| 1 | 'use strict';
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| 2 |
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| 3 | var cstScalar = require('./cst-scalar.js');
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| 4 | var cstStringify = require('./cst-stringify.js');
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| 5 | var cstVisit = require('./cst-visit.js');
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| 6 |
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| 7 | /** The byte order mark */
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| 8 | const BOM = '\u{FEFF}';
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| 9 | /** Start of doc-mode */
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| 10 | const DOCUMENT = '\x02'; // C0: Start of Text
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| 11 | /** Unexpected end of flow-mode */
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| 12 | const FLOW_END = '\x18'; // C0: Cancel
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| 13 | /** Next token is a scalar value */
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| 14 | const SCALAR = '\x1f'; // C0: Unit Separator
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| 15 | /** @returns `true` if `token` is a flow or block collection */
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| 16 | const isCollection = (token) => !!token && 'items' in token;
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| 17 | /** @returns `true` if `token` is a flow or block scalar; not an alias */
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| 18 | const isScalar = (token) => !!token &&
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| 19 | (token.type === 'scalar' ||
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| 20 | token.type === 'single-quoted-scalar' ||
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| 21 | token.type === 'double-quoted-scalar' ||
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| 22 | token.type === 'block-scalar');
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| 23 | /* istanbul ignore next */
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| 24 | /** Get a printable representation of a lexer token */
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| 25 | function prettyToken(token) {
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| 26 | switch (token) {
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| 27 | case BOM:
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| 28 | return '<BOM>';
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| 29 | case DOCUMENT:
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| 30 | return '<DOC>';
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| 31 | case FLOW_END:
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| 32 | return '<FLOW_END>';
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| 33 | case SCALAR:
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| 34 | return '<SCALAR>';
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| 35 | default:
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| 36 | return JSON.stringify(token);
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| 37 | }
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| 38 | }
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| 39 | /** Identify the type of a lexer token. May return `null` for unknown tokens. */
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| 40 | function tokenType(source) {
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| 41 | switch (source) {
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| 42 | case BOM:
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| 43 | return 'byte-order-mark';
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| 44 | case DOCUMENT:
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| 45 | return 'doc-mode';
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| 46 | case FLOW_END:
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| 47 | return 'flow-error-end';
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| 48 | case SCALAR:
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| 49 | return 'scalar';
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| 50 | case '---':
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| 51 | return 'doc-start';
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| 52 | case '...':
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| 53 | return 'doc-end';
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| 54 | case '':
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| 55 | case '\n':
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| 56 | case '\r\n':
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| 57 | return 'newline';
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| 58 | case '-':
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| 59 | return 'seq-item-ind';
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| 60 | case '?':
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| 61 | return 'explicit-key-ind';
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| 62 | case ':':
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| 63 | return 'map-value-ind';
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| 64 | case '{':
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| 65 | return 'flow-map-start';
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| 66 | case '}':
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| 67 | return 'flow-map-end';
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| 68 | case '[':
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| 69 | return 'flow-seq-start';
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| 70 | case ']':
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| 71 | return 'flow-seq-end';
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| 72 | case ',':
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| 73 | return 'comma';
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| 74 | }
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| 75 | switch (source[0]) {
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| 76 | case ' ':
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| 77 | case '\t':
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| 78 | return 'space';
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| 79 | case '#':
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| 80 | return 'comment';
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| 81 | case '%':
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| 82 | return 'directive-line';
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| 83 | case '*':
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| 84 | return 'alias';
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| 85 | case '&':
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| 86 | return 'anchor';
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| 87 | case '!':
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| 88 | return 'tag';
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| 89 | case "'":
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| 90 | return 'single-quoted-scalar';
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| 91 | case '"':
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| 92 | return 'double-quoted-scalar';
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| 93 | case '|':
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| 94 | case '>':
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| 95 | return 'block-scalar-header';
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| 96 | }
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| 97 | return null;
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| 98 | }
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| 99 |
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| 100 | exports.createScalarToken = cstScalar.createScalarToken;
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| 101 | exports.resolveAsScalar = cstScalar.resolveAsScalar;
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| 102 | exports.setScalarValue = cstScalar.setScalarValue;
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| 103 | exports.stringify = cstStringify.stringify;
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| 104 | exports.visit = cstVisit.visit;
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| 105 | exports.BOM = BOM;
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| 106 | exports.DOCUMENT = DOCUMENT;
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| 107 | exports.FLOW_END = FLOW_END;
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| 108 | exports.SCALAR = SCALAR;
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| 109 | exports.isCollection = isCollection;
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| 110 | exports.isScalar = isScalar;
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| 111 | exports.prettyToken = prettyToken;
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| 112 | exports.tokenType = tokenType;
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