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License: MIT License
Let's Build A Simple Interpreter
License: MIT License
I want to make a compiler for a c++ like language and I want to know how I can change PROCEDURE to functions?
I've tried to generate AST in part18 using genastdot.py
, but it raised AttributeError: 'ProcedureDecl' object has no attribute 'params'
.
This can be fixed by altering self.formal_params
on self.params
in ProcedureDecl
class.
As you metioned in the articles!
Line 581 in 83746bd
It currently reads """proccall_statement : ID LPAREN expr? (COMMA expr)* RPAREN"""
I believe the correct version is """proccall_statement : ID LPAREN (expr (COMMA expr)*)? RPAREN"""
, because otherwise foobar(, b, c)
would be valid.
If I'm right, then the only additional change is that the while loop
Line 592 in 83746bd
Hello sir~
I love this series post, It's a great tutorial, so, When is the next post coming out๏ผ
Hello,
I'm currently going through your tutorial on "Lets build a simple interpreter".
I enjoy reading the tutorial, but I don't really understand why the change in Symbol and SymbolTable from chapter 11 to chapter 13, where much of what we already have defined, you want us to redefine?
Also I encountered, something I don't really understand with the VarSymbol scope property...
I fail to see where VarSymbol.scope.scope_level is defined,
This is from the https://github.com/rspivak/lsbasi/blob/master/part14/src2srccompiler.py#L171
var_name = node.value
var_symbol = self.current_scope.lookup(var_name)
if var_symbol is None:
raise Exception(
"Error: Symbol(identifier) not found '%s'" % var_name
)
scope_level = str(var_symbol.scope.scope_level)
return '<%s:%s>' % (var_name + scope_level, var_symbol.type.name)
and roaming around in your spi.py, I cannot find the link to .scope is it possible for you to help me out?
Thanks in advance
Thank you so much for making your Let's build a simple interpreter series, it's really helping me learn how interpreters work while I'm making my own programming language in JavaScript ๐
I am trying to make an interpreter of Swarm programing language. If you have some ideas or advices, please contact me.
Here is the repo link.
In spi.py (https://github.com/rspivak/lsbasi/blob/master/part15/spi.py), the skip_comment() function (starts on line 172) does not properly handle input source that contains an un-terminated comment.
For example, when run on the input below, spi.py hangs:
PROGRAM Test;
VAR
a : INTEGER;
BEGIN
a := 10 * 25; { Un-terminated comment. FREEZE!
END.
Given the fantastic work you've done so far, its a real shame to leave it hanging, the work with nested scopes is fantastic and brilliantly explained.
A great topic for the next instalment might be IF blocks with their own scopes
From there you only need some rudimentary input / output and you have a much more complete set of articles...
Hi,
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