RuleParser::parse() - Code Metrics - Inspection of "fixed AnalyzerTest and EngineTest" - lechimp-p/dicto.php - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( f7852e...e666ea )

by Richard

created 2016-09-29 20:23 UTC

RuleParser::parse() A

↳ Parent: RuleParser

Complexity

Conditions	1
Paths	1

Size

Total Lines	6
Code Lines	5

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	5
CRAP Score	1

Importance

Changes

Metric	Value
dl	0
loc	6
ccs	5
cts	5
cp	1
rs	9.4285
c	0
b	0
f	0
cc	1
eloc	5
nc	1
nop	1
crap	1

<?php
/******************************************************************************
 * An implementation of dicto (scg.unibe.ch/dicto) in and for PHP.
 *
 * Copyright (c) 2016 Richard Klees <[email protected]>
 * 
 * This software is licensed under The MIT License. You should have received
 * a copy of the license along with the code.
 */

namespace Lechimp\Dicto\Definition;

use Lechimp\Dicto\Rules\Ruleset;
use Lechimp\Dicto\Variables as V;
use Lechimp\Dicto\Rules as R;

/**
 * Parser for Rulesets.
 */
class RuleParser extends Parser implements ArgumentParser {
    const EXPLANATION_RE = "[/][*][*](([^*]|([*][^/]))*)[*][/]";
    const SINGLE_LINE_COMMENT_RE = "[/][/]([^\n]*)";
    const MULTI_LINE_COMMENT_RE = "[/][*](([^*]|([*][^/]))*)[*][/]";
    const ASSIGNMENT_RE = "(\w+)\s*=\s*";
    const STRING_RE = "[\"]((([\\\\][\"])|[^\"])+)[\"]";
    const RULE_MODE_RE = "must|can(not)?";

    /**
     * @var V\Variable[]
     */
    protected $predefined_variables;

    /**
     * @var R\Schema[]
     */
    protected $schemas;

    /**
     * @var R\Property[]
     */
    protected $properties;

    /**
     * @var V\Variable[]
     */
    protected $variables = array();

    /**
     * @var R\Rule[]
     */
    protected $rules = array();

    /**
     * @var string|null
     */
    protected $last_explanation = null;

    /**
     * TODO: make arrays passed by reference as they get copied anyway.
     *
     * @param   V\Variable[]    $predefined_variables
     * @param   R\Schema[]      $schemas
     * @param   V\Property[]    $properties
     */
    public function __construct( array $predefined_variables
                               , array $schemas
                               , array $properties) {
        $this->predefined_variables = array_map(function(V\Variable $v) {
            return $v;
        }, $predefined_variables);
        $this->schemas = array_map(function(R\Schema $s) {
            return $s;
        }, $schemas);
        $this->properties = array_map(function(V\Property $p) {
            return $p;
        }, $properties);
        parent::__construct();
    }

    // Definition of symbols in the parser

    /**
     * @inheritdocs
     */
    protected function add_symbols_to(SymbolTable $table) {
        $this->add_symbols_for_comments($table);

        $this->add_symbols_for_variables_to($table);

        $this->add_symbols_for_rules_to($table);

        // Strings
        $table->symbol(self::STRING_RE);

        // Assignment 
        $table->symbol(self::ASSIGNMENT_RE);

        // Names
        $table->literal("\w+", function (array &$matches) {
                return $this->get_variable($matches[0]);
            });

        // End of statement
        $table->symbol("\n");
    }

    /**
     * @param   SymbolTable
     * @return  null
     */
    protected function add_symbols_for_comments(SymbolTable $table) {
        $table->symbol(self::EXPLANATION_RE);
        $table->symbol(self::SINGLE_LINE_COMMENT_RE);
        $table->symbol(self::MULTI_LINE_COMMENT_RE);
    }

    /**
     * @param   SymbolTable
     * @return  null
     */
    protected function add_symbols_for_variables_to(SymbolTable $table) {
        // Any
        $table->operator("{")
            ->null_denotation_is(function() {
                $arr = array();
                while(true) {
                    $arr[] = $this->variable(0);
                    if ($this->is_current_token_operator("}")) {
                        $this->advance_operator("}");
                        return new V\Any($arr);
                    }
                    $this->advance_operator(",");
                }
            });
        $table->operator("}");
        $table->operator(",");

