\u9996\u5148\u58f0\u660e\u4e00\u4e0b\u4ee5\u4e0b\u6587\u7ae0\u662f\u8ddf\u636e\u6211\u7528C#\u5199\u7684\u811a\u672c\u89e3\u91ca\u5668\u7684\u7ecf\u9a8c\u4e4b\u8c08\uff0c\u5982\u4e0d\u8ba4\u53ef\u4e5f\u8bf7\u4e0d\u8981\u627e\u672c\u4eba\u3002<\/p>\n
\u4e00\u822c\u5199\u4e2a\u811a\u672c\u89e3\u91ca\u5668\u9700\u8981\u4ee5\u4e0b\u7684\u6b65\u9aa4\uff1a<\/p>\n
\u6e90\u7a0b\u5e8f\uff0d\u8bcd\u6cd5\u5206\u6790\uff0d\u8bed\u6cd5\u5206\u6790\uff0d\u751f\u6210\u4e2d\u95f4\u4ee3\u7801\uff0d\u89e3\u91ca\u4e2d\u95f4\u4ee3\u7801<\/p>\n
\u4e00\u3001\u6211\u5199\u7684\u811a\u672c\u89e3\u91ca\u5668\u5c31\u662f\u8ddf\u636e\u4e0a\u9762\u7684\u8fc7\u7a0b\u5199\u7684\uff0c\u4e0b\u9762\u8bf4\u660e\u4e00\u4e0b\u672c\u811a\u672c\u89e3\u91ca\u5668\u7684\u8bed\u6cd5\u3002<\/p>\n
1\u3001\u8bed\u6cd5\u89c4\u5219\uff1a<\/p>\n
\uff081\uff09script_begin\u4ee3\u8868\u8bed\u53e5\u5f00\u59cb<\/p>\n
\uff082\uff09script_end\u4ee3\u8868\u8bed\u53e5\u7ed3\u675f<\/p>\n
\uff083\uff09\u6761\u4ef6\u8bed\u53e5\uff1aif \u8868\u8fbe\u5f0f \u8bed\u53e5 endif<\/p>\n
\uff084\uff09\u5faa\u73af\u8bed\u53e5\uff1awhile \u8868\u8fbe\u5f0f \u8bed\u53e5 endwhile<\/p>\n
\uff085\uff09\u8d4b\u503c\u8bed\u53e5\uff1a\u53d8\u91cf=\u8868\u8fbe\u5f0f<\/p>\n
\uff086\uff09\u8868\u8fbe\u5f0f\uff1a<\/p>\n
\uff08\u4e3a\u65b9\u4fbf\u6211\u4eec\u8fd9\u91cc\u4f7f\u7528\u4ea7\u751f\u5f0f\u6765\u8bf4\u660e\uff09<\/p>\n
expr->expr+term|expr-term|term|term>=term|term<=term|term==term|term!=term|term>term|term<term|term<\/p>\n
term->term*factor|term\/factor|factor<\/p>\n
factor->(expr)|\u6570\u5b57|\u53d8\u91cf|\u5b57\u7b26\u4e32|!\u53d8\u91cf<\/p>\n
(\u6ce8\u610f\uff1a\u4ea7\u751f\u5f0f\u4e2d\u7684->\u4ee3\u8868\u524d\u9762\u7684\u503c\u53ef\u4ee5\u662f\u540e\u9762\u4e2d\u7684\u4efb\u4f55\u4e00\u4e2a\u503c\uff0c|\u4ee3\u8868\u7740\u6216\u7684\u610f\u601d)<\/p>\n
\uff087\uff09\u53d8\u91cf\uff1a\u672c\u811a\u672c\u53ea\u6709\u5168\u5c40\u53d8\u91cf\uff0c\u6211\u4eec\u4f7f\u7528\u4e00\u4e2a\u7ed3\u6784\u7b26\u53f7\u8868\uff08\u53e6\u5916\u8fd9\u4e2a\u8868\u8fd8\u4fdd\u5b58\u7740\u5173\u952e\u5b57\u7b49\uff09\u6765\u4fdd\u5b58\u53d8\u91cf\u540d\u3001\u7c7b\u578b\uff08\u8bf4\u660e\u662f\u53d8\u91cf\u3001\u5173\u952e\u5b57\u7b49\uff09\u548c\u503c\u3002\u4ee5\u4e0b\u662f\u6b64\u7b26\u53f7\u8868\u7684\u5b9a\u4e49\uff1a<\/p>\n
public struct Symtable<\/p>\n
{<\/p>\n
public string value;<\/p>\n
public string valuestr;<\/p>\n
public int toketype;<\/p>\n
}<\/p>\n
Symtable[] m_table=new Symtable[max_size];<\/p>\n
