X-Git-Url: https://jasonwoof.com/gitweb/?a=blobdiff_plain;f=template.php;h=bbee573a28226abdc7dd438b3a1dfa17d7596f72;hb=3faf64c6a1e0cbd4f880da951775c41fb8a6f0ab;hp=0e1688c8fdde46e16d9a9de80dc148fa7794f1de;hpb=ea7f4763f4ee51f22091aa6e75cd4c59cea55bc0;p=wfpl.git
diff --git a/template.php b/template.php
index 0e1688c..bbee573 100644
--- a/template.php
+++ b/template.php
@@ -42,8 +42,8 @@ require_once('code/wfpl/file.php');
require_once('code/wfpl/misc.php');
-# Public functions
-# ----------------
+# Top-Level Functions
+# -------------------
function template($template, $data) {
return fill_template(parse_template($template), $data);
@@ -57,37 +57,37 @@ function parse_template_file($filename) {
return parse_template(file_get_contents($filename));
}
-# First we take the template string and convert it into a tree of
-# strings and sub-templates. A template is a hash with a name string,
-# a pieces array, and possibly an args array.
+# We parse the template string into a tree of strings and sub-templates.
+# A template is a hash with a name string, a pieces array, and possibly
+# an args array.
function parse_template($string) {
- # Don't mess with the $stack/$tem assignments! Since
- # PHP references point to the variable, not the data,
- # it really does have to be written exactly like this.
- $stack[] = array('name' => 'root', 'pieces' => array());
- $tem = &last($stack);
+ $tem =& tem_push();
+ $tem['pieces'] = array();
# note: for some reason this captures ''.
$matches = preg_split("/()/", $string, -1, PREG_SPLIT_DELIM_CAPTURE);
foreach($matches as $match) {
- if(substr($match,0,1) == '~') {
+ if($match == '~~') $match = '~';
+ if(substr($match,0,1) == '~' and strlen($match) > 2) {
$args = explode(' ', substr($match,1,-1));
if(count($args) == 1 and $args[0] == '}') $name = '';
else $name = array_shift($args);
if(last($args) == '{') { # open block
- array_pop($args);
- $stack[] = array('name' => $name, 'pieces' => array(), 'args' => $args);
- $tem['pieces'][] = &last($stack);
- $tem = &last($stack);
+ array_pop($args); # drop '{'
+ $tem =& tem_push($tem); # create a new sub-template
+ $tem['parent']['pieces'][] =& $tem; # as a piece of the parent
+ $tem['name'] = $name;
+ $tem['pieces'] = array();
+ $tem['args'] = $args;
} elseif(last($args) == '}') { # close block
- array_pop($args);
- $cur = $stack[count($stack)-1]['name'];
+ array_pop($args); # drop '}'
+ $cur = $tem['name'];
if($name && $name != $cur) {
die("Invalid template: tried to close '$name', but '$cur' is current.");
}
- array_pop($stack); $tem = &last($stack);
+ $tem =& $tem['parent'];
} else { # value slot
$tem['pieces'][] = array('name' => $name, 'args' => $args);
}
@@ -98,6 +98,54 @@ function parse_template($string) {
return $tem;
}
+function fill_template($template, &$data, &$context = NULL) {
+ $context =& tem_push($context);
+ $context['data'] =& $data;
+
+ foreach($template['pieces'] as $tem) {
+ if(is_string($tem)) $output .= $tem;
+ elseif($tem['pieces']) { # sub-template
+ $rows =& tem_row_data($tem, $context);
+ $context['rows'] =& $rows;
+ foreach($rows as $key => &$row) {
+ $context['cur'] = $key;
+ $output .= fill_template($tem, $row, $context);
+ }
+ } else { # variable
+ $output .= tem_encoded_data($tem, $context);
+ }
+ }
+ $context =& $context['parent'];
+ return $output;
+}
+
+
+# Implementation
+# --------------
+
+
+# To track our position in the template and in the data, we use a linked
+# stack structure. Each node is a hash with a reference to the parent
+# node along with whatever other data you want to add. For each stack,
+# you simply keep a variable with a reference to the top element. Then
+# the push and pop operations are:
+
+# $top =& tem_push($top);
+# $top =& $top['parent'];
+
+function &tem_push(&$stack = NULL) {
+ static $refs = array();
+
+ # Since a PHP reference is *not* a pointer to data, but a pointer to
+ # a variable (or array slot), we *have* to first put the new node in
+ # $refs, and then reference it from $new.
