// This is a TextMate grammar distributed by `starry-night`.
// This grammar is licensed `mit`.
// See <https://github.com/wooorm/starry-night> for more info.
/**
 * @import {Grammar} from '@wooorm/starry-night'
 */

/** @type {Grammar} */
const grammar = {
  extensions: ['.metta'],
  names: ['metta'],
  patterns: [
    {include: '#comment'},
    {include: '#string'},
    {include: '#number'},
    {include: '#variable'},
    {include: '#space-atom'},
    {include: '#operator'},
    {include: '#keyword'},
    {include: '#builtin-function'},
    {include: '#arithmetic'},
    {include: '#builtin-type'},
    {include: '#boolean'},
    {include: '#punctuation'},
    {include: '#function-call'}
  ],
  repository: {
    arithmetic: {
      match: '(?<=[()\\s])(\\+|-|\\*|/|%|<|>|<=|>=|==)(?=[()\\s])',
      name: 'support.function.arithmetic.metta'
    },
    boolean: {
      match: '(?<=[()\\s])(True|False)(?=[()\\s])',
      name: 'constant.language.boolean.metta'
    },
    'builtin-function': {
      match:
        '(?<=[()\\s])(get-type|get-metatype|collapse|superpose|assertEqual|assertEqualToResult|add-atom|remove-atom|get-atoms|new-space|car-atom|cdr-atom|cons-atom|nop|empty|Error|trace!|println!|sealed|apply|chain|unify)(?=[()\\s])',
      name: 'support.function.builtin.metta'
    },
    'builtin-type': {
      match:
        '(?<=[()\\s])(Type|Atom|Symbol|Expression|Variable|Grounded|Number|Bool|String|%Undefined%)(?=[()\\s])',
      name: 'support.type.builtin.metta'
    },
    comment: {match: ';[^\n\r]*', name: 'comment.line.semicolon.metta'},
    'function-call': {
      match: '(?<=\\()[a-zA-Z_][a-zA-Z0-9_!?-]*',
      name: 'entity.name.function.metta'
    },
    keyword: {
      match:
        '(?<=[()\\s])(match|let\\*?|if|case|import!|include|bind!|pragma!|function|return)(?=[()\\s])',
      name: 'keyword.control.metta'
    },
    number: {
      match:
        '(?<=[()\\s]|^)-?(?:0|[1-9]\\d*)(?:\\.\\d+)?(?:[eE][+-]?\\d+)?(?=[()\\s]|$)',
      name: 'constant.numeric.metta'
    },
    operator: {
      patterns: [
        {
          match: '(?<=[\\s(]|^)!(?=[\\s(])',
          name: 'keyword.operator.evaluation.metta'
        },
        {
          match: '(?<=[\\s(])=(?=[\\s()])',
          name: 'keyword.operator.definition.metta'
        },
        {
          match: '(?<=[\\s(]):(?=[\\s()])',
          name: 'keyword.operator.type-annotation.metta'
        },
        {match: '->', name: 'keyword.operator.arrow.metta'}
      ]
    },
    punctuation: {
      patterns: [
        {match: '\\(', name: 'punctuation.definition.list.begin.metta'},
        {match: '\\)', name: 'punctuation.definition.list.end.metta'}
      ]
    },
    'space-atom': {
      match: '&[a-zA-Z_][a-zA-Z0-9_-]*',
      name: 'variable.language.self.metta'
    },
    string: {
      begin: '"',
      beginCaptures: {0: {name: 'punctuation.definition.string.begin.metta'}},
      end: '"',
      endCaptures: {0: {name: 'punctuation.definition.string.end.metta'}},
      name: 'string.quoted.double.metta',
      patterns: [{match: '\\\\.', name: 'constant.character.escape.metta'}]
    },
    variable: {match: '\\$[^()\\s";]+', name: 'variable.other.metta'}
  },
  scopeName: 'source.metta'
}

export default grammar