onelang/langs/javascript.yaml

OneLang transpiler framework core

name: javascript
extension: js
casing:
  class: pascal_case
  method: camel_case
  field: camel_case
  property: camel_case
  variable: camel_case
  enum: pascal_case
  enumMember: upper_case
primitiveTypes:
  void: void
  any: object
templates:
  testGenerator: |-
    try {
      new {{class}}().{{method}}();
    } catch(e) {
      console.log(`Exception: ${e.message}`);
    }

  main: |-
    {{for inc in includes|sep=\n}}
      const {{inc.name}} = require('{{inc.source}}');
    {{/for}}

    {{for enum in enums|sep=\n\n}}
      const {{enum.name}} = Object.freeze({
        {{for item in enum.values}}
          {{item.name}}: "{{item.origName}}",
        {{/for}}
      });
    {{/for}}

    {{for class in classes|sep=\n\n}}
      class {{class.name}}
      {{if class.baseClass|inline}}
         extends {{class.baseClass}}
      {{/if}}
       {
        {{if class.needsConstructor}}
          constructor({{if class.constructor}}{{genArgs(class.constructor)}}{{/if}}) {
              {{for field in class.fields|sep=\n}}
                {{if field.static == false && field.initializer}}
                  this.{{field.name}} = {{gen(field.initializer)}};
                {{/if}}
              {{/for}}
              {{if class.constructor}}
                {{genBody(class.constructor.body)}}
              {{/if}}
          }
        {{/if}}

        {{for method in class.methods|sep="\n  \n"}}
          {{if method.static}}static {{/if}}{{method.name}}({{genArgs(method)}}) {
            {{genBody(method.body)}}
          }
        {{/for}}
      }

      {{for field in class.fields|sep=\n}}
        {{if field.static && field.initializer}}
          {{class.name}}.{{field.name}} = {{gen(field.initializer)}};
        {{/if}}
      {{/for}}

      {{endClass(class)}}
    {{/for}}

    {{genBody(mainBlock)}}

  genBody:
    args:
      - name: body
    template: |-
      {{for statement in body.statements|sep=\n}}
        {{statement.leadingTrivia}}{{gen(statement)}}
      {{/for}}

  genArgs:
    args:
      - name: method
    template: |-
      {{for param in method.parameters|sep=", "}}
        {{param.name}}
      {{/for}}
  genParams:
    args:
      - name: params
    template: |-
      {{for param in params|sep=", " inline}}
        {{gen(param)}}
      {{/for}}
  genVar:
    args:
      - name: itemVar
    template: "{{if itemVar.isMutable}}let{{else}}const{{/if}} {{itemVar.outName}} = {{gen(itemVar.initializer)}}"
expressions:
  call: |-
    {{gen(expr.method)}}(
      {{for arg in expr.arguments|sep=", " inline}}
        {{gen(arg)}}
      {{/for}}
    )
  propertyAccess: "{{gen(expr.object)}}.{{gen(expr.propertyName)}}"
  identifier: "{{expr.text}}"
  stringLiteral: '"{{expr.escapedText}}"'
  characterLiteral: '"{{expr.escapedText}}"'
  nullLiteral: "null"
  return: "return{{if expr.expression}} {{gen(expr.expression)}}{{/if}};"
  binary: "{{gen(expr.left)}} {{expr.operator}} {{gen(expr.right)}}"
  postfix: "{{gen(expr.operand)}}{{expr.operator}}"
  prefix: "{{expr.operator}}{{gen(expr.operand)}}"
  throw: "throw {{gen(expr.expression)}};"
  parenthesized: "({{gen(expr.expression)}})"
  numericLiteral: "{{expr.value}}"
  variableDeclaration: "{{genVar(expr)}};"
  new: "new {{gen(expr.cls)}}({{genParams(expr.arguments)}})"
  classReference: "{{clsName(expr.classRef)}}"
  enumReference: "{{expr.enumRef.outName}}"
  enumMemberReference: "{{expr.enumRef.outName}}.{{expr.enumMemberRef.outName}}"
  expressionStatement: "{{gen(expr.expression)}};"
  instanceMethod: "{{gen(expr.thisExpr)}}.{{expr.methodRef.outName}}"
  staticMethod: "{{clsName(expr.methodRef.classRef)}}.{{expr.methodRef.outName}}"
  localVar: "{{expr.varRef.outName}}"
  methodArgument: "{{expr.varRef.outName}}"
  instanceField: "{{gen(expr.thisExpr)}}.{{expr.varRef.outName}}"
  staticField: "{{gen(expr.thisExpr)}}.{{expr.varRef.outName}}"
  falseLiteral: "false"
  trueLiteral: "true"
  elementAccess: "{{gen(expr.object)}}[{{gen(expr.elementExpr)}}]"
  thisReference: this
  conditional: "{{gen(expr.condition)}} ? {{gen(expr.whenTrue)}} : {{gen(expr.whenFalse)}}"
  break: break
  templateString: |-
    `
    {{for part in expr.parts|inline}}
      {{if part.literal|inline}}
        {{part.text}}
      {{else}}
        ${{{gen(part.expr)}}}
      {{/if}}
    {{/for}}
    `
  foreach: |-
    for (const {{expr.itemVariable.outName}} of {{gen(expr.items)}}) {
        {{genBody(expr.body)}}
    }
  for: |-
    for ({{genVar(expr.itemVariable)}}; {{gen(expr.condition)}}; {{gen(expr.incrementor)}}) {
        {{genBody(expr.body)}}
    }
  while: |-
    while ({{gen(expr.condition)}}) {
        {{genBody(expr.body)}}
    }
  if: |-
    if ({{gen(expr.condition)}}) {
        {{genBody(expr.then)}}
    }
    {{if expr.else|inline}}
      {{" "}}
      {{if isIfBlock(expr.else)|inline}}
        else {{genBody(expr.else)}}
      {{else}}
        else {
            {{genBody(expr.else)}}
        }
      {{/if}}
    {{/if}}