classRule

packages/sql-parser/src/Grammar/Rule.php:16

final class Rule

Restricted visibility: declared "@visibility root". Code outside that scope must not name this declaration.

One production of a grammar, numbered in the order it was declared.

Rule zero is always the augmented start rule. A hidden rule is one the reader synthesised for a mid-rule action; it derives the empty string and is left out of the syntax tree.

Properties§

public int $index

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public int $lhs

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public list<int> $rhs

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public int $ordinal

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public bool $hidden = false

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public int|null $precedenceSymbol = null

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Methods§

public function __construct(
    public int $index,
    public int $lhs,
    public list<int> $rhs,
    public int $ordinal,
    public bool $hidden = false,
    public int|null $precedenceSymbol = null,
)

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Parameters

`$index`	`int`	Position among all rules, zero for the start rule
`$lhs`	`int`	Nonterminal the rule derives
`$rhs`	`list<int>`	Symbols the rule expands to, in order
`$ordinal`	`int`	Position among the alternatives of the same nonterminal
`$hidden`	`bool`	Whether the rule was synthesised for a mid-rule action
`$precedenceSymbol`	`int\|null`	Terminal named to lend its precedence, if any