line_stream.h

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#ifndef GEOGRAM_BASIC_LINE_STREAM
#define GEOGRAM_BASIC_LINE_STREAM
 
#include <geogram/basic/common.h>
#include <geogram/basic/assert.h>
#include <geogram/basic/numeric.h>
#include <geogram/basic/string.h>
#include <cstring>
#include <stdio.h>
 
namespace GEO {
 
    class GEOGRAM_API LineInput {
    public:
    LineInput(const std::string& filename);
 
    ~LineInput();
 
    bool OK() const {
        return ok_;
    }
 
    bool eof() const {
        return feof(F_) ? true : false;
    }
 
    bool get_line();
 
    index_t nb_fields() const {
        return index_t(field_.size());
    }
 
    size_t line_number() const {
        return line_num_;
    }
 
    char* field(index_t i) {
        geo_assert(i < nb_fields());
        return field_[i];
    }
 
    const char* field(index_t i) const {
        geo_assert(i < nb_fields());
        return field_[i];
    }
 
    signed_index_t field_as_int(index_t i) const {
        signed_index_t result = 0;
        if(!String::from_string(field(i), result)) {
            conversion_error(i, "integer");
        }
        return result;
    }
 
    index_t field_as_uint(index_t i) const {
        index_t result = 0;
        if(!String::from_string(field(i), result)) {
            conversion_error(i, "unsigned integer");
        }
        return result;
    }
 
    double field_as_double(index_t i) const {
        double result = 0;
        if(!String::from_string(field(i), result)) {
            conversion_error(i, "floating point");
        }
        return result;
    }
 
    bool field_matches(index_t i, const char* s) const {
        return strcmp(field(i), s) == 0;
    }
 
    void get_fields(const char* separators = " \t\r\n");
 
    const char* current_line() const {
        return line_;
    }
 
    private:
    GEO_NORETURN_DECL void conversion_error(
        index_t index, const char* type
    ) const GEO_NORETURN ;
 
    static constexpr index_t MAX_LINE_LEN = 65535;
 
    FILE* F_;
    std::string file_name_;
    size_t line_num_;
    char line_[MAX_LINE_LEN];
    std::vector<char*> field_;
    bool ok_;
    };
}
 
#endif