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import { Scalar } from '../nodes/Scalar.js';
import { resolveEnd } from './resolve-end.js';
function resolveFlowScalar(scalar, strict, onError) {
const { offset, type, source, end } = scalar;
let _type;
let value;
const _onError = (rel, code, msg) => onError(offset + rel, code, msg);
switch (type) {
case 'scalar':
_type = Scalar.PLAIN;
value = plainValue(source, _onError);
break;
case 'single-quoted-scalar':
_type = Scalar.QUOTE_SINGLE;
value = singleQuotedValue(source, _onError);
break;
case 'double-quoted-scalar':
_type = Scalar.QUOTE_DOUBLE;
value = doubleQuotedValue(source, _onError);
break;
/* istanbul ignore next should not happen */
default:
onError(scalar, 'UNEXPECTED_TOKEN', `Expected a flow scalar value, but found: ${type}`);
return {
value: '',
type: null,
comment: '',
range: [offset, offset + source.length, offset + source.length]
};
}
const valueEnd = offset + source.length;
const re = resolveEnd(end, valueEnd, strict, onError);
return {
value,
type: _type,
comment: re.comment,
range: [offset, valueEnd, re.offset]
};
}
function plainValue(source, onError) {
let badChar = '';
switch (source[0]) {
/* istanbul ignore next should not happen */
case '\t':
badChar = 'a tab character';
break;
case ',':
badChar = 'flow indicator character ,';
break;
case '%':
badChar = 'directive indicator character %';
break;
case '|':
case '>': {
badChar = `block scalar indicator ${source[0]}`;
break;
}
case '@':
case '`': {
badChar = `reserved character ${source[0]}`;
break;
}
}
if (badChar)
onError(0, 'BAD_SCALAR_START', `Plain value cannot start with ${badChar}`);
return foldLines(source);
}
function singleQuotedValue(source, onError) {
if (source[source.length - 1] !== "'" || source.length === 1)
onError(source.length, 'MISSING_CHAR', "Missing closing 'quote");
return foldLines(source.slice(1, -1)).replace(/''/g, "'");
}
function foldLines(source) {
var _a;
/**
* The negative lookbehind here and in the `re` RegExp is to
* prevent causing a polynomial search time in certain cases.
*
* The try-catch is for Safari, which doesn't support this yet:
* https://caniuse.com/js-regexp-lookbehind
*/
let first, line;
try {
first = new RegExp('(.*?)(?<![ \t])[ \t]*\r?\n', 'sy');
line = new RegExp('[ \t]*(.*?)(?:(?<![ \t])[ \t]*)?\r?\n', 'sy');
}
catch (_) {
first = /(.*?)[ \t]*\r?\n/sy;
line = /[ \t]*(.*?)[ \t]*\r?\n/sy;
}
let match = first.exec(source);
if (!match)
return source;
let res = match[1];
let sep = ' ';
let pos = first.lastIndex;
line.lastIndex = pos;
while ((match = line.exec(source))) {
if (match[1] === '') {
if (sep === '\n')
res += sep;
else
sep = '\n';
}
else {
res += sep + match[1];
sep = ' ';
}
pos = line.lastIndex;
}
const last = /[ \t]*(.*)/sy;
last.lastIndex = pos;
match = last.exec(source);
return res + sep + ((_a = match === null || match === void 0 ? void 0 : match[1]) !== null && _a !== void 0 ? _a : '');
}
function doubleQuotedValue(source, onError) {
let res = '';
for (let i = 1; i < source.length - 1; ++i) {
const ch = source[i];
if (ch === '\r' && source[i + 1] === '\n')
continue;
if (ch === '\n') {
const { fold, offset } = foldNewline(source, i);
res += fold;
i = offset;
}
else if (ch === '\\') {
let next = source[++i];
const cc = escapeCodes[next];
if (cc)
res += cc;
else if (next === '\n') {
// skip escaped newlines, but still trim the following line
next = source[i + 1];
while (next === ' ' || next === '\t')
next = source[++i + 1];
}
else if (next === '\r' && source[i + 1] === '\n') {
// skip escaped CRLF newlines, but still trim the following line
next = source[++i + 1];
while (next === ' ' || next === '\t')
next = source[++i + 1];
}
else if (next === 'x' || next === 'u' || next === 'U') {
const length = { x: 2, u: 4, U: 8 }[next];
res += parseCharCode(source, i + 1, length, onError);
i += length;
}
else {
const raw = source.substr(i - 1, 2);
onError(i - 1, 'BAD_DQ_ESCAPE', `Invalid escape sequence ${raw}`);
res += raw;
}
}
else if (ch === ' ' || ch === '\t') {
// trim trailing whitespace
const wsStart = i;
let next = source[i + 1];
while (next === ' ' || next === '\t')
next = source[++i + 1];
if (next !== '\n' && !(next === '\r' && source[i + 2] === '\n'))
res += i > wsStart ? source.slice(wsStart, i + 1) : ch;
}
else {
res += ch;
}
}
if (source[source.length - 1] !== '"' || source.length === 1)
onError(source.length, 'MISSING_CHAR', 'Missing closing "quote');
return res;
}
/**
* Fold a single newline into a space, multiple newlines to N - 1 newlines.
* Presumes `source[offset] === '\n'`
*/
function foldNewline(source, offset) {
let fold = '';
let ch = source[offset + 1];
while (ch === ' ' || ch === '\t' || ch === '\n' || ch === '\r') {
if (ch === '\r' && source[offset + 2] !== '\n')
break;
if (ch === '\n')
fold += '\n';
offset += 1;
ch = source[offset + 1];
}
if (!fold)
fold = ' ';
return { fold, offset };
}
const escapeCodes = {
'0': '\0',
a: '\x07',
b: '\b',
e: '\x1b',
f: '\f',
n: '\n',
r: '\r',
t: '\t',
v: '\v',
N: '\u0085',
_: '\u00a0',
L: '\u2028',
P: '\u2029',
' ': ' ',
'"': '"',
'/': '/',
'\\': '\\',
'\t': '\t'
};
function parseCharCode(source, offset, length, onError) {
const cc = source.substr(offset, length);
const ok = cc.length === length && /^[0-9a-fA-F]+$/.test(cc);
const code = ok ? parseInt(cc, 16) : NaN;
if (isNaN(code)) {
const raw = source.substr(offset - 2, length + 2);
onError(offset - 2, 'BAD_DQ_ESCAPE', `Invalid escape sequence ${raw}`);
return raw;
}
return String.fromCodePoint(code);
}
export { resolveFlowScalar };
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