Switch to using FILE* and default YY_INPUT.

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);
+}