Page MenuHomec4science
Files F122575650

scan.js
No OneTemporary
Actions

File Metadata

Created
Sun, Jul 20, 15:45

scan.js
View Options

'use strict';
const utils = require('./utils');
const {
CHAR_ASTERISK, /* * */
CHAR_AT, /* @ */
CHAR_BACKWARD_SLASH, /* \ */
CHAR_COMMA, /* , */
CHAR_DOT, /* . */
CHAR_EXCLAMATION_MARK, /* ! */
CHAR_FORWARD_SLASH, /* / */
CHAR_LEFT_CURLY_BRACE, /* { */
CHAR_LEFT_PARENTHESES, /* ( */
CHAR_LEFT_SQUARE_BRACKET, /* [ */
CHAR_PLUS, /* + */
CHAR_QUESTION_MARK, /* ? */
CHAR_RIGHT_CURLY_BRACE, /* } */
CHAR_RIGHT_PARENTHESES, /* ) */
CHAR_RIGHT_SQUARE_BRACKET /* ] */
} = require('./constants');
const isPathSeparator = code => {
return code === CHAR_FORWARD_SLASH || code === CHAR_BACKWARD_SLASH;
};
const depth = token => {
if (token.isPrefix !== true) {
token.depth = token.isGlobstar ? Infinity : 1;
}
};
/**
* Quickly scans a glob pattern and returns an object with a handful of
* useful properties, like `isGlob`, `path` (the leading non-glob, if it exists),
* `glob` (the actual pattern), `negated` (true if the path starts with `!` but not
* with `!(`) and `negatedExtglob` (true if the path starts with `!(`).
*
* ```js
* const pm = require('picomatch');
* console.log(pm.scan('foo/bar/*.js'));
* { isGlob: true, input: 'foo/bar/*.js', base: 'foo/bar', glob: '*.js' }
* ```
* @param {String} `str`
* @param {Object} `options`
* @return {Object} Returns an object with tokens and regex source string.
* @api public
*/
const scan = (input, options) => {
const opts = options || {};
const length = input.length - 1;
const scanToEnd = opts.parts === true || opts.scanToEnd === true;
const slashes = [];
const tokens = [];
const parts = [];
let str = input;
let index = -1;
let start = 0;
let lastIndex = 0;
let isBrace = false;
let isBracket = false;
let isGlob = false;
let isExtglob = false;
let isGlobstar = false;
let braceEscaped = false;
let backslashes = false;
let negated = false;
let negatedExtglob = false;
let finished = false;
let braces = 0;
let prev;
let code;
let token = { value: '', depth: 0, isGlob: false };
const eos = () => index >= length;
const peek = () => str.charCodeAt(index + 1);
const advance = () => {
prev = code;
return str.charCodeAt(++index);
};
while (index < length) {
code = advance();
let next;
if (code === CHAR_BACKWARD_SLASH) {
backslashes = token.backslashes = true;
code = advance();
if (code === CHAR_LEFT_CURLY_BRACE) {
braceEscaped = true;
}
continue;
}
if (braceEscaped === true || code === CHAR_LEFT_CURLY_BRACE) {
braces++;
while (eos() !== true && (code = advance())) {
if (code === CHAR_BACKWARD_SLASH) {
backslashes = token.backslashes = true;
advance();
continue;
}
if (code === CHAR_LEFT_CURLY_BRACE) {
braces++;
continue;
}
if (braceEscaped !== true && code === CHAR_DOT && (code = advance()) === CHAR_DOT) {
isBrace = token.isBrace = true;
isGlob = token.isGlob = true;
finished = true;
if (scanToEnd === true) {
continue;
}
break;
}
if (braceEscaped !== true && code === CHAR_COMMA) {
isBrace = token.isBrace = true;
isGlob = token.isGlob = true;
finished = true;
if (scanToEnd === true) {
continue;
}
break;
}
if (code === CHAR_RIGHT_CURLY_BRACE) {
braces--;
if (braces === 0) {
braceEscaped = false;
isBrace = token.isBrace = true;
finished = true;
break;
}
}
}
if (scanToEnd === true) {
continue;
}
break;
}
if (code === CHAR_FORWARD_SLASH) {
slashes.push(index);
tokens.push(token);
token = { value: '', depth: 0, isGlob: false };
if (finished === true) continue;
if (prev === CHAR_DOT && index === (start + 1)) {
start += 2;
continue;
}
lastIndex = index + 1;
continue;
}
if (opts.noext !== true) {
const isExtglobChar = code === CHAR_PLUS
|| code === CHAR_AT
|| code === CHAR_ASTERISK
