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Code Issues Releases Wiki Activity

Refactor end of input handling in JSONParser

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This commit is contained in:
m-holger 2023-01-26 09:55:34 +00:00
parent 8fd6e1c5b2
commit 83f972ceda
5 changed files with 16 additions and 55 deletions
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62
libqpdf/JSON.cc
View File

@ -1012,7 +1012,7 @@ JSONParser::getToken()
case ls_number:
// We only get here after we have seen an exponent.
if ((*p >= '0') && (*p <= '9')) {
++number_after_e;
++number_after_e;
} else if (QUtil::is_space(*p)) {
action = ignore;
ready = true;
@ -1093,38 +1093,27 @@ JSONParser::getToken()
}
}
if (done) {
if ((!token.empty()) && (!ready)) {
if (!token.empty() && !ready) {
switch (lex_state) {
case ls_top:
// Can't happen
throw std::logic_error("tok_start set in ls_top while parsing");
break;
case ls_number:
case ls_number_minus:
case ls_number_leading_zero:
case ls_number_before_point:
case ls_number_point:
case ls_number_after_point:
case ls_number_e:
case ls_number_e_sign:
lex_state = ls_number;
break;
case ls_number:
case ls_alpha:
// okay
// terminal state
break;
case ls_u4:
QTC::TC("libtests", "JSON parse premature end of u");
throw std::runtime_error(
"JSON: offset " + std::to_string(offset - u_count - 1) +
": \\u must be followed by four characters");
case ls_string:
case ls_backslash:
QTC::TC("libtests", "JSON parse unterminated string");
throw std::runtime_error(
"JSON: offset " + std::to_string(offset) +
": unterminated string");
break;
default:
QTC::TC("libtests", "JSON parse ls premature end of input");
throw std::runtime_error("JSON: premature end of input");
}
}
}
@ -1181,32 +1170,6 @@ JSONParser::handleToken()
break;
case ls_number:
case ls_number_minus:
case ls_number_leading_zero:
case ls_number_before_point:
case ls_number_point:
case ls_number_after_point:
case ls_number_e:
case ls_number_e_sign:
if (number_saw_point && (number_after_point == 0)) {
// QTC::TC("libtests", "JSON parse decimal with no digits");
throw std::runtime_error(
"JSON: offset " + std::to_string(offset) +
": decimal point with no digits");
}
if ((number_before_point > 1) &&
((first_char == '0') ||
((first_char == '-') && (token.at(1) == '0')))) {
throw std::runtime_error(
"JSON: offset " + std::to_string(offset) +
": number with leading zero");
}
if ((number_before_point == 0) && (number_after_point == 0)) {
// QTC::TC("libtests", "JSON parse number no digits");
throw std::runtime_error(
"JSON: offset " + std::to_string(offset) +
": number with no digits");
}
item = std::make_shared<JSON>(JSON::makeNumber(token));
break;
@ -1229,10 +1192,9 @@ JSONParser::handleToken()
item = std::make_shared<JSON>(JSON::makeString(s_value));
break;
case ls_backslash:
case ls_u4:
default:
throw std::logic_error(
"tok_end is set while state = ls_backslash or ls_u4");
"JSONParser::handleToken : non-terminal lexer state encountered");
break;
}

3
libtests/libtests.testcov
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@ -79,9 +79,8 @@ JSON parse number minus no digits 0
JSON parse incomplete number 0
JSON parse keyword bad character 0
JSON parse backslash bad character 0
JSON parse unterminated string 0
JSON parse leading zero 0
JSON parse premature end of u 0
JSON parse ls premature end of input 0
JSON parse bad hex after u 0
JSONHandler unhandled value 0
JSONHandler unexpected key 0

2
libtests/qtest/json_parse/bad-27.out
View File

@ -1 +1 @@
exception: bad-27.json: JSON: offset 6: unterminated string
exception: bad-27.json: JSON: premature end of input

2
libtests/qtest/json_parse/bad-28.out
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@ -1 +1 @@
exception: bad-28.json: JSON: offset 16: unterminated string
exception: bad-28.json: JSON: premature end of input

2
libtests/qtest/json_parse/bad-34.out
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@ -1 +1 @@
exception: bad-34.json: JSON: offset 3: \u must be followed by four characters
exception: bad-34.json: JSON: premature end of input