max_size\u7684\u5927\u5c0f\u8bf4\u660e\u4e86\u672c\u811a\u672c\u53ef\u4ee5\u5b9a\u4e49\u7684\u53d8\u91cf\u6570\u6709\u591a\u5c11\u3002<\/p>\n
2\u3001\u8bcd\u6cd5\u5206\u6790\uff1a<\/p>\n
\u5728\u8fd9\u4e2a\u9636\u6bb5\u89e3\u91ca\u5668\u628a\u8bfb\u53d6\u7684\u5b57\u7b26\u5206\u4e3a\u4ee5\u4e0b\u7c7b\u578b:<\/p>\n
\uff081\uff09\u3001\u53d8\u91cf<\/p>\n
\uff082\uff09\u3001\u6570\u5b57<\/p>\n
\uff083\uff09\u3001\u5b57\u7b26\u4e32<\/p>\n
\uff084\uff09\u3001+\u3001\uff0d\u3001*\u3001\/\u7b49\u7b26\u53f7<\/p>\n
\uff085\uff09\u3001if\u3001while\u7b49\u5173\u952e\u5b57<\/p>\n
\u4ee5\u4e0b\u662f\u6b64\u8fc7\u7a0b\u7684\u4ee3\u7801\uff1a<\/p>\n
private int lexan(StreamReader sr)<\/p>\n
{<\/p>\n
m_tmpvalue = "";<\/p>\n
char t;<\/p>\n
while (true)<\/p>\n
{<\/p>\n
t = (char)sr.Read();<\/p>\n
if (sr.EndOfStream)<\/p>\n
{<\/p>\n
return -1;<\/p>\n
}<\/p>\n
if (t == ' ')<\/p>\n
{<\/p>\n
}<\/p>\n
else if (t == '\\r')<\/p>\n
{<\/p>\n
t = (char)sr.Read();<\/p>\n
if (t == '\\n')<\/p>\n
{<\/p>\n
error_line_num++;<\/p>\n
}<\/p>\n
}<\/p>\n
else if (Char.IsDigit(t))<\/p>\n
{<\/p>\n
while (Char.IsDigit(t))<\/p>\n
{<\/p>\n
m_tmpvalue += t;<\/p>\n
t = (char)sr.Peek();<\/p>\n
if (Char.IsDigit(t))<\/p>\n
{<\/p>\n
sr.Read();<\/p>\n
}<\/p>\n
}<\/p>\n
return m_numtype;<\/p>\n
}<\/p>\n
else if (isStrword(t))<\/p>\n
{<\/p>\n
while (isStrword(t))<\/p>\n
{<\/p>\n
m_tmpvalue += t;<\/p>\n
t = (char)sr.Peek();<\/p>\n
if (isStrword(t))<\/p>\n
{<\/p>\n
sr.Read();<\/p>\n
}<\/p>\n
}<\/p>\n
int p = LookUp(m_tmpvalue);<\/p>\n
if (p == -1)<\/p>\n
{<\/p>\n
p = InertTable(m_tmpvalue, m_idtype);<\/p>\n
}<\/p>\n
return m_symtable[p].toketype;<\/p>\n
}<\/p>\n
else if (isSingleword(t))<\/p>\n
{<\/p>\n
return (int)t;<\/p>\n
}<\/p>\n
else if (isDoubleword(t))<\/p>\n
{<\/p>\n
char tmpc = (char)sr.Peek();<\/p>\n
if (tmpc == '=')<\/p>\n
{<\/p>\n
sr.Read();<\/p>\n
if (t == '>')<\/p>\n
{<\/p>\n
return m_largede;<\/p>\n
}<\/p>\n
else if (t == '<')<\/p>\n
{<\/p>\n
return m_smallde;<\/p>\n
}<\/p>\n
else if (t == '!')<\/p>\n
{<\/p>\n
return m_bude;<\/p>\n
}<\/p>\n
else if (t == '=')<\/p>\n
{<\/p>\n
return m_dede;<\/p>\n
}<\/p>\n
else<\/p>\n
{<\/p>\n
CException.ScriptError("\u683c\u5f0f\u9519\u8bef!");<\/p>\n
}<\/p>\n
}<\/p>\n
return (int)t;<\/p>\n
}<\/p>\n
else if (t == '\\"')<\/p>\n
{<\/p>\n
t=(char)sr.Read();<\/p>\n
while (t != '\\"')<\/p>\n
{<\/p>\n
m_tmpvalue += t;<\/p>\n
t = (char)sr.Read();<\/p>\n
}<\/p>\n
return m_strtype;<\/p>\n
}<\/p>\n
else<\/p>\n
{<\/p>\n
CException.ScriptError("\u9519\u8bef\u683c\u5f0f");<\/p>\n
