A templating language that looks like Lisp and compiles to HTML
Vous ne pouvez pas sélectionner plus de 25 sujets Les noms de sujets doivent commencer par une lettre ou un nombre, peuvent contenir des tirets ('-') et peuvent comporter jusqu'à 35 caractères.

parser.js 2.3KB

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  1. const Error = require('./Error')
  2. const AST = require('./ast')
  3. const tokenTypes = require('./tokenTypes')
  4. module.exports = class Parser {
  5. constructor(tokenStream) {
  6. this.tokenStream = tokenStream
  7. }
  8. parse() {
  9. let tree = []
  10. while (this.tokenStream.peek().type !== tokenTypes.EOF) {
  11. tree.push(this.expr())
  12. if (this.tokenStream.error) {
  13. return {
  14. error: this.tokenStream.error,
  15. }
  16. }
  17. }
  18. return tree
  19. }
  20. expr() {
  21. let token = this.tokenStream.peek()
  22. switch (token.type) {
  23. case tokenTypes.ATTRIBUTE:
  24. return this.attribute()
  25. case tokenTypes.BOOLEAN:
  26. return this.bool()
  27. case tokenTypes.IDENTIFIER:
  28. return this.identifier()
  29. case tokenTypes.NUMBER:
  30. return this.number()
  31. case tokenTypes.QUOTE:
  32. return this.string()
  33. case tokenTypes.SYMBOL:
  34. return this.symbol()
  35. case tokenTypes.OPAREN:
  36. return this.form()
  37. default:
  38. this.tokenStream.error = `Unexpected ${token.type} on line ${token.line}`
  39. break;
  40. }
  41. }
  42. form() {
  43. this.tokenStream.eat(tokenTypes.OPAREN)
  44. let node = new AST.Application()
  45. node.functionName = this.identifier()
  46. node.args = []
  47. while (this.tokenStream.peek().type !== tokenTypes.CPAREN) {
  48. node.args.push(this.expr())
  49. }
  50. this.tokenStream.eat(tokenTypes.CPAREN)
  51. return node
  52. }
  53. attribute() {
  54. return new AST.Attribute({
  55. name: this.tokenStream.eat(tokenTypes.ATTRIBUTE).value,
  56. value: this.expr()
  57. })
  58. }
  59. bool() {
  60. return new AST.Boolean({
  61. value: this.tokenStream.eat(tokenTypes.BOOLEAN).value
  62. })
  63. }
  64. identifier() {
  65. return new AST.Identifier({
  66. name: this.tokenStream.eat(tokenTypes.IDENTIFIER).value
  67. })
  68. }
  69. number() {
  70. return new AST.Number({
  71. value: this.tokenStream.eat(tokenTypes.NUMBER).value
  72. })
  73. }
  74. string() {
  75. this.tokenStream.eat(tokenTypes.QUOTE)
  76. let value = ''
  77. if (this.tokenStream.peek().type === tokenTypes.LITERAL) {
  78. value = this.tokenStream.eat(tokenTypes.LITERAL).value
  79. }
  80. let node = new AST.String({
  81. value: value
  82. })
  83. this.tokenStream.eat(tokenTypes.QUOTE)
  84. return node
  85. }
  86. symbol() {
  87. return new AST.Symbol({
  88. value: this.tokenStream.eat(tokenTypes.SYMBOL).value
  89. })
  90. }
  91. }