/**
* Process a scalar value.
* Handles string literals including defined constants
* @return mixed
* @throws Exception when there's an unexpected value
*/
protected function process_value()
{
# String literals
if ($this->tokens->matches(T_STRING)) {
$t_token = $this->tokens->pop();
$t_value = $t_token[1];
# PHP Standard string literals
switch (strtolower($t_value)) {
case 'null':
return null;
case 'true':
return true;
case 'false':
return false;
}
# Defined constants
$t_value = $this->constant_replace($t_value);
if ($t_value !== $t_token[1]) {
return $t_value;
}
throw new Exception("Unknown string literal '{$t_value}'");
}
# Strings
if ($this->tokens->matches(T_CONSTANT_ENCAPSED_STRING)) {
$t_value = $this->tokens->pop();
return (string) stripslashes(substr($t_value[1], 1, -1));
}
# Numbers
$t_negate = 1;
if ($this->tokens->matches('-')) {
$this->tokens->pop();
$t_negate = -1;
}
if ($this->tokens->matches('+')) {
$this->tokens->pop();
}
# Integers
if ($this->tokens->matches(T_LNUMBER)) {
$t_value = $this->tokens->pop();
return $t_negate * (int) $t_value[1];
}
# Floating point
if ($this->tokens->matches(T_DNUMBER)) {
$t_value = $this->tokens->pop();
return $t_negate * (double) $t_value[1];
}
# Anything else
throw new Exception("Unexpected value" . $this->tokens->value());
}
