mirror of https://gitee.com/bigwinds/arangodb
1248 lines
34 KiB
C
1248 lines
34 KiB
C
#include <stdlib.h> /* for exit */
|
|
#include <string.h> /* for strlen */
|
|
#include <stdio.h> /* for fprintf etc */
|
|
#include <ctype.h> /* for toupper */
|
|
#include "header.h"
|
|
|
|
/* prototypes */
|
|
|
|
static void generate(struct generator * g, struct node * p);
|
|
static void w(struct generator * g, const char * s);
|
|
static void writef(struct generator * g, const char * s, struct node * p);
|
|
|
|
|
|
enum special_labels {
|
|
x_return = -1
|
|
};
|
|
|
|
static int new_label(struct generator * g) {
|
|
|
|
return g->next_label++;
|
|
}
|
|
|
|
static struct str * vars_newname(struct generator * g) {
|
|
|
|
struct str * output;
|
|
g->var_number ++;
|
|
output = str_new();
|
|
str_append_string(output, "v_");
|
|
str_append_int(output, g->var_number);
|
|
return output;
|
|
}
|
|
|
|
|
|
/* Write routines for items from the syntax tree */
|
|
|
|
static void write_varname(struct generator * g, struct name * p) {
|
|
|
|
switch (p->type) {
|
|
case t_external:
|
|
write_char(g, toupper(p->b[0]));
|
|
const char *rest = b_to_s(p->b);
|
|
str_append_string(g->outbuf, rest+1);
|
|
return;
|
|
default: {
|
|
int ch = "SbirxG"[p->type];
|
|
write_char(g, ch);
|
|
write_char(g, '_');
|
|
break;
|
|
}
|
|
}
|
|
str_append_b(g->outbuf, p->b);
|
|
}
|
|
|
|
static void write_varref(struct generator * g, struct name * p) {
|
|
write_string(g, "context.");
|
|
write_varname(g, p);
|
|
}
|
|
|
|
static void write_hexdigit(struct generator * g, int n) {
|
|
|
|
write_char(g, n < 10 ? n + '0' : n - 10 + 'A');
|
|
}
|
|
|
|
static void write_hex(struct generator * g, int ch) {
|
|
|
|
write_string(g, "\\u");
|
|
{
|
|
int i;
|
|
for (i = 12; i >= 0; i -= 4) write_hexdigit(g, ch >> i & 0xf);
|
|
}
|
|
}
|
|
|
|
static void write_literal_string(struct generator * g, symbol * p) {
|
|
|
|
int i = 0;
|
|
write_string(g, "\"");
|
|
while (i < SIZE(p)) {
|
|
int ch;
|
|
i += get_utf8(p + i, &ch);
|
|
if (32 <= ch && ch < 127) {
|
|
if (ch == '\"' || ch == '\\') write_string(g, "\\");
|
|
write_char(g, ch);
|
|
} else {
|
|
write_hex(g, ch);
|
|
}
|
|
}
|
|
write_string(g, "\"");
|
|
}
|
|
|
|
|
|
static void write_margin(struct generator * g) {
|
|
|
|
int i;
|
|
for (i = 0; i < g->margin; i++) write_string(g, " ");
|
|
}
|
|
|
|
static void write_comment(struct generator * g, struct node * p) {
|
|
|
|
/* FIXME could use Go //line syntax if we had original filename */
|
|
write_margin(g);
|
|
write_string(g, "// ");
|
|
write_string(g, name_of_token(p->type));
|
|
if (p->name != 0) {
|
|
write_string(g, " ");
|
|
str_append_b(g->outbuf, p->name->b);
|
|
}
|
|
write_string(g, ", line ");
|
|
write_int(g, p->line_number);
|
|
write_newline(g);
|
|
}
|
|
|
|
static void write_block_start(struct generator * g) {
|
|
|
|
w(g, "~+{~N");
|
|
}
|
|
|
|
static void write_block_end(struct generator * g) /* block end */ {
|
|
|
|
w(g, "~-~M}~N");
|
|
}
|
|
|
|
static void write_savecursor(struct generator * g, struct node * p,
|
|
struct str * savevar) {
|
|
|
|
g->B[0] = str_data(savevar);
|
|
g->S[1] = "";
|
|
if (p->mode != m_forward) g->S[1] = "env.Limit - ";
|
|
writef(g, "~Mvar ~B0 = ~S1env.Cursor~N", p);
|
|
}
|
|
|
|
static void restore_string(struct node * p, struct str * out, struct str * savevar) {
|
|
|
|
str_clear(out);
|
|
str_append_string(out, "env.Cursor = ");
|
|
if (p->mode != m_forward) str_append_string(out, "env.Limit - ");
|
|
str_append(out, savevar);
|
|
}
|
|
|
|
static void write_restorecursor(struct generator * g, struct node * p,
|
|
struct str * savevar) {
|
|
|
|
struct str * temp = str_new();
|
|
write_margin(g);
|
|
restore_string(p, temp, savevar);
|
|
write_str(g, temp);
|
|
write_newline(g);
|
|
str_delete(temp);
|
|
}
|
|
|
|
static void write_inc_cursor(struct generator * g, struct node * p) {
|
|
|
|
write_margin(g);
|
|
write_string(g, p->mode == m_forward ? "env.NextChar();" : "env.PrevChar();");
|
|
write_newline(g);
|
|
}
|
|
|
|
static void wsetlab_begin(struct generator * g, int n) {
|
|
|
|
g->I[0] = n;
|
|
w(g, "~Mlab~I0: for {~N~+");
|
|
}
|
|
|
|
static void wsetlab_end(struct generator * g, int n) {
