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/*
Please use git log for copyright holder and year information
This file is part of libbash.
libbash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
libbash 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with libbash. If not, see <http://www.gnu.org/licenses/>.
*/
///
/// \file bash_ast.cpp
/// \brief a wrapper class that helps interpret from istream and string
///
#include <fstream>
#include "core/interpreter_exception.h"
#include "libbashLexer.h"
#include "libbashParser.h"
#include "core/bash_ast.h"
bash_ast::bash_ast(const std::istream& source,
std::function<pANTLR3_BASE_TREE(plibbashParser)> p): parse(p)
{
std::stringstream stream;
stream << source.rdbuf();
script = stream.str();
init_parser(script, "unknown source");
}
bash_ast::bash_ast(const std::string& script_path,
std::function<pANTLR3_BASE_TREE(plibbashParser)> p): parse(p)
{
std::stringstream stream;
std::ifstream file_stream(script_path);
if(!file_stream)
throw interpreter_exception(script_path + " can't be read");
stream << file_stream.rdbuf();
script = stream.str();
init_parser(script, script_path);
}
bash_ast::~bash_ast()
{
nodes->free(nodes);
parser->free(parser);
token_stream->free(token_stream);
lexer->free(lexer);
input->close(input);
}
void bash_ast::init_parser(const std::string& script, const std::string& script_path)
{
input = antlr3NewAsciiStringInPlaceStream(
reinterpret_cast<pANTLR3_UINT8>(const_cast<char*>(script.c_str())),
script.size(),
NULL);
if(input == NULL)
throw interpreter_exception("Unable to open file " + script + " due to malloc() failure");
input->fileName = input->strFactory->newStr(
input->strFactory,
reinterpret_cast<pANTLR3_UINT8>(const_cast<char*>(script_path.c_str())));
lexer = libbashLexerNew(input);
if ( lexer == NULL )
{
std::cerr << "Unable to create the lexer due to malloc() failure" << std::endl;
error_count = 1;
return;
}
token_stream = antlr3CommonTokenStreamSourceNew(
ANTLR3_SIZE_HINT, lexer->pLexer->rec->state->tokSource);
if (token_stream == NULL)
{
std::cerr << "Out of memory trying to allocate token stream" << std::endl;
error_count = 1;
return;
}
parser = libbashParserNew(token_stream);
if (parser == NULL)
{
std::cerr << "Out of memory trying to allocate parser" << std::endl;
error_count = 1;
return;
}
ast = parse(parser);
error_count = parser->pParser->rec->getNumberOfSyntaxErrors(parser->pParser->rec);
nodes = antlr3CommonTreeNodeStreamNewTree(ast, ANTLR3_SIZE_HINT);
}
std::string bash_ast::get_dot_graph()
{
pANTLR3_STRING graph = nodes->adaptor->makeDot(nodes->adaptor, ast);
return std::string(reinterpret_cast<char*>(graph->chars));
}
std::string bash_ast::get_string_tree()
{
return std::string(reinterpret_cast<char*>(ast->toStringTree(ast)->chars));
}
namespace
{
void print_line_counter(std::stringstream& result,
pANTLR3_COMMON_TOKEN token,
int& line_counter,
int pos)
{
char* text = reinterpret_cast<char*>(token->getText(token)->chars);
for(int i = pos; text[i] == '\n'; ++i)
result << '\n' << line_counter++ << "\t";
}
}
std::string bash_ast::get_tokens(std::function<std::string(ANTLR3_INT32)> token_map)
{
std::stringstream result;
int line_counter = 1;
// output line number for the first line
result << line_counter++ << "\t";
pANTLR3_VECTOR token_list = token_stream->getTokens(token_stream);
unsigned token_size = token_list->size(token_list);
for(unsigned i = 0; i != token_size; ++i)
{
pANTLR3_COMMON_TOKEN token = reinterpret_cast<pANTLR3_COMMON_TOKEN>
(token_list->get(token_list, i));
std::string tokenName = token_map(token->getType(token));
if(tokenName != "EOL" && tokenName != "COMMENT" && tokenName != "CONTINUE_LINE")
{
result << tokenName << " ";
}
// Output \n and line number before each COMMENT token for better readability
else if(tokenName == "COMMENT")
{
print_line_counter(result, token, line_counter, 0);
result << tokenName;
}
// Output \n and line number after each CONTINUE_LINE/EOL token for better readability
// omit the last \n and line number
else if(i + 1 != token_size)
{
result << tokenName;
print_line_counter(result, token, line_counter, tokenName == "CONTINUE_LINE"? 1 : 0);
}
}
return result.str();
}
void bash_ast::walker_start(plibbashWalker tree_parser)
{
tree_parser->start(tree_parser);
}
int bash_ast::walker_arithmetics(plibbashWalker tree_parser)
{
return tree_parser->arithmetics(tree_parser);
}
pANTLR3_BASE_TREE bash_ast::parser_start(plibbashParser parser)
{
return parser->start(parser).tree;
}
pANTLR3_BASE_TREE bash_ast::parser_arithmetics(plibbashParser parser)
{
return parser->arithmetics(parser).tree;
}
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