return -1;<\/p>\n
}<\/p>\n
}<\/p>\n
}<\/p>\n
2\u3001\u8bed\u6cd5\u5206\u6790\uff1a<\/p>\n
\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u5bf9\u8bfb\u53d6\u7684\u5b57\u7b26\u6309\u4ea7\u751f\u5f0f\u7684\u8fdb\u884c\u5206\u9636\u6bb5\u5904\u7406\uff1b\u8868\u8fbe\u5f0f\u4ece\u4e2d\u7f00\u53d8\u6210\u540e\u7f00\uff0c\u4e2d\u7f00\u5c31\u50cf3+4+5\u7684\u540e\u7f00\u5c31\u662f34+5+\u5e76\u9762\u5728\u540e\u7f00\u4e2d\u662f\u4e0d\u9700\u8981\u62ec\u53f7\u7684\u3002\u8fd9\u4e2a\u9636\u6bb5\u8fd8\u8981\u751f\u6210\u4e2d\u95f4\u4ee3\u7801\u3002<\/p>\n
\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
private void match(int t, StreamReader sr)
{
if (t == m_headtype)
{
m_headtype = lexan(sr);
}
else
{
CException.ScriptError("\u9519\u8bef\u683c\u5f0f");
}
}
private void WriteToMemory(string s)
{
m_zhongJingdaima += s;
}
public int stmtExplain(StreamReader sr)
{
if (m_headtype == m_begintype)
{
match(m_headtype, sr);
int ret = stmtExplain(sr);
while (ret != 0)
{
ret = stmtExplain(sr);
}
}
else if (m_headtype == m_endtype)
{
match(m_headtype, sr);
return 0;
}
else if (m_headtype == m_iftype)
{
WriteToMemory("label:" + label_line + "\\n");
label_line++;
match(m_headtype, sr);
expr(sr);
WriteToMemory("gofalse label:" + label_line + " \\n");<\/p>\n
stmtExplain(sr);
match(m_endif, sr);
WriteToMemory("label:" + label_line + "\\n");
label_line++;
}
else if (m_headtype == m_whiletype)
{
int tmplabel=label_line;
WriteToMemory("label:" + label_line + "\\n");
label_line++;
match(m_headtype, sr);
expr(sr);
WriteToMemory("gofalse label:" + label_line + " \\n");<\/p>\n
stmtExplain(sr);
match(m_endwhile, sr);
WriteToMemory("goto label:" + tmplabel + " \\n");
WriteToMemory("label:" + label_line + "\\n");
label_line++;
}
else if (m_headtype == m_funtiontype)
{
WriteToMemory("function ");
WriteToMemory(m_tmpvalue);<\/p>\n
WriteToMemory("\\n");
match(m_headtype, sr);
}
else if (m_headtype == m_idtype)
{<\/p>\n
int index = LookUp(m_tmpvalue);
WriteToMemory("lvalue " + m_tmpvalue + "\\n");
match(m_headtype, sr);
match('=', sr);
expr(sr);
WriteToMemory(":=\\n");
}
return 1;
}
private void expr(StreamReader sr)
{
term(sr);
while (true)
{
switch (m_headtype)
{
case '+':
{
match(m_headtype, sr);
term(sr);
WriteToMemory("+\\n");
continue;
}
case '-':
{
match(m_headtype, sr);
term(sr);
WriteToMemory("-\\n");
continue;
}
case m_largede:
{
match(m_headtype, sr);
term(sr);
WriteToMemory(">=\\n");
continue;
}<\/p>\n
case m_smallde:
{
match(m_headtype, sr);
term(sr);
