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NostrScript

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NostrScript is a WebAssembly implementation that interacts with Damus.
It enables dynamic scripting that can be used to power custom list views,
enabling pluggable algorithms.

The web has JavaScript, Damus has NostrScript. NostrScripts can be
written in any language that compiles to WASM.

This commit adds a WASM interpreter I've written as a mostly-single C
file for portability and embeddability. In the future we could
JIT-compile these for optimal performance if NostrScripts get large and
complicated. For now an interpreter is simple enough for algorithm list
view plugins.

Changelog-Added: Add initial NostrScript implementation
Signed-off-by: William Casarin <jb55@jb55.com>
This commit is contained in:
William Casarin
2023-06-02 18:51:49 -07:00
parent 0c0c58c0cc
commit 97f10e865f
31 changed files with 9623 additions and 117 deletions
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42
damus-c/damus.c
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@@ -28,9 +28,9 @@ static int parse_digit(struct cursor *cur, int *digit) {
}
static int parse_mention_index(struct cursor *cur, struct block *block) {
static int parse_mention_index(struct cursor *cur, struct note_block *block) {
int d1, d2, d3, ind;
const u8 *start = cur->p;
u8 *start = cur->p;
if (!parse_str(cur, "#["))
return 0;
@@ -59,9 +59,9 @@ static int parse_mention_index(struct cursor *cur, struct block *block) {
return 1;
}
static int parse_hashtag(struct cursor *cur, struct block *block) {
static int parse_hashtag(struct cursor *cur, struct note_block *block) {
int c;
const u8 *start = cur->p;
u8 *start = cur->p;
if (!parse_char(cur, '#'))
return 0;
@@ -81,7 +81,7 @@ static int parse_hashtag(struct cursor *cur, struct block *block) {
return 1;
}
static int add_block(struct blocks *blocks, struct block block)
static int add_block(struct note_blocks *blocks, struct note_block block)
{
if (blocks->num_blocks + 1 >= MAX_BLOCKS)
return 0;
@@ -90,9 +90,9 @@ static int add_block(struct blocks *blocks, struct block block)
return 1;
}
static int add_text_block(struct blocks *blocks, const u8 *start, const u8 *end)
static int add_text_block(struct note_blocks *blocks, const u8 *start, const u8 *end)
{
struct block b;
struct note_block b;
if (start == end)
return 1;
@@ -104,8 +104,8 @@ static int add_text_block(struct blocks *blocks, const u8 *start, const u8 *end)
return add_block(blocks, b);
}
static int parse_url(struct cursor *cur, struct block *block) {
const u8 *start = cur->p;
static int parse_url(struct cursor *cur, struct note_block *block) {
u8 *start = cur->p;
if (!parse_str(cur, "http"))
return 0;
@@ -137,8 +137,8 @@ static int parse_url(struct cursor *cur, struct block *block) {
return 1;
}
static int parse_invoice(struct cursor *cur, struct block *block) {
const u8 *start, *end;
static int parse_invoice(struct cursor *cur, struct note_block *block) {
u8 *start, *end;
char *fail;
struct bolt11 *bolt11;
// optional
@@ -177,8 +177,8 @@ static int parse_invoice(struct cursor *cur, struct block *block) {
}
static int parse_mention_bech32(struct cursor *cur, struct block *block) {
const u8 *start = cur->p;
static int parse_mention_bech32(struct cursor *cur, struct note_block *block) {
u8 *start = cur->p;
if (!parse_str(cur, "nostr:"))
return 0;
@@ -197,7 +197,7 @@ static int parse_mention_bech32(struct cursor *cur, struct block *block) {
return 1;
}
static int add_text_then_block(struct cursor *cur, struct blocks *blocks, struct block block, const u8 **start, const u8 *pre_mention)
static int add_text_then_block(struct cursor *cur, struct note_blocks *blocks, struct note_block block, u8 **start, const u8 *pre_mention)
{
if (!add_text_block(blocks, *start, pre_mention))
return 0;
@@ -210,14 +210,14 @@ static int add_text_then_block(struct cursor *cur, struct blocks *blocks, struct
return 1;
}
int damus_parse_content(struct blocks *blocks, const char *content) {
int damus_parse_content(struct note_blocks *blocks, const char *content) {
int cp, c;
struct cursor cur;
struct block block;
const u8 *start, *pre_mention;
struct note_block block;
u8 *start, *pre_mention;
blocks->num_blocks = 0;
make_cursor(&cur, (const u8*)content, strlen(content));
make_cursor((u8*)content, (u8*)content + strlen(content), &cur);
start = cur.p;
while (cur.p < cur.end && blocks->num_blocks < MAX_BLOCKS) {
@@ -256,12 +256,12 @@ int damus_parse_content(struct blocks *blocks, const char *content) {
return 1;
}
void blocks_init(struct blocks *blocks) {
blocks->blocks = malloc(sizeof(struct block) * MAX_BLOCKS);
void blocks_init(struct note_blocks *blocks) {
blocks->blocks = malloc(sizeof(struct note_block) * MAX_BLOCKS);
blocks->num_blocks = 0;
}
void blocks_free(struct blocks *blocks) {
void blocks_free(struct note_blocks *blocks) {
if (!blocks->blocks) {
return;
}