|
|
g->I[0] = n;
|
|
w(g, "~Mbreak lab~I0~N");
|
|
w(g, "~-~M}~N");
|
|
}
|
|
|
|
static void wgotol(struct generator * g, int n) {
|
|
g->I[0] = n;
|
|
w(g, "~Mbreak lab~I0~N");
|
|
}
|
|
|
|
static void write_failure(struct generator * g) {
|
|
|
|
if (str_len(g->failure_str) != 0) {
|
|
write_margin(g);
|
|
write_str(g, g->failure_str);
|
|
write_newline(g);
|
|
}
|
|
switch (g->failure_label)
|
|
{
|
|
case x_return:
|
|
w(g, "~Mreturn false~N");
|
|
g->unreachable = true;
|
|
break;
|
|
default:
|
|
g->I[0] = g->failure_label;
|
|
w(g, "~Mbreak lab~I0~N");
|
|
g->unreachable = true;
|
|
}
|
|
}
|
|
|
|
static void write_failure_if(struct generator * g, char * s, struct node * p) {
|
|
|
|
writef(g, "~Mif ", p);
|
|
writef(g, s, p);
|
|
writef(g, " ", p);
|
|
write_block_start(g);
|
|
write_failure(g);
|
|
write_block_end(g);
|
|
g->unreachable = false;
|
|
}
|
|
|
|
/* if at limit fail */
|
|
static void write_check_limit(struct generator * g, struct node * p) {
|
|
|
|
if (p->mode == m_forward) {
|
|
write_failure_if(g, "env.Cursor >= env.Limit", p);
|
|
} else {
|
|
write_failure_if(g, "env.Cursor <= env.LimitBackward", p);
|
|
}
|
|
}
|
|
|
|
/* Formatted write. */
|
|
static void writef(struct generator * g, const char * input, struct node * p) {
|
|
int i = 0;
|
|
int l = strlen(input);
|
|
|
|
while (i < l) {
|
|
int ch = input[i++];
|
|
if (ch != '~') {
|
|
write_char(g, ch);
|
|
continue;
|
|
}
|
|
switch (input[i++]) {
|
|
default: write_char(g, input[i - 1]); continue;
|
|
case 'C': write_comment(g, p); continue;
|
|
case 'f': write_block_start(g);
|
|
write_failure(g);
|
|
g->unreachable = false;
|
|
write_block_end(g);
|
|
continue;
|
|
case 'M': write_margin(g); continue;
|
|
case 'N': write_newline(g); continue;
|
|
case '{': write_block_start(g); continue;
|
|
case '}': write_block_end(g); continue;
|
|
case 'S': write_string(g, g->S[input[i++] - '0']); continue;
|
|
case 'B': write_b(g, g->B[input[i++] - '0']); continue;
|
|
case 'I': write_int(g, g->I[input[i++] - '0']); continue;
|
|
case 'V': write_varref(g, g->V[input[i++] - '0']); continue;
|
|
case 'W': write_varname(g, g->V[input[i++] - '0']); continue;
|
|
case 'L': write_literal_string(g, g->L[input[i++] - '0']); continue;
|
|
case '+': g->margin++; continue;
|
|
case '-': g->margin--; continue;
|
|
case 'n': write_string(g, g->options->name); continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void w(struct generator * g, const char * s) {
|
|
writef(g, s, 0);
|
|
}
|
|
|
|
static void generate_AE(struct generator * g, struct node * p) {
|
|
const char * s;
|
|
switch (p->type) {
|
|
case c_name:
|
|
write_varref(g, p->name); break;
|
|
case c_number:
|
|
write_int(g, p->number); break;
|
|
case c_maxint:
|
|
write_string(g, "snowballRuntime.MaxInt"); break;
|
|
case c_minint:
|
|
write_string(g, "snowballRuntime.MinInt"); break;
|
|
case c_neg:
|
|
write_char(g, '-'); generate_AE(g, p->right); break;
|
|
case c_multiply:
|
|
s = " * "; goto label0;
|
|
case c_plus:
|
|
s = " + "; goto label0;
|
|
case c_minus:
|
|
s = " - "; goto label0;
|
|
case c_divide:
|
|
s = " / ";
|
|
label0:
|
|
write_char(g, '('); generate_AE(g, p->left);
|
|
write_string(g, s); generate_AE(g, p->right); write_char(g, ')'); break;
|
|
case c_cursor:
|
|
w(g, "env.Cursor"); break;
|
|
case c_limit:
|
|
w(g, p->mode == m_forward ? "env.Limit" : "env.LimitBackward"); break;
|
|
case c_lenof:
|
|
g->V[0] = p->name;
|
|
w(g, "snowballRuntime.RuneCountInString(~V0)");
|
|
break;
|
|
case c_sizeof:
|
|
g->V[0] = p->name;
|
|
w(g, "len(~V0)");
|
|
break;
|
|
case c_len:
|
|
w(g, "snowballRuntime.RuneCountInString(env.Current())");
|
|
break;
|
|
case c_size:
|
|
w(g, "len(env.Current())");
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void generate_bra(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
p = p->left;
|
|
while (p) {
|
|
generate(g, p);
|
|
p = p->right;
|
|
}
|
|
}
|
|
|
|
static void generate_and(struct generator * g, struct node * p) {
|
|
|
|
struct str * savevar = vars_newname(g);
|
|
int keep_c = K_needed(g, p->left);
|
|
|
|
write_comment(g, p);
|
|
|
|
if (keep_c) write_savecursor(g, p, savevar);
|
|
|
|
p = p->left;
|
|
while (p) {
|
|
