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parse.x
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parse.x
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#define false 0
#define true 1
char *
read_file(char *path) ~ [ .alloc result; ];
struct lexer;
int
beginsdefs(char *s);
int
isboundary(char *s);
struct stringresult {
char *s;
char *pos;
};
struct stringresult
parse_defsraw(char *input) ~ [
result.s = $;
if (beginsdefs(input)) {
.alloc result.s;
}
result.pos = $;
];
/* skipws: skip whitespace */
char *
skipws(char *s);
struct lexer *
parse(char *pos) ~ [
char *pre; char *post;
struct pattern *pattern;
struct token *token;
pre = $; post = $; pattern = $; token = $; /* TODO: put in else */
if (beginsdefs(skipws(pos))) {
.alloc pre;
}
if (count_patterns(skipoptions(parse_defsraw(skipws(pos)).pos))) {
.alloc pattern;
}
if (count_tokens(skipws(parse_defs(pos).pos+2))) {
.alloc token;
}
if (isboundary(parse_rules(skipws(parse_defs(pos).pos+2)).pos)) {
.alloc post;
}
result = lexer_create(pre, post, $, pattern, $, token);
];
void
lexer_destroy(struct lexer *) ~ [
pre: {
l = lexer_create(
$, $,
$, malloc(1),
$, malloc(1)
);
}
.dealloc l->pattern;
.dealloc l->token;
.dealloc l;
];
void
lexer_print(struct lexer *) ~ [
pre: {
l = lexer_create(
$, $,
$, malloc(1),
$, malloc(1)
);
}
];
int
main() ~ [
]{
char *file;
struct lexer *l;
file = read_file("tests/3-program/100-lex/gen.l");
l = parse(file);
lexer_print(l);
lexer_destroy(l);
free(file);
}
char *
read_file(char *path)
{
FILE *f;
char *str;
int fsize; /* XXX: should be long */
f = fopen(path, "rb");
fseek(f, 0, SEEK_END);
fsize = ftell(f);
fseek(f, 0, SEEK_SET); /* same as rewind(f); */
str = malloc(fsize + 1);
fread(str, fsize, 1, f);
fclose(f);
str[fsize] = '\0';
return str;
}
struct pattern {
char *name; char *pattern;
};
void
pattern_print(struct pattern *p) ~ [
pre: p = pattern_create("", "");
];
struct token {
int isliteral;
char *name; char *action;
};
void
token_print(struct token *t) ~ [
pre: t = token_create(0, "", "");
];
struct lexer {
char *pre; char *post;
int npat; struct pattern *pattern;
int ntok; struct token *token;
};
struct lexer *
lexer_create(char *pre, char *post, int npat, struct pattern *pattern,
int ntok, struct token *token) ~ [
.alloc result;
result->pre = pre;
result->post = post;
result->pattern = pattern;
result->token = token;
]{
struct lexer *l;
l = malloc(sizeof(struct lexer));
l->pre = pre;
l->post = post;
l->pattern = pattern;
l->npat = npat;
l->token = token;
l->ntok = ntok;
return l;
}
void
lexer_destroy(struct lexer *l)
{
free(l->pattern);
free(l->token);
free(l);
}
void
lexer_print(struct lexer *l)
{
int i;
puts("\tpre:");
puts(l->pre);
puts("\tpost:");
puts(l->post);
puts("\tpatterns:");
for (i = 0; i < l->npat; i++) {
putchar('\t');
putchar('\t');
pattern_print(&l->pattern[i]);
putchar('\n');
}
puts("\ttokens:");
for (i = 0; i < l->ntok; i++) {
putchar('\t');
putchar('\t');
token_print(&l->token[i]);
putchar('\n');
}
}
struct defsresult {
char *pre;
struct pattern *pattern;
int npat;
char *pos;
};
char *
skipoptions(char *pos);
int
count_patterns(char *pos);
struct defsresult
parse_defs(char *pos) ~ [
result.pre = $;
result.pattern = $;
if (beginsdefs(skipws(pos))) {
.alloc result.pre;
}
if (count_patterns(skipoptions(parse_defsraw(skipws(pos)).pos))) {
.alloc result.pattern;
}
result.pos = $;
result.npat = $;
];
int
beginsdefs(char *s)
{
return strncmp(s, "%{", 2) == 0;
}
struct rulesresult {
struct token *token;
int ntok;
char *pos;
};
int
count_tokens(char *pos);
struct rulesresult
parse_rules(char *pos) ~ [
result.token = $; /* TODO: put in else block */
if (count_tokens(pos)) {
.alloc result.token;
}
result.pos = $;
result.ntok = $;
];
char *
parse_toeof(char *input) ~ [ if (isboundary(input)) .alloc result; ];
struct lexer *
parse(char *pos)
{
struct defsresult defs;
struct rulesresult rules;
char *post;
defs = parse_defs(pos);
pos = defs.pos;
if (!isboundary(pos)) {
puts("invalid transition to rules");
