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tatianamac
296
node_modules/character-parser/index.js
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vendored
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296
node_modules/character-parser/index.js
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'use strict';
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var objIsRegex = require('is-regex');
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exports = (module.exports = parse);
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var TOKEN_TYPES = exports.TOKEN_TYPES = {
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LINE_COMMENT: '//',
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BLOCK_COMMENT: '/**/',
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SINGLE_QUOTE: '\'',
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DOUBLE_QUOTE: '"',
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TEMPLATE_QUOTE: '`',
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REGEXP: '//g'
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}
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var BRACKETS = exports.BRACKETS = {
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'(': ')',
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'{': '}',
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'[': ']'
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};
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var BRACKETS_REVERSED = {
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')': '(',
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'}': '{',
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']': '['
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};
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exports.parse = parse;
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function parse(src, state, options) {
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options = options || {};
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state = state || exports.defaultState();
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var start = options.start || 0;
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var end = options.end || src.length;
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var index = start;
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while (index < end) {
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try {
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parseChar(src[index], state);
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} catch (ex) {
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ex.index = index;
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throw ex;
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}
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index++;
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}
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return state;
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}
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exports.parseUntil = parseUntil;
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function parseUntil(src, delimiter, options) {
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options = options || {};
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var start = options.start || 0;
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var index = start;
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var state = exports.defaultState();
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while (index < src.length) {
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if ((options.ignoreNesting || !state.isNesting(options)) && matches(src, delimiter, index)) {
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var end = index;
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return {
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start: start,
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end: end,
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src: src.substring(start, end)
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};
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}
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try {
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parseChar(src[index], state);
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} catch (ex) {
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ex.index = index;
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throw ex;
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}
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index++;
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}
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var err = new Error('The end of the string was reached with no closing bracket found.');
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err.code = 'CHARACTER_PARSER:END_OF_STRING_REACHED';
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err.index = index;
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throw err;
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}
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exports.parseChar = parseChar;
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function parseChar(character, state) {
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if (character.length !== 1) {
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var err = new Error('Character must be a string of length 1');
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err.name = 'InvalidArgumentError';
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err.code = 'CHARACTER_PARSER:CHAR_LENGTH_NOT_ONE';
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throw err;
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}
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state = state || exports.defaultState();
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state.src += character;
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var wasComment = state.isComment();
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var lastChar = state.history ? state.history[0] : '';
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if (state.regexpStart) {
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if (character === '/' || character == '*') {
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state.stack.pop();
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}
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state.regexpStart = false;
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}
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switch (state.current()) {
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case TOKEN_TYPES.LINE_COMMENT:
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if (character === '\n') {
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state.stack.pop();
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}
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break;
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case TOKEN_TYPES.BLOCK_COMMENT:
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if (state.lastChar === '*' && character === '/') {
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state.stack.pop();
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}
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break;
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case TOKEN_TYPES.SINGLE_QUOTE:
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if (character === '\'' && !state.escaped) {
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state.stack.pop();
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} else if (character === '\\' && !state.escaped) {
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state.escaped = true;
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} else {
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state.escaped = false;
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}
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break;
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case TOKEN_TYPES.DOUBLE_QUOTE:
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if (character === '"' && !state.escaped) {
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state.stack.pop();
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} else if (character === '\\' && !state.escaped) {
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state.escaped = true;
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} else {
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state.escaped = false;
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}
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break;
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case TOKEN_TYPES.TEMPLATE_QUOTE:
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if (character === '`' && !state.escaped) {
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state.stack.pop();
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state.hasDollar = false;
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} else if (character === '\\' && !state.escaped) {
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state.escaped = true;
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state.hasDollar = false;
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} else if (character === '$' && !state.escaped) {
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state.hasDollar = true;
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} else if (character === '{' && state.hasDollar) {
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state.stack.push(BRACKETS[character]);
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} else {
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state.escaped = false;
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state.hasDollar = false;
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}
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break;
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case TOKEN_TYPES.REGEXP:
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if (character === '/' && !state.escaped) {
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state.stack.pop();
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} else if (character === '\\' && !state.escaped) {
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state.escaped = true;
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} else {
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state.escaped = false;
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}
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break;
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default:
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if (character in BRACKETS) {
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state.stack.push(BRACKETS[character]);
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} else if (character in BRACKETS_REVERSED) {
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if (state.current() !== character) {
