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server/node_modules/graphql/language/blockStringValue.js.flow

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+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict
+ */
+
+/**
+ * Produces the value of a block string from its parsed raw value, similar to
+ * Coffeescript's block string, Python's docstring trim or Ruby's strip_heredoc.
+ *
+ * This implements the GraphQL spec's BlockStringValue() static algorithm.
+ */
+export default function blockStringValue(rawString: string): string {
+  // Expand a block string's raw value into independent lines.
+  const lines = rawString.split(/\r\n|[\n\r]/g);
+
+  // Remove common indentation from all lines but first.
+  let commonIndent = null;
+  for (let i = 1; i < lines.length; i++) {
+    const line = lines[i];
+    const indent = leadingWhitespace(line);
+    if (
+      indent < line.length &&
+      (commonIndent === null || indent < commonIndent)
+    ) {
+      commonIndent = indent;
+      if (commonIndent === 0) {
+        break;
+      }
+    }
+  }
+
+  if (commonIndent) {
+    for (let i = 1; i < lines.length; i++) {
+      lines[i] = lines[i].slice(commonIndent);
+    }
+  }
+
+  // Remove leading and trailing blank lines.
+  while (lines.length > 0 && isBlank(lines[0])) {
+    lines.shift();
+  }
+  while (lines.length > 0 && isBlank(lines[lines.length - 1])) {
+    lines.pop();
+  }
+
+  // Return a string of the lines joined with U+000A.
+  return lines.join('\n');
+}
+
+function leadingWhitespace(str) {
+  let i = 0;
+  while (i < str.length && (str[i] === ' ' || str[i] === '\t')) {
+    i++;
+  }
+  return i;
+}
+
+function isBlank(str) {
+  return leadingWhitespace(str) === str.length;
+}