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Valk Richard Li
2019-12-18 13:04:40 +08:00
committed by GitHub
parent 75948eb28b
commit 1c5cc21d72
4 changed files with 156 additions and 140 deletions
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version2.0/abstract_syntax_tree.h
+2 -78
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@@ -129,85 +129,9 @@ void abstract_syntax_tree::set_string(std::string __str)
return;
}
void abstract_syntax_tree::set_number(std::string _str)
void abstract_syntax_tree::set_number(std::string __str)
{
bool is_negative=false;
if(_str.length()>1 && _str[0]=='-')
{
// this statements only used in "input" function
// but in parse this statements are useless
// because lexer recognizes a number that begins with a '0'~'9' char
std::string temp="";
for(int i=1;i<_str.length();++i)
temp+=_str[i];
_str=temp;
is_negative=true;
}
if((int)_str.length()>2 && (_str[1]=='x' || _str[1]=='o'))
{
double num=0;
double pw=1;
if(_str[1]=='x') // hex
for(int i=(int)_str.length()-1;i>1;--i)
{
if('0'<=_str[i] && _str[i]<='9')
num+=(_str[i]-'0')*pw;
else if('a'<=_str[i] && _str[i]<='f')
num+=(10+_str[i]-'a')*pw;
else if('A'<=_str[i] && _str[i]<='F')
num+=(10+_str[i]-'A')*pw;
pw*=16;
}
else // oct
for(int i=(int)_str.length()-1;i>1;--i)
{
num+=(_str[i]-'0')*pw;
pw*=8;
}
number=num;
if(is_negative)
number*=-1;
return;
}
int dot_place=-1;
for(int i=0;i<(int)_str.length();++i)
if(_str[i]=='.')
{
dot_place=i;
break;
}
if(dot_place==-1)
{
// integer
number=0;
double pw=1;
for(int i=(int)_str.length()-1;i>=0;--i)
{
number+=(_str[i]-'0')*pw;
pw*=10;
}
if(is_negative)
number*=-1;
}
else
{
// float
number=0;
double pw=0.1;
for(int i=dot_place+1;i<(int)_str.length();++i)
{
number+=(_str[i]-'0')*pw;
pw/=10;
}
pw=1;
for(int i=dot_place-1;i>=0;--i)
{
number+=(_str[i]-'0')*pw;
pw*=10;
}
if(is_negative)
number*=-1;
}
number=trans_string_to_number(__str);
return;
}