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The only way to get the next token was by consuming it. So then, our
parser starts to become hard to understand, once sometimes we just
want to take a look on the next token to understand what should be the
next kind of expression.
This commit introduces a new function that will help us to improve our
parser implementation.
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
Reviewed-by: Carlos Maniero <carlos@maniero.me>
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The +, -, *, and / tokens used to be TOKEN_OP, but the TOKEN_OP has been
removed and a token for each operation has been introduced. Python's
token names were followed: https://docs.python.org/3/library/token.html
Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Reviewed-by: Johnny Richard <johnny@johnnyrichar.com>
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We want to keep the code style consistent, this first commit adds a
.clang-format in order to "document" our style code.
This patch also adds a target *linter* to Makefile which will complain
if we have any style issue on test and src dirs.
I have run the follow command to create the .clang-format file:
$ clang-format -style=mozilla -dump-config > .clang-format
And I also made some adjusts to .clang-format changing the following
properties:
PointerAlignment: Right
ColumnLimit: 120
Commands executed to fix the current styling:
$ find . -name *.h | xargs clang-format -i
$ find . -name *.c | xargs clang-format -i
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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This patch implements the AST creation for arithmetic expressions.
NOTE:
The implementation works only for integer numbers.
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
Reviewed-by: Carlos Maniero <carlosmaniero@gmail.com>
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We want to tokenizer arithmetic expressions.
We are handling exceptional cases with UNKNOWN token.
Co-authored-by: Carlos Maniero <carlosmaniero@gmail.com>
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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This change fixes the memory leak when token got created.
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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In order to find out where a parsing error occurred, this patch
introduces the exactly location following the format 'file:row:col'.
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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This is a very limited parser implementation which parses a single
function with return type i32 and body containing a return number statement.
The parser doesn't show the 'filepath:row:col' when it fails, a future
improvement would be display it to easy find where the compilation
problem is located.
The ast_nodes are taking the token.value ownership (which is a really
bad design since not all token.value ownership has been taken causing
memory leaking) but we never free them. For a future fix we could use a
string_view instead since we never change the original source code. The
string_view will also improve the performance a lot avoiding unnecessary
heap memory allocation.
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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