Add plus tests

src_v2/parser/parser_internals.nim

@@ -114,6 +114,16 @@ proc str*(expectedString: string): parserFnT {.inline.} =
 
 # -- Parsing API
 
+proc plus*(parserFnA: parserFnT, parserFnB: parserFnT): parserFnT {.inline.} =
+  ## Creates parser function with combining two parser functions `parserFnA` plus `parserFnB`
+  return proc(parser: Parser): ParserResult =
+    parserFnA(parser).flatMap(parserFnB)
+
+proc `+`*(parserFnA: parserFnT, parserFnB: parserFnT): parserFnT {.inline.} =
+  ## Creates infix parser function with combining two parser functions `parserFnA` plus `parserFnB`
+  return proc(parser: Parser): ParserResult =
+    parserFnA(parser).flatMap(parserFnB)
+
 proc optional*(parserFn: parserFnT): parserFnT {.inline.} =
   ## Creates parser function with a nested `parserFn`:
   ## Continues on succesful parser
@@ -179,12 +189,6 @@ proc choice*(parserFns: seq[parserFnT]): parserFnT {.inline} =
       proc(x: ParserResult): ParserResult = x,
     )
 
-
-proc `+`*(parserFnA: parserFnT, parserFnB: parserFnT): parserFnT {.inline.} =
-  ## Parse characters and ignore failure
-  return proc(parser: Parser): ParserResult =
-    parserFnA(parser).flatMap(parserFnB)
-
 proc parseSeq*(parser: ParserResult, xs: seq[parserFnT]): ParserResult {.inline.} =
   xs.foldl(a.flatMap(b), parser)
 
@@ -258,6 +262,10 @@ when isMainModule:
     assert testParser123.flatMap(str("123")).isStreamCompleted() == true
 
   block testParsingApi:
+    # plus, +
+    assert testAbc1Parser.flatMap(str("abc") + ch('1')).tokensToString() == "abc1"
+    assert testParser123.flatMap(str("12").plus(digit)).tokensToString() == "123"
+
     # optional
     assert testParser123.flatMap(optional(ch('1'))).tokensToString() == "1"
     assert testParser123.flatMap(optional(ch('2'))).tokensToString() == ""