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neovim/src/nvim/highlight.c

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// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
// highlight.c: low level code for UI and syntax highlighting
#include <assert.h>
#include <inttypes.h>
#include <limits.h>
#include <string.h>
#include "klib/kvec.h"
#include "lauxlib.h"
#include "nvim/api/private/defs.h"
#include "nvim/api/private/helpers.h"
#include "nvim/api/private/validate.h"
#include "nvim/api/ui.h"
#include "nvim/decoration_provider.h"
#include "nvim/drawscreen.h"
#include "nvim/gettext.h"
#include "nvim/globals.h"
#include "nvim/highlight.h"
#include "nvim/highlight_defs.h"
#include "nvim/highlight_group.h"
#include "nvim/log.h"
#include "nvim/lua/executor.h"
#include "nvim/macros.h"
#include "nvim/map.h"
#include "nvim/memory.h"
#include "nvim/message.h"
#include "nvim/option.h"
#include "nvim/popupmenu.h"
#include "nvim/types.h"
#include "nvim/ui.h"
#include "nvim/vim.h"
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "highlight.c.generated.h"
#endif
static bool hlstate_active = false;
static kvec_t(HlEntry) attr_entries = KV_INITIAL_VALUE;
static Map(HlEntry, int) attr_entry_ids = MAP_INIT;
static Map(int, int) combine_attr_entries = MAP_INIT;
static Map(int, int) blend_attr_entries = MAP_INIT;
static Map(int, int) blendthrough_attr_entries = MAP_INIT;
/// highlight entries private to a namespace
static Map(ColorKey, ColorItem) ns_hls;
typedef int NSHlAttr[HLF_COUNT + 1];
static PMap(handle_T) ns_hl_attr;
void highlight_init(void)
{
// index 0 is no attribute, add dummy entry:
kv_push(attr_entries, ((HlEntry){ .attr = HLATTRS_INIT, .kind = kHlUnknown,
.id1 = 0, .id2 = 0 }));
}
/// @return true if hl table was reset
bool highlight_use_hlstate(void)
{
if (hlstate_active) {
return false;
}
hlstate_active = true;
// hl tables must now be rebuilt.
clear_hl_tables(true);
return true;
}
/// Return the attr number for a set of colors and font, and optionally
/// a semantic description (see ext_hlstate documentation).
/// Add a new entry to the attr_entries array if the combination is new.
/// @return 0 for error.
static int get_attr_entry(HlEntry entry)
{
if (!hlstate_active) {
// This information will not be used, erase it and reduce the table size.
entry.kind = kHlUnknown;
entry.id1 = 0;
entry.id2 = 0;
}
int id = map_get(HlEntry, int)(&attr_entry_ids, entry);
if (id > 0) {
return id;
}
static bool recursive = false;
if (kv_size(attr_entries) > MAX_TYPENR) {
// Running out of attribute entries! remove all attributes, and
// compute new ones for all groups.
// When called recursively, we are really out of numbers.
if (recursive) {
emsg(_("E424: Too many different highlighting attributes in use"));
return 0;
}
recursive = true;
clear_hl_tables(true);
recursive = false;
if (entry.kind == kHlCombine) {
// This entry is now invalid, don't put it
return 0;
}
}
size_t next_id = kv_size(attr_entries);
if (next_id > INT_MAX) {
ELOG("The index on attr_entries has overflowed");
return 0;
}
id = (int)next_id;
kv_push(attr_entries, entry);
map_put(HlEntry, int)(&attr_entry_ids, entry, id);
Array inspect = hl_inspect(id);
// Note: internally we don't distinguish between cterm and rgb attributes,
// remote_ui_hl_attr_define will however.
ui_call_hl_attr_define(id, entry.attr, entry.attr, inspect);
api_free_array(inspect);
return id;
}
/// When a UI connects, we need to send it the table of highlights used so far.
void ui_send_all_hls(UI *ui)
{
for (size_t i = 1; i < kv_size(attr_entries); i++) {
Array inspect = hl_inspect((int)i);
remote_ui_hl_attr_define(ui, (Integer)i, kv_A(attr_entries, i).attr,
kv_A(attr_entries, i).attr, inspect);
api_free_array(inspect);
}
for (size_t hlf = 0; hlf < HLF_COUNT; hlf++) {
remote_ui_hl_group_set(ui, cstr_as_string((char *)hlf_names[hlf]),
highlight_attr[hlf]);
}
}
/// Get attribute code for a syntax group.
