classPrecedenceDeclaration

packages/bison-parser/src/Ast/Declaration/Symbols/PrecedenceDeclaration.php:24

final class PrecedenceDeclaration
    implements Declaration

Public API: explicitly declared with @visibility public.

A %left, %right, %nonassoc or %precedence directive and the tokens it ranks.

Every directive ranks its tokens above those of the directives before it. A string here is a token of its own, not an alias of the identifier before it, which is how Bison reads %left FOO "foo".

Reading operator precedencedoctest

$file = (new \BisonParser\Parser())->parse("%left '+' '-'\n%left '*'\n%%\ns: 'a';\n");
    $file->declarations[1]->associativity->value // => 'left'
    $file->declarations[1]->entries[0]->symbol->value // => '*'

Properties§

public Associativity $associativity

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public list<SymbolEntry> $entries

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public Location $location

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Methods§

public function __construct(
    public Associativity $associativity,
    public list<SymbolEntry> $entries,
    public Location $location,
)

source §

Parameters

`$associativity`	`Associativity`	Which directive it is
`$entries`	`list<SymbolEntry>`	The tokens in order, at least one
`$location`	`Location`	Where the directive is written