mirror of
https://github.com/ashinn/chibi-scheme.git
synced 2025-05-18 21:29:19 +02:00
adding wip json parser
This commit is contained in:
Alex Shinn
parent
c7d2638fbc
commit
a9cebfb8da
4 changed files with 321 additions and 1 deletions
2
Makefile
2
Makefile
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@ -39,7 +39,7 @@ endif
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CHIBI_COMPILED_LIBS = lib/chibi/filesystem$(SO) lib/chibi/weak$(SO) \
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lib/chibi/heap-stats$(SO) lib/chibi/disasm$(SO) lib/chibi/ast$(SO) \
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lib/chibi/emscripten$(SO)
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lib/chibi/json$(SO) lib/chibi/emscripten$(SO)
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CHIBI_POSIX_COMPILED_LIBS = lib/chibi/process$(SO) lib/chibi/time$(SO) \
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lib/chibi/system$(SO) lib/chibi/stty$(SO) lib/chibi/pty$(SO) \
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lib/chibi/net$(SO)
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64
lib/chibi/json-test.sld
Normal file
64
lib/chibi/json-test.sld
Normal file
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@ -0,0 +1,64 @@
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(define-library (chibi json-test)
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(import (scheme base) (chibi json) (chibi test))
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(export run-tests)
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(begin
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(define (run-tests)
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(test-begin "json")
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(test '((glossary
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(title . "example glossary")
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(GlossDiv
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(title . "S")
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(GlossList
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(GlossEntry
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(ID . "SGML")
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(SortAs . "SGML")
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(GlossTerm . "Standard Generalized Markup Language")
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(Acronym . "SGML")
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(Abbrev . "ISO 8879:1986")
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(GlossDef
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(para . "A meta-markup language, used to create markup languages such as DocBook.")
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(GlossSeeAlso . #("GML" "XML")))
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(GlossSee . "markup"))))))
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(parse-json "{
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\"glossary\": {
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\"title\": \"example glossary\",
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\"GlossDiv\": {
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\"title\": \"S\",
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\"GlossList\": {
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\"GlossEntry\": {
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\"ID\": \"SGML\",
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\"SortAs\": \"SGML\",
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\"GlossTerm\": \"Standard Generalized Markup Language\",
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\"Acronym\": \"SGML\",
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\"Abbrev\": \"ISO 8879:1986\",
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\"GlossDef\": {
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\"para\": \"A meta-markup language, used to create markup languages such as DocBook.\",
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\"GlossSeeAlso\": [\"GML\", \"XML\"]
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},
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\"GlossSee\": \"markup\"
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}
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}
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}
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}
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}"))
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(test '((menu
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(id . "file")
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(value . "File")
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(popup
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(menuitem
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. #(((value . "New") (onclick . "CreateNewDoc()"))
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((value . "Open") (onclick . "OpenDoc()"))
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((value . "Close") (onclick . "CloseDoc()")))))))
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(parse-json "{\"menu\": {
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\"id\": \"file\",
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\"value\": \"File\",
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\"popup\": {
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\"menuitem\": [
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{\"value\": \"New\", \"onclick\": \"CreateNewDoc()\"},
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{\"value\": \"Open\", \"onclick\": \"OpenDoc()\"},
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{\"value\": \"Close\", \"onclick\": \"CloseDoc()\"}
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]
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}
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}}"))
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(test-end))))
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251
lib/chibi/json.c
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251
lib/chibi/json.c
Normal file
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@ -0,0 +1,251 @@
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/* json.c -- fast json parser */
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/* Copyright (c) 2019 Alex Shinn. All rights reserved. */
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/* BSD-style license: http://synthcode.com/license.txt */
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#include <chibi/eval.h>
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sexp parse_json (sexp ctx, sexp self, sexp str, const char* s, int* i, const int len);
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sexp sexp_json_exception (sexp ctx, sexp self, const char* msg, sexp str, const int pos) {
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sexp_gc_var2(res, tmp);
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sexp_gc_preserve2(ctx, res, tmp);
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tmp = sexp_list2(ctx, str, sexp_make_fixnum(pos));
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res = sexp_user_exception(ctx, self, msg, tmp);
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sexp_gc_release2(ctx);
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return res;
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}
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sexp parse_json_number (sexp ctx, sexp self, sexp str, const char* s, int* i, const int len) {
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sexp_sint_t res = 0;
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int j = *i;
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while (j < len && isdigit(s[j]))
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res = res * 10 + s[j++] - '0';
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*i = j;
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return sexp_make_fixnum(res);
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}
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sexp parse_json_literal (sexp ctx, sexp self, sexp str, const char* s, int* i, const int len, const char* name, int namelen, sexp value) {
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sexp res;
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if (strncasecmp(s+*i, name, namelen) == 0 && (*i+namelen >= len || !isalnum(s[*i+namelen]))) {
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res = value;
