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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\Input; use Psy\Readline\Interactive\Helper\BracketPair; /* * Calculates indentation for multiline editing. / class IndentationPolicy { private const INDENT_WIDTH = 4; /* * @param array $tokens Snapshot tokens for the current full buffer / public function calculateNextLineIndent(string $bufferText, array $tokens): string { $lines = \explode("\n", $bufferText); $lastLine = (string) \end($lines); $trimmedLastLine = \trim($lastLine); if ($trimmedLastLine === '') { return ''; } if ($this->isEndOfLineInStringOrComment($bufferText, $tokens)) { return ''; } $currentIndent = $this->getLineIndentation($lastLine); $lastChar = \substr(\rtrim($trimmedLastLine), -1); if (\in_array($lastChar, BracketPair::OPENING_BRACKETS)) { return $this->indent($currentIndent); } if ($this->endsWithControlStructure($trimmedLastLine)) { return $this->indent($currentIndent); } return $currentIndent; } /* * Add one level of indentation. / public function indent(string $currentIndent): string { return $currentIndent.\str_repeat(' ', self::INDENT_WIDTH); } /* * Remove one level of indentation. / public function dedent(string $indent): string { if ($indent === '') { return ''; } // Calculate the visual column width, accounting for tabs. $column = 0; $length = \strlen($indent); for ($i = 0; $i < $length; $i++) { $column += $indent[$i] === "\t" ? $this->spacesToNextTabStop($column) : 1; } $target = $column - $this->spacesToPreviousTabStop($column); // Find the byte position where truncating leaves us at the target column. $column = 0; for ($i = 0; $i < $length; $i++) { $column += $indent[$i] === "\t" ? $this->spacesToNextTabStop($column) : 1; if ($column > $target) { return \substr($indent, 0, $i); } } return $indent; } /* * Calculate how many spaces to remove when typing a closing bracket. * * Returns the number of leading spaces to strip from the current line * when a closing bracket is typed at the end of a whitespace-only line. * * @param string $char The character being typed * @param string $text The full buffer text * @param int $cursor The current cursor position * @param string $context Accumulated code context for bracket matching / public function calculateClosingBracketDedent(string $char, string $text, int $cursor, string $context = ''): int { if (!\in_array($char, BracketPair::CLOSING_BRACKETS)) { return 0; } $lines = \explode("\n", $text); $currentLineNum = \substr_count(\mb_substr($text, 0, $cursor), "\n"); $currentLine = $lines[$currentLineNum]; $charsBeforeLine = 0; for ($i = 0; $i < $currentLineNum; $i++) { $charsBeforeLine += \mb_strlen($lines[$i]) + 1; } $cursorInLine = $cursor - $charsBeforeLine; if (\trim($currentLine) !== '') { return 0; } if ($cursorInLine !== \mb_strlen($currentLine)) { return 0; } $leadingSpaces = \mb_strlen($currentLine) - \mb_strlen(\ltrim($currentLine)); if ($leadingSpaces === 0) { return 0; } if ($context !== '' && !BracketPair::doesClosingBracketMatch($char, $context)) { return 0; } return $this->spacesToPreviousTabStop($leadingSpaces); } /* * @param array $tokens / private function isEndOfLineInStringOrComment(string $bufferText, array $tokens): bool { if (empty($tokens)) { return false; } $lastToken = null; for ($i = \count($tokens) - 1; $i >= 0; $i--) { $token = $tokens[$i]; if (\is_array($token) && $token[0] === \T_WHITESPACE) { continue; } $lastToken = $token; break; } if ($lastToken === null) { return false; } if (\is_array($lastToken)) { $tokenType = $lastToken[0]; if ($tokenType === \T_CONSTANT_ENCAPSED_STRING \|\| $tokenType === \T_ENCAPSED_AND_WHITESPACE \|\| $tokenType === \T_START_HEREDOC \|\| $tokenType === \T_END_HEREDOC) { return true; } if ($tokenType === \T_COMMENT) { $text = \ltrim($lastToken[1]); // Only suppress indentation for block comments, not single-line return \strpos($text, '/') === 0; } if ($tokenType === \T_DOC_COMMENT) { return true; } if (\defined('T_BACKTICK') && $tokenType === T_BACKTICK) { return true; } } $trimmed = \rtrim($bufferText); $lastChar = \substr($trimmed, -1); if ($lastChar === '"' \|\| $lastChar === "'" \|\| $lastChar === '`') { $doubleQuoteCount = \substr_count($bufferText, '"'); $singleQuoteCount = \substr_count($bufferText, "'"); $backtickCount = \substr_count($bufferText, '`'); if ($lastChar === '"' && $doubleQuoteCount % 2 === 1) { return true; } if ($lastChar === "'" && $singleQuoteCount % 2 === 1) { return true; } if ($lastChar === '`' && $backtickCount % 2 === 1) { return true; } } return false; } /** * Get the number of spaces needed to reach the next tab stop. / public function spacesToNextTabStop(int $column): int { return self::INDENT_WIDTH - ($column % self::INDENT_WIDTH); } /* * Get the number of spaces to remove to reach the previous tab stop. / public function spacesToPreviousTabStop(int $spaces): int { $remainder = $spaces % self::INDENT_WIDTH; return $remainder === 0 ? self::INDENT_WIDTH : $remainder; } /* * Extract leading whitespace from a line. / private function getLineIndentation(string $line): string { if (\preg_match('/^(\s+)/', $line, $matches)) { return $matches[1]; } return ''; } /* * Check whether a line ends with a control structure (if, for, while, etc.). / private function endsWithControlStructure(string $line): bool { return (bool) \preg_match('/\b(if\|for\|foreach\|while\|switch\|else\|elseif\|do)\s$[^)]$\s$/', $line); } }

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