Switch to using FILE* and default YY_INPUT.

13/CMakeLists.txt

@@ -37,6 +37,7 @@ add_executable(compiler
     instruction.cpp instruction.hpp
     graph.cpp graph.hpp
     global_scope.cpp global_scope.hpp
+    parse_driver.cpp parse_driver.hpp
     ${BISON_parser_OUTPUTS}
     ${FLEX_scanner_OUTPUTS}
     main.cpp

13/parse_driver.cpp

@@ -0,0 +1,55 @@
+#include "parse_driver.hpp"
+#include "scanner.hpp"
+#include <sstream>
+
+bool parse_driver::run_parse() {
+    FILE* stream = fopen(file_name.c_str(), "r");
+    if(!stream) return false;
+    string_stream = std::ostringstream();
+    file_offset = 0;
+    line_offsets.push_back(0);
+    yyscan_t scanner;
+    yylex_init(&scanner);
+    yyset_in(stream, scanner);
+    yy::parser parser(scanner, *this);
+    parser();
+    yylex_destroy(scanner);
+    fclose(stream);
+    file_contents = string_stream.str();
+    return true;
+}
+
+void parse_driver::write(const char* buf, size_t len) {
+    string_stream.write(buf, len);
+    file_offset += len;
+}
+
+void parse_driver::mark_line() {
+    line_offsets.push_back(file_offset);
+}
+
+size_t parse_driver::get_index(int line, int column) {
+    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 parse_driver::get_line_end(int line) {
+    if(line > line_offsets.size()) return file_contents.size();
+    return get_index(line+1, 1);
+}
+
+void parse_driver::print_highlighted_location(std::ostream& stream, const yy::location& loc) {
+    size_t print_start = get_index(loc.begin.line, 1);
+    size_t highlight_start = get_index(loc.begin.line, loc.begin.column);
+    size_t highlight_end = get_index(loc.end.line, loc.end.column);
+    size_t print_end = get_line_end(loc.end.line);
+    const char* content = file_contents.c_str();
+    stream.write(content + print_start, highlight_start - print_start);
+    stream << "\033[4;31m";
+    stream.write(content + highlight_start, highlight_end - highlight_start);
+    stream << "\033[0m";
+    stream.write(content + highlight_end, print_end - highlight_end);
+}

13/parse_driver.hpp

@@ -13,7 +13,6 @@ void scanner_destroy(yyscan_t* scanner);
 
 struct parse_driver {
     std::string file_name;
-    std::ifstream file_stream;
     std::ostringstream string_stream;
 
     yy::location location;
@@ -21,58 +20,17 @@ struct parse_driver {
 
     std::vector<size_t> line_offsets;
     definition_group global_defs;
-    std::string read_file;
+    std::string file_contents;
 
     parse_driver(const std::string& file)
         : file_name(file), file_offset(0) {}
 
-    bool run_parse() {
-        file_stream.open(file_name);
-        if(!file_stream.good()) return false;
-        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();
-        return true;
-    }
-
-    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) {
-        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) {
-        if(line > line_offsets.size()) return read_file.size();
-        return get_index(line+1, 1);
-    }
-
-    void print_highlighted_location(std::ostream& stream, const yy::location& loc) {
-        size_t print_start = get_index(loc.begin.line, 1);
-        size_t highlight_start = get_index(loc.begin.line, loc.begin.column);
-        size_t highlight_end = get_index(loc.end.line, loc.end.column);
-        size_t print_end = get_line_end(loc.end.line);
-        const char* content = read_file.c_str();
-        stream.write(content + print_start, highlight_start - print_start);
-        stream << "\033[4;31m";
-        stream.write(content + highlight_start, highlight_end - highlight_start);
-        stream << "\033[0m";
-        stream.write(content + highlight_end, print_end - highlight_end);
-    }
+    bool run_parse();
+    void write(const char* buff, size_t len);
+    void mark_line();
+    size_t get_index(int line, int column);
+    size_t get_line_end(int line);
+    void print_highlighted_location(std::ostream& stream, const yy::location& loc);
 };
 
 #define YY_DECL yy::parser::symbol_type yylex(yyscan_t yyscanner, parse_driver& drv)

13/scanner.l

@@ -1,5 +1,6 @@
 %option noyywrap
 %option reentrant
+%option header-file="scanner.hpp"
 
 %{
 #include <iostream>
@@ -8,18 +9,12 @@
 #include "parse_driver.hpp"
 #include "parser.hpp"
 
-#define YY_EXTRA_TYPE parse_driver*
-#define YY_USER_ACTION drv.location.step(); drv.location.columns(yyleng); 
-#define YY_INPUT(buf,result,max_size) \
-    { \
-    int c = yyextra->get(); \
-    result = (c == EOF) ? YY_NULL : (buf[0] = c, 1); \
-    }
+#define YY_USER_ACTION drv.write(yytext, yyleng); drv.location.step(); drv.location.columns(yyleng); 
 %}
 
 %%
 
-\n { drv.location.lines(); }
+\n { drv.location.lines(); drv.mark_line(); }
 [ ]+ {}
 \\ { return yy::parser::make_BACKSLASH(drv.location); }
 \+ { return yy::parser::make_PLUS(drv.location); }
@@ -49,10 +44,3 @@ in { return yy::parser::make_IN(drv.location); }
 <<EOF>> { return yy::parser::make_YYEOF(drv.location); }
 
 %%
-
-void scanner_init(parse_driver* d, yyscan_t* scanner) {
-    yylex_init_extra(d, scanner);
-}
-void scanner_destroy(yyscan_t* scanner) {
-    yylex_destroy(*scanner);
-}