Important symbols, treated as tokens here and in a variety of ways in the
standard Pascal grammar.

BECOMES = ':='
CLOSE_BRACKET = ']'
CLOSE_PAREN = ')'
COLON = ':'
COMMMA = ','
DIVIDE = '/'
DOT = '.'
DOTDOT = '..'
EQUALS = '='
ID = [a-zA-Z][a-zA-Z0-9]*
GREATER_EQUAL = '>='
GREATER_THAN = '>'
LESS_EQUAL = '<=
LESS_THAN = '<'
MINUS = '-'
NOT_EQUALS = '<>'
OPEN_BRACKET = '['
OPEN_PAREN = '('
PLUS = '+'
POINTER = '^'
SEMICOLON = ';'
STRING = \'([^']|(\'\'))+\'
UINT = [0-9]+
UREAL = ([0-9]+\.[0-9]+(E[+-]?[0-9]+)?) | ([0-9]+E[+-]?[0-9]+)