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#ifndef _PASSENGER_STR_INT_TOOLS_STRING_SCANNING_H_
#define _PASSENGER_STR_INT_TOOLS_STRING_SCANNING_H_
#include <cstring>
#include <cstdlib>
#include <string>
#include <StaticString.h>
#include <StrIntTools/StrIntUtils.h>
/**
* Utility functions for scanning strings. Given a pointer to string data,
* these functions can read or skip parts of it and advance the pointer.
* Especially useful for parsing the output of command line tools.
*
* const char *data = "hello world 1234";
*
* readNextWord(&data); // => "hello"
* printf("%s\n", data); // => " world 1234"
*
* readNextWord(&data); // => "world"
* printf("%s\n", data); // => " 1234"
*
* readNextWordAsInt(&data); // => 1234
* printf("%s\n", data); // => ""
*
* readNextWord(&data); // => ParseException,
* // because end has been reached
*/
namespace Passenger {
using namespace std;
struct ParseException {};
/**
* Scan the given data for the first word that appears on the first line.
* Leading whitespaces (but not newlines) are ignored. If a word is found
* then the word is returned and the data pointer is moved to the end of
* the word.
*
* If the first line only contains whitespaces, or if the first line is empty,
* then a ParseException is thrown.
*
* @post result.size() > 0
*/
inline StaticString
readNextWord(const char **data) {
skipLeadingWhitespaces(data);
if (**data == '\n' || **data == '\0') {
throw ParseException();
}
// Find end of word and extract the word.
const char *endOfWord = *data;
while (*endOfWord != ' ' && *endOfWord != '\n' && *endOfWord != '\0') {
endOfWord++;
}
StaticString result(*data, endOfWord - *data);
// Move data pointer to the end of this word.
*data = endOfWord;
return result;
}
inline long long
_processNextWordAsLongLong(const StaticString &word, char *nullTerminatedWord) {
memcpy(nullTerminatedWord, word.c_str(), word.size());
nullTerminatedWord[word.size()] = '\0';
if (*nullTerminatedWord == '\0') {
throw ParseException();
} else {
return atoll(nullTerminatedWord);
}
}
/**
* Scan the given data for the first word that appears on the first line.
* Leading whitespaces (but not newlines) are ignored. If a word is found
* then the word is parsed as a 'long long' number and returned, and the
* data pointer is moved to the end of the word.
*
* If the first line only contains whitespaces, or if the first line is empty,
* then a ParseException is thrown.
*/
inline long long
readNextWordAsLongLong(const char **data) {
StaticString word = readNextWord(data);
if (word.size() < 50) {
char nullTerminatedWord[50];
return _processNextWordAsLongLong(word, nullTerminatedWord);
} else {
string nullTerminatedWord(word.size() + 1, '\0');
return _processNextWordAsLongLong(word, &nullTerminatedWord[0]);
}
}
inline int
_processNextWordAsInt(const StaticString &word, char *nullTerminatedWord) {
memcpy(nullTerminatedWord, word.c_str(), word.size());
nullTerminatedWord[word.size()] = '\0';
if (*nullTerminatedWord == '\0') {
throw ParseException();
} else {
return atoi(nullTerminatedWord);
}
}
/**
* Scan the given data for the first word that appears on the first line.
* Leading whitespaces (but not newlines) are ignored. If a word is found
* then the word is parsed as an 'int' number and returned, and the
* data pointer is moved to the end of the word.
*
* If the first line only contains whitespaces, or if the first line is empty,
* then a ParseException is thrown.
*/
inline int
readNextWordAsInt(const char **data) {
StaticString word = readNextWord(data);
if (word.size() < 50) {
char nullTerminatedWord[50];
return _processNextWordAsInt(word, nullTerminatedWord);
} else {
string nullTerminatedWord(word.size() + 1, '\0');
return _processNextWordAsInt(word, &nullTerminatedWord[0]);
}
}
inline double
_processNextWordAsDouble(const StaticString &word, char *nullTerminatedWord) {
memcpy(nullTerminatedWord, word.c_str(), word.size());
nullTerminatedWord[word.size()] = '\0';
if (*nullTerminatedWord == '\0') {
throw ParseException();
} else {
return atof(nullTerminatedWord);
}
}
/**
* Scan the given data for the first word that appears on the first line.
* Leading whitespaces (but not newlines) are ignored. If a word is found
* then the word is parsed as an 'double' number and returned, and the
* data pointer is moved to the end of the word.
*
* If the first line only contains whitespaces, or if the first line is empty,
* then a ParseException is thrown.
*/
inline double
readNextWordAsDouble(const char **data) {
StaticString word = readNextWord(data);
if (word.size() < 50) {
char nullTerminatedWord[50];
return _processNextWordAsDouble(word, nullTerminatedWord);
} else {
string nullTerminatedWord(word.size() + 1, '\0');
return _processNextWordAsDouble(word, &nullTerminatedWord[0]);
}
}
/**
* Return the first line in the given data, excluding leading and trailing
* whitespaces, and excluding newline. If the first line only contains
* whitespaces or if the first line is empty, then the empty string is
* returned.
*
* If the data does not contain a newline, then a ParseException is thrown.
*/
inline string
readRestOfLine(const char *data) {
skipLeadingWhitespaces(&data);
// Rest of line is allowed to be empty.
if (*data == '\n' || *data == '\0') {
return "";
}
// Look for newline character. From there, scan back until we've
// found a non-whitespace character.
const char *endOfLine = strchr(data, '\n');
if (endOfLine == NULL) {
throw ParseException();
}
while (*(endOfLine - 1) == ' ') {
endOfLine--;
}
return string(data, endOfLine - data);
}
inline bool
skipToNextLine(const char **data) {
const char *pos = strchr(*data, '\n');
if (pos != NULL) {
pos++;
*data = pos;
return true;
} else {
return false;
}
}
/**
* Extract the first sentence from the first line in the data, where the end
* of the sentence is dictated by the `terminator` argument.
* Leading whitespaces (but not newlines) are ignored. The sentence is returned
* and the data pointer is moved to 1 character past the terminator.
*
* The terminator may not be '\n' or '\0'.
*
* A ParseException is thrown if one of the following conditions are encountered:
*
* * The first line only contains whitespaces.
* * The first line is empty.
* * The read sentence is empty.
* * The terminator character is not found.
*
* @post result.size() > 0
*/
inline StaticString
readNextSentence(const char **data, char terminator) {
skipLeadingWhitespaces(data);
if (**data == '\n' || **data == '\0' || **data == terminator) {
throw ParseException();
}
// Find end of sentence and extract the sentence.
const char *endOfSentence = *data;
do {
endOfSentence++;
} while (*endOfSentence != terminator && *endOfSentence != '\n' && *endOfSentence != '\0');
if (*endOfSentence == terminator) {
StaticString result(*data, endOfSentence - *data);
// Move data pointer 1 character past the terminator.
*data = endOfSentence + 1;
return result;
} else {
throw ParseException();
}
}
} // namespace Passenger
#endif /* _PASSENGER_STR_INT_TOOLS_TEMPLATE_H_ */
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