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*i += namelen;
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} else {
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res = sexp_json_exception(ctx, self, "unexpected character in json at", str, *i);
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}
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return res;
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}
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sexp parse_json_string (sexp ctx, sexp self, sexp str, const char* s, int* i, const int len) {
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sexp_gc_var2(res, tmp);
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sexp_gc_preserve2(ctx, res, tmp);
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int from = *i, to = *i;
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res = SEXP_NULL;
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for ( ; s[to] != '"'; ++to) {
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if (to+1 >= len) {
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res = sexp_json_exception(ctx, self, "unterminated string in json started at", str, *i);
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break;
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}
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if (s[to] == '\\') {
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tmp = sexp_c_string(ctx, s+from, to-from);
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res = sexp_stringp(res) ? sexp_list2(ctx, tmp, res) : sexp_cons(ctx, tmp, res);
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switch (s[++to]) {
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case 'n':
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tmp = sexp_c_string(ctx, "\n", -1);
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res = sexp_cons(ctx, tmp, res);
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from = to+1;
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break;
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case 't':
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tmp = sexp_c_string(ctx, "\t", -1);
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res = sexp_cons(ctx, tmp, res);
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from = to+1;
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break;
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default:
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from = to;
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break;
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}
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}
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}
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if (!sexp_exceptionp(res)) {
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tmp = sexp_c_string(ctx, s+from, to-from);
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if (res == SEXP_NULL) {
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res = tmp;
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} else {
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res = sexp_stringp(res) ? sexp_list2(ctx, tmp, res) : sexp_cons(ctx, tmp, res);
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res = sexp_nreverse(ctx, res);
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res = sexp_string_concatenate(ctx, res, SEXP_FALSE);
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}
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}
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*i = to+1;
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sexp_gc_release2(ctx);
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return res;
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}
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sexp parse_json_array (sexp ctx, sexp self, sexp str, const char* s, int* i, const int len) {
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sexp_gc_var2(res, tmp);
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sexp_gc_preserve2(ctx, res, tmp);
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int j = *i;
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int comma = 1;
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res = SEXP_NULL;
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while (1) {
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if (j >= len) {
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res = sexp_json_exception(ctx, self, "unterminated array in json started at", str, *i);
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break;
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} else if (s[j] == ']') {
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if (comma && res != SEXP_NULL) {
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res = sexp_json_exception(ctx, self, "missing value after comma in json array at", str, j);
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} else {
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res = sexp_nreverse(ctx, res);
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res = sexp_list_to_vector(ctx, res);
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}
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++j;
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break;
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} else if (s[j] == ',' && comma) {
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res = sexp_json_exception(ctx, self, "unexpected comma in json array at", str, j);
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break;
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} else if (s[j] == ',') {
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comma = 1;
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++j;
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} else if (isspace(s[j])) {
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++j;
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} else {
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if (comma) {
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tmp = parse_json(ctx, self, str, s, &j, len);
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if (sexp_exceptionp(tmp)) {
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res = tmp;
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break;
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}
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res = sexp_cons(ctx, tmp, res);
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comma = 0;
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} else {
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res = sexp_json_exception(ctx, self, "unexpected value in json array at", str, j);
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break;
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}
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}
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}
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*i = j;
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sexp_gc_release2(ctx);
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return res;
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}
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sexp parse_json_object (sexp ctx, sexp self, sexp str, const char* s, int* i, const int len) {
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sexp_gc_var2(res, tmp);
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sexp_gc_preserve2(ctx, res, tmp);
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int j = *i;
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int comma = 1;
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res = SEXP_NULL;
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while (1) {
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if (j >= len) {
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res = sexp_json_exception(ctx, self, "unterminated object in json started at", str, *i);
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break;
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} else if (s[j] == '}') {
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if (comma && res != SEXP_NULL) {
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res = sexp_json_exception(ctx, self, "missing value after comma in json object at", str, j);
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} else {
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res = sexp_nreverse(ctx, res);
