953 lines
34 KiB
JavaScript
953 lines
34 KiB
JavaScript
import { tokenType } from './cst.js';
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import { Lexer } from './lexer.js';
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function includesToken(list, type) {
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for (let i = 0; i < list.length; ++i)
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if (list[i].type === type)
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return true;
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return false;
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}
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function findNonEmptyIndex(list) {
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for (let i = 0; i < list.length; ++i) {
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switch (list[i].type) {
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case 'space':
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case 'comment':
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case 'newline':
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break;
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default:
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return i;
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}
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}
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return -1;
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}
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function isFlowToken(token) {
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switch (token?.type) {
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case 'alias':
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case 'scalar':
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case 'single-quoted-scalar':
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case 'double-quoted-scalar':
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case 'flow-collection':
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return true;
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default:
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return false;
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}
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}
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function getPrevProps(parent) {
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switch (parent.type) {
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case 'document':
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return parent.start;
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case 'block-map': {
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const it = parent.items[parent.items.length - 1];
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return it.sep ?? it.start;
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}
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case 'block-seq':
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return parent.items[parent.items.length - 1].start;
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/* istanbul ignore next should not happen */
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default:
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return [];
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}
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}
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/** Note: May modify input array */
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function getFirstKeyStartProps(prev) {
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if (prev.length === 0)
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return [];
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let i = prev.length;
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loop: while (--i >= 0) {
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switch (prev[i].type) {
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case 'doc-start':
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case 'explicit-key-ind':
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case 'map-value-ind':
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case 'seq-item-ind':
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case 'newline':
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break loop;
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}
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}
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while (prev[++i]?.type === 'space') {
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/* loop */
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}
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return prev.splice(i, prev.length);
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}
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function fixFlowSeqItems(fc) {
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if (fc.start.type === 'flow-seq-start') {
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for (const it of fc.items) {
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if (it.sep &&
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!it.value &&
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!includesToken(it.start, 'explicit-key-ind') &&
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!includesToken(it.sep, 'map-value-ind')) {
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if (it.key)
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it.value = it.key;
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delete it.key;
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if (isFlowToken(it.value)) {
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if (it.value.end)
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Array.prototype.push.apply(it.value.end, it.sep);
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else
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it.value.end = it.sep;
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}
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else
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Array.prototype.push.apply(it.start, it.sep);
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delete it.sep;
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}
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}
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}
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}
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/**
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* A YAML concrete syntax tree (CST) parser
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*
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* ```ts
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* const src: string = ...
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* for (const token of new Parser().parse(src)) {
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* // token: Token
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* }
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* ```
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*
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* To use the parser with a user-provided lexer:
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*
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* ```ts
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* function* parse(source: string, lexer: Lexer) {
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* const parser = new Parser()
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* for (const lexeme of lexer.lex(source))
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* yield* parser.next(lexeme)
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* yield* parser.end()
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* }
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*
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* const src: string = ...
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* const lexer = new Lexer()
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* for (const token of parse(src, lexer)) {
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* // token: Token
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* }
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* ```
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*/
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class Parser {
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/**
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* @param onNewLine - If defined, called separately with the start position of
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* each new line (in `parse()`, including the start of input).
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*/
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constructor(onNewLine) {
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/** If true, space and sequence indicators count as indentation */
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this.atNewLine = true;
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/** If true, next token is a scalar value */
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this.atScalar = false;
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/** Current indentation level */
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this.indent = 0;
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/** Current offset since the start of parsing */
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this.offset = 0;
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/** On the same line with a block map key */
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this.onKeyLine = false;
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/** Top indicates the node that's currently being built */
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this.stack = [];
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/** The source of the current token, set in parse() */
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this.source = '';
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/** The type of the current token, set in parse() */
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this.type = '';
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// Must be defined after `next()`
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this.lexer = new Lexer();
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this.onNewLine = onNewLine;
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}
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/**
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* Parse `source` as a YAML stream.
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* If `incomplete`, a part of the last line may be left as a buffer for the next call.
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*
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* Errors are not thrown, but yielded as `{ type: 'error', message }` tokens.
