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#include <assert.h>
#include <ctype.h>
#include <log.h>
#include <stdbool.h>
#include <stdio.h>
#include <tokenize.h>
static char next_non_alnum(struct ctx *ctx, size_t start)
{
for (size_t i = start; i < ctx->size; i++)
if (!isalnum(ctx->data[i]))
return ctx->data[i];
errln(ctx, "Unexpected end of buffer");
}
static bool peek_to_is_alnum(struct ctx *ctx, size_t start, char ch)
{
for (size_t i = start; i < ctx->size; i++) {
char cur = ctx->data[i];
if (cur == ch || cur == ';' || cur == ')')
return true;
if (!isalnum(cur))
return false;
}
errln(ctx, "Unexpected end of buffer");
}
static size_t peek_alnum_to(struct ctx *ctx, size_t start, char ch)
{
for (size_t i = start; i < ctx->size; i++) {
char cur = ctx->data[i];
if (cur == ch || cur == ';' || cur == ')')
return i;
if (!isalnum(cur))
errln(ctx, "'%c' is not alpha-numeric", cur);
}
errln(ctx, "Unexpected end of buffer");
}
static size_t peek_special_to(struct ctx *ctx, size_t start, char ch)
{
for (size_t i = start; i < ctx->size; i++) {
char cur = ctx->data[i];
if (cur == ch || cur == ';' || cur == ')')
return i;
if (isalnum(cur) || cur < '!' || cur > '~')
errln(ctx, "'%c' is not special", cur);
}
errln(ctx, "Unexpected end of buffer");
}
static size_t peek_to(struct ctx *ctx, size_t start, char ch)
{
for (size_t i = start; i < ctx->size; i++) {
char cur = ctx->data[i];
if (cur == ch || cur == ';' || cur == ')')
return i;
}
errln(ctx, "Unexpected end of buffer");
}
static void token_add(struct ctx *ctx, enum token_type type, size_t start, size_t end)
{
struct token token = { 0 };
token.type = type;
token.start = start;
token.end = end;
assert(++ctx->token_count < TOKENS_MAX);
ctx->tokens[ctx->token_count] = token;
if (type == NEWLINE) {
ctx->line++;
ctx->column = 0;
} else {
ctx->column += end - start;
}
}
static void token_print(struct ctx *ctx, struct token *token)
{
assert(token->type != UNKNOWN);
printf("[token type=%d] '", token->type);
if (token->type == NEWLINE || token->type == END) {
printf("' (Unprintable)\n");
return;
}
for (size_t i = token->start; i < token->end; i++)
printf("%c", ctx->data[i]);
printf("'\n");
}
void tokens_print(struct ctx *ctx)
{
for (size_t i = 1; i < ctx->token_count; i++)
token_print(ctx, &ctx->tokens[i]);
}
void tokenize(struct ctx *ctx)
{
for (size_t i = 0; i < ctx->size; i++) {
const char cur = ctx->data[i];
switch (cur) {
case '\0':
token_add(ctx, END, i, i + 1);
return;
case '\n':
token_add(ctx, NEWLINE, i, i + 1);
continue;
case ';':
token_add(ctx, EOL, i, i + 1);
continue;
case '(':
token_add(ctx, LPAREN, i, i + 1);
continue;
case ')':
token_add(ctx, RPAREN, i, i + 1);
continue;
case '=':
token_add(ctx, EQUAL, i, i + 1);
continue;
case ' ':
ctx->column++;
continue;
default:
break;
}
if (next_non_alnum(ctx, i) == ':') { // Type with param identifier
size_t start_param = peek_alnum_to(ctx, i, ':') + 1;
size_t end_param;
if (peek_to_is_alnum(ctx, start_param, ' ')) {
end_param = peek_alnum_to(ctx, start_param, ' ');
} else { // Unnamed identifier ('_')
end_param = peek_to(ctx, start_param, ' ');
if (end_param - start_param != 1 || ctx->data[start_param] != '_')
errln(ctx, "Invalid param identifier");
}
token_add(ctx, TYPE, i, start_param - 1);
token_add(ctx, TYPEDELIM, start_param - 1, start_param);
token_add(ctx, PARAM, start_param, end_param);
i = end_param - 1;
continue;
}
if (peek_to_is_alnum(ctx, i, ' ')) { // General identifier
size_t end_ident = peek_alnum_to(ctx, i, ' ');
token_add(ctx, IDENT, i, end_ident);
i = end_ident - 1;
} else { // Special/custom operator
size_t end_operator = peek_special_to(ctx, i, ' ');
token_add(ctx, OPERATOR, i, end_operator);
i = end_operator - 1;
}
}
context_rewind(ctx);
}
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