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bug: Parse errors with preprocessor conditionals #308
Description
Did you check existing issues?
- I have read all the tree-sitter docs if it relates to using the parser
- I have searched the existing issues of tree-sitter-cpp
Tree-Sitter CLI Version, if relevant (output of tree-sitter --version)
tree-sitter 0.25.3 (2a835ee029dca1c325e6f1c01dbce40396f6123e)
Describe the bug
When parsing code with preprocessor conditionals, the parse tree reports errors in valid code. For example, given the following snippet:
#include <iostream>
#define ONE
int main()
{
int x =
#ifdef ONE
1
#else
2
#endif
;
std::cout << x;
return 0;
}the following errors are reported:
(ERROR [5, 2] - [5, 9])
(ERROR [7, 2] - [7, 3])
(ERROR [9, 2] - [9, 3])
These errors seem to correspond to the int x = assignment and the conditional values 1 and 2, even though the code is syntactically valid.
Steps To Reproduce/Bad Parse Tree
- Write the code above in a C++ file.
- Run
tree-sitter parseon the file. - Observe the obtained parse tree:
(translation_unit [0, 0] - [17, 0]
(preproc_include [0, 0] - [1, 0]
path: (system_lib_string [0, 9] - [0, 19]))
(preproc_def [1, 0] - [2, 0]
name: (identifier [1, 8] - [1, 11]))
(function_definition [3, 0] - [16, 1]
type: (primitive_type [3, 0] - [3, 3])
declarator: (function_declarator [3, 4] - [3, 10]
declarator: (identifier [3, 4] - [3, 8])
parameters: (parameter_list [3, 8] - [3, 10]))
body: (compound_statement [4, 0] - [16, 1]
(ERROR [5, 2] - [5, 9]
type: (primitive_type [5, 2] - [5, 5])
(identifier [5, 6] - [5, 7]))
(preproc_ifdef [6, 0] - [10, 6]
name: (identifier [6, 7] - [6, 10])
(ERROR [7, 2] - [7, 3]
(number_literal [7, 2] - [7, 3]))
alternative: (preproc_else [8, 0] - [8, 5])
(ERROR [9, 2] - [9, 3]
(number_literal [9, 2] - [9, 3])))
(expression_statement [11, 2] - [11, 3])
(expression_statement [13, 2] - [13, 17]
(binary_expression [13, 2] - [13, 16]
left: (qualified_identifier [13, 2] - [13, 11]
scope: (namespace_identifier [13, 2] - [13, 5])
name: (identifier [13, 7] - [13, 11]))
right: (identifier [13, 15] - [13, 16])))
(return_statement [15, 2] - [15, 11]
(number_literal [15, 9] - [15, 10])))))
Expected Behavior/Parse Tree
The parser should correctly handle this code without generating errors.
Repro
#include <iostream>
#define ONE
int main()
{
int x =
#ifdef ONE
1
#else
2
#endif
;
std::cout << x;
return 0;
}
Activity