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#include "../includes/compiler.h"
#include <stdio.h>
#include <string.h>
int find_string(string src, string query, size_t sz_src, size_t sz_query)
{
int j = 0;
while ((j < (sz_src - sz_query)) && (strncmp(query, src + j, sz_query))) ++j;
return j;
}
bool is_token(char c)
{
bool token_check = false;
for (int i = 0; i < N_TOKENS; ++i)
if (c == TOKENS[i])
{
token_check = true;
break;
}
return token_check;
}
void compile_inner_text(string dest, string src, size_t sz_src,
string line_or_source)
{
/* cursor is the current index on the dest pointer
* lower represents the last tag character before content
* upper represents the first tag character after content
*
* size_of_content is self explanatory (size of content delimited by tags)
* tag_size is the compiled size of a tag
* md_tag_size is the precompiled size of a tag
*
* tag is the string for the open HTML tag
* close_tag is the string for the close HTML tag
*
* i and j are iterator variables
*/
int cursor, lower, upper;
size_t size_of_content, tag_size, md_tag_size;
string md_tag, tag, close_tag;
int i, j;
lower = 0;
upper = 0;
cursor = 0;
for (i = 0; i < sz_src; ++i)
{
if (is_token(src[i]))
{
// Information for each tag
// NOTE: Here's where you add new text tags
switch (src[i])
{
case '*': {
// Twin asterisks
if (src[i + 1] == '*')
{
md_tag = "**";
tag = "<strong>";
close_tag = "</strong>";
tag_size = 8;
md_tag_size = 2;
}
// one asterisk
else
{
md_tag = "*";
tag = "<i>";
close_tag = "</i>";
tag_size = 3;
md_tag_size = 1;
}
break;
}
case '_': {
tag = "<u>";
close_tag = "</u>";
md_tag = "_";
tag_size = 3;
md_tag_size = 1;
break;
}
case '~': {
tag = "<s>";
close_tag = "</s>";
md_tag = "~";
tag_size = 3;
md_tag_size = 1;
break;
}
default:
break;
}
if (src[i + md_tag_size] == '\0')
{
strncpy(dest, src + i, md_tag_size);
break;
}
// find the corresponding markdown tag, and report errors
j = find_string(src + i + md_tag_size, md_tag, sz_src - i - md_tag_size,
md_tag_size);
j += i + md_tag_size;
// error checking the token
if (src[j] == md_tag[0])
{
lower = i + md_tag_size - 1;
upper = j;
}
else
{
// error, no matching asterisk
fprintf(stderr, "No corresponding %s for %s:%d\n", md_tag,
line_or_source, i + md_tag_size);
exit(0);
}
size_of_content = upper - lower - 1;
strncpy(dest + cursor, tag, tag_size);
strncpy(dest + cursor + tag_size, src + lower + 1, size_of_content);
strncpy(dest + cursor + tag_size + size_of_content, close_tag,
tag_size + 1);
cursor +=
tag_size + size_of_content + tag_size + 1; // shift after operation
i += size_of_content + (2 * md_tag_size) - 1;
}
else
{
strncpy(dest + cursor, &src[i], 1);
cursor += 1;
}
}
}
string compile_line(string line, size_t size_of_line, string line_or_source)
{
string compiled_line;
size_t size_of_content;
if (line[0] == '#' || line[0] == '-') // Compile a header or list item
{
const int tag_size = 4;
int start_of_content;
string tag, close_tag;
if (line[0] == '#')
{
// Get the level of header (h1, h2, etc)
int depth;
for (depth = 1; line[depth] == '#'; ++depth) continue;
start_of_content = depth;
size_of_content = size_of_line - depth; // remove hashes
// Generate the header tags based on depth
tag = malloc(sizeof(*tag) * 5);
close_tag = malloc(sizeof(*close_tag) * 6);
sprintf(tag, "<h%d>", depth);
sprintf(close_tag, "</h%d>", depth);
}
else
{
tag = "<li>";
close_tag = "</li>";
size_of_content = size_of_line - 1;
start_of_content = 1;
}
// allocate buffer with space for content and opposing tags
compiled_line =
malloc(sizeof(*compiled_line) * (size_of_content + (2 * tag_size) + 2));
// write start tag to compiled_line
strncpy(compiled_line, tag, tag_size);
// write the rest of the line to the compiled_line
strncpy(compiled_line + tag_size, line + start_of_content, size_of_line);
// write the end tags
strncpy(compiled_line + size_of_content + tag_size, close_tag,
tag_size + 1);
// write the terminator
compiled_line[size_of_content + (2 * tag_size) + 1] = '\0';
}
else // Compile a standard piece of text
{
compiled_line = malloc(sizeof(*compiled_line) * size_of_line * 2);
compile_inner_text(compiled_line, line, size_of_line, line_or_source);
}
return compiled_line;
}
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