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>Text.ParserCombinators.ReadPrec</TITLE
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>base-4.1.0.0: Basic libraries</TD
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>Text.ParserCombinators.ReadPrec</FONT
></TD
><TD ALIGN="right"
><TABLE CLASS="narrow" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="infohead"
>Portability</TD
><TD CLASS="infoval"
>non-portable (uses Text.ParserCombinators.ReadP)</TD
></TR
><TR
><TD CLASS="infohead"
>Stability</TD
><TD CLASS="infoval"
>provisional</TD
></TR
><TR
><TD CLASS="infohead"
>Maintainer</TD
><TD CLASS="infoval"
>libraries@haskell.org</TD
></TR
></TABLE
></TD
></TR
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><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="section4"
><B
>Contents</B
></TD
></TR
><TR
><TD
><DL
><DT
><A HREF="#1"
>Precedences
</A
></DT
><DT
><A HREF="#2"
>Precedence operations
</A
></DT
><DT
><A HREF="#3"
>Other operations
</A
></DT
><DT
><A HREF="#4"
>Converters
</A
></DT
></DL
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Description</TD
></TR
><TR
><TD CLASS="doc"
>This library defines parser combinators for precedence parsing.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Synopsis</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A HREF="#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>type</SPAN
> <A HREF="#t%3APrec"
>Prec</A
> = <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AminPrec"
>minPrec</A
> :: <A HREF="Text-ParserCombinators-ReadPrec.html#t%3APrec"
>Prec</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Alift"
>lift</A
> ::  <A HREF="Text-ParserCombinators-ReadP.html#t%3AReadP"
>ReadP</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Aprec"
>prec</A
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3APrec"
>Prec</A
> -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Astep"
>step</A
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Areset"
>reset</A
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Aget"
>get</A
> :: <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> <A HREF="../ghc-prim/GHC-Types.html#t%3AChar"
>Char</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Alook"
>look</A
> :: <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> <A HREF="Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3A%2B%2B%2B"
>(+++)</A
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3A%3C%2B%2B"
>(&lt;++)</A
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Apfail"
>pfail</A
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Achoice"
>choice</A
> ::  [<A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a] -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AreadPrec_to_P"
>readPrec_to_P</A
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -&gt; <A HREF="Text-ParserCombinators-ReadP.html#t%3AReadP"
>ReadP</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AreadP_to_Prec"
>readP_to_Prec</A
> ::  (<A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -&gt; <A HREF="Text-ParserCombinators-ReadP.html#t%3AReadP"
>ReadP</A
> a) -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AreadPrec_to_S"
>readPrec_to_S</A
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -&gt; <A HREF="Text-ParserCombinators-ReadP.html#t%3AReadS"
>ReadS</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AreadS_to_Prec"
>readS_to_Prec</A
> ::  (<A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -&gt; <A HREF="Text-ParserCombinators-ReadP.html#t%3AReadS"
>ReadS</A
> a) -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Documentation</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A NAME="t:ReadPrec"
><A NAME="t%3AReadPrec"
></A
></A
><B
>ReadPrec</B
> a </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="section4"
><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:ReadPrec')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:ReadPrec" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="Control-Monad.html#t%3AMonad"
>Monad</A
> <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Control-Monad.html#t%3AFunctor"
>Functor</A
> <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Control-Monad.html#t%3AMonadPlus"
>MonadPlus</A
> <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="1"
><A NAME="1"
>Precedences
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>type</SPAN
> <A NAME="t:Prec"
><A NAME="t%3APrec"
></A
></A
><B
>Prec</B
> = <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:minPrec"
><A NAME="v%3AminPrec"
></A
></A
><B
>minPrec</B
> :: <A HREF="Text-ParserCombinators-ReadPrec.html#t%3APrec"
>Prec</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="2"
><A NAME="2"
>Precedence operations
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:lift"
><A NAME="v%3Alift"
></A
></A
><B
>lift</B
> ::  <A HREF="Text-ParserCombinators-ReadP.html#t%3AReadP"
>ReadP</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="doc"
>Lift a precedence-insensitive <TT
><A HREF="Text-ParserCombinators-ReadP.html#t%3AReadP"
>ReadP</A
></TT
> to a <TT
><A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
></TT
>.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:prec"
><A NAME="v%3Aprec"
></A
></A
><B
>prec</B
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3APrec"
>Prec</A
> -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="doc"
><P
><TT
>(prec n p)</TT
> checks whether the precedence context is 
   less than or equal to <TT
>n</TT
>, and
</P
><UL
><LI
> if not, fails
</LI
><LI
> if so, parses <TT
>p</TT
> in context <TT
>n</TT
>.
