utils.ts

import type { RuleContext } from '../../types'
import semver from 'semver'
import type { AST as JSONAST } from 'jsonc-eslint-parser'
import type { AST as YAMLAST } from 'yaml-eslint-parser'

export const NodeTypes = {
  Resource: 0,
  Plural: 1,
  Message: 2,
  Text: 3,
  Named: 4,
  List: 5,
  Linked: 6,
  LinkedKey: 7,
  LinkedModifier: 8,
  Literal: 9
} as const

export type MessageSyntaxVersions = {
  v8: boolean
  v9: boolean
  isNotSet: boolean
  reportIfMissingSetting: () => boolean
}

/** @type {Set<RuleContext>} */
const puttedSettingsError = new WeakSet<RuleContext>()

export function getMessageSyntaxVersions(
  context: RuleContext
): MessageSyntaxVersions {
  const { settings } = context
  const messageSyntaxVersion =
    settings['vue-i18n'] && settings['vue-i18n'].messageSyntaxVersion

  if (!messageSyntaxVersion) {
    return {
      v8: true,
      v9: true,
      isNotSet: true,
      reportIfMissingSetting: () => {
        if (!puttedSettingsError.has(context)) {
          const ruleName = context.id
          context.report({
            loc: { line: 1, column: 0 },
            message: `If you want to use '${ruleName}' rule, you need to set 'messageSyntaxVersion' at 'settings'. See the 'eslint-plugin-vue-i18n' documentation`
          })
          puttedSettingsError.add(context)
        }
        return true
      }
    }
  }
  const range = new semver.Range(messageSyntaxVersion)
  return {
    v8: semver.intersects(range, '^8.0.0 || <=8.0.0'),
    v9: semver.intersects(range, '>=9.0.0-0'),
    isNotSet: false,
    reportIfMissingSetting: () => false
  }
}

export function getReportIndex(
  node: JSONAST.JSONNode | YAMLAST.YAMLNode,
  stringOffset: number
): number | null {
  if (node.type === 'JSONLiteral' || node.type === 'JSONTemplateLiteral') {
    const stringCode =
      node.type === 'JSONLiteral'
        ? node.raw.slice(1, -1)
        : node.quasis[0].value.raw
    return (
      node.range[0] +
      1 /* quote*/ +
      getJSONStringOffset(stringCode, stringOffset)
    )
  }
  if (node.type === 'YAMLScalar') {
    if (node.style === 'single-quoted' || node.style === 'double-quoted') {
      const stringCode = node.raw.slice(1, -1)
      return (
        node.range[0] +
        1 /* quote*/ +
        (node.style === 'single-quoted'
          ? getYAMLSingleQuotedStringOffset(stringCode, stringOffset)
          : getYAMLDoubleQuotedStringOffset(stringCode, stringOffset))
      )
    }
    if (node.style === 'plain') {
      const stringCode = node.raw
      return node.range[0] + getYAMLPlainStringOffset(stringCode, stringOffset)
    }
  }
  // Unknown location
  return null
}

export function getJSONStringOffset(
  code: string,
  stringOffset: number
): number {
  let offset = stringOffset
  let codeIndex = 0
  let char
  while ((char = code[codeIndex++]) && offset > 0) {
    if (char === '\\') {
      char = code[codeIndex++]
      if (char === 'x') {
        // Hexadecimal escape sequences
        codeIndex += 2
      } else if (char === 'u') {
        char = code[codeIndex++]
        if (char === '{') {
          // Unicode code point escapes
          let pointStr = ''
          while ((char = code[codeIndex++]) && char !== '}') {
            pointStr += char
          }
          let point = parseInt(pointStr, 16)
          while (point > 0xffff) {
            offset--
            point >>= 16
          }
        } else {
          // Unicode escape sequences
          codeIndex += 3
        }
      } else if (char >= '0' && char <= '9') {
        let octalStr = code.substr(codeIndex - 1, 3).match(/^[0-7]+/u)![0]
        const octal = parseInt(octalStr, 8)
        if (octal > 255) {
          octalStr = octalStr.slice(0, -1)
        }
        if (octalStr.length >= 2) {
          codeIndex += octalStr.length - 1
        }
      }
    }
    offset--
  }
  return Math.min(codeIndex - 1, code.length)
}

