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212 lines (166 loc) · 7.51 KB
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const {
MAX_SAFE_COMPONENT_LENGTH,
MAX_SAFE_BUILD_LENGTH,
MAX_LENGTH,
} = require('./constants')
const debug = require('./debug')
exports = module.exports = {}
// The actual regexps go on exports.re
const re = exports.re = []
const safeRe = exports.safeRe = []
const src = exports.src = []
const t = exports.t = {}
let R = 0
const LETTERDASHNUMBER = '[a-zA-Z0-9-]'
// Replace some greedy regex tokens to prevent regex dos issues. These regex are
// used internally via the safeRe object since all inputs in this library get
// normalized first to trim and collapse all extra whitespace. The original
// regexes are exported for userland consumption and lower level usage. A
// future breaking change could export the safer regex only with a note that
// all input should have extra whitespace removed.
const safeRegexReplacements = [
['\\s', 1],
['\\d', MAX_LENGTH],
[LETTERDASHNUMBER, MAX_SAFE_BUILD_LENGTH],
]
const makeSafeRegex = (value) => {
for (const [token, max] of safeRegexReplacements) {
value = value
.split(`${token}*`).join(`${token}{0,${max}}`)
.split(`${token}+`).join(`${token}{1,${max}}`)
}
return value
}
const createToken = (name, value, isGlobal) => {
const safe = makeSafeRegex(value)
const index = R++
debug(name, index, value)
t[name] = index
src[index] = value
re[index] = new RegExp(value, isGlobal ? 'g' : undefined)
safeRe[index] = new RegExp(safe, isGlobal ? 'g' : undefined)
}
// The following Regular Expressions can be used for tokenizing,
// validating, and parsing SemVer version strings.
// ## Numeric Identifier
// A single `0`, or a non-zero digit followed by zero or more digits.
createToken('NUMERICIDENTIFIER', '0|[1-9]\\d*')
createToken('NUMERICIDENTIFIERLOOSE', '\\d+')
// ## Non-numeric Identifier
// Zero or more digits, followed by a letter or hyphen, and then zero or
// more letters, digits, or hyphens.
createToken('NONNUMERICIDENTIFIER', `\\d*[a-zA-Z-]${LETTERDASHNUMBER}*`)
// ## Main Version
// Three dot-separated numeric identifiers.
createToken('MAINVERSION', `(${src[t.NUMERICIDENTIFIER]})\\.` +
`(${src[t.NUMERICIDENTIFIER]})\\.` +
`(${src[t.NUMERICIDENTIFIER]})`)
createToken('MAINVERSIONLOOSE', `(${src[t.NUMERICIDENTIFIERLOOSE]})\\.` +
`(${src[t.NUMERICIDENTIFIERLOOSE]})\\.` +
`(${src[t.NUMERICIDENTIFIERLOOSE]})`)
// ## Pre-release Version Identifier
// A numeric identifier, or a non-numeric identifier.
createToken('PRERELEASEIDENTIFIER', `(?:${src[t.NUMERICIDENTIFIER]
}|${src[t.NONNUMERICIDENTIFIER]})`)
createToken('PRERELEASEIDENTIFIERLOOSE', `(?:${src[t.NUMERICIDENTIFIERLOOSE]
}|${src[t.NONNUMERICIDENTIFIER]})`)
// ## Pre-release Version
// Hyphen, followed by one or more dot-separated pre-release version
// identifiers.
createToken('PRERELEASE', `(?:-(${src[t.PRERELEASEIDENTIFIER]
}(?:\\.${src[t.PRERELEASEIDENTIFIER]})*))`)
createToken('PRERELEASELOOSE', `(?:-?(${src[t.PRERELEASEIDENTIFIERLOOSE]
}(?:\\.${src[