WriteToMemory("<=\\n");
continue;
}
case m_bude:
{
match(m_headtype, sr);
term(sr);
WriteToMemory("!=\\n");
continue;
}
case m_dede:
{
match(m_headtype, sr);
term(sr);
WriteToMemory("==\\n");
continue;
}
case '>':
{
match(m_headtype, sr);
term(sr);
WriteToMemory(">\\n");
continue;
}
case '<':
{
match(m_headtype, sr);
term(sr);
WriteToMemory("<\\n");
continue;
}
default:
return;
}
}
}
private void term(StreamReader sr)
{
factor(sr);
while (true)
{
switch (m_headtype)
{
case '*':
{
match(m_headtype, sr);
factor(sr);
WriteToMemory("*\\n");
continue;
}
case '\/':
{
match(m_headtype, sr);
factor(sr);
WriteToMemory("\/\\n");
continue;
}
default:
return;
}
}
}
private void factor(StreamReader sr)
{
switch (m_headtype)
{
case '(':
{
match('(', sr);
expr(sr);
match(')', sr);
break;
}
case m_numtype:
{
WriteToMemory("push " + m_tmpvalue + "\\n");
match(m_numtype, sr);
break;
}
case m_idtype:
{
WriteToMemory("rvalue "+m_tmpvalue+"\\n");
match(m_idtype, sr);
break;
}
case m_strtype:
{
WriteToMemory("push " + m_tmpvalue + "\\n");
match(m_headtype, sr);
break;
}
case '!':
{
match(m_headtype, sr);
match(m_headtype, sr);
WriteToMemory("oppvalue "+m_tmpvalue+"\\n");
break;
}
case m_funtiontype:
{
WriteToMemory("function ");
WriteToMemory(m_tmpvalue);<\/p>\n
WriteToMemory("\\n");
match(m_headtype, sr);
break;
}
default:
CException.ScriptError("\u9519\u8bef\u683c\u5f0f!");
break;
}
}
private string ReadStrLine(string s)
{
int tmpindex = s.IndexOf("\\n",m_excuteline_index);
string tmpstr;
if (tmpindex != -1)
{
int readlength=tmpindex-m_excuteline_index;
tmpstr = s.Substring(m_excuteline_index,readlength);
m_excuteline_index = tmpindex+1;
}
else
{
return null;
}
return tmpstr;
}<\/p>\n
<\/p>\n
\u4e8c\u3001\u73b0\u5728\u6211\u4eec\u7684\u5df2\u628a\u4f60\u7684\u96be\u4ee5\u89e3\u91ca\u7684\u811a\u672c\u8bed\u8a00\u751f\u6210\u5bb9\u6613\u89e3\u91ca\u7684\u4e2d\u95f4\u4ee3\u7801\uff0c\u73b0\u5728\u5f00\u59cb\u89e3\u91ca\u4e2d\u95f4\u4ee3\u7801\uff0c\u4e3a\u5b8c\u6210\u8fd9\u4e2a\u76ee\u6807\u6211\u4eec\u5148\u770b\u4e0b\u4e2d\u95f4\u8bed\u8a00\u7684\u8bed\u6cd5\u89c4\u5219\uff1a<\/p>\n
\u4e2d\u95f4\u8bed\u6cd5\uff1a<\/p>\n
Push \/ \u628a\/\u538b\u6808<\/p>\n
Lvalue \/\u53d6\u503c\u538b\u6808<\/p>\n
+ \u5f39\u51fa\u6808\u9876\u4e24\u4e2a\u503c\u76f8\u52a0\u540e\u538b\u6808<\/p>\n
function \u51fd\u6570<\/p>\n
\u7b49\u7b49<\/p>\n
<\/p>\n
private void ExectStr()
{
string retstr;
retstr = ReadStrLine(m_zhongJingdaima);
while (retstr != null)
{
if (retstr.StartsWith("lvalue"))
