120 lines
3 KiB
Text
120 lines
3 KiB
Text
/* Require bison minimal version */
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%require "3.2"
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/* write out a header file containing the token defines */
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%header
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// Code for the header file generated by bison
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%code requires {
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typedef void* yyscan_t;
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struct parser_state {
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unsigned long tmp_val;
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unsigned long* calorie_list;
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unsigned long size;
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};
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}
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// Code for the c file
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%{
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#include <stdio.h>
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#include <stdlib.h>
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#include "parser.h"
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#include "lexer.h"
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void push_value(struct parser_state* state) {
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// TODO(feliix42): error handling here?
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state->calorie_list = realloc(state->calorie_list, (state->size+1) * sizeof(unsigned long));
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state->calorie_list[state->size] = state->tmp_val;
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state->tmp_val = 0;
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state->size++;
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}
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void yyerror(struct parser_state* state, yyscan_t scanner, const char* msg) {
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(void)state;
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(void)scanner;
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fprintf(stderr, "\033[93mSyntax Error: %s\033[0m\n", msg);
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}
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%}
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// define a reentrant parser
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%define api.pure
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// enable parser tracing and detailed error messages (plus Lookahead Correction)
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%define parse.trace
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%define parse.error detailed
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%define parse.lac full
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%lex-param { yyscan_t scanner }
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%parse-param { struct parser_state* state }
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%parse-param { yyscan_t scanner }
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%union {
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unsigned long num;
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}
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%start input
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%token NEWLINE
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%token <num> NUMBER
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%term END_OF_FILE
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%%
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input
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: line input
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| END_OF_FILE { if (state->tmp_val != 0) { push_value(state); } return 0; }
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;
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line
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: NUMBER NEWLINE { state->tmp_val += $1; }
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| NEWLINE { push_value(state); }
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;
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%%
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int main(void) {
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struct parser_state* parser_state = calloc(1, sizeof(struct parser_state));
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if (!parser_state) {
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fprintf(stderr, "[error] failed to allocate parser state\n");
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return EXIT_FAILURE;
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}
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yyscan_t scanner;
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/*YY_BUFFER_STATE state;*/
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if (yylex_init(&scanner)) {
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fprintf(stderr, "\033[91m[error] Could not initialize lexer\n");
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return EXIT_FAILURE;
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}
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if (yyparse(parser_state, scanner)) {
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// TODO: Error handling https://www.gnu.org/software/bison/manual/html_node/Parser-Function.html
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// error during parse occured
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return EXIT_FAILURE;
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}
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yylex_destroy(scanner);
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// task 1
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unsigned long max_vals[3] = {0, 0, 0};
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for (unsigned long i = 0; i < parser_state->size; i++) {
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if (parser_state->calorie_list[i] > max_vals[0]) {
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int y = 0;
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while (y < 3 && parser_state->calorie_list[i] > max_vals[y+1]) {
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y++;
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}
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for (int yx = 0; yx < y; yx++) {
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max_vals[yx] = max_vals[yx+1];
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}
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max_vals[y] = parser_state->calorie_list[i];
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}
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}
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printf("Largest individual calorie loads:\n%lu\n%lu\n%lu\n", max_vals[0], max_vals[1], max_vals[2]);
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printf("-------------\n");
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printf("total: %lu\n", max_vals[0] + max_vals[1] + max_vals[2]);
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return 0;
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}
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