includes/parser/Preprocessor.php

   1 <?php
   2 /**
   3  * Interfaces for preprocessors
   4  *
   5  * @file
   6  */
   7
   8 /**
   9  * @ingroup Parser
  10  */
  11 interface Preprocessor {
  12         /**
  13          * Create a new preprocessor object based on an initialised Parser object
  14          *
  15          * @param $parser Parser
  16          */
  17         function __construct( $parser );
  18
  19         /**
  20          * Create a new top-level frame for expansion of a page
  21          *
  22          * @return PPFrame
  23          */
  24         function newFrame();
  25
  26         /**
  27          * Create a new custom frame for programmatic use of parameter replacement as used in some extensions
  28          *
  29          * @param $args array
  30          *
  31          * @return PPFrame
  32          */
  33         function newCustomFrame( $args );
  34
  35         /**
  36          * Create a new custom node for programmatic use of parameter replacement as used in some extensions
  37          *
  38          * @param $values
  39          */
  40         function newPartNodeArray( $values );
  41
  42         /**
  43          * Preprocess text to a PPNode
  44          *
  45          * @param $text
  46          * @param $flags
  47          *
  48          * @return PPNode
  49          */
  50         function preprocessToObj( $text, $flags = 0 );
  51 }
  52
  53 /**
  54  * @ingroup Parser
  55  */
  56 interface PPFrame {
  57         const NO_ARGS = 1;
  58         const NO_TEMPLATES = 2;
  59         const STRIP_COMMENTS = 4;
  60         const NO_IGNORE = 8;
  61         const RECOVER_COMMENTS = 16;
  62
  63         const RECOVER_ORIG = 27; // = 1|2|8|16 no constant expression support in PHP yet
  64
  65         /**
  66          * Create a child frame
  67          *
  68          * @param $args array
  69          * @param $title Title
  70          *
  71          * @return PPFrame
  72          */
  73         function newChild( $args = false, $title = false );
  74
  75         /**
  76          * Expand a document tree node
  77          */
  78         function expand( $root, $flags = 0 );
  79
  80         /**
  81          * Implode with flags for expand()
  82          */
  83         function implodeWithFlags( $sep, $flags /*, ... */ );
  84
  85         /**
  86          * Implode with no flags specified
  87          */
  88         function implode( $sep /*, ... */ );
  89
  90         /**
  91          * Makes an object that, when expand()ed, will be the same as one obtained
  92          * with implode()
  93          */
  94         function virtualImplode( $sep /*, ... */ );
  95
  96         /**
  97          * Virtual implode with brackets
  98          */
  99         function virtualBracketedImplode( $start, $sep, $end /*, ... */ );
 100
 101         /**
 102          * Returns true if there are no arguments in this frame
 103          *
 104          * @return bool
 105          */
 106         function isEmpty();
 107
 108         /**
 109          * Returns all arguments of this frame
 110          */
 111         function getArguments();
 112
 113         /**
 114          * Returns all numbered arguments of this frame
 115          */
 116         function getNumberedArguments();
 117
 118         /**
 119          * Returns all named arguments of this frame
 120          */
 121         function getNamedArguments();
 122
 123         /**
 124          * Get an argument to this frame by name
 125          */
 126         function getArgument( $name );
 127
 128         /**
 129          * Returns true if the infinite loop check is OK, false if a loop is detected
 130          *
 131          * @param $title
 132          *
 133          * @return bool
 134          */
 135         function loopCheck( $title );
 136
 137         /**
 138          * Return true if the frame is a template frame
 139          */
 140         function isTemplate();
 141 }
 142
 143 /**
 144  * There are three types of nodes:
 145  *     * Tree nodes, which have a name and contain other nodes as children
 146  *     * Array nodes, which also contain other nodes but aren't considered part of a tree
 147  *     * Leaf nodes, which contain the actual data
 148  *
 149  * This interface provides access to the tree structure and to the contents of array nodes,
 150  * but it does not provide access to the internal structure of leaf nodes. Access to leaf
 151  * data is provided via two means:
 152  *     * PPFrame::expand(), which provides expanded text
 153  *     * The PPNode::split*() functions, which provide metadata about certain types of tree node
 154  * @ingroup Parser
 155  */
 156 interface PPNode {
 157         /**
 158          * Get an array-type node containing the children of this node.
 159          * Returns false if this is not a tree node.
 160          */
 161         function getChildren();
 162
 163         /**
 164          * Get the first child of a tree node. False if there isn't one.
 165          *
 166          * @return PPNode
 167          */
 168         function getFirstChild();
 169
 170         /**
 171          * Get the next sibling of any node. False if there isn't one
 172          */
 173         function getNextSibling();
 174
 175         /**
 176          * Get all children of this tree node which have a given name.
 177          * Returns an array-type node, or false if this is not a tree node.
 178          */
 179         function getChildrenOfType( $type );
 180
 181
 182         /**
 183          * Returns the length of the array, or false if this is not an array-type node
 184          */
 185         function getLength();
 186
 187         /**
 188          * Returns an item of an array-type node
 189          */
 190         function item( $i );
 191
 192         /**
 193          * Get the name of this node. The following names are defined here:
 194          *
 195          *    h             A heading node.
 196          *    template      A double-brace node.
 197          *    tplarg        A triple-brace node.
 198          *    title         The first argument to a template or tplarg node.
 199          *    part          Subsequent arguments to a template or tplarg node.
 200          *    #nodelist     An array-type node
 201          *
 202          * The subclass may define various other names for tree and leaf nodes.
 203          */
 204         function getName();
 205
 206         /**
 207          * Split a <part> node into an associative array containing:
 208          *    name          PPNode name
 209          *    index         String index
 210          *    value         PPNode value
 211          */
 212         function splitArg();
 213
 214         /**
 215          * Split an <ext> node into an associative array containing name, attr, inner and close
 216          * All values in the resulting array are PPNodes. Inner and close are optional.
 217          */
 218         function splitExt();
 219
 220         /**
 221          * Split an <h> node
 222          */
 223         function splitHeading();
 224 }