int hl_get_syn_attr(int ns_id, int idx, HlAttrs at_en)
{
// TODO(bfredl): should we do this unconditionally
if (at_en.cterm_fg_color != 0 || at_en.cterm_bg_color != 0
|| at_en.rgb_fg_color != -1 || at_en.rgb_bg_color != -1
|| at_en.rgb_sp_color != -1 || at_en.cterm_ae_attr != 0
|| at_en.rgb_ae_attr != 0 || ns_id != 0) {
return get_attr_entry((HlEntry){ .attr = at_en, .kind = kHlSyntax,
.id1 = idx, .id2 = ns_id });
}
// If all the fields are cleared, clear the attr field back to default value
return 0;
}
void ns_hl_def(NS ns_id, int hl_id, HlAttrs attrs, int link_id, Dict(highlight) *dict)
{
if (ns_id == 0) {
assert(dict);
// set in global (':highlight') namespace
set_hl_group(hl_id, attrs, dict, link_id);
return;
}
if ((attrs.rgb_ae_attr & HL_DEFAULT)
&& map_has(ColorKey, ColorItem)(&ns_hls, ColorKey(ns_id, hl_id))) {
return;
}
DecorProvider *p = get_decor_provider(ns_id, true);
int attr_id = link_id > 0 ? -1 : hl_get_syn_attr(ns_id, hl_id, attrs);
ColorItem it = { .attr_id = attr_id,
.link_id = link_id,
.version = p->hl_valid,
.is_default = (attrs.rgb_ae_attr & HL_DEFAULT),
.link_global = (attrs.rgb_ae_attr & HL_GLOBAL) };
map_put(ColorKey, ColorItem)(&ns_hls, ColorKey(ns_id, hl_id), it);
p->hl_cached = false;
}
int ns_get_hl(NS *ns_hl, int hl_id, bool link, bool nodefault)
{
static int recursive = 0;
if (*ns_hl == 0) {
// ns=0 (the default namespace) does not have a provider so stop here
return -1;
}
if (*ns_hl < 0) {
if (ns_hl_active <= 0) {
return -1;
}
*ns_hl = ns_hl_active;
}
int ns_id = *ns_hl;
DecorProvider *p = get_decor_provider(ns_id, true);
ColorItem it = map_get(ColorKey, ColorItem)(&ns_hls, ColorKey(ns_id, hl_id));
// TODO(bfredl): map_ref true even this?
bool valid_item = it.version >= p->hl_valid;
if (!valid_item && p->hl_def != LUA_NOREF && !recursive) {
MAXSIZE_TEMP_ARRAY(args, 3);
ADD_C(args, INTEGER_OBJ((Integer)ns_id));
ADD_C(args, STRING_OBJ(cstr_to_string(syn_id2name(hl_id))));
ADD_C(args, BOOLEAN_OBJ(link));
// TODO(bfredl): preload the "global" attr dict?
Error err = ERROR_INIT;
recursive++;
Object ret = nlua_call_ref(p->hl_def, "hl_def", args, true, &err);
recursive--;
// TODO(bfredl): or "inherit", combine with global value?
bool fallback = true;
int tmp = false;
HlAttrs attrs = HLATTRS_INIT;
if (ret.type == kObjectTypeDictionary) {
fallback = false;
Dict(highlight) dict = { 0 };
if (api_dict_to_keydict(&dict, KeyDict_highlight_get_field,
ret.data.dictionary, &err)) {
attrs = dict2hlattrs(&dict, true, &it.link_id, &err);
fallback = api_object_to_bool(dict.fallback, "fallback", true, &err);
tmp = api_object_to_bool(dict.fallback, "tmp", false, &err);
if (it.link_id >= 0) {
fallback = true;
}
}
}
it.attr_id = fallback ? -1 : hl_get_syn_attr(ns_id, hl_id, attrs);
it.version = p->hl_valid - tmp;
it.is_default = attrs.rgb_ae_attr & HL_DEFAULT;
it.link_global = attrs.rgb_ae_attr & HL_GLOBAL;
map_put(ColorKey, ColorItem)(&ns_hls, ColorKey(ns_id, hl_id), it);
valid_item = true;
}
if ((it.is_default && nodefault) || !valid_item) {
return -1;
}
if (link) {
if (it.attr_id >= 0) {
return 0;
}
if (it.link_global) {
*ns_hl = 0;
}
return it.link_id;
} else {
return it.attr_id;
}
}
bool hl_check_ns(void)
{
int ns = 0;
if (ns_hl_fast > 0) {
ns = ns_hl_fast;
} else if (ns_hl_win >= 0) {
ns = ns_hl_win;
} else {
ns = ns_hl_global;
}
if (ns_hl_active == ns) {
return false;
}
ns_hl_active = ns;
hl_attr_active = highlight_attr;
if (ns > 0) {
update_ns_hl(ns);
NSHlAttr *hl_def = (NSHlAttr *)pmap_get(handle_T)(&ns_hl_attr, ns);
if (hl_def) {
hl_attr_active = *hl_def;
}
}
need_highlight_changed = true;
return true;
}
/// prepare for drawing window `wp` or global elements if NULL
///
/// Note: pum should be drawn in the context of the current window!
bool win_check_ns_hl(win_T *wp)
{
ns_hl_win = wp ? wp->w_ns_hl : -1;
return hl_check_ns();
}
/// Get attribute code for a builtin highlight group.
///
/// The final syntax group could be modified by hi-link or 'winhighlight'.
int hl_get_ui_attr(int ns_id, int idx, int final_id, bool optional)
{
HlAttrs attrs = HLATTRS_INIT;
bool available = false;
if (final_id > 0) {
int syn_attr = syn_ns_id2attr(ns_id, final_id, optional);
if (syn_attr > 0) {
attrs = syn_attr2entry(syn_attr);
available = true;
}
}
if (HLF_PNI <= idx && idx <= HLF_PST) {
if (attrs.hl_blend == -1 && p_pb > 0) {
attrs.hl_blend = (int)p_pb;
}
if (pum_drawn()) {
must_redraw_pum = true;
}
}
if (optional && !available) {
return 0;
}
return get_attr_entry((HlEntry){ .attr = attrs, .kind = kHlUI,
.id1 = idx, .id2 = final_id });
}
void update_window_hl(win_T *wp, bool invalid)
{
int ns_id = wp->w_ns_hl;
update_ns_hl(ns_id);
if (ns_id != wp->w_ns_hl_active || wp->w_ns_hl_attr == NULL) {
wp->w_ns_hl_active = ns_id;
wp->w_ns_hl_attr = *(NSHlAttr *)pmap_get(handle_T)(&ns_hl_attr, ns_id);
if (!wp->w_ns_hl_attr) {
// No specific highlights, use the defaults.
