implement phrase operator

csrestructuredquery/query.py

@@ -105,3 +105,20 @@ def query(self) -> str:
         if self.boost:
             q += f" boost={self.boost}"
         return f"{q} {ExpressionValue(self.value)})"
+
+
+@dataclasses.dataclass(frozen=True)
+class Phrase(SpecializedOperator):
+    field: str
+    value: CsValue
+    boost: int = dataclasses.field(default=0)
+
+    @property
+    def name(self) -> str:
+        return "phrase"
+
+    def query(self) -> str:
+        q = f"({self.name} field={self.field}"
+        if self.boost:
+            q += f" boost={self.boost}"
+        return f"{q} {ExpressionValue(self.value)})"

tests/test_query.py

@@ -1,6 +1,6 @@
 from datetime import datetime
 
-from csrestructuredquery.query import Query, And, Or, Not, Near
+from csrestructuredquery.query import Query, And, Or, Not, Near, Phrase
 
 
 def test_文字列型と日時型は引用符で括られる():
@@ -33,3 +33,10 @@ def test_near演算子():
     assert operator.query() == "(near field=foo 'hoge')"
     operator = Near(field="foo", value="hoge", distance=2, boost=4)
     assert operator.query() == "(near field=foo distance=2 boost=4 'hoge')"
+
+
+def test_phrase演算子():
+    operator = Phrase(field="foo", value="hoge")
+    assert operator.query() == "(phrase field=foo 'hoge')"
+    operator = Phrase(field="foo", value="hoge", boost=4)
+    assert operator.query() == "(phrase field=foo boost=4 'hoge')"