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Document & Test optional

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This commit is contained in:
Florian Schroedl
2022-08-26 16:39:20 +02:00
parent 3bbf6834c3
commit f60ddaf19d
1 changed files with 8 additions and 1 deletions
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9
src_v2/parser/parser_internals.nim
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@@ -114,7 +114,9 @@ proc str*(expectedString: string): parserFnT {.inline.} =
# -- Parsing API # -- Parsing API
proc optional*(parserFn: parserFnT): parserFnT {.inline.} = proc optional*(parserFn: parserFnT): parserFnT {.inline.} =
## Create a ## Creates parser function with a nested `parserFn`.
## Continue on succesful parser
## Ignores failing parsers
return proc(parser: Parser): ParserResult = return proc(parser: Parser): ParserResult =
let newParser = parserFn(parser) let newParser = parserFn(parser)
@@ -271,3 +273,8 @@ when isMainModule:
assert initParserResult("12").flatMap(ch1).isStreamCompleted() == false assert initParserResult("12").flatMap(ch1).isStreamCompleted() == false
assert initParserResult("").flatMap(ch1).isStreamCompleted() == false assert initParserResult("").flatMap(ch1).isStreamCompleted() == false
assert testParser123.flatMap(str("123")).isStreamCompleted() == true assert testParser123.flatMap(str("123")).isStreamCompleted() == true
block testParsingApi:
# Optional
assert testParser123.flatMap(optional(ch('1'))).tokensToString() == "1"
assert testParser123.flatMap(optional(ch('2'))).tokensToString() == ""