roccojiang / traversal-lang Goto Github PK
View Code? Open in Web Editor NEWTraversal programming language, designed to bridge the gap between block-based and text-based languages
Traversal programming language, designed to bridge the gap between block-based and text-based languages
Error reports should also specify the error type, not just the error message. Perhaps use the logging
library?
As of commit 14689be, comparison operators are completely handled by the Python interpreter. Custom rules should be added to enforce:
If there is one (and only one) newline at the end of test.txt, no errors are thrown. However, if there is a newline anywhere else or more than one at the end of the file, the ValueError: Ran into a $end token where it wasn't expected
error is thrown.
Just in general
Currently the parser takes input from test.txt
line-by-line, as written in main.py
, because the parser currently cannot take in multi-line input and can only deal with one line. This 'hacky' approach will have to be eventually rewritten to support more complex code.
A weird effect of this implementation is that a newline must be present at the end of test.txt
, as every line has to be terminated with a \n
character.
Because the parser can only parse one line of text, main.py
takes text line-by-line from test.txt
to 'feed' into the parser. This isn't necessarily an issue but I'll leave this here as a reminder in case I want to come back to this in the future.
Due to how a NEWLINE token is used to end a line of input, the parser does not ignore \n
characters. This means that any extra newlines will raise an error.
Due to the parsing grammar of Traversal, certain whitespace characters (sometimes spaces, especially tabs) cause errors when placed at the end of lines. This causes a lot of confusion as the error messages aren't very indicative of the actual error.
As of commit 4239769, certain comparison operator rules may cause some confusing grammar. These rules should be considered and potentially modified in the future.
Due to booleans no longer being treated as integers:
1 = 1 = 1
evaluates to false
as this becomes true = 1
<=
, <
, >=
, or >
which makes senseDue to strings being unable to be compared using <=
, <
, >=
, or >
:
"hello" <= "hello"
throws an error even though technically it could be seen as true
?Comment tokens have been replaced by using regex to ignore all text following //, thus all old code referring to COMMENT tokens should be removed
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