parser.pegjs 8.8 KB

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  1. start = method
  2. separator = [ \t\v\f\u00A0\uFEFF\n\r\u2028\u2029]+
  3. comments = (["][^"]*["])+
  4. ws = (separator / comments)*
  5. identifier = first:[a-zA-Z] others:[a-zA-Z0-9]* {return first + others.join("")}
  6. varIdentifier = first:[a-z] others:[a-zA-Z0-9]* {return first + others.join("")}
  7. keyword = first:identifier last:[:] {return first + last}
  8. className = first:[A-Z] others:[a-zA-Z0-9]* {return first + others.join("")}
  9. string = ['] val:(("''" {return "'"} / [^'])*) ['] {
  10. return smalltalk.ValueNode._new()
  11. ._value_(val.join("").replace(/\"/ig, '"'))
  12. }
  13. symbol = "#"val:(
  14. digits:[a-zA-Z0-9\:]+ {return digits.join("")}
  15. / node:string {return node._value()})*
  16. {
  17. return smalltalk.ValueNode._new()
  18. ._value_(smalltalk.symbolFor(val.join("").replace(/\"/ig, '"')))
  19. }
  20. number = n:(float / integer) {
  21. return smalltalk.ValueNode._new()
  22. ._value_(n)
  23. }
  24. float = neg:[-]?int:[0-9]+ "." dec:[0-9]+ {return parseFloat((neg + int.join("") + "." + dec.join("")), 10)}
  25. integer = neg:[-]?digits:[0-9]+ {return (parseInt(neg+digits.join(""), 10))}
  26. literalArray = "#(" ws lits:(lit:literal ws {return lit._value()})* ws ")" {
  27. return smalltalk.ValueNode._new()
  28. ._value_(lits)
  29. }
  30. dynamicArray = "{" ws expressions:expressions? ws "."? "}" {
  31. return smalltalk.DynamicArrayNode._new()
  32. ._nodes_(expressions)
  33. }
  34. dynamicDictionary = "#{" ws expressions: expressions? ws "}" {
  35. return smalltalk.DynamicDictionaryNode._new()
  36. ._nodes_(expressions)
  37. }
  38. pseudoVariable = val:(
  39. 'true' {return true}
  40. / 'false' {return false}
  41. / 'nil' {return nil}) {
  42. return smalltalk.ValueNode._new()
  43. ._value_(val)
  44. }
  45. literal = pseudoVariable / number / literalArray / dynamicDictionary / dynamicArray / string / symbol / block
  46. variable = identifier:varIdentifier {
  47. return smalltalk.VariableNode._new()
  48. ._value_(identifier)
  49. }
  50. classReference = className:className {
  51. return smalltalk.ClassReferenceNode._new()
  52. ._value_(className)
  53. }
  54. reference = variable / classReference
  55. keywordPair = key:keyword ws arg:binarySend ws {return {key:key, arg: arg}}
  56. binarySelector = bin:[\\+*/=><,@%~|&-]+ {return bin.join("").replace(/\\/g, '\\\\')}
  57. unarySelector = identifier
  58. keywordPattern = pairs:(ws key:keyword ws arg:identifier {return {key:key, arg: arg}})+ {
  59. var keywords = [];
  60. var params = [];
  61. for(var i=0;i<pairs.length;i++){
  62. keywords.push(pairs[i].key);
  63. }
  64. for(var i=0;i<pairs.length;i++){
  65. params.push(pairs[i].arg);
  66. }
  67. return [keywords.join(""), params]
  68. }
  69. binaryPattern = ws selector:binarySelector ws arg:identifier {return [selector, [arg]]}
  70. unaryPattern = ws selector:unarySelector {return [selector, []]}
  71. expression = assignment / cascade / keywordSend / binarySend / jsStatement
  72. expressionList = ws "." ws expression:expression {return expression}
  73. expressions = first:expression others:expressionList* {
  74. var result = [first];
  75. for(var i=0;i<others.length;i++) {
  76. result.push(others[i]);
  77. }
  78. return result;
  79. }
  80. assignment = variable:variable ws ':=' ws expression:expression {
  81. return smalltalk.AssignmentNode._new()
  82. ._left_(variable)
