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crowsite
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working on new lexers to allow for multiple conditions in statements

main
Brett 2023-08-21 15:21:28 -04:00
parent 477a230974
commit aaf29c5fe7
2 changed files with 218 additions and 59 deletions
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40
include/crowsite/site/cache.h
View File

@ -7,17 +7,31 @@
#include <crowsite/site/web.h>
#include <filesystem>
#include <blt/std/hashmap.h>
namespace cs {
namespace cs
{
class LexerSyntaxError : public std::runtime_error {
using RuntimeContext = HASHMAP<std::string, std::string>;
class LexerSyntaxError : public std::runtime_error
{
public:
LexerSyntaxError(): std::runtime_error("Invalid template syntax. EOF occurred before template was fully processed!"){}
LexerSyntaxError(): std::runtime_error("Invalid template syntax. EOF occurred before template was fully processed!")
{}
};
class LexerSearchFailure : public std::runtime_error
{
public:
explicit LexerSearchFailure(const std::string& str): std::runtime_error("The lexer failed to find ending for tag " + str)
{}
};
constexpr uint64_t toMB = 1024 * 1024;
struct CacheSettings {
struct CacheSettings
{
// amount to hard prune at when reached, note: the engine will reduce all the way down to soft max memory
uint64_t hardMaxMemory = 2048 * toMB;
// it's more likely this will never be exceeded but the engine will make no attempt to prune more than softPruneAmount
@ -26,9 +40,11 @@ namespace cs {
uint64_t softPruneAmount = 2 * toMB;
};
class CacheEngine {
class CacheEngine
{
private:
struct CacheValue {
struct CacheValue
{
int64_t cacheTime;
std::filesystem::file_time_type lastModified;
std::unique_ptr<HTMLPage> page;
@ -40,21 +56,29 @@ namespace cs {
HASHMAP<std::string, CacheValue> m_Pages;
static uint64_t calculateMemoryUsage(const std::string& path, const CacheValue& value);
/**
* @return memory usage of the pages cache in bytes
*/
uint64_t calculateMemoryUsage();
void resolveLinks(const std::string& file, HTMLPage& page);
void loadPage(const std::string& path);
/**
* Prunes the cache starting with the oldest pages we have loaded. (in bytes)
*/
void prune(uint64_t amount);
public:
explicit CacheEngine(StaticContext& context, const CacheSettings& settings = {});
const std::string& fetch(const std::string& path);
std::string fetch(const std::string& path, const RuntimeContext& context);
};
}
#endif //CROWSITE_CACHE_H

