195 lines
7.1 KiB
JavaScript
195 lines
7.1 KiB
JavaScript
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import { Scalar } from '../nodes/Scalar.js';
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function resolveBlockScalar(scalar, strict, onError) {
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const start = scalar.offset;
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const header = parseBlockScalarHeader(scalar, strict, onError);
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if (!header)
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return { value: '', type: null, comment: '', range: [start, start, start] };
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const type = header.mode === '>' ? Scalar.BLOCK_FOLDED : Scalar.BLOCK_LITERAL;
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const lines = scalar.source ? splitLines(scalar.source) : [];
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// determine the end of content & start of chomping
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let chompStart = lines.length;
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for (let i = lines.length - 1; i >= 0; --i) {
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const content = lines[i][1];
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if (content === '' || content === '\r')
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chompStart = i;
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else
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break;
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}
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// shortcut for empty contents
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if (chompStart === 0) {
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const value = header.chomp === '+' && lines.length > 0
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? '\n'.repeat(Math.max(1, lines.length - 1))
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: '';
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let end = start + header.length;
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if (scalar.source)
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end += scalar.source.length;
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return { value, type, comment: header.comment, range: [start, end, end] };
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}
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// find the indentation level to trim from start
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let trimIndent = scalar.indent + header.indent;
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let offset = scalar.offset + header.length;
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let contentStart = 0;
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for (let i = 0; i < chompStart; ++i) {
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const [indent, content] = lines[i];
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if (content === '' || content === '\r') {
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if (header.indent === 0 && indent.length > trimIndent)
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trimIndent = indent.length;
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}
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else {
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if (indent.length < trimIndent) {
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const message = 'Block scalars with more-indented leading empty lines must use an explicit indentation indicator';
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onError(offset + indent.length, 'MISSING_CHAR', message);
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}
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if (header.indent === 0)
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trimIndent = indent.length;
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contentStart = i;
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break;
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}
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offset += indent.length + content.length + 1;
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}
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// include trailing more-indented empty lines in content
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for (let i = lines.length - 1; i >= chompStart; --i) {
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if (lines[i][0].length > trimIndent)
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chompStart = i + 1;
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}
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let value = '';
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let sep = '';
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let prevMoreIndented = false;
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// leading whitespace is kept intact
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for (let i = 0; i < contentStart; ++i)
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value += lines[i][0].slice(trimIndent) + '\n';
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for (let i = contentStart; i < chompStart; ++i) {
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let [indent, content] = lines[i];
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offset += indent.length + content.length + 1;
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const crlf = content[content.length - 1] === '\r';
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if (crlf)
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content = content.slice(0, -1);
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/* istanbul ignore if already caught in lexer */
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if (content && indent.length < trimIndent) {
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const src = header.indent
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? 'explicit indentation indicator'
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: 'first line';
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const message = `Block scalar lines must not be less indented than their ${src}`;
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onError(offset - content.length - (crlf ? 2 : 1), 'BAD_INDENT', message);
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indent = '';
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}
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if (type === Scalar.BLOCK_LITERAL) {
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value += sep + indent.slice(trimIndent) + content;
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sep = '\n';
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}
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else if (indent.length > trimIndent || content[0] === '\t') {
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// more-indented content within a folded block
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if (sep === ' ')
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sep = '\n';
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else if (!prevMoreIndented && sep === '\n')
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sep = '\n\n';
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value += sep + indent.slice(trimIndent) + content;
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sep = '\n';
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prevMoreIndented = true;
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}
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else if (content === '') {
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// empty line
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if (sep === '\n')
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value += '\n';
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else
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sep = '\n';
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}
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else {
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value += sep + content;
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sep = ' ';
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prevMoreIndented = false;
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}
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}
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switch (header.chomp) {
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case '-':
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break;
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case '+':
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for (let i = chompStart; i < lines.length; ++i)
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value += '\n' + lines[i][0].slice(trimIndent);
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if (value[value.length - 1] !== '\n')
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value += '\n';
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break;
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default:
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value += '\n';
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}
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const end = start + header.length + scalar.source.length;
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return { value, type, comment: header.comment, range: [start, end, end] };
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}
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function parseBlockScalarHeader({ offset, props }, strict, onError) {
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/* istanbul ignore if should not happen */
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if (props[0].type !== 'block-scalar-header') {
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onError(props[0], 'IMPOSSIBLE', 'Block scalar header not found');
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return null;
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}
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const { source } = props[0];
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const mode = source[0];
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let indent = 0;
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let chomp = '';
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let error = -1;
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for (let i = 1; i < source.length; ++i) {
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const ch = source[i];
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if (!chomp && (ch === '-' || ch === '+'))
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chomp = ch;
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else {
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const n = Number(ch);
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if (!indent && n)
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indent = n;
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else if (error === -1)
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error = offset + i;
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}
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}
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if (error !== -1)
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onError(error, 'UNEXPECTED_TOKEN', `Block scalar header includes extra characters: ${source}`);
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let hasSpace = false;
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let comment = '';
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let length = source.length;
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for (let i = 1; i < props.length; ++i) {
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const token = props[i];
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switch (token.type) {
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case 'space':
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hasSpace = true;
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// fallthrough
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case 'newline':
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length += token.source.length;
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break;
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case 'comment':
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if (strict && !hasSpace) {
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const message = 'Comments must be separated from other tokens by white space characters';
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onError(token, 'MISSING_CHAR', message);
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}
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length += token.source.length;
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comment = token.source.substring(1);
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break;
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case 'error':
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onError(token, 'UNEXPECTED_TOKEN', token.message);
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length += token.source.length;
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break;
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/* istanbul ignore next should not happen */
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default: {
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const message = `Unexpected token in block scalar header: ${token.type}`;
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onError(token, 'UNEXPECTED_TOKEN', message);
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const ts = token.source;
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if (ts && typeof ts === 'string')
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length += ts.length;
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}
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}
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}
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return { mode, indent, chomp, comment, length };
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}
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/** @returns Array of lines split up as `[indent, content]` */
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function splitLines(source) {
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const split = source.split(/\n( *)/);
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const first = split[0];
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const m = first.match(/^( *)/);
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const line0 = m?.[1]
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? [m[1], first.slice(m[1].length)]
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: ['', first];
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const lines = [line0];
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for (let i = 1; i < split.length; i += 2)
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lines.push([split[i], split[i + 1]]);
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return lines;
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}
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export { resolveBlockScalar };
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