+%{
/*-------------------------------------------------------------------------
*
* jsonpath_scan.l
* Lexical parser for jsonpath datatype
*
+ * Splits jsonpath string into tokens represented as JsonPathString structs.
+ * Decodes unicode and hex escaped strings.
+ *
* Copyright (c) 2019, PostgreSQL Global Development Group
*
* IDENTIFICATION
*-------------------------------------------------------------------------
*/
-%{
#include "postgres.h"
#include "mb/pg_wchar.h"
#include "nodes/pg_list.h"
-#include "utils/jsonpath_scanner.h"
-static string scanstring;
-
-/* No reason to constrain amount of data slurped */
-/* #define YY_READ_BUF_SIZE 16777216 */
+static JsonPathString scanstring;
/* Handles to the buffer that the lexer uses internally */
static YY_BUFFER_STATE scanbufhandle;
static void addstring(bool init, char *s, int l);
static void addchar(bool init, char s);
-static int checkSpecialVal(void); /* examine scanstring for the special
- * value */
-
+static enum yytokentype checkKeyword(void);
static void parseUnicode(char *s, int l);
-static void parseHexChars(char *s, int l);
+static void parseHexChar(char *s);
/* Avoid exit() on fatal scanner errors (a bit ugly -- see yy_fatal_error) */
#undef fprintf
ereport(ERROR, (errmsg_internal("%s", msg)));
}
-#define yyerror jsonpath_yyerror
%}
%option 8bit
%option noyyrealloc
%option noyyfree
-%x xQUOTED
-%x xNONQUOTED
-%x xVARQUOTED
-%x xSINGLEQUOTED
-%x xCOMMENT
+/*
+ * We use exclusive states for quoted and non-quoted strings,
+ * quoted variable names and C-style comments.
+ * Exclusive states:
+ * <xq> - quoted strings
+ * <xnq> - non-quoted strings
+ * <xvq> - quoted variable names
+ * <xc> - C-style comment
+ */
-special [\?\%\$\.\[\]\{\}\(\)\|\&\!\=\<\>\@\#\,\*:\-\+\/]
-any [^\?\%\$\.\[\]\{\}\(\)\|\&\!\=\<\>\@\#\,\*:\-\+\/\\\"\' \t\n\r\f]
+%x xq
+%x xnq
+%x xvq
+%x xc
+
+special [\?\%\$\.\[\]\{\}\(\)\|\&\!\=\<\>\@\#\,\*:\-\+\/]
blank [ \t\n\r\f]
+/* "other" means anything that's not special, blank, or '\' or '"' */
+other [^\?\%\$\.\[\]\{\}\(\)\|\&\!\=\<\>\@\#\,\*:\-\+\/\\\" \t\n\r\f]
+
+digit [0-9]
+integer (0|[1-9]{digit}*)
+decimal {integer}\.{digit}+
+decimalfail {integer}\.
+real ({integer}|{decimal})[Ee][-+]?{digit}+
+realfail1 ({integer}|{decimal})[Ee]
+realfail2 ({integer}|{decimal})[Ee][-+]
+
hex_dig [0-9A-Fa-f]
unicode \\u({hex_dig}{4}|\{{hex_dig}{1,6}\})
+unicodefail \\u({hex_dig}{0,3}|\{{hex_dig}{0,6})
hex_char \\x{hex_dig}{2}
-
+hex_fail \\x{hex_dig}{0,1}
%%
-<INITIAL>\&\& { return AND_P; }
-
-<INITIAL>\|\| { return OR_P; }
-
-<INITIAL>\! { return NOT_P; }
-
-<INITIAL>\*\* { return ANY_P; }
-
-<INITIAL>\< { return LESS_P; }
-
-<INITIAL>\<\= { return LESSEQUAL_P; }
-
-<INITIAL>\=\= { return EQUAL_P; }
-
-<INITIAL>\<\> { return NOTEQUAL_P; }
-
-<INITIAL>\!\= { return NOTEQUAL_P; }
-
-<INITIAL>\>\= { return GREATEREQUAL_P; }
-
-<INITIAL>\> { return GREATER_P; }
-
-<INITIAL>\${any}+ {
- addstring(true, yytext + 1, yyleng - 1);
- addchar(false, '\0');
- yylval->str = scanstring;
- return VARIABLE_P;
- }
-
-<INITIAL>\$\" {
- addchar(true, '\0');
- BEGIN xVARQUOTED;
- }
-
-<INITIAL>{special} { return *yytext; }
-
-<INITIAL>{blank}+ { /* ignore */ }
-
-<INITIAL>\/\* {
- addchar(true, '\0');
- BEGIN xCOMMENT;
+<xnq>{other}+ {
+ addstring(false, yytext, yyleng);
}
-<INITIAL>[0-9]+(\.[0-9]+)?[eE][+-]?[0-9]+ /* float */ {