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*
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* @returns A generator of tokens representing each directive, document, and other structure.
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*/
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*parse(source, incomplete = false) {
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if (this.onNewLine && this.offset === 0)
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this.onNewLine(0);
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for (const lexeme of this.lexer.lex(source, incomplete))
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yield* this.next(lexeme);
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if (!incomplete)
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yield* this.end();
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}
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/**
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* Advance the parser by the `source` of one lexical token.
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*/
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*next(source) {
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this.source = source;
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if (this.atScalar) {
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this.atScalar = false;
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yield* this.step();
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this.offset += source.length;
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return;
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}
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const type = tokenType(source);
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if (!type) {
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const message = `Not a YAML token: ${source}`;
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yield* this.pop({ type: 'error', offset: this.offset, message, source });
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this.offset += source.length;
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}
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else if (type === 'scalar') {
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this.atNewLine = false;
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this.atScalar = true;
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this.type = 'scalar';
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}
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else {
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this.type = type;
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yield* this.step();
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switch (type) {
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case 'newline':
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this.atNewLine = true;
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this.indent = 0;
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if (this.onNewLine)
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this.onNewLine(this.offset + source.length);
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break;
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case 'space':
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if (this.atNewLine && source[0] === ' ')
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this.indent += source.length;
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break;
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case 'explicit-key-ind':
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case 'map-value-ind':
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case 'seq-item-ind':
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if (this.atNewLine)
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this.indent += source.length;
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break;
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case 'doc-mode':
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case 'flow-error-end':
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return;
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default:
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this.atNewLine = false;
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}
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this.offset += source.length;
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}
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}
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/** Call at end of input to push out any remaining constructions */
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*end() {
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while (this.stack.length > 0)
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yield* this.pop();
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}
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get sourceToken() {
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const st = {
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type: this.type,
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offset: this.offset,
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indent: this.indent,
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source: this.source
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};
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return st;
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}
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*step() {
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const top = this.peek(1);
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if (this.type === 'doc-end' && (!top || top.type !== 'doc-end')) {
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while (this.stack.length > 0)
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yield* this.pop();
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this.stack.push({
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type: 'doc-end',
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offset: this.offset,
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source: this.source
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});
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return;
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}
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if (!top)
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return yield* this.stream();