        // Except
        $table->symbol("except", 10)
            ->left_denotation_is(function($left, array &$matches) {

                if (!($left instanceof V\Variable)) {
                    throw new ParserException
                        ("Expected a variable at the left of except.");
                }
                $right = $this->variable(10);
                return new V\Except($left, $right);
            });

        $this->add_symbols_for_properties_to($table, $this->properties);
    }

    /**
     * @param   SymbolTable     $table
     * @param   V\Property[]    $properties
     * @return  null
     */
    protected function add_symbols_for_properties_to(SymbolTable $table, array &$properties) {
        foreach ($properties as $property) {
            $table->symbol($property->parse_as().":", 20)
                ->left_denotation_is(function($left) use ($property) {
                    if (!($left instanceof V\Variable)) {
                        throw new ParserException
                            ("Expected a variable at the left of \"with name:\".");
                    }
                    $this->is_start_of_rule_arguments = true;
                    $arguments = $property->fetch_arguments($this);
                    assert('is_array($arguments)');
                    return new V\WithProperty($left, $property, $arguments);
                });
        }
    }

    /**
     * @param   SymbolTable
     * @return  null
     */
    protected function add_symbols_for_rules_to(SymbolTable $table) {
        // Rules
        $table->symbol("only");
        $table->symbol(self::RULE_MODE_RE, 0)
            ->null_denotation_is(function (array &$matches) {
                if ($matches[0] == "can") {
                    return R\Rule::MODE_ONLY_CAN;
                }
                if ($matches[0] == "must") {
                    return R\Rule::MODE_MUST;
                }
                if ($matches[0] == "cannot") {
                    return R\Rule::MODE_CANNOT;
                }
                throw new \LogicException("Unexpected \"".$matches[0]."\".");
            });
        $this->add_symbols_for_schemas_to($table, $this->schemas);
    }

    /**
     * @param   SymbolTable     $table
     * @param   R\Schema[]    $schemas
     * @return  null
     */
    protected function add_symbols_for_schemas_to(SymbolTable $table, array &$schemas) {
        foreach ($schemas as $schema) {
            $table->symbol($schema->name())
                ->null_denotation_is(function(array &$_) use ($schema) {

                    return $schema;
                });
        }
    }

    // IMPLEMENTATION OF Parser

    /**
     * @return  Ruleset
     */
    public function parse($source) {
        $this->variables = array();
        $this->rules = array();
        $this->add_predefined_variables();
        return parent::parse($source);
    }

    /**
     * Parses the top level statements in the rules file.
     *
     * @return  Ruleset 
     */
    protected function root() {
        while (true) {
            // drop empty lines
            while ($tok = $this->is_current_token_to_be_dropped()) {
                $this->advance($tok);
            }
            if ($this->is_end_of_file_reached()) {
                break;
            }

            // A top level statments is either..
            // ..an explanation
            if ($this->is_current_token_matched_by(self::EXPLANATION_RE)) {
                $m = $this->current_match();
                $this->last_explanation = $this->trim_explanation($m[1]);
                $this->advance(self::EXPLANATION_RE);
            }
            // ..an assignment to a variable.
            elseif ($this->is_current_token_matched_by(self::ASSIGNMENT_RE)) {
                $this->variable_assignment();
                $this->last_explanation = null;
            }
            // ..or a rule declaration
            else {
                $this->rule_declaration();
                $this->last_explanation = null;
            }

            if ($this->is_end_of_file_reached()) {
                break;
            }
            $this->advance("\n");
        }
        $this->purge_predefined_variables();
        return new Ruleset($this->variables, $this->rules);
    }

    /**
     * Returns currently matched whitespace or comment token if there is any.
     *
     * @return string|null
     */
    public function is_current_token_to_be_dropped() {
        if ($this->is_current_token_matched_by("\n")) {
            return "\n";
        }
        if ($this->is_current_token_matched_by(self::SINGLE_LINE_COMMENT_RE)) {
            return self::SINGLE_LINE_COMMENT_RE;
        }
        if ($this->is_current_token_matched_by(self::MULTI_LINE_COMMENT_RE)) {
            return self::MULTI_LINE_COMMENT_RE;
        }
        return null;
    }