- addstring(true, yytext, yyleng);
- addchar(false, '\0');
+<xnq>{blank}+ {
yylval->str = scanstring;
- return NUMERIC_P;
+ BEGIN INITIAL;
+ return checkKeyword();
}
-<INITIAL>\.[0-9]+[eE][+-]?[0-9]+ /* float */ {
- addstring(true, yytext, yyleng);
- addchar(false, '\0');
+<xnq>\/\* {
yylval->str = scanstring;
- return NUMERIC_P;
+ BEGIN xc;
}
-<INITIAL>([0-9]+)?\.[0-9]+ {
- addstring(true, yytext, yyleng);
- addchar(false, '\0');
+<xnq>({special}|\") {
yylval->str = scanstring;
- return NUMERIC_P;
+ yyless(0);
+ BEGIN INITIAL;
+ return checkKeyword();
}
-<INITIAL>[0-9]+ {
- addstring(true, yytext, yyleng);
- addchar(false, '\0');
+<xnq><<EOF>> {
yylval->str = scanstring;
- return INT_P;
+ BEGIN INITIAL;
+ return checkKeyword();
}
-<INITIAL>{any}+ {
- addstring(true, yytext, yyleng);
- BEGIN xNONQUOTED;
- }
+<xnq,xq,xvq>\\b { addchar(false, '\b'); }
-<INITIAL>\" {
- addchar(true, '\0');
- BEGIN xQUOTED;
- }
+<xnq,xq,xvq>\\f { addchar(false, '\f'); }
-<INITIAL>\' {
- addchar(true, '\0');
- BEGIN xSINGLEQUOTED;
- }
+<xnq,xq,xvq>\\n { addchar(false, '\n'); }
-<INITIAL>\\ {
- yyless(0);
- addchar(true, '\0');
- BEGIN xNONQUOTED;
- }
+<xnq,xq,xvq>\\r { addchar(false, '\r'); }
-<xNONQUOTED>{any}+ {
- addstring(false, yytext, yyleng);
- }
+<xnq,xq,xvq>\\t { addchar(false, '\t'); }
-<xNONQUOTED>{blank}+ {
- yylval->str = scanstring;
- BEGIN INITIAL;
- return checkSpecialVal();
- }
+<xnq,xq,xvq>\\v { addchar(false, '\v'); }
+<xnq,xq,xvq>{unicode}+ { parseUnicode(yytext, yyleng); }
-<xNONQUOTED>\/\* {
- yylval->str = scanstring;
- BEGIN xCOMMENT;
- }
+<xnq,xq,xvq>{hex_char} { parseHexChar(yytext); }
+
+<xnq,xq,xvq>{unicode}*{unicodefail} { yyerror(NULL, "invalid unicode sequence"); }
+
+<xnq,xq,xvq>{hex_fail} { yyerror(NULL, "invalid hex character sequence"); }
+
+<xnq,xq,xvq>{unicode}+\\ {
+ /* throw back the \\, and treat as unicode */
+ yyless(yyleng - 1);
+ parseUnicode(yytext, yyleng);
+ }
+
+<xnq,xq,xvq>\\. { addchar(false, yytext[1]); }
-<xNONQUOTED>({special}|\"|\') {
+<xnq,xq,xvq>\\ { yyerror(NULL, "unexpected end after backslash"); }
+
+<xq,xvq><<EOF>> { yyerror(NULL, "unexpected end of quoted string"); }
+
+<xq>\" {
yylval->str = scanstring;
- yyless(0);
BEGIN INITIAL;
- return checkSpecialVal();
+ return STRING_P;
}
-<xNONQUOTED><<EOF>> {
+<xvq>\" {
yylval->str = scanstring;
BEGIN INITIAL;
- return checkSpecialVal();
+ return VARIABLE_P;
}
-<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\[\"\'\\] { addchar(false, yytext[1]); }
+<xq,xvq>[^\\\"]+ { addstring(false, yytext, yyleng); }
-<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\b { addchar(false, '\b'); }
+<xc>\*\/ { BEGIN INITIAL; }
-<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\f { addchar(false, '\f'); }
+<xc>[^\*]+ { }
-<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\n { addchar(false, '\n'); }
+<xc>\* { }
-<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\r { addchar(false, '\r'); }
+<xc><<EOF>> { yyerror(NULL, "unexpected end of comment"); }
-<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\t { addchar(false, '\t'); }
+\&\& { return AND_P; }
-<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\v { addchar(false, '\v'); }
+\|\| { return OR_P; }
-<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>{unicode}+ { parseUnicode(yytext, yyleng); }
