| hxt-8.5.4: A collection of tools for processing XML with Haskell. | Source code | Contents | Index

Text.XML.HXT.Arrow.XmlArrow

Portability | portable
Stability | experimental
Maintainer | Uwe Schmidt (uwe@fh-wedel.de)

Description
Basic arrows for processing XML documents All arrows use IO and a global state for options, errorhandling, ...
Synopsis

class (Arrow a, ArrowList a, ArrowTree a) => ArrowXml a where

isText :: a XmlTree XmlTree
isCharRef :: a XmlTree XmlTree
isEntityRef :: a XmlTree XmlTree
isCmt :: a XmlTree XmlTree
isCdata :: a XmlTree XmlTree
isPi :: a XmlTree XmlTree
isXmlPi :: a XmlTree XmlTree
isElem :: a XmlTree XmlTree
isDTD :: a XmlTree XmlTree
isAttr :: a XmlTree XmlTree
isError :: a XmlTree XmlTree
isRoot :: a XmlTree XmlTree
hasText :: (String -> Bool) -> a XmlTree XmlTree
isWhiteSpace :: a XmlTree XmlTree
hasNameWith :: (QName -> Bool) -> a XmlTree XmlTree
hasQName :: QName -> a XmlTree XmlTree
hasName :: String -> a XmlTree XmlTree
hasLocalPart :: String -> a XmlTree XmlTree
hasNamePrefix :: String -> a XmlTree XmlTree
hasNamespaceUri :: String -> a XmlTree XmlTree
hasAttr :: String -> a XmlTree XmlTree
hasQAttr :: QName -> a XmlTree XmlTree
hasAttrValue :: String -> (String -> Bool) -> a XmlTree XmlTree
hasQAttrValue :: QName -> (String -> Bool) -> a XmlTree XmlTree
mkText :: a String XmlTree
mkCharRef :: a Int XmlTree
mkEntityRef :: a String XmlTree
mkCmt :: a String XmlTree
mkCdata :: a String XmlTree
mkError :: Int -> a String XmlTree
mkElement :: QName -> a n XmlTree -> a n XmlTree -> a n XmlTree
mkAttr :: QName -> a n XmlTree -> a n XmlTree
mkPi :: QName -> a n XmlTree -> a n XmlTree
mkqelem :: QName -> [a n XmlTree] -> [a n XmlTree] -> a n XmlTree
mkelem :: String -> [a n XmlTree] -> [a n XmlTree] -> a n XmlTree
aelem :: String -> [a n XmlTree] -> a n XmlTree
selem :: String -> [a n XmlTree] -> a n XmlTree
eelem :: String -> a n XmlTree
root :: [a n XmlTree] -> [a n XmlTree] -> a n XmlTree
qattr :: QName -> a n XmlTree -> a n XmlTree
attr :: String -> a n XmlTree -> a n XmlTree
txt :: String -> a n XmlTree
charRef :: Int -> a n XmlTree
entityRef :: String -> a n XmlTree
cmt :: String -> a n XmlTree
warn :: String -> a n XmlTree
err :: String -> a n XmlTree
fatal :: String -> a n XmlTree
spi :: String -> String -> a n XmlTree
sqattr :: QName -> String -> a n XmlTree
sattr :: String -> String -> a n XmlTree
getText :: a XmlTree String
getCharRef :: a XmlTree Int
getEntityRef :: a XmlTree String
getCmt :: a XmlTree String
getCdata :: a XmlTree String
getPiName :: a XmlTree QName
getPiContent :: a XmlTree XmlTree
getElemName :: a XmlTree QName
getAttrl :: a XmlTree XmlTree
getDTDPart :: a XmlTree DTDElem
getDTDAttrl :: a XmlTree Attributes
getAttrName :: a XmlTree QName
getErrorLevel :: a XmlTree Int
getErrorMsg :: a XmlTree String
getQName :: a XmlTree QName
getName :: a XmlTree String
getUniversalName :: a XmlTree String
getUniversalUri :: a XmlTree String
getLocalPart :: a XmlTree String
getNamePrefix :: a XmlTree String
getNamespaceUri :: a XmlTree String
getAttrValue :: String -> a XmlTree String
getAttrValue0 :: String -> a XmlTree String
getQAttrValue :: QName -> a XmlTree String
getQAttrValue0 :: QName -> a XmlTree String
changeText :: (String -> String) -> a XmlTree XmlTree
changeCmt :: (String -> String) -> a XmlTree XmlTree
changeQName :: (QName -> QName) -> a XmlTree XmlTree
changeElemName :: (QName -> QName) -> a XmlTree XmlTree
changeAttrName :: (QName -> QName) -> a XmlTree XmlTree
changePiName :: (QName -> QName) -> a XmlTree XmlTree
changeAttrValue :: (String -> String) -> a XmlTree XmlTree
changeAttrl :: (XmlTrees -> XmlTrees -> XmlTrees) -> a XmlTree XmlTree -> a XmlTree XmlTree
setQName :: QName -> a XmlTree XmlTree
setElemName :: QName -> a XmlTree XmlTree
setAttrName :: QName -> a XmlTree XmlTree
setPiName :: QName -> a XmlTree XmlTree
setAttrl :: a XmlTree XmlTree -> a XmlTree XmlTree
addAttrl :: a XmlTree XmlTree -> a XmlTree XmlTree
addAttr :: String -> String -> a XmlTree XmlTree
removeAttr :: String -> a XmlTree XmlTree
removeQAttr :: QName -> a XmlTree XmlTree
processAttrl :: a XmlTree XmlTree -> a XmlTree XmlTree
processTopDownWithAttrl :: a XmlTree XmlTree -> a XmlTree XmlTree
(+=) :: a b XmlTree -> a b XmlTree -> a b XmlTree
xshow :: a n XmlTree -> a n String

