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ant/src/highlight/iter.c
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iter.c
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#include <string.h>
#include <stdbool.h>
#include "tokens.h"
#include "highlight.h"
#include "highlight/regex.h"
#include "silver/lexer.h"
typedef struct {
const char *op;
int len;
hl_token_class cls;
} op_entry_t;
static const op_entry_t operators[] = {
{ "===", 3, HL_OPERATOR },
{ "!==", 3, HL_OPERATOR },
{ "...", 3, HL_OPERATOR },
{ "=>", 2, HL_OPERATOR },
{ "==", 2, HL_OPERATOR },
{ "!=", 2, HL_OPERATOR },
{ "<=", 2, HL_OPERATOR },
{ ">=", 2, HL_OPERATOR },
{ "&&", 2, HL_OPERATOR },
{ "||", 2, HL_OPERATOR },
{ "??", 2, HL_OPERATOR },
{ "?.", 2, HL_OPTIONAL_CHAIN },
};
#define OP_COUNT (sizeof(operators) / sizeof(operators[0]))
#define K(s, t) if (len == sizeof(s)-1 && !memcmp(word, s, sizeof(s)-1)) return t
static hl_token_class lookup_extra_keyword(const char *word, size_t len) {
switch (word[0]) {
case 'a':
K("abstract", HL_TYPE);
K("async", HL_KEYWORD_ITALIC);
break;
case 'b': K("boolean", HL_TYPE_BOOLEAN); break;
case 'd': K("declare", HL_TYPE); break;
case 'e':
K("enum", HL_TYPE);
K("export", HL_KEYWORD_ITALIC);
break;
case 'g': K("global", HL_KEYWORD_ITALIC); break;
case 'i':
K("interface", HL_TYPE);
K("implements", HL_TYPE);
break;
case 'n':
K("namespace", HL_TYPE);
K("never", HL_TYPE);
break;
case 'o': K("object", HL_TYPE); break;
case 'p':
K("package", HL_KEYWORD);
K("private", HL_KEYWORD);
K("protected", HL_KEYWORD);
K("public", HL_KEYWORD);
break;
case 'r': K("readonly", HL_TYPE); break;
case 's':
K("string", HL_TYPE_STRING);
K("symbol", HL_TYPE_STRING);
break;
case 't': K("type", HL_TYPE); break;
case 'u': K("unknown", HL_TYPE); break;
} return HL_NONE;
}
#undef K
static hl_token_class tok_to_class(uint8_t tok) {
static const void *dispatch[] = {
[TOK_ASYNC] = &&l_kw_italic,
[TOK_EXPORT] = &&l_kw_italic,
[TOK_THIS] = &&l_kw_italic,
[TOK_GLOBAL_THIS] = &&l_kw_italic,
[TOK_WINDOW] = &&l_kw_italic,
[TOK_DELETE] = &&l_kw_delete,
[TOK_TYPEOF] = &&l_type,
[TOK_INSTANCEOF] = &&l_type,
[TOK_OF] = &&l_type,
[TOK_IN] = &&l_type,
[TOK_AS] = &&l_type,
[TOK_TRUE] = &&l_bool,
[TOK_FALSE] = &&l_bool,
[TOK_NULL] = &&l_null,
[TOK_UNDEF] = &&l_null,
};
if (tok <= TOK_IDENTIFIER || tok >= TOK_IDENT_LIKE_END) return HL_NONE;
if (tok < sizeof(dispatch) / sizeof(*dispatch) && dispatch[tok]) goto *dispatch[tok];
return HL_KEYWORD;
l_kw_italic: return HL_KEYWORD_ITALIC;
l_kw_delete: return HL_KEYWORD_DELETE;
l_type: return HL_TYPE;
l_bool: return HL_BOOLEAN;
l_null: return HL_LITERAL_NULL;
}
void hl_iter_init(hl_iter *it, const char *input, size_t input_len, const highlight_state *state) {
it->input = input;
it->input_len = input_len;
it->pos = 0;
it->state = state ? *state : HL_STATE_INIT;
it->ctx = HL_CTX_NONE;
}
static hl_context keyword_sets_context(const char *word, size_t len) {
if (len == 8 && memcmp(word, "function", 8) == 0) return HL_CTX_AFTER_FUNCTION;
if (len == 5 && memcmp(word, "class", 5) == 0) return HL_CTX_AFTER_CLASS;