generate(g, p);
|
|
if (g->unreachable) break;
|
|
if (keep_c && p->right != 0) write_restorecursor(g, p, savevar);
|
|
p = p->right;
|
|
}
|
|
str_delete(savevar);
|
|
}
|
|
|
|
static void generate_or(struct generator * g, struct node * p) {
|
|
|
|
struct str * savevar = vars_newname(g);
|
|
int keep_c = K_needed(g, p->left);
|
|
|
|
int a0 = g->failure_label;
|
|
struct str * a1 = str_copy(g->failure_str);
|
|
|
|
int out_lab = new_label(g);
|
|
int end_unreachable = true;
|
|
|
|
write_comment(g, p);
|
|
wsetlab_begin(g, out_lab);
|
|
|
|
if (keep_c) write_savecursor(g, p, savevar);
|
|
|
|
p = p->left;
|
|
str_clear(g->failure_str);
|
|
|
|
if (p == 0) {
|
|
/* p should never be 0 after an or: there should be at least two
|
|
* sub nodes. */
|
|
fprintf(stderr, "Error: \"or\" node without children nodes.");
|
|
exit (1);
|
|
}
|
|
while (p->right != 0) {
|
|
g->failure_label = new_label(g);
|
|
int label = g->failure_label;
|
|
wsetlab_begin(g, label);
|
|
generate(g, p);
|
|
if (!g->unreachable) {
|
|
wgotol(g, out_lab);
|
|
end_unreachable = false;
|
|
}
|
|
w(g, "~-~M}~N");
|
|
g->unreachable = false;
|
|
if (keep_c) write_restorecursor(g, p, savevar);
|
|
p = p->right;
|
|
}
|
|
|
|
g->failure_label = a0;
|
|
str_delete(g->failure_str);
|
|
g->failure_str = a1;
|
|
|
|
generate(g, p);
|
|
wsetlab_end(g, out_lab);
|
|
g->unreachable = end_unreachable;
|
|
str_delete(savevar);
|
|
}
|
|
|
|
static void generate_backwards(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
writef(g,"~Menv.LimitBackward = env.Cursor~N"
|
|
"~Menv.Cursor = env.Limit~N", p);
|
|
generate(g, p->left);
|
|
w(g, "~Menv.Cursor = env.LimitBackward~N");
|
|
}
|
|
|
|
|
|
static void generate_not(struct generator * g, struct node * p) {
|
|
|
|
struct str * savevar = vars_newname(g);
|
|
int keep_c = K_needed(g, p->left);
|
|
|
|
int a0 = g->failure_label;
|
|
struct str * a1 = str_copy(g->failure_str);
|
|
|
|
write_comment(g, p);
|
|
if (keep_c) {
|
|
write_savecursor(g, p, savevar);
|
|
}
|
|
|
|
g->failure_label = new_label(g);
|
|
int label = g->failure_label;
|
|
str_clear(g->failure_str);
|
|
|
|
wsetlab_begin(g, label);
|
|
|
|
generate(g, p->left);
|
|
|
|
g->failure_label = a0;
|
|
str_delete(g->failure_str);
|
|
g->failure_str = a1;
|
|
|
|
if (!g->unreachable) write_failure(g);
|
|
w(g, "~-~M}~N");
|
|
|
|
g->unreachable = false;
|
|
|
|
if (keep_c) write_restorecursor(g, p, savevar);
|
|
str_delete(savevar);
|
|
}
|
|
|
|
|
|
static void generate_try(struct generator * g, struct node * p) {
|
|
|
|
struct str * savevar = vars_newname(g);
|
|
int keep_c = K_needed(g, p->left);
|
|
|
|
write_comment(g, p);
|
|
if (keep_c) write_savecursor(g, p, savevar);
|
|
|
|
g->failure_label = new_label(g);
|
|
int label = g->failure_label;
|
|
|
|
if (keep_c) restore_string(p, g->failure_str, savevar);
|
|
wsetlab_begin(g, label);
|
|
generate(g, p->left);
|
|
wsetlab_end(g, label);
|
|
g->unreachable = false;
|
|
|
|
str_delete(savevar);
|
|
}
|
|
|
|
static void generate_set(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
g->V[0] = p->name;
|
|
writef(g, "~M~V0 = true~N", p);
|
|
}
|
|
|
|
static void generate_unset(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
g->V[0] = p->name;
|
|
writef(g, "~M~V0 = false~N", p);
|
|
}
|
|
|
|
static void generate_fail(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
generate(g, p->left);
|
|
if (!g->unreachable) write_failure(g);
|
|
}
|
|
|
|
/* generate_test() also implements 'reverse' */
|
|
|
|
static void generate_test(struct generator * g, struct node * p) {
|
|
|
|
struct str * savevar = vars_newname(g);
|
|
int keep_c = K_needed(g, p->left);
|
|
|
|
write_comment(g, p);
|
|
|
|
if (keep_c) {
|
|
write_savecursor(g, p, savevar);
|
|
}
|
|
|
|
generate(g, p->left);
|
|
|
|
if (!g->unreachable) {
|
|
if (keep_c) {
|
|
write_restorecursor(g, p, savevar);
|
|
}
|
|
}
|
|
str_delete(savevar);
|
|
}
|
|
|
|
static void generate_do(struct generator * g, struct node * p) {
|
|
|
|
struct str * savevar = vars_newname(g);
|
|
int keep_c = K_needed(g, p->left);
|
|
write_comment(g, p);
|
|
if (keep_c) write_savecursor(g, p, savevar);
|
|
g->failure_label = new_label(g);
|
|
int label = g->failure_label;
