syntax.py

syntax = r'''
<ts>              := [ \t]*

# Variable delcarations
local_var         := [a-z], [a-z0-9_]*
global_var        := [A-Z], [a-z0-9_]+

# The chain of indexes and properties for objects
tail              := (index/property/func_call)+
index             := "[", expression, "]"
property          := ".", local_var
func_call         := ts, ("(", arg_list?, ")")/(" "+, arg_list, " "+), ts
arg_list          := ts, expression, ts, (",", arg_list)?

# Structure of the basic code
body              := [ \n\t]*, statement, (terminal, statement)*, terminal?, [ \n\t]*
<terminal>        := ";"/"\n"
statement         := assignment/expression
assignment        := identifier, ts, '=', expression


# Basic expressions and grouping (identifiers are like special expressions for variables)
identifier        := local_var/global_var, tail?
expression        := ts, identifier/(expression_group/literal/block, tail?), ts, (operator, ts, expression)?
expression_group  := "(", ts, expression, ts, ")"


# Blocks and their assorted stuff
block             := "{", ("|", param_list, "|")?, body, "}"
param_list        := ts, local_var, ts, (",", param_list)?

operator          := math_op
<math_op>         := "+"/"-"/"*"/"/"


literal           := string/number
number            := [1-9], [0-9]*, decimal?
string            := ("\"", -"\""+, "\"")/("'", -"'"+, "'")
<decimal>         := ".", [0-9]+
'''