519 lines
21 KiB
JavaScript
519 lines
21 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = void 0;
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var _buffer = require("buffer");
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var _IRIs = _interopRequireDefault(require("./IRIs"));
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function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
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// **N3Lexer** tokenizes N3 documents.
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const {
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xsd
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} = _IRIs.default;
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// Regular expression and replacement string to escape N3 strings
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const escapeSequence = /\\u([a-fA-F0-9]{4})|\\U([a-fA-F0-9]{8})|\\([^])/g;
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const escapeReplacements = {
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'\\': '\\',
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"'": "'",
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'"': '"',
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'n': '\n',
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'r': '\r',
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't': '\t',
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'f': '\f',
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'b': '\b',
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'_': '_',
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'~': '~',
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'.': '.',
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'-': '-',
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'!': '!',
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'$': '$',
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'&': '&',
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'(': '(',
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')': ')',
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'*': '*',
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'+': '+',
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',': ',',
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';': ';',
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'=': '=',
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'/': '/',
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'?': '?',
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'#': '#',
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'@': '@',
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'%': '%'
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};
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const illegalIriChars = /[\x00-\x20<>\\"\{\}\|\^\`]/;
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const lineModeRegExps = {
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_iri: true,
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_unescapedIri: true,
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_simpleQuotedString: true,
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_langcode: true,
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_blank: true,
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_newline: true,
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_comment: true,
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_whitespace: true,
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_endOfFile: true
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};
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const invalidRegExp = /$0^/;
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// ## Constructor
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class N3Lexer {
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constructor(options) {
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// ## Regular expressions
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// It's slightly faster to have these as properties than as in-scope variables
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this._iri = /^<((?:[^ <>{}\\]|\\[uU])+)>[ \t]*/; // IRI with escape sequences; needs sanity check after unescaping
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this._unescapedIri = /^<([^\x00-\x20<>\\"\{\}\|\^\`]*)>[ \t]*/; // IRI without escape sequences; no unescaping
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this._simpleQuotedString = /^"([^"\\\r\n]*)"(?=[^"])/; // string without escape sequences
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this._simpleApostropheString = /^'([^'\\\r\n]*)'(?=[^'])/;
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this._langcode = /^@([a-z]+(?:-[a-z0-9]+)*)(?=[^a-z0-9\-])/i;
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this._prefix = /^((?:[A-Za-z\xc0-\xd6\xd8-\xf6\xf8-\u02ff\u0370-\u037d\u037f-\u1fff\u200c\u200d\u2070-\u218f\u2c00-\u2fef\u3001-\ud7ff\uf900-\ufdcf\ufdf0-\ufffd]|[\ud800-\udb7f][\udc00-\udfff])(?:\.?[\-0-9A-Z_a-z\xb7\xc0-\xd6\xd8-\xf6\xf8-\u037d\u037f-\u1fff\u200c\u200d\u203f\u2040\u2070-\u218f\u2c00-\u2fef\u3001-\ud7ff\uf900-\ufdcf\ufdf0-\ufffd]|[\ud800-\udb7f][\udc00-\udfff])*)?:(?=[#\s<])/;
