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栈的的语法匹配实现
1.#include <stdio.h>
#include <malloc.h>
#include "LinkList.h"
typedef struct _tag_LinkList
{
LinkListNode header;
int length;
} TLinkList;
LinkList* LinkList_Create() // O(1)
{
TLinkList* ret = (TLinkList*)malloc(sizeof(TLinkList));
if( ret != NULL )
{
ret->length = 0;
ret->header.next = NULL;
}
return ret;
}
void LinkList_Destroy(LinkList* list) // O(1)
{
free(list);
}
void LinkList_Clear(LinkList* list) // O(1)
{
TLinkList* sList = (TLinkList*)list;
if( sList != NULL )
{
sList->length = 0;
sList->header.next = NULL;
}
}
int LinkList_Length(LinkList* list) // O(1)
{
TLinkList* sList = (TLinkList*)list;
int ret = -1;
if( sList != NULL )
{
ret = sList->length;
}
return ret;
}
int LinkList_Insert(LinkList* list, LinkListNode* node, int pos) // O(n)
{
TLinkList* sList = (TLinkList*)list;
int ret = (sList != NULL) && (pos >= 0) && (node != NULL);
int i = 0;
if( ret )
{
LinkListNode* current = (LinkListNode*)sList;
for(i=0; (i<pos) && (current->next != NULL); i++)
{
current = current->next;
}
node->next = current->next;
current->next = node;
sList->length++;
}
return ret;
}
LinkListNode* LinkList_Get(LinkList* list, int pos) // O(n)
{
TLinkList* sList = (TLinkList*)list;
LinkListNode* ret = NULL;
int i = 0;
if( (sList != NULL) && (0 <= pos) && (pos < sList->length) )
{
LinkListNode* current = (LinkListNode*)sList;
for(i=0; i<pos; i++)
{
current = current->next;
}
ret = current->next;
}
return ret;
}
LinkListNode* LinkList_Delete(LinkList* list, int pos) // O(n)
{
TLinkList* sList = (TLinkList*)list;
LinkListNode* ret = NULL;
int i = 0;
if( (sList != NULL) && (0 <= pos) && (pos < sList->length) )
{
LinkListNode* current = (LinkListNode*)sList;
for(i=0; i<pos; i++)
{
current = current->next;
}
ret = current->next;
current->next = ret->next;
sList->length--;
}
return ret;
}
2.#ifndef _LINKLIST_H_
#define _LINKLIST_H_
typedef void LinkList;
typedef struct _tag_LinkListNode LinkListNode;
struct _tag_LinkListNode
{
LinkListNode* next;
};
LinkList* LinkList_Create();
void LinkList_Destroy(LinkList* list);
void LinkList_Clear(LinkList* list);
int LinkList_Length(LinkList* list);
int LinkList_Insert(LinkList* list, LinkListNode* node, int pos);
LinkListNode* LinkList_Get(LinkList* list, int pos);
LinkListNode* LinkList_Delete(LinkList* list, int pos);
#endif
3.#include <malloc.h>
#include "LinkStack.h"
#include "LinkList.h"
typedef struct _tag_LinkStackNode
{
LinkListNode header;
void* item;
} TLinkStackNode;
LinkStack* LinkStack_Create()
{
return LinkList_Create();
}
void LinkStack_Destroy(LinkStack* stack)
{
LinkStack_Clear(stack);
LinkList_Destroy(stack);
}
void LinkStack_Clear(LinkStack* stack)
{
while( LinkStack_Size(stack) > 0 )
{
LinkStack_Pop(stack);
}
}
int LinkStack_Push(LinkStack* stack, void* item)
{
TLinkStackNode* node = (TLinkStackNode*)malloc(sizeof(TLinkStackNode));
int ret = (node != NULL) && (item != NULL);
if( ret )
{
node->item = item;
ret = LinkList_Insert(stack, (LinkListNode*)node, 0);
}
if( !ret )
{
free(node);
}
return ret;
}
void* LinkStack_Pop(LinkStack* stack)
{
TLinkStackNode* node = (TLinkStackNode*)LinkList_Delete(stack, 0);
void* ret = NULL;
if( node != NULL )
{
ret = node->item;
free(node);
}
return ret;
}
void* LinkStack_Top(LinkStack* stack)
{
TLinkStackNode* node = (TLinkStackNode*)LinkList_Get(stack, 0);
void* ret = NULL;
if( node != NULL )
{
ret = node->item;
}
return ret;
}
int LinkStack_Size(LinkStack* stack)
{
return LinkList_Length(stack);
}
4.#ifndef _LINKSTACK_H_
#define _LINKSTACK_H_
typedef void LinkStack;
LinkStack* LinkStack_Create();
void LinkStack_Destroy(LinkStack* stack);
void LinkStack_Clear(LinkStack* stack);
int LinkStack_Push(LinkStack* stack, void* item);
void* LinkStack_Pop(LinkStack* stack);
void* LinkStack_Top(LinkStack* stack);
int LinkStack_Size(LinkStack* stack);
#endif
5.#include <stdio.h>
#include <stdlib.h>
#include "LinkStack.h"
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
//判断左符号
int isLeft(char c)
{
int ret = 0;
switch(c)
{
case ‘<‘:
case ‘(‘:
case ‘[‘:
case ‘{‘:
case ‘\‘‘:
case ‘\"‘:
ret = 1;
break;
default:
ret = 0;
break;
}
return ret;
}
//判断右符号
int isRight(char c)
{
int ret = 0;
switch(c)
{
case ‘>‘:
case ‘)‘:
case ‘]‘:
case ‘}‘:
case ‘\‘‘:
case ‘\"‘:
ret = 1;
break;
default:
ret = 0;
break;
}
return ret;
}
//实现相互匹配
int match(char left, char right)
{
int ret = 0;
switch(left)
{
case ‘<‘:
ret = (right == ‘>‘);
break;
case ‘(‘:
ret = (right == ‘)‘);
break;
case ‘[‘:
ret = (right == ‘]‘);
break;
case ‘{‘:
ret = (right == ‘}‘);
break;
case ‘\‘‘:
ret = (right == ‘\‘‘);
break;
case ‘\"‘:
ret = (right == ‘\"‘);
break;
default:
ret = 0;
break;
}
return ret;
}
//
int scanner(const char* code)
{
LinkStack* stack = LinkStack_Create();
int ret = 0;
int i = 0;
while( code[i] != ‘\0‘ )
{
if( isLeft(code[i]) )
{
//压栈
LinkStack_Push(stack, (void*)(code + i));
}
if( isRight(code[i]) )
{
//弹出栈点元素
char* c = (char*)LinkStack_Pop(stack);
//math匹配成功 返回1 失败返回0
if( (c == NULL) || !match(*c, code[i]) )
{
printf("%c does not match!\n", code[i]);
ret = 0;
break;
}
}
i++;
}
if( (LinkStack_Size(stack) == 0) && (code[i] == ‘\0‘) )
{
printf("Succeed!\n");
ret = 1;
}
else
{
printf("Invalid code!\n");
ret = 0;
}
LinkStack_Destroy(stack);
return ret;
}
int main(int argc, char *argv[])
{
const char* code = "#include <stdio.h> int main() { int a[5][5]; int (*p)[4]; p = a[0]; printf(\"%d\\n\", &p[3][3] - &a[3][3]); return 0; }";
scanner(code);
return 0;
}
栈的的语法匹配实现