编译原理实验报告词法分析

}

else if(vec[i][0]=='\\'') {

pair pp(_W,vec[i]);//标识符 temp.push_back(pp); }

else if(vec[i][0]=='?') {

pair pp(_X,vec[i]);//标识符 temp.push_back(pp); }

else if(vec[i]==\ {

if(vec[i+1]==\ {

string jk=vec[i];

jk.append(vec[++i],0,1); pair pp(_O,jk); temp.push_back(pp); continue; }

else if(vec[i+1]==\ {

string jk=vec[i];

jk.append(vec[++i],0,1); pair pp(_L,jk); temp.push_back(pp); continue; }

else if((vec[i-1]==\ {

string jk=vec[i]; jk.append(vec[++i]);

pair pp(_NUM,jk); temp.push_back(pp); continue; } else {

pair pp(_PLUS,vec[i]);//标识符 temp.push_back(pp); } }

else if(vec[i]==\ {

if(vec[i+1]==\ {

string jk=vec[i];

jk.append(vec[++i],0,1); pair pp(_P,jk);

temp.push_back(pp); continue; }

else if(vec[i+1]==\ {

string jk=vec[i];

jk.append(vec[++i],0,1); pair pp(_M,jk); temp.push_back(pp); continue; }

else if(vec[i+1]==\ {

string jk=vec[i];

jk.append(vec[++i],0,1); pair pp(_N,jk); temp.push_back(pp); continue; }

else if((vec[i-1]==\ {

string jk=vec[i]; jk.append(vec[++i]);

pair pp(_NUM,jk); temp.push_back(pp); continue; } else {

pair pp(_SUB,vec[i]);//标识符 temp.push_back(pp); } }

else if(vec[i][0]<='9'&&vec[i][0]>='0') {

pair pp(_NUM,vec[i]); temp.push_back(pp); } else {

pair pp(_ID,vec[i]);//标识符 temp.push_back(pp); } }

else if((vec[i][0]<='9'&&vec[i][0]>='0')||vec[i][0]=='.') {

if(!isnum(vec[i]))ERROR_NUM++;

else if((vec[i+1][0]=='+'||vec[i+1][0]=='-')&&isnum(vec[i+2])) {

string jk=vec[i];

jk.append(vec[++i]); jk.append(vec[++i]);

pair pp(_NUM,jk); temp.push_back(pp); continue; } else{

pair pp(_NUM,vec[i]); temp.push_back(pp);} }

else if(iskey(vec[i])) {

pair pp(iskey(vec[i]),vec[i]); temp.push_back(pp); } else {

pair pp(_ID,vec[i]); temp.push_back(pp); } }

return temp; }

void OutFile(vector > v) {

string filename;

cout<<\请输入目标文件的路径及名称：\ cin>>filename;

ofstream outfile(filename.c_str()); if (!outfile) {

cerr<<\无法打开文件! \ exit(-1); } int i;

for(i=0;i

outfile<<\

cout<<\词法编译工作完成！文件已经保存到\ outfile.close(); return; }