Fix un-expansion of macros when the spacing around its use is changed by translation

Author: Hackerpilot

client/bqms_run/macros.py

@@ -235,8 +235,6 @@ def __init__(
             target_bind_generator: A function that format parameter in a way that it's detected as bind parameter in target dialect
         """
         super().__init__(mapping)
-        # what if we have mapping and wrap it here.
-        pattern = f"([=\\(, \\[]?){pattern}"
         self.pattern = re.compile(pattern, re.I)
         self.source_bind_generator = source_bind_generator
         self.target_bind_generator = target_bind_generator
@@ -245,18 +243,17 @@ def __init__(
         self.value_stripper = re.compile(value_stripper)
 
     def _substitution(self, path: Path, match: Match[str]) -> str:
-        prefix = match.group(1)
-        macro_name = match.group(2)
+        macro_name = match.group(1)
         full_match = match.group(0)
         if self.mapping and macro_name in self.mapping:
             replacement = self.mapping[macro_name]
             stripped_replacement = self.value_stripper.match(replacement).group(1)
-            if (stripped_replacement.isnumeric() or stripped_replacement.lower() in ("true", "false")) and prefix:
-                generated = '{}{}'.format(prefix, self.source_bind_generator(self.mapping[macro_name]))
-                reverse_search = '{}{}'.format(prefix, self.target_bind_generator(self.mapping[macro_name]))
+            if (stripped_replacement.isnumeric() or stripped_replacement.lower() in ("true", "false")):
+                generated = self.source_bind_generator(self.mapping[macro_name])
+                reverse_search = self.target_bind_generator(self.mapping[macro_name])
             else:
-                generated = '{}{}'.format(prefix,self.mapping[macro_name])
-                reverse_search = '{}{}'.format(prefix,self.mapping[macro_name])
+                generated = self.mapping[macro_name]
+                reverse_search = self.mapping[macro_name]
         else:
             self.warn_log(
                 "Could not expand '{0}' as it is not "

client/tests/unit/test_macros.py

@@ -20,6 +20,7 @@
     MacroExpanderRouter,
     PatternMacroExpander,
     SimpleMacroExpander,
+    ParameterAwareMacroExpander
 )
 
 
@@ -160,3 +161,71 @@ def test_basic_expand():
     assert expanded == "abcdef alpha.bravo ghijkl"
     un_expanded = expander.un_expand(pathlib.Path("abc.sql"), expanded)
     assert un_expanded == input_text
+
+def test_complex_1():
+    expander = MacroExpanderRouter(
+        {
+            "*.sql": ParameterAwareMacroExpander(
+                pattern="(\\[\\$\\w+\\])",
+                value_stripper='__bq__\\d+__(.*)__bq__\\d+__',
+                mapping={"[$table1]": "__bq__0__ABCDEF__bq__0__"},
+                source_bind_generator=lambda arg: "@"+arg,
+                target_bind_generator=lambda arg: arg
+            )
+        }
+    )
+
+    input_text="SELECT * FROM WXYZ.[$table1]"
+    expanded = expander.expand(pathlib.Path("abc.sql"), input_text)
+    assert expanded == "SELECT * FROM WXYZ.__bq__0__ABCDEF__bq__0__"
+    un_expanded = expander.un_expand(pathlib.Path("abc.sql"), expanded)
+    assert un_expanded == input_text
+
+def test_complex_2():
+    expander = MacroExpanderRouter(
+        {
+            "*.sql": ParameterAwareMacroExpander(
+                pattern="\\[\\$(\\w+)\\]",
+                value_stripper='__bq__\\d+__(.*)__bq__\\d+__',
+                mapping={
+                    "table1": "__bq__0__ABCDEF__bq__0__",
+                    "limit_val1": "__bq__1__5__bq__1__"
+                },
+                source_bind_generator=lambda arg: "@"+arg,
+                target_bind_generator=lambda arg: arg
+            )
+        }
+    )
+
+    input_text = "SELECT * FROM WXYZ.[$table1] LIMIT [$limit_val1]"
+    expanded = expander.expand(pathlib.Path("abc.sql"), input_text)
+    assert expanded == "SELECT * FROM WXYZ.__bq__0__ABCDEF__bq__0__ LIMIT @__bq__1__5__bq__1__"
+    expanded = "SELECT * FROM WXYZ.__bq__0__ABCDEF__bq__0__ LIMIT __bq__1__5__bq__1__"
+    un_expanded = expander.un_expand(pathlib.Path("abc.sql"), expanded)
+    assert un_expanded == input_text
+
+def test_unexpand_after_database_added():
+    expander = MacroExpanderRouter(
+        {
+            "*.sql": ParameterAwareMacroExpander(
+                pattern="(\\[\\$\\w+\\])",
+                value_stripper='__bq__\\d+__(.*)__bq__\\d+__',
+                mapping={
+                    "[$table]": "__bq__0__table__bq__0__",
+                },
+                source_bind_generator=lambda arg: "@"+arg,
+                target_bind_generator=lambda arg: arg
+            )
+        }
+    )
+
+    input_text = "CREATE TABLE [$table](a INT64);"
+    expanded = expander.expand(pathlib.Path("abc.sql"), input_text)
+    assert expanded == "CREATE TABLE __bq__0__table__bq__0__(a INT64);"
+    expanded = "CREATE TABLE db_name.__bq__0__table__bq__0__(a INT64);"
+    un_expanded = expander.un_expand(pathlib.Path("abc.sql"), expanded)
+    expected_output = "CREATE TABLE db_name.[$table](a INT64);"
+    assert un_expanded == expected_output
+
+
+