wp->w_ns_hl_attr = highlight_attr;
}
}
int *hl_def = wp->w_ns_hl_attr;
if (!wp->w_hl_needs_update && !invalid) {
return;
}
wp->w_hl_needs_update = false;
// If a floating window is blending it always have a named
// wp->w_hl_attr_normal group. HL_ATTR(HLF_NFLOAT) is always named.
// determine window specific background set in 'winhighlight'
bool float_win = wp->w_floating && !wp->w_float_config.external;
if (float_win && hl_def[HLF_NFLOAT] != 0) {
wp->w_hl_attr_normal = hl_def[HLF_NFLOAT];
} else if (hl_def[HLF_COUNT] > 0) {
wp->w_hl_attr_normal = hl_def[HLF_COUNT];
} else {
wp->w_hl_attr_normal = float_win ? HL_ATTR(HLF_NFLOAT) : 0;
}
// if blend= attribute is not set, 'winblend' value overrides it.
if (wp->w_floating && wp->w_p_winbl > 0) {
HlEntry entry = kv_A(attr_entries, wp->w_hl_attr_normal);
if (entry.attr.hl_blend == -1) {
entry.attr.hl_blend = (int)wp->w_p_winbl;
wp->w_hl_attr_normal = get_attr_entry(entry);
}
}
wp->w_float_config.shadow = false;
if (wp->w_floating && wp->w_float_config.border) {
for (int i = 0; i < 8; i++) {
int attr = hl_def[HLF_BORDER];
if (wp->w_float_config.border_hl_ids[i]) {
attr = hl_get_ui_attr(ns_id, HLF_BORDER,
wp->w_float_config.border_hl_ids[i], false);
HlAttrs a = syn_attr2entry(attr);
if (a.hl_blend) {
wp->w_float_config.shadow = true;
}
}
wp->w_float_config.border_attr[i] = attr;
}
}
// shadow might cause blending
check_blending(wp);
// TODO(bfredl): this a bit ad-hoc. move it from highlight ns logic to 'winhl'
// implementation?
if (hl_def[HLF_INACTIVE] == 0) {
wp->w_hl_attr_normalnc = hl_combine_attr(HL_ATTR(HLF_INACTIVE),
wp->w_hl_attr_normal);
} else {
wp->w_hl_attr_normalnc = hl_def[HLF_INACTIVE];
}
}
void update_ns_hl(int ns_id)
{
if (ns_id <= 0) {
return;
}
DecorProvider *p = get_decor_provider(ns_id, true);
if (p->hl_cached) {
return;
}
NSHlAttr **alloc = (NSHlAttr **)pmap_ref(handle_T)(&ns_hl_attr, ns_id, true);
if (*alloc == NULL) {
*alloc = xmalloc(sizeof(**alloc));
}
int *hl_attrs = **alloc;
for (int hlf = 0; hlf < HLF_COUNT; hlf++) {
int id = syn_check_group(hlf_names[hlf], strlen(hlf_names[hlf]));
bool optional = (hlf == HLF_INACTIVE || hlf == HLF_NFLOAT);
hl_attrs[hlf] = hl_get_ui_attr(ns_id, hlf, id, optional);
}
// NOOOO! You cannot just pretend that "Normal" is just like any other
// syntax group! It needs at least 10 layers of special casing! Noooooo!
//
// haha, tema engine go brrr
int normality = syn_check_group(S_LEN("Normal"));
hl_attrs[HLF_COUNT] = hl_get_ui_attr(ns_id, -1, normality, true);
// hl_get_ui_attr might have invalidated the decor provider
p = get_decor_provider(ns_id, true);
p->hl_cached = true;
}
int win_bg_attr(win_T *wp)
{
if (ns_hl_fast < 0) {
int local = (wp == curwin) ? wp->w_hl_attr_normal : wp->w_hl_attr_normalnc;
if (local) {
return local;
}
}
if (wp == curwin || hl_attr_active[HLF_INACTIVE] == 0) {
return hl_attr_active[HLF_COUNT];
} else {
return hl_attr_active[HLF_INACTIVE];
}
}
/// Gets HL_UNDERLINE highlight.
int hl_get_underline(void)
{
return get_attr_entry((HlEntry){
.attr = (HlAttrs){
.cterm_ae_attr = (int16_t)HL_UNDERLINE,
.cterm_fg_color = 0,
.cterm_bg_color = 0,
.rgb_ae_attr = (int16_t)HL_UNDERLINE,
.rgb_fg_color = -1,
.rgb_bg_color = -1,
.rgb_sp_color = -1,
.hl_blend = -1,
},
.kind = kHlUI,
.id1 = 0,
.id2 = 0,
});
}
/// Get attribute code for forwarded :terminal highlights.
int hl_get_term_attr(HlAttrs *aep)
{
return get_attr_entry((HlEntry){ .attr= *aep, .kind = kHlTerminal,
.id1 = 0, .id2 = 0 });
}
/// Clear all highlight tables.