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switch (top.type) {
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case 'document':
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return yield* this.document(top);
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case 'alias':
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case 'scalar':
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case 'single-quoted-scalar':
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case 'double-quoted-scalar':
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return yield* this.scalar(top);
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case 'block-scalar':
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return yield* this.blockScalar(top);
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case 'block-map':
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return yield* this.blockMap(top);
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case 'block-seq':
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return yield* this.blockSequence(top);
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case 'flow-collection':
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return yield* this.flowCollection(top);
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case 'doc-end':
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return yield* this.documentEnd(top);
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}
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/* istanbul ignore next should not happen */
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yield* this.pop();
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}
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peek(n) {
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return this.stack[this.stack.length - n];
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}
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*pop(error) {
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const token = error ?? this.stack.pop();
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/* istanbul ignore if should not happen */
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if (!token) {
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const message = 'Tried to pop an empty stack';
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yield { type: 'error', offset: this.offset, source: '', message };
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}
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else if (this.stack.length === 0) {
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yield token;
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}
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else {
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const top = this.peek(1);
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if (token.type === 'block-scalar') {
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// Block scalars use their parent rather than header indent
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token.indent = 'indent' in top ? top.indent : 0;
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}
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else if (token.type === 'flow-collection' && top.type === 'document') {
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// Ignore all indent for top-level flow collections
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token.indent = 0;
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}
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if (token.type === 'flow-collection')
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fixFlowSeqItems(token);
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switch (top.type) {
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case 'document':
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top.value = token;
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break;
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case 'block-scalar':
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top.props.push(token); // error
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break;
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case 'block-map': {
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const it = top.items[top.items.length - 1];
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if (it.value) {
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top.items.push({ start: [], key: token, sep: [] });
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this.onKeyLine = true;
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return;
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}
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else if (it.sep) {
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it.value = token;
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}
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else {
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Object.assign(it, { key: token, sep: [] });
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this.onKeyLine = !it.explicitKey;
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return;
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}
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break;
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}
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case 'block-seq': {
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const it = top.items[top.items.length - 1];
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if (it.value)
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top.items.push({ start: [], value: token });
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else
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it.value = token;
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break;
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}
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case 'flow-collection': {
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const it = top.items[top.items.length - 1];
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if (!it || it.value)
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top.items.push({ start: [], key: token, sep: [] });
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else if (it.sep)
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it.value = token;
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else
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Object.assign(it, { key: token, sep: [] });
