Fix expr parsing - Githubissues

project-langx / X

A placeholder language with shareable bytecode IR.

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Closed frankhart2018 closed 3 years ago

frankhart2018 commented 3 years ago

expr -> string is a very näive grammar. Convert it to a full scale grammar, refer:- http://www2.lawrence.edu/fast/GREGGJ/CMSC270/parser/parser.html

The grammar will be:

expr -> sum
sum -> mul (+|- mul)
mul -> factor (*|/ factor)
factor -> term
term -> string | number