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authorBruce Wells <bruce.wells@simparel.com>2018-11-26 17:25:33 +0300
committerBruce Wells <bruce.wells@simparel.com>2018-11-26 18:01:01 +0300
commit5bdc27efdb50434a6f44a01e158d5e13eff3a020 (patch)
tree221aef8b0d2c57e3cd8eb62d6b25e548279fd48b /src
parent72aaf58e5530609b826a3615e3b28135c07a0f9e (diff)
Fixed function in () block issue
Diffstat (limited to 'src')
-rw-r--r--src/NXP/Classes/Lexer.php263
1 files changed, 133 insertions, 130 deletions
diff --git a/src/NXP/Classes/Lexer.php b/src/NXP/Classes/Lexer.php
index 82b2c53..36eb43c 100644
--- a/src/NXP/Classes/Lexer.php
+++ b/src/NXP/Classes/Lexer.php
@@ -1,130 +1,133 @@
-<?php
-/**
- * This file is part of the MathExecutor package
- *
- * (c) Alexander Kiryukhin
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code
- */
-
-namespace NXP\Classes;
-use NXP\Classes\Token\AbstractOperator;
-use NXP\Classes\Token\InterfaceOperator;
-use NXP\Classes\Token\TokenComma;
-use NXP\Classes\Token\TokenFunction;
-use NXP\Classes\Token\TokenLeftBracket;
-use NXP\Classes\Token\TokenNumber;
-use NXP\Classes\Token\TokenRightBracket;
-use NXP\Classes\Token\TokenVariable;
-use NXP\Classes\Token\TokenString;
-use NXP\Exception\IncorrectBracketsException;
-use NXP\Exception\IncorrectExpressionException;
-
-/**
- * @author Alexander Kiryukhin <alexander@symdev.org>
- */
-class Lexer
-{
- /**
- * @var TokenFactory
- */
- private $tokenFactory;
-
- public function __construct($tokenFactory)
- {
- $this->tokenFactory = $tokenFactory;
- }
-
- /**
- * @param string $input Source string of equation
- * @return array Tokens stream
- * @throws \NXP\Exception\IncorrectExpressionException
- */
- public function stringToTokensStream($input)
- {
- $matches = [];
- preg_match_all($this->tokenFactory->getTokenParserRegex(), $input, $matches);
- $tokenFactory = $this->tokenFactory;
- $tokensStream = array_map(
- function ($token) use ($tokenFactory) {
- return $tokenFactory->createToken($token);
- },
- $matches[0]
- );
-
- return $tokensStream;
- }
-
- /**
- * @param array $tokensStream Tokens stream
- * @return array Array of tokens in revers polish notation
- * @throws \NXP\Exception\IncorrectExpressionException
- */
- public function buildReversePolishNotation($tokensStream)
- {
- $output = [];
- $stack = [];
-
- foreach ($tokensStream as $token) {
- if ($token instanceof TokenString) {
- $output[] = $token;
- }
- if ($token instanceof TokenNumber) {
- $output[] = $token;
- }
- if ($token instanceof TokenVariable) {
- $output[] = $token;
- }
- if ($token instanceof TokenFunction) {
- array_push($stack, $token);
- }
- if ($token instanceof TokenLeftBracket) {
- array_push($stack, $token);
- }
- if ($token instanceof TokenComma) {
- while (($current = array_pop($stack)) && (!$current instanceof TokenLeftBracket)) {
- $output[] = $current;
- if (empty($stack)) {
- throw new IncorrectExpressionException();
- }
- }
- }
- if ($token instanceof TokenRightBracket) {
- while (($current = array_pop($stack)) && (!$current instanceof TokenLeftBracket)) {
- $output[] = $current;
- }
- if (!empty($stack) && ($stack[count($stack)-1] instanceof TokenFunction)) {
- $output[] = array_pop($stack);
- }
- }
-
- if ($token instanceof AbstractOperator) {
- while (
- count($stack) > 0 &&
- ($stack[count($stack)-1] instanceof InterfaceOperator) &&
- ((
- $token->getAssociation() == AbstractOperator::LEFT_ASSOC &&
- $token->getPriority() <= $stack[count($stack)-1]->getPriority()
- ) || (
- $token->getAssociation() == AbstractOperator::RIGHT_ASSOC &&
- $token->getPriority() < $stack[count($stack)-1]->getPriority()
- ))
- ) {
- $output[] = array_pop($stack);
- }
-