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var err = new SyntaxError('Mismatched Bracket: ' + character);
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err.code = 'CHARACTER_PARSER:MISMATCHED_BRACKET';
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throw err;
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};
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state.stack.pop();
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} else if (lastChar === '/' && character === '/') {
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// Don't include comments in history
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state.history = state.history.substr(1);
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state.stack.push(TOKEN_TYPES.LINE_COMMENT);
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} else if (lastChar === '/' && character === '*') {
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// Don't include comment in history
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state.history = state.history.substr(1);
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state.stack.push(TOKEN_TYPES.BLOCK_COMMENT);
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} else if (character === '/' && isRegexp(state.history)) {
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state.stack.push(TOKEN_TYPES.REGEXP);
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// N.B. if the next character turns out to be a `*` or a `/`
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// then this isn't actually a regexp
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state.regexpStart = true;
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} else if (character === '\'') {
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state.stack.push(TOKEN_TYPES.SINGLE_QUOTE);
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} else if (character === '"') {
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state.stack.push(TOKEN_TYPES.DOUBLE_QUOTE);
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} else if (character === '`') {
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state.stack.push(TOKEN_TYPES.TEMPLATE_QUOTE);
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}
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break;
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}
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if (!state.isComment() && !wasComment) {
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state.history = character + state.history;
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}
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state.lastChar = character; // store last character for ending block comments
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return state;
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}
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exports.defaultState = function () { return new State() };
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function State() {
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this.stack = [];
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this.regexpStart = false;
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this.escaped = false;
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this.hasDollar = false;
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this.src = '';
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this.history = ''
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this.lastChar = ''
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}
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State.prototype.current = function () {
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return this.stack[this.stack.length - 1];
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};
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State.prototype.isString = function () {
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return (
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this.current() === TOKEN_TYPES.SINGLE_QUOTE ||
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this.current() === TOKEN_TYPES.DOUBLE_QUOTE ||
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this.current() === TOKEN_TYPES.TEMPLATE_QUOTE
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);
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}
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State.prototype.isComment = function () {
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return this.current() === TOKEN_TYPES.LINE_COMMENT || this.current() === TOKEN_TYPES.BLOCK_COMMENT;
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}
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State.prototype.isNesting = function (opts) {
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if (
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opts && opts.ignoreLineComment &&
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this.stack.length === 1 && this.stack[0] === TOKEN_TYPES.LINE_COMMENT
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) {
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// if we are only inside a line comment, and line comments are ignored
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// don't count it as nesting
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return false;
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}
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return !!this.stack.length;
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}
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function matches(str, matcher, i) {
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if (objIsRegex(matcher)) {
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return matcher.test(str.substr(i || 0));
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} else {
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return str.substr(i || 0, matcher.length) === matcher;
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}
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}
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exports.isPunctuator = isPunctuator
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function isPunctuator(c) {
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if (!c) return true; // the start of a string is a punctuator
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var code = c.charCodeAt(0)
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switch (code) {
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case 46: // . dot
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case 40: // ( open bracket
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case 41: // ) close bracket
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case 59: // ; semicolon
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case 44: // , comma
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case 123: // { open curly brace
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case 125: // } close curly brace
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case 91: // [
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case 93: // ]
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case 58: // :
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case 63: // ?
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case 126: // ~
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case 37: // %
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case 38: // &
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case 42: // *:
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case 43: // +
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case 45: // -
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case 47: // /
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case 60: // <
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case 62: // >
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case 94: // ^
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case 124: // |
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case 33: // !
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case 61: // =
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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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exports.isKeyword = isKeyword
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function isKeyword(id) {
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return (id === 'if') || (id === 'in') || (id === 'do') || (id === 'var') || (id === 'for') || (id === 'new') ||
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(id === 'try') || (id === 'let') || (id === 'this') || (id === 'else') || (id === 'case') ||
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(id === 'void') || (id === 'with') || (id === 'enum') || (id === 'while') || (id === 'break') || (id === 'catch') ||
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(id === 'throw') || (id === 'const') || (id === 'yield') || (id === 'class') || (id === 'super') ||
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(id === 'return') || (id === 'typeof') || (id === 'delete') || (id === 'switch') || (id === 'export') ||
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(id === 'import') || (id === 'default') || (id === 'finally') || (id === 'extends') || (id === 'function') ||
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(id === 'continue') || (id === 'debugger') || (id === 'package') || (id === 'private') || (id === 'interface') ||
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(id === 'instanceof') || (id === 'implements') || (id === 'protected') || (id === 'public') || (id === 'static');
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}
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function isRegexp(history) {
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//could be start of regexp or divide sign
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history = history.replace(/^\s*/, '');
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//unless its an `if`, `while`, `for` or `with` it's a divide, so we assume it's a divide
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if (history[0] === ')') return false;
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//unless it's a function expression, it's a regexp, so we assume it's a regexp
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if (history[0] === '}') return true;
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//any punctuation means it's a regexp
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if (isPunctuator(history[0])) return true;
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//if the last thing was a keyword then it must be a regexp (e.g. `typeof /foo/`)
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if (/^\w+\b/.test(history) && isKeyword(/^\w+\b/.exec(history)[0].split('').reverse().join(''))) return true;
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return false;
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}
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