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#include <errno.h>
#include <stdbool.h>
#include "cescal/lexer.h"
#include "cescal/log.h"
/*
* Returns true if the given character is a whitespace
*
* @c: Character to check
*/
static inline bool
lexer_is_ws(char c)
{
switch (c) {
case '\t':
case '\n':
case ' ':
case '\f':
case '\r':
return true;
}
return false;
}
/*
* Consume a single character from the input source file and
* optionally skip whitespace
*
* @state: Compiler state
* @skip_ws: If true skip whitespace
*/
static char
lexer_consume_single(struct cescal_state *state, bool skip_ws)
{
char c;
if (state == NULL) {
return '\0';
}
while ((c = readbuf_read(&state->rb, state->in_fd)) != '\0') {
if (lexer_is_ws(c)) {
continue;
}
return c;
}
return '\0';
}
int
lexer_nom(struct cescal_state *state, struct token *res)
{
char c;
if (state == NULL || res == NULL) {
errno = EINVAL;
return -1;
}
if ((c = lexer_consume_single(state, true)) == '\0') {
return -1;
}
switch (c) {
case '(':
res->type = TT_LPAREN;
res->c = c;
return 0;
case ')':
res->type = TT_RPAREN;
res->c = c;
return 0;
case ',':
res->type = TT_COMMA;
res->c = c;
return 0;
}
cc_error("got unknown token '%c'\n", c);
return -1;
}
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