class ArrowXml a => ArrowDTD a where

isDTDDoctype :: a XmlTree XmlTree
isDTDElement :: a XmlTree XmlTree
isDTDContent :: a XmlTree XmlTree
isDTDAttlist :: a XmlTree XmlTree
isDTDEntity :: a XmlTree XmlTree
isDTDPEntity :: a XmlTree XmlTree
isDTDNotation :: a XmlTree XmlTree
isDTDCondSect :: a XmlTree XmlTree
isDTDName :: a XmlTree XmlTree
isDTDPERef :: a XmlTree XmlTree
hasDTDAttr :: String -> a XmlTree XmlTree
getDTDAttrValue :: String -> a XmlTree String
setDTDAttrValue :: String -> String -> a XmlTree XmlTree
mkDTDElem :: DTDElem -> Attributes -> a n XmlTree -> a n XmlTree
mkDTDDoctype :: Attributes -> a n XmlTree -> a n XmlTree
mkDTDElement :: Attributes -> a n XmlTree
mkDTDEntity :: Attributes -> a n XmlTree
mkDTDPEntity :: Attributes -> a n XmlTree

Documentation

class (Arrow a, ArrowList a, ArrowTree a) => ArrowXml a where | Source

Arrows for processing Text.XML.HXT.DOM.TypeDefs.XmlTrees

These arrows can be grouped into predicates, selectors, constructors, and transformers.

All predicates (tests) act like Control.Arrow.ArrowIf.none for failure and Control.Arrow.ArrowIf.this for success. A logical and can be formed by `a1 >>> a2` , a locical or by `a1 <+> a2` .

Selector arrows will fail, when applied to wrong input, e.g. selecting the text of a node with `getText` will fail when applied to a none text node.

Edit arrows will remain the input unchanged, when applied to wrong argument, e.g. editing the content of a text node with `changeText` applied to an element node will return the unchanged element node.