    /**
     * @param   string
     * @return  string
     */
    protected function trim_explanation($content) {
        return trim(
            preg_replace("%\s*\n\s*([*]\s*)?%s", "\n", $content)
        );
    }

    // EXPRESSION TYPES

    /**
     * Fetch a rule mode from the stream.
     *
     * @return mixed
     */
    protected function rule_mode() {
        $this->is_current_token_matched_by(self::RULE_MODE_RE);
        $t = $this->current_symbol();
        $m = $this->current_match();
        $this->fetch_next_token();
        $mode = $t->null_denotation($m);
        return $mode;
    }

    /**
     * Fetch a string from the stream.
     *
     * @return  string
     */
    protected function string() {
        if (!$this->is_current_token_matched_by(self::STRING_RE)) {
            throw new ParserException("Expected string.");
        }
        $m = $this->current_match();
        $this->fetch_next_token();
        return  str_replace("\\\"", "\"",
                    str_replace("\\n", "\n",
                        $m[1]));
    }

    /**
     * Fetch a variable from the stream.
     *
     * @return  V\Variable
     */
    protected function variable($right_binding_power = 0) {
        $t = $this->current_symbol();
        $m = $this->current_match();
        $this->fetch_next_token();
        $left = $t->null_denotation($m);

        while ($right_binding_power < $this->token[0]->binding_power()) {
            $t = $this->current_symbol();
            $m = $this->current_match();
            $this->fetch_next_token();
            $left = $t->left_denotation($left, $m);
        }

        if (!($left instanceof V\Variable)) {
            throw new ParserException("Expected variable.");
        }

        return $left;
    }

    /**
     * Fetch a rule schema and its arguments from the stream.
     *
     * @return  array   (R\Schema, array)
     */
    protected function schema() {
        $t = $this->current_symbol();
        $m = $this->current_match();
        $this->fetch_next_token();
        $schema = $t->null_denotation($m);
        if (!($schema instanceof R\Schema)) {
            throw new ParserException("Expected name of a rule schema.");
        }
        return $schema;
    }

    // TOP LEVEL STATEMENTS

    /**
     * Process a variable assignment.
     *
     * @return  null
     */
    protected function variable_assignment() {
        $m = $this->current_match(); 
        $this->fetch_next_token();
        $def = $this->variable();
        if ($this->last_explanation !== null) {
            $def = $def->withExplanation($this->last_explanation);
        }
        $this->add_variable($m[1], $def);
    }

    /**
     * Process a rule declaration.
     *
     * @return  null
     */
    protected function rule_declaration() {
        if ($this->is_current_token_matched_by("only")) {
            $this->advance("only");
        }
        $var = $this->variable();
        $mode = $this->rule_mode();
        $schema = $this->schema();
        $this->is_start_of_rule_arguments = true;
        $arguments = $schema->fetch_arguments($this);
        assert('is_array($arguments)');
        $rule = new R\Rule($mode, $var, $schema, $arguments);
        if ($this->last_explanation !== null) {
            $rule= $rule->withExplanation($this->last_explanation);
        }
        $this->rules[] = $rule;
    }


    // HANDLING OF VARIABLES

    /**
     * Add a variable to the variables currently known.
     *
     * @param   string      $name
     * @param   V\Variable  $def
     * @return null
     */
    protected function add_variable($name, V\Variable $def) {
        assert('is_string($name)');
        if (array_key_exists($name, $this->variables)) {
            throw new ParserException("Variable '$name' already defined.");
        }
        assert('$def instanceof Lechimp\\Dicto\\Variables\\Variable');
        $this->variables[$name] = $def->withName($name);
    }

    /**
     * Get a predefined variable.
     *
     * @param   string  $name
     * @return  V\Variable
     */
    protected function get_variable($name) {
        if (!array_key_exists($name, $this->variables)) {
            throw new ParserException("Unknown variable '$name'.");
        }
        return $this->variables[$name];
    }

    /**
     * Add all predefined variables to the current set of variables.
     *
     * @return null
     */
    protected function add_predefined_variables() {
        foreach ($this->predefined_variables as $predefined_var) {
            $this->add_variable($predefined_var->name(), $predefined_var);
        }
    }