exit(1);
}
pos = skipws(pos + 2); /* %% */
rules = parse_rules(pos);
pos = rules.pos;
post = parse_toeof(pos);
return lexer_create(defs.pre, post, defs.npat, defs.pattern, rules.ntok,
rules.token);
}
int
isboundary(char *s)
{
return strncmp(s, "%%", 2) == 0;
}
char *
substr(char *s, int n) ~ [ .alloc result; ]
{
int len;
char *ss;
len = n + 1;
ss = malloc(sizeof(char) * len);
strncpy(ss, s, len);
ss[len-1] = '\0';
return ss;
}
char *
skipws(char *s)
{
for (; isspace(*s); s++) {}
return s;
}
char *
skiplinespace(char *s)
{
for (; *s == ' ' || *s == '\t'; s++) {}
return s;
}
char *
parse_id(char *input) ~ [ .alloc result; ];
char *
skipoptions(char *pos)
{
char *keyword;
char *id;
pos = skipws(pos);
keyword = "%option";
if (strncmp(pos, keyword, strlen(keyword)) != 0) {
return pos;
}
pos += strlen(keyword);
pos = skiplinespace(pos);
id = parse_id(pos);
pos += strlen(id);
free(id);
return skipws(pos);
}
char *
parse_id(char *input)
{
char *s;
if (!isalpha(*input)) {
/* TODO: print to stderr */
puts("id must begin with letter");
exit(1);
}
s = input + 1;
/* XXX: '0' is a placeholder to allow this to parse */
for (; isalpha(*s) || isdigit(*s) || *s == '_' ; 0) {
s++;
}
return substr(input, s - input);
}
char *
parse_tonewline(char *input) ~ [ .alloc result; ]
{
char *s;
s = input; /* must be here because not seen with skip loop hack */
for (; *s != '\n'; 0) {
s++;
}
return substr(input, s - input);
}
struct patternet {
struct pattern *pattern;
int npat;
char *pos;
};
struct patternet
parse_defsproper(char *input) ~ [
/* TODO: put in else block */
result.pattern = $;
if (count_patterns(input)) {
.alloc result.pattern;
}
result.npat = $;
result.pos = $;
];
struct defsresult
parse_defs(char *pos)
{
struct stringresult raw;
struct patternet set;
struct defsresult res;
pos = skipws(pos);
if (*pos == '\0') {
puts("EOF in defs");
exit(1);
}
raw = parse_defsraw(pos);
pos = raw.pos;
pos = skipoptions(pos);
set = parse_defsproper(pos);
res.pre = raw.s;
res.pattern = set.pattern;
res.npat = set.npat;
res.pos = set.pos;
return res;
}
struct stringresult
parse_defsraw(char *input)
{
char *pos;
struct stringresult res;
if (!beginsdefs(input)) {
res.s = "";
res.pos = input;
return res;
}
input += 2;
pos = input;
for (; strncmp(pos, "%}", 2) != 0; pos++) {}
res.s = substr(input, pos - input);
res.pos = pos + 2;
return res;
}
struct pattern *
pattern_create(char *name, char *pattern) ~ [
.alloc result;
result->name = name;
result->pattern = pattern;
]{
struct pattern *p;
p = malloc(sizeof(struct pattern));
p->name = name;
p->pattern = pattern;
return p;
}
void
pattern_print(struct pattern *p)
{
puts("pattern:");
puts(p->name);
puts(p->pattern);
puts("end pattern");
}
struct patternresult {
struct pattern *p;
char *pos;
};
struct patternpos {
struct pattern *p;
char *pos;
};
struct patternpos
parse_defs_n(char *pos, int npat) ~ [
result.p = $; /* TODO: put in else block */
if (npat) {
.alloc result.p;
}
result.pos = $;
];
struct patternet
parse_defsproper(char *input)
{
struct patternet res;
struct patternpos defs_n;
res.npat = count_patterns(input);
defs_n = parse_defs_n(input, res.npat);
res.pattern = defs_n.p;
res.pos = defs_n.pos;
return res;
}
struct patternresult
parse_pattern(char *pos) ~ [
result.p = pattern_create(malloc(1), malloc(1));
];
int
count_patterns(char *pos)
{
int n;
struct patternresult parsed;
n = 0;
for (; strncmp(pos, "%%", 2) != 0; n++) {
parsed = parse_pattern(pos);
pos = skipws(parsed.pos);
/* TODO: clean up r.p */
}
return n;
}
struct patternresult
parse_pattern(char *pos)
{
char *name; char *pattern;
struct patternresult res;
name = parse_id(pos);
pos = pos + strlen(name);
pos = skiplinespace(pos);
pattern = parse_tonewline(pos);
pos += strlen(pattern);
res.p = pattern_create(name, pattern);
res.pos = pos;
return res;
}
struct patternpos
parse_defs_n(char *pos, int npat)
{
int i;
struct pattern *p;
struct patternresult parsed;
struct patternpos res;
p = NULL;
if (npat) {
