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#include <string.h>
#include <ctype.h>
#include "lex.h"
const char *tok_to_desc[] = {
[TOKEN_REGISTER] = "register",
[TOKEN_NUMERIC] = "numeric literal",
[TOKEN_KEYWORD] = "keyword",
[TOKEN_STRING] = "string literal",
[TOKEN_COMMA] = "comma",
[TOKEN_LABEL] = "label",
[TOKEN_IDENT] = "identifier",
[TOKEN_DOT] = "assembler directive",
[TOKEN_EOL] = "end of line",
};
const char * get_token_description(enum TOKEN_TYPE t)
{
if (t < 0 || t >= sizeof(tok_to_desc)/sizeof(*tok_to_desc)) {
return "[internal error]";
} else {
return tok_to_desc[t];
}
}
void indicate_file_area(FILE* fd, size_t line, size_t column, size_t span)
{
size_t i = 0;
const char margin[] = " ";
char buf[1024] = { '\0' };
char *s = buf;
char c = '\0';
rewind(fd);
while (line && !feof(fd) && fgets(buf, sizeof(buf), fd)) {
s = buf;
while (*s) {
if (*(s++) == '\n') {
line--;
}
}
}
/* trim leading whitespace */
s = buf;
while (*s == '\t' || *s == ' ') {
s++;
}
/* filter non-printables to spaces to keep alignment correct */
for (i = 0; i < strlen(s); i++) {
if (!isprint(s[i]) && s[i] != '\n') {
s[i] = ' ';
}
}
fputs(margin, stderr);
fputs(s, stderr);
/* corner case (still needed?) - buf was just return */
if (strlen(buf) == 1 && buf[0] == '\n') {
fputc('\n', stderr);
}
fputs(margin, stderr);
column -= (s - buf);
for (column--; column; column--) {
fputc(' ', stderr);
}
c = span == 1 ? '^' : '"';
for (; span; span--) {
fputc(c, stderr);
}
fputc('\n', stderr);
}
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