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this._prefixed = /^((?:[A-Za-z\xc0-\xd6\xd8-\xf6\xf8-\u02ff\u0370-\u037d\u037f-\u1fff\u200c\u200d\u2070-\u218f\u2c00-\u2fef\u3001-\ud7ff\uf900-\ufdcf\ufdf0-\ufffd]|[\ud800-\udb7f][\udc00-\udfff])(?:\.?[\-0-9A-Z_a-z\xb7\xc0-\xd6\xd8-\xf6\xf8-\u037d\u037f-\u1fff\u200c\u200d\u203f\u2040\u2070-\u218f\u2c00-\u2fef\u3001-\ud7ff\uf900-\ufdcf\ufdf0-\ufffd]|[\ud800-\udb7f][\udc00-\udfff])*)?:((?:(?:[0-:A-Z_a-z\xc0-\xd6\xd8-\xf6\xf8-\u02ff\u0370-\u037d\u037f-\u1fff\u200c\u200d\u2070-\u218f\u2c00-\u2fef\u3001-\ud7ff\uf900-\ufdcf\ufdf0-\ufffd]|[\ud800-\udb7f][\udc00-\udfff]|%[0-9a-fA-F]{2}|\\[!#-\/;=?\-@_~])(?:(?:[\.\-0-:A-Z_a-z\xb7\xc0-\xd6\xd8-\xf6\xf8-\u037d\u037f-\u1fff\u200c\u200d\u203f\u2040\u2070-\u218f\u2c00-\u2fef\u3001-\ud7ff\uf900-\ufdcf\ufdf0-\ufffd]|[\ud800-\udb7f][\udc00-\udfff]|%[0-9a-fA-F]{2}|\\[!#-\/;=?\-@_~])*(?:[\-0-:A-Z_a-z\xb7\xc0-\xd6\xd8-\xf6\xf8-\u037d\u037f-\u1fff\u200c\u200d\u203f\u2040\u2070-\u218f\u2c00-\u2fef\u3001-\ud7ff\uf900-\ufdcf\ufdf0-\ufffd]|[\ud800-\udb7f][\udc00-\udfff]|%[0-9a-fA-F]{2}|\\[!#-\/;=?\-@_~]))?)?)(?:[ \t]+|(?=\.?[,;!\^\s#()\[\]\{\}"'<>]))/;
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this._variable = /^\?(?:(?:[A-Z_a-z\xc0-\xd6\xd8-\xf6\xf8-\u02ff\u0370-\u037d\u037f-\u1fff\u200c\u200d\u2070-\u218f\u2c00-\u2fef\u3001-\ud7ff\uf900-\ufdcf\ufdf0-\ufffd]|[\ud800-\udb7f][\udc00-\udfff])(?:[\-0-:A-Z_a-z\xb7\xc0-\xd6\xd8-\xf6\xf8-\u037d\u037f-\u1fff\u200c\u200d\u203f\u2040\u2070-\u218f\u2c00-\u2fef\u3001-\ud7ff\uf900-\ufdcf\ufdf0-\ufffd]|[\ud800-\udb7f][\udc00-\udfff])*)(?=[.,;!\^\s#()\[\]\{\}"'<>])/;
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this._blank = /^_:((?:[0-9A-Z_a-z\xc0-\xd6\xd8-\xf6\xf8-\u02ff\u0370-\u037d\u037f-\u1fff\u200c\u200d\u2070-\u218f\u2c00-\u2fef\u3001-\ud7ff\uf900-\ufdcf\ufdf0-\ufffd]|[\ud800-\udb7f][\udc00-\udfff])(?:\.?[\-0-9A-Z_a-z\xb7\xc0-\xd6\xd8-\xf6\xf8-\u037d\u037f-\u1fff\u200c\u200d\u203f\u2040\u2070-\u218f\u2c00-\u2fef\u3001-\ud7ff\uf900-\ufdcf\ufdf0-\ufffd]|[\ud800-\udb7f][\udc00-\udfff])*)(?:[ \t]+|(?=\.?[,;:\s#()\[\]\{\}"'<>]))/;
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this._number = /^[\-+]?(?:(\d+\.\d*|\.?\d+)[eE][\-+]?|\d*(\.)?)\d+(?=\.?[,;:\s#()\[\]\{\}"'<>])/;
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this._boolean = /^(?:true|false)(?=[.,;\s#()\[\]\{\}"'<>])/;
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this._keyword = /^@[a-z]+(?=[\s#<:])/i;
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this._sparqlKeyword = /^(?:PREFIX|BASE|GRAPH)(?=[\s#<])/i;
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this._shortPredicates = /^a(?=[\s#()\[\]\{\}"'<>])/;
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this._newline = /^[ \t]*(?:#[^\n\r]*)?(?:\r\n|\n|\r)[ \t]*/;
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this._comment = /#([^\n\r]*)/;
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this._whitespace = /^[ \t]+/;
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this._endOfFile = /^(?:#[^\n\r]*)?$/;
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options = options || {};
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// Whether the log:isImpliedBy predicate is supported
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this._isImpliedBy = options.isImpliedBy;
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// In line mode (N-Triples or N-Quads), only simple features may be parsed
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if (this._lineMode = !!options.lineMode) {
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this._n3Mode = false;
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// Don't tokenize special literals
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for (const key in this) {
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if (!(key in lineModeRegExps) && this[key] instanceof RegExp) this[key] = invalidRegExp;
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}
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}
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// When not in line mode, enable N3 functionality by default
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else {
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this._n3Mode = options.n3 !== false;
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}
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// Don't output comment tokens by default
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this.comments = !!options.comments;
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// Cache the last tested closing position of long literals
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this._literalClosingPos = 0;
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}
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// ## Private methods
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// ### `_tokenizeToEnd` tokenizes as for as possible, emitting tokens through the callback
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_tokenizeToEnd(callback, inputFinished) {
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// Continue parsing as far as possible; the loop will return eventually
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let input = this._input;
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let currentLineLength = input.length;
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while (true) {
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// Count and skip whitespace lines
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let whiteSpaceMatch, comment;
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while (whiteSpaceMatch = this._newline.exec(input)) {
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// Try to find a comment
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if (this.comments && (comment = this._comment.exec(whiteSpaceMatch[0]))) emitToken('comment', comment[1], '', this._line, whiteSpaceMatch[0].length);
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// Advance the input
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input = input.substr(whiteSpaceMatch[0].length, input.length);
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currentLineLength = input.length;
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this._line++;