void clear_hl_tables(bool reinit)
{
if (reinit) {
kv_size(attr_entries) = 1;
map_clear(HlEntry, int)(&attr_entry_ids);
map_clear(int, int)(&combine_attr_entries);
map_clear(int, int)(&blend_attr_entries);
map_clear(int, int)(&blendthrough_attr_entries);
memset(highlight_attr_last, -1, sizeof(highlight_attr_last));
highlight_attr_set_all();
highlight_changed();
screen_invalidate_highlights();
} else {
kv_destroy(attr_entries);
map_destroy(HlEntry, int)(&attr_entry_ids);
map_destroy(int, int)(&combine_attr_entries);
map_destroy(int, int)(&blend_attr_entries);
map_destroy(int, int)(&blendthrough_attr_entries);
map_destroy(ColorKey, ColorItem)(&ns_hls);
}
}
void hl_invalidate_blends(void)
{
map_clear(int, int)(&blend_attr_entries);
map_clear(int, int)(&blendthrough_attr_entries);
highlight_changed();
update_window_hl(curwin, true);
}
/// Combine HlAttrFlags.
/// The underline attribute in "prim_ae" overrules the one in "char_ae" if both are present.
static int16_t hl_combine_ae(int16_t char_ae, int16_t prim_ae)
{
int16_t char_ul = char_ae & HL_UNDERLINE_MASK;
int16_t prim_ul = prim_ae & HL_UNDERLINE_MASK;
int16_t new_ul = prim_ul ? prim_ul : char_ul;
return (char_ae & ~HL_UNDERLINE_MASK) | (prim_ae & ~HL_UNDERLINE_MASK) | new_ul;
}
// Combine special attributes (e.g., for spelling) with other attributes
// (e.g., for syntax highlighting).
// "prim_attr" overrules "char_attr".
// This creates a new group when required.
// Since we expect there to be a lot of spelling mistakes we cache the result.
// Return the resulting attributes.
int hl_combine_attr(int char_attr, int prim_attr)
{
if (char_attr == 0) {
return prim_attr;
} else if (prim_attr == 0) {
return char_attr;
}
// TODO(bfredl): could use a struct for clearer intent.
int combine_tag = (char_attr << 16) + prim_attr;
int id = map_get(int, int)(&combine_attr_entries, combine_tag);
if (id > 0) {
return id;
}
HlAttrs char_aep = syn_attr2entry(char_attr);
HlAttrs prim_aep = syn_attr2entry(prim_attr);
// start with low-priority attribute, and override colors if present below.
HlAttrs new_en = char_aep;
if (prim_aep.cterm_ae_attr & HL_NOCOMBINE) {
new_en.cterm_ae_attr = prim_aep.cterm_ae_attr;
} else {
new_en.cterm_ae_attr = hl_combine_ae(new_en.cterm_ae_attr, prim_aep.cterm_ae_attr);
}
if (prim_aep.rgb_ae_attr & HL_NOCOMBINE) {
new_en.rgb_ae_attr = prim_aep.rgb_ae_attr;
} else {
new_en.rgb_ae_attr = hl_combine_ae(new_en.rgb_ae_attr, prim_aep.rgb_ae_attr);
}
if (prim_aep.cterm_fg_color > 0) {
new_en.cterm_fg_color = prim_aep.cterm_fg_color;
new_en.rgb_ae_attr &= ((~HL_FG_INDEXED)
| (prim_aep.rgb_ae_attr & HL_FG_INDEXED));
}
if (prim_aep.cterm_bg_color > 0) {
new_en.cterm_bg_color = prim_aep.cterm_bg_color;
new_en.rgb_ae_attr &= ((~HL_BG_INDEXED)
| (prim_aep.rgb_ae_attr & HL_BG_INDEXED));
}
if (prim_aep.rgb_fg_color >= 0) {
new_en.rgb_fg_color = prim_aep.rgb_fg_color;
new_en.rgb_ae_attr &= ((~HL_FG_INDEXED)
| (prim_aep.rgb_ae_attr & HL_FG_INDEXED));
}
if (prim_aep.rgb_bg_color >= 0) {
new_en.rgb_bg_color = prim_aep.rgb_bg_color;
new_en.rgb_ae_attr &= ((~HL_BG_INDEXED)
| (prim_aep.rgb_ae_attr & HL_BG_INDEXED));
}
if (prim_aep.rgb_sp_color >= 0) {
new_en.rgb_sp_color = prim_aep.rgb_sp_color;
}
if (prim_aep.hl_blend >= 0) {
new_en.hl_blend = prim_aep.hl_blend;
}
id = get_attr_entry((HlEntry){ .attr = new_en, .kind = kHlCombine,
.id1 = char_attr, .id2 = prim_attr });
if (id > 0) {
map_put(int, int)(&combine_attr_entries, combine_tag, id);
}
return id;
}
/// Get the used rgb colors for an attr group.