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return;
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}
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/* istanbul ignore next should not happen */
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default:
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yield* this.pop();
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yield* this.pop(token);
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}
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if ((top.type === 'document' ||
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top.type === 'block-map' ||
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top.type === 'block-seq') &&
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(token.type === 'block-map' || token.type === 'block-seq')) {
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const last = token.items[token.items.length - 1];
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if (last &&
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!last.sep &&
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!last.value &&
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last.start.length > 0 &&
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findNonEmptyIndex(last.start) === -1 &&
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(token.indent === 0 ||
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last.start.every(st => st.type !== 'comment' || st.indent < token.indent))) {
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if (top.type === 'document')
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top.end = last.start;
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else
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top.items.push({ start: last.start });
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token.items.splice(-1, 1);
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}
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}
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}
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}
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*stream() {
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switch (this.type) {
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case 'directive-line':
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yield { type: 'directive', offset: this.offset, source: this.source };
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return;
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case 'byte-order-mark':
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case 'space':
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case 'comment':
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case 'newline':
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yield this.sourceToken;
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return;
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case 'doc-mode':
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case 'doc-start': {
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const doc = {
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type: 'document',
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offset: this.offset,
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start: []
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};
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if (this.type === 'doc-start')
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doc.start.push(this.sourceToken);
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this.stack.push(doc);
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return;
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}
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}
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yield {
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type: 'error',
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offset: this.offset,
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message: `Unexpected ${this.type} token in YAML stream`,
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source: this.source
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};
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}
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*document(doc) {
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if (doc.value)
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return yield* this.lineEnd(doc);
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switch (this.type) {
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case 'doc-start': {
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if (findNonEmptyIndex(doc.start) !== -1) {
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yield* this.pop();
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yield* this.step();
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}
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else
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doc.start.push(this.sourceToken);
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return;
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}
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case 'anchor':
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case 'tag':
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case 'space':
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case 'comment':
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case 'newline':
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doc.start.push(this.sourceToken);
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return;
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}
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const bv = this.startBlockValue(doc);
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if (bv)
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this.stack.push(bv);
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else {
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yield {
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type: 'error',
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offset: this.offset,
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message: `Unexpected ${this.type} token in YAML document`,
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source: this.source
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};
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}
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}
