From 1d4fd8e7306af64fc3f3473206eb7b2c0ba3c4c1 Mon Sep 17 00:00:00 2001
From: Jan Travnicek <Jan.Travnicek@fit.cvut.cz>
Date: Wed, 2 Aug 2017 13:44:01 +0200
Subject: [PATCH] add stub for help command in cli
---
alib2cli/src/command/HelpCommand.h | 45 ++++++++++++++++++++++++++++++
alib2cli/src/parser/Parser.cpp | 14 ++++++++++
alib2cli/src/parser/Parser.h | 2 ++
3 files changed, 61 insertions(+)
create mode 100644 alib2cli/src/command/HelpCommand.h
diff --git a/alib2cli/src/command/HelpCommand.h b/alib2cli/src/command/HelpCommand.h
new file mode 100644
index 0000000000..df9fcbf3bc
--- /dev/null
+++ b/alib2cli/src/command/HelpCommand.h
@@ -0,0 +1,45 @@
+#ifndef _CLI_HELP_COMMAND_H_
+#define _CLI_HELP_COMMAND_H_
+
+#include <command/Command.h>
+#include <environment/Environment.h>
+
+namespace cli {
+
+class HelpCommand : public Command {
+ std::string m_command;
+
+public:
+ HelpCommand ( std::string command ) : m_command ( std::move ( command ) ) {
+ }
+
+ virtual Command::Result run ( Environment & ) const override {
+ if ( m_command == "execute" ) {
+ std::cout << "Execute command executes statements and either prints the result or writes the result to a file" << std::endl;
+ } else if ( m_command == "export" ) {
+ std::cout << "Export command stores the result of statements in a variable" << std::endl;
+ std::cout << "" << std::endl;
+ std::cout << "Syntax:" << std::endl;
+ std::cout << "execute variable = statement_list" << std::endl;
+ std::cout << "" << std::endl;
+ std::cout << "variable is an identifier under which the result should be stored." << std::endl;
+ std::cout << "for details of syntax of statement_list see help of execute statement." << std::endl;
+ } else if ( m_command == "" ) {
+ std::cout << "Simple help for the query language" << std::endl;
+ std::cout << "" << std::endl;
+ std::cout << "command quit: quits the processor." << std::endl;
+ std::cout << "command help: shows this help." << std::endl;
+ std::cout << "command export: stores the result of statements into a variable" << std::endl;
+ std::cout << "command execute: executes statements" << std::endl;
+ std::cout << "" << std::endl;
+ std::cout << "for details use help of individual command" << std::endl;
+ } else {
+ std::cout << "The command " << m_command << " either does not exist or does not have a help entry." << std::endl;
+ }
+ return Command::Result::OK;
+ }
+};
+
+} /* namespace cli */
+
+#endif /* _CLI_HELP_COMMAND_H_ */
diff --git a/alib2cli/src/parser/Parser.cpp b/alib2cli/src/parser/Parser.cpp
index 7a0a666ef9..839fc620c9 100644
--- a/alib2cli/src/parser/Parser.cpp
+++ b/alib2cli/src/parser/Parser.cpp
@@ -19,6 +19,7 @@
#include <command/ExecuteCommand.h>
#include <command/ExportCommand.h>
#include <command/QuitCommand.h>
+#include <command/HelpCommand.h>
#include <primitive/Integer.h>
#include <primitive/String.h>
@@ -144,6 +145,14 @@ void Parser::result ( std::shared_ptr < StatementList > & list ) {
}
}
+std::string Parser::help_parameter ( ) {
+ if ( check ( cli::Lexer::TokenType::IDENTIFIER ) ) {
+ return matchIdentifier ( );
+ } else {
+ return "";
+ }
+}
+
std::unique_ptr < Command > Parser::parse ( ) {
if ( check_nonreserved_kw ( "execute" ) ) {
match_nonreserved_kw ( "execute" );
@@ -163,6 +172,11 @@ std::unique_ptr < Command > Parser::parse ( ) {
match_nonreserved_kw ( "quit" );
match ( cli::Lexer::TokenType::END );
return std::make_unique < QuitCommand > ( );
+ } else if ( check_nonreserved_kw ( "help" ) ) {
+ match_nonreserved_kw ( "help" );
+ std::string command = help_parameter ( );
+ match ( cli::Lexer::TokenType::END );
+ return std::make_unique < HelpCommand > ( std::move ( command ) );
} else {
throw exception::CommonException ( "Mismatched set while expanding param rule." );
}
diff --git a/alib2cli/src/parser/Parser.h b/alib2cli/src/parser/Parser.h
index 96501c3ae9..61ba5be85b 100644
--- a/alib2cli/src/parser/Parser.h
+++ b/alib2cli/src/parser/Parser.h
@@ -84,6 +84,8 @@ public:
void result ( std::shared_ptr < StatementList > & list );
+ std::string help_parameter ( );
+
std::unique_ptr < Command > parse ( );
};
--
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