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// MyXml.cpp
#include "StdAfx.h"
#include "MyXml.h"
static bool IsValidChar(char c)
{
return
c >= 'a' && c <= 'z' ||
c >= 'A' && c <= 'Z' ||
c >= '0' && c <= '9' ||
c == '-';
}
static bool IsSpaceChar(char c)
{
return (c == ' ' || c == '\t' || c == 0x0D || c == 0x0A);
}
#define SKIP_SPACES(s, pos) while (IsSpaceChar(s[pos])) pos++;
static bool ReadProperty(const AString &s, int &pos, CXmlProp &prop)
{
prop.Name.Empty();
prop.Value.Empty();
for (; pos < s.Length(); pos++)
{
char c = s[pos];
if (!IsValidChar(c))
break;
prop.Name += c;
}
if (prop.Name.IsEmpty())
return false;
SKIP_SPACES(s, pos);
if (s[pos++] != '=')
return false;
SKIP_SPACES(s, pos);
if (s[pos++] != '\"')
return false;
while (pos < s.Length())
{
char c = s[pos++];
if (c == '\"')
return true;
prop.Value += c;
}
return false;
}
int CXmlItem::FindProperty(const AString &propName) const
{
for (int i = 0; i < Props.Size(); i++)
if (Props[i].Name == propName)
return i;
return -1;
}
AString CXmlItem::GetPropertyValue(const AString &propName) const
{
int index = FindProperty(propName);
if (index >= 0)
return Props[index].Value;
return AString();
}
bool CXmlItem::IsTagged(const AString &tag) const
{
return (IsTag && Name == tag);
}
int CXmlItem::FindSubTag(const AString &tag) const
{
for (int i = 0; i < SubItems.Size(); i++)
if (SubItems[i].IsTagged(tag))
return i;
return -1;
}
AString CXmlItem::GetSubString() const
{
if (SubItems.Size() == 1)
{
const CXmlItem &item = SubItems[0];
if (!item.IsTag)
return item.Name;
}
return AString();
}
AString CXmlItem::GetSubStringForTag(const AString &tag) const
{
int index = FindSubTag(tag);
if (index >= 0)
return SubItems[index].GetSubString();
return AString();
}
bool CXmlItem::ParseItems(const AString &s, int &pos, int numAllowedLevels)
{
if (numAllowedLevels == 0)
return false;
SubItems.Clear();
AString finishString = "</";
for (;;)
{
SKIP_SPACES(s, pos);
if (s.Mid(pos, finishString.Length()) == finishString)
return true;
CXmlItem item;
if (!item.ParseItem(s, pos, numAllowedLevels - 1))
return false;
SubItems.Add(item);
}
}
bool CXmlItem::ParseItem(const AString &s, int &pos, int numAllowedLevels)
{
SKIP_SPACES(s, pos);
int pos2 = s.Find('<', pos);
if (pos2 < 0)
return false;
if (pos2 != pos)
{
IsTag = false;
Name += s.Mid(pos, pos2 - pos);
pos = pos2;
return true;
}
IsTag = true;
pos++;
SKIP_SPACES(s, pos);
for (; pos < s.Length(); pos++)
{
char c = s[pos];
if (!IsValidChar(c))
break;
Name += c;
}
if (Name.IsEmpty() || pos == s.Length())
return false;
int posTemp = pos;
for (;;)
{
SKIP_SPACES(s, pos);
if (s[pos] == '/')
{
pos++;
// SKIP_SPACES(s, pos);
return (s[pos++] == '>');
}
if (s[pos] == '>')
{
if (!ParseItems(s, ++pos, numAllowedLevels))
return false;
AString finishString = AString("</") + Name + AString(">");
if (s.Mid(pos, finishString.Length()) != finishString)
return false;
pos += finishString.Length();
return true;
}
if (posTemp == pos)
return false;
CXmlProp prop;
if (!ReadProperty(s, pos, prop))
return false;
Props.Add(prop);
posTemp = pos;
}
}
static bool SkipHeader(const AString &s, int &pos, const AString &startString, const AString &endString)
{
SKIP_SPACES(s, pos);
if (s.Mid(pos, startString.Length()) == startString)
{
pos = s.Find(endString, pos);
if (pos < 0)
return false;
pos += endString.Length();
SKIP_SPACES(s, pos);
}
return true;
}
bool CXml::Parse(const AString &s)
{
int pos = 0;
if (!SkipHeader(s, pos, "<?xml", "?>"))
return false;
if (!SkipHeader(s, pos, "<!DOCTYPE", ">"))
return false;
if (!Root.ParseItem(s, pos, 1000))
return false;
SKIP_SPACES(s, pos);
return (pos == s.Length() && Root.IsTag);
}
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