    /**
     * Purge all predefined variables from the current set of variables.
     *
     * @return null
     */
    protected function purge_predefined_variables() {
        foreach ($this->predefined_variables as $predefined_var) {
            unset($this->variables[$predefined_var->name()]);
        }
    }

    // IMPLEMENTATION OF ArgumentParser

    /**
     * @var bool
     */
    protected $is_start_of_rule_arguments = false;

    protected function maybe_fetch_argument_delimiter() {
        if (!$this->is_start_of_rule_arguments) {
            $this->advance_operator(",");
            $this->is_start_of_rule_arguments = false;
        }
    }

    /**
     * @inheritdoc
     */
    public function fetch_string() {
        $this->maybe_fetch_argument_delimiter();
        return $this->string();
    }

    /**
     * @inheritdoc
     */
    public function fetch_variable() {
        $this->maybe_fetch_argument_delimiter();
        return $this->variable();
    }
}


1		<?php
2		/******************************************************************************
3		* An implementation of dicto (scg.unibe.ch/dicto) in and for PHP.
4		*
5		* Copyright (c) 2016 Richard Klees <[email protected]>
6		*
7		* This software is licensed under The MIT License. You should have received
8		* a copy of the license along with the code.
9		*/
10
11		namespace Lechimp\Dicto\Definition;
12
13		use Lechimp\Dicto\Rules\Ruleset;
14		use Lechimp\Dicto\Variables as V;
15		use Lechimp\Dicto\Rules as R;
16
17		/**
18		* Parser for Rulesets.
19		*/
20		class RuleParser extends Parser implements ArgumentParser {
21		const EXPLANATION_RE = "[/][][](([^]\|([][^/])))[][/]";
22		const SINGLE_LINE_COMMENT_RE = "[/][/]([^\n]*)";
23		const MULTI_LINE_COMMENT_RE = "[/][](([^]\|([][^/])))[*][/]";
24		const ASSIGNMENT_RE = "(\w+)\s=\s";
25		const STRING_RE = "[\"]((([\\\\][\"])\|[^\"])+)[\"]";
26		const RULE_MODE_RE = "must\|can(not)?";
27
28		/**
29		* @var V\Variable[]
30		*/
31		protected $predefined_variables;
32
33		/**
34		* @var R\Schema[]
35		*/
36		protected $schemas;
37
38		/**
39		* @var R\Property[]
40		*/
41		protected $properties;
42
43		/**
44		* @var V\Variable[]
45		*/
46		protected $variables = array();
47
48		/**
49		* @var R\Rule[]
50		*/
51		protected $rules = array();
52
53		/**
54		* @var string\|null
55		*/
56		protected $last_explanation = null;
57
58		/**
59		* TODO: make arrays passed by reference as they get copied anyway.
60		*
61		* @param V\Variable[] $predefined_variables
62		* @param R\Schema[] $schemas
63		* @param V\Property[] $properties
64		*/
65	30	public function __construct( array $predefined_variables
66		, array $schemas
67		, array $properties) {
68		$this->predefined_variables = array_map(function(V\Variable $v) {
69	30	return $v;
70	30	}, $predefined_variables);
71		$this->schemas = array_map(function(R\Schema $s) {
72	30	return $s;
73	30	}, $schemas);
74		$this->properties = array_map(function(V\Property $p) {
75	30	return $p;
76	30	}, $properties);
77	30	parent::__construct();
78	30	}
79
80		// Definition of symbols in the parser
81
82		/**
83		* @inheritdocs
84		*/
85	30	protected function add_symbols_to(SymbolTable $table) {
86	30	$this->add_symbols_for_comments($table);
87
88	30	$this->add_symbols_for_variables_to($table);
89
90	30	$this->add_symbols_for_rules_to($table);
91
92		// Strings
93	30	$table->symbol(self::STRING_RE);
94
95		// Assignment
96	30	$table->symbol(self::ASSIGNMENT_RE);
97
98		// Names
99		$table->literal("\w+", function (array &$matches) {
100	25	return $this->get_variable($matches[0]);
101	30	});
102
103		// End of statement
104	30	$table->symbol("\n");
105	30	}
106
107		/**
108		* @param SymbolTable
109		* @return null
110		*/