{
string[] split = retstr.Split(new char[] { ' ' });
int index=LookUp(split[1]);
m_stack.push(Convert.ToString(index));
}
else if (retstr.StartsWith("function"))
{
string tmpvalue = retstr.Substring(9);
string pushvalue = null;
int paramstart = tmpvalue.IndexOf('(') + 1;
int paramend = tmpvalue.LastIndexOf(')');
int paramlength = paramend - paramstart;
string subparam = tmpvalue.Substring(paramstart, paramlength);
ArrayList split=new ArrayList();<\/p>\n
while (true)
{
string paramstr="";
int startindex=0;
if (subparam.StartsWith("\\""))
{
startindex = subparam.IndexOf("\\"", 1);
if (startindex == -1)
{
break;
}
paramstr = subparam.Substring(1, startindex - 1);
startindex = subparam.IndexOf(",", startindex);<\/p>\n
}
else
{
startindex = subparam.IndexOf(",", startindex);
if (startindex == -1)
{
paramstr = subparam;
}
else
{
paramstr = subparam.Substring(0, startindex);
}
int tmplookindex = LookUp(paramstr);
if (tmplookindex != -1)
{
paramstr = m_symtable[tmplookindex].value;
}
}
split.Add(paramstr);
if (startindex == -1)
{
break;
}
startindex++;
subparam = subparam.Substring(startindex);
}<\/p>\n
<\/p>\n
if (tmpvalue.StartsWith("Strcat"))
{
pushvalue = m_globalFunction.Strcat(split[0].ToString(), split[1].ToString());
}
else if (tmpvalue.StartsWith("StartSplit"))
{
pushvalue = m_globalFunction.StartSplit(split[0].ToString(), split[1].ToString());
}
else if (tmpvalue.StartsWith("NextSplit"))
{
pushvalue = m_globalFunction.NextSplit(split[0].ToString(), split[1].ToString());
}
else if (tmpvalue.StartsWith("GetSplit"))
{
pushvalue = m_globalFunction.GetSplit(split[0].ToString(), split[1].ToString(), Convert.ToInt32(split[2]));
}
else
{
CException.ScriptError("\u9519\u8bef\u683c\u5f0f!");
}
if (pushvalue != null)
{
m_stack.push(pushvalue);
}
}
else if (retstr.StartsWith("push"))
{
\/\/int index=retstr.IndexOf(' ', 0);
string tmpstr = retstr.Substring(5);
m_stack.push(tmpstr);
}
else if (retstr.StartsWith("oppvalue"))
{
string[] split = retstr.Split(new char[] { ' ' });
int index = LookUp(split[1]);
bool tmpbool = !Convert.ToBoolean(m_symtable[index].value);
m_stack.push(Convert.ToString(tmpbool));
}
else if (retstr.StartsWith("rvalue"))
{
string[] split = retstr.Split(new char[] { ' ' });
int index = LookUp(split[1]);
m_stack.push(m_symtable[index].value);
}
else if (retstr.StartsWith(":="))
{
string rtmpvalue = m_stack.pop();
string ltmpvalue = m_stack.pop();
m_symtable[Convert.ToInt32(ltmpvalue)].value = rtmpvalue;
}
else if (retstr.StartsWith("+"))
