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/**
* 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) {
// Expand a block string's raw value into independent lines.
var lines = rawString.split(/\r\n|[\n\r]/g); // Remove common indentation from all lines but first.
var commonIndent = getBlockStringIndentation(rawString);
if (commonIndent !== 0) {
for (var i = 1; i < lines.length; i++) {
lines[i] = lines[i].slice(commonIndent);
}
} // Remove leading and trailing blank lines.
var startLine = 0;
while (startLine < lines.length && isBlank(lines[startLine])) {
++startLine;
}
var 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) {
for (var i = 0; i < str.length; ++i) {
if (str[i] !== ' ' && str[i] !== '\t') {
return false;
}
}
return true;
}
/**
* @internal
*/
export function getBlockStringIndentation(value) {
var _commonIndent;
var isFirstLine = true;
var isEmptyLine = true;
var indent = 0;
var commonIndent = null;
for (var 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 = commonIndent) !== null && _commonIndent !== void 0 ? _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) {
var indentation = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '';
var preferMultipleLines = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
var isSingleLine = value.indexOf('\n') === -1;
var hasLeadingSpace = value[0] === ' ' || value[0] === '\t';
var hasTrailingQuote = value[value.length - 1] === '"';
var hasTrailingSlash = value[value.length - 1] === '\\';
var printAsMultipleLines = !isSingleLine || hasTrailingQuote || hasTrailingSlash || preferMultipleLines;
var 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, '\\"""') + '"""';
}
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