Methods

isText :: a XmlTree XmlTree | Source

test for text nodes

isCharRef :: a XmlTree XmlTree | Source

test for char reference, used during parsing

isEntityRef :: a XmlTree XmlTree | Source

test for entity reference, used during parsing

isCmt :: a XmlTree XmlTree | Source

test for comment

isCdata :: a XmlTree XmlTree | Source

test for CDATA section, used during parsing

isPi :: a XmlTree XmlTree | Source

test for processing instruction

isXmlPi :: a XmlTree XmlTree | Source

test for processing instruction <?xml ...>

isElem :: a XmlTree XmlTree | Source

test for element

isDTD :: a XmlTree XmlTree | Source

test for DTD part, used during parsing

isAttr :: a XmlTree XmlTree | Source

test for attribute tree

isError :: a XmlTree XmlTree | Source

test for error message

isRoot :: a XmlTree XmlTree | Source

test for root node (element with name "/")

hasText :: (String -> Bool) -> a XmlTree XmlTree | Source

test for text nodes with text, for which a predicate holds example: `hasText (all (`elem` " \t\n"))` check for text nodes with only whitespace content

isWhiteSpace :: a XmlTree XmlTree | Source

test for text nodes with only white space implemented with hasTest

hasNameWith :: (QName -> Bool) -> a XmlTree XmlTree | Source

test whether a node (element, attribute, pi) has a name with a special property

hasQName :: QName -> a XmlTree XmlTree | Source

test whether a node (element, attribute, pi) has a specific qualified name useful only after namespace propagation

hasName :: String -> a XmlTree XmlTree | Source

test whether a node has a specific name (prefix:localPart ore localPart), generally useful, even without namespace handling

hasLocalPart :: String -> a XmlTree XmlTree | Source

test whether a node has a specific name as local part, useful only after namespace propagation

hasNamePrefix :: String -> a XmlTree XmlTree | Source

test whether a node has a specific name prefix, useful only after namespace propagation

hasNamespaceUri :: String -> a XmlTree XmlTree | Source

test whether a node has a specific namespace URI useful only after namespace propagation

hasAttr :: String -> a XmlTree XmlTree | Source

test whether an element node has an attribute node with a specific name

hasQAttr :: QName -> a XmlTree XmlTree | Source

test whether an element node has an attribute node with a specific qualified name

hasAttrValue :: String -> (String -> Bool) -> a XmlTree XmlTree | Source

test whether an element node has an attribute with a specific value

hasQAttrValue :: QName -> (String -> Bool) -> a XmlTree XmlTree | Source

test whether an element node has an attribute with a qualified name and a specific value

mkText :: a String XmlTree | Source

text node construction arrow

mkCharRef :: a Int XmlTree | Source

char reference construction arrow, useful for document output

mkEntityRef :: a String XmlTree | Source

entity reference construction arrow, useful for document output

mkCmt :: a String XmlTree | Source

comment node construction, useful for document output

mkCdata :: a String XmlTree | Source

CDATA construction, useful for document output

mkError :: Int -> a String XmlTree | Source

error node construction, useful only internally

mkElement :: QName -> a n XmlTree -> a n XmlTree -> a n XmlTree | Source

element construction: | the attributes and the content of the element are computed by applying arrows to the input

mkAttr :: QName -> a n XmlTree -> a n XmlTree | Source

attribute node construction: | the attribute value is computed by applying an arrow to the input

mkPi :: QName -> a n XmlTree -> a n XmlTree | Source

processing instruction construction: | the content of the processing instruction is computed by applying an arrow to the input

mkqelem :: QName -> [a n XmlTree] -> [a n XmlTree] -> a n XmlTree | Source

convenient arrow for element construction, more comfortable variant of `mkElement`

example for simplifying `mkElement` :

     mkElement qn (a1 <+> ... <+> ai) (c1 <+> ... <+> cj)

equals

     mkqelem qn [a1,...,ai] [c1,...,cj]

mkelem :: String -> [a n XmlTree] -> [a n XmlTree] -> a n XmlTree | Source

convenient arrow for element construction with strings instead of qualified names as element names, see also `mkElement` and `mkelem`

aelem :: String -> [a n XmlTree] -> a n XmlTree | Source

convenient arrow for element constrution with attributes but without content, simple variant of `mkelem` and `mkElement`

selem :: String -> [a n XmlTree] -> a n XmlTree | Source

convenient arrow for simple element constrution without attributes, simple variant of `mkelem` and `mkElement`

eelem :: String -> a n XmlTree | Source

convenient arrow for constrution of empty elements without attributes, simple variant of `mkelem` and `mkElement`

