Fix #line directives

cxxheaderparser/lexer.py

@@ -19,7 +19,7 @@ if sys.version_info >= (3, 8):
 else:
     Protocol = object
 
-_line_re = re.compile(r'^#line (\d+) "(.*)"')
+_line_re = re.compile(r'^\#[\t ]*line (\d+) "(.*)"')
 _multicomment_re = re.compile("\n[\\s]+\\*")
 
 
@@ -176,7 +176,6 @@ class PlyLexer:
         # Comments
         "COMMENT_SINGLELINE",
         "COMMENT_MULTILINE",
-        "LINE_DIRECTIVE",
         "PRAGMA_DIRECTIVE",
         "INCLUDE_DIRECTIVE",
         "PP_DIRECTIVE",
@@ -438,12 +437,6 @@ class PlyLexer:
             t.type = t.value
         return t
 
-    @TOKEN(r'\#[\t ]*line (\d+) "(.*)"')
-    def t_LINE_DIRECTIVE(self, t: LexToken) -> None:
-        m = t.lexmatch
-        self.filename = m.group(2)
-        self.line_offset = 1 + self.lex.lineno - int(m.group(1))
-
     @TOKEN(r"\#[\t ]*pragma")
     def t_PRAGMA_DIRECTIVE(self, t: LexToken) -> LexToken:
         return t
@@ -454,6 +447,12 @@ class PlyLexer:
 
     @TOKEN(r"\#(.*)")
     def t_PP_DIRECTIVE(self, t: LexToken):
+        # handle line macros
+        m = _line_re.match(t.value)
+        if m:
+            self.filename = m.group(2)
+            self.line_offset = 1 + self.lex.lineno - int(m.group(1))
+            return None
         # ignore C++23 warning directive
         if t.value.startswith("#warning"):
             return

tests/test_misc.py

@@ -1,5 +1,6 @@
 # Note: testcases generated via `python -m cxxheaderparser.gentest`
 
+from cxxheaderparser.errors import CxxParseError
 from cxxheaderparser.types import (
     BaseClass,
     ClassDecl,
@@ -22,6 +23,8 @@ from cxxheaderparser.simple import (
     ParsedData,
 )
 
+import pytest
+
 #
 # minimal preprocessor support
 #
@@ -93,6 +96,19 @@ def test_pragma_more() -> None:
     )
 
 
+def test_line_and_define() -> None:
+    content = """
+        // this should work + change line number of error
+        #line 40 "filename.h"
+        // this should fail
+        #define 1
+    """
+    with pytest.raises(CxxParseError) as e:
+        parse_string(content, cleandoc=True)
+
+    assert "filename.h:41" in str(e.value)
+
+
 #
 # extern "C"
 #