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Add simple calculator example

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@343059 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Anatol Belski 2017-09-10 20:00:11 +00:00
parent 2babd0e7f4
commit 4df3b4c991
1 changed files with 94 additions and 3 deletions
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97
reference/parle/examples.xml
View file

@ -12,9 +12,7 @@
<![CDATA[
<?php
use Parle\Token;
use Parle\Lexer;
use Parle\LexerException;
use Parle\{Token, Lexer, LexerException};
/* name => id */
$token = array(
@ -80,6 +78,99 @@ do {
</section>
<section xml:id="parle.examples.parser">
<title>Parser examples</title>
<example>
<title>Simple calculator</title>
<programlisting role="php">
<![CDATA[
<?php
use Parle\{Parser, ParserException, Lexer, Token};
$p = new Parser;
$p->token("INTEGER");
$p->left("'+' '-' '*' '/'");
$p->push("start", "exp");
$add_idx = $p->push("exp", "exp '+' exp");
$sub_idx = $p->push("exp", "exp '-' exp");
$mul_idx = $p->push("exp", "exp '*' exp");
$div_idx = $p->push("exp", "exp '/' exp");
$int_idx = $p->push("exp", "INTEGER");
$p->build();
$lex = new Lexer;
$lex->push("[+]", $p->tokenId("'+'"));
$lex->push("[-]", $p->tokenId("'-'"));
$lex->push("[*]", $p->tokenId("'*'"));
$lex->push("[/]", $p->tokenId("'/'"));
$lex->push("\\d+", $p->tokenId("INTEGER"));
$lex->push("\\s+", Token::SKIP);
$lex->build();
$exp = array(
"1 + 1",
"33 / 10",
"100 * 45",
"17 - 45",
);
foreach ($exp as $in) {
if (!$p->validate($in, $lex)) {
throw new ParserException("Failed to validate input");
}
$p->consume($in, $lex);
$act = $p->action();
while (Parser::ACTION_ERROR != $act && Parser::ACTION_ACCEPT != $act) {
switch ($act) {
case Parser::ACTION_ERROR:
throw new ParserException("Parser error");
break;
case Parser::ACTION_SHIFT:
case Parser::ACTION_GOTO:
case Parser::ACTION_ACCEPT:
break;
case Parser::ACTION_REDUCE:
$rid = $p->reduceId();
/*$l = $p->sigil(0);
$r = $p->sigil(2);*/
switch ($rid) {
case $add_idx:
$l = $p->sigil(0);
$r = $p->sigil(2);
echo "$l + $r = " . ($l + $r) . "\n";
break;
case $sub_idx:
$l = $p->sigil(0);
$r = $p->sigil(2);
echo "$l - $r = " . ($l - $r) . "\n";
break;
case $mul_idx:
$l = $p->sigil(0);
$r = $p->sigil(2);
echo "$l * $r = " . ($l * $r) . "\n";
break;
case $div_idx:
$l = $p->sigil(0);
$r = $p->sigil(2);
echo "$l / $r = " . ($l / $r) . "\n";
break;
}
break;
}
$p->advance();
$act = $p->action();
}
}
]]>
</programlisting>
</example>
<example>
<title>Parse words out from a sentense</title>
<programlisting role="php">