+\! { return NOT_P; }
-<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>{hex_char}+ { parseHexChars(yytext, yyleng); }
+\*\* { return ANY_P; }
-<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\x { yyerror(NULL, "Hex character sequence is invalid"); }
+\< { return LESS_P; }
-<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\u { yyerror(NULL, "Unicode sequence is invalid"); }
+\<\= { return LESSEQUAL_P; }
-<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\. { yyerror(NULL, "Escape sequence is invalid"); }
+\=\= { return EQUAL_P; }
-<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\ { yyerror(NULL, "Unexpected end after backslash"); }
+\<\> { return NOTEQUAL_P; }
-<xQUOTED,xVARQUOTED,xSINGLEQUOTED><<EOF>> { yyerror(NULL, "Unexpected end of quoted string"); }
+\!\= { return NOTEQUAL_P; }
-<xQUOTED>\" {
+\>\= { return GREATEREQUAL_P; }
+
+\> { return GREATER_P; }
+
+\${other}+ {
+ addstring(true, yytext + 1, yyleng - 1);
+ addchar(false, '\0');
yylval->str = scanstring;
- BEGIN INITIAL;
- return STRING_P;
+ return VARIABLE_P;
+ }
+
+\$\" {
+ addchar(true, '\0');
+ BEGIN xvq;
+ }
+
+{special} { return *yytext; }
+
+{blank}+ { /* ignore */ }
+
+\/\* {
+ addchar(true, '\0');
+ BEGIN xc;
}
-<xVARQUOTED>\" {
+{real} {
+ addstring(true, yytext, yyleng);
+ addchar(false, '\0');
yylval->str = scanstring;
- BEGIN INITIAL;
- return VARIABLE_P;
+ return NUMERIC_P;
}
-<xSINGLEQUOTED>\' {
+{decimal} {
+ addstring(true, yytext, yyleng);
+ addchar(false, '\0');
yylval->str = scanstring;
- BEGIN INITIAL;
- return STRING_P;
+ return NUMERIC_P;
}
-<xQUOTED,xVARQUOTED>[^\\\"]+ { addstring(false, yytext, yyleng); }
+{integer} {
+ addstring(true, yytext, yyleng);
+ addchar(false, '\0');
+ yylval->str = scanstring;
+ return INT_P;
+ }
-<xSINGLEQUOTED>[^\\\']+ { addstring(false, yytext, yyleng); }
+{decimalfail} {
+ /* throw back the ., and treat as integer */
+ yyless(yyleng - 1);
+ addstring(true, yytext, yyleng);
+ addchar(false, '\0');
+ yylval->str = scanstring;
+ return INT_P;
+ }
-<INITIAL><<EOF>> { yyterminate(); }
+({realfail1}|{realfail2}) { yyerror(NULL, "invalid floating point number"); }
-<xCOMMENT>\*\/ { BEGIN INITIAL; }
+\" {
+ addchar(true, '\0');
+ BEGIN xq;
+ }
-<xCOMMENT>[^\*]+ { }
+\\ {
+ yyless(0);
+ addchar(true, '\0');
+ BEGIN xnq;
+ }
-<xCOMMENT>\* { }
+{other}+ {
+ addstring(true, yytext, yyleng);
+ BEGIN xnq;
+ }
-<xCOMMENT><<EOF>> { yyerror(NULL, "Unexpected end of comment"); }
+<<EOF>> { yyterminate(); }
%%
{
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
- errmsg("bad jsonpath representation"),
/* translator: %s is typically "syntax error" */
- errdetail("%s at end of input", message)));
+ errmsg("%s at end of jsonpath input", _(message))));
}
else
{
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
- errmsg("bad jsonpath representation"),
/* translator: first %s is typically "syntax error" */
- errdetail("%s at or near \"%s\"", message, yytext)));
+ errmsg("%s at or near \"%s\" of jsonpath input",
+ _(message), yytext)));
}
}
-typedef struct keyword
+typedef struct JsonPathKeyword
{
- int16 len;
- bool lowercase;
- int val;
- char *keyword;
-} keyword;
+ int16 len;
+ bool lowercase;
+ int val;
+ const char *keyword;
+} JsonPathKeyword;
/*
* Array of key words should be sorted by length and then
* alphabetical order
*/
-