237
src/crowsite/site/cache.cpp
View File

@ -4,34 +4,46 @@
#include <crowsite/site/cache.h>
#include <vector>
#include "blt/std/logging.h"
#include "blt/std/string.h"
#include "crowsite/utility.h"
#include <algorithm>
#include <blt/std/time.h>
#include <blt/parse/mustache.h>
#include <optional>
namespace cs
{
struct StringLexer
class LexerBase
{
private:
protected:
std::string str;
size_t index = 0;
public:
explicit StringLexer(std::string str): str(std::move(str))
explicit LexerBase(std::string str): str(std::move(str))
{}
inline bool hasNext()
{
if (index >= str.size())
return false;
return true;
return index < str.size();
}
inline bool hasTemplatePrefix(char c)
inline char peekPrefix()
{
if (index + 2 >= str.size())
return false;
return str[index] == '{' && str[index + 1] == '{' && str[index + 2] == c;
return str[index + 2];
}
inline char consume()
{
return str[index++];
}
inline void consumeTemplatePrefix()
{
index += 3;
}
inline void consumeTemplateSuffix()
{
index += 2;
}
inline bool hasTemplateSuffix()
@ -41,28 +53,19 @@ namespace cs
return str[index] == '}' && str[index + 1] == '}';
}
inline void consumeTemplatePrefix()
{
// because any custom mustache syntax will have to have a prefix like '$' or '@'
// it is fine that we make the assumption of 3 characters consumed.
index += 3;
}
inline void consumeTemplateSuffix()
{
index += 2;
}
/**
* This function assumes hasTemplatePrefix(char) has returned true and will consume both the prefix and suffix
* This function assumes hasTemplatePrefix(char) has returned true and will consume the prefix / suffix
* @return the token found between the prefix and suffix
* @throws LexerSyntaxError if the parser is unable to process a full token
*/
inline std::string consumeToken(){
inline std::string consumeToken()
{
consumeTemplatePrefix();
std::string token;
while (!hasTemplateSuffix()) {
if (!hasNext()) {
while (!hasTemplateSuffix())
{
if (!hasNext())
{
throw LexerSyntaxError();
}
token += consume();
@ -70,11 +73,129 @@ namespace cs
consumeTemplateSuffix();
return token;
}
};
class CacheLexer : public LexerBase
{
public:
explicit CacheLexer(std::string str): LexerBase(std::move(str))
{}
inline char consume()
static inline bool isCharNext(char c)
{
return str[index++];
switch (c)
{
case '$':
case '@':
return true;
default:
return false;
}
}
inline bool hasTemplatePrefix()
{
if (index + 2 >= str.size())
return false;
return str[index] == '{' && str[index + 1] == '{' && isCharNext(str[index + 2]);
}
};
class RuntimeLexer : public LexerBase
{
private:
class LogicalEval
{
private:
enum class TokenType
{
AND, // &&
OR, // ||
NOT, // !
OPEN, // (
CLOSE // )
};
struct Token {
TokenType type;
std::optional<std::string> value;
};
std::vector<Token> tokens;
size_t m_index = 0;
public:
void processString(const std::string& str)
{
size_t index = 0;
while (index < str.size())
{
char c = str[index++];
if (c == '&' || c == '|'){
} else if (c == '!') {
} else if (c == '(') {
tokens.emplace_back(TokenType::OPEN);
} else if (c == ')') {
tokens.emplace_back(TokenType::CLOSE);
}
}
}
};
public:
explicit RuntimeLexer(std::string str): LexerBase(std::move(str))
{}
inline bool hasTemplatePrefix(char c = '%')
{
if (index + 2 >= str.size())
return false;
return str[index] == '{' && str[index + 1] == '{' && str[index + 2] == c;
}
static std::string consumeToEndTemplate(const std::string& tokenName)
{
}
static size_t findLastTagLocation(const std::string& tag, const std::string& data)
{
std::vector<size_t> tagLocations{};
RuntimeLexer lexer(data);
while (lexer.hasNext())
{
if (lexer.hasTemplatePrefix('/'))
{
auto loc = lexer.index;
auto token = lexer.consumeToken();
if (tag == token)
tagLocations.push_back(loc);
} else
lexer.consume();
}
if (tagLocations.empty())
throw LexerSearchFailure(tag);
return tagLocations[tagLocations.size() - 1];
}
static std::string searchAndReplace(const std::string& data, const RuntimeContext& context)
{
RuntimeLexer lexer(data);
std::string results;
while (lexer.hasNext())
{
if (lexer.hasTemplatePrefix())
{
auto token = lexer.consumeToken();
auto searchField = lexer.str.substr(lexer.index);
auto endTokenLoc = RuntimeLexer::findLastTagLocation(token, searchField);
auto
} else
results += lexer.consume();
}
return results;
}
};
@ -206,7 +327,7 @@ namespace cs
void CacheEngine::resolveLinks(const std::string& file, HTMLPage& page)
{
StringLexer lexer(page.getRawSite());
CacheLexer lexer(page.getRawSite());
std::string resolvedSite;
const std::string valid_file_endings[3] = {
@ -217,13 +338,14 @@ namespace cs
while (lexer.hasNext())
{
if (lexer.hasTemplatePrefix('@'))
if (lexer.hasTemplatePrefix())
{
auto prefix = lexer.peekPrefix();
auto token = lexer.consumeToken();
for (const auto& suffix : valid_file_endings)
switch (prefix)
{
if (token.ends_with(suffix))
{
case '@':
if (token == file)
{
BLT_WARN("Recursive load detected!");
@ -231,24 +353,31 @@ namespace cs
BLT_WARN("Detected in file '%s' offending link '%s'", file.c_str(), token.c_str());
break;
}
resolvedSite += fetch(token);
break;
}
}
} else if (lexer.hasTemplatePrefix('$'))
{
auto token = lexer.consumeToken();
if (std::find_if(
m_Context.begin(), m_Context.end(),
[&token](auto in) -> bool {
return token == in.first;
for (const auto& suffix : valid_file_endings)
{
if (token.ends_with(suffix))
{
resolvedSite += fetch(token);
break;
}
}
) == m_Context.end())
{
// unable to find the token, we should throw an error to tell the user! (or admin in this case)
BLT_WARN("Unable to find token '%s'!", token.c_str());
} else
resolvedSite += m_Context[token];
break;
case '$':
if (std::find_if(
m_Context.begin(), m_Context.end(),
[&token](auto in) -> bool {
return token == in.first;
}
) == m_Context.end())
{
// unable to find the token, we should throw an error to tell the user! (or admin in this case)
BLT_WARN("Unable to find token '%s'!", token.c_str());
} else
resolvedSite += m_Context[token];
break;
default:
break;
}
} else
resolvedSite += lexer.consume();
}
@ -256,5 +385,11 @@ namespace cs
page.getRawSite() = resolvedSite;
}
std::string CacheEngine::fetch(const std::string& path, const RuntimeContext& context)
{
auto fetched = fetch(path);
return RuntimeLexer::searchAndReplace(fetched, context);
}
}