//
// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// string_res -- variable-length, mutable run of text, with resource semantics
//
// Author           : Michael L. Brooks
// Created On       : Fri Sep 03 11:00:00 2021
// Last Modified By : Michael L. Brooks
// Last Modified On : Fri Sep 03 11:00:00 2021
// Update Count     : 1
//

#pragma once

#include <fstream.hfa>
#include <string.h>    // e.g. strlen

    
//######################### HandleNode #########################
//private

struct VbyteHeap;

struct HandleNode {
    HandleNode *flink;					// forward link
    HandleNode *blink;					// backward link
    VbyteHeap *ulink;                   // upward link

    char *s;						// pointer to byte string
    unsigned int lnth;					// length of byte string
}; // HandleNode

VbyteHeap * DEBUG_string_heap();
size_t DEBUG_string_bytes_in_heap( VbyteHeap * heap );
size_t DEBUG_string_bytes_avail_until_gc( VbyteHeap * heap );
const char * DEBUG_string_heap_start( VbyteHeap * heap );

void TUNING_set_string_heap_liveness_threshold( double val );

//######################### String #########################

// A dynamically-sized string
struct string_res {
    HandleNode Handle; // chars, start, end, global neighbours
    bool shareEditSet_owns_ulink;
    string_res * shareEditSet_prev;
    string_res * shareEditSet_next;
};


//######################### charclass_res #########################

struct charclass_res {
    string_res chars;
};

void ?{}( charclass_res & ) = void;
void ?{}( charclass_res &, charclass_res) = void;
charclass_res ?=?( charclass_res &, charclass_res) = void;
void ?{}( charclass_res &, const string_res & chars);
void ?{}( charclass_res &, const char * chars );
void ?{}( charclass_res &, const char * chars, size_t charssize );
void ^?{}( charclass_res & );


//######################### String #########################

// Getters
size_t size(const string_res &s);

// Constructors, Assignment Operators, Destructor
void ?{}(string_res &s); // empty string
void ?{}(string_res &s, const char* buffer, size_t bsize); // copy specific length from buffer
static inline void ?{}(string_res &s, const char* rhs) { // copy from string literal (NULL-terminated)
    (s){ rhs, strlen(rhs) };
}

void ?{}(string_res &s, const string_res & s2) = void;
void ?{}(string_res &s, string_res & s2) = void;

enum StrResInitMode { COPY_VALUE, SHARE_EDITS };
void ?{}(string_res &s, const string_res & src, StrResInitMode, size_t start, size_t end );
static inline void ?{}(string_res &s, const string_res & src, StrResInitMode mode ) {
    ?{}( s, src, mode, 0, size(src));
}

string_res & assign(string_res &s, const char* buffer, size_t bsize); // copy specific length from buffer
static inline string_res & ?=?(string_res &s, const char* other) {  // copy from string literal (NULL-terminated)
    return assign(s, other, strlen(other));
}
string_res & ?=?(string_res &s, const string_res &other);
string_res & ?=?(string_res &s, string_res &other);
string_res & ?=?(string_res &s, char other);

void ^?{}(string_res &s);

// IO Operator
ofstream & ?|?(ofstream &out, const string_res &s);
void ?|?(ofstream &out, const string_res &s);

// Concatenation
void append(string_res &s, const char* buffer, size_t bsize);
void ?+=?(string_res &s, char other); // append a character
void ?+=?(string_res &s, const string_res &s2); // append-concatenate to first string
static inline void ?+=?(string_res &s, const char* other) {
    append( s, other, strlen(other) );
}

// Character access
void assignAt(const string_res &s, size_t index, char val);
char ?[?](const string_res &s, size_t index); // Mike changed to ret by val from Sunjay's ref, to match Peter's
//char codePointAt(const string_res &s, size_t index); // revisit under Unicode

// Comparisons
bool ?==?(const string_res &s, const string_res &other);
bool ?!=?(const string_res &s, const string_res &other);
bool ?==?(const string_res &s, const char* other);
bool ?!=?(const string_res &s, const char* other);

// String search
bool contains(const string_res &s, char ch); // single character

int find(const string_res &s, char search);
int find(const string_res &s, const string_res &search);
int find(const string_res &s, const char* search);
int find(const string_res &s, const char* search, size_t searchsize);

int findFrom(const string_res &s, size_t fromPos, char search);
int findFrom(const string_res &s, size_t fromPos, const string_res &search);
int findFrom(const string_res &s, size_t fromPos, const char* search);
int findFrom(const string_res &s, size_t fromPos, const char* search, size_t searchsize);

bool includes(const string_res &s, const string_res &search);
bool includes(const string_res &s, const char* search);
bool includes(const string_res &s, const char* search, size_t searchsize);

bool startsWith(const string_res &s, const string_res &prefix);
bool startsWith(const string_res &s, const char* prefix);
bool startsWith(const string_res &s, const char* prefix, size_t prefixsize);

bool endsWith(const string_res &s, const string_res &suffix);
bool endsWith(const string_res &s, const char* suffix);
bool endsWith(const string_res &s, const char* suffix, size_t suffixsize);

int include(const string_res &s, const charclass_res &mask);
int exclude(const string_res &s, const charclass_res &mask);

// Modifiers
void padStart(string_res &s, size_t n);
void padStart(string_res &s, size_t n, char padding);
void padEnd(string_res &s, size_t n);
void padEnd(string_res &s, size_t n, char padding);