2024-05-06 20:40:05 +00:00
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---
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2024-10-30 17:34:11 +00:00
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date: 2020-11-16
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2024-05-06 20:40:05 +00:00
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id: e6d58583-98d8-4a0d-8d0b-a400ea4c2dc7
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title: Expression Linter
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---
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# Description
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Lint your expressions
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# Syntax
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``` php
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use Symfony\Component\ExpressionLanguage\Lexer;
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use Symfony\Component\ExpressionLanguage\Parser;
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$lexer = new Lexer();
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$parser = new Parser([]);
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$parser->lint($lexer->tokenize($expression), $allowedVariableNames);
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$expression = 'foo["some_key"].callFunction(a ? b)';
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$allowedVariableNames = ['foo', 'a', 'b'];
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// Result: no error; expression is valid.
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$expression = 'foo["some_key")';
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$allowedVariableNames = ['foo'];
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// Result: Unclosed "[" around position 3 for expression `foo["some_key")`.
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$expression = '{key: foo key2: bar}';
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$allowedVariableNames = ['foo', 'bar'];
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// Result: A hash value must be followed by a comma
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// Unexpected token "name" of value "key2" ("punctuation" expected with value ",")
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// around position 11 for expression `{key: foo key2: bar}`.
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```
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