Add support for SQL functions named left or right (#145)

These functions collide with SQL keywords such that they didn't parse before this change. But, they are valid PG function names, so these tokens should be included in the fn_name rule.

.deno/syntax/main.ne.ts

@@ -1621,6 +1621,8 @@ const grammar: Grammar = {
     {"name": "expr_fn_name$subexpression$2$subexpression$1", "symbols": [(lexerAny.has("kw_any") ? {type: "kw_any"} : kw_any)]},
     {"name": "expr_fn_name$subexpression$2$subexpression$1", "symbols": [(lexerAny.has("kw_some") ? {type: "kw_some"} : kw_some)]},
     {"name": "expr_fn_name$subexpression$2$subexpression$1", "symbols": [(lexerAny.has("kw_all") ? {type: "kw_all"} : kw_all)]},
+    {"name": "expr_fn_name$subexpression$2$subexpression$1", "symbols": [(lexerAny.has("kw_left") ? {type: "kw_left"} : kw_left)]},
+    {"name": "expr_fn_name$subexpression$2$subexpression$1", "symbols": [(lexerAny.has("kw_right") ? {type: "kw_right"} : kw_right)]},
     {"name": "expr_fn_name$subexpression$2", "symbols": ["expr_fn_name$subexpression$2$subexpression$1"], "postprocess":  x => track(x, {
             name: toStr(unwrap(x)),
         })},

src/syntax/expr.ne

@@ -287,7 +287,7 @@ expr_fn_name -> ((word %dot):?  word_or_keyword {% x => track(x, {
             name: unbox(unwrap(x[1])),
             ...x[0] && { schema: toStr(x[0][0]) },
         })  %})
-    | ((%kw_any | %kw_some | %kw_all) {% x => track(x, {
+    | ((%kw_any | %kw_some | %kw_all | %kw_left | %kw_right) {% x => track(x, {
             name: toStr(unwrap(x)),
         })%})
 

src/syntax/expr.spec.ts

@@ -1247,6 +1247,20 @@ line`,
             args: [],
         });
 
+        checkTreeExprLoc([`left('foo')`], {
+            _location: { start: 0, end: 11 },
+            type: 'call',
+            function: {
+                _location: { start: 0, end: 4 },
+                name: 'left'
+            },
+            args: [{
+                _location: { start: 5, end: 10 },
+                type: 'string',
+                value: 'foo'
+            }],
+        });
+
         checkTreeExprLoc([`pg_catalog.col_description(23208,4)`], {
             _location: { start: 0, end: 35 },
             type: 'call',