- array_push($stack, $token);
- }
- }
- while (!empty($stack)) {
- $token = array_pop($stack);
- if ($token instanceof TokenLeftBracket || $token instanceof TokenRightBracket) {
- throw new IncorrectBracketsException();
- }
- $output[] = $token;
- }
-
- return $output;
- }
-}
+<?php
+/**
+ * This file is part of the MathExecutor package
+ *
+ * (c) Alexander Kiryukhin
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code
+ */
+
+namespace NXP\Classes;
+
+use NXP\Classes\Token\AbstractOperator;
+use NXP\Classes\Token\InterfaceOperator;
+use NXP\Classes\Token\TokenComma;
+use NXP\Classes\Token\TokenFunction;
+use NXP\Classes\Token\TokenLeftBracket;
+use NXP\Classes\Token\TokenNumber;
+use NXP\Classes\Token\TokenRightBracket;
+use NXP\Classes\Token\TokenVariable;
+use NXP\Classes\Token\TokenString;
+use NXP\Exception\IncorrectBracketsException;
+use NXP\Exception\IncorrectExpressionException;
+
+/**
+ * @author Alexander Kiryukhin <alexander@symdev.org>
+ */
+class Lexer
+{
+ /**
+ * @var TokenFactory
+ */
+ private $tokenFactory;
+
+ public function __construct($tokenFactory)
+ {
+ $this->tokenFactory = $tokenFactory;
+ }
+
+ /**
+ * @param string $input Source string of equation
+ * @return array Tokens stream
+ * @throws \NXP\Exception\IncorrectExpressionException
+ */
+ public function stringToTokensStream($input)
+ {
+ $matches = [];
+ preg_match_all($this->tokenFactory->getTokenParserRegex(), $input, $matches);
+ $tokenFactory = $this->tokenFactory;
+ $tokensStream = array_map(
+ function ($token) use ($tokenFactory) {
+ return $tokenFactory->createToken($token);
+ },
+ $matches[0]
+ );
+
+ return $tokensStream;
+ }
+
+ /**
+ * @param array $tokensStream Tokens stream
+ * @return array Array of tokens in revers polish notation
+ * @throws \NXP\Exception\IncorrectExpressionException
+ */
+ public function buildReversePolishNotation($tokensStream)
+ {
+ $output = [];
+ $stack = [];
+
+ foreach ($tokensStream as $token) {
+ if ($token instanceof TokenString) {
+ $output[] = $token;
+ }
+ elseif ($token instanceof TokenNumber) {
+ $output[] = $token;
+ }
+ elseif ($token instanceof TokenVariable) {
+ $output[] = $token;
+ }
+ elseif ($token instanceof TokenFunction) {
+ array_push($stack, $token);
+ }
+ elseif ($token instanceof AbstractOperator) {
+ // While we have something on the stack
+ while (($count = count($stack)) > 0
+ && (
+ // If it is a function
+ ($stack[$count-1] instanceof TokenFunction)
+
+ ||
+ // Or the operator at the top of the operator stack
+ // has (left associative and equal precedence)
+ // or has greater precedence
+ (($stack[$count-1] instanceof InterfaceOperator) &&
+ (
+ ($stack[$count-1]->getAssociation() == AbstractOperator::LEFT_ASSOC &&
+ $token->getPriority() == $stack[$count-1]->getPriority())
+ ||
+ ($stack[$count-1]->getPriority() > $token->getPriority())
+ )
+ )
+ )
+
+ // And not a left bracket
+ && ( ! ($stack[$count-1] instanceof TokenLeftBracket)) ) {
+ $output[] = array_pop($stack);
+ }
+
+ array_push($stack, $token);
+ }
+ elseif ($token instanceof TokenLeftBracket) {
+ array_push($stack, $token);
+ }
+ elseif ($token instanceof TokenRightBracket) {
+ while (($current = array_pop($stack)) && ( ! ($current instanceof TokenLeftBracket))) {
+ $output[] = $current;
+ }
+ if (!empty($stack) && ($stack[count($stack)-1] instanceof TokenFunction)) {
+ $output[] = array_pop($stack);
+ }
+ }
+ }
+ while (!empty($stack)) {
+ $token = array_pop($stack);
+ if ($token instanceof TokenLeftBracket || $token instanceof TokenRightBracket) {
+ throw new IncorrectBracketsException();
+ }
+ $output[] = $token;
+ }
+
+ return $output;
+ }
+}
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