private function compilePattern(int $line, array $tokens) : Parser
{
if (!$tokens) {
$this->fail(self::E_EMPTY_PATTERN, $line);
}
$ts = TokenStream::fromSlice($tokens);
traverse(either(consume(chain(token(T_NS_SEPARATOR), token(T_NS_SEPARATOR), parentheses()->as('cloaked')))->onCommit(function (Ast $result) use($ts) {
$ts->inject(TokenStream::fromSequence(...$result->cloaked));
$ts->skip(...TokenStream::SKIPPABLE);
}), rtoken('/^(T_\\w+)·(\\w+)$/')->onCommit(function (Ast $result) {
$token = $result->token();
$id = $this->lookupCapture($token);
$type = $this->lookupTokenType($token);
$this->parsers[] = token($type)->as($id);
}), ($parser = chain(rtoken('/^·\\w+$/')->as('parser_type'), token('('), optional(ls(either(future($parser)->as('parser'), string()->as('string'), rtoken('/^T_\\w+·\\w+$/')->as('token'), rtoken('/^T_\\w+$/')->as('constant'), word()->as('word')), token(',')))->as('args'), commit(token(')')), optional(rtoken('/^·\\w+$/')->as('label'))))->onCommit(function (Ast $result) {
$this->parsers[] = $this->compileParser($result->array());
}), $this->layer('{', '}', braces()), $this->layer('[', ']', brackets()), $this->layer('(', ')', parentheses()), rtoken('/^···(\\w+)$/')->onCommit(function (Ast $result) {
$id = $this->lookupCapture($result->token());
$this->parsers[] = layer()->as($id);
}), token(T_STRING, '·')->onCommit(function (Ast $result) use($ts) {
$offset = \count($this->parsers);
if (0 !== $this->dominance || 0 === $offset) {
$this->fail(self::E_BAD_DOMINANCE, $offset, $result->token()->line());
}
$this->dominance = $offset;
}), rtoken('/·/')->onCommit(function (Ast $result) {
$token = $result->token();
$this->fail(self::E_BAD_CAPTURE, $token, $token->line());
}), any()->onCommit(function (Ast $result) {
$this->parsers[] = token($result->token());
})))->parse($ts);
// check if macro dominance '·' is last token
if ($this->dominance === \count($this->parsers)) {
$this->fail(self::E_BAD_DOMINANCE, $this->dominance, $ts->last()->line());
}
$this->specificity = \count($this->parsers);
if ($this->specificity > 1) {
if (0 === $this->dominance) {
$pattern = chain(...$this->parsers);
} else {
/*
dominat macros are partially wrapped in commit()s and dominance
is the offset used as the 'event horizon' point... once the entry
point is matched, there is no way back and a parser error arises
*/
$prefix = array_slice($this->parsers, 0, $this->dominance);
$suffix = array_slice($this->parsers, $this->dominance);
$pattern = chain(...array_merge($prefix, array_map(commit::class, $suffix)));
}
} else {
/*
micro optimization to save one function call for every token on the subject
token stream whenever the macro pattern consists of a single parser
*/
$pattern = $this->parsers[0];
}
return $pattern;
}
<?php
require "../settings.php";
require "gw-common.php";
error_reporting(E_ALL);
if (isset($_REQUEST["key"])) {
switch ($_REQUEST["key"]) {
case "display":
$OUTPUT = display();
break;
case "future":
$OUTPUT = future();
break;
case "remove":
$OUTPUT = remove();
break;
}
} else {
$OUTPUT = display();
}
require "gw-tmpl.php";
function display()
{
extract($_REQUEST);
$fields = array();
$fields["human_date"] = date("D jS M Y");
// eg: Mon 2nd Aug 2006
extract($fields, EXTR_SKIP);
$sql = "SELECT * FROM cubit.today WHERE date<=now()";
$today_rslt = db_exec($sql) or errDie("Unable to retrieve today.");
$today_out = "";
private function compileParserArgs(array $args) : array
{
$compiled = [];
foreach ($args as $label => $arg) {
switch ((string) $label) {
case 'this':
$compiled[] = future($this->pattern);
break;
case 'token':
$type = $this->lookupTokenType($arg);
$label = $this->lookupCapture($arg);
$compiled[] = token($type)->as($label);
break;
case 'label':
$compiled[] = token($arg);
break;
case 'parser':
$compiled[] = $this->compileParser($arg['type'], $arg['args'], $arg['label']);
break;
case 'string':
$compiled[] = trim((string) $arg, '"\'');
break;
case 'constant':
// T_*
$compiled[] = $this->lookupTokenType($arg);
break;
case 'function':
// function(...){...}
$arglist = implode('', $arg['args']);
$body = implode('', $arg['body']);
$compiled[] = eval("return function({$arglist}){ {$body} };");
break;
default:
$compiled = array_merge($compiled, $this->compileParserArgs($arg));
}
}
return $compiled;
}