root :: [a n XmlTree] -> [a n XmlTree] -> a n XmlTree | Source

construction of an element node with name "/" for document roots

qattr :: QName -> a n XmlTree -> a n XmlTree | Source

alias for `mkAttr`

attr :: String -> a n XmlTree -> a n XmlTree | Source

convenient arrow for attribute constrution, simple variant of `mkAttr`

txt :: String -> a n XmlTree | Source

constant arrow for text nodes

charRef :: Int -> a n XmlTree | Source

constant arrow for char reference nodes

entityRef :: String -> a n XmlTree | Source

constant arrow for entity reference nodes

cmt :: String -> a n XmlTree | Source

constant arrow for comment

warn :: String -> a n XmlTree | Source

constant arrow for warning

err :: String -> a n XmlTree | Source

constant arrow for errors

fatal :: String -> a n XmlTree | Source

constant arrow for fatal errors

spi :: String -> String -> a n XmlTree | Source

constant arrow for simple processing instructions, see `mkPi`

sqattr :: QName -> String -> a n XmlTree | Source

constant arrow for attribute nodes, attribute name is a qualified name and value is a text, | see also `mkAttr`, `qattr`, `attr`

sattr :: String -> String -> a n XmlTree | Source

constant arrow for attribute nodes, attribute name and value are | given by parameters, see `mkAttr`

getText :: a XmlTree String | Source

select the text of a text node

getCharRef :: a XmlTree Int | Source

select the value of a char reference

getEntityRef :: a XmlTree String | Source

select the name of a entity reference node

getCmt :: a XmlTree String | Source

select the comment of a comment node

getCdata :: a XmlTree String | Source

select the content of a CDATA node

getPiName :: a XmlTree QName | Source

select the name of a processing instruction

getPiContent :: a XmlTree XmlTree | Source

select the content of a processing instruction

getElemName :: a XmlTree QName | Source

select the name of an element node

getAttrl :: a XmlTree XmlTree | Source

select the attribute list of an element node

getDTDPart :: a XmlTree DTDElem | Source

select the DTD type of a DTD node

getDTDAttrl :: a XmlTree Attributes | Source

select the DTD attributes of a DTD node

getAttrName :: a XmlTree QName | Source

select the name of an attribute

getErrorLevel :: a XmlTree Int | Source

select the error level (c_warn, c_err, c_fatal) from an error node

getErrorMsg :: a XmlTree String | Source

select the error message from an error node

getQName :: a XmlTree QName | Source

select the qualified name from an element, attribute or pi

getName :: a XmlTree String | Source

select the prefix:localPart or localPart from an element, attribute or pi

getUniversalName :: a XmlTree String | Source

select the univeral name ({namespace URI} ++ localPart)

getUniversalUri :: a XmlTree String | Source

select the univeral name (namespace URI ++ localPart)

getLocalPart :: a XmlTree String | Source

select the local part

getNamePrefix :: a XmlTree String | Source

select the name prefix

getNamespaceUri :: a XmlTree String | Source

select the namespace URI

getAttrValue :: String -> a XmlTree String | Source

select the value of an attribute of an element node, always succeeds with empty string as default value ""

getAttrValue0 :: String -> a XmlTree String | Source

like `getAttrValue`, but fails if the attribute does not exist

getQAttrValue :: QName -> a XmlTree String | Source

like `getAttrValue`, but select the value of an attribute given by a qualified name, always succeeds with empty string as default value ""

getQAttrValue0 :: QName -> a XmlTree String | Source

like `getQAttrValue`, but fails if attribute does not exist

changeText :: (String -> String) -> a XmlTree XmlTree | Source

edit the string of a text node

changeCmt :: (String -> String) -> a XmlTree XmlTree | Source

edit the comment string of a comment node

changeQName :: (QName -> QName) -> a XmlTree XmlTree | Source

edit an element-, attribute- or pi- name

changeElemName :: (QName -> QName) -> a XmlTree XmlTree | Source

edit an element name

changeAttrName :: (QName -> QName) -> a XmlTree XmlTree | Source

edit an attribute name

changePiName :: (QName -> QName) -> a XmlTree XmlTree | Source

edit a pi name

changeAttrValue :: (String -> String) -> a XmlTree XmlTree | Source

edit an attribute value

changeAttrl :: (XmlTrees -> XmlTrees -> XmlTrees) -> a XmlTree XmlTree -> a XmlTree XmlTree | Source