111	30	protected function add_symbols_for_comments(SymbolTable $table) {
112	30	$table->symbol(self::EXPLANATION_RE);
113	30	$table->symbol(self::SINGLE_LINE_COMMENT_RE);
114	30	$table->symbol(self::MULTI_LINE_COMMENT_RE);
115	30	}
116
117		/**
118		* @param SymbolTable
119		* @return null
120		*/
121	30	protected function add_symbols_for_variables_to(SymbolTable $table) {
122		// Any
123	30	$table->operator("{")
124		->null_denotation_is(function() {
125	4	$arr = array();
126	4	while(true) {
127	4	$arr[] = $this->variable(0);
128	4	if ($this->is_current_token_operator("}")) {
129	4	$this->advance_operator("}");
130	4	return new V\Any($arr);
131		}
132	4	$this->advance_operator(",");
133	4	}
134	30	});
135	30	$table->operator("}");
136	30	$table->operator(",");
137
138		// Except
139	30	$table->symbol("except", 10)
140		->left_denotation_is(function($left, array &$matches) {
		0 ignored issues – show Unused Code introduced 2016-08-01 18:35 UTC by Report Bug Copy Issue Report The parameter `$matches` is not used and could be removed. This check looks from parameters that have been defined for a function or method, but which are not used in the method body. Loading history...
141	4	if (!($left instanceof V\Variable)) {
142		throw new ParserException
143		("Expected a variable at the left of except.");
144		}
145	4	$right = $this->variable(10);
146	4	return new V\Except($left, $right);
147	30	});
148
149	30	$this->add_symbols_for_properties_to($table, $this->properties);
150	30	}
151
152		/**
153		* @param SymbolTable $table
154		* @param V\Property[] $properties
155		* @return null
156		*/
157	30	protected function add_symbols_for_properties_to(SymbolTable $table, array &$properties) {
158	30	foreach ($properties as $property) {
159	30	$table->symbol($property->parse_as().":", 20)
160		->left_denotation_is(function($left) use ($property) {
161	5	if (!($left instanceof V\Variable)) {
162		throw new ParserException
163		("Expected a variable at the left of \"with name:\".");
164		}
165	5	$this->is_start_of_rule_arguments = true;
166	5	$arguments = $property->fetch_arguments($this);
167	5	assert('is_array($arguments)');
168	5	return new V\WithProperty($left, $property, $arguments);
169	30	});
170	30	}
171	30	}
172
173		/**
174		* @param SymbolTable
175		* @return null
176		*/
177	30	protected function add_symbols_for_rules_to(SymbolTable $table) {
178		// Rules
179	30	$table->symbol("only");
180	30	$table->symbol(self::RULE_MODE_RE, 0)
181		->null_denotation_is(function (array &$matches) {
182	9	if ($matches[0] == "can") {
183	1	return R\Rule::MODE_ONLY_CAN;
184		}
185	8	if ($matches[0] == "must") {
186	4	return R\Rule::MODE_MUST;
187		}
188	4	if ($matches[0] == "cannot") {
189	4	return R\Rule::MODE_CANNOT;
190		}
191		throw new \LogicException("Unexpected \"".$matches[0]."\".");
192	30	});
193	30	$this->add_symbols_for_schemas_to($table, $this->schemas);
194	30	}
195
196		/**
197		* @param SymbolTable $table
198		* @param R\Schema[] $schemas
199		* @return null
200		*/
201	30	protected function add_symbols_for_schemas_to(SymbolTable $table, array &$schemas) {
202	30	foreach ($schemas as $schema) {
203	30	$table->symbol($schema->name())
204	30	->null_denotation_is(function(array &$_) use ($schema) {
		0 ignored issues – show Unused Code introduced 2016-08-01 18:35 UTC by Report Bug Copy Issue Report The parameter `$_` is not used and could be removed. This check looks from parameters that have been defined for a function or method, but which are not used in the method body. Loading history...
205	9	return $schema;
206	30	});
207	30	}
208	30	}
209
210		// IMPLEMENTATION OF Parser
211
212		/**
213		* @return Ruleset
214		*/
215	30	public function parse($source) {
216	30	$this->variables = array();