|
|
str_clear(g->failure_str);
|
|
|
|
wsetlab_begin(g, label);
|
|
generate(g, p->left);
|
|
wsetlab_end(g, label);
|
|
g->unreachable = false;
|
|
|
|
if (keep_c) write_restorecursor(g, p, savevar);
|
|
str_delete(savevar);
|
|
}
|
|
|
|
static void generate_GO(struct generator * g, struct node * p, int style) {
|
|
|
|
int end_unreachable = false;
|
|
struct str * savevar = vars_newname(g);
|
|
int keep_c = style == 1 || repeat_restore(g, p->left);
|
|
|
|
int a0 = g->failure_label;
|
|
struct str * a1 = str_copy(g->failure_str);
|
|
|
|
int golab = new_label(g);
|
|
g->I[0] = golab;
|
|
write_comment(g, p);
|
|
w(g, "~Mgolab~I0: for {~N~+");
|
|
if (keep_c) write_savecursor(g, p, savevar);
|
|
|
|
g->failure_label = new_label(g);
|
|
wsetlab_begin(g, g->failure_label);
|
|
generate(g, p->left);
|
|
|
|
if (g->unreachable) {
|
|
/* Cannot break out of this loop: therefore the code after the
|
|
* end of the loop is unreachable.*/
|
|
end_unreachable = true;
|
|
} else {
|
|
/* include for goto; omit for gopast */
|
|
if (style == 1) write_restorecursor(g, p, savevar);
|
|
g->I[0] = golab;
|
|
w(g, "~Mbreak golab~I0~N");
|
|
}
|
|
g->unreachable = false;
|
|
w(g, "~-~M}~N");
|
|
if (keep_c) write_restorecursor(g, p, savevar);
|
|
|
|
g->failure_label = a0;
|
|
str_delete(g->failure_str);
|
|
g->failure_str = a1;
|
|
|
|
write_check_limit(g, p);
|
|
write_inc_cursor(g, p);
|
|
write_block_end(g);
|
|
|
|
str_delete(savevar);
|
|
g->unreachable = end_unreachable;
|
|
}
|
|
|
|
static void generate_loop(struct generator * g, struct node * p) {
|
|
|
|
struct str * loopvar = vars_newname(g);
|
|
write_comment(g, p);
|
|
w(g, "~Mfor _ = range make([]struct{},");
|
|
generate_AE(g, p->AE);
|
|
writef(g, ") {~+~N", p);
|
|
|
|
generate(g, p->left);
|
|
|
|
w(g, "~-~M}~N");
|
|
str_delete(loopvar);
|
|
g->unreachable = false;
|
|
}
|
|
|
|
static void generate_repeat(struct generator * g, struct node * p, struct str * loopvar) {
|
|
|
|
struct str * savevar = vars_newname(g);
|
|
int keep_c = repeat_restore(g, p->left);
|
|
int replab = new_label(g);
|
|
g->I[0] = replab;
|
|
write_comment(g, p);
|
|
writef(g, "~Mreplab~I0: for{~N~+", p);
|
|
|
|
if (keep_c) write_savecursor(g, p, savevar);
|
|
|
|
g->failure_label = new_label(g);
|
|
str_clear(g->failure_str);
|
|
g->I[0] = g->failure_label;
|
|
w(g, "~Mlab~I0: for _ = range [2]struct{}{} {~N~+");
|
|
generate(g, p->left);
|
|
|
|
if (!g->unreachable) {
|
|
if (loopvar != 0) {
|
|
g->B[0] = str_data(loopvar);
|
|
w(g, "~M~B0--~N");
|
|
}
|
|
|
|
g->I[0] = replab;
|
|
w(g, "~Mcontinue replab~I0~N");
|
|
}
|
|
w(g, "~-~M}~N");
|
|
g->unreachable = false;
|
|
|
|
if (keep_c) write_restorecursor(g, p, savevar);
|
|
|
|
g->I[0] = replab;
|
|
w(g, "~Mbreak replab~I0~N~-~M}~N");
|
|
str_delete(savevar);
|
|
}
|
|
|
|
static void generate_atleast(struct generator * g, struct node * p) {
|
|
|
|
struct str * loopvar = vars_newname(g);
|
|
write_comment(g, p);
|
|
g->B[0] = str_data(loopvar);
|
|
w(g, "~Mvar ~B0 = ");
|
|
generate_AE(g, p->AE);
|
|
w(g, "~N");
|
|
{
|
|
int a0 = g->failure_label;
|
|
struct str * a1 = str_copy(g->failure_str);
|
|
|
|
generate_repeat(g, p, loopvar);
|
|
|
|
g->failure_label = a0;
|
|
str_delete(g->failure_str);
|
|
g->failure_str = a1;
|
|
}
|
|
g->B[0] = str_data(loopvar);
|
|
write_failure_if(g, "~B0 > 0", p);
|
|
str_delete(loopvar);
|
|
}
|
|
|
|
static void generate_setmark(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
g->V[0] = p->name;
|
|
writef(g, "~M~V0 = env.Cursor~N", p);
|
|
}
|
|
|
|
static void generate_tomark(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
g->S[0] = p->mode == m_forward ? ">" : "<";
|
|
|
|
w(g, "~Mif env.Cursor ~S0 "); generate_AE(g, p->AE);
|
|
writef(g, " ", p);
|
|
write_block_start(g);
|
|
write_failure(g);
|
|
write_block_end(g);
|
|
g->unreachable = false;
|
|
w(g, "~Menv.Cursor = "); generate_AE(g, p->AE); writef(g, "~N", p);
|
|
}
|
|
|
|
static void generate_atmark(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
w(g, "~Mif env.Cursor != "); generate_AE(g, p->AE);
|
|
writef(g, " ", p);
|
|
write_block_start(g);
|
|
write_failure(g);
|
|
write_block_end(g);
|
|
g->unreachable = false;
