spp/spp.c

/* - | Copyright | ------------------------------------------------------------
   Copyright (c) 2026 Randy Jordan

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

 * --------------------------------------------------------------------------*/
#include "spp.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static char*
read_file_into_mem(const char* path)
{
  FILE* file = fopen(path, "rb");
  if (file == NULL) {
    fprintf(stderr, "Could not open file \"%s\".\n", path);
    exit(74);
  }

  fseek(file, 0L, SEEK_END);
  size_t fileSize = ftell(file);
  rewind(file);

  char* buffer = (char*)malloc(fileSize + 1);
  if (buffer == NULL) {
    fprintf(stderr, "Not enough memory to read \"%s\".\n", path);
    exit(74);
  }

  size_t bytesRead = fread(buffer, sizeof(char), fileSize, file);
  if (bytesRead < fileSize) {
    fprintf(stderr, "Could not read file \"%s\".\n", path);
    exit(74);
  }

  buffer[bytesRead] = '\0';
  fclose(file);
  return buffer;
}

static size_t
word_count(const struct SPP_Stream s, const char* path)
{
  size_t words = 0;
  bool in_word = false;

  while (!spp_eof(s)) {
    char c = **s.cursor;

    // Treat common ASCII whitespace as separators
    bool is_ws = (c == ' ' || c == '\t' || c == '\n' || c == '\r' ||
                  c == '\v' || c == '\f');

    if (is_ws) {
      in_word = false;
      (*s.cursor)++;
    } else {
      if (!in_word) {
        words++;
        printf("%s - Word Count: %lld\r", path, words);
        fflush(stdout);
        in_word = true;
      }
      (*s.cursor)++;
    }
  }

  printf("%s - Word Count: %lld\n", path, words);
  fflush(stdout);
  return words;
}

static size_t
line_count(const struct SPP_Stream s, const char* path)
{

  size_t lines = 0;
  while (!spp_eof(s)) {
    if (spp_is(s, "\n")) {
      lines++;
      printf("%s - Line Count: %lld\r", path, lines);
      fflush(stdout);
      (*s.cursor)++;

    } else {
      (*s.cursor)++;
    }
  }
  printf("%s - Line Count: %lld\n", path, lines);
  fflush(stdout);
  return lines;
}

bool
spp_is(const struct SPP_Stream s, const char* list)
{
  assert(list != NULL);
  assert(s.cursor != NULL && *s.cursor != NULL);

  return strchr(list, **s.cursor);
}

bool
spp_eof(const struct SPP_Stream s)
{
  assert(s.cursor != NULL && *s.cursor != NULL);

  return **s.cursor == 0;
}

char
spp_take(const struct SPP_Stream s, const char* list)
{
  if (!spp_is(s, list))
    return 0;

  const char r = **s.cursor;
  (*s.cursor)++;
  return r;
}

size_t
spp_skip(const struct SPP_Stream s, const char* list)
{
  size_t size = 0;
  for (; !spp_eof(s) && spp_is(s, list); size++) {
    (*s.cursor)++;
  }

  return size;
}

size_t
spp_until(const struct SPP_Stream s, const char* list)
{
  size_t size = 0;
  for (; !spp_eof(s) && !spp_is(s, list); size++) {
    (*s.cursor)++;
  }

  return size;
}

const char*
spp_cursor(struct SPP_Stream s)
{
  return *s.cursor;
}

int
main(int argc, char* argv[])
{
  if (argc != 2) {
    fprintf(stderr, "Usage: %s <path>\n", argv[0]);
    return 1;
  }

  const char* path = argv[1];
  const char* buffer = read_file_into_mem(path);

  struct SPP_Stream stream = { .cursor = &buffer };
  word_count(stream, path);

  return EXIT_SUCCESS;
}