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https://issues.apache.org/jira/browse/ARROW-2224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16433951#comment-16433951
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ASF GitHub Bot commented on ARROW-2224:
---------------------------------------
pitrou commented on a change in pull request #1880: ARROW-2224: [C++] Remove
boost-regex dependency
URL: https://github.com/apache/arrow/pull/1880#discussion_r180765500
##########
File path: cpp/src/arrow/util/decimal.cc
##########
@@ -253,117 +251,131 @@ static void StringToInteger(const std::string& str,
Decimal128* out) {
}
}
-static const boost::regex DECIMAL_REGEX(
- // sign of the number
- "(?<SIGN>[-+]?)"
-
- // digits around the decimal point
-
"(((?<LEFT_DIGITS>\\d+)\\.(?<FIRST_RIGHT_DIGITS>\\d*)|\\.(?<SECOND_RIGHT_DIGITS>\\d+)"
- ")"
+namespace {
- // optional exponent
- "([eE](?<FIRST_EXP_VALUE>[-+]?\\d+))?"
+struct DecimalComponents {
+ std::string sign;
+ std::string whole_digits;
+ std::string fractional_digits;
+ std::string exponent_sign;
+ std::string exponent_digits;
+};
- // otherwise
- "|"
+inline bool IsSign(char c) { return (c == '-' || c == '+'); }
- // we're just an integer
- "(?<INTEGER>\\d+)"
+inline bool IsDot(char c) { return c == '.'; }
- // or an integer with an exponent
- "(?:[eE](?<SECOND_EXP_VALUE>[-+]?\\d+))?)");
+inline bool IsDigit(char c) { return (c >= '0' && c <= '9'); }
-static inline bool is_zero_character(char c) { return c == '0'; }
+inline bool StartsExponent(char c) { return (c == 'e' || c == 'E'); }
-Status Decimal128::FromString(const std::string& s, Decimal128* out, int32_t*
precision,
- int32_t* scale) {
- if (s.empty()) {
- return Status::Invalid("Empty string cannot be converted to decimal");
+inline size_t ParseDigitsRun(const char* s, size_t start, size_t size,
std::string* out) {
+ size_t pos;
+ for (pos = start; pos < size; ++pos) {
+ if (!IsDigit(s[pos])) {
+ break;
+ }
}
+ *out = std::string(s + start, pos - start);
+ return pos;
+}
- // case of all zeros
- if (std::all_of(s.cbegin(), s.cend(), is_zero_character)) {
- if (precision != nullptr) {
- *precision = 0;
- }
+bool ParseDecimalComponents(const char* s, size_t size, DecimalComponents*
out) {
Review comment:
I mean if the parse function is taking a `string::const_iterator`, it maybe
won't accept a different kind of iterator. Or we need to make it a template
function, piling more layers of abstraction without any concrete advantage.
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> [C++] Replace boost regex usage with libre2
> -------------------------------------------
>
> Key: ARROW-2224
> URL: https://issues.apache.org/jira/browse/ARROW-2224
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Phillip Cloud
> Assignee: Phillip Cloud
> Priority: Major
> Labels: pull-request-available
>
> We're using {{boost::regex}} to parse decimal strings for {{decimal128}}
> types. We should use {{libre2}} instead.
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