|
|
}
|
|
|
|
static void generate_hop(struct generator * g, struct node * p) {
|
|
|
|
write_block_start(g);
|
|
write_comment(g, p);
|
|
g->S[0] = p->mode == m_forward ? "" : "-";
|
|
|
|
w(g, "~Mvar c = env.ByteIndexForHop(~S0(");
|
|
generate_AE(g, p->AE);
|
|
w(g, "))~N");
|
|
|
|
g->S[0] = p->mode == m_forward ? "0" : "env.LimitBackward";
|
|
|
|
write_failure_if(g, "int32(~S0) > c || c > int32(env.Limit)", p);
|
|
writef(g, "~Menv.Cursor = int(c)~N", p);
|
|
write_block_end(g);
|
|
}
|
|
|
|
static void generate_delete(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
writef(g, "~Mif !env.SliceDel() {~N"
|
|
"~+~Mreturn false~N~-"
|
|
"~M}~N", p);
|
|
}
|
|
|
|
|
|
static void generate_next(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
write_check_limit(g, p);
|
|
write_inc_cursor(g, p);
|
|
}
|
|
|
|
static void generate_tolimit(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
g->S[0] = p->mode == m_forward ? "env.Limit" : "env.LimitBackward";
|
|
writef(g, "~Menv.Cursor = ~S0~N", p);
|
|
}
|
|
|
|
static void generate_atlimit(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
g->S[0] = p->mode == m_forward ? "env.Limit" : "env.LimitBackward";
|
|
g->S[1] = p->mode == m_forward ? "<" : ">";
|
|
write_failure_if(g, "env.Cursor ~S1 ~S0", p);
|
|
}
|
|
|
|
static void generate_leftslice(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
g->S[0] = p->mode == m_forward ? "env.Bra" : "env.Ket";
|
|
writef(g, "~M~S0 = env.Cursor~N", p);
|
|
}
|
|
|
|
static void generate_rightslice(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
g->S[0] = p->mode == m_forward ? "env.Ket" : "env.Bra";
|
|
writef(g, "~M~S0 = env.Cursor~N", p);
|
|
}
|
|
|
|
static void generate_assignto(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
g->V[0] = p->name;
|
|
writef(g, "~M~V0 = env.AssignTo()~N", p);
|
|
}
|
|
|
|
static void generate_sliceto(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
g->V[0] = p->name;
|
|
writef(g, "~M~V0 = env.SliceTo()~N"
|
|
"~Mif ~V0 == \"\" {~N"
|
|
"~+~Mreturn false~N~-~M}~N", p);
|
|
}
|
|
|
|
static void generate_address(struct generator * g, struct node * p) {
|
|
|
|
symbol * b = p->literalstring;
|
|
if (b != 0) {
|
|
write_literal_string(g, b);
|
|
} else {
|
|
write_varref(g, p->name);
|
|
}
|
|
}
|
|
|
|
static void generate_insert(struct generator * g, struct node * p, int style) {
|
|
|
|
int keep_c = style == c_attach;
|
|
|
|
write_block_start(g);
|
|
write_comment(g, p);
|
|
if (p->mode == m_backward) keep_c = !keep_c;
|
|
if (keep_c) w(g, "~Mvar c = env.Cursor~N");
|
|
w(g, "~Mbra, ket := env.Cursor, env.Cursor~N");
|
|
writef(g, "~Menv.Insert(bra, ket, ", p);
|
|
generate_address(g, p);
|
|
writef(g, ");~N", p);
|
|
if (keep_c) w(g, "~Menv.Cursor = c~N");
|
|
write_block_end(g);
|
|
}
|
|
|
|
static void generate_assignfrom(struct generator * g, struct node * p) {
|
|
|
|
int keep_c = p->mode == m_forward; /* like 'attach' */
|
|
|
|
write_block_start(g);
|
|
write_comment(g, p);
|
|
if (keep_c) writef(g, "~Mvar c = env.Cursor~N", p);
|
|
if (p->mode == m_forward) {
|
|
writef(g, "~Menv.Insert(env.Cursor, env.Limit, ", p);
|
|
} else {
|
|
writef(g, "~Menv.Insert(env.LimitBackward, env.Cursor, ", p);
|
|
}
|
|
generate_address(g, p);
|
|
writef(g, ")~N", p);
|
|
if (keep_c) w(g, "~Menv.Cursor = c~N");
|
|
write_block_end(g);
|
|
}
|
|
|
|
|
|
static void generate_slicefrom(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
w(g, "~Mif !env.SliceFrom(");
|
|
generate_address(g, p);
|
|
writef(g, ") {~N"
|
|
"~+~Mreturn false~N~-~M}~N", p);
|
|
}
|
|
|
|
static void generate_setlimit(struct generator * g, struct node * p) {
|
|
struct str * savevar = vars_newname(g);
|
|
struct str * varname = vars_newname(g);
|
|
write_comment(g, p);
|
|
write_savecursor(g, p, savevar);
|
|
generate(g, p->left);
|
|
|
|
if (!g->unreachable) {
|
|
g->B[0] = str_data(varname);
|
|
if (p->mode == m_forward) {
|
|
w(g, "~Mvar ~B0 = env.Limit - env.Cursor~N");
|
|
w(g, "~Menv.Limit = env.Cursor~N");
|
|
} else {
|
|
w(g, "~Mvar ~B0 = env.LimitBackward~N");
|
|
w(g, "~Menv.LimitBackward = env.Cursor~N");
|
|
}
|
|
write_restorecursor(g, p, savevar);
|
|
|
|
if (p->mode == m_forward) {