///
/// If colors are unset, use builtin default colors. Never returns -1
/// Cterm colors are unchanged.
static HlAttrs get_colors_force(int attr)
{
HlAttrs attrs = syn_attr2entry(attr);
if (attrs.rgb_bg_color == -1) {
attrs.rgb_bg_color = normal_bg;
}
if (attrs.rgb_fg_color == -1) {
attrs.rgb_fg_color = normal_fg;
}
if (attrs.rgb_sp_color == -1) {
attrs.rgb_sp_color = normal_sp;
}
HL_SET_DEFAULT_COLORS(attrs.rgb_fg_color, attrs.rgb_bg_color,
attrs.rgb_sp_color);
if (attrs.rgb_ae_attr & HL_INVERSE) {
int temp = attrs.rgb_bg_color;
attrs.rgb_bg_color = attrs.rgb_fg_color;
attrs.rgb_fg_color = temp;
attrs.rgb_ae_attr &= ~HL_INVERSE;
}
return attrs;
}
/// Blend overlay attributes (for popupmenu) with other attributes
///
/// This creates a new group when required.
/// This is called per-cell, so cache the result.
///
/// @return the resulting attributes.
int hl_blend_attrs(int back_attr, int front_attr, bool *through)
{
if (front_attr < 0 || back_attr < 0) {
return -1;
}
HlAttrs fattrs = get_colors_force(front_attr);
int ratio = fattrs.hl_blend;
if (ratio <= 0) {
*through = false;
return front_attr;
}
int combine_tag = (back_attr << 16) + front_attr;
Map(int, int) *map = (*through
? &blendthrough_attr_entries
: &blend_attr_entries);
int id = map_get(int, int)(map, combine_tag);
if (id > 0) {
return id;
}
HlAttrs battrs = get_colors_force(back_attr);
HlAttrs cattrs;
if (*through) {
cattrs = battrs;
cattrs.rgb_fg_color = rgb_blend(ratio, battrs.rgb_fg_color,
fattrs.rgb_bg_color);
if (cattrs.rgb_ae_attr & (HL_UNDERLINE_MASK)) {
cattrs.rgb_sp_color = rgb_blend(ratio, battrs.rgb_sp_color,
fattrs.rgb_bg_color);
} else {
cattrs.rgb_sp_color = -1;
}
cattrs.cterm_bg_color = fattrs.cterm_bg_color;
cattrs.cterm_fg_color = cterm_blend(ratio, battrs.cterm_fg_color,
fattrs.cterm_bg_color);
cattrs.rgb_ae_attr &= ~(HL_FG_INDEXED | HL_BG_INDEXED);
} else {
cattrs = fattrs;
if (ratio >= 50) {
cattrs.rgb_ae_attr = hl_combine_ae(battrs.rgb_ae_attr, cattrs.rgb_ae_attr);
}
cattrs.rgb_fg_color = rgb_blend(ratio/2, battrs.rgb_fg_color,
fattrs.rgb_fg_color);
if (cattrs.rgb_ae_attr & (HL_UNDERLINE_MASK)) {
cattrs.rgb_sp_color = rgb_blend(ratio/2, battrs.rgb_bg_color,
fattrs.rgb_sp_color);
} else {
cattrs.rgb_sp_color = -1;
}
cattrs.rgb_ae_attr &= ~HL_BG_INDEXED;
}
cattrs.rgb_bg_color = rgb_blend(ratio, battrs.rgb_bg_color,
fattrs.rgb_bg_color);
cattrs.hl_blend = -1; // blend property was consumed
HlKind kind = *through ? kHlBlendThrough : kHlBlend;
id = get_attr_entry((HlEntry){ .attr = cattrs, .kind = kind,
.id1 = back_attr, .id2 = front_attr });
if (id > 0) {
map_put(int, int)(map, combine_tag, id);
}
return id;
}
static int rgb_blend(int ratio, int rgb1, int rgb2)
{
int a = ratio, b = 100 - ratio;
int r1 = (rgb1 & 0xFF0000) >> 16;
int g1 = (rgb1 & 0x00FF00) >> 8;
int b1 = (rgb1 & 0x0000FF) >> 0;
int r2 = (rgb2 & 0xFF0000) >> 16;
int g2 = (rgb2 & 0x00FF00) >> 8;
int b2 = (rgb2 & 0x0000FF) >> 0;
int mr = (a * r1 + b * r2)/100;
int mg = (a * g1 + b * g2)/100;
int mb = (a * b1 + b * b2)/100;
return (mr << 16) + (mg << 8) + mb;
}
static int cterm_blend(int ratio, int c1, int c2)
{
// 1. Convert cterm color numbers to RGB.
// 2. Blend the RGB colors.
// 3. Convert the RGB result to a cterm color.
int rgb1 = hl_cterm2rgb_color(c1);
int rgb2 = hl_cterm2rgb_color(c2);
int rgb_blended = rgb_blend(ratio, rgb1, rgb2);
return hl_rgb2cterm_color(rgb_blended);
}
/// Converts RGB color to 8-bit color (0-255).
static int hl_rgb2cterm_color(int rgb)
{
int r = (rgb & 0xFF0000) >> 16;
int g = (rgb & 0x00FF00) >> 8;
int b = (rgb & 0x0000FF) >> 0;
return (r * 6 / 256) * 36 + (g * 6 / 256) * 6 + (b * 6 / 256);
}
/// Converts 8-bit color (0-255) to RGB color.
