JsonReader
Gson.fromJson(String jsonString, Class class){
層層調用
JsonReader.peek()->doPeek();
}
int doPeek() throws IOException {
int peekStack = stack[stackSize - 1];
if (peekStack == JsonScope.EMPTY_ARRAY) {
stack[stackSize - 1] = JsonScope.NONEMPTY_ARRAY;
} else if (peekStack == JsonScope.NONEMPTY_ARRAY) {
// Look for a comma before the next element.
int c = nextNonWhitespace(true);
switch (c) {
case ']':
return peeked = PEEKED_END_ARRAY;
case ';':
checkLenient(); // fall-through
case ',':
break;
default:
throw syntaxError("Unterminated array");
}
} else if (peekStack == JsonScope.EMPTY_OBJECT || peekStack == JsonScope.NONEMPTY_OBJECT) {
stack[stackSize - 1] = JsonScope.DANGLING_NAME;
// Look for a comma before the next element.
if (peekStack == JsonScope.NONEMPTY_OBJECT) {
int c = nextNonWhitespace(true);
switch (c) {
case '}':
return peeked = PEEKED_END_OBJECT;
case ';':
checkLenient(); // fall-through
case ',':
break;
default:
throw syntaxError("Unterminated object");
}
}
int c = nextNonWhitespace(true);
switch (c) {
case '"':
return peeked = PEEKED_DOUBLE_QUOTED_NAME;
case '\'':
checkLenient();
return peeked = PEEKED_SINGLE_QUOTED_NAME;
case '}':
if (peekStack != JsonScope.NONEMPTY_OBJECT) {
return peeked = PEEKED_END_OBJECT;
} else {
throw syntaxError("Expected name");
}
default:
checkLenient();
pos--; // Don't consume the first character in an unquoted string.
if (isLiteral((char) c)) {
return peeked = PEEKED_UNQUOTED_NAME;
} else {
throw syntaxError("Expected name");
}
}
} else if (peekStack == JsonScope.DANGLING_NAME) {
stack[stackSize - 1] = JsonScope.NONEMPTY_OBJECT;
// Look for a colon before the value.
int c = nextNonWhitespace(true);
switch (c) {
case ':':
break;
case '=':
checkLenient();
if ((pos < limit || fillBuffer(1)) && buffer[pos] == '>') {
pos++;
}
break;
default:
throw syntaxError("Expected ':'");
}
} else if (peekStack == JsonScope.EMPTY_DOCUMENT) {
if (lenient) {
consumeNonExecutePrefix();
}
stack[stackSize - 1] = JsonScope.NONEMPTY_DOCUMENT;
} else if (peekStack == JsonScope.NONEMPTY_DOCUMENT) {
int c = nextNonWhitespace(false);
if (c == -1) {
return peeked = PEEKED_EOF;
} else {
checkLenient();
pos--;
}
} else if (peekStack == JsonScope.CLOSED) {
throw new IllegalStateException("JsonReader is closed");
}
int c = nextNonWhitespace(true);
switch (c) {
case ']':
if (peekStack == JsonScope.EMPTY_ARRAY) {
return peeked = PEEKED_END_ARRAY;
}
// fall-through to handle ",]"
case ';':
case ',':
// In lenient mode, a 0-length literal in an array means 'null'.
if (peekStack == JsonScope.EMPTY_ARRAY || peekStack == JsonScope.NONEMPTY_ARRAY) {
checkLenient();
pos--;
return peeked = PEEKED_NULL;
} else {
throw syntaxError("Unexpected value");
}
case '\'':
checkLenient();
return peeked = PEEKED_SINGLE_QUOTED;
case '"':
return peeked = PEEKED_DOUBLE_QUOTED;
case '[':
return peeked = PEEKED_BEGIN_ARRAY;
case '{':
return peeked = PEEKED_BEGIN_OBJECT;
default:
pos--; // Don't consume the first character in a literal value.
}
int result = peekKeyword();
if (result != PEEKED_NONE) {
return result;
}
result = peekNumber();
if (result != PEEKED_NONE) {
return result;
}
if (!isLiteral(buffer[pos])) {
throw syntaxError("Expected value");
}
checkLenient();
return peeked = PEEKED_UNQUOTED;
}