mirror of
https://github.com/thangisme/notes.git
synced 2024-06-12 05:40:42 +00:00
307 lines
9.9 KiB
JavaScript
307 lines
9.9 KiB
JavaScript
"use strict"
|
|
|
|
const configurationError = require("./configurationError")
|
|
const isSingleLineString = require("./isSingleLineString")
|
|
const isWhitespace = require("./isWhitespace")
|
|
|
|
/**
|
|
* Create a whitespaceChecker, which exposes the following functions:
|
|
* - `before()`
|
|
* - `beforeAllowingIndentation()`
|
|
* - `after()`
|
|
* - `afterOneOnly()`
|
|
*
|
|
* @param {"space"|"newline"} targetWhitespace - This is a keyword instead
|
|
* of the actual character (e.g. " ") in order to accommodate
|
|
* different styles of newline ("\n" vs "\r\n")
|
|
* @param {
|
|
* "always"|"never"
|
|
* |"always-single-line"|"always-multi-line"
|
|
* | "never-single-line"|"never-multi-line"
|
|
* } expectation
|
|
* @param {object} messages - An object of message functions;
|
|
* calling `before*()` or `after*()` and the `expectation` that is passed
|
|
* determines which message functions are required
|
|
* @param {function} [messages.exectedBefore]
|
|
* @param {function} [messages.rejectedBefore]
|
|
* @param {function} [messages.expectedAfter]
|
|
* @param {function} [messages.rejectedAfter]
|
|
* @param {function} [messages.expectedBeforeSingleLine]
|
|
* @param {function} [messages.rejectedBeforeSingleLine]
|
|
* @param {function} [messages.expectedBeforeMultiLine]
|
|
* @param {function} [messages.rejectedBeforeMultiLine]
|
|
* @return {object} The checker, with its exposed checking functions
|
|
*/
|
|
module.exports = function (
|
|
targetWhitespace/*: "space" | "newline"*/,
|
|
expectation/*: "always" | "never" | "always-single-line"
|
|
| "always-multi-line" | "never-single-line"|"never-multi-line"*/,
|
|
messages/*: Object*/
|
|
)/*: {
|
|
before: Function,
|
|
beforeAllowingIndentation: Function,
|
|
after: Function,
|
|
afterOneOnly: Function
|
|
}*/ {
|
|
// Keep track of active arguments in order to avoid passing
|
|
// too much stuff around, making signatures long and confusing.
|
|
// This variable gets reset anytime a checking function is called.
|
|
let activeArgs
|
|
|
|
/**
|
|
* Check for whitespace *before* a character.
|
|
*
|
|
* @param {object} args - Named arguments object
|
|
* @param {string} args.source - The source string
|
|
* @param {number} args.index - The index of the character to check before
|
|
* @param {function} args.err - If a violation is found, this callback
|
|
* will be invoked with the relevant warning message.
|
|
* Typically this callback will report() the violation.
|
|
* @param {function} args.errTarget - If a violation is found, this string
|
|
* will be sent to the relevant warning message.
|
|
* @param {string} [args.lineCheckStr] - Single- and multi-line checkers
|
|
* will use this string to determine whether they should proceed,
|
|
* i.e. if this string is one line only, single-line checkers will check,
|
|
* multi-line checkers will ignore.
|
|
* If none is passed, they will use `source`.
|
|
* @param {boolean} [args.onlyOneChar=false] - Only check *one* character before.
|
|
* By default, "always-*" checks will look for the `targetWhitespace` one
|
|
* before and then ensure there is no whitespace two before. This option
|
|
* bypasses that second check.
|
|
* @param {boolean} [args.allowIndentation=false] - Allow arbitrary indentation
|
|
* between the `targetWhitespace` (almost definitely a newline) and the `index`.
|
|
* With this option, the checker will see if a newline *begins* the whitespace before
|
|
* the `index`.