/// This is compatible with xterm.
static int hl_cterm2rgb_color(int nr)
{
static int cube_value[] = {
0x00, 0x5F, 0x87, 0xAF, 0xD7, 0xFF
};
static int grey_ramp[] = {
0x08, 0x12, 0x1C, 0x26, 0x30, 0x3A, 0x44, 0x4E, 0x58, 0x62, 0x6C, 0x76,
0x80, 0x8A, 0x94, 0x9E, 0xA8, 0xB2, 0xBC, 0xC6, 0xD0, 0xDA, 0xE4, 0xEE
};
static uint8_t ansi_table[16][4] = {
// R G B idx
{ 0, 0, 0, 1 }, // black
{ 224, 0, 0, 2 }, // dark red
{ 0, 224, 0, 3 }, // dark green
{ 224, 224, 0, 4 }, // dark yellow / brown
{ 0, 0, 224, 5 }, // dark blue
{ 224, 0, 224, 6 }, // dark magenta
{ 0, 224, 224, 7 }, // dark cyan
{ 224, 224, 224, 8 }, // light grey
{ 128, 128, 128, 9 }, // dark grey
{ 255, 64, 64, 10 }, // light red
{ 64, 255, 64, 11 }, // light green
{ 255, 255, 64, 12 }, // yellow
{ 64, 64, 255, 13 }, // light blue
{ 255, 64, 255, 14 }, // light magenta
{ 64, 255, 255, 15 }, // light cyan
{ 255, 255, 255, 16 }, // white
};
int r = 0;
int g = 0;
int b = 0;
int idx;
// *ansi_idx = 0;
if (nr < 16) {
r = ansi_table[nr][0];
g = ansi_table[nr][1];
b = ansi_table[nr][2];
// *ansi_idx = ansi_table[nr][3];
} else if (nr < 232) { // 216 color-cube
idx = nr - 16;
r = cube_value[idx / 36 % 6];
g = cube_value[idx / 6 % 6];
b = cube_value[idx % 6];
// *ansi_idx = -1;
} else if (nr < 256) { // 24 greyscale ramp
idx = nr - 232;
r = grey_ramp[idx];
g = grey_ramp[idx];
b = grey_ramp[idx];
// *ansi_idx = -1;
}
return (r << 16) + (g << 8) + b;
}
/// Get highlight attributes for a attribute code
HlAttrs syn_attr2entry(int attr)
{
if (attr <= 0 || attr >= (int)kv_size(attr_entries)) {
// invalid attribute code, or the tables were cleared
return HLATTRS_INIT;
}
return kv_A(attr_entries, attr).attr;
}
/// Gets highlight description for id `attr_id` as a map.
Dictionary hl_get_attr_by_id(Integer attr_id, Boolean rgb, Arena *arena, Error *err)
{
Dictionary dic = ARRAY_DICT_INIT;
if (attr_id == 0) {
return dic;
}
if (attr_id <= 0 || attr_id >= (int)kv_size(attr_entries)) {
api_set_error(err, kErrorTypeException,
"Invalid attribute id: %" PRId64, attr_id);
return dic;
}
Dictionary retval = arena_dict(arena, HLATTRS_DICT_SIZE);
hlattrs2dict(&retval, NULL, syn_attr2entry((int)attr_id), rgb, false);
return retval;
}
/// Converts an HlAttrs into Dictionary
///
/// @param[in/out] hl Dictionary with pre-allocated space for HLATTRS_DICT_SIZE elements
/// @param[in] aep data to convert
/// @param use_rgb use 'gui*' settings if true, else resorts to 'cterm*'
/// @param short_keys change (foreground, background, special) to (fg, bg, sp) for 'gui*' settings
/// (foreground, background) to (ctermfg, ctermbg) for 'cterm*' settings
void hlattrs2dict(Dictionary *hl, Dictionary *hl_attrs, HlAttrs ae, bool use_rgb, bool short_keys)
{
hl_attrs = hl_attrs ? hl_attrs : hl;
assert(hl->capacity >= HLATTRS_DICT_SIZE); // at most 16 items
assert(hl_attrs->capacity >= HLATTRS_DICT_SIZE); // at most 16 items
int mask = use_rgb ? ae.rgb_ae_attr : ae.cterm_ae_attr;
if (mask & HL_INVERSE) {
PUT_C(*hl_attrs, "reverse", BOOLEAN_OBJ(true));
}
if (mask & HL_BOLD) {
PUT_C(*hl_attrs, "bold", BOOLEAN_OBJ(true));
}
if (mask & HL_ITALIC) {
PUT_C(*hl_attrs, "italic", BOOLEAN_OBJ(true));
}
switch (mask & HL_UNDERLINE_MASK) {
case HL_UNDERLINE:
PUT_C(*hl_attrs, "underline", BOOLEAN_OBJ(true));
break;
case HL_UNDERCURL:
PUT_C(*hl_attrs, "undercurl", BOOLEAN_OBJ(true));
break;
case HL_UNDERDOUBLE:
PUT_C(*hl_attrs, "underdouble", BOOLEAN_OBJ(true));
break;
case HL_UNDERDOTTED:
PUT_C(*hl_attrs, "underdotted", BOOLEAN_OBJ(true));
break;
case HL_UNDERDASHED:
PUT_C(*hl_attrs, "underdashed", BOOLEAN_OBJ(true));
break;
}
if (mask & HL_STANDOUT) {
PUT_C(*hl_attrs, "standout", BOOLEAN_OBJ(true));
}
if (mask & HL_STRIKETHROUGH) {
