IGG (Infix EGG)

Grammar

expressions: (declaration | expression) (';' declaration | expression)*

declaration: 'var' WORD
           | 'var' WORD '=' expression

expression: or

or: and ('||' and)*

and: comparison ('&&' comparison)*

comparison: assign (COMP_OP assign)?

assign: sum ('=' assign)?

sum: product (ADD_OP product)*

product: factor (MUL_OP factor)*

factor: '(' expression ')'
      | STRING
      | NUMBER
      | apply

apply: WORD
     | 'if' '(' expression ')' scopedExpressions ('else' scopedExpressions)?
     | ('while' | 'fun' | 'method') '(' expression ')' scopedExpressions
     | WORD ('.' WORD | '(' expressionList ')')+
     
expressionList: (expression (COMMA expression)*)?

scopedExpressions: expression
                 | '{' expressions '}'


WHITES = /^(\s|[#].*|\/\*(.|\n)*?\*\/)*/;
STRING = /^"((?:[^"\\]|\\.)*)"/;
NUMBER = /^([-+]?\d*\.?\d+([eE][-+]?\d+)?)/;
WORD   = /[^\\s(),;\\[\\]{}"\\:\\.]+|\\.\\.\\.[^\\s(),\\[\\]{}"\\:\\.]+/;
COMP_OP = /[<>]=?|[!=]=/;
ADD_OP = /[+-]/;
MUL_OP = /[*\/]/;
COMMA = /[,\:]/;