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}
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// Skip whitespace on current line
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if (!whiteSpaceMatch && (whiteSpaceMatch = this._whitespace.exec(input))) input = input.substr(whiteSpaceMatch[0].length, input.length);
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// Stop for now if we're at the end
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if (this._endOfFile.test(input)) {
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// If the input is finished, emit EOF
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if (inputFinished) {
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// Try to find a final comment
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if (this.comments && (comment = this._comment.exec(input))) emitToken('comment', comment[1], '', this._line, input.length);
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input = null;
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emitToken('eof', '', '', this._line, 0);
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}
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return this._input = input;
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}
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// Look for specific token types based on the first character
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const line = this._line,
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firstChar = input[0];
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let type = '',
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value = '',
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prefix = '',
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match = null,
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matchLength = 0,
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inconclusive = false;
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switch (firstChar) {
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case '^':
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// We need at least 3 tokens lookahead to distinguish ^^<IRI> and ^^pre:fixed
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if (input.length < 3) break;
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// Try to match a type
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else if (input[1] === '^') {
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this._previousMarker = '^^';
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// Move to type IRI or prefixed name
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input = input.substr(2);
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if (input[0] !== '<') {
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inconclusive = true;
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break;
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}
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}
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// If no type, it must be a path expression
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else {
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if (this._n3Mode) {
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matchLength = 1;
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type = '^';
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}
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break;
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}
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// Fall through in case the type is an IRI
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case '<':
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// Try to find a full IRI without escape sequences
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if (match = this._unescapedIri.exec(input)) type = 'IRI', value = match[1];
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// Try to find a full IRI with escape sequences
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else if (match = this._iri.exec(input)) {
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value = this._unescape(match[1]);
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if (value === null || illegalIriChars.test(value)) return reportSyntaxError(this);
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type = 'IRI';
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}
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// Try to find a nested triple
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else if (input.length > 1 && input[1] === '<') type = '<<', matchLength = 2;
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// Try to find a backwards implication arrow
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else if (this._n3Mode && input.length > 1 && input[1] === '=') {
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matchLength = 2;
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if (this._isImpliedBy) type = 'abbreviation', value = '<';else type = 'inverse', value = '>';
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}
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break;
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case '>':
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if (input.length > 1 && input[1] === '>') type = '>>', matchLength = 2;
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break;
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case '_':
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// Try to find a blank node. Since it can contain (but not end with) a dot,
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// we always need a non-dot character before deciding it is a blank node.
