From 8c8f6234f7278a9376ddc00aafd1ce2a18876a61 Mon Sep 17 00:00:00 2001
From: Nikolay Makhonin <nikolay.makhonin@gmail.com>
Date: Sat, 3 Oct 2020 11:47:04 +0300
Subject: [PATCH] Added preprocess option:

settings: {
	'svelte3/preprocess': text => {
		return text.replace(/custom-style-tag/g, 'style')
	},
},
---
 src/preprocess.js                     | 3 +++
 src/processor_options.js              | 1 +
 test/samples/preprocess/.eslintrc.js  | 7 +++++++
 test/samples/preprocess/Input.svelte  | 7 +++++++
 test/samples/preprocess/expected.json | 1 +
 5 files changed, 19 insertions(+)
 create mode 100644 test/samples/preprocess/.eslintrc.js
 create mode 100644 test/samples/preprocess/Input.svelte
 create mode 100644 test/samples/preprocess/expected.json

diff --git a/src/preprocess.js b/src/preprocess.js
index 784bdd7..64ebd74 100644
--- a/src/preprocess.js
+++ b/src/preprocess.js
@@ -25,6 +25,9 @@ const find_contextual_names = (compiler, node) => {
 // extract scripts to lint from component definition
 export const preprocess = text => {
 	const compiler = processor_options.custom_compiler || default_compiler || (default_compiler = require('svelte/compiler'));
+	if (processor_options.preprocess) {
+		text = processor_options.preprocess(text)
+	}
 	if (processor_options.ignore_styles) {
 		// wipe the appropriate <style> tags in the file
 		text = text.replace(/<style(\s[^]*?)?>[^]*?<\/style>/gi, (match, attributes = '') => {
diff --git a/src/processor_options.js b/src/processor_options.js
index 83d59a1..b846ad1 100644
--- a/src/processor_options.js
+++ b/src/processor_options.js
@@ -12,6 +12,7 @@ const { verify } = Linter.prototype;
 Linter.prototype.verify = function(code, config, options) {
 	// fetch settings
 	const settings = config && (typeof config.extractConfig === 'function' ? config.extractConfig(options.filename) : config).settings || {};
+	processor_options.preprocess = settings['svelte3/preprocess'];
 	processor_options.custom_compiler = settings['svelte3/compiler'];
 	processor_options.ignore_warnings = settings['svelte3/ignore-warnings'];
 	processor_options.ignore_styles = settings['svelte3/ignore-styles'];
diff --git a/test/samples/preprocess/.eslintrc.js b/test/samples/preprocess/.eslintrc.js
new file mode 100644
index 0000000..3380a13
--- /dev/null
+++ b/test/samples/preprocess/.eslintrc.js
@@ -0,0 +1,7 @@
+module.exports = {
+	settings: {
+		'svelte3/preprocess': text => {
+			return text.replace(/custom-style-tag/g, 'style')
+		},
+	},
+};
diff --git a/test/samples/preprocess/Input.svelte b/test/samples/preprocess/Input.svelte
new file mode 100644
index 0000000..0d1b90a
--- /dev/null
+++ b/test/samples/preprocess/Input.svelte
@@ -0,0 +1,7 @@
+<div></div>
+
+<custom-style-tag>
+	div {
+		background: black;
+	}
+</custom-style-tag>
diff --git a/test/samples/preprocess/expected.json b/test/samples/preprocess/expected.json
new file mode 100644
index 0000000..fe51488
--- /dev/null
+++ b/test/samples/preprocess/expected.json
@@ -0,0 +1 @@
+[]