void jslGetTokenString(char *str, size_t len) {
if (lex->tk == LEX_ID) {
espruino_snprintf(str, len, "ID:%s", jslGetTokenValueAsString());
} else if (lex->tk == LEX_STR) {
espruino_snprintf(str, len, "String:'%s'", jslGetTokenValueAsString());
} else
jslTokenAsString(lex->tk, str, len);
}
/** When printing out a function, with pretokenise a
* character could end up being a special token. This
* handles that case. */
void jslFunctionCharAsString(unsigned char ch, char *str, size_t len) {
if (ch >= LEX_TOKEN_START) {
jslTokenAsString(ch, str, len);
} else {
str[0] = (char)ch;
str[1] = 0;
}
}
void jslGetTokenString(char *str, size_t len) {
if (lex->tk == LEX_ID) {
strncpy(str, "ID:", len);
strncat(str, jslGetTokenValueAsString(), len);
} else if (lex->tk == LEX_STR) {
strncpy(str, "String:'", len);
strncat(str, jslGetTokenValueAsString(), len);
strncat(str, "'", len);
} else
jslTokenAsString(lex->tk, str, len);
}
/* Match failed - report error message */
static void jslMatchError(int expected_tk) {
char gotStr[30];
char expStr[30];
jslGetTokenString(gotStr, sizeof(gotStr));
jslTokenAsString(expected_tk, expStr, sizeof(expStr));
size_t oldPos = lex->tokenLastStart;
lex->tokenLastStart = jsvStringIteratorGetIndex(&lex->tokenStart.it)-1;
jsExceptionHere(JSET_SYNTAXERROR, "Got %s expected %s", gotStr, expStr);
lex->tokenLastStart = oldPos;
// Sod it, skip this token anyway - stops us looping
jslGetNextToken();
}
/// Match, and return true on success, false on failure
bool jslMatch(JsLex *lex, int expected_tk) {
if (lex->tk != expected_tk) {
char gotStr[16];
char expStr[16];
jslGetTokenString(lex, gotStr, sizeof(gotStr));
jslTokenAsString(expected_tk, expStr, sizeof(expStr));
size_t oldPos = lex->tokenLastStart;
lex->tokenLastStart = jsvStringIteratorGetIndex(&lex->tokenStart.it)-1;
jsExceptionHere(JSET_SYNTAXERROR, "Got %s expected %s", gotStr, expStr);
lex->tokenLastStart = oldPos;
// Sod it, skip this token anyway - stops us looping
jslGetNextToken(lex);
return false;
}
jslGetNextToken(lex);
return true;
}
/// Match, and return true on success, false on failure
bool jslMatch(JsLex *lex, int expected_tk) {
if (lex->tk!=expected_tk) {
char buf[JS_ERROR_BUF_SIZE];
size_t bufpos = 0;
strncpy(&buf[bufpos], "Got ", JS_ERROR_BUF_SIZE-bufpos);
bufpos = strlen(buf);
jslGetTokenString(lex, &buf[bufpos], JS_ERROR_BUF_SIZE-bufpos);
bufpos = strlen(buf);
strncpy(&buf[bufpos], " expected ", JS_ERROR_BUF_SIZE-bufpos);
bufpos = strlen(buf);
jslTokenAsString(expected_tk, &buf[bufpos], JS_ERROR_BUF_SIZE-bufpos);
jsErrorAt(buf, lex, jsvStringIteratorGetIndex(&lex->tokenStart.it));
// Sod it, skip this token anyway - stops us looping
jslGetNextToken(lex);
return false;
}
jslGetNextToken(lex);
return true;
}
JsVar *jswrap_json_parse_internal() {
switch (lex->tk) {
case LEX_R_TRUE: jslGetNextToken(lex); return jsvNewFromBool(true);
case LEX_R_FALSE: jslGetNextToken(lex); return jsvNewFromBool(false);
case LEX_R_NULL: jslGetNextToken(lex); return jsvNewWithFlags(JSV_NULL);
case '-': {
jslGetNextToken(lex);
if (lex->tk!=LEX_INT && lex->tk!=LEX_FLOAT) return 0;
JsVar *v = jswrap_json_parse_internal(lex);
JsVar *zero = jsvNewFromInteger(0);
JsVar *r = jsvMathsOp(zero, v, '-');
jsvUnLock2(v, zero);
return r;
}
case LEX_INT: {
long long v = stringToInt(jslGetTokenValueAsString(lex));
jslGetNextToken(lex);
return jsvNewFromLongInteger(v);
}
case LEX_FLOAT: {
JsVarFloat v = stringToFloat(jslGetTokenValueAsString(lex));
jslGetNextToken(lex);
return jsvNewFromFloat(v);
}
case LEX_STR: {
JsVar *a = jslGetTokenValueAsVar(lex);
jslGetNextToken(lex);
return a;
}
case '[': {
JsVar *arr = jsvNewEmptyArray(); if (!arr) return 0;
jslGetNextToken(lex); // [
while (lex->tk != ']' && !jspHasError()) {
JsVar *value = jswrap_json_parse_internal(lex);
if (!value ||
(lex->tk!=']' && !jslMatch(','))) {
jsvUnLock2(value, arr);
return 0;
}
jsvArrayPush(arr, value);
jsvUnLock(value);
}
if (!jslMatch(']')) {
jsvUnLock(arr);
return 0;
}
return arr;
}
case '{': {
JsVar *obj = jsvNewObject(); if (!obj) return 0;
jslGetNextToken(lex); // {
while (lex->tk == LEX_STR && !jspHasError()) {
JsVar *key = jsvAsArrayIndexAndUnLock(jslGetTokenValueAsVar(lex));
jslGetNextToken(lex);
JsVar *value = 0;
if (!jslMatch(':') ||
!(value=jswrap_json_parse_internal(lex)) ||
(lex->tk!='}' && !jslMatch(','))) {
jsvUnLock3(key, value, obj);
return 0;
}
jsvAddName(obj, jsvMakeIntoVariableName(key, value));
jsvUnLock2(value, key);
}
if (!jslMatch('}')) {
jsvUnLock(obj);
return 0;
}
return obj;
}
default: {
char buf[32];
jslTokenAsString(lex->tk, buf, 32);
jsExceptionHere(JSET_SYNTAXERROR, "Expecting a valid value, got %s", buf);
return 0; // undefined = error
}
}
}