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// Therefore, try inserting a space if we're at the end of the input.
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if ((match = this._blank.exec(input)) || inputFinished && (match = this._blank.exec(`${input} `))) type = 'blank', prefix = '_', value = match[1];
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break;
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case '"':
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// Try to find a literal without escape sequences
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if (match = this._simpleQuotedString.exec(input)) value = match[1];
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// Try to find a literal wrapped in three pairs of quotes
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else {
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({
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value,
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matchLength
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} = this._parseLiteral(input));
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if (value === null) return reportSyntaxError(this);
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}
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if (match !== null || matchLength !== 0) {
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type = 'literal';
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this._literalClosingPos = 0;
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}
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break;
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case "'":
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if (!this._lineMode) {
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// Try to find a literal without escape sequences
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if (match = this._simpleApostropheString.exec(input)) value = match[1];
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// Try to find a literal wrapped in three pairs of quotes
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else {
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({
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value,
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matchLength
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} = this._parseLiteral(input));
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if (value === null) return reportSyntaxError(this);
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}
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if (match !== null || matchLength !== 0) {
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type = 'literal';
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this._literalClosingPos = 0;
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}
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}
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break;
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case '?':
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// Try to find a variable
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if (this._n3Mode && (match = this._variable.exec(input))) type = 'var', value = match[0];
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break;
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case '@':
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// Try to find a language code
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if (this._previousMarker === 'literal' && (match = this._langcode.exec(input))) type = 'langcode', value = match[1];
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// Try to find a keyword
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else if (match = this._keyword.exec(input)) type = match[0];
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break;
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case '.':
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// Try to find a dot as punctuation
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if (input.length === 1 ? inputFinished : input[1] < '0' || input[1] > '9') {
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type = '.';
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matchLength = 1;
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break;
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}
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// Fall through to numerical case (could be a decimal dot)
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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case '+':
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case '-':
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// Try to find a number. Since it can contain (but not end with) a dot,
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// we always need a non-dot character before deciding it is a number.
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// Therefore, try inserting a space if we're at the end of the input.
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if (match = this._number.exec(input) || inputFinished && (match = this._number.exec(`${input} `))) {
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type = 'literal', value = match[0];
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prefix = typeof match[1] === 'string' ? xsd.double : typeof match[2] === 'string' ? xsd.decimal : xsd.integer;
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}
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break;
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case 'B':
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case 'b':
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case 'p':
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case 'P':
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case 'G':
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case 'g':
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// Try to find a SPARQL-style keyword
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if (match = this._sparqlKeyword.exec(input)) type = match[0].toUpperCase();else inconclusive = true;
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break;
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case 'f':
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case 't':
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// Try to match a boolean
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if (match = this._boolean.exec(input)) type = 'literal', value = match[0], prefix = xsd.boolean;else inconclusive = true;
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break;
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case 'a':
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// Try to find an abbreviated predicate
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if (match = this._shortPredicates.exec(input)) type = 'abbreviation', value = 'a';else inconclusive = true;
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break;
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case '=':
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// Try to find an implication arrow or equals sign
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if (this._n3Mode && input.length > 1) {
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type = 'abbreviation';
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if (input[1] !== '>') matchLength = 1, value = '=';else matchLength = 2, value = '>';
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}
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break;
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case '!':
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if (!this._n3Mode) break;
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case ',':
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case ';':
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case '[':
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case ']':
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case '(':
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case ')':
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case '}':
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if (!this._lineMode) {
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matchLength = 1;
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type = firstChar;
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}
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break;
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case '{':
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// We need at least 2 tokens lookahead to distinguish "{|" and "{ "
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if (!this._lineMode && input.length >= 2) {
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// Try to find a quoted triple annotation start
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if (input[1] === '|') type = '{|', matchLength = 2;else type = firstChar, matchLength = 1;
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}
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break;
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case '|':
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// We need 2 tokens lookahead to parse "|}"
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// Try to find a quoted triple annotation end
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if (input.length >= 2 && input[1] === '}') type = '|}', matchLength = 2;
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break;
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default:
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inconclusive = true;
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}
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// Some first characters do not allow an immediate decision, so inspect more
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if (inconclusive) {
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// Try to find a prefix
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if ((this._previousMarker === '@prefix' || this._previousMarker === 'PREFIX') && (match = this._prefix.exec(input))) type = 'prefix', value = match[1] || '';
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// Try to find a prefixed name. Since it can contain (but not end with) a dot,
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// we always need a non-dot character before deciding it is a prefixed name.