|
|
str_assign(g->failure_str, "env.Limit += ");
|
|
str_append(g->failure_str, varname);
|
|
str_append_string(g->failure_str, ";");
|
|
} else {
|
|
str_assign(g->failure_str, "env.LimitBackward = ");
|
|
str_append(g->failure_str, varname);
|
|
str_append_string(g->failure_str, ";");
|
|
}
|
|
|
|
generate(g, p->aux);
|
|
|
|
if (!g->unreachable) {
|
|
write_margin(g);
|
|
write_str(g, g->failure_str);
|
|
write_newline(g);
|
|
}
|
|
}
|
|
str_delete(varname);
|
|
str_delete(savevar);
|
|
}
|
|
|
|
/* dollar sets snowball up to operate on a string variable as if it were the
|
|
* current string */
|
|
static void generate_dollar(struct generator * g, struct node * p) {
|
|
struct str * savevar_env = vars_newname(g);
|
|
write_comment(g, p);
|
|
g->V[0] = p->name;
|
|
g->B[0] = str_data(savevar_env);
|
|
writef(g, "~Mvar ~B0 = env.Clone()~N"
|
|
"~Menv.SetCurrent(~V0)~N"
|
|
"~Menv.Cursor = 0~N"
|
|
"~Menv.Limit = len(env.Current())~N", p);
|
|
generate(g, p->left);
|
|
if (!g->unreachable) {
|
|
g->V[0] = p->name;
|
|
/* Update string variable. */
|
|
w(g, "~M~V0 = env.Current()~N");
|
|
/* Reset env */
|
|
w(g, "~M*env = *~B0~N");
|
|
}
|
|
str_delete(savevar_env);
|
|
}
|
|
|
|
static void generate_integer_assign(struct generator * g, struct node * p, char * s) {
|
|
|
|
g->V[0] = p->name;
|
|
g->S[0] = s;
|
|
w(g, "~M~V0 ~S0 "); generate_AE(g, p->AE); w(g, "~N");
|
|
}
|
|
|
|
static void generate_integer_test(struct generator * g, struct node * p, char * s) {
|
|
|
|
g->V[0] = p->name;
|
|
g->S[0] = s;
|
|
w(g, "~Mif !(~V0 ~S0 ");
|
|
generate_AE(g, p->AE);
|
|
w(g, ")");
|
|
write_block_start(g);
|
|
write_failure(g);
|
|
write_block_end(g);
|
|
g->unreachable = false;
|
|
}
|
|
|
|
static void generate_call(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
g->V[0] = p->name;
|
|
write_failure_if(g, "!~W0(env, context)", p);
|
|
}
|
|
|
|
static void generate_grouping(struct generator * g, struct node * p, int complement) {
|
|
|
|
struct grouping * q = p->name->grouping;
|
|
g->S[0] = p->mode == m_forward ? "" : "B";
|
|
g->S[1] = complement ? "Out" : "In";
|
|
g->V[0] = p->name;
|
|
g->I[0] = q->smallest_ch;
|
|
g->I[1] = q->largest_ch;
|
|
write_failure_if(g, "!env.~S1Grouping~S0(~W0, ~I0, ~I1)", p);
|
|
}
|
|
|
|
static void generate_namedstring(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
g->S[0] = p->mode == m_forward ? "" : "B";
|
|
g->V[0] = p->name;
|
|
write_failure_if(g, "!env.EqS~S0(~V0)", p);
|
|
}
|
|
|
|
static void generate_literalstring(struct generator * g, struct node * p) {
|
|
symbol * b = p->literalstring;
|
|
write_comment(g, p);
|
|
g->S[0] = p->mode == m_forward ? "" : "B";
|
|
g->L[0] = b;
|
|
write_failure_if(g, "!env.EqS~S0(~L0)", p);
|
|
}
|
|
|
|
static void generate_setup_context(struct generator * g) {
|
|
|
|
struct name * q;
|
|
w(g, "~Mvar context = &Context {~+~N");
|
|
for (q = g->analyser->names; q; q = q->next) {
|
|
g->V[0] = q;
|
|
switch (q->type) {
|
|
case t_string:
|
|
w(g, "~M~W0: \"\",~N");
|
|
break;
|
|
case t_integer:
|
|
w(g, "~M~W0: 0,~N");
|
|
break;
|
|
case t_boolean:
|
|
w(g, "~M~W0: false,~N");
|
|
break;
|
|
}
|
|
}
|
|
w(g, "~-~M}~N");
|
|
w(g, "~M_ = context~N");
|
|
}
|
|
|
|
static void generate_define(struct generator * g, struct node * p) {
|
|
struct name * q = p->name;
|
|
|
|
struct str * saved_output = g->outbuf;
|
|
|
|
g->V[0] = q;
|
|
|
|
if (q->type == t_routine) {
|
|
w(g, "~N~Mfunc ~W0(env *snowballRuntime.Env, ctx interface{}) bool {~+~N");
|
|
w(g, "~Mcontext := ctx.(*Context)~N");
|
|
w(g, "~M_ = context~N");
|
|
} else {
|
|
w(g, "~N~Mfunc ~W0(env *snowballRuntime.Env) bool {~+~N");
|
|
generate_setup_context(g);
|
|
}
|
|
if (p->amongvar_needed) w(g, "~Mvar among_var int32~N");
|
|
g->outbuf = str_new();
|
|
|
|
g->next_label = 0;
|
|
g->var_number = 0;
|
|
|
|
str_clear(g->failure_str);
|
|
g->failure_label = x_return;
|
|
g->unreachable = false;
|
|
generate(g, p->left);
|
|
if (!g->unreachable) w(g, "~Mreturn true~N");
|
|
w(g, "~-~M}~N");
|
|
|
|
str_append(saved_output, g->outbuf);
|
|
str_delete(g->outbuf);
|
|
g->outbuf = saved_output;
|
|
}
|
|
|
|
static void generate_substring(struct generator * g, struct node * p) {