  83. ._right_(expression)
  84. }
  85. ret = '^' ws expression:expression ws '.'? {
  86. return smalltalk.ReturnNode._new()
  87. ._nodes_([expression])
  88. }
  89. temps = "|" vars:(ws variable:identifier ws {return variable})* "|" {return vars}
  90. blockParamList = params:((ws ":" ws param:identifier {return param})+) ws "|" {return params}
  91. subexpression = '(' ws expression:expression ws ')' {return expression}
  92. statements = ret:ret [.]* {return [ret]}
  93. / exps:expressions ws [.]+ ws ret:ret [.]* {
  94. var expressions = exps;
  95. expressions.push(ret);
  96. return expressions
  97. }
  98. / expressions:expressions? [.]* {
  99. return expressions || []
  100. }
  101. sequence = temps:temps? ws statements:statements? ws {
  102. return smalltalk.SequenceNode._new()
  103. ._temps_(temps || [])
  104. ._nodes_(statements || [])
  105. }
  106. block = '[' ws params:blockParamList? ws sequence:sequence? ws ']' {
  107. return smalltalk.BlockNode._new()
  108. ._parameters_(params || [])
  109. ._nodes_([sequence._asBlockSequenceNode()])
  110. }
  111. operand = literal / reference / subexpression
  112. unaryMessage = ws selector:unarySelector ![:] {
  113. return smalltalk.SendNode._new()
  114. ._selector_(selector)
  115. }
  116. unaryTail = message:unaryMessage ws tail:unaryTail? ws {
  117. if(tail) {
  118. return tail._valueForReceiver_(message);
  119. }
  120. else {
  121. return message;
  122. }
  123. }
  124. unarySend = receiver:operand ws tail:unaryTail? {
  125. if(tail) {
  126. return tail._valueForReceiver_(receiver);
  127. }
  128. else {
  129. return receiver;
  130. }
  131. }
  132. binaryMessage = ws selector:binarySelector ws arg:(unarySend / operand) {
  133. return smalltalk.SendNode._new()
  134. ._selector_(selector)
  135. ._arguments_([arg])
  136. }
  137. binaryTail = message:binaryMessage tail:binaryTail? {
  138. if(tail) {
  139. return tail._valueForReceiver_(message);
  140. }
  141. else {
  142. return message;
  143. }
  144. }
  145. binarySend = receiver:unarySend tail:binaryTail? {
  146. if(tail) {
  147. return tail._valueForReceiver_(receiver);
  148. }
  149. else {
  150. return receiver;
  151. }
  152. }
  153. keywordMessage = ws pairs:(pair:keywordPair ws {return pair})+ {
  154. var selector = [];
  155. var args = [];
  156. for(var i=0;i<pairs.length;i++) {
  157. selector.push(pairs[i].key);
  158. args.push(pairs[i].arg);
  159. }
  160. return smalltalk.SendNode._new()
  161. ._selector_(selector.join(""))
  162. ._arguments_(args)
  163. }
  164. keywordSend = receiver:binarySend tail:keywordMessage {
  165. return tail._valueForReceiver_(receiver);
  166. }
  167. message = binaryMessage / unaryMessage / keywordMessage
  168. cascade = ws send:(keywordSend / binarySend) messages:(ws ";" ws mess:message ws {return mess})+ {
  169. var cascade = [];
  170. cascade.push(send);
  171. for(var i=0;i<messages.length;i++) {
  172. cascade.push(messages[i]);
  173. }
  174. return smalltalk.CascadeNode._new()
  175. ._receiver_(send._receiver())
  176. ._nodes_(cascade)
  177. }
  178. jsStatement = "<" val:((">>" {return ">"} / [^>])*) ">" {
  179. return smalltalk.JSStatementNode._new()
  180. ._source_(val.join(""))
  181. }
  182. method = ws pattern:(keywordPattern / binaryPattern / unaryPattern) ws sequence:sequence? ws {
  183. return smalltalk.MethodNode._new()
  184. ._selector_(pattern[0])
  185. ._arguments_(pattern[1])
  186. ._nodes_([sequence])
  187. }