Merge remote-tracking branch 'origin/master'

Author: g105b

src/CssAttributeTokenBuilder.php

@@ -0,0 +1,113 @@
+<?php
+
+namespace Gt\CssXPath;
+
+class CssAttributeTokenBuilder {
+	/**
+	 * @return array<string, mixed>
+	 */
+	public function build(string $content, ?callable $transform):array {
+		$operatorData = $this->extractOperator($content);
+		$token = $this->buildMatchPayload(
+			"attribute",
+			$operatorData["name"],
+			$transform
+		);
+
+		if($operatorData["operator"] === null) {
+			return $token;
+		}
+
+		$token["detail"] = [
+			$this->buildMatchPayload(
+				"attribute_equals",
+				$operatorData["operator"],
+				$transform
+			),
+			$this->buildMatchPayload(
+				"attribute_value",
+				$operatorData["value"],
+				$transform
+			),
+		];
+		return $token;
+	}
+
+	/**
+	 * @return array{name: string, operator: string|null, value: string}
+	 */
+	private function extractOperator(string $content):array {
+		$operators = ["~=", "$=", "|=", "^=", "*=", "="];
+		$quote = null;
+		$length = strlen($content);
+
+		for($index = 0; $index < $length; $index++) {
+			$char = $content[$index];
+			if($quote !== null) {
+				if($char === $quote) {
+					$quote = null;
+				}
+
+				continue;
+			}
+
+			if($char === "'" || $char === '"') {
+				$quote = $char;
+				continue;
+			}
+
+			$matchedOperator = $this->matchOperator(
+				$content,
+				$index,
+				$operators
+			);
+			if($matchedOperator === null) {
+				continue;
+			}
+
+			return [
+				"name" => trim(substr($content, 0, $index)),
+				"operator" => $matchedOperator,
+				"value" => trim(
+					substr($content, $index + strlen($matchedOperator))
+				),
+			];
+		}
+
+		return [
+			"name" => trim($content),
+			"operator" => null,
+			"value" => "",
+		];
+	}
+
+	/**
+	 * @param array<int, string> $operators
+	 */
+	private function matchOperator(
+		string $content,
+		int $index,
+		array $operators
+	):?string {
+		foreach($operators as $operator) {
+			if(substr($content, $index, strlen($operator)) === $operator) {
+				return $operator;
+			}
+		}
+
+		return null;
+	}
+
+	/** @return array<string, string> */
+	private function buildMatchPayload(
+		string $groupKey,
+		string $match,
+		?callable $transform
+	):array {
+		if($transform) {
+			return $transform($groupKey, $match);
+		}
+
+		return ["type" => $groupKey, "content" => $match];
+	}
+}