p = malloc(sizeof(struct pattern) * npat);
for (i = 0; i < npat; i++) {
parsed = parse_pattern(pos);
p[i] = *parsed.p;
pos = skipws(parsed.pos);
}
}
res.p = p;
res.pos = pos;
return res;
}
struct token *
token_create(int isliteral, char *name, char *action) ~ [
.alloc result;
result->isliteral = isliteral;
result->name = name;
result->action = action;
]{
struct token *tk;
tk = malloc(sizeof(struct token));
tk->isliteral = isliteral;
tk->name = name;
tk->action = action;
return tk;
}
void
token_print(struct token *t)
{
puts("token:");
puts(t->name);
puts(t->action);
puts("end token");
}
struct tokenpos {
struct token *t;
char *pos;
};
struct tokenpos
parse_rules_n(char *pos, int ntok) ~ [
result.t = $; /* TODO: put in else block */
if (ntok) {
.alloc result.t;
}
result.pos = $;
];
struct rulesresult
parse_rules(char *pos)
{
struct rulesresult res;
struct tokenpos rules_n;
res.ntok = count_tokens(pos);
rules_n = parse_rules_n(pos, res.ntok);
res.token = rules_n.t;
res.pos = rules_n.pos;
return res;
}
struct tokenresult {
struct token *tk;
char *pos;
};
struct tokenresult
parse_token(char *pos) ~ [
result.tk = token_create($, malloc($), malloc($));
result.pos = $;
];
int
count_tokens(char *pos)
{
int n;
struct tokenresult r;
n = 0;
for (; *pos != '\0' && strncmp(pos, "%%", 2) != 0 ; n++) {
r = parse_token(pos);
pos = skipws(r.pos);
/* TODO: clean up r.tk */
}
return n;
}
struct tokenpos
parse_rules_n(char *pos, int ntok)
{
int i;
struct token *t;
struct tokenresult parsed;
struct tokenpos res;
t = NULL;
if (ntok) {
t = malloc(sizeof(struct token) * ntok);
for (i = 0; i < ntok; i++) {
parsed = parse_token(pos);
t[i] = *parsed.tk;
pos = skipws(parsed.pos);
}
}
res.t = t;
res.pos = pos;
return res;
}
struct tknameresult {
int isliteral;
char *name;
char *pos;
};
struct tknameresult
parse_name(char *pos) ~ [
.alloc result.name;
result.isliteral = $;
result.pos = $;
];
struct stringresult
parse_action(char *input) ~ [
.alloc result.s;
result.pos = $;
];
struct tokenresult
parse_token(char *pos)
{
struct tknameresult nameres;
struct stringresult actionres;
struct tokenresult res;
nameres = parse_name(pos);
actionres = parse_action(skiplinespace(nameres.pos));
res.tk = token_create(nameres.isliteral, nameres.name, actionres.s);
res.pos = actionres.pos;
return res;
}
struct tknameresult
parse_token_id(char *pos) ~ [ .alloc result.name; ];
struct tknameresult
parse_token_literal(char *input) ~ [ .alloc result.name; ];
struct tknameresult
parse_token_pattern(char *pos) ~ [ .alloc result.name; ];
struct tknameresult
parse_name(char *pos)
{
/* TODO: make into switch */
if (*pos == '{') {
return parse_token_id(pos);
}
if (*pos == '"') {
return parse_token_literal(pos);
}
return parse_token_pattern(pos);
}
struct tknameresult
parse_token_id(char *pos)
{
char *id;
struct tknameresult res;
id = parse_id(++pos); /* skip '{' */
pos += strlen(id);
if (*pos != '}') {
puts("token id must end in '}'");
exit(1);
}
res.isliteral = false;
res.name = id;
res.pos = pos + 1; /* '}' */
return res;
}
struct tknameresult
parse_token_literal(char *input)
{
char *pos;
struct tknameresult res;
input++; /* skip '"' */
pos = input;
for (pos++; *pos != '"'; pos++) {}
res.isliteral = true;
res.name = substr(input, pos - input);
res.pos = pos + 1;
return res;
}
struct tknameresult
parse_token_pattern(char *pos)
{
char *id;
struct tknameresult res;
id = parse_id(pos);
res.isliteral = true;
res.name = id;
res.pos = pos + strlen(id);
return res;
}
struct stringresult
parse_action(char *input)
{
char *pos;
struct stringresult res;
if (*input != '{') {
puts("action must begin with '{'");
exit(1);
}
input++; /* skip '{' */
pos = input;
for (; *pos != '}'; pos++) {}
res.s = substr(input, pos - input);
res.pos = pos + 1;
return res;
}
char *
parse_toeof(char *input)
{
char *s;
if (!isboundary(input)) {
return "";
}
s = input; /* must be here because not seen with skip loop hack */
input += 2;
for (; *s != '\0'; 0) {
s++;
}
return substr(input, s - input);
}