217	30	$this->rules = array();
218	30	$this->add_predefined_variables();
219	30	return parent::parse($source);
220		}
221
222		/**
223		* Parses the top level statements in the rules file.
224		*
225		* @return Ruleset
226		*/
227	20	protected function root() {
228	20	while (true) {
229		// drop empty lines
230	20	while ($tok = $this->is_current_token_to_be_dropped()) {
231	6	$this->advance($tok);
232	6	}
233	20	if ($this->is_end_of_file_reached()) {
234	3	break;
235		}
236
237		// A top level statments is either..
238		// ..an explanation
239	19	if ($this->is_current_token_matched_by(self::EXPLANATION_RE)) {
240	5	$m = $this->current_match();
241	5	$this->last_explanation = $this->trim_explanation($m[1]);
242	5	$this->advance(self::EXPLANATION_RE);
243	5	}
244		// ..an assignment to a variable.
245	19	elseif ($this->is_current_token_matched_by(self::ASSIGNMENT_RE)) {
246	11	$this->variable_assignment();
247	11	$this->last_explanation = null;
248	11	}
249		// ..or a rule declaration
250		else {
251	9	$this->rule_declaration();
252	9	$this->last_explanation = null;
253		}
254
255	19	if ($this->is_end_of_file_reached()) {
256	17	break;
257		}
258	8	$this->advance("\n");
259	8	}
260	20	$this->purge_predefined_variables();
261	20	return new Ruleset($this->variables, $this->rules);
262		}
263
264		/**
265		* Returns currently matched whitespace or comment token if there is any.
266		*
267		* @return string\|null
268		*/
269	20	public function is_current_token_to_be_dropped() {
270	20	if ($this->is_current_token_matched_by("\n")) {
271	6	return "\n";
272		}
273	20	if ($this->is_current_token_matched_by(self::SINGLE_LINE_COMMENT_RE)) {
274	1	return self::SINGLE_LINE_COMMENT_RE;
275		}
276	20	if ($this->is_current_token_matched_by(self::MULTI_LINE_COMMENT_RE)) {
277	1	return self::MULTI_LINE_COMMENT_RE;
278		}
279	20	return null;
280		}
281
282		/**
283		* @param string
284		* @return string
285		*/
286	5	protected function trim_explanation($content) {
287	5	return trim(
288	5	preg_replace("%\s\n\s([]\s)?%s", "\n", $content)
289	5	);
290		}
291
292		// EXPRESSION TYPES
293
294		/**
295		* Fetch a rule mode from the stream.
296		*
297		* @return mixed
298		*/
299	9	protected function rule_mode() {
300	9	$this->is_current_token_matched_by(self::RULE_MODE_RE);
301	9	$t = $this->current_symbol();
302	9	$m = $this->current_match();
303	9	$this->fetch_next_token();
304	9	$mode = $t->null_denotation($m);
305	9	return $mode;
306		}
307
308		/**
309		* Fetch a string from the stream.
310		*
311		* @return string
312		*/
313	12	protected function string() {
314	12	if (!$this->is_current_token_matched_by(self::STRING_RE)) {
315		throw new ParserException("Expected string.");
316		}
317	12	$m = $this->current_match();
318	12	$this->fetch_next_token();
319	12	return str_replace("\\\"", "\"",
320	12	str_replace("\\n", "\n",
321	12	$m[1]));
322		}
323
324		/**
325		* Fetch a variable from the stream.
326		*
327		* @return V\Variable
328		*/
329	25	protected function variable($right_binding_power = 0) {
330	25	$t = $this->current_symbol();
331	25	$m = $this->current_match();
332	25	$this->fetch_next_token();
333	25	$left = $t->null_denotation($m);
334
335	25	while ($right_binding_power < $this->token[0]->binding_power()) {
336	8	$t = $this->current_symbol();
337	8	$m = $this->current_match();
338	8	$this->fetch_next_token();
339	8	$left = $t->left_denotation($left, $m);
340	8	}
341
342	25	if (!($left instanceof V\Variable)) {
343		throw new ParserException("Expected variable.");
344		}
345
346	25	return $left;
347		}
348
349		/**
350		* Fetch a rule schema and its arguments from the stream.
351		*
352		* @return array (R\Schema, array)
353		*/
354	9	protected function schema() {
355	9	$t = $this->current_symbol();