</LI
></UL
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:step"
><A NAME="v%3Astep"
></A
></A
><B
>step</B
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="doc"
>Increases the precedence context by one.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:reset"
><A NAME="v%3Areset"
></A
></A
><B
>reset</B
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="doc"
>Resets the precedence context to zero.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="3"
><A NAME="3"
>Other operations
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="doc"
>All are based directly on their similarly-named <TT
><A HREF="Text-ParserCombinators-ReadP.html#t%3AReadP"
>ReadP</A
></TT
> counterparts.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:get"
><A NAME="v%3Aget"
></A
></A
><B
>get</B
> :: <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> <A HREF="../ghc-prim/GHC-Types.html#t%3AChar"
>Char</A
></TD
></TR
><TR
><TD CLASS="doc"
>Consumes and returns the next character.
   Fails if there is no input left.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:look"
><A NAME="v%3Alook"
></A
></A
><B
>look</B
> :: <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> <A HREF="Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="doc"
>Look-ahead: returns the part of the input that is left, without
   consuming it.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:+++"
><A NAME="v%3A%2B%2B%2B"
></A
></A
><B
>(+++)</B
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="doc"
>Symmetric choice.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:<++"
><A NAME="v%3A%3C%2B%2B"
></A
></A
><B
>(&lt;++)</B
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="doc"
>Local, exclusive, left-biased choice: If left parser
   locally produces any result at all, then right parser is
   not used.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:pfail"
><A NAME="v%3Apfail"
></A
></A
><B
>pfail</B
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="doc"
>Always fails.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:choice"
><A NAME="v%3Achoice"
></A
></A
><B
>choice</B
> ::  [<A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a] -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="doc"
>Combines all parsers in the specified list.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="4"
><A NAME="4"
>Converters
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:readPrec_to_P"
><A NAME="v%3AreadPrec_to_P"
></A
></A
><B
>readPrec_to_P</B
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -&gt; <A HREF="Text-ParserCombinators-ReadP.html#t%3AReadP"
>ReadP</A
> a</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:readP_to_Prec"
><A NAME="v%3AreadP_to_Prec"
></A
></A
><B
>readP_to_Prec</B
> ::  (<A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -&gt; <A HREF="Text-ParserCombinators-ReadP.html#t%3AReadP"
>ReadP</A
> a) -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:readPrec_to_S"
><A NAME="v%3AreadPrec_to_S"
></A
></A
><B
>readPrec_to_S</B
> ::  <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a -&gt; <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -&gt; <A HREF="Text-ParserCombinators-ReadP.html#t%3AReadS"
>ReadS</A
> a</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:readS_to_Prec"
><A NAME="v%3AreadS_to_Prec"
></A
></A
><B
>readS_to_Prec</B
> ::  (<A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -&gt; <A HREF="Text-ParserCombinators-ReadP.html#t%3AReadS"
>ReadS</A
> a) -&gt; <A HREF="Text-ParserCombinators-ReadPrec.html#t%3AReadPrec"
>ReadPrec</A
> a</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="botbar"
>Produced by <A HREF="http://www.haskell.org/haddock/"
>Haddock</A
> version 2.4.2</TD
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