From 2b619d767b09755fe8182299a03d105af6bcf1aa Mon Sep 17 00:00:00 2001
From: Adam Pippin <adam@label-engine.com>
Date: Wed, 17 Feb 2021 01:40:54 -0800
Subject: [PATCH] Remove old expression parser

---
 app/Cfnpp/Expression/Parser.php              | 61 ------------
 app/Cfnpp/Expression/TokenFunction.php       | 90 ------------------
 app/Cfnpp/Expression/TokenNumericLiteral.php | 87 ------------------
 app/Cfnpp/Expression/TokenOperator.php       | 97 --------------------
 app/Cfnpp/Expression/TokenStringLiteral.php  | 95 -------------------
 app/Cfnpp/Expression/TokenVariable.php       | 79 ----------------
 6 files changed, 509 deletions(-)
 delete mode 100644 app/Cfnpp/Expression/Parser.php
 delete mode 100644 app/Cfnpp/Expression/TokenFunction.php
 delete mode 100644 app/Cfnpp/Expression/TokenNumericLiteral.php
 delete mode 100644 app/Cfnpp/Expression/TokenOperator.php
 delete mode 100644 app/Cfnpp/Expression/TokenStringLiteral.php
 delete mode 100644 app/Cfnpp/Expression/TokenVariable.php

diff --git a/app/Cfnpp/Expression/Parser.php b/app/Cfnpp/Expression/Parser.php
deleted file mode 100644
index c87d3aa..0000000
--- a/app/Cfnpp/Expression/Parser.php
+++ /dev/null
@@ -1,61 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace App\Cfnpp\Expression;
-
-/**
- * Parse a string into a series of expression tokens.
- *
- * @author Adam Pippin <hello@adampippin.ca>
- */
-class Parser
-{
-	/**
-	 * List of class names of tokens this parser will parse.
-	 *
-	 * @var string[]
-	 */
-	public const TOKEN_TYPES = [
-		TokenFunction::class,
-		TokenNumericLiteral::class,
-		TokenOperator::class,
-		TokenStringLiteral::class,
-		TokenVariable::class
-	];
-
-	/**
-	 * Parse a string into an expression.
-	 *
-	 * @param  string     $value
-	 * @return Expression
-	 */
-	public function parse(string $value): Expression
-	{
-		$original_value = $value;
-		$value .= ' ';
-		$tokens = [];
-		while (strlen($value) > 0)
-		{
-			foreach (static::TOKEN_TYPES as $token_class)
-			{
-				if ($token_class::isToken($value))
-				{
-					$tokens[] = $token_class::getToken($value);
-
-					if (substr($value, 0, 1) != ' ')
-					{
-						throw new \Exception('Incompletely consumed token at offset '.(strlen($original_value) - strlen($value)).' in expression '.$original_value);
-					}
-
-					$value = substr($value, 1);
-					continue 2;
-				}
-			}
-
-			throw new \Exception('Unparseable value at offset '.(strlen($original_value) - strlen($value)).' in expression '.$original_value);
-		}
-
-		return new Expression($tokens);
-	}
-}
diff --git a/app/Cfnpp/Expression/TokenFunction.php b/app/Cfnpp/Expression/TokenFunction.php
deleted file mode 100644
index b597a96..0000000
--- a/app/Cfnpp/Expression/TokenFunction.php
+++ /dev/null
@@ -1,90 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace App\Cfnpp\Expression;
-
-/**
- * Token representing a function.
- *
- * @author Adam Pippin <hello@adampippin.ca>
- */
-class TokenFunction extends Token
-{
-	/**
-	 * List of valid functions this can parse.
-	 * @var string[]
-	 */
-	public const FUNCTIONS = [
-		'concat*',
-		'concat'
-	];
-
-	/**
-	 * Function this token represents.
-	 * @var string
-	 */
-	protected $function;
-
-	/**
-	 * Create a new function token.
-	 *
-	 * @param string $function
-	 */
-	public function __construct($function)
-	{
-		$this->function = $function;
-	}
-
-	/**
-	 * Get the function this token represents.
-	 *
-	 * @return string
-	 */
-	public function getFunction(): string
-	{
-		return $this->function;
-	}
-
-	/**
-	 * Determine whether a function token can be parsed from a stream.
-	 *
-	 * @param  string $stream
-	 * @return bool
-	 */
-	public static function isToken(string $stream): bool
-	{
-		foreach (static::FUNCTIONS as $function)
-		{
-			if (strlen($stream) > strlen($function) &&
-				substr($stream, 0, strlen($function)) == $function)
-			{
-				return true;
-			}
-		}
-		return false;
-	}
-
-	/**
-	 * Parse a function token from a stream.
