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/* SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once
#include "BLI_string_ref.hh"
/*
* Various text parsing utilities used by OBJ importer.
*
* Many of these functions take two pointers (p, end) indicating
* which part of a string to operate on, and return a possibly
* changed new start of the string. They could be taking a StringRef
* as input and returning a new StringRef, but this is a hot path
* in OBJ parsing, and the StringRef approach does lose performance
* (mostly due to return of StringRef being two register-size values
* instead of just one pointer).
*/
namespace blender::io::obj {
/**
* Fetches next line from an input string buffer.
*
* The returned line will not have '\n' characters at the end;
* the `buffer` is modified to contain remaining text without
* the input line.
*/
StringRef read_next_line(StringRef &buffer);
/**
* Fix up OBJ line continuations by replacing backslash (\) and the
* following newline with spaces.
*/
void fixup_line_continuations(char *p, char *end);
/**
* Drop leading white-space from a string part.
*/
const char *drop_whitespace(const char *p, const char *end);
/**
* Drop leading non-white-space from a string part.
*/
const char *drop_non_whitespace(const char *p, const char *end);
/**
* Parse an integer from an input string.
* The parsed result is stored in `dst`. The function skips
* leading white-space unless `skip_space=false`. If the
* number can't be parsed (invalid syntax, out of range),
* `fallback` value is stored instead.
*
* Returns the start of remainder of the input string after parsing.
*/
const char *parse_int(
const char *p, const char *end, int fallback, int &dst, bool skip_space = true);
/**
* Parse a float from an input string.
* The parsed result is stored in `dst`. The function skips
* leading white-space unless `skip_space=false`. If the
* number can't be parsed (invalid syntax, out of range),
* `fallback` value is stored instead. If `require_trailing_space`
* is true, the character after the number has to be whitespace.
*
* Returns the start of remainder of the input string after parsing.
*/
const char *parse_float(const char *p,
const char *end,
float fallback,
float &dst,
bool skip_space = true,
bool require_trailing_space = false);
/**
* Parse a number of white-space separated floats from an input string.
* The parsed `count` numbers are stored in `dst`. If a
* number can't be parsed (invalid syntax, out of range),
* `fallback` value is stored instead.
*
* Returns the start of remainder of the input string after parsing.
*/
const char *parse_floats(const char *p,
const char *end,
float fallback,
float *dst,
int count,
bool require_trailing_space = false);
} // namespace blender::io::obj
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