blog-static/code/compiler/13/parse_driver.hpp

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#pragma once
#include <string>
#include <fstream>
#include <sstream>
#include "definition.hpp"
#include "location.hh"
#include "parser.hpp"
struct parse_driver;
void scanner_init(parse_driver* d, yyscan_t* scanner);
void scanner_destroy(yyscan_t* scanner);
struct parse_driver {
std::string file_name;
std::ifstream file_stream;
std::ostringstream string_stream;
yy::location location;
size_t file_offset;
std::vector<size_t> line_offsets;
definition_group global_defs;
std::string read_file;
parse_driver(const std::string& file)
: file_name(file), file_offset(0) {}
void run_parse() {
file_stream.open(file_name);
if(!file_stream.good()) throw 0;
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line_offsets.push_back(0);
yyscan_t scanner;
scanner_init(this, &scanner);
yy::parser parser(scanner, *this);
parser();
scanner_destroy(&scanner);
read_file = string_stream.str();
}
int get() {
int new_char = file_stream.get();
if(new_char == EOF) return EOF;
file_offset++;
if(new_char == '\n') line_offsets.push_back(file_offset);
string_stream.put(new_char);
return new_char;
}
size_t get_index(int line, int column) {
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assert(line > 0);
assert(line <= line_offsets.size());
size_t file_offset = line_offsets[line-1];
file_offset += column - 1;
return file_offset;
}
size_t get_line_end(int line) {
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if(line > line_offsets.size()) return read_file.size();
return get_index(line+1, 1);
}
};
#define YY_DECL yy::parser::symbol_type yylex(yyscan_t yyscanner, parse_driver& drv)
YY_DECL;