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// Therefore, try inserting a space if we're at the end of the input.
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else if ((match = this._prefixed.exec(input)) || inputFinished && (match = this._prefixed.exec(`${input} `))) type = 'prefixed', prefix = match[1] || '', value = this._unescape(match[2]);
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}
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// A type token is special: it can only be emitted after an IRI or prefixed name is read
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if (this._previousMarker === '^^') {
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switch (type) {
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case 'prefixed':
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type = 'type';
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break;
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case 'IRI':
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type = 'typeIRI';
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break;
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default:
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type = '';
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}
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}
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// What if nothing of the above was found?
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if (!type) {
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// We could be in streaming mode, and then we just wait for more input to arrive.
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// Otherwise, a syntax error has occurred in the input.
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// One exception: error on an unaccounted linebreak (= not inside a triple-quoted literal).
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if (inputFinished || !/^'''|^"""/.test(input) && /\n|\r/.test(input)) return reportSyntaxError(this);else return this._input = input;
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}
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// Emit the parsed token
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const length = matchLength || match[0].length;
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const token = emitToken(type, value, prefix, line, length);
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this.previousToken = token;
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this._previousMarker = type;
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// Advance to next part to tokenize
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input = input.substr(length, input.length);
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}
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// Emits the token through the callback
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function emitToken(type, value, prefix, line, length) {
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const start = input ? currentLineLength - input.length : currentLineLength;
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const end = start + length;
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const token = {
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type,
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value,
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prefix,
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line,
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start,
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end
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};
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callback(null, token);
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return token;
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}
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// Signals the syntax error through the callback
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function reportSyntaxError(self) {
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callback(self._syntaxError(/^\S*/.exec(input)[0]));
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}
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}
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// ### `_unescape` replaces N3 escape codes by their corresponding characters
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_unescape(item) {
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let invalid = false;
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const replaced = item.replace(escapeSequence, (sequence, unicode4, unicode8, escapedChar) => {