356	9	$m = $this->current_match();
357	9	$this->fetch_next_token();
358	9	$schema = $t->null_denotation($m);
359	9	if (!($schema instanceof R\Schema)) {
360		throw new ParserException("Expected name of a rule schema.");
361		}
362	9	return $schema;
363		}
364
365		// TOP LEVEL STATEMENTS
366
367		/**
368		* Process a variable assignment.
369		*
370		* @return null
371		*/
372	11	protected function variable_assignment() {
373	11	$m = $this->current_match();
374	11	$this->fetch_next_token();
375	11	$def = $this->variable();
376	11	if ($this->last_explanation !== null) {
377	4	$def = $def->withExplanation($this->last_explanation);
378	4	}
379	11	$this->add_variable($m[1], $def);
380	11	}
381
382		/**
383		* Process a rule declaration.
384		*
385		* @return null
386		*/
387	9	protected function rule_declaration() {
388	9	if ($this->is_current_token_matched_by("only")) {
389	1	$this->advance("only");
390	1	}
391	9	$var = $this->variable();
392	9	$mode = $this->rule_mode();
393	9	$schema = $this->schema();
394	9	$this->is_start_of_rule_arguments = true;
395	9	$arguments = $schema->fetch_arguments($this);
396	9	assert('is_array($arguments)');
397	9	$rule = new R\Rule($mode, $var, $schema, $arguments);
398	9	if ($this->last_explanation !== null) {
399	1	$rule= $rule->withExplanation($this->last_explanation);
400	1	}
401	9	$this->rules[] = $rule;
402	9	}
403
404
405		// HANDLING OF VARIABLES
406
407		/**
408		* Add a variable to the variables currently known.
409		*
410		* @param string $name
411		* @param V\Variable $def
412		* @return null
413		*/
414	30	protected function add_variable($name, V\Variable $def) {
415	30	assert('is_string($name)');
416	30	if (array_key_exists($name, $this->variables)) {
417		throw new ParserException("Variable '$name' already defined.");
418		}
419	30	assert('$def instanceof Lechimp\\Dicto\\Variables\\Variable');
420	30	$this->variables[$name] = $def->withName($name);
421	30	}
422
423		/**
424		* Get a predefined variable.
425		*
426		* @param string $name
427		* @return V\Variable
428		*/
429	25	protected function get_variable($name) {
430	25	if (!array_key_exists($name, $this->variables)) {
431		throw new ParserException("Unknown variable '$name'.");
432		}
433	25	return $this->variables[$name];
434		}
435
436		/**
437		* Add all predefined variables to the current set of variables.
438		*
439		* @return null
440		*/
441	30	protected function add_predefined_variables() {
442	30	foreach ($this->predefined_variables as $predefined_var) {
443	30	$this->add_variable($predefined_var->name(), $predefined_var);
444	30	}
445	30	}
446
447		/**
448		* Purge all predefined variables from the current set of variables.
449		*
450		* @return null
451		*/
452	20	protected function purge_predefined_variables() {
453	20	foreach ($this->predefined_variables as $predefined_var) {
454	20	unset($this->variables[$predefined_var->name()]);
455	20	}
456	20	}
457
458		// IMPLEMENTATION OF ArgumentParser
459
460		/**
461		* @var bool
462		*/
463		protected $is_start_of_rule_arguments = false;
464
465	12	protected function maybe_fetch_argument_delimiter() {
466	12	if (!$this->is_start_of_rule_arguments) {
467		$this->advance_operator(",");
468		$this->is_start_of_rule_arguments = false;
469		}
470	12	}
471
472		/**
473		* @inheritdoc
474		*/
475	8	public function fetch_string() {
476	8	$this->maybe_fetch_argument_delimiter();
477	8	return $this->string();
478		}
479
480		/**
481		* @inheritdoc
482		*/
483	5	public function fetch_variable() {
484	5	$this->maybe_fetch_argument_delimiter();
485	5	return $this->variable();
486		}
487		}
488

lechimp-p / dicto.php

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RuleParser::parse() A

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