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}
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++j;
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break;
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} else if (s[j] == ',' && comma) {
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res = sexp_json_exception(ctx, self, "unexpected comma in json object at", str, j);
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break;
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} else if (s[j] == ',') {
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comma = 1;
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++j;
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} else if (isspace(s[j])) {
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++j;
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} else {
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if (comma) {
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tmp = parse_json(ctx, self, str, s, &j, len);
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if (sexp_exceptionp(tmp)) {
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res = tmp;
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break;
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} else if (sexp_stringp(tmp)) {
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tmp = sexp_string_to_symbol(ctx, tmp);
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}
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tmp = sexp_cons(ctx, tmp, SEXP_VOID);
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while (j < len && isspace(s[j]))
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++j;
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if (s[j] != ':') {
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res = sexp_json_exception(ctx, self, "missing colon in json object at", str, j);
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break;
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}
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++j;
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sexp_cdr(tmp) = parse_json(ctx, self, str, s, &j, len);
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if (sexp_exceptionp(sexp_cdr(tmp))) {
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res = sexp_cdr(tmp);
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break;
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}
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res = sexp_cons(ctx, tmp, res);
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comma = 0;
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} else {
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res = sexp_json_exception(ctx, self, "unexpected value in json object at", str, j);
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break;
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}
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}
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}
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*i = j;
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sexp_gc_release2(ctx);
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return res;
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}
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sexp parse_json (sexp ctx, sexp self, sexp str, const char* s, int* i, const int len) {
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sexp res;
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int j = *i;
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while (j < len && isspace(s[j]))
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++j;
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switch (s[j]) {
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case '{':
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++j;
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res = parse_json_object(ctx, self, str, s, &j, len);
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break;
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case '[':
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++j;
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res = parse_json_array(ctx, self, str, s, &j, len);
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break;
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case '"':
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++j;
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res = parse_json_string(ctx, self, str, s, &j, len);
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break;
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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res = parse_json_number(ctx, self, str, s, &j, len);
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break;
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case 'n': case 'N':
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res = parse_json_literal(ctx, self, str, s, &j, len, "null", 4, SEXP_VOID);
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break;
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case 't': case 'T':
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res = parse_json_literal(ctx, self, str, s, &j, len, "true", 4, SEXP_TRUE);
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break;
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case 'f': case 'F':
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res = parse_json_literal(ctx, self, str, s, &j, len, "false", 5, SEXP_FALSE);
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break;
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case '}':
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res = sexp_json_exception(ctx, self, "unexpected closing brace in json at", str, j);
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break;
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case ']':
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res = sexp_json_exception(ctx, self, "unexpected closing bracket in json at", str, j);
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break;
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default:
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res = sexp_json_exception(ctx, self, "unexpected character in json at", str, j);
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break;
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}
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*i = j;
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return res;
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}
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sexp sexp_parse_json (sexp ctx, sexp self, sexp_sint_t n, sexp str) {
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const char *s;
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int i=0, len;
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sexp_assert_type(ctx, sexp_stringp, SEXP_STRING, str);
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s = sexp_string_data(str);
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len = sexp_string_size(str);
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return parse_json(ctx, self, str, s, &i, len);
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}
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sexp sexp_init_library (sexp ctx, sexp self, sexp_sint_t n, sexp env, const char* version, const sexp_abi_identifier_t abi) {
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if (!(sexp_version_compatible(ctx, version, sexp_version)
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&& sexp_abi_compatible(ctx, abi, SEXP_ABI_IDENTIFIER)))
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return SEXP_ABI_ERROR;
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sexp_define_foreign(ctx, env, "parse-json", 1, sexp_parse_json);
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return SEXP_VOID;
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}
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5
lib/chibi/json.sld
Normal file
5
lib/chibi/json.sld
Normal file
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@ -0,0 +1,5 @@
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(define-library (chibi json)
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(import (scheme base))
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(export parse-json)
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(include-shared "json"))
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