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*scalar(scalar) {
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if (this.type === 'map-value-ind') {
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const prev = getPrevProps(this.peek(2));
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const start = getFirstKeyStartProps(prev);
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let sep;
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if (scalar.end) {
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sep = scalar.end;
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sep.push(this.sourceToken);
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delete scalar.end;
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}
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else
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sep = [this.sourceToken];
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const map = {
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type: 'block-map',
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offset: scalar.offset,
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indent: scalar.indent,
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items: [{ start, key: scalar, sep }]
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};
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this.onKeyLine = true;
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this.stack[this.stack.length - 1] = map;
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}
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else
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yield* this.lineEnd(scalar);
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}
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*blockScalar(scalar) {
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switch (this.type) {
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case 'space':
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case 'comment':
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case 'newline':
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scalar.props.push(this.sourceToken);
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return;
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case 'scalar':
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scalar.source = this.source;
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// block-scalar source includes trailing newline
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this.atNewLine = true;
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this.indent = 0;
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if (this.onNewLine) {
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let nl = this.source.indexOf('\n') + 1;
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while (nl !== 0) {
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this.onNewLine(this.offset + nl);
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nl = this.source.indexOf('\n', nl) + 1;
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}
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}
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yield* this.pop();
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break;
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/* istanbul ignore next should not happen */
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default:
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yield* this.pop();
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yield* this.step();
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}
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}
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*blockMap(map) {
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const it = map.items[map.items.length - 1];
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// it.sep is true-ish if pair already has key or : separator
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switch (this.type) {
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case 'newline':
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this.onKeyLine = false;
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if (it.value) {
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const end = 'end' in it.value ? it.value.end : undefined;
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const last = Array.isArray(end) ? end[end.length - 1] : undefined;
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if (last?.type === 'comment')
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end?.push(this.sourceToken);
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else
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map.items.push({ start: [this.sourceToken] });
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}
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else if (it.sep) {
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it.sep.push(this.sourceToken);
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}
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else {
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it.start.push(this.sourceToken);
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}
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return;
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case 'space':
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case 'comment':
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if (it.value) {
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map.items.push({ start: [this.sourceToken] });
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}
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else if (it.sep) {
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it.sep.push(this.sourceToken);
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}
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else {
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if (this.atIndentedComment(it.start, map.indent)) {
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const prev = map.items[map.items.length - 2];
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const end = prev?.value?.end;
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if (Array.isArray(end)) {
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Array.prototype.push.apply(end, it.start);
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end.push(this.sourceToken);
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map.items.pop();
