xxq250
/
Nasal-Interpreter
mirror of https://github.com/ValKmjolnir/Nasal-Interpreter.git
1
0
Fork 0
Code Issues Actions 1 Packages Projects Releases Wiki Activity

Add more notes

This commit is contained in:
Valk Richard Li 2019-08-28 03:38:32 -05:00 committed by GitHub
parent 31db9a47cd
commit a3b6de4588
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
version0.7/nasal_parser.h
View File

@ -320,6 +320,11 @@ class PDA
PDA() PDA()
{ {
stack_running_problem_check=false; stack_running_problem_check=false;
//when the DFS searched too deep (over 1024 levels) the stack_running_problem_check
//will be set to true then return ro the main_progress
//when main_progress finds that the stack_running_problem_check is true
//then main_progress ends with an error : stack out of range
//and return the line where the error occurred
} }
void stack_input(std::stack<parse_unit>& temp) void stack_input(std::stack<parse_unit>& temp)
{ {
@ -401,6 +406,10 @@ class PDA
{ {
if(!extend_comp_progress(comp_stack.top().type)) if(!extend_comp_progress(comp_stack.top().type))
{ {
//if after all search the real type
//can not be found,then recognized_stack
//returns all the tokens in it
//to make sure the next comparation works
while(!recognized_stack.empty()) while(!recognized_stack.empty())
{ {
main_stack.push(recognized_stack.top()); main_stack.push(recognized_stack.top());
@ -447,6 +456,8 @@ class PDA
} }
while((!comp_stack.empty()) && (!main_stack.empty())) while((!comp_stack.empty()) && (!main_stack.empty()))
{ {
//because of the check !omp_stack.empty()
//every token sequence should not be null
if(comp_stack.top().type==main_stack.top().type) if(comp_stack.top().type==main_stack.top().type)
{ {
comp_stack.pop(); comp_stack.pop();