reads

equivalent to readsPrec with a precedence of 0.

A parser for a type a, represented as a function that takes a String and returns a list of possible parses as (a,String) pairs. Note that this kind of backtracking parser is very inefficient; reading a large structure may be quite slow (cf ReadP).

attempts to parse a value from the front of the string, returning a list of (parsed value, remaining string) pairs. If there is no successful parse, the returned list is empty. Derived instances of Read and Show satisfy the following:

• (x,"") is an element of (readsPrec d (showsPrec d x "")).

That is, readsPrec parses the string produced by showsPrec, and delivers the value that showsPrec started with.

Deprecated: Use readsBinaryWith to define liftReadsPrec

readsBinaryWith rp1 rp2 n c n' matches the name of a binary data constructor and then parses its arguments using rp1 and rp2 respectively.

readsData p d is a parser for datatypes where each alternative begins with a data constructor. It parses the constructor and passes it to p. Parsers for various constructors can be constructed with readsUnary, readsUnary1 and readsBinary1, and combined with mappend from the Monoid class.

Lift the standard readsPrec and readList functions through the type constructor.

Lift the standard readsPrec function through the type constructor.

Deprecated: Use readsUnaryWith to define liftReadsPrec

Deprecated: Use readsUnaryWith to define liftReadsPrec

readsUnaryWith rp n c n' matches the name of a unary data constructor and then parses its argument using rp.

Read the value of an STRef

Reads a signed Real value, given a reader for an unsigned value.

Converts a Haskell ReadS-style function into a parser. Warning: This introduces local backtracking in the resulting parser, and therefore a possible inefficiency.

Read a StablePtr# value from mutable array; offset in machine words. Warning: this can fail with an unchecked exception.

Read a StablePtr# value from mutable address; offset in machine words. On some platforms, the access may fail for an insufficiently aligned Addr#. Warning: this can fail with an unchecked exception.

Read parser for a symbol record field, of the form (###)=value (where ### is the field name). The field name must be a symbol (operator-style), e.g. (#). For regular (alphanumeric) field names, use readField. The second argument is a parser for the field value.