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Nasal-Interpreter
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update

This commit is contained in:
Valk Richard Li 2020-05-29 10:25:48 -07:00 committed by GitHub
parent 3655e20a6c
commit 24bfbd8f0e
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 29 additions and 34 deletions
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63
version2.0/nasal_lexer.h
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@ -174,42 +174,40 @@ void resource_file::print_resource()
int size=source_code.size();
int line=1;
std::cout<<line<<"\t";
std::string unicode_str="";
for(int i=0;i<size;++i)
{
if(source_code[i]>=0 && unicode_str.length())
{
std::cout<<unicode_str;
unicode_str="";
}
if(32<=source_code[i]) std::cout<<source_code[i];
else if(source_code[i]<0)
{
// print unicode
std::string tmp="";
for(;i<size;++i)
{
if(source_code[i]>=0) break;
tmp.push_back(source_code[i]);
}
std::cout<<tmp;--i;
}
else if(source_code[i]<0) unicode_str+=source_code[i];
else std::cout<<" ";
if(i<size && source_code[i]=='\n')
if(source_code[i]=='\n')
{
++line;
std::cout<<std::endl<<line<<"\t";
}
}
if(unicode_str.length())
std::cout<<unicode_str;
std::cout<<std::endl;
return;
}
std::string nasal_lexer::identifier_gen(std::vector<char>& res,int& ptr,int& line)
{
int res_size=res.size();
std::string token_str="";
while(IS_IDENTIFIER_BODY(res[ptr]))
while(ptr<res_size && IS_IDENTIFIER_BODY(res[ptr]))
{
token_str+=res[ptr];
++ptr;
if(ptr>=res.size()) break;
}
// check dynamic identifier "..."
if(ptr+2<res.size() && res[ptr]=='.' && res[ptr+1]=='.' && res[ptr+2]=='.')
if(ptr+2<res_size && res[ptr]=='.' && res[ptr+1]=='.' && res[ptr+2]=='.')
{
token_str+="...";
ptr+=3;
@ -220,9 +218,10 @@ std::string nasal_lexer::identifier_gen(std::vector<char>& res,int& ptr,int& lin
std::string nasal_lexer::number_gen(std::vector<char>& res,int& ptr,int& line)
{
int res_size=res.size();
bool scientific_notation=false;// numbers like 1e8 are scientific_notation
std::string token_str="";
while(IS_NUMBER_BODY(res[ptr]))
while(ptr<res_size && IS_NUMBER_BODY(res[ptr]))
{
token_str+=res[ptr];
if(res[ptr]=='e' || res[ptr]=='E')
@ -232,17 +231,15 @@ std::string nasal_lexer::number_gen(std::vector<char>& res,int& ptr,int& line)
break;
}
++ptr;
if(ptr>=res.size())
break;
}
if(scientific_notation && ptr<res.size())
if(scientific_notation && ptr<res_size)
{
if(res[ptr]=='-')
{
token_str+='-';
++ptr;
}
while(ptr<res.size() && '0'<=res[ptr] && res[ptr]<='9')
while(ptr<res_size && '0'<=res[ptr] && res[ptr]<='9')
{
token_str+=res[ptr];
++ptr;
@ -258,11 +255,12 @@ std::string nasal_lexer::number_gen(std::vector<char>& res,int& ptr,int& line)
}
std::string nasal_lexer::string_gen(std::vector<char>& res,int& ptr,int& line)
{
int res_size=res.size();
std::string token_str="";
char str_begin=res[ptr];
++ptr;
if(ptr>=res.size()) return token_str;
while(ptr<res.size() && res[ptr]!=str_begin)
if(ptr>=res_size) return token_str;
while(ptr<res_size && res[ptr]!=str_begin)
{
token_str+=res[ptr];
if(res[ptr]=='\n') ++line;
@ -281,14 +279,12 @@ std::string nasal_lexer::string_gen(std::vector<char>& res,int& ptr,int& line)
}
}
++ptr;
if(ptr>=res.size()) break;
}
// check if this string ends with a " or '
if(ptr>=res.size())
if(ptr>=res_size)
{
++error;
std::cout<<">> [Lexer] line "<<line<<": this string must have a \' "<<str_begin<<" \' as its end."<<std::endl;
--ptr;
}
++ptr;
return token_str;
@ -329,18 +325,17 @@ void nasal_lexer::scanner(std::vector<char>& res)
detail_token_list.clear();
error=0;
int line=1;
int line=1,ptr=0,res_size=res.size();
std::string token_str;
int ptr=0;
while(ptr<res.size())
while(ptr<res_size)
{
while(ptr<res.size() && (res[ptr]==' ' || res[ptr]=='\n' || res[ptr]=='\t' || res[ptr]=='\r' || res[ptr]<0))
while(ptr<res_size && (res[ptr]==' ' || res[ptr]=='\n' || res[ptr]=='\t' || res[ptr]=='\r' || res[ptr]<0))
{
// these characters will be ignored, and '\n' will cause ++line
if(res[ptr]=='\n') ++line;
++ptr;
}
if(ptr>=res.size()) break;
if(ptr>=res_size) break;
if(IS_IDENTIFIER_HEAD(res[ptr]))
{
token_str=identifier_gen(res,ptr,line);
@ -399,7 +394,7 @@ void nasal_lexer::scanner(std::vector<char>& res)
else if(IS_NOTE_HEAD(res[ptr]))
{
// avoid note
while(ptr<res.size() && res[ptr]!='\n')
while(ptr<res_size && res[ptr]!='\n')
++ptr;
// after this process ptr will point to a '\n'
// don't ++ptr then the counter for line can work correctly
@ -464,11 +459,11 @@ void nasal_lexer::generate_detail_token()
else
{
std::string tempstr=i->str;
int strback=tempstr.length()-1;
if(tempstr.length()>3 &&tempstr[strback]=='.' && tempstr[strback-1]=='.' && tempstr[strback-2]=='.')
int len=tempstr.length(),strback=tempstr.length()-1;
if(tempstr[strback]=='.' && tempstr[strback-1]=='.' && tempstr[strback-2]=='.')
{
detail_token.str="";
for(int j=0;j<tempstr.length()-3;++j)
for(int j=0;j<len-3;++j)
detail_token.str+=tempstr[j];
detail_token.type=__dynamic_id;
}