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// deals with textDocument/signatureHelp LSP requests
// this is the little thing which shows you the signature of the function and the current argument
#include "ted-internal.h"
/// a single signature in the signature help.
typedef struct {
/// displayed normal
char *label_pre;
/// displayed bold
char *label_active;
/// displayed normal
char *label_post;
} Signature;
struct SignatureHelp {
LSPServerRequestID last_request;
/// should we resend a signature help request this frame?
bool retrigger;
/// if signature_count = 0, signature help is closed
u16 signature_count;
Signature signatures[SIGNATURE_HELP_MAX];
};
void signature_help_init(Ted *ted) {
ted->signature_help = calloc(1, sizeof *ted->signature_help);
}
static void signature_help_clear(SignatureHelp *help) {
for (int i = 0; i < help->signature_count; ++i) {
Signature sig = help->signatures[i];
free(sig.label_pre);
free(sig.label_active);
free(sig.label_post);
}
memset(help->signatures, 0, sizeof help->signatures);
help->signature_count = 0;
}
static void signature_help_send_request(Ted *ted) {
SignatureHelp *help = ted->signature_help;
const Settings *settings = ted_active_settings(ted);
if (!settings->signature_help_enabled) {
signature_help_clear(help);
return;
}
TextBuffer *buffer = ted->active_buffer;
if (!buffer) {
signature_help_clear(help);
return;
}
LSP *lsp = buffer_lsp(buffer);
if (!lsp) {
signature_help_clear(help);
return;
}
LSPRequest request = {.type = LSP_REQUEST_SIGNATURE_HELP};
LSPRequestSignatureHelp *s = &request.data.signature_help;
s->position = buffer_cursor_pos_as_lsp_document_position(buffer);
ted_cancel_lsp_request(ted, &help->last_request);
help->last_request = lsp_send_request(lsp, &request);
help->retrigger = false;
}
void signature_help_retrigger(Ted *ted) {
// don't just send the request here -- we don't want to send more than
// one request per frame.
ted->signature_help->retrigger = true;
}
void signature_help_open(Ted *ted, uint32_t trigger) {
(void)trigger; // for now we don't send context
signature_help_send_request(ted);
}
bool signature_help_is_open(Ted *ted) {
return ted->signature_help->signature_count > 0;
}
void signature_help_close(Ted *ted) {
SignatureHelp *help = ted->signature_help;
signature_help_clear(help);
ted_cancel_lsp_request(ted, &help->last_request);
}
void signature_help_process_lsp_response(Ted *ted, const LSPResponse *response) {
SignatureHelp *help = ted->signature_help;
const Settings *settings = ted_active_settings(ted);
if (!settings->signature_help_enabled) return;
if (response->request.type != LSP_REQUEST_SIGNATURE_HELP)
return;
if (response->request.id != help->last_request.id) {
// stale request
return;
}
help->last_request.id = 0;
const LSPResponseSignatureHelp *lsp_help = &response->data.signature_help;
u32 signature_count = arr_len(lsp_help->signatures);
if (signature_count > SIGNATURE_HELP_MAX)
signature_count = SIGNATURE_HELP_MAX;
signature_help_clear(help);
for (u32 s = 0; s < signature_count; ++s) {
Signature *signature = &help->signatures[s];
LSPSignatureInformation *lsp_signature = &lsp_help->signatures[s];
const char *label = lsp_response_string(response, lsp_signature->label);
size_t start = unicode_utf16_to_utf8_offset(label, lsp_signature->active_start);
size_t end = unicode_utf16_to_utf8_offset(label, lsp_signature->active_end);
if (start == (size_t)-1) {
assert(0);
start = 0;
}
if (end == (size_t)-1) {
assert(0);
end = 0;
}
u32 active_start = (u32)start;
u32 active_end = (u32)end;
signature->label_pre = strn_dup(label, active_start);
signature->label_active = strn_dup(label + active_start, active_end - active_start);
signature->label_post = str_dup(label + active_end);
}
help->signature_count = (u16)signature_count;
}
void signature_help_frame(Ted *ted) {
const Settings *settings = ted_active_settings(ted);
if (!settings->signature_help_enabled)
return;
SignatureHelp *help = ted->signature_help;
if (help->retrigger)
signature_help_send_request(ted);
u16 signature_count = help->signature_count;
if (!signature_count)
return;
Font *font = ted->font;
Font *font_bold = ted->font_bold;
TextBuffer *buffer = ted->active_buffer;
if (!buffer)
return;
float border = settings->border_thickness;
Rect buf_rect = buffer_rect(buffer);
float width = buf_rect.size.x;
float height = FLT_MAX;
const float char_height = text_font_char_height(font);
// make sure signature help doesn't take up too much space
while (1) {
height = char_height * signature_count;
if (height < buffer_rect(buffer).size.y * 0.25f)
break;
--signature_count;
if (signature_count == 0) return;
}
float x = buf_rect.pos.x, y = rect_y2(buf_rect) - height;
gl_geometry_rect(rect_xywh(x, y - border, width, border),
settings_color(settings, COLOR_AUTOCOMPLETE_BORDER));
gl_geometry_rect(rect_xywh(x, y, width, height),
settings_color(settings, COLOR_AUTOCOMPLETE_BG));
// draw the signatures
for (int s = 0; s < signature_count; ++s) {
const Signature *signature = &help->signatures[s];
TextRenderState state = text_render_state_default;
state.x = x;
state.y = y;
state.min_x = x;
state.min_y = y;
state.max_x = rect_x2(buf_rect);
state.max_y = rect_y2(buf_rect);
settings_color_floats(settings, COLOR_TEXT, state.color);
text_utf8_with_state(font, &state, signature->label_pre);
text_utf8_with_state(font_bold, &state, signature->label_active);
text_utf8_with_state(font, &state, signature->label_post);
y += char_height;
}
gl_geometry_draw();
text_render(font);
text_render(font_bold);
}
void signature_help_quit(Ted *ted) {
signature_help_close(ted);
free(ted->signature_help);
ted->signature_help = NULL;
}
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