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// 4-digit unicode character
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|
if (typeof unicode4 === 'string') return String.fromCharCode(Number.parseInt(unicode4, 16));
|
|
// 8-digit unicode character
|
|
if (typeof unicode8 === 'string') {
|
|
let charCode = Number.parseInt(unicode8, 16);
|
|
return charCode <= 0xFFFF ? String.fromCharCode(Number.parseInt(unicode8, 16)) : String.fromCharCode(0xD800 + ((charCode -= 0x10000) >> 10), 0xDC00 + (charCode & 0x3FF));
|
|
}
|
|
// fixed escape sequence
|
|
if (escapedChar in escapeReplacements) return escapeReplacements[escapedChar];
|
|
// invalid escape sequence
|
|
invalid = true;
|
|
return '';
|
|
});
|
|
return invalid ? null : replaced;
|
|
}
|
|
|
|
// ### `_parseLiteral` parses a literal into an unescaped value
|
|
_parseLiteral(input) {
|
|
// Ensure we have enough lookahead to identify triple-quoted strings
|
|
if (input.length >= 3) {
|
|
// Identify the opening quote(s)
|
|
const opening = input.match(/^(?:"""|"|'''|'|)/)[0];
|
|
const openingLength = opening.length;
|
|
|
|
// Find the next candidate closing quotes
|
|
let closingPos = Math.max(this._literalClosingPos, openingLength);
|
|
while ((closingPos = input.indexOf(opening, closingPos)) > 0) {
|
|
// Count backslashes right before the closing quotes
|
|
let backslashCount = 0;
|
|
while (input[closingPos - backslashCount - 1] === '\\') backslashCount++;
|
|
|
|
// An even number of backslashes (in particular 0)
|
|
// means these are actual, non-escaped closing quotes
|
|
if (backslashCount % 2 === 0) {
|
|
// Extract and unescape the value
|
|
const raw = input.substring(openingLength, closingPos);
|
|
const lines = raw.split(/\r\n|\r|\n/).length - 1;
|
|
const matchLength = closingPos + openingLength;
|
|
// Only triple-quoted strings can be multi-line
|
|
if (openingLength === 1 && lines !== 0 || openingLength === 3 && this._lineMode) break;
|
|
this._line += lines;
|
|
return {
|
|
value: this._unescape(raw),
|
|
matchLength
|
|
};
|
|
}
|
|
closingPos++;
|
|
}
|
|
this._literalClosingPos = input.length - openingLength + 1;
|
|
}
|
|
return {
|
|
value: '',
|
|
matchLength: 0
|
|
};
|
|
}
|
|
|
|
// ### `_syntaxError` creates a syntax error for the given issue
|
|
_syntaxError(issue) {
|
|
this._input = null;
|
|
const err = new Error(`Unexpected "${issue}" on line ${this._line}.`);
|
|
err.context = {
|
|
token: undefined,
|
|
line: this._line,
|
|
previousToken: this.previousToken
|
|
};
|
|
return err;
|
|
}
|
|
|
|
// ### Strips off any starting UTF BOM mark.
|
|
_readStartingBom(input) {
|
|
return input.startsWith('\ufeff') ? input.substr(1) : input;
|
|
}
|
|
|
|
// ## Public methods
|
|
|
|
// ### `tokenize` starts the transformation of an N3 document into an array of tokens.
|
|
// The input can be a string or a stream.
|
|
tokenize(input, callback) {
|
|
this._line = 1;
|
|
|
|
// If the input is a string, continuously emit tokens through the callback until the end
|
|
if (typeof input === 'string') {
|
|
this._input = this._readStartingBom(input);
|
|
// If a callback was passed, asynchronously call it
|
|
if (typeof callback === 'function') queueMicrotask(() => this._tokenizeToEnd(callback, true));
|
|
// If no callback was passed, tokenize synchronously and return
|
|
else {
|
|
const tokens = [];
|
|
let error;
|
|
this._tokenizeToEnd((e, t) => e ? error = e : tokens.push(t), true);
|
|
if (error) throw error;
|
|
return tokens;
|
|
}
|
|
}
|
|
// Otherwise, the input must be a stream
|
|
else {
|
|
this._pendingBuffer = null;
|
|
if (typeof input.setEncoding === 'function') input.setEncoding('utf8');
|
|
// Adds the data chunk to the buffer and parses as far as possible
|
|
input.on('data', data => {
|
|
if (this._input !== null && data.length !== 0) {
|
|
// Prepend any previous pending writes
|
|
if (this._pendingBuffer) {
|
|
data = _buffer.Buffer.concat([this._pendingBuffer, data]);
|
|
this._pendingBuffer = null;
|
|
}
|
|
// Hold if the buffer ends in an incomplete unicode sequence
|
|
if (data[data.length - 1] & 0x80) {
|
|
this._pendingBuffer = data;
|
|
}
|
|
// Otherwise, tokenize as far as possible
|
|
else {
|
|
// Only read a BOM at the start
|
|
if (typeof this._input === 'undefined') this._input = this._readStartingBom(typeof data === 'string' ? data : data.toString());else this._input += data;
|
|
this._tokenizeToEnd(callback, false);
|
|
}
|
|
}
|
|
});
|
|
// Parses until the end
|
|
input.on('end', () => {
|
|
if (typeof this._input === 'string') this._tokenizeToEnd(callback, true);
|
|
});
|
|
input.on('error', callback);
|
|
}
|
|
}
|
|
}
|
|
exports.default = N3Lexer; |