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#ifndef NVIM_VIML_PARSER_PARSER_H
#define NVIM_VIML_PARSER_PARSER_H
#include <stdbool.h>
#include <stddef.h>
#include <assert.h>
#include "nvim/lib/kvec.h"
#include "nvim/func_attr.h"
/// One parsed line
typedef struct {
const char *data; ///< Parsed line pointer
size_t size; ///< Parsed line size
} ParserLine;
/// Line getter type for parser
///
/// Line getter must return {NULL, 0} for EOF.
typedef void (*ParserLineGetter)(void *cookie, ParserLine *ret_pline);
/// Parser position in the input
typedef struct {
size_t line; ///< Line index in ParserInputReader.lines.
size_t col; ///< Byte index in the line.
} ParserPosition;
/// Parser state item.
typedef struct {
enum {
kPTopStateParsingCommand = 0,
kPTopStateParsingExpression,
} type;
union {
struct {
enum {
kExprUnknown = 0,
} type;
} expr;
} data;
} ParserStateItem;
/// Structure defining input reader
typedef struct {
/// Function used to get next line.
ParserLineGetter get_line;
/// Data for get_line function.
void *cookie;
/// All lines obtained by get_line.
kvec_withinit_t(ParserLine, 4) lines;
} ParserInputReader;
/// Highlighted region definition
///
/// Note: one chunk may highlight only one line.
typedef struct {
ParserPosition start; ///< Start of the highlight: line and column.
size_t end_col; ///< End column, points to the start of the next character.
const char *group; ///< Highlight group.
} ParserHighlightChunk;
/// Highlighting defined by a parser
typedef kvec_withinit_t(ParserHighlightChunk, 16) ParserHighlight;
/// Structure defining parser state
typedef struct {
/// Line reader.
ParserInputReader reader;
/// Position up to which input was parsed.
ParserPosition pos;
/// Parser state stack.
kvec_withinit_t(ParserStateItem, 16) stack;
/// Highlighting support.
ParserHighlight *colors;
/// True if line continuation can be used.
bool can_continuate;
} ParserState;
static inline bool viml_parser_get_remaining_line(ParserState *const pstate,
ParserLine *const ret_pline)
REAL_FATTR_ALWAYS_INLINE REAL_FATTR_WARN_UNUSED_RESULT REAL_FATTR_NONNULL_ALL;
/// Get currently parsed line, shifted to pstate->pos.col
///
/// @param pstate Parser state to operate on.
///
/// @return True if there is a line, false in case of EOF.
static inline bool viml_parser_get_remaining_line(ParserState *const pstate,
ParserLine *const ret_pline)
{
const size_t num_lines = kv_size(pstate->reader.lines);
if (pstate->pos.line == num_lines) {
pstate->reader.get_line(pstate->reader.cookie, ret_pline);
kvi_push(pstate->reader.lines, *ret_pline);
} else {
*ret_pline = kv_last(pstate->reader.lines);
}
assert(pstate->pos.line == kv_size(pstate->reader.lines) - 1);
if (ret_pline->data != NULL) {
ret_pline->data += pstate->pos.col;
ret_pline->size -= pstate->pos.col;
}
return ret_pline->data != NULL;
}
static inline void viml_parser_advance(ParserState *const pstate,
const size_t len)
REAL_FATTR_ALWAYS_INLINE REAL_FATTR_NONNULL_ALL;
/// Advance position by a given number of bytes
///
/// At maximum advances to the next line.
///
/// @param pstate Parser state to advance.
/// @param[in] len Number of bytes to advance.
static inline void viml_parser_advance(ParserState *const pstate,
const size_t len)
{
assert(pstate->pos.line == kv_size(pstate->reader.lines) - 1);
const ParserLine pline = kv_last(pstate->reader.lines);
if (pstate->pos.col + len >= pline.size) {
pstate->pos.line++;
pstate->pos.col = 0;
} else {
pstate->pos.col += len;
}
}
#endif // NVIM_VIML_PARSER_PARSER_H
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