|
|
|
|
struct among * x = p->among;
|
|
|
|
write_comment(g, p);
|
|
|
|
g->S[0] = p->mode == m_forward ? "" : "B";
|
|
g->I[0] = x->number;
|
|
|
|
if (x->command_count == 0 && x->starter == 0) {
|
|
write_failure_if(g, "env.FindAmong~S0(~A_~I0, context) == 0", p);
|
|
} else {
|
|
writef(g, "~Mamong_var = env.FindAmong~S0(~A_~I0, context)~N", p);
|
|
write_failure_if(g, "among_var == 0", p);
|
|
}
|
|
}
|
|
|
|
static void generate_among(struct generator * g, struct node * p) {
|
|
|
|
struct among * x = p->among;
|
|
int case_number = 1;
|
|
|
|
if (x->substring == 0) generate_substring(g, p);
|
|
if (x->command_count == 0 && x->starter == 0) return;
|
|
|
|
if (x->starter != 0) generate(g, x->starter);
|
|
|
|
p = p->left;
|
|
if (p != 0 && p->type != c_literalstring) p = p->right;
|
|
w(g, "~Mif among_var == 0 {~N~+");
|
|
write_failure(g);
|
|
g->unreachable = false;
|
|
w(g, "~-~M}");
|
|
|
|
while (p) {
|
|
if (p->type == c_bra && p->left != 0) {
|
|
g->I[0] = case_number++;
|
|
w(g, " else if among_var == ~I0 {~N~+");
|
|
generate(g, p);
|
|
w(g, "~-~M}");
|
|
g->unreachable = false;
|
|
}
|
|
p = p->right;
|
|
}
|
|
w(g, "~N");
|
|
}
|
|
|
|
static void generate_booltest(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
g->V[0] = p->name;
|
|
write_failure_if(g, "!~V0", p);
|
|
}
|
|
|
|
static void generate_false(struct generator * g, struct node * p) {
|
|
|
|
write_comment(g, p);
|
|
write_failure(g);
|
|
}
|
|
|
|
static void generate_debug(struct generator * g, struct node * p) {
|
|
write_comment(g, p);
|
|
g->I[0] = g->debug_count++;
|
|
g->I[1] = p->line_number;
|
|
writef(g, "~Menv.Debug(~I0, ~I1)~N", p);
|
|
}
|
|
|
|
static void generate(struct generator * g, struct node * p) {
|
|
|
|
int a0;
|
|
struct str * a1;
|
|
|
|
if (g->unreachable) return;
|
|
|
|
a0 = g->failure_label;
|
|
a1 = str_copy(g->failure_str);
|
|
|
|
switch (p->type)
|
|
{
|
|
case c_define: generate_define(g, p); break;
|
|
case c_bra: generate_bra(g, p); break;
|
|
case c_and: generate_and(g, p); break;
|
|
case c_or: generate_or(g, p); break;
|
|
case c_backwards: generate_backwards(g, p); break;
|
|
case c_not: generate_not(g, p); break;
|
|
case c_set: generate_set(g, p); break;
|
|
case c_unset: generate_unset(g, p); break;
|
|
case c_try: generate_try(g, p); break;
|
|
case c_fail: generate_fail(g, p); break;
|
|
case c_reverse:
|
|
case c_test: generate_test(g, p); break;
|
|
case c_do: generate_do(g, p); break;
|
|
case c_goto: generate_GO(g, p, 1); break;
|
|
case c_gopast: generate_GO(g, p, 0); break;
|
|
case c_repeat: generate_repeat(g, p, 0); break;
|
|
case c_loop: generate_loop(g, p); break;
|
|
case c_atleast: generate_atleast(g, p); break;
|
|
case c_setmark: generate_setmark(g, p); break;
|
|
case c_tomark: generate_tomark(g, p); break;
|
|
case c_atmark: generate_atmark(g, p); break;
|
|
case c_hop: generate_hop(g, p); break;
|
|
case c_delete: generate_delete(g, p); break;
|
|
case c_next: generate_next(g, p); break;
|
|
case c_tolimit: generate_tolimit(g, p); break;
|
|
case c_atlimit: generate_atlimit(g, p); break;
|
|
case c_leftslice: generate_leftslice(g, p); break;
|
|
case c_rightslice: generate_rightslice(g, p); break;
|
|
case c_assignto: generate_assignto(g, p); break;
|
|
case c_sliceto: generate_sliceto(g, p); break;
|
|
case c_assign: generate_assignfrom(g, p); break;
|
|
case c_insert:
|
|
case c_attach: generate_insert(g, p, p->type); break;
|
|
case c_slicefrom: generate_slicefrom(g, p); break;
|
|
case c_setlimit: generate_setlimit(g, p); break;
|
|
case c_dollar: generate_dollar(g, p); break;
|
|
case c_mathassign: generate_integer_assign(g, p, "="); break;
|
|
case c_plusassign: generate_integer_assign(g, p, "+="); break;
|
|
case c_minusassign: generate_integer_assign(g, p, "-="); break;
|
|
case c_multiplyassign:generate_integer_assign(g, p, "*="); break;
|
|
case c_divideassign: generate_integer_assign(g, p, "/="); break;
|
|
case c_eq: generate_integer_test(g, p, "=="); break;
|
|
case c_ne: generate_integer_test(g, p, "!="); break;
|
|
case c_gr: generate_integer_test(g, p, ">"); break;
|
|
case c_ge: generate_integer_test(g, p, ">="); break;
|
|
case c_ls: generate_integer_test(g, p, "<"); break;