PUT_C(*hl_attrs, "strikethrough", BOOLEAN_OBJ(true));
}
if (mask & HL_ALTFONT) {
PUT_C(*hl_attrs, "altfont", BOOLEAN_OBJ(true));
}
if (mask & HL_NOCOMBINE) {
PUT_C(*hl_attrs, "nocombine", BOOLEAN_OBJ(true));
}
if (use_rgb) {
if (ae.rgb_fg_color != -1) {
PUT_C(*hl, short_keys ? "fg" : "foreground", INTEGER_OBJ(ae.rgb_fg_color));
}
if (ae.rgb_bg_color != -1) {
PUT_C(*hl, short_keys ? "bg" : "background", INTEGER_OBJ(ae.rgb_bg_color));
}
if (ae.rgb_sp_color != -1) {
PUT_C(*hl, short_keys ? "sp" : "special", INTEGER_OBJ(ae.rgb_sp_color));
}
if (!short_keys) {
if (mask & HL_FG_INDEXED) {
PUT_C(*hl, "fg_indexed", BOOLEAN_OBJ(true));
}
if (mask & HL_BG_INDEXED) {
PUT_C(*hl, "bg_indexed", BOOLEAN_OBJ(true));
}
}
} else {
if (ae.cterm_fg_color != 0) {
PUT_C(*hl, short_keys ? "ctermfg" : "foreground", INTEGER_OBJ(ae.cterm_fg_color - 1));
}
if (ae.cterm_bg_color != 0) {
PUT_C(*hl, short_keys ? "ctermbg" : "background", INTEGER_OBJ(ae.cterm_bg_color - 1));
}
}
if (ae.hl_blend > -1 && (use_rgb || !short_keys)) {
PUT_C(*hl, "blend", INTEGER_OBJ(ae.hl_blend));
}
}
HlAttrs dict2hlattrs(Dict(highlight) *dict, bool use_rgb, int *link_id, Error *err)
{
HlAttrs hlattrs = HLATTRS_INIT;
int32_t fg = -1, bg = -1, ctermfg = -1, ctermbg = -1, sp = -1;
int blend = -1;
int16_t mask = 0;
int16_t cterm_mask = 0;
bool cterm_mask_provided = false;
#define CHECK_FLAG(d, m, name, extra, flag) \
if (api_object_to_bool(d->name##extra, #name, false, err)) { \
if (flag & HL_UNDERLINE_MASK) { \
m &= ~HL_UNDERLINE_MASK; \
} \
m |= flag; \
}
CHECK_FLAG(dict, mask, reverse, , HL_INVERSE);
CHECK_FLAG(dict, mask, bold, , HL_BOLD);
CHECK_FLAG(dict, mask, italic, , HL_ITALIC);
CHECK_FLAG(dict, mask, underline, , HL_UNDERLINE);
CHECK_FLAG(dict, mask, undercurl, , HL_UNDERCURL);
CHECK_FLAG(dict, mask, underdouble, , HL_UNDERDOUBLE);
CHECK_FLAG(dict, mask, underdotted, , HL_UNDERDOTTED);
CHECK_FLAG(dict, mask, underdashed, , HL_UNDERDASHED);
CHECK_FLAG(dict, mask, standout, , HL_STANDOUT);
CHECK_FLAG(dict, mask, strikethrough, , HL_STRIKETHROUGH);
CHECK_FLAG(dict, mask, altfont, , HL_ALTFONT);
if (use_rgb) {
CHECK_FLAG(dict, mask, fg_indexed, , HL_FG_INDEXED);
CHECK_FLAG(dict, mask, bg_indexed, , HL_BG_INDEXED);
}
CHECK_FLAG(dict, mask, nocombine, , HL_NOCOMBINE);
CHECK_FLAG(dict, mask, default, _, HL_DEFAULT);
if (HAS_KEY(dict->fg)) {
fg = object_to_color(dict->fg, "fg", use_rgb, err);
} else if (HAS_KEY(dict->foreground)) {
fg = object_to_color(dict->foreground, "foreground", use_rgb, err);
}
if (ERROR_SET(err)) {
return hlattrs;
}
if (HAS_KEY(dict->bg)) {
bg = object_to_color(dict->bg, "bg", use_rgb, err);
} else if (HAS_KEY(dict->background)) {
bg = object_to_color(dict->background, "background", use_rgb, err);
}
if (ERROR_SET(err)) {
return hlattrs;
}
if (HAS_KEY(dict->sp)) {
sp = object_to_color(dict->sp, "sp", true, err);
} else if (HAS_KEY(dict->special)) {
sp = object_to_color(dict->special, "special", true, err);
}
if (ERROR_SET(err)) {
return hlattrs;
}
if (HAS_KEY(dict->blend)) {
VALIDATE_T("blend", kObjectTypeInteger, dict->blend.type, {
return hlattrs;
});
Integer blend0 = dict->blend.data.integer;
VALIDATE_RANGE((blend0 >= 0 && blend0 <= 100), "blend", {
return hlattrs;
});
blend = (int)blend0;
}
if (HAS_KEY(dict->link) || HAS_KEY(dict->global_link)) {
if (!link_id) {
api_set_error(err, kErrorTypeValidation, "Invalid Key: '%s'",
HAS_KEY(dict->global_link) ? "global_link" : "link");
return hlattrs;
}
if (HAS_KEY(dict->global_link)) {
*link_id = object_to_hl_id(dict->global_link, "link", err);
mask |= HL_GLOBAL;
} else {
*link_id = object_to_hl_id(dict->link, "link", err);
}
if (ERROR_SET(err)) {
return hlattrs;
}
}
// Handle cterm attrs
if (dict->cterm.type == kObjectTypeDictionary) {
