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#include "ecex.h"
#include <string.h>
#define C_MODE_PLUGIN_ID "c-mode"
#define C_MODE_LSP_PROVIDER_NAME "c-mode-clangd"
#define C_MODE_SLOT_CLANGD "clangd"
static int c_mode_line_starts_with(buffer_t *buffer, size_t first, size_t line_end, const char *word) {
size_t len = strlen(word);
if (!buffer || !word || first + len > line_end) return 0;
if (strncmp(buffer->data + first, word, len) != 0) return 0;
if (first + len == line_end) return 1;
char c = buffer->data[first + len];
return !(c == '_' ||
(c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') ||
(c >= '0' && c <= '9'));
}
static int c_mode_line_ends_with_colon(buffer_t *buffer, size_t first, size_t line_end) {
if (!buffer || first >= line_end) return 0;
size_t p = line_end;
while (p > first && (buffer->data[p - 1] == ' ' || buffer->data[p - 1] == '\t')) p--;
return p > first && buffer->data[p - 1] == ':';
}
static size_t c_mode_previous_nonblank_line(buffer_t *buffer, size_t line_start) {
if (!buffer || line_start == 0) return (size_t)-1;
size_t end = line_start - 1;
while (end > 0 && buffer->data[end - 1] == '\n') end--;
for (;;) {
size_t start = buffer_line_start_at(buffer, end);
size_t line_end = buffer_line_end_at(buffer, start);
size_t p = start;
while (p < line_end && (buffer->data[p] == ' ' || buffer->data[p] == '\t')) p++;
if (p < line_end) return start;
if (start == 0) break;
end = start - 1;
}
return (size_t)-1;
}
static int c_mode_brace_depth_before(buffer_t *buffer, size_t limit) {
int depth = 0;
int in_block = 0;
int in_line = 0;
int in_string = 0;
int in_char = 0;
int escaped = 0;
if (!buffer || !buffer->data) return 0;
if (limit > buffer->len) limit = buffer->len;
for (size_t i = 0; i < limit; i++) {
char c = buffer->data[i];
char next = i + 1 < limit ? buffer->data[i + 1] : '\0';
if (in_line) {
if (c == '\n') in_line = 0;
continue;
}
if (in_block) {
if (c == '*' && next == '/') {
in_block = 0;
i++;
}
continue;
}
if (in_string) {
if (escaped) escaped = 0;
else if (c == '\\') escaped = 1;
else if (c == '"') in_string = 0;
else if (c == '\n') in_string = 0;
continue;
}
if (in_char) {
if (escaped) escaped = 0;
else if (c == '\\') escaped = 1;
else if (c == '\'') in_char = 0;
else if (c == '\n') in_char = 0;
continue;
}
if (c == '/' && next == '/') {
in_line = 1;
i++;
} else if (c == '/' && next == '*') {
in_block = 1;
i++;
} else if (c == '"') {
in_string = 1;
} else if (c == '\'') {
in_char = 1;
} else if (c == '{') {
depth++;
} else if (c == '}') {
if (depth > 0) depth--;
}
}
return depth;
}
static int cmd_c_indent_line(ecex_t *ed) {
if (!ed) return -1;
buffer_t *buffer = ecex_current_buffer(ed);
if (!buffer || buffer->read_only || buffer_is_interactive(buffer)) return -1;
size_t line_start = buffer_current_line_start(buffer);
size_t line_end = buffer_current_line_end(buffer);
size_t first = line_start;
while (first < line_end && (buffer->data[first] == ' ' || buffer->data[first] == '\t')) first++;
if (first < line_end && buffer->data[first] == '#') return ecex_indent_line_to(buffer, 0);
int depth = c_mode_brace_depth_before(buffer, line_start);
int target = depth * 4;
if (first < line_end && buffer->data[first] == '}') target -= 4;
size_t prev = c_mode_previous_nonblank_line(buffer, line_start);
if (prev != (size_t)-1) {
size_t prev_end = buffer_line_end_at(buffer, prev);
size_t prev_first = prev;
while (prev_first < prev_end && (buffer->data[prev_first] == ' ' || buffer->data[prev_first] == '\t')) prev_first++;
if ((c_mode_line_starts_with(buffer, prev_first, prev_end, "case") ||
c_mode_line_starts_with(buffer, prev_first, prev_end, "default")) &&
c_mode_line_ends_with_colon(buffer, prev_first, prev_end) &&
!(c_mode_line_starts_with(buffer, first, line_end, "case") ||
c_mode_line_starts_with(buffer, first, line_end, "default") ||
(first < line_end && buffer->data[first] == '}'))) {
target += 4;
}
}
if (target < 0) target = 0;
return ecex_indent_line_to(buffer, target);
}
static int cmd_c_complete(ecex_t *ed) {
return ecex_complete_at_point(ed);
}
static int c_mode_file_handler(ecex_t *ed, buffer_t *buffer) {
if (!ed || !buffer) return -1;
return ecex_buffer_set_major_mode_by_name(ed, buffer, "c-mode");
}
ECEX_PLUGIN_BEGIN(ecex_c_mode_plugin, C_MODE_PLUGIN_ID)
if (!ecex_define_major_mode(ed, "c-mode")) return -1;
ECEX_CONFIG_COMMAND("c-indent-line", cmd_c_indent_line);
ECEX_CONFIG_COMMAND("c-complete", cmd_c_complete);
ECEX_CONFIG_TRY(ecex_bind_mode_key(ed, "c-mode", "TAB", "c-indent-line"));
ECEX_CONFIG_TRY(ecex_bind_mode_key(ed, "c-mode", "C-TAB", "c-complete"));
ECEX_CONFIG_TRY(ecex_bind_mode_key(ed, "c-mode", "C-S-TAB", "complete-at-point-previous"));
if (ecex_dependency_available("clangd")) {
ECEX_CONFIG_TRY(ecex_add_clangd_completion_provider(ed,
C_MODE_LSP_PROVIDER_NAME,
"c-mode"));
ecex_plugin_slot_i32_set_scalar(plugin, C_MODE_SLOT_CLANGD, 1);
} else {
ecex_plugin_slot_i32_set_scalar(plugin, C_MODE_SLOT_CLANGD, 0);
ecex_message(ed, "c-mode: clangd not found; C completion disabled");
}
ECEX_CONFIG_TRY(ecex_plugin_file_handler_register(plugin, ".c", c_mode_file_handler));
ECEX_CONFIG_TRY(ecex_plugin_file_handler_register(plugin, ".h", c_mode_file_handler));
ECEX_CONFIG_TRY(ecex_plugin_file_handler_register(plugin, ".cc", c_mode_file_handler));
ECEX_CONFIG_TRY(ecex_plugin_file_handler_register(plugin, ".cpp", c_mode_file_handler));
ECEX_CONFIG_TRY(ecex_plugin_file_handler_register(plugin, ".cxx", c_mode_file_handler));
ECEX_CONFIG_TRY(ecex_plugin_file_handler_register(plugin, ".hh", c_mode_file_handler));
ECEX_CONFIG_TRY(ecex_plugin_file_handler_register(plugin, ".hpp", c_mode_file_handler));
ECEX_CONFIG_TRY(ecex_plugin_file_handler_register(plugin, ".hxx", c_mode_file_handler));
return 0;
ECEX_PLUGIN_END
#ifndef ECEX_NO_STANDALONE_CONFIG
ECEX_CONFIG_BEGIN
ECEX_CONFIG_INCLUDE(ecex_c_mode_plugin);
ECEX_CONFIG_END
#endif
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