if (len == 7 && memcmp(word, "extends", 7) == 0) return HL_CTX_AFTER_EXTENDS;
return HL_CTX_NONE;
}
static size_t skip_inline_ws_forward(const char *input, size_t input_len, size_t i) {
while (i < input_len && (input[i] == ' ' || input[i] == '\t' || input[i] == '\n' || input[i] == '\r')) i++;
return i;
}
static size_t skip_inline_ws_backward(const char *input, size_t i) {
while (i > 0 && (input[i - 1] == ' ' || input[i - 1] == '\t' || input[i - 1] == '\n' || input[i - 1] == '\r')) i--;
return i;
}
static bool read_prev_word(const char *input, size_t end, size_t *word_start, size_t *word_len) {
size_t i = skip_inline_ws_backward(input, end);
if (i == 0 || !is_ident_continue((unsigned char)input[i - 1])) return false;
size_t wend = i;
while (i > 0 && is_ident_continue((unsigned char)input[i - 1])) i--;
*word_start = i;
*word_len = wend - i;
return true;
}
static bool is_arrow_after(const char *input, size_t input_len, size_t pos) {
size_t i = skip_inline_ws_forward(input, input_len, pos);
return (i + 1 < input_len && input[i] == '=' && input[i + 1] == '>');
}
static bool find_matching_close_paren(const char *input, size_t input_len, size_t open_paren, size_t *close_paren) {
size_t depth = 0;
for (size_t i = open_paren + 1; i < input_len; i++) {
unsigned char ch = (unsigned char)input[i];
if (ch == '(') {
depth++;
continue;
}
if (ch == ')') {
if (depth == 0) {
*close_paren = i;
return true;
}
depth--;
}
}
return false;
}
static bool has_declaration_keyword_before(const char *input, size_t ident_start) {
size_t ws, wstart, wlen;
ws = skip_inline_ws_backward(input, ident_start);
if (ws == 0) return false;
size_t wend = ws;
size_t i = ws;
while (i > 0 && is_ident_continue((unsigned char)input[i - 1])) i--;
wstart = i;
wlen = wend - i;
return
(wlen == 5 && memcmp(input + wstart, "const", 5) == 0) ||
(wlen == 3 && memcmp(input + wstart, "let", 3) == 0) ||
(wlen == 5 && memcmp(input + wstart, "using", 5) == 0) ||
(wlen == 3 && memcmp(input + wstart, "var", 3) == 0);
}
static bool is_assigned_arrow_function(const char *input, size_t input_len, size_t ident_start, size_t ident_end) {
if (!has_declaration_keyword_before(input, ident_start)) return false;
size_t i = skip_inline_ws_forward(input, input_len, ident_end);
if (i >= input_len || input[i] != '=') return false;
if (i + 1 < input_len && input[i + 1] == '>') return false;
i++; i = skip_inline_ws_forward(input, input_len, i);
if (i >= input_len) return false;
if (is_arrow_after(input, input_len, i)) return false;
if (is_ident_begin((unsigned char)input[i])) {
size_t j = i + 1;
while (j < input_len && is_ident_continue((unsigned char)input[j])) j++;
if (is_arrow_after(input, input_len, j)) return true;
}
if (input[i] == '(') {
size_t close = 0;
if (find_matching_close_paren(input, input_len, i, &close))
if (is_arrow_after(input, input_len, close + 1)) return true;
}
if (is_ident_begin((unsigned char)input[i]) || input[i] == '(') {
size_t j = i;
if (input[j] == '(') {
size_t close = 0;
if (find_matching_close_paren(input, input_len, j, &close)) j = close + 1;
else return false;
} else {
j++;
while (j < input_len && is_ident_continue((unsigned char)input[j])) j++;
}
j = skip_inline_ws_forward(input, input_len, j);
if (j < input_len && input[j] == ':') {
j++;
size_t depth = 0;
while (j < input_len) {
unsigned char ch = (unsigned char)input[j];
if (ch == '(' || ch == '<') { depth++; j++; continue; }
if (ch == ')' || ch == '>') {
if (depth > 0) depth--;
j++;
continue;
}
if (depth == 0 && (ch == '=' || ch == ',')) break;
j++;
}
if (is_arrow_after(input, input_len, j)) return true;
}
}
if (input[i] == 'a') {
if (i + 5 <= input_len && memcmp(input + i, "async", 5) == 0 &&
(i + 5 >= input_len || !is_ident_continue((unsigned char)input[i + 5]))) {
size_t j = skip_inline_ws_forward(input, input_len, i + 5);
if (j < input_len && input[j] == '(') {
size_t close = 0;
if (find_matching_close_paren(input, input_len, j, &close))
if (is_arrow_after(input, input_len, close + 1)) return true;
}
if (j < input_len && is_ident_begin((unsigned char)input[j])) {
size_t k = j + 1;
while (k < input_len && is_ident_continue((unsigned char)input[k])) k++;
if (is_arrow_after(input, input_len, k)) return true;
}
}
}
if (input[i] == 'f') {
if (i + 8 <= input_len && memcmp(input + i, "function", 8) == 0 &&
(i + 8 >= input_len || !is_ident_continue((unsigned char)input[i + 8])))
return true;
}
return false;
}
static bool has_function_keyword_before_paren(const char *input, size_t open_paren) {
size_t word_start = 0;
size_t word_len = 0;
if (!read_prev_word(input, open_paren, &word_start, &word_len)) return false;
if (word_len == 8 && memcmp(input + word_start, "function", 8) == 0) return true;
if (!read_prev_word(input, word_start, &word_start, &word_len)) return false;
return (word_len == 8 && memcmp(input + word_start, "function", 8) == 0);
}
static bool is_control_paren_prefix(const char *input, size_t open_paren) {
size_t word_start = 0;
size_t word_len = 0;
if (!read_prev_word(input, open_paren, &word_start, &word_len)) return false;
#define C(s) (word_len == sizeof(s) - 1 && memcmp(input + word_start, s, sizeof(s) - 1) == 0)
return C("if") || C("for") || C("while") || C("switch") || C("catch") || C("with");
#undef C
}
static bool is_likely_function_param_paren(
const char *input, size_t input_len,
size_t open_paren, size_t close_paren
) {
if (is_arrow_after(input, input_len, close_paren + 1)) return true;
if (has_function_keyword_before_paren(input, open_paren)) return true;
size_t after = skip_inline_ws_forward(input, input_len, close_paren + 1);
if (after < input_len && input[after] == '{' && !is_control_paren_prefix(input, open_paren))
return true;
return false;
}
static bool find_enclosing_open_paren(const char *input, size_t pos, size_t *open_paren) {
size_t depth = 0;
size_t i = pos;
while (i > 0) {
i--;
unsigned char ch = (unsigned char)input[i];
if (ch == ')') {
depth++;
continue;
}
if (ch == '(') {
if (depth == 0) {
*open_paren = i;
return true;
}
depth--;
}
}
return false;
}
static bool is_function_argument_identifier(const char *input, size_t input_len, size_t start, size_t end) {
if (is_arrow_after(input, input_len, end)) {
size_t left = skip_inline_ws_backward(input, start);
if (left > 0 && input[left - 1] == '.') return false;
return true;
}
size_t prev = skip_inline_ws_backward(input, start);
if (prev == 0) return false;
unsigned char prev_ch = (unsigned char)input[prev - 1];
if (!(prev_ch == '(' || prev_ch == ',' || prev_ch == '{' || prev_ch == '[' || prev_ch == ':'))
return false;
size_t open_paren = 0;
if (!find_enclosing_open_paren(input, start, &open_paren)) return false;
size_t close_paren = 0;
if (!find_matching_close_paren(input, input_len, open_paren, &close_paren)) return false;
return is_likely_function_param_paren(input, input_len, open_paren, close_paren);
}
static inline bool is_line_comment_terminator(unsigned char c) {
return c == '\n' || c == '\r';
}
bool hl_iter_next(hl_iter *it, hl_span *out) {
const char *input = it->input;
size_t input_len = it->input_len;
size_t i = it->pos;
if (i >= input_len) return false;
unsigned char c = (unsigned char)input[i];
if (it->state.mode == HL_STATE_BLOCK_COMMENT) {
size_t start = i;
while (i < input_len) {
if (input[i] == '*' && i + 1 < input_len && input[i + 1] == '/') {
i += 2;
it->state.mode = HL_STATE_NORMAL;
break;
}
i++;
}
*out = (hl_span){ start, i - start, HL_COMMENT };
it->pos = i;
return true;
}
if (i == 0 && c == '#' && i + 1 < input_len && input[i + 1] == '!') {
while (i < input_len && input[i] != '\n') i++;
*out = (hl_span){ 0, i, HL_COMMENT };
it->pos = i;
return true;
}
if (it->state.mode == HL_STATE_STRING_SINGLE || it->state.mode == HL_STATE_STRING_DOUBLE) {
char quote = (it->state.mode == HL_STATE_STRING_SINGLE) ? '\'' : '"';
size_t start = i;
while (i < input_len) {
if (input[i] == '\\' && i + 1 < input_len) { i += 2; continue; }
if (input[i] == quote) {
i++;
it->state.mode = (it->state.template_depth > 0) ? HL_STATE_TEMPLATE_EXPR : HL_STATE_NORMAL;
break;
}
i++;
}
*out = (hl_span){ start, i - start, HL_STRING };
it->pos = i;
return true;
}
if (it->state.mode == HL_STATE_TEMPLATE) {
size_t start = i;
while (i < input_len) {
if (input[i] == '\\' && i + 1 < input_len) { i += 2; continue; }
if (input[i] == '$' && i + 1 < input_len && input[i + 1] == '{') {
i += 2;
it->state.mode = HL_STATE_TEMPLATE_EXPR;
it->state.template_depth++;
break;
}
if (input[i] == '`') {
i++;
it->state.mode = (it->state.template_depth > 0) ? HL_STATE_TEMPLATE_EXPR : HL_STATE_NORMAL;
break;
}
i++;
}
*out = (hl_span){ start, i - start, HL_STRING };
it->pos = i;
return true;
}
if (it->state.mode == HL_STATE_TEMPLATE_EXPR && c == '}') {
it->state.template_depth--;
if (it->state.template_depth <= 0) {
it->state.mode = HL_STATE_TEMPLATE;
it->state.template_depth = 0;
*out = (hl_span){ i, 1, HL_BRACKET };
it->pos = i + 1;
return true;
}
}
if (it->state.mode == HL_STATE_TEMPLATE_EXPR && c == '{') {
it->state.template_depth++;
*out = (hl_span){ i, 1, HL_BRACKET };
it->pos = i + 1;
return true;
}
if (c == '/' && i + 1 < input_len && input[i + 1] == '/') {
it->ctx = HL_CTX_NONE;
size_t start = i; i += 2;
while (i < input_len && !is_line_comment_terminator((unsigned char)input[i])) i++;
*out = (hl_span){ start, i - start, HL_COMMENT };
it->pos = i;
return true;
}
if (c == '/' && i + 1 < input_len && input[i + 1] == '*') {
it->ctx = HL_CTX_NONE;
size_t start = i;
i += 2;
while (i + 1 < input_len && !(input[i] == '*' && input[i + 1] == '/')) i++;
if (i + 1 < input_len) {
i += 2;
} else {
i = input_len;
it->state.mode = HL_STATE_BLOCK_COMMENT;
}
*out = (hl_span){ start, i - start, HL_COMMENT };
it->pos = i;
return true;
}
if (c == '/') {
size_t regex_end = 0;
if (js_scan_regex_literal(input, input_len, i, &regex_end)) {
it->ctx = HL_CTX_NONE;
*out = (hl_span){ i, regex_end - i, HL_REGEX };
it->pos = regex_end;
return true;
}
}
if (c == '\'' || c == '"') {
it->ctx = HL_CTX_NONE;
size_t start = i;
it->state.mode = (c == '\'') ? HL_STATE_STRING_SINGLE : HL_STATE_STRING_DOUBLE;
i++;
while (i < input_len) {
if (input[i] == '\\' && i + 1 < input_len) { i += 2; continue; }
if ((unsigned char)input[i] == c) {
i++;
it->state.mode = (it->state.template_depth > 0) ? HL_STATE_TEMPLATE_EXPR : HL_STATE_NORMAL;
break;
}
i++;
}
*out = (hl_span){ start, i - start, HL_STRING };
it->pos = i;
return true;
}
if (c == '`') {
it->ctx = HL_CTX_NONE;
it->state.mode = HL_STATE_TEMPLATE;
*out = (hl_span){ i, 1, HL_STRING };
it->pos = i + 1;
return true;
}
if (c == ';') {
it->ctx = HL_CTX_NONE;
*out = (hl_span){ i, 1, HL_SEMICOLON };
it->pos = i + 1;
return true;
}
if (IS_DIGIT(c) || (c == '.' && i + 1 < input_len && IS_DIGIT(input[i + 1]))) {
it->ctx = HL_CTX_NONE;
size_t start = i;
if (c == '0' && i + 1 < input_len) {
unsigned char next = (unsigned char)input[i + 1];
if (next == 'x' || next == 'X') {
i += 2;
while (i < input_len && (IS_XDIGIT(input[i]) || input[i] == '_')) i++;
goto num_done;
} else if (next == 'b' || next == 'B') {
i += 2;
while (i < input_len && (input[i] == '0' || input[i] == '1' || input[i] == '_')) i++;
goto num_done;
} else if (next == 'o' || next == 'O') {
i += 2;
while (i < input_len && (IS_OCTAL(input[i]) || input[i] == '_')) i++;
goto num_done;
}
}
while (i < input_len && (IS_DIGIT(input[i]) || input[i] == '_')) i++;
if (i < input_len && input[i] == '.') {
i++;
while (i < input_len && (IS_DIGIT(input[i]) || input[i] == '_')) i++;
}
if (i < input_len && (input[i] == 'e' || input[i] == 'E')) {
i++;
if (i < input_len && (input[i] == '+' || input[i] == '-')) i++;
while (i < input_len && (IS_DIGIT(input[i]) || input[i] == '_')) i++;
}
num_done:
if (i < input_len && input[i] == 'n') i++;
*out = (hl_span){ start, i - start, HL_NUMBER };
it->pos = i;
return true;
}
for (int k = 0; k < (int)OP_COUNT; k++) {
int oplen = operators[k].len;
if (i + (size_t)oplen <= input_len &&
memcmp(input + i, operators[k].op, (size_t)oplen) == 0) {
it->ctx = HL_CTX_NONE;
*out = (hl_span){ i, (size_t)oplen, operators[k].cls };
it->pos = i + (size_t)oplen;
return true;
}
}
if (c == '#' && i + 1 < input_len && is_ident_begin((unsigned char)input[i + 1])) {
size_t start = i;
i += 2;
while (i < input_len && is_ident_continue((unsigned char)input[i])) i++;
it->ctx = HL_CTX_NONE;
*out = (hl_span){ start, i - start, HL_PROPERTY };
it->pos = i;
return true;
}
if (is_ident_begin(c)) {
size_t start = i;
i++;
while (i < input_len && is_ident_continue(input[i])) i++;
size_t word_len = i - start;
const char *word = input + start;
bool is_member_access = (start > 0 && input[start - 1] == '.' &&
(start < 2 || input[start - 2] != '.'));
bool is_method = false;
if (is_member_access) {
size_t peek = i;
while (peek < input_len && input[peek] == ' ') peek++;
if (peek < input_len && input[peek] == '(') is_method = true;
}
size_t after_word = i;
while (after_word < input_len && input[after_word] == ' ') after_word++;
bool is_call = (after_word < input_len && input[after_word] == '(');
hl_token_class cls = HL_NONE;
bool is_console = (word_len == 7 && memcmp(word, "console", 7) == 0);
if (is_console) {
cls = HL_PROPERTY;
} else if (is_function_argument_identifier(input, input_len, start, i)) {
cls = HL_ARGUMENT;
} else if (is_method) {
cls = HL_FUNCTION;
} else if (is_member_access) {
cls = HL_PROPERTY;
} else if (is_assigned_arrow_function(input, input_len, start, i)) {
cls = HL_FUNCTION_NAME;
} else if (it->ctx == HL_CTX_AFTER_FUNCTION) {
cls = HL_FUNCTION_NAME;
it->ctx = HL_CTX_NONE;
} else if (it->ctx == HL_CTX_AFTER_CLASS) {
cls = HL_CLASS_NAME;
it->ctx = HL_CTX_NONE;
} else if (it->ctx == HL_CTX_AFTER_EXTENDS) {
cls = HL_PARENT_CLASS;
it->ctx = HL_CTX_NONE;
} else {
cls = lookup_extra_keyword(word, word_len);
if (cls == HL_NONE) {
if ((word_len == 3 && memcmp(word, "NaN", 3) == 0) ||
(word_len == 8 && memcmp(word, "Infinity", 8) == 0)) {
cls = HL_NUMBER;
}
else if (word_len == 7 && memcmp(word, "extends", 7) == 0) {
cls = HL_KEYWORD_EXTENDS;
} else {
cls = tok_to_class(sv_parsekeyword(word, word_len));
}
}
if (cls == HL_NONE) {
size_t peek = i;
while (peek < input_len && input[peek] == ' ') peek++;
if (peek < input_len && input[peek] == ':' &&
(peek + 1 >= input_len || input[peek + 1] != ':'))
cls = HL_PROPERTY;
}
if (cls == HL_NONE && word[0] >= 'A' && word[0] <= 'Z') {
cls = HL_TYPE;
}
if (cls == HL_NONE && is_call) {
cls = HL_FUNCTION;
}
hl_context next_ctx = keyword_sets_context(word, word_len);
if (next_ctx != HL_CTX_NONE) it->ctx = next_ctx;
}
*out = (hl_span){ start, word_len, cls };
it->pos = i;
return true;
}
if (c == '<' || c == '>' || c == '=' ||
c == '+' || c == '-' || c == '*' || c == '/' ||
c == '%' || c == '&' || c == '|' || c == '^' ||
c == '~' || c == '!' || c == '?') {
it->ctx = HL_CTX_NONE;
*out = (hl_span){ i, 1, HL_OPERATOR };
it->pos = i + 1;
return true;
}
if (c == '(' || c == ')' || c == '[' || c == ']' || c == '{' || c == '}') {
it->ctx = HL_CTX_NONE;
*out = (hl_span){ i, 1, HL_BRACKET };
it->pos = i + 1;
return true;
}
if (c == ' ' || c == '\t') {
size_t start = i;
while (i < input_len && (input[i] == ' ' || input[i] == '\t')) i++;
*out = (hl_span){ start, i - start, HL_NONE };
it->pos = i;
return true;
}
it->ctx = HL_CTX_NONE;
*out = (hl_span){ i, 1, HL_NONE };
it->pos = i + 1;
return true;
}

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