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|
import "all.hff";
///////////
// Lexer //
///////////
fn chr(P *Parser) int {
let c int #?;
switch P.peekchr {
case Some pc;
c = pc;
P.peekchr = :None;
case None;
c = fgetc(P.fp);
}
++P.curloc.idx;
++P.curloc.col;
if c == '\n' {
P.curloc.col = 1;
++P.curloc.line;
}
if c == EOF {
P.eof = #t;
}
return c;
}
fn chrpeek(P *Parser) int {
switch P.peekchr {
case Some c; return c;
}
let c = fgetc(P.fp);
P.peekchr = :Some c;
return c;
}
fn chrmatch(P *Parser, c int) bool {
if chrpeek(P) == c {
chr(P);
return #t;
}
return #f;
}
fn isspace(c u8) bool {
switch c {
case ' ', '\t', '\n', '\r', '\v', '\f';
return #t;
}
return #f;
}
fn isdigit(c u8) bool {
return c >= '0' and c <= '9';
}
fn isxdigit(c u8) bool {
return isdigit(c)
or (c >= 'A' and c <= 'F')
or (c >= 'a' and c <= 'f');
}
fn isalpha(c u8) bool {
return (c >= 'a' and c <= 'z')
or (c >= 'A' and c <= 'z');
}
fn issep(c u8) bool {
if isspace(c) {
return #t;
}
switch (c) {
case '(', ')', '[', ']', '{', '}', '.', ',',
';', '?', '+', '-', '*', '/', '&', '|',
'^', '~', '=', '\'', '"', '<', '>', ':',
'@', '#', '\\', '`';
return #t;
}
return #f;
}
fn readtilsep(P *Parser, buf [#]u8, dot bool) int {
let i = 0,
c u8 #?;
while (not issep(c = chrpeek(P))) or (dot and c == '.') {
chr(P);
if i >= buf.#len - 1 {
return -1;
}
buf[i++] = c;
}
buf[i++] = 0;
return i;
}
fn eatspaces(P *Parser) void {
for ;;chr(P) {
if not isspace(chrpeek(P)) {
break;
}
}
}
// !sorted
static keyword2str []*const u8 = {
"and", "as", "break", "case", "const",
"continue", "def", "defmacro", "do",
"else", "enum", "extern", "fn",
"for", "if", "import", "let", "not",
"or", "return", "sizeof", "static",
"struct", "switch", "typedef", "typeof",
"union", "while",
};
fn str2keyword(s *const u8) int {
let i = 0, j = keyword2str.#len - 1;
while i <= j {
let k = (j + i) / 2;
let cmp = strcmp(keyword2str[k], s);
if cmp == 0 {
return k;
} else if cmp < 0 {
i = k + 1;
} else {
j = k - 1;
}
}
return -1;
}
fn readnumber(s *const u8) Option<Tok> {
let c u8 #?,
acc = 0u64,
accf = 0.0f64,
fmul = 0.1,
base = 10,
flt = #f,
nused = 0,
suffix *const u8 = #null;
for let i = 0; (c = s[i]) != 0; ++i {
if i == 0 and c == '0' {
--nused;
}
if i == 1 and tolower(c) == 'x' {
base = 16;
continue;
}
if not flt and c == '.' and base == 10 {
flt = #t;
accf = acc;
continue;
}
if nused > 0 and c == '_' { continue; }
if (base == 16 and not isdigit(c))
or (base != 16 and (c < '0' or c > ('0' + base) - 1)) {
suffix = s + i;
}
++nused;
if flt {
accf = accf + ((c - '0') * fmul);
fmul *= 0.1;
} else {
c = tolower(c);
acc = (acc * base) + (c <= '9' ? c - '0' : (c - 'a') + 10);
}
}
let tok = Tok {};
if flt {
tok.t = :flo;
tok.u.flo = accf;
return :Some tok;
} else {
tok.t = :int;
tok.u.uint = acc;
return :Some tok;
}
return :None;
}
fn lex(P *Parser) Tok {
let c int #?;
let tok Tok = {};
switch P.peektok {
case Some pt;
P.peektok = :None;
return pt;
}
eatspaces(P);
tok.loc = (P.tokloc = P.curloc);
if isdigit(c = chrpeek(P)) {
let s [80]u8 = {};
if readtilsep(P, s[0::], #t) < 0 {
// fatal
}
switch readnumber(s) {
case None;
fatal(P, tok.loc, "bad number literal %qs", s);
case Some tok;
tok.loc = P.tokloc;
return tok;
}
}
if c == EOF {
tok.t = :eof;
return tok;
}
fatal(P, tok.loc, "stray %qc in program", c);
}
extern fn parse(P *Parser) [#]Decl {
let tok = lex(P);
}
extern fn parser_init(P *Parser, path *const u8) void {
assert(NUM_KEYWORDS - 1 < '!', "2manykw");
*P = {};
P.curfile = path;
if (P.fp = fopen(path, "r")) == #null {
perror(path);
exit(1);
}
P.tokloc = (P.curloc = { addfilepath(path), 0, 1, 1 });
P.peekchr = :None;
}
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