-static keyword keywords[] = {
+static const JsonPathKeyword keywords[] = {
{ 2, false, IS_P, "is"},
{ 2, false, TO_P, "to"},
{ 3, false, ABS_P, "abs"},
{ 6, false, STRICT_P, "strict"},
{ 7, false, CEILING_P, "ceiling"},
{ 7, false, UNKNOWN_P, "unknown"},
+ { 8, false, DATETIME_P, "datetime"},
{ 8, false, KEYVALUE_P, "keyvalue"},
{ 10,false, LIKE_REGEX_P, "like_regex"},
};
-static int
-checkSpecialVal()
+/* Check if current scanstring value is a keyword */
+static enum yytokentype
+checkKeyword()
{
- int res = IDENT_P;
- int diff;
- keyword *StopLow = keywords,
- *StopHigh = keywords + lengthof(keywords),
- *StopMiddle;
+ int res = IDENT_P;
+ int diff;
+ const JsonPathKeyword *StopLow = keywords,
+ *StopHigh = keywords + lengthof(keywords),
+ *StopMiddle;
if (scanstring.len > keywords[lengthof(keywords) - 1].len)
return res;
- while(StopLow < StopHigh)
+ while (StopLow < StopHigh)
{
StopMiddle = StopLow + ((StopHigh - StopLow) >> 1);
pfree(scanbuf);
}
+/*
+ * Resize scanstring so that it can append string of given length.
+ * Reinitialize if required.
+ */
static void
-addstring(bool init, char *s, int l)
+resizeString(bool init, int appendLen)
{
if (init)
{
- scanstring.total = 32;
- scanstring.val = palloc(scanstring.total);
+ scanstring.total = Max(32, appendLen);
+ scanstring.val = (char *) palloc(scanstring.total);
scanstring.len = 0;
}
-
- if (s && l)
+ else
{
- while(scanstring.len + l + 1 >= scanstring.total)
+ if (scanstring.len + appendLen >= scanstring.total)
{
- scanstring.total *= 2;
+ while (scanstring.len + appendLen >= scanstring.total)
+ scanstring.total *= 2;
scanstring.val = repalloc(scanstring.val, scanstring.total);
}
-
- memcpy(scanstring.val + scanstring.len, s, l);
- scanstring.len += l;
}
}
+/* Add set of bytes at "s" of length "l" to scanstring */
static void
-addchar(bool init, char s)
+addstring(bool init, char *s, int l)
{
- if (init)
- {
- scanstring.total = 32;
- scanstring.val = palloc(scanstring.total);
- scanstring.len = 0;
- }
- else if(scanstring.len + 1 >= scanstring.total)
- {
- scanstring.total *= 2;
- scanstring.val = repalloc(scanstring.val, scanstring.total);
- }
+ resizeString(init, l + 1);
+ memcpy(scanstring.val + scanstring.len, s, l);
+ scanstring.len += l;
+}
- scanstring.val[ scanstring.len ] = s;
- if (s != '\0')
+/* Add single byte "c" to scanstring */
+static void
+addchar(bool init, char c)
+{
+ resizeString(init, 1);
+ scanstring.val[scanstring.len] = c;
+ if (c != '\0')
scanstring.len++;
}
+/* Interface to jsonpath parser */
JsonPathParseResult *
parsejsonpath(const char *str, int len)
{
jsonpath_scanner_init(str, len);
- if (jsonpath_yyparse((void*)&parseresult) != 0)
- jsonpath_yyerror(NULL, "bugus input");
+ if (jsonpath_yyparse((void *) &parseresult) != 0)
+ jsonpath_yyerror(NULL, "bogus input"); /* shouldn't happen */
jsonpath_scanner_finish();
return parseresult;
}
+/* Turn hex character into integer */
static int
hexval(char c)
{
return c - 'a' + 0xA;
if (c >= 'A' && c <= 'F')
return c - 'A' + 0xA;
- elog(ERROR, "invalid hexadecimal digit");
+ jsonpath_yyerror(NULL, "invalid hexadecimal digit");
return 0; /* not reached */
}
+/* Add given unicode character to scanstring */
static void
addUnicodeChar(int ch)
{
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
- errmsg("invalid input syntax for type jsonpath"),
+ errmