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/+
This module is part of d2sqlite3.
Authors:
Nicolas Sicard (biozic) and other contributors at $(LINK https://github.com/biozic/d2sqlite3)
Copyright:
Copyright 2011-18 Nicolas Sicard.
License:
$(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0).
+/
module d2sqlite3.internal.util;
import std.traits : isBoolean, isIntegral, isFloatingPoint, isSomeString,
isArray, isStaticArray, isDynamicArray;
import std.typecons : Nullable;
import d2sqlite3.sqlite3;
import d2sqlite3.internal.memory;
package(d2sqlite3):
string errmsg(sqlite3* db) nothrow
{
import std.conv : to;
return sqlite3_errmsg(db).to!string;
}
string errmsg(sqlite3_stmt* stmt) nothrow
{
return errmsg(sqlite3_db_handle(stmt));
}
auto byStatement(string sql)
{
static struct ByStatement
{
string sql;
size_t end;
this(string sql)
{
this.sql = sql;
end = findEnd();
}
bool empty() const @safe pure nothrow @nogc
{
return !sql.length;
}
string front() const @safe pure nothrow @nogc
{
return sql[0 .. end];
}
void popFront()
{
sql = sql[end .. $];
end = findEnd();
}
private:
size_t findEnd()
{
import std.algorithm : countUntil;
import std.string : toStringz;
import std.utf : byCodeUnit;
size_t pos;
bool complete;
do
{
auto tail = sql[pos .. $];
immutable offset = tail.byCodeUnit.countUntil(';') + 1;
pos += offset;
if (offset == 0)
pos = sql.length;
auto part = sql[0 .. pos];
complete = cast(bool) sqlite3_complete(part.toStringz);
}
while (!complete && pos < sql.length);
return pos;
}
}
return ByStatement(sql);
}
unittest
{
import std.algorithm : equal, map;
import std.string : strip;
auto sql = "CREATE TABLE test (dummy);
CREATE TRIGGER trig INSERT ON test BEGIN SELECT 1; SELECT 'a;b'; END;
SELECT 'c;d';;
CREATE";
assert(equal(sql.byStatement.map!(s => s.strip), [
"CREATE TABLE test (dummy);",
"CREATE TRIGGER trig INSERT ON test BEGIN SELECT 1; SELECT 'a;b'; END;",
"SELECT 'c;d';",
";",
"CREATE"
]));
}
// getValue and setResult function templates
// used by createFunction and createAggregate
auto getValue(T)(sqlite3_value* argv)
if (isBoolean!T)
{
return sqlite3_value_int64(argv) != 0;
}
auto getValue(T)(sqlite3_value* argv)
if (isIntegral!T)
{
import std.conv : to;
return sqlite3_value_int64(argv).to!T;
}
auto getValue(T)(sqlite3_value* argv)
if (isFloatingPoint!T)
{
import std.conv : to;
if (sqlite3_value_type(argv) == SQLITE_NULL)
return double.nan;
return sqlite3_value_double(argv).to!T;
}
auto getValue(T)(sqlite3_value* argv)
if (isSomeString!T)
{
import std.conv : to;
return (cast(const(char)*) sqlite3_value_text(argv)).to!T;
}
auto getValue(T)(sqlite3_value* argv)
if (isArray!T && !isSomeString!T)
{
import std.conv : to;
import core.stdc.string : memcpy;
auto n = sqlite3_value_bytes(argv);
ubyte[] blob;
blob.length = n;
memcpy(blob.ptr, sqlite3_value_blob(argv), n);
return cast(T) blob;
}
auto getValue(T : Nullable!U, U...)(sqlite3_value* argv)
{
if (sqlite3_value_type(argv) == SQLITE_NULL)
return T.init;
return T(getValue!(U[0])(argv));
}
void setResult(T)(sqlite3_context* context, T value)
if (isIntegral!T || isBoolean!T)
{
import std.conv : to;
sqlite3_result_int64(context, value.to!long);
}
void setResult(T)(sqlite3_context* context, T value)
if (isFloatingPoint!T)
{
import std.conv : to;
sqlite3_result_double(context, value.to!double);
}
void setResult(T)(sqlite3_context* context, T value)
if (isSomeString!T)
{
import std.conv : to;
auto val = value.to!string;
sqlite3_result_text64(context, cast(const(char)*) anchorMem(cast(void*) val.ptr),
val.length, &releaseMem, SQLITE_UTF8);
}
void setResult(T)(sqlite3_context* context, T value)
if (isDynamicArray!T && !isSomeString!T)
{
auto val = cast(void[]) value;
sqlite3_result_blob64(context, anchorMem(val.ptr), val.length, &releaseMem);
}
void setResult(T)(sqlite3_context* context, T value)
if (isStaticArray!T)
{
auto val = cast(void[]) value;
sqlite3_result_blob64(context, val.ptr, val.sizeof, SQLITE_TRANSIENT);
}
void setResult(T : Nullable!U, U...)(sqlite3_context* context, T value)
{
if (value.isNull)
sqlite3_result_null(context);
else
setResult(context, value.get);
}
string nothrowFormat(Args...)(string fmt, Args args) nothrow
{
import std.string : format;
try
return fmt.format(args);
catch (Exception e)
throw new Error("Error: " ~ e.msg);
}
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