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<?php /* * This file is part of Psy Shell. * * (c) 2012-2026 Justin Hileman * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Psy\Readline\Interactive\Actions; use Psy\Readline\Interactive\Input\Buffer; use Psy\Readline\Interactive\Readline; use Psy\Readline\Interactive\Terminal; /** * Dedent leading indentation to the previous tab stop. * * Returns false when the cursor is not in leading indentation. */ class DedentLeadingIndentationAction implements ActionInterface { /** * {@inheritdoc} */ public function execute(Buffer $buffer, Terminal $terminal, Readline $readline): bool { if (!$readline->isMultilineMode()) { return false; } $line = $buffer->getCurrentLineText(); $indentLength = \strspn($line, " \t"); if ($indentLength === 0) { return false; } $cursorInLine = $buffer->getCursorPositionInLine(); if ($cursorInLine > $indentLength) { return false; } // Cursor is at line start: forward-delete leading indentation. if ($cursorInLine === 0) { if ($line[0] === "\t") { return $buffer->deleteForward(1); } $leadingSpaces = \strspn($line, ' '); return $buffer->deleteForward($buffer->spacesToPreviousTabStop($leadingSpaces)); } // Cursor is within leading whitespace: backward-delete to previous tab stop. if ($line[$cursorInLine - 1] === "\t") { return $buffer->deleteBackward(1); } $beforeCursor = \substr($line, 0, $cursorInLine); $trailingSpaces = \strlen($beforeCursor) - \strlen(\rtrim($beforeCursor, ' ')); return $buffer->deleteBackward($buffer->spacesToPreviousTabStop($trailingSpaces)); } /** * {@inheritdoc} */ public function getName(): string { return 'dedent-leading-indentation'; } }
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