|
|
*/
|
|
function before(args) {
|
|
const source = args.source
|
|
const index = args.index
|
|
const err = args.err
|
|
const errTarget = args.errTarget
|
|
const lineCheckStr = args.lineCheckStr
|
|
const onlyOneChar = args.onlyOneChar === undefined ? false : args.onlyOneChar
|
|
const allowIndentation = args.allowIndentation === undefined ? false : args.allowIndentation
|
|
|
|
activeArgs = { source, index, err, errTarget, onlyOneChar, allowIndentation }
|
|
switch (expectation) {
|
|
case "always":
|
|
expectBefore()
|
|
break
|
|
case "never":
|
|
rejectBefore()
|
|
break
|
|
case "always-single-line":
|
|
if (!isSingleLineString(lineCheckStr || source)) {
|
|
return
|
|
}
|
|
expectBefore(messages.expectedBeforeSingleLine)
|
|
break
|
|
case "never-single-line":
|
|
if (!isSingleLineString(lineCheckStr || source)) {
|
|
return
|
|
}
|
|
rejectBefore(messages.rejectedBeforeSingleLine)
|
|
break
|
|
case "always-multi-line":
|
|
if (isSingleLineString(lineCheckStr || source)) {
|
|
return
|
|
}
|
|
expectBefore(messages.expectedBeforeMultiLine)
|
|
break
|
|
case "never-multi-line":
|
|
if (isSingleLineString(lineCheckStr || source)) {
|
|
return
|
|
}
|
|
rejectBefore(messages.rejectedBeforeMultiLine)
|
|
break
|
|
default:
|
|
throw configurationError(`Unknown expectation "${expectation}"`)
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check for whitespace *after* a character.
|
|
*
|
|
* Parameters are pretty much the same as for `before()`, above, just substitute
|
|
* the word "after" for "before".
|
|
*/
|
|
function after(args) {
|
|
const source = args.source
|
|
const index = args.index
|
|
const err = args.err
|
|
const errTarget = args.errTarget
|
|
const lineCheckStr = args.lineCheckStr
|
|
const onlyOneChar = args.onlyOneChar === undefined ? false : args.onlyOneChar
|
|
|
|
activeArgs = { source, index, err, errTarget, onlyOneChar }
|
|
switch (expectation) {
|
|
case "always":
|
|
expectAfter()
|
|
break
|
|
case "never":
|
|
rejectAfter()
|
|
break
|
|
case "always-single-line":
|
|
if (!isSingleLineString(lineCheckStr || source)) {
|
|
return
|
|
}
|
|
expectAfter(messages.expectedAfterSingleLine)
|
|
break
|
|
case "never-single-line":
|
|
if (!isSingleLineString(lineCheckStr || source)) {
|
|
return
|
|
}
|
|
rejectAfter(messages.rejectedAfterSingleLine)
|
|
break
|
|
case "always-multi-line":
|
|
if (isSingleLineString(lineCheckStr || source)) {
|
|
return
|
|
}
|
|
expectAfter(messages.expectedAfterMultiLine)
|
|
break
|
|
case "never-multi-line":
|
|
if (isSingleLineString(lineCheckStr || source)) {
|
|
return
|
|
}
|
|
rejectAfter(messages.rejectedAfterMultiLine)
|
|
break
|
|
default:
|
|
throw configurationError(`Unknown expectation "${expectation}"`)
|
|
}
|
|
}
|
|
|
|
function beforeAllowingIndentation(obj) {
|
|
before(Object.assign({}, obj, { allowIndentation: true }))
|
|
}
|
|
|
|
function expectBefore() {
|
|
const messageFunc = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : messages.expectedBefore
|
|
|
|
if (activeArgs.allowIndentation) {
|
|
expectBeforeAllowingIndentation(messageFunc)
|
|
return
|
|
}
|
|
|
|
const _activeArgs = activeArgs
|
|
const source = _activeArgs.source,
|
|
index = _activeArgs.index
|
|
|
|
const oneCharBefore = source[index - 1]
|
|