{
string ltmpvalue = m_stack.pop();
string rtmpvalue = m_stack.pop();
string totalvalue = Convert.ToString(Convert.ToInt32(ltmpvalue) + Convert.ToInt32(rtmpvalue));
m_stack.push(totalvalue);
}
else if (retstr.StartsWith("*"))
{
string rtmpvalue = m_stack.pop();
string ltmpvalue = m_stack.pop();
string totalvalue = Convert.ToString(Convert.ToInt32(ltmpvalue) * Convert.ToInt32(rtmpvalue));
m_stack.push(totalvalue);
}
else if (retstr.StartsWith("\/"))
{
string rtmpvalue = m_stack.pop();
string ltmpvalue = m_stack.pop();
string totalvalue = Convert.ToString(Convert.ToInt32(ltmpvalue) \/ Convert.ToInt32(rtmpvalue));
m_stack.push(totalvalue);
}
else if (retstr.StartsWith("-"))
{
string rtmpvalue = m_stack.pop();
string ltmpvalue = m_stack.pop();
string totalvalue = Convert.ToString(Convert.ToInt32(ltmpvalue) - Convert.ToInt32(rtmpvalue));
m_stack.push(totalvalue);
}
else if (retstr.StartsWith(">="))
{
string rtmpvalue = m_stack.pop();
string ltmpvalue = m_stack.pop();
if (Convert.ToInt32(ltmpvalue) >= Convert.ToInt32(rtmpvalue))
{
m_stack.push("true");
}
else
{
m_stack.push("false");
}
}
else if (retstr.StartsWith("!="))
{
string rtmpvalue = m_stack.pop();
string ltmpvalue = m_stack.pop();
if (Convert.ToInt32(ltmpvalue) != Convert.ToInt32(rtmpvalue))
{
m_stack.push("true");
}
else
{
m_stack.push("false");
}
}
else if (retstr.StartsWith("<="))
{
string rtmpvalue = m_stack.pop();
string ltmpvalue = m_stack.pop();
if (Convert.ToInt32(ltmpvalue) <= Convert.ToInt32(rtmpvalue))
{
m_stack.push("true");
}
else
{
m_stack.push("false");
}
}
else if (retstr.StartsWith(">"))
{
string rtmpvalue = m_stack.pop();
string ltmpvalue = m_stack.pop();
if (Convert.ToInt32(ltmpvalue) > Convert.ToInt32(rtmpvalue))
{
m_stack.push("true");
}
else
{
m_stack.push("false");
}
}
else if (retstr.StartsWith("<"))
{
string rtmpvalue = m_stack.pop();
string ltmpvalue = m_stack.pop();
if (Convert.ToInt32(ltmpvalue) < Convert.ToInt32(rtmpvalue))
{
m_stack.push("true");
}
else
{
m_stack.push("false");
}
}
else if (retstr.StartsWith("=="))
{
string rtmpvalue = m_stack.pop();
string ltmpvalue = m_stack.pop();
if (ltmpvalue == rtmpvalue)
{
m_stack.push("true");
}
else
{
m_stack.push("false");
}
}
else if (retstr.StartsWith("gofalse"))
{
string rtmpvalue = m_stack.pop();
if (!Convert.ToBoolean(rtmpvalue))
{
string[] split = retstr.Split(new char[] { ' ' });
string strtofind = split[1] + "\\n";
int tmppos = m_zhongJingdaima.IndexOf(strtofind);
m_excuteline_index = tmppos;
}
}