-	 *
-	 * Returns token, and modifies stream to remove all consumed characters
-	 *
-	 * @param  string $stream
-	 * @return Token
-	 */
-	public static function getToken(string &$stream): Token
-	{
-		foreach (static::FUNCTIONS as $function)
-		{
-			if (strlen($stream) > strlen($function) &&
-				substr($stream, 0, strlen($function)) == $function)
-			{
-				$function = substr($stream, 0, strlen($function));
-				$stream = substr($stream, strlen($function));
-				return new TokenFunction($function);
-			}
-		}
-		throw new \Exception('Could not parse function token!');
-	}
-}
diff --git a/app/Cfnpp/Expression/TokenNumericLiteral.php b/app/Cfnpp/Expression/TokenNumericLiteral.php
deleted file mode 100644
index 32fcfde..0000000
--- a/app/Cfnpp/Expression/TokenNumericLiteral.php
+++ /dev/null
@@ -1,87 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace App\Cfnpp\Expression;
-
-/**
- * Token representing a numeric (integer or float) literal.
- *
- * @author Adam Pippin <hello@adampippin.ca>
- */
-class TokenNumericLiteral extends Token
-{
-	/**
-	 * Numeric value this token represents.
-	 * @var int|float
-	 */
-	protected $value;
-
-	/**
-	 * Create a new numeric literal.
-	 *
-	 * @param int|float $value
-	 */
-	public function __construct($value)
-	{
-		$this->value = $value;
-	}
-
-	/**
-	 * Get the value this token represents.
-	 *
-	 * @return int|float
-	 */
-	public function getValue()
-	{
-		return $this->value;
-	}
-
-	/**
-	 * Determine whether a numeric token can be parsed from a stream.
-	 *
-	 * @param  string $stream
-	 * @return bool
-	 */
-	public static function isToken(string $stream): bool
-	{
-		return is_numeric($stream[0]);
-	}
-
-	/**
-	 * Parse a numeric token from a stream.
-	 *
-	 * Returns token, and modifies stream to remove all consumed characters.
-	 *
-	 * @param  string $stream
-	 * @return Token
-	 */
-	public static function getToken(string &$stream): Token
-	{
-		$buffer = '';
-		for ($i = 0; $i < strlen($stream); $i++)
-		{
-			if (preg_match('/^[0-9]$/', $stream[$i]))
-			{
-				$buffer .= $stream[$i];
-			}
-			else
-			{
-				break;
-			}
-		}
-
-		$stream = substr($stream, strlen($buffer));
-
-		if (stristr($buffer, '.'))
-		{
-			$buffer = (float)$buffer;
-		}
-		else
-		{
-			$buffer = (int)$buffer;
-		}
-
-		return new TokenNumericLiteral($buffer);
-	}
-}
diff --git a/app/Cfnpp/Expression/TokenOperator.php b/app/Cfnpp/Expression/TokenOperator.php
deleted file mode 100644
index 5d3bce3..0000000
--- a/app/Cfnpp/Expression/TokenOperator.php
+++ /dev/null
@@ -1,97 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace App\Cfnpp\Expression;
-
-/**
- * Token representing a comparison operator.
- *
- * @author Adam Pippin <hello@adampippin.ca>
- */
-class TokenOperator extends Token
-{
-	/**
-	 * List of valid operators this can parse.
-	 * @var string[]
-	 */
-	public const OPERATORS = [
-		'eq',
-		'neq',
-		'gt',
-		'gte',
-		'lt',
-		'lte',
-		'and',
-		'or',
-    'not'
-	];
-
-	/**
-	 * Operator this token represents.
-	 * @var string
-	 */
-	protected $operator;
-
-	/**
-	 * Create a new operator token.
-	 *
-	 * @param string $operator
-	 */
-	public function __construct($operator)
-	{
-		$this->operator = $operator;
-	}
-
-	/**
-	 * Get the operator this token represents.
-	 *
-	 * @return string
-	 */
-	public function getOperator(): string
-	{
-		return $this->operator;
-	}
-
-	/**
-	 * Determine whether a operator token can be parsed from a stream.
-	 *
-	 * @param  string $stream
-	 * @return bool
-	 */
-	public static function isToken(string $stream): bool
-	{
-		foreach (static::OPERATORS as $operator)
-		{
-			if (strlen($stream) > strlen($operator) &&
-				substr($stream, 0, strlen($operator)) == $operator)
-			{
-				return true;
-			}
-		}
-		return false;
-	}
-
-	/**
-	 * Parse an operator token from a stream.
