cdk8s
Version:
This is the core library of Cloud Development Kit (CDK) for Kubernetes (cdk8s). cdk8s apps synthesize into standard Kubernetes manifests which can be applied to any Kubernetes cluster.
199 lines (196 loc) • 7.45 kB
JavaScript
import { Scalar } from '../nodes/Scalar.js';
function resolveBlockScalar(ctx, scalar, onError) {
const start = scalar.offset;
const header = parseBlockScalarHeader(scalar, ctx.options.strict, onError);
if (!header)
return { value: '', type: null, comment: '', range: [start, start, start] };
const type = header.mode === '>' ? Scalar.BLOCK_FOLDED : Scalar.BLOCK_LITERAL;
const lines = scalar.source ? splitLines(scalar.source) : [];
// determine the end of content & start of chomping
let chompStart = lines.length;
for (let i = lines.length - 1; i >= 0; --i) {
const content = lines[i][1];
if (content === '' || content === '\r')
chompStart = i;
else
break;
}
// shortcut for empty contents
if (chompStart === 0) {
const value = header.chomp === '+' && lines.length > 0
? '\n'.repeat(Math.max(1, lines.length - 1))
: '';
let end = start + header.length;
if (scalar.source)
end += scalar.source.length;
return { value, type, comment: header.comment, range: [start, end, end] };
}
// find the indentation level to trim from start
let trimIndent = scalar.indent + header.indent;
let offset = scalar.offset + header.length;
let contentStart = 0;
for (let i = 0; i < chompStart; ++i) {
const [indent, content] = lines[i];
if (content === '' || content === '\r') {
if (header.indent === 0 && indent.length > trimIndent)
trimIndent = indent.length;
}
else {
if (indent.length < trimIndent) {
const message = 'Block scalars with more-indented leading empty lines must use an explicit indentation indicator';
onError(offset + indent.length, 'MISSING_CHAR', message);
}
if (header.indent === 0)
trimIndent = indent.length;
contentStart = i;
if (trimIndent === 0 && !ctx.atRoot) {
const message = 'Block scalar values in collections must be indented';
onError(offset, 'BAD_INDENT', message);
}
break;
}
offset += indent.length + content.length + 1;
}
// include trailing more-indented empty lines in content
for (let i = lines.length - 1; i >= chompStart; --i) {
if (lines[i][0].length > trimIndent)
chompStart = i + 1;
}
let value = '';
let sep = '';
let prevMoreIndented = false;
// leading whitespace is kept intact
for (let i = 0; i < contentStart; ++i)
value += lines[i][0].slice(trimIndent) + '\n';
for (let i = contentStart; i < chompStart; ++i) {
let [indent, content] = lines[i];
offset += indent.length + content.length + 1;
const crlf = content[content.length - 1] === '\r';
if (crlf)
content = content.slice(0, -1);
/* istanbul ignore if already caught in lexer */
if (content && indent.length < trimIndent) {
const src = header.indent
? 'explicit indentation indicator'
: 'first line';
const message = `Block scalar lines must not be less indented than their ${src}`;
onError(offset - content.length - (crlf ? 2 : 1), 'BAD_INDENT', message);
indent = '';
}
if (type === Scalar.BLOCK_LITERAL) {
value += sep + indent.slice(trimIndent) + content;
sep = '\n';
}
else if (indent.length > trimIndent || content[0] === '\t') {
// more-indented content within a folded block
if (sep === ' ')
sep = '\n';
else if (!prevMoreIndented && sep === '\n')
sep = '\n\n';
value += sep + indent.slice(trimIndent) + content;
sep = '\n';
prevMoreIndented = true;
}
else if (content === '') {
// empty line
if (sep === '\n')
value += '\n';
else
sep = '\n';
}
else {
value += sep + content;
sep = ' ';
prevMoreIndented = false;
}
}
switch (header.chomp) {
case '-':
break;
case '+':
for (let i = chompStart; i < lines.length; ++i)
value += '\n' + lines[i][0].slice(trimIndent);
if (value[value.length - 1] !== '\n')
value += '\n';
break;
default:
value += '\n';
}
const end = start + header.length + scalar.source.length;
return { value, type, comment: header.comment, range: [start, end, end] };
}
function parseBlockScalarHeader({ offset, props }, strict, onError) {
/* istanbul ignore if should not happen */
if (props[0].type !== 'block-scalar-header') {
onError(props[0], 'IMPOSSIBLE', 'Block scalar header not found');
return null;
}
const { source } = props[0];
const mode = source[0];
let indent = 0;
let chomp = '';
let error = -1;
for (let i = 1; i < source.length; ++i) {
const ch = source[i];
if (!chomp && (ch === '-' || ch === '+'))
chomp = ch;
else {
const n = Number(ch);
if (!indent && n)
indent = n;
else if (error === -1)
error = offset + i;
}
}
if (error !== -1)
onError(error, 'UNEXPECTED_TOKEN', `Block scalar header includes extra characters: ${source}`);
let hasSpace = false;
let comment = '';
let length = source.length;
for (let i = 1; i < props.length; ++i) {
const token = props[i];
switch (token.type) {
case 'space':
hasSpace = true;
// fallthrough
case 'newline':
length += token.source.length;
break;
case 'comment':
if (strict && !hasSpace) {
const message = 'Comments must be separated from other tokens by white space characters';
onError(token, 'MISSING_CHAR', message);
}
length += token.source.length;
comment = token.source.substring(1);
break;
case 'error':
onError(token, 'UNEXPECTED_TOKEN', token.message);
length += token.source.length;
break;
/* istanbul ignore next should not happen */
default: {
const message = `Unexpected token in block scalar header: ${token.type}`;
onError(token, 'UNEXPECTED_TOKEN', message);
const ts = token.source;
if (ts && typeof ts === 'string')
length += ts.length;
}
}
}
return { mode, indent, chomp, comment, length };
}
/** @returns Array of lines split up as `[indent, content]` */
function splitLines(source) {
const split = source.split(/\n( *)/);
const first = split[0];
const m = first.match(/^( *)/);
const line0 = m?.[1]
? [m[1], first.slice(m[1].length)]
: ['', first];
const lines = [line0];
for (let i = 1; i < split.length; i += 2)
lines.push([split[i], split[i + 1]]);
return lines;
}
export { resolveBlockScalar };