Dict(highlight_cterm) cterm[1] = { 0 };
if (!api_dict_to_keydict(cterm, KeyDict_highlight_cterm_get_field,
dict->cterm.data.dictionary, err)) {
return hlattrs;
}
cterm_mask_provided = true;
CHECK_FLAG(cterm, cterm_mask, reverse, , HL_INVERSE);
CHECK_FLAG(cterm, cterm_mask, bold, , HL_BOLD);
CHECK_FLAG(cterm, cterm_mask, italic, , HL_ITALIC);
CHECK_FLAG(cterm, cterm_mask, underline, , HL_UNDERLINE);
CHECK_FLAG(cterm, cterm_mask, undercurl, , HL_UNDERCURL);
CHECK_FLAG(cterm, cterm_mask, standout, , HL_STANDOUT);
CHECK_FLAG(cterm, cterm_mask, strikethrough, , HL_STRIKETHROUGH);
CHECK_FLAG(cterm, cterm_mask, altfont, , HL_ALTFONT);
CHECK_FLAG(cterm, cterm_mask, nocombine, , HL_NOCOMBINE);
} else if (dict->cterm.type == kObjectTypeArray && dict->cterm.data.array.size == 0) {
// empty list from Lua API should clear all cterm attributes
// TODO(clason): handle via gen_api_dispatch
cterm_mask_provided = true;
} else if (HAS_KEY(dict->cterm)) {
VALIDATE_EXP(false, "cterm", "Dict", api_typename(dict->cterm.type), {
return hlattrs;
});
}
#undef CHECK_FLAG
if (HAS_KEY(dict->ctermfg)) {
ctermfg = object_to_color(dict->ctermfg, "ctermfg", false, err);
if (ERROR_SET(err)) {
return hlattrs;
}
}
if (HAS_KEY(dict->ctermbg)) {
ctermbg = object_to_color(dict->ctermbg, "ctermbg", false, err);
if (ERROR_SET(err)) {
return hlattrs;
}
}
if (use_rgb) {
// apply gui mask as default for cterm mask
if (!cterm_mask_provided) {
cterm_mask = mask;
}
hlattrs.rgb_ae_attr = mask;
hlattrs.rgb_bg_color = bg;
hlattrs.rgb_fg_color = fg;
hlattrs.rgb_sp_color = sp;
hlattrs.hl_blend = blend;
hlattrs.cterm_bg_color = ctermbg == -1 ? 0 : ctermbg + 1;
hlattrs.cterm_fg_color = ctermfg == -1 ? 0 : ctermfg + 1;
hlattrs.cterm_ae_attr = cterm_mask;
} else {
hlattrs.cterm_bg_color = bg == -1 ? 0 : bg + 1;
hlattrs.cterm_fg_color = fg == -1 ? 0 : fg + 1;
hlattrs.cterm_ae_attr = mask;
}
return hlattrs;
}
int object_to_color(Object val, char *key, bool rgb, Error *err)
{
if (val.type == kObjectTypeInteger) {
return (int)val.data.integer;
} else if (val.type == kObjectTypeString) {
String str = val.data.string;
// TODO(bfredl): be more fancy with "bg", "fg" etc
if (!str.size || STRICMP(str.data, "NONE") == 0) {
return -1;
}
int color;
if (rgb) {
int dummy;
color = name_to_color(str.data, &dummy);
} else {
color = name_to_ctermcolor(str.data);
}
VALIDATE_S((color >= 0), "highlight color", str.data, {
return color;
});
return color;
} else {
VALIDATE_EXP(false, key, "String or Integer", NULL, {
return 0;
});
}
}
Array hl_inspect(int attr)
{
// TODO(bfredl): use arena allocation
Array ret = ARRAY_DICT_INIT;
if (hlstate_active) {
hl_inspect_impl(&ret, attr);
}
return ret;
}
static void hl_inspect_impl(Array *arr, int attr)
{
Dictionary item = ARRAY_DICT_INIT;
if (attr <= 0 || attr >= (int)kv_size(attr_entries)) {
return;
}
HlEntry e = kv_A(attr_entries, attr);
switch (e.kind) {
case kHlSyntax:
PUT(item, "kind", STRING_OBJ(cstr_to_string("syntax")));
PUT(item, "hi_name",
STRING_OBJ(cstr_to_string(syn_id2name(e.id1))));
break;
case kHlUI:
PUT(item, "kind", STRING_OBJ(cstr_to_string("ui")));
const char *ui_name = (e.id1 == -1) ? "Normal" : hlf_names[e.id1];
PUT(item, "ui_name", STRING_OBJ(cstr_to_string(ui_name)));
PUT(item, "hi_name",
STRING_OBJ(cstr_to_string(syn_id2name(e.id2))));
break;
case kHlTerminal:
PUT(item, "kind", STRING_OBJ(cstr_to_string("term")));
break;
case kHlCombine:
case kHlBlend:
case kHlBlendThrough:
// attribute combination is associative, so flatten to an array
hl_inspect_impl(arr, e.id1);
hl_inspect_impl(arr, e.id2);
return;
case kHlUnknown:
return;
}
PUT(item, "id", INTEGER_OBJ(attr));
ADD(*arr, DICTIONARY_OBJ(item));
}
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