const twoCharsBefore = source[index - 2]
|
|
|
|
if (!isValue(oneCharBefore)) {
|
|
return
|
|
}
|
|
|
|
if (targetWhitespace === "space" && oneCharBefore === " ") {
|
|
if (activeArgs.onlyOneChar || !isWhitespace(twoCharsBefore)) {
|
|
return
|
|
}
|
|
}
|
|
|
|
activeArgs.err(messageFunc(activeArgs.errTarget ? activeArgs.errTarget : source[index]))
|
|
}
|
|
|
|
function expectBeforeAllowingIndentation() {
|
|
const messageFunc = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : messages.expectedBefore
|
|
const _activeArgs2 = activeArgs
|
|
const source = _activeArgs2.source,
|
|
index = _activeArgs2.index,
|
|
err = _activeArgs2.err
|
|
|
|
const expectedChar = function () {
|
|
if (targetWhitespace === "newline") {
|
|
return "\n"
|
|
}
|
|
}()
|
|
let i = index - 1
|
|
while (source[i] !== expectedChar) {
|
|
if (source[i] === "\t" || source[i] === " ") {
|
|
i--
|
|
continue
|
|
}
|
|
err(messageFunc(activeArgs.errTarget ? activeArgs.errTarget : source[index]))
|
|
return
|
|
}
|
|
}
|
|
|
|
function rejectBefore() {
|
|
const messageFunc = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : messages.rejectedBefore
|
|
const _activeArgs3 = activeArgs
|
|
const source = _activeArgs3.source,
|
|
index = _activeArgs3.index
|
|
|
|
const oneCharBefore = source[index - 1]
|
|
|
|
if (isValue(oneCharBefore) && isWhitespace(oneCharBefore)) {
|
|
activeArgs.err(messageFunc(activeArgs.errTarget ? activeArgs.errTarget : source[index]))
|
|
}
|
|
}
|
|
|
|
function afterOneOnly(obj) {
|
|
after(Object.assign({}, obj, { onlyOneChar: true }))
|
|
}
|
|
|
|
function expectAfter() {
|
|
const messageFunc = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : messages.expectedAfter
|
|
const _activeArgs4 = activeArgs
|
|
const source = _activeArgs4.source,
|
|
index = _activeArgs4.index
|
|
|
|
const oneCharAfter = source[index + 1]
|
|
const twoCharsAfter = source[index + 2]
|
|
|
|
if (!isValue(oneCharAfter)) {
|
|
return
|
|
}
|
|
|
|
if (targetWhitespace === "newline") {
|
|
// If index is followed by a Windows CR-LF ...
|
|
if (oneCharAfter === "\r" && twoCharsAfter === "\n") {
|
|
if (activeArgs.onlyOneChar || !isWhitespace(source[index + 3])) {
|
|
return
|
|
}
|
|
}
|
|
|
|
// If index is followed by a Unix LF ...
|
|
if (oneCharAfter === "\n") {
|
|
if (activeArgs.onlyOneChar || !isWhitespace(twoCharsAfter)) {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
if (targetWhitespace === "space" && oneCharAfter === " ") {
|
|
if (activeArgs.onlyOneChar || !isWhitespace(twoCharsAfter)) {
|
|
return
|
|
}
|
|
}
|
|
|
|
activeArgs.err(messageFunc(activeArgs.errTarget ? activeArgs.errTarget : source[index]))
|
|
}
|
|
|
|
function rejectAfter() {
|
|
const messageFunc = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : messages.rejectedAfter
|
|
const _activeArgs5 = activeArgs
|
|
const source = _activeArgs5.source,
|
|
index = _activeArgs5.index
|
|
|
|
const oneCharAfter = source[index + 1]
|
|
|
|
if (isValue(oneCharAfter) && isWhitespace(oneCharAfter)) {
|
|
activeArgs.err(messageFunc(activeArgs.errTarget ? activeArgs.errTarget : source[index]))
|
|
}
|
|
}
|
|
|
|
return {
|
|
before,
|
|
beforeAllowingIndentation,
|
|
after,
|
|
afterOneOnly,
|
|
}
|
|
}
|
|
|
|
function isValue(x) {
|
|
return x !== undefined && x !== null
|
|
}
|