private function consumeChar($c)
{
// valid whitespace characters in JSON (from RFC4627 for JSON) include:
// space, horizontal tab, line feed or new line, and carriage return.
// thanks: http://stackoverflow.com/questions/16042274/definition-of-whitespace-in-json
if (($c === " " || $c === "\t" || $c === "\n" || $c === "\r") && !($this->state === self::STATE_IN_STRING || $this->state === self::STATE_UNICODE || $this->state === self::STATE_START_ESCAPE || $this->state === self::STATE_IN_NUMBER || $this->state === self::STATE_START_DOCUMENT)) {
return;
}
switch ($this->state) {
case self::STATE_START_DOCUMENT:
$this->listener->onDocumentStart();
if ($c === '[') {
$this->startArray();
} elseif ($c === '{') {
$this->startObject();
} else {
throw new ParsingError($this->lineNumber, $this->charNumber, "Document must start with object or array.");
}
break;
case self::STATE_IN_ARRAY:
if ($c === ']') {
$this->endArray();
} else {
$this->startValue($c);
}
break;
case self::STATE_IN_OBJECT:
if ($c === '}') {
$this->endObject();
} elseif ($c === '"') {
$this->startKey();
} else {
throw new ParsingError($this->lineNumber, $this->charNumber, "Start of string expected for object key. Instead got: " . $c);
}
break;
case self::STATE_END_KEY:
if ($c !== ':') {
throw new ParsingError($this->lineNumber, $this->charNumber, "Expected ':' after key.");
}
$this->state = self::STATE_AFTER_KEY;
break;
case self::STATE_AFTER_KEY:
$this->startValue($c);
break;
case self::STATE_IN_STRING:
if ($c === '"') {
$this->endString();
} elseif ($c === '\\') {
$this->state = self::STATE_START_ESCAPE;
} elseif ($c < " " || $c === "") {
throw new ParsingError($this->lineNumber, $this->charNumber, "Unescaped control character encountered: " . $c);
} else {
$this->buffer .= $c;
}
break;
case self::STATE_START_ESCAPE:
$this->processEscapeCharacter($c);
break;
case self::STATE_UNICODE:
$this->processUnicodeCharacter($c);
break;
case self::STATE_AFTER_VALUE:
$within = end($this->stack);
if ($within === self::STACK_OBJECT) {
if ($c === '}') {
$this->endObject();
} elseif ($c === ',') {
$this->state = self::STATE_IN_OBJECT;
} else {
throw new ParsingError($this->lineNumber, $this->charNumber, "Expected ',' or '}' while parsing object. Got: " . $c);
}
} elseif ($within === self::STACK_ARRAY) {
if ($c === ']') {
$this->endArray();
} elseif ($c === ',') {
$this->state = self::STATE_IN_ARRAY;
} else {
throw new ParsingError($this->lineNumber, $this->charNumber, "Expected ',' or ']' while parsing array. Got: " . $c);
}
} else {
throw new ParsingError($this->lineNumber, $this->charNumber, "Finished a literal, but unclear what state to move to. Last state: " . $within);
}
break;
case self::STATE_IN_NUMBER:
if (preg_match('/\\d/', $c)) {
$this->buffer .= $c;
} elseif ($c === '.') {
if (strpos($this->buffer, '.') !== false) {
throw new ParsingError($this->lineNumber, $this->charNumber, "Cannot have multiple decimal points in a number.");
} elseif (stripos($this->buffer, 'e') !== false) {
throw new ParsingError($this->lineNumber, $this->charNumber, "Cannot have a decimal point in an exponent.");
}
$this->buffer .= $c;
} elseif ($c === 'e' || $c === 'E') {
if (stripos($this->buffer, 'e') !== false) {
throw new ParsingError($this->lineNumber, $this->charNumber, "Cannot have multiple exponents in a number.");
}
$this->buffer .= $c;
} elseif ($c === '+' || $c === '-') {
$last = mb_substr($this->buffer, -1);
if (!($last === 'e' || $last === 'E')) {
throw new ParsingError($this->lineNumber, $this->charNumber, "Can only have '+' or '-' after the 'e' or 'E' in a number.");
}
$this->buffer .= $c;
} else {
$this->endNumber();
// we have consumed one beyond the end of the number
$this->consumeChar($c);
}
break;
case self::STATE_IN_TRUE:
$this->buffer .= $c;
if (mb_strlen($this->buffer) === 4) {
$this->endTrue();
}
break;
case self::STATE_IN_FALSE:
$this->buffer .= $c;
if (mb_strlen($this->buffer) === 5) {
$this->endFalse();
}
break;
case self::STATE_IN_NULL:
$this->buffer .= $c;
if (mb_strlen($this->buffer) === 4) {
$this->endNull();
}
break;
case self::STATE_DONE:
throw new ParsingError($this->lineNumber, $this->charNumber, "Expected end of document.");
default:
throw new ParsingError($this->lineNumber, $this->charNumber, "Internal error. Reached an unknown state: " . $this->state);
}
}