|
|
case c_le: generate_integer_test(g, p, "<="); break;
|
|
case c_call: generate_call(g, p); break;
|
|
case c_grouping: generate_grouping(g, p, false); break;
|
|
case c_non: generate_grouping(g, p, true); break;
|
|
case c_name: generate_namedstring(g, p); break;
|
|
case c_literalstring: generate_literalstring(g, p); break;
|
|
case c_among: generate_among(g, p); break;
|
|
case c_substring: generate_substring(g, p); break;
|
|
case c_booltest: generate_booltest(g, p); break;
|
|
case c_false: generate_false(g, p); break;
|
|
case c_true: break;
|
|
case c_debug: generate_debug(g, p); break;
|
|
default: fprintf(stderr, "%d encountered\n", p->type);
|
|
exit(1);
|
|
}
|
|
|
|
g->failure_label = a0;
|
|
str_delete(g->failure_str);
|
|
g->failure_str = a1;
|
|
}
|
|
|
|
static void generate_start_comment(struct generator * g) {
|
|
|
|
w(g, "//! This file was generated automatically by the Snowball to Go compiler~N");
|
|
w(g, "//! http://snowballstem.org/~N~N");
|
|
}
|
|
|
|
static void generate_class_begin(struct generator * g) {
|
|
w(g, "package ");
|
|
w(g, g->options->go_package);
|
|
w(g, "~N~N");
|
|
|
|
w(g, "import(~N");
|
|
w(g, " snowballRuntime \"");
|
|
w(g, g->options->go_snowball_runtime);
|
|
w(g, "\"~N)~N~N");
|
|
}
|
|
|
|
static void generate_among_table(struct generator * g, struct among * x) {
|
|
|
|
struct amongvec * v = x->b;
|
|
|
|
g->I[0] = x->number;
|
|
g->I[1] = x->literalstring_count;
|
|
|
|
w(g, "~Mvar A_~I0 = []*snowballRuntime.Among{~N~+");
|
|
{
|
|
int i;
|
|
for (i = 0; i < x->literalstring_count; i++)
|
|
{
|
|
g->I[0] = v->i;
|
|
g->I[1] = v->result;
|
|
g->L[0] = v->b;
|
|
g->S[0] = ",";
|
|
|
|
w(g, "~M&snowballRuntime.Among{Str:~L0, A:~I0, B:~I1, ");
|
|
if (v->function != 0)
|
|
{
|
|
w(g, "F:");
|
|
write_varname(g, v->function);
|
|
} else {
|
|
w(g, "F:nil");
|
|
}
|
|
w(g, "}~S0~N");
|
|
v++;
|
|
}
|
|
}
|
|
w(g, "~-~M}~N~N");
|
|
}
|
|
|
|
static void generate_amongs(struct generator * g) {
|
|
struct among * x;
|
|
for (x = g->analyser->amongs; x; x = x->next) {
|
|
generate_among_table(g, x);
|
|
}
|
|
}
|
|
|
|
static void set_bit(symbol * b, int i) { b[i/8] |= 1 << i%8; }
|
|
|
|
static void generate_grouping_table(struct generator * g, struct grouping * q) {
|
|
|
|
int range = q->largest_ch - q->smallest_ch + 1;
|
|
int size = (range + 7)/ 8; /* assume 8 bits per symbol */
|
|
symbol * b = q->b;
|
|
symbol * map = create_b(size);
|
|
int i;
|
|
for (i = 0; i < size; i++) map[i] = 0;
|
|
|
|
for (i = 0; i < SIZE(b); i++) set_bit(map, b[i] - q->smallest_ch);
|
|
|
|
g->V[0] = q->name;
|
|
g->I[0] = size;
|
|
w(g, "~Mvar ~W0 = []byte{");
|
|
for (i = 0; i < size; i++) {
|
|
write_int(g, map[i]);
|
|
if (i < size - 1) w(g, ", ");
|
|
}
|
|
w(g, "}~N~N");
|
|
lose_b(map);
|
|
}
|
|
|
|
static void generate_groupings(struct generator * g) {
|
|
struct grouping * q;
|
|
for (q = g->analyser->groupings; q; q = q->next) {
|
|
generate_grouping_table(g, q);
|
|
}
|
|
}
|
|
|
|
|
|
static void generate_members(struct generator * g) {
|
|
|
|
struct name * q;
|
|
w(g, "type Context struct {~+~N");
|
|
for (q = g->analyser->names; q; q = q->next) {
|
|
g->V[0] = q;
|
|
switch (q->type) {
|
|
case t_string:
|
|
w(g, "~M~W0 string~N");
|
|
break;
|
|
case t_integer:
|
|
w(g, "~M~W0 int~N");
|
|
break;
|
|
case t_boolean:
|
|
w(g, "~M~W0 bool~N");
|
|
break;
|
|
}
|
|
}
|
|
w(g, "~-}~N");
|
|
}
|
|
|
|
static void generate_methods(struct generator * g) {
|
|
|
|
struct node * p = g->analyser->program;
|
|
while (p != 0) {
|
|
generate(g, p);
|
|
g->unreachable = false;
|
|
p = p->right;
|
|
}
|
|
}
|
|
|
|
extern void generate_program_go(struct generator * g) {
|
|
|
|
g->outbuf = str_new();
|
|
g->failure_str = str_new();
|
|
|
|
generate_start_comment(g);
|
|
if (g->analyser->int_limits_used) {
|
|
/* std::usize is used in the code generated for usize::MAX and usize::MIN */
|
|
w(g, "use std::usize;~N~N");
|
|
}
|
|
generate_class_begin(g);
|
|
|
|
generate_amongs(g);
|
|
generate_groupings(g);
|
|
|
|
generate_members(g);
|
|
generate_methods(g);
|
|
|
|
output_str(g->options->output_src, g->outbuf);
|
|
str_delete(g->failure_str);
|
|
str_delete(g->outbuf);
|
|
}
|