNumbersWidth, ' ').c_str(),
+	       std::string(token.column - 1, ' ').c_str(),
+	       std::string(line.length() - token.column, '~').c_str());
+}
+
+} // namespace Json

src/util/json/job.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2022 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#ifndef JSON_JOB_H
+#define JSON_JOB_H
+
+#include <cstddef> // size_t
+#include <string>
+
+#include "util/json/lexer.h"
+
+namespace Json {
+
+class Job {
+public:
+	Job(const std::string& input);
+	virtual ~Job();
+
+	enum class Color {
+		None,
+		Info,
+		Warn,
+		Danger,
+		Success,
+		Comment,
+	};
+
+	void printErrorLine(Token token, const char* message);
+
+	void setLineNumbersWidth(size_t width) { m_lineNumbersWidth = width; }
+
+	const std::string& input() { return m_input; }
+
+private:
+	std::string m_input;
+	size_t m_lineNumbersWidth { 0 };
+};
+
+} // namespace Json
+
+#endif // JSON_JOB_H