export function getYAMLSingleQuotedStringOffset(
  code: string,
  stringOffset: number
): number {
  let offset = stringOffset
  let codeIndex = 0
  let char
  let lineFolding = 0
  while ((char = code[codeIndex++]) && offset > 0) {
    if (char === "'" && code[codeIndex] === "'") {
      codeIndex++
      lineFolding = 0
    } else if (isSpaceOrEOL(char)) {
      let nextCodeIndex = processMaybeLineFolding(code, codeIndex - 1)
      if (nextCodeIndex != null) {
        if (lineFolding === 0 && isEOL(code[nextCodeIndex])) {
          nextCodeIndex = processMaybeLineFolding(code, nextCodeIndex)!
        }
        codeIndex = nextCodeIndex
        lineFolding++
      } else {
        lineFolding = 0
      }
    } else {
      lineFolding = 0
    }
    offset--
  }
  return Math.min(codeIndex - 1, code.length)
}

export function getYAMLDoubleQuotedStringOffset(
  code: string,
  stringOffset: number
): number {
  let offset = stringOffset
  let codeIndex = 0
  let char
  let lineFolding = 0
  while ((char = code[codeIndex++]) && offset > 0) {
    if (char === '\\') {
      char = code[codeIndex++]
      if (char === 'x') {
        // Escaped 8-bit Unicode character.
        codeIndex += 2
      } else if (char === 'u') {
        // Escaped 16-bit Unicode character.
        codeIndex += 4
      } else if (char === 'U') {
        // Escaped 32-bit Unicode character.
        if (code.substr(codeIndex, 4) !== '0000') {
          offset--
        }
        codeIndex += 8
      } else if (isEOL(char)) {
        const nextCodeIndex = processMaybeLineFolding(code, codeIndex - 1)
        if (nextCodeIndex != null) {
          // escape line break
          codeIndex = nextCodeIndex + 1

          if (code[nextCodeIndex] === '\\') {
            // If the next char is escape, it back.
            codeIndex--
            lineFolding = 0
            // Do the next process without moving the offset.
            continue
          }
        }
      }
      lineFolding = 0
    } else if (isSpaceOrEOL(char)) {
      let nextCodeIndex = processMaybeLineFolding(code, codeIndex - 1)
      if (nextCodeIndex != null) {
        if (lineFolding === 0 && isEOL(code[nextCodeIndex])) {
          nextCodeIndex = processMaybeLineFolding(code, nextCodeIndex)!
        }
        codeIndex = nextCodeIndex
        lineFolding++
      } else {
        lineFolding = 0
      }
    } else {
      lineFolding = 0
    }
    offset--
  }
  return Math.min(codeIndex - 1, code.length)
}

export function getYAMLPlainStringOffset(
  code: string,
  stringOffset: number
): number {
  let offset = stringOffset
  let codeIndex = 0
  let char
  let lineFolding = 0
  while ((char = code[codeIndex++]) && offset > 0) {
    if (isSpaceOrEOL(char)) {
      let nextCodeIndex = processMaybeLineFolding(code, codeIndex - 1)
      if (nextCodeIndex != null) {
        if (lineFolding === 0 && isEOL(code[nextCodeIndex])) {
          nextCodeIndex = processMaybeLineFolding(code, nextCodeIndex)!
        }
        codeIndex = nextCodeIndex
        lineFolding++
      } else {
        lineFolding = 0
      }
    } else {
      lineFolding = 0
    }
    offset--
  }
  return Math.min(codeIndex - 1, code.length)
}

function isSpace(char: string) {
  return char === ' ' || char === '\t'
}
function isSpaceOrEOL(char: string) {
  return isSpace(char) || isEOL(char)
}
function isEOL(char: string) {
  return char === '\n' || char === '\r'
}

function processMaybeLineFolding(code: string, spaceIndex: number) {
  let codeIndex = spaceIndex
  let char
  let hasNewline = false
  while ((char = code[codeIndex++])) {
    if (isEOL(char)) {
      if (hasNewline) {
        return codeIndex - 1
      }
      if (char === '\r' && code[codeIndex] === '\n') {
        codeIndex++
      }
      hasNewline = true
    } else if (!isSpace(char)) {
      if (hasNewline) {
        // to space
        return codeIndex - 1
      } else {
        // no line folding
        return null
      }
    }
    // space
  }
  if (hasNewline) {
    // to space
    return codeIndex - 1
  } else {
    // no line folding
    return null
  }
}