-	 *
-	 * Returns token, and modifies stream to remove all consumed characters
-	 *
-	 * @param  string $stream
-	 * @return Token
-	 */
-	public static function getToken(string &$stream): Token
-	{
-		foreach (static::OPERATORS as $operator)
-		{
-			if (strlen($stream) > strlen($operator) &&
-				substr($stream, 0, strlen($operator)) == $operator)
-			{
-				$operator = substr($stream, 0, strlen($operator));
-				$stream = substr($stream, strlen($operator));
-				return new TokenOperator($operator);
-			}
-		}
-		throw new \Exception('Could not parse operator token!');
-	}
-}
diff --git a/app/Cfnpp/Expression/TokenStringLiteral.php b/app/Cfnpp/Expression/TokenStringLiteral.php
deleted file mode 100644
index 0ea6ec6..0000000
--- a/app/Cfnpp/Expression/TokenStringLiteral.php
+++ /dev/null
@@ -1,95 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace App\Cfnpp\Expression;
-
-/**
- * Token representing a string literal.
- *
- * @author Adam Pippin <hello@adampippin.ca>
- */
-class TokenStringLiteral extends Token
-{
-	/**
-	 * Value of the string literal.
-	 * @var string
-	 */
-	protected $value;
-
-	/**
-	 * Create a new string literal token.
-	 *
-	 * @param string $value
-	 */
-	public function __construct(string $value)
-	{
-		$this->value = $value;
-	}
-
-	/**
-	 * Get the value of the string literal.
-	 *
-	 * @return string
-	 */
-	public function getValue(): string
-	{
-		return $this->value;
-	}
-
-	/**
-	 * Determine whether a string token can be parsed from a stream.
-	 *
-	 * @param  string $stream
-	 * @return bool
-	 */
-	public static function isToken(string $stream): bool
-	{
-		return $stream[0] == '"';
-	}
-
-	/**
-	 * Parse a string literal token from a stream.
-	 *
-	 * Returns token, and modifies stream to remove all consumed characters
-	 *
-	 * @param  string $stream
-	 * @return Token
-	 */
-	public static function getToken(string &$stream): Token
-	{
-		$buffer = '';
-		$in_string = false;
-		$escaped = false;
-
-		for ($i = 0; $i < strlen($stream); $i++)
-		{
-			if ($escaped)
-			{
-				$buffer .= $stream[$i];
-				$escaped = false;
-			}
-			elseif ($stream[$i] == '"')
-			{
-				if ($in_string)
-				{
-					break;
-				}
-
-				$in_string = true;
-			}
-			elseif ($stream[$i] == '\\')
-			{
-				$escaped = true;
-			}
-			else
-			{
-				$buffer .= $stream[$i];
-			}
-		}
-
-		$stream = substr($stream, $i + 1);
-
-		return new TokenStringLiteral($buffer);
-	}
-}
diff --git a/app/Cfnpp/Expression/TokenVariable.php b/app/Cfnpp/Expression/TokenVariable.php
deleted file mode 100644
index b17cca2..0000000
--- a/app/Cfnpp/Expression/TokenVariable.php
+++ /dev/null
@@ -1,79 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace App\Cfnpp\Expression;
-
-/**
- * Expression token referencing a variable.
- *
- * @author Adam Pippin <hello@adampippin.ca>
- */
-class TokenVariable extends Token
-{
-	/**
-	 * Name of the variable this token references.
-	 * @var string
-	 */
-	protected $name;
-
-	/**
-	 * Create a new variable token.
-	 *
-	 * @param string $name
-	 */
-	public function __construct(string $name)
-	{
-		$this->name = $name;
-	}
-
-	/**
-	 * Get the name of the variable this token references.
-	 *
-	 * @return string
-	 */
-	public function getName(): string
-	{
-		return $this->name;
-	}
-
-	/**
-	 * Determine whether a variable name token can be parsed from a stream.
-	 *
-	 * @param  string $stream
-	 * @return bool
-	 */
-	public static function isToken(string $stream): bool
-	{
-		return (bool)preg_match('/^[A-Za-z]$/', $stream[0]);
-	}
-
-	/**
-	 * Parse a variable token from a stream.
-	 *
-	 * Returns token, and modifies stream to remove all consumed characters.
-	 *
-	 * @param  string $stream
-	 * @return Token
-	 */
-	public static function getToken(string &$stream): Token
-	{
-		$buffer = '';
-		$buffer = $stream[0];
-		for ($i = 1; $i < strlen($stream); $i++)
-		{
-			if (preg_match('/^[A-Za-z0-9]$/', $stream[$i]))
-			{
-				$buffer .= $stream[$i];
-			}
-			else
-			{
-				break;
-			}
-		}
-
-		$stream = substr($stream, strlen($buffer));
-
-		return new TokenVariable($buffer);
-	}
-}