implicit class DebugCombinators[P, A] extends AnyRef
This class enables the debug combinator on parsers.
This extension class operates on values that are convertible to parsers. It enables the use of
the debug combinator, which can be used to trace the execution through a parser.
- P
the type of base value that this class is used on (the conversion to
Parsley) is summoned automatically.
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- debug.scala
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new
DebugCombinators(p: P)(implicit con: (P) ⇒ Parsley[A])
This constructor should not be called manually, it is designed to be used via Scala's implicit resolution.
This constructor should not be called manually, it is designed to be used via Scala's implicit resolution.
- p
the value that this class is enabling methods on.
- con
a conversion that allows values convertible to parsers to be used.
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def
debug(name: String): Parsley[A]
This combinator allows this parser to be debugged by providing a trace through the execution.
This combinator allows this parser to be debugged by providing a trace through the execution.
When this combinator is entered, it will print the name assigned to the parser, as well as the current currenting input context for a few characters on either side. This parser is then executed. If it succeeded, this combinator again reports the name along with "
Good" and the input context. If it failed, it reports the name along with "Bad" and the input context.When breakpoints are used, the execution of the combinator will pause on either entry, exit, or both. The parse is resumed by entering a newline on standard input. Breakpoints will cause additional information about the internal state of the parser to be reported.
- name
The name to be assigned to this parser
scala> import parsley.debug.DebugCombinators, parsley.character.string, parsley.Parsley.attempt scala> val abc = attempt(string("abc").debug("string abc")).debug("attempt") scala> val abd = string("abd").debug("string abd") scala> val p = (abc <|> abd).debug("or") scala> p.parse("abd") >or> (1, 1): abd• ^ >attempt> (1, 1): abd• ^ >string abc> (1, 1): abd• ^ <string abc< (1, 3): abd• Fail ^ <attempt< (1, 1): abd• Fail ^ >string abd> (1, 1): abd• ^ <string abd< (1, 4): abd• Good ^ <or< (1, 4): abd• Good ^ val res0 = Success("abd")
Renders in colour with no break-point.
Example: -
def
debug(name: String, coloured: Boolean): Parsley[A]
This combinator allows this parser to be debugged by providing a trace through the execution.
This combinator allows this parser to be debugged by providing a trace through the execution.
When this combinator is entered, it will print the name assigned to the parser, as well as the current currenting input context for a few characters on either side. This parser is then executed. If it succeeded, this combinator again reports the name along with "
Good" and the input context. If it failed, it reports the name along with "Bad" and the input context.When breakpoints are used, the execution of the combinator will pause on either entry, exit, or both. The parse is resumed by entering a newline on standard input. Breakpoints will cause additional information about the internal state of the parser to be reported.
- name
The name to be assigned to this parser
- coloured
Whether to render with colour
scala> import parsley.debug.DebugCombinators, parsley.character.string, parsley.Parsley.attempt scala> val abc = attempt(string("abc").debug("string abc")).debug("attempt") scala> val abd = string("abd").debug("string abd") scala> val p = (abc <|> abd).debug("or") scala> p.parse("abd") >or> (1, 1): abd• ^ >attempt> (1, 1): abd• ^ >string abc> (1, 1): abd• ^ <string abc< (1, 3): abd• Fail ^ <attempt< (1, 1): abd• Fail ^ >string abd> (1, 1): abd• ^ <string abd< (1, 4): abd• Good ^ <or< (1, 4): abd• Good ^ val res0 = Success("abd")
No break-points.
Example: -
def
debug(name: String, break: Breakpoint): Parsley[A]
This combinator allows this parser to be debugged by providing a trace through the execution.
This combinator allows this parser to be debugged by providing a trace through the execution.
When this combinator is entered, it will print the name assigned to the parser, as well as the current currenting input context for a few characters on either side. This parser is then executed. If it succeeded, this combinator again reports the name along with "
Good" and the input context. If it failed, it reports the name along with "Bad" and the input context.When breakpoints are used, the execution of the combinator will pause on either entry, exit, or both. The parse is resumed by entering a newline on standard input. Breakpoints will cause additional information about the internal state of the parser to be reported.
- name
The name to be assigned to this parser
- break
The breakpoint properties of this parser, defaults to NoBreak
scala> import parsley.debug.DebugCombinators, parsley.character.string, parsley.Parsley.attempt scala> val abc = attempt(string("abc").debug("string abc")).debug("attempt") scala> val abd = string("abd").debug("string abd") scala> val p = (abc <|> abd).debug("or") scala> p.parse("abd") >or> (1, 1): abd• ^ >attempt> (1, 1): abd• ^ >string abc> (1, 1): abd• ^ <string abc< (1, 3): abd• Fail ^ <attempt< (1, 1): abd• Fail ^ >string abd> (1, 1): abd• ^ <string abd< (1, 4): abd• Good ^ <or< (1, 4): abd• Good ^ val res0 = Success("abd")
Renders in colour.
Example: -
def
debug(name: String, break: Breakpoint, coloured: Boolean): Parsley[A]
This combinator allows this parser to be debugged by providing a trace through the execution.
This combinator allows this parser to be debugged by providing a trace through the execution.
When this combinator is entered, it will print the name assigned to the parser, as well as the current currenting input context for a few characters on either side. This parser is then executed. If it succeeded, this combinator again reports the name along with "
Good" and the input context. If it failed, it reports the name along with "Bad" and the input context.When breakpoints are used, the execution of the combinator will pause on either entry, exit, or both. The parse is resumed by entering a newline on standard input. Breakpoints will cause additional information about the internal state of the parser to be reported.
- name
The name to be assigned to this parser
- break
The breakpoint properties of this parser, defaults to NoBreak
- coloured
Whether to render with colour (default true: render colours)
scala> import parsley.debug.DebugCombinators, parsley.character.string, parsley.Parsley.attempt scala> val abc = attempt(string("abc").debug("string abc")).debug("attempt") scala> val abd = string("abd").debug("string abd") scala> val p = (abc <|> abd).debug("or") scala> p.parse("abd") >or> (1, 1): abd• ^ >attempt> (1, 1): abd• ^ >string abc> (1, 1): abd• ^ <string abc< (1, 3): abd• Fail ^ <attempt< (1, 1): abd• Fail ^ >string abd> (1, 1): abd• ^ <string abd< (1, 4): abd• Good ^ <or< (1, 4): abd• Good ^ val res0 = Success("abd")
Example: - def debugError(name: String)(implicit errBuilder: ErrorBuilder[_]): Parsley[A]
- def debugError(name: String, coloured: Boolean)(implicit errBuilder: ErrorBuilder[_]): Parsley[A]
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