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+// @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.
+ *
+ * @internal
+ */
+export function dedentBlockStringValue(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.
+ const commonIndent = getBlockStringIndentation(rawString);
+
+ if (commonIndent !== 0) {
+ for (let i = 1; i < lines.length; i++) {
+ lines[i] = lines[i].slice(commonIndent);
+ }
+ }
+
+ // Remove leading and trailing blank lines.
+ let startLine = 0;
+ while (startLine < lines.length && isBlank(lines[startLine])) {
+ ++startLine;
+ }
+
+ let endLine = lines.length;
+ while (endLine > startLine && isBlank(lines[endLine - 1])) {
+ --endLine;
+ }
+
+ // Return a string of the lines joined with U+000A.
+ return lines.slice(startLine, endLine).join('\n');
+}
+
+function isBlank(str: string): boolean {
+ for (let i = 0; i < str.length; ++i) {
+ if (str[i] !== ' ' && str[i] !== '\t') {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+/**
+ * @internal
+ */
+export function getBlockStringIndentation(value: string): number {
+ let isFirstLine = true;
+ let isEmptyLine = true;
+ let indent = 0;
+ let commonIndent = null;
+
+ for (let i = 0; i < value.length; ++i) {
+ switch (value.charCodeAt(i)) {
+ case 13: // \r
+ if (value.charCodeAt(i + 1) === 10) {
+ ++i; // skip \r\n as one symbol
+ }
+ // falls through
+ case 10: // \n
+ isFirstLine = false;
+ isEmptyLine = true;
+ indent = 0;
+ break;
+ case 9: // \t
+ case 32: // <space>
+ ++indent;
+ break;
+ default:
+ if (
+ isEmptyLine &&
+ !isFirstLine &&
+ (commonIndent === null || indent < commonIndent)
+ ) {
+ commonIndent = indent;
+ }
+ isEmptyLine = false;
+ }
+ }
+
+ return commonIndent ?? 0;
+}
+
+/**
+ * Print a block string in the indented block form by adding a leading and
+ * trailing blank line. However, if a block string starts with whitespace and is
+ * a single-line, adding a leading blank line would strip that whitespace.
+ *
+ * @internal
+ */
+export function printBlockString(
+ value: string,
+ indentation: string = '',
+ preferMultipleLines: boolean = false,
+): string {
+ const isSingleLine = value.indexOf('\n') === -1;
+ const hasLeadingSpace = value[0] === ' ' || value[0] === '\t';
+ const hasTrailingQuote = value[value.length - 1] === '"';
+ const hasTrailingSlash = value[value.length - 1] === '\\';
+ const printAsMultipleLines =
+ !isSingleLine ||
+ hasTrailingQuote ||
+ hasTrailingSlash ||
+ preferMultipleLines;
+
+ let result = '';
+ // Format a multi-line block quote to account for leading space.
+ if (printAsMultipleLines && !(isSingleLine && hasLeadingSpace)) {
+ result += '\n' + indentation;
+ }
+ result += indentation ? value.replace(/\n/g, '\n' + indentation) : value;
+ if (printAsMultipleLines) {
+ result += '\n';
+ }
+
+ return '"""' + result.replace(/"""/g, '\\"""') + '"""';
+}