|| code === CHAR_QUESTION_MARK
|| code === CHAR_EXCLAMATION_MARK;
if (isExtglobChar === true && peek() === CHAR_LEFT_PARENTHESES) {
isGlob = token.isGlob = true;
isExtglob = token.isExtglob = true;
finished = true;
if (code === CHAR_EXCLAMATION_MARK && index === start) {
negatedExtglob = true;
}
if (scanToEnd === true) {
while (eos() !== true && (code = advance())) {
if (code === CHAR_BACKWARD_SLASH) {
backslashes = token.backslashes = true;
code = advance();
continue;
}
if (code === CHAR_RIGHT_PARENTHESES) {
isGlob = token.isGlob = true;
finished = true;
break;
}
}
continue;
}
break;
}
}
if (code === CHAR_ASTERISK) {
if (prev === CHAR_ASTERISK) isGlobstar = token.isGlobstar = true;
isGlob = token.isGlob = true;
finished = true;
if (scanToEnd === true) {
continue;
}
break;
}
if (code === CHAR_QUESTION_MARK) {
isGlob = token.isGlob = true;
finished = true;
if (scanToEnd === true) {
continue;
}
break;
}
if (code === CHAR_LEFT_SQUARE_BRACKET) {
while (eos() !== true && (next = advance())) {
if (next === CHAR_BACKWARD_SLASH) {
backslashes = token.backslashes = true;
advance();
continue;
}
if (next === CHAR_RIGHT_SQUARE_BRACKET) {
isBracket = token.isBracket = true;
isGlob = token.isGlob = true;
finished = true;
break;
}
}
if (scanToEnd === true) {
continue;
}
break;
}
if (opts.nonegate !== true && code === CHAR_EXCLAMATION_MARK && index === start) {
negated = token.negated = true;
start++;
continue;
}
if (opts.noparen !== true && code === CHAR_LEFT_PARENTHESES) {
isGlob = token.isGlob = true;
if (scanToEnd === true) {
while (eos() !== true && (code = advance())) {
if (code === CHAR_LEFT_PARENTHESES) {
backslashes = token.backslashes = true;
code = advance();
continue;
}
if (code === CHAR_RIGHT_PARENTHESES) {
finished = true;
break;
}
}
continue;
}
break;
}
if (isGlob === true) {
finished = true;
if (scanToEnd === true) {
continue;
}
break;
}
}
if (opts.noext === true) {
isExtglob = false;
isGlob = false;
}
let base = str;
let prefix = '';
let glob = '';
if (start > 0) {
prefix = str.slice(0, start);
str = str.slice(start);
lastIndex -= start;
}
if (base && isGlob === true && lastIndex > 0) {
base = str.slice(0, lastIndex);
glob = str.slice(lastIndex);
} else if (isGlob === true) {
base = '';
glob = str;
} else {
base = str;
}
if (base && base !== '' && base !== '/' && base !== str) {
if (isPathSeparator(base.charCodeAt(base.length - 1))) {
base = base.slice(0, -1);
}
}
if (opts.unescape === true) {
if (glob) glob = utils.removeBackslashes(glob);
if (base && backslashes === true) {
base = utils.removeBackslashes(base);
}
}
const state = {
prefix,
input,
start,
base,
glob,
isBrace,
isBracket,
isGlob,
isExtglob,
isGlobstar,
negated,
negatedExtglob
};
if (opts.tokens === true) {
state.maxDepth = 0;
if (!isPathSeparator(code)) {
tokens.push(token);
}
state.tokens = tokens;
}
if (opts.parts === true || opts.tokens === true) {
let prevIndex;
for (let idx = 0; idx < slashes.length; idx++) {
const n = prevIndex ? prevIndex + 1 : start;
const i = slashes[idx];
const value = input.slice(n, i);
if (opts.tokens) {
if (idx === 0 && start !== 0) {
tokens[idx].isPrefix = true;
tokens[idx].value = prefix;
} else {
tokens[idx].value = value;
}
depth(tokens[idx]);
state.maxDepth += tokens[idx].depth;
}
if (idx !== 0 || value !== '') {
parts.push(value);
}
prevIndex = i;
}
if (prevIndex && prevIndex + 1 < input.length) {
const value = input.slice(prevIndex + 1);
parts.push(value);
if (opts.tokens) {
tokens[tokens.length - 1].value = value;
depth(tokens[tokens.length - 1]);
state.maxDepth += tokens[tokens.length - 1].depth;
}
}
state.slashes = slashes;
state.parts = parts;
}
return state;
};
module.exports = scan;

Event Timeline

c4science · Help