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  1. /**
  2. * @fileoverview Rule to control spacing within function calls
  3. * @author Matt DuVall <http://www.mattduvall.com>
  4. */
  5. "use strict";
  6. //------------------------------------------------------------------------------
  7. // Requirements
  8. //------------------------------------------------------------------------------
  9. const astUtils = require("../util/ast-utils");
  10. //------------------------------------------------------------------------------
  11. // Rule Definition
  12. //------------------------------------------------------------------------------
  13. module.exports = {
  14. meta: {
  15. docs: {
  16. description: "require or disallow spacing between function identifiers and their invocations",
  17. category: "Stylistic Issues",
  18. recommended: false,
  19. url: "https://eslint.org/docs/rules/func-call-spacing"
  20. },
  21. fixable: "whitespace",
  22. schema: {
  23. anyOf: [
  24. {
  25. type: "array",
  26. items: [
  27. {
  28. enum: ["never"]
  29. }
  30. ],
  31. minItems: 0,
  32. maxItems: 1
  33. },
  34. {
  35. type: "array",
  36. items: [
  37. {
  38. enum: ["always"]
  39. },
  40. {
  41. type: "object",
  42. properties: {
  43. allowNewlines: {
  44. type: "boolean"
  45. }
  46. },
  47. additionalProperties: false
  48. }
  49. ],
  50. minItems: 0,
  51. maxItems: 2
  52. }
  53. ]
  54. },
  55. messages: {
  56. unexpected: "Unexpected newline between function name and paren.",
  57. missing: "Missing space between function name and paren."
  58. }
  59. },
  60. create(context) {
  61. const never = context.options[0] !== "always";
  62. const allowNewlines = !never && context.options[1] && context.options[1].allowNewlines;
  63. const sourceCode = context.getSourceCode();
  64. const text = sourceCode.getText();
  65. /**
  66. * Check if open space is present in a function name
  67. * @param {ASTNode} node node to evaluate
  68. * @returns {void}
  69. * @private
  70. */
  71. function checkSpacing(node) {
  72. const lastToken = sourceCode.getLastToken(node);
  73. const lastCalleeToken = sourceCode.getLastToken(node.callee);
  74. const parenToken = sourceCode.getFirstTokenBetween(lastCalleeToken, lastToken, astUtils.isOpeningParenToken);
  75. const prevToken = parenToken && sourceCode.getTokenBefore(parenToken);
  76. // Parens in NewExpression are optional
  77. if (!(parenToken && parenToken.range[1] < node.range[1])) {
  78. return;
  79. }
  80. const textBetweenTokens = text.slice(prevToken.range[1], parenToken.range[0]).replace(/\/\*.*?\*\//g, "");
  81. const hasWhitespace = /\s/.test(textBetweenTokens);
  82. const hasNewline = hasWhitespace && astUtils.LINEBREAK_MATCHER.test(textBetweenTokens);
  83. /*
  84. * never allowNewlines hasWhitespace hasNewline message
  85. * F F F F Missing space between function name and paren.
  86. * F F F T (Invalid `!hasWhitespace && hasNewline`)
  87. * F F T T Unexpected newline between function name and paren.
  88. * F F T F (OK)
  89. * F T T F (OK)
  90. * F T T T (OK)
  91. * F T F T (Invalid `!hasWhitespace && hasNewline`)
  92. * F T F F Missing space between function name and paren.
  93. * T T F F (Invalid `never && allowNewlines`)
  94. * T T F T (Invalid `!hasWhitespace && hasNewline`)
  95. * T T T T (Invalid `never && allowNewlines`)
  96. * T T T F (Invalid `never && allowNewlines`)
  97. * T F T F Unexpected space between function name and paren.
  98. * T F T T Unexpected space between function name and paren.
  99. * T F F T (Invalid `!hasWhitespace && hasNewline`)
  100. * T F F F (OK)
  101. *
  102. * T T Unexpected space between function name and paren.
  103. * F F Missing space between function name and paren.
  104. * F F T Unexpected newline between function name and paren.
  105. */
  106. if (never && hasWhitespace) {
  107. context.report({
  108. node,
  109. loc: lastCalleeToken.loc.start,
  110. messageId: "unexpected",
  111. fix(fixer) {
  112. /*
  113. * Only autofix if there is no newline
  114. * https://github.com/eslint/eslint/issues/7787
  115. */
  116. if (!hasNewline) {
  117. return fixer.removeRange([prevToken.range[1], parenToken.range[0]]);
  118. }
  119. return null;
  120. }
  121. });
  122. } else if (!never && !hasWhitespace) {
  123. context.report({
  124. node,
  125. loc: lastCalleeToken.loc.start,
  126. messageId: "missing",
  127. fix(fixer) {
  128. return fixer.insertTextBefore(parenToken, " ");
  129. }
  130. });
  131. } else if (!never && !allowNewlines && hasNewline) {
  132. context.report({
  133. node,
  134. loc: lastCalleeToken.loc.start,
  135. messageId: "unexpected",
  136. fix(fixer) {
  137. return fixer.replaceTextRange([prevToken.range[1], parenToken.range[0]], " ");
  138. }
  139. });
  140. }
  141. }
  142. return {
  143. CallExpression: checkSpacing,
  144. NewExpression: checkSpacing
  145. };
  146. }
  147. };