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return;
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}
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}
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it.start.push(this.sourceToken);
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}
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return;
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}
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if (this.indent >= map.indent) {
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const atMapIndent = !this.onKeyLine && this.indent === map.indent;
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const atNextItem = atMapIndent &&
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(it.sep || it.explicitKey) &&
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this.type !== 'seq-item-ind';
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// For empty nodes, assign newline-separated not indented empty tokens to following node
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let start = [];
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if (atNextItem && it.sep && !it.value) {
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const nl = [];
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for (let i = 0; i < it.sep.length; ++i) {
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const st = it.sep[i];
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switch (st.type) {
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case 'newline':
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nl.push(i);
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break;
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case 'space':
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break;
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case 'comment':
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if (st.indent > map.indent)
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nl.length = 0;
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break;
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default:
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nl.length = 0;
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}
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}
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if (nl.length >= 2)
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start = it.sep.splice(nl[1]);
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}
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switch (this.type) {
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case 'anchor':
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case 'tag':
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if (atNextItem || it.value) {
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start.push(this.sourceToken);
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map.items.push({ start });
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this.onKeyLine = true;
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}
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else if (it.sep) {
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it.sep.push(this.sourceToken);
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}
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else {
|
|
it.start.push(this.sourceToken);
|
|
}
|
|
return;
|
|
case 'explicit-key-ind':
|
|
if (!it.sep && !it.explicitKey) {
|
|
it.start.push(this.sourceToken);
|
|
it.explicitKey = true;
|
|
}
|
|
else if (atNextItem || it.value) {
|
|
start.push(this.sourceToken);
|
|
map.items.push({ start, explicitKey: true });
|
|
}
|
|
else {
|
|
this.stack.push({
|
|
type: 'block-map',
|
|
offset: this.offset,
|
|
indent: this.indent,
|
|
items: [{ start: [this.sourceToken], explicitKey: true }]
|
|
});
|
|
}
|
|
this.onKeyLine = true;
|
|
return;
|
|
case 'map-value-ind':
|
|
if (it.explicitKey) {
|
|
if (!it.sep) {
|
|
if (includesToken(it.start, 'newline')) {
|
|
Object.assign(it, { key: null, sep: [this.sourceToken] });
|
|
}
|
|
else {
|
|
const start = getFirstKeyStartProps(it.start);
|
|
this.stack.push({
|
|
type: 'block-map',
|
|
offset: this.offset,
|
|
indent: this.indent,
|
|
items: [{ start, key: null, sep: [this.sourceToken] }]
|
|
});
|
|
}
|
|
}
|
|
else if (it.value) {
|
|
map.items.push({ start: [], key: null, sep: [this.sourceToken] });
|
|
}
|
|
else if (includesToken(it.sep, 'map-value-ind')) {
|
|
this.stack.push({
|
|
type: 'block-map',
|
|
offset: this.offset,
|
|
indent: this.indent,
|
|
items: [{ start, key: null, sep: [this.sourceToken] }]
|
|
});
|
|
}
|
|
else if (isFlowToken(it.key) &&
|
|
!includesToken(it.sep, 'newline')) {
|
|
const start = getFirstKeyStartProps(it.start);
|
|
const key = it.key;
|
|
const sep = it.sep;
|
|
sep.push(this.sourceToken);
|
|
// @ts-expect-error type guard is wrong here
|
|
delete it.key, delete it.sep;
|
|
this.stack.push({
|
|
type: 'block-map',
|
|
offset: this.offset,
|
|
indent: this.indent,
|
|
items: [{ start, key, sep }]
|
|
});
|
|
}
|
|
else if (start.length > 0) {
|
|
// Not actually at next item
|
|
it.sep = it.sep.concat(start, this.sourceToken);
|
|
}
|
|
else {
|
|
it.sep.push(this.sourceToken);
|
|
}
|
|
}
|
|
else {
|
|
if (!it.sep) {
|
|
Object.assign(it, { key: null, sep: [this.sourceToken] });
|
|
}
|
|
else if (it.value || atNextItem) {
|
|
map.items.push({ start, key: null, sep: [this.sourceToken] });
|
|
}
|
|
else if (includesToken(it.sep, 'map-value-ind')) {
|
|
this.stack.push({
|
|
type: 'block-map',
|
|
offset: this.offset,
|
|
indent: this.indent,
|
|
items: [{ start: [], key: null, sep: [this.sourceToken] }]
|
|
});
|
|
}
|
|
else {
|
|
it.sep.push(this.sourceToken);
|
|
}
|
|
}
|
|
this.onKeyLine = true;
|
|
return;
|
|
case 'alias':
|
|
case 'scalar':
|
|
case 'single-quoted-scalar':
|
|
case 'double-quoted-scalar': {
|
|
const fs = this.flowScalar(this.type);
|
|
if (atNextItem || it.value) {
|
|
map.items.push({ start, key: fs, sep: [] });
|
|
this.onKeyLine = true;
|
|
}
|
|
else if (it.sep) {
|
|
this.stack.push(fs);
|
|
}
|
|
else {
|
|
Object.assign(it, { key: fs, sep: [] });
|
|
this.onKeyLine = true;
|
|
}
|
|
return;
|
|
}
|
|
default: {
|
|
const bv = this.startBlockValue(map);
|
|
if (bv) {
|
|
if (atMapIndent && bv.type !== 'block-seq') {
|
|
map.items.push({ start });
|
|
}
|
|
this.stack.push(bv);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
yield* this.pop();
|
|
yield* this.step();
|
|
}
|
|
*blockSequence(seq) {
|
|
const it = seq.items[seq.items.length - 1];
|
|
switch (this.type) {
|
|
case 'newline':
|
|
if (it.value) {
