diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -150,6 +150,8 @@
     'PhutilDocblockParserTestCase' => 'parser/__tests__/PhutilDocblockParserTestCase.php',
     'PhutilEditDistanceMatrix' => 'utils/PhutilEditDistanceMatrix.php',
     'PhutilEditDistanceMatrixTestCase' => 'utils/__tests__/PhutilEditDistanceMatrixTestCase.php',
+    'PhutilEditorConfig' => 'parser/PhutilEditorConfig.php',
+    'PhutilEditorConfigTestCase' => 'parser/__tests__/PhutilEditorConfigTestCase.php',
     'PhutilEmailAddress' => 'parser/PhutilEmailAddress.php',
     'PhutilEmailAddressTestCase' => 'parser/__tests__/PhutilEmailAddressTestCase.php',
     'PhutilEmptyAuthAdapter' => 'auth/PhutilEmptyAuthAdapter.php',
@@ -587,6 +589,7 @@
     'PhutilDisqusAuthAdapter' => 'PhutilOAuthAuthAdapter',
     'PhutilDocblockParserTestCase' => 'PhutilTestCase',
     'PhutilEditDistanceMatrixTestCase' => 'PhutilTestCase',
+    'PhutilEditorConfigTestCase' => 'PhutilTestCase',
     'PhutilEmailAddressTestCase' => 'PhutilTestCase',
     'PhutilEmptyAuthAdapter' => 'PhutilAuthAdapter',
     'PhutilErrorHandlerTestCase' => 'PhutilTestCase',
diff --git a/src/parser/PhutilEditorConfig.php b/src/parser/PhutilEditorConfig.php
new file mode 100644
--- /dev/null
+++ b/src/parser/PhutilEditorConfig.php
@@ -0,0 +1,131 @@
+<?php
+
+/**
+ * Utilities for parsing [[http://editorconfig.org/ | EditorConfig]] files.
+ */
+final class PhutilEditorConfig {
+
+  private $root;
+
+  private static $knownProperties = array(
+    'charset' => array('latin1', 'utf-8', 'utf-8-bom', 'utf-16be', 'utf-16le'),
+    'end_of_line' => array('lf', 'cr', 'lfcr'),
+    'indent_size' => 'int|string',
+    'indent_style' => array('space', 'tab'),
+    'insert_final_newline' => 'bool',
+    'tab_width' => 'int',
+    'trim_trailing_whitespace' => 'bool',
+  );
+
+  /**
+   * Constructor.
+   *
+   * @param string  The root directory.
+   */
+  public function __construct($root) {
+    $this->root = $root;
+  }
+
+  public function getConfig($path, $key) {
+    $configs = $this->getConfigsAffectingPath($path);
+
+    switch ($key) {
+      case 'indent_size':
+        if (idx($configs, 'indent_size') === null &&
+            idx($configs, 'indent_style') === 'tab') {
+          return 'tab';
+        } else if (idx($configs, 'indent_size') == 'tab' &&
+                   idx($configs, 'tab_size') !== null) {
+          return idx($configs, 'tab_size');
+        }
+        break;
+
+      case 'tab_width':
+        if (idx($configs, 'indent_size') !== null &&
+            idx($configs, 'tab_width') === null &&
+            idx($configs, 'indent_size') !== 'tab') {
+          return idx($configs, 'indent_size');
+        }
+        break;
+    }
+
+    return idx($configs, $key);
+  }
+
+  private function getConfigsAffectingPath($path) {
+    $editorconfigs = $this->getEditorConfigs($path);
+    $matches = array();
+
+    foreach ($editorconfigs as $editorconfig) {
+      list($path_prefix, $config) = $editorconfig;
+      $value = null;
+
+      foreach ($config as $glob => $options) {
+        if (!$glob) {
+          continue;
+        }
+
+        switch (strpos($glob, '/')) {
+          case false:
+            $glob = '**/'.$glob;
+            break;
+
+          case 0:
+            $glob = substr($glob, 1);
+            break;
+        }
+
+        $glob = $path_prefix.'/'.$glob;
+        $regex = phutil_glob_to_regex($glob);
+
+        if (!preg_match($regex, $path)) {
+          continue;
+        }
+
+        foreach ($options as $option => $value) {
+          $option = strtolower($option);
+
+          if (idx(self::$knownProperties, $option) === null) {
+            continue;
+          }
+
+          // TODO: What if it really is `null`?
+          $value = strtolower($value);
+          if (json_decode($value, true) !== null) {
+            $value = json_decode($value, true);
+          }
+          $matches[$option] = $value;
+        }
+      }
+    }
+
+    return $matches;
+  }
+
+  /**
+   * Returns the EditorConfig files which affect the specified path.
+   *
+   * Find and parse all `.editorconfig` files between the specified path and
+   * the root directory.
+   *
+   * return list<pair<string, dict>>
+   */
+  private function getEditorConfigs($path) {
+    $configs = array();
+
+    do {
+      $path = dirname($path);
+      $file = $path.'/.editorconfig';
+
+      if (!Filesystem::pathExists($file)) {
+        continue;
+      }
+
+      $config = phutil_ini_decode(Filesystem::readFile($file));
+      array_unshift($configs, array($path, $config));
+    } while ($path != $this->root);
+
+    return $configs;
+  }
+
+}
diff --git a/src/parser/__tests__/PhutilEditorConfigTestCase.php b/src/parser/__tests__/PhutilEditorConfigTestCase.php
new file mode 100644
--- /dev/null
+++ b/src/parser/__tests__/PhutilEditorConfigTestCase.php
@@ -0,0 +1,35 @@
+<?php
+
+final class PhutilEditorConfigTestCase extends PhutilTestCase {
+
+  public function testGetPaths() {
+    $parser = new PhutilEditorConfig(dirname(phutil_get_library_root()));
+
+    $tests = array(
+      'file.txt' => array(
+        'indent_style' => 'tab',
+        'indent_size' => 4,
+        'charset' => 'utf-8',
+        'trim_trailing_whitespace' => false,
+        'insert_final_newline' => false,
+      ),
+      'indent.txt' => array(
+        'indent_style' => 'space',
+        'indent_size' => 2,
+      ),
+    );
+
+    foreach ($tests as $path => $config) {
+      foreach ($config as $key => $value) {
+        $this->assertEqual(
+          $value,
+          $parser->getConfig($this->getTestFile($path), $key));
+      }
+    }
+  }
+
+  private function getTestFile($path) {
+    return dirname(__FILE__).'/editorconfig/'.$path;
+  }
+
+}
diff --git a/src/parser/__tests__/editorconfig/.editorconfig b/src/parser/__tests__/editorconfig/.editorconfig
new file mode 100644
--- /dev/null
+++ b/src/parser/__tests__/editorconfig/.editorconfig
@@ -0,0 +1,10 @@
+[*]
+indent_style = tab
+indent_size = 4
+charset = utf-8
+trim_trailing_whitespace = false
+insert_final_newline = false
+
+[indent.txt]
+indent_style = space
+indent_size = 2