else if (retstr.StartsWith("gotrue"))
{
string rtmpvalue = m_stack.pop();
if (Convert.ToBoolean(rtmpvalue))
{
string[] split = retstr.Split(new char[] { ' ' });
string strtofind = split[1] + "\\n";
int tmppos = m_zhongJingdaima.IndexOf(strtofind);
m_excuteline_index = tmppos;
}
}
else if (retstr.StartsWith("goto"))
{
string[] split = retstr.Split(new char[] { ' ' });
string strtofind = split[1] + "\\n";
int tmppos = m_zhongJingdaima.IndexOf(strtofind);
m_excuteline_index = tmppos;
}
retstr = ReadStrLine(m_zhongJingdaima);
}
}<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
\u9996\u5148\u58f0\u660e\u4e00\u4e0b\u4ee5\u4e0b\u6587\u7ae0\u662f\u8ddf\u636e\u6211\u7528C#\u5199\u7684\u811a\u672c\u89e3\u91ca\u5668\u7684\u7ecf\u9a8c\u4e4b\u8c08\uff0c\u5982\u4e0d\u8ba4\u53ef\u4e5f\u8bf7\u4e0d\u8981\u627e\u672c\u4eba\u3002<\/p>\n
\u4e00\u822c\u5199\u4e2a\u811a\u672c\u89e3\u91ca\u5668\u9700\u8981\u4ee5\u4e0b\u7684\u6b65\u9aa4\uff1a<\/p>\n
\u6e90\u7a0b\u5e8f\uff0d\u8bcd\u6cd5\u5206\u6790\uff0d\u8bed\u6cd5\u5206\u6790\uff0d\u751f\u6210\u4e2d\u95f4\u4ee3\u7801\uff0d\u89e3\u91ca\u4e2d\u95f4\u4ee3\u7801<\/p>\n
\u4e00\u3001\u6211\u5199\u7684\u811a\u672c\u89e3\u91ca\u5668\u5c31\u662f\u8ddf\u636e\u4e0a\u9762\u7684\u8fc7\u7a0b\u5199\u7684\uff0c\u4e0b\u9762\u8bf4\u660e\u4e00\u4e0b\u672c\u811a\u672c\u89e3\u91ca\u5668\u7684\u8bed\u6cd5\u3002<\/p>\n
1\u3001\u8bed\u6cd5\u89c4\u5219\uff1a<\/p>\n
\uff081\uff09script_begin\u4ee3\u8868\u8bed\u53e5\u5f00\u59cb<\/p>\n
\uff082\uff09script_end\u4ee3\u8868\u8bed\u53e5\u7ed3\u675f<\/p>\n
\uff083\uff09\u6761\u4ef6\u8bed\u53e5\uff1aif \u8868\u8fbe\u5f0f \u8bed\u53e5 endif<\/p>\n
\uff084\uff09\u5faa\u73af\u8bed\u53e5\uff1awhile \u8868\u8fbe\u5f0f \u8bed\u53e5 endwhile<\/p>\n
\uff085\uff09\u8d4b\u503c\u8bed\u53e5\uff1a\u53d8\u91cf=\u8868\u8fbe\u5f0f<\/p>\n
\uff086\uff09\u8868\u8fbe\u5f0f\uff1a<\/p>\n
\uff08\u4e3a\u65b9\u4fbf\u6211\u4eec\u8fd9\u91cc\u4f7f\u7528\u4ea7\u751f\u5f0f\u6765\u8bf4\u660e\uff09<\/p>\n
expr->expr+term|expr-term|term|term>=term|term<=term|term==term|term!=term|term>term|term<term|term<\/p>\n
term->term*factor|term\/factor|factor<\/p>\n
factor->(expr)|\u6570\u5b57|\u53d8\u91cf|\u5b57\u7b26\u4e32|!\u53d8\u91cf<\/p>\n
(\u6ce8\u610f\uff1a\u4ea7\u751f\u5f0f\u4e2d\u7684->\u4ee3\u8868\u524d\u9762\u7684\u503c\u53ef\u4ee5\u662f\u540e\u9762\u4e2d\u7684\u4efb\u4f55\u4e00\u4e2a\u503c\uff0c|\u4ee3\u8868\u7740\u6216\u7684\u610f\u601d)<\/p>\n
\uff087\uff09\u53d8\u91cf\uff1a\u672c\u811a\u672c\u53ea\u6709\u5168\u5c40...<\/p>\n