edit an attribute list of an element node

setQName :: QName -> a XmlTree XmlTree | Source

replace an element, attribute or pi name

setElemName :: QName -> a XmlTree XmlTree | Source

replace an element name

setAttrName :: QName -> a XmlTree XmlTree | Source

replace an attribute name

setPiName :: QName -> a XmlTree XmlTree | Source

replace an element name

setAttrl :: a XmlTree XmlTree -> a XmlTree XmlTree | Source

replace an atribute list of an element node

addAttrl :: a XmlTree XmlTree -> a XmlTree XmlTree | Source

add a list of attributes to an element

addAttr :: String -> String -> a XmlTree XmlTree | Source

add (or replace) an attribute

removeAttr :: String -> a XmlTree XmlTree | Source

remove an attribute

removeQAttr :: QName -> a XmlTree XmlTree | Source

remove an attribute with a qualified name

processAttrl :: a XmlTree XmlTree -> a XmlTree XmlTree | Source

process the attributes of an element node with an arrow

processTopDownWithAttrl :: a XmlTree XmlTree -> a XmlTree XmlTree | Source

process a whole tree inclusive attribute list of element nodes see also: `processTopDown`

(+=) :: a b XmlTree -> a b XmlTree -> a b XmlTree | Source

convenient op for adding attributes or children to a node

usage: `tf += cf`

the `tf` arrow computes an element node, and all trees computed by `cf` are added to this node, if a tree is an attribute, it is inserted in the attribute list else it is appended to the content list.

attention: do not build long content list this way because `+=` is implemented by ++

examples:

     eelem "a"
       += sattr "href" "page.html"
       += sattr "name" "here"
       += txt "look here"

is the same as

     mkelem [ sattr "href" "page.html"
            , sattr "name" "here"
            ]
            [ txt "look here" ]

and results in the XML fragment: <a href="page.html" name="here">look here</a>

advantage of the `+=` operator is, that attributes and content can be added any time step by step. if `tf` computes a whole list of trees, e.g. a list of "td" or "tr" elements, the attributes or content is added to all trees. useful for adding "class" or "style" attributes to table elements.

xshow :: a n XmlTree -> a n String | Source

apply an arrow to the input and convert the resulting XML trees into a string representation

Instances

ArrowXml LA
ArrowXml IOLA
ArrowXml (SLA s)
ArrowXml (IOSLA s)

class ArrowXml a => ArrowDTD a where | Source

Document Type Definition arrows These are separated, because they are not needed for document processing, only when processing the DTD, e.g. for generating access funtions for the toolbox from a DTD (se example DTDtoHaskell in the examples directory)
Methods

isDTDDoctype :: a XmlTree XmlTree | Source

isDTDElement :: a XmlTree XmlTree | Source

isDTDContent :: a XmlTree XmlTree | Source

isDTDAttlist :: a XmlTree XmlTree | Source

isDTDEntity :: a XmlTree XmlTree | Source

isDTDPEntity :: a XmlTree XmlTree | Source

isDTDNotation :: a XmlTree XmlTree | Source

isDTDCondSect :: a XmlTree XmlTree | Source

isDTDName :: a XmlTree XmlTree | Source

isDTDPERef :: a XmlTree XmlTree | Source

hasDTDAttr :: String -> a XmlTree XmlTree | Source

getDTDAttrValue :: String -> a XmlTree String | Source

setDTDAttrValue :: String -> String -> a XmlTree XmlTree | Source

mkDTDElem :: DTDElem -> Attributes -> a n XmlTree -> a n XmlTree | Source

mkDTDDoctype :: Attributes -> a n XmlTree -> a n XmlTree | Source

mkDTDElement :: Attributes -> a n XmlTree | Source

mkDTDEntity :: Attributes -> a n XmlTree | Source

mkDTDPEntity :: Attributes -> a n XmlTree | Source

Instances

ArrowDTD LA
ArrowDTD IOLA
ArrowDTD (SLA s)
ArrowDTD (IOSLA s)

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