|
|
const end = 'end' in it.value ? it.value.end : undefined;
|
|
const last = Array.isArray(end) ? end[end.length - 1] : undefined;
|
|
if (last?.type === 'comment')
|
|
end?.push(this.sourceToken);
|
|
else
|
|
seq.items.push({ start: [this.sourceToken] });
|
|
}
|
|
else
|
|
it.start.push(this.sourceToken);
|
|
return;
|
|
case 'space':
|
|
case 'comment':
|
|
if (it.value)
|
|
seq.items.push({ start: [this.sourceToken] });
|
|
else {
|
|
if (this.atIndentedComment(it.start, seq.indent)) {
|
|
const prev = seq.items[seq.items.length - 2];
|
|
const end = prev?.value?.end;
|
|
if (Array.isArray(end)) {
|
|
Array.prototype.push.apply(end, it.start);
|
|
end.push(this.sourceToken);
|
|
seq.items.pop();
|
|
return;
|
|
}
|
|
}
|
|
it.start.push(this.sourceToken);
|
|
}
|
|
return;
|
|
case 'anchor':
|
|
case 'tag':
|
|
if (it.value || this.indent <= seq.indent)
|
|
break;
|
|
it.start.push(this.sourceToken);
|
|
return;
|
|
case 'seq-item-ind':
|
|
if (this.indent !== seq.indent)
|
|
break;
|
|
if (it.value || includesToken(it.start, 'seq-item-ind'))
|
|
seq.items.push({ start: [this.sourceToken] });
|
|
else
|
|
it.start.push(this.sourceToken);
|
|
return;
|
|
}
|
|
if (this.indent > seq.indent) {
|
|
const bv = this.startBlockValue(seq);
|
|
if (bv) {
|
|
this.stack.push(bv);
|
|
return;
|
|
}
|
|
}
|
|
yield* this.pop();
|
|
yield* this.step();
|
|
}
|
|
*flowCollection(fc) {
|
|
const it = fc.items[fc.items.length - 1];
|
|
if (this.type === 'flow-error-end') {
|
|
let top;
|
|
do {
|
|
yield* this.pop();
|
|
top = this.peek(1);
|
|
} while (top && top.type === 'flow-collection');
|
|
}
|
|
else if (fc.end.length === 0) {
|
|
switch (this.type) {
|
|
case 'comma':
|
|
case 'explicit-key-ind':
|
|
if (!it || it.sep)
|
|
fc.items.push({ start: [this.sourceToken] });
|
|
else
|
|
it.start.push(this.sourceToken);
|
|
return;
|
|
case 'map-value-ind':
|
|
if (!it || it.value)
|
|
fc.items.push({ start: [], key: null, sep: [this.sourceToken] });
|
|
else if (it.sep)
|
|
it.sep.push(this.sourceToken);
|
|
else
|
|
Object.assign(it, { key: null, sep: [this.sourceToken] });
|
|
return;
|
|
case 'space':
|
|
case 'comment':
|
|
case 'newline':
|
|
case 'anchor':
|
|
case 'tag':
|
|
if (!it || it.value)
|
|
fc.items.push({ start: [this.sourceToken] });
|
|
else if (it.sep)
|
|
it.sep.push(this.sourceToken);
|
|
else
|
|
it.start.push(this.sourceToken);
|
|
return;
|
|
case 'alias':
|
|
case 'scalar':
|
|
case 'single-quoted-scalar':
|
|
case 'double-quoted-scalar': {
|
|
const fs = this.flowScalar(this.type);
|
|
if (!it || it.value)
|
|
fc.items.push({ start: [], key: fs, sep: [] });
|
|
else if (it.sep)
|
|
this.stack.push(fs);
|
|
else
|
|
Object.assign(it, { key: fs, sep: [] });
|
|
return;
|
|
}
|
|
case 'flow-map-end':
|
|
case 'flow-seq-end':
|
|
fc.end.push(this.sourceToken);
|
|
return;
|
|
}
|
|
const bv = this.startBlockValue(fc);
|
|
/* istanbul ignore else should not happen */
|
|
if (bv)
|
|
this.stack.push(bv);
|
|
else {
|
|
yield* this.pop();
|
|
yield* this.step();
|
|
}
|
|
}
|
|
else {
|
|
const parent = this.peek(2);
|
|
if (parent.type === 'block-map' &&
|
|
((this.type === 'map-value-ind' && parent.indent === fc.indent) ||
|
|
(this.type === 'newline' &&
|
|
!parent.items[parent.items.length - 1].sep))) {
|
|
yield* this.pop();
|
|
yield* this.step();
|
|
}
|
|
else if (this.type === 'map-value-ind' &&
|
|
parent.type !== 'flow-collection') {
|
|
const prev = getPrevProps(parent);
|
|
const start = getFirstKeyStartProps(prev);
|
|
fixFlowSeqItems(fc);
|
|
const sep = fc.end.splice(1, fc.end.length);
|
|
sep.push(this.sourceToken);
|
|
const map = {
|
|
type: 'block-map',
|
|
offset: fc.offset,
|
|
indent: fc.indent,
|
|
items: [{ start, key: fc, sep }]
|
|
};
|
|
this.onKeyLine = true;
|
|
this.stack[this.stack.length - 1] = map;
|
|
}
|
|
else {
|
|
yield* this.lineEnd(fc);
|
|
}
|
|
}
|
|
}
|
|
flowScalar(type) {
|
|
if (this.onNewLine) {
|
|
let nl = this.source.indexOf('\n') + 1;
|
|
while (nl !== 0) {
|
|
this.onNewLine(this.offset + nl);
|
|
nl = this.source.indexOf('\n', nl) + 1;
|
|
}
|
|
}
|
|
return {
|
|
type,
|
|
offset: this.offset,
|
|
indent: this.indent,
|
|
source: this.source
|
|
};
|
|
}
|
|
startBlockValue(parent) {
|
|
switch (this.type) {
|
|
case 'alias':
|
|
case 'scalar':
|
|
case 'single-quoted-scalar':
|
|
case 'double-quoted-scalar':
|
|
return this.flowScalar(this.type);
|
|
case 'block-scalar-header':
|
|
return {
|
|
type: 'block-scalar',
|
|
offset: this.offset,
|
|
indent: this.indent,
|
|
props: [this.sourceToken],
|
|
source: ''
|
|
};
|
|
case 'flow-map-start':
|
|
case 'flow-seq-start':
|
|
return {
|
|
type: 'flow-collection',
|
|
offset: this.offset,
|
|
indent: this.indent,
|
|
start: this.sourceToken,
|
|
items: [],
|
|
end: []
|
|
};
|
|
case 'seq-item-ind':
|
|
return {
|
|
type: 'block-seq',
|
|
offset: this.offset,
|
|
indent: this.indent,
|
|
items: [{ start: [this.sourceToken] }]
|
|
};
|
|
case 'explicit-key-ind': {
|
|
this.onKeyLine = true;
|
|
const prev = getPrevProps(parent);
|
|
const start = getFirstKeyStartProps(prev);
|
|
start.push(this.sourceToken);
|
|
return {
|
|
type: 'block-map',
|
|
offset: this.offset,
|
|
indent: this.indent,
|
|
items: [{ start, explicitKey: true }]
|
|
};
|
|
}
|
|
case 'map-value-ind': {
|
|
this.onKeyLine = true;
|
|
const prev = getPrevProps(parent);
|
|
const start = getFirstKeyStartProps(prev);
|
|
return {
|
|
type: 'block-map',
|
|
offset: this.offset,
|
|
indent: this.indent,
|
|
items: [{ start, key: null, sep: [this.sourceToken] }]
|
|
};
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
atIndentedComment(start, indent) {
|
|
if (this.type !== 'comment')
|
|
return false;
|
|
if (this.indent <= indent)
|
|
return false;
|
|
return start.every(st => st.type === 'newline' || st.type === 'space');
|
|
}
|
|
*documentEnd(docEnd) {
|
|
if (this.type !== 'doc-mode') {
|
|
if (docEnd.end)
|
|
docEnd.end.push(this.sourceToken);
|
|
else
|
|
docEnd.end = [this.sourceToken];
|
|
if (this.type === 'newline')
|
|
yield* this.pop();
|
|
}
|
|
}
|
|
*lineEnd(token) {
|
|
switch (this.type) {
|
|
case 'comma':
|
|
case 'doc-start':
|
|
case 'doc-end':
|
|
case 'flow-seq-end':
|
|
case 'flow-map-end':
|
|
case 'map-value-ind':
|
|
yield* this.pop();
|
|
yield* this.step();
|
|
break;
|
|
case 'newline':
|
|
this.onKeyLine = false;
|
|
// fallthrough
|
|
case 'space':
|
|
case 'comment':
|
|
default:
|
|
// all other values are errors
|
|
if (token.end)
|
|
token.end.push(this.sourceToken);
|
|
else
|
|
token.end = [this.sourceToken];
|
|
if (this.type === 'newline')
|
|
yield* this.pop();
|
|
}
|
|
}
|
|
}
|
|
|
|
export { Parser };
|