+
+ $refs[] = array();
+ $new =& $refs[count($refs)-1];
+ if($stack) $new['parent'] =& $stack;
+ return $new;
+}
+
# To fill out a template, we do a depth-first traversal of the template
# tree, replacing all tags with the data values.
@@ -125,33 +173,12 @@ function tem_data_as_rows($value) {
}
}
-
-
-# We use dynamic scoping, so we keep a stack of namespaces.
-# Each scope references a hash and the parent scope.
-
-function &tem_scope(&$data, $push = true) {
- static $stack = array();
-
- if($push) {
- $parent =& last($stack);
- $stack[] = array();
-
- $scope =& last($stack);
- $scope['data'] =& $data;
- if($parent) $scope['parent'] =& $parent;
- } else { # pop
- array_pop($stack);
- }
- return last($stack);
-}
-
-function &tem_end_scope() { return tem_scope($x, false); }
-
# To look up a key, we check each namespace (starting with the
# innermost one) until a value is found.
-function tem_find_scope($key, $context) {
+function tem_data_scope($key, $context) {
+ static $refs = array();
+
$scope = $context;
do{
if(array_key_exists($key, $scope['data'])) {
@@ -160,27 +187,31 @@ function tem_find_scope($key, $context) {
} while($scope = $scope['parent']);
# not found; return empty scope.
- return array('parent' => $context);
+ $refs[] = array();
+ $ret = array();
+ $ret['parent'] =& $context;
+ $ret['data'] =& last($refs);
+ return $ret;
}
-function tem_get($key, $context) {
- $scope = tem_find_scope($key, $context);
+function tem_get_data($key, $context) {
+ $scope = tem_data_scope($key, $context);
if($scope) return $scope['data'][$key];
}
# Return the value for a tag as a set of rows to fill a sub-template.
# If $tag has an arg, call the tem_auto function to munge the data.
-function &tem_get_rows($tag, $context)
+function &tem_row_data($tem, $context)
{
- $key = $tag['name'];
- if(count($tag['args'])) {
- $func = "tem_auto_" . $tag['args'][0];
- function_exists($func)
- or die("ERROR: template auto function '$func' not found.
\n");
- }
- $scope = tem_find_scope($key, $context);
+ $key = $tem['name'];
+ $scope = tem_data_scope($key, $context);
- if($func) $value = $func($key, $scope);
+ if(count($tem['args'])) {
+ $auto_func = "tem_auto_" . $tem['args'][0];
+ function_exists($auto_func)
+ or die("ERROR: template auto function '$auto_func' not found.
\n");
+ }
+ if($auto_func) $value = $auto_func($scope['data'][$key], $key, $scope);
else $value = $scope['data'][$key];
$rows = tem_data_as_rows($value);
@@ -190,10 +221,10 @@ function &tem_get_rows($tag, $context)
}
# Return the value for a tag as an encoded string.
-function tem_get_enc($tag, $context)
+function tem_encoded_data($tag, $context)
{
$key = $tag['name'];
- $value = tem_get($key, $context);
+ $value = tem_get_data($key, $context);
foreach($tag['args'] as $encoding) {
$func = "enc_$encoding";
if(function_exists($func)) $value = $func($value, $key);
@@ -202,26 +233,6 @@ function tem_get_enc($tag, $context)
return $value;
}
-function fill_template($template, &$data, &$context = NULL) {
- if(!$context) $context =& tem_scope($data);
- foreach($template['pieces'] as $tem) {
- if(is_string($tem)) $output .= $tem;
- elseif($tem['pieces']) { # sub-template
- $rows =& tem_get_rows($tem, $context);
- foreach($rows as $key => &$row) {
- $context =& tem_scope($row);
- $context['rows'] =& $rows;
- $output .= fill_template($tem, $row, $context);
- $context =& tem_end_scope();
-
- }
- } else { # variable
- $output .= tem_get_enc($tem, $context);
- }
- }
- return $output;
-}
-
# Return a hash containing the top-level sub-templates of tem.
@@ -260,39 +271,223 @@ function merge_templates($main, $tem) {
# 'sep' (separator) sections will be shown for all but the last parent row.
# Sample usage:
-#
-#
+#
+#
# row content...
-#