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103 lines
2.7 KiB
JavaScript
103 lines
2.7 KiB
JavaScript
/**
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* Produces the value of a block string from its parsed raw value, similar to
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* CoffeeScript's block string, Python's docstring trim or Ruby's strip_heredoc.
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*
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* This implements the GraphQL spec's BlockStringValue() static algorithm.
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*
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* @internal
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*/
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export function dedentBlockStringValue(rawString) {
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// Expand a block string's raw value into independent lines.
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var lines = rawString.split(/\r\n|[\n\r]/g); // Remove common indentation from all lines but first.
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var commonIndent = getBlockStringIndentation(lines);
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if (commonIndent !== 0) {
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for (var i = 1; i < lines.length; i++) {
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lines[i] = lines[i].slice(commonIndent);
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}
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} // Remove leading and trailing blank lines.
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while (lines.length > 0 && isBlank(lines[0])) {
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lines.shift();
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}
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while (lines.length > 0 && isBlank(lines[lines.length - 1])) {
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lines.pop();
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} // Return a string of the lines joined with U+000A.
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return lines.join('\n');
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}
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/**
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* @internal
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*/
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export function getBlockStringIndentation(lines) {
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var commonIndent = null;
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for (var i = 1; i < lines.length; i++) {
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var line = lines[i];
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var indent = leadingWhitespace(line);
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if (indent === line.length) {
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continue; // skip empty lines
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}
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if (commonIndent === null || indent < commonIndent) {
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commonIndent = indent;
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if (commonIndent === 0) {
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break;
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}
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}
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}
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return commonIndent === null ? 0 : commonIndent;
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}
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function leadingWhitespace(str) {
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var i = 0;
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while (i < str.length && (str[i] === ' ' || str[i] === '\t')) {
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i++;
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}
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return i;
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}
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function isBlank(str) {
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return leadingWhitespace(str) === str.length;
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}
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/**
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* Print a block string in the indented block form by adding a leading and
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* trailing blank line. However, if a block string starts with whitespace and is
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* a single-line, adding a leading blank line would strip that whitespace.
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*
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* @internal
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*/
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export function printBlockString(value) {
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var indentation = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '';
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var preferMultipleLines = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
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var isSingleLine = value.indexOf('\n') === -1;
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var hasLeadingSpace = value[0] === ' ' || value[0] === '\t';
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var hasTrailingQuote = value[value.length - 1] === '"';
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var printAsMultipleLines = !isSingleLine || hasTrailingQuote || preferMultipleLines;
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var result = ''; // Format a multi-line block quote to account for leading space.
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if (printAsMultipleLines && !(isSingleLine && hasLeadingSpace)) {
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result += '\n' + indentation;
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}
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result += indentation ? value.replace(/\n/g, '\n' + indentation) : value;
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if (printAsMultipleLines) {
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result += '\n';
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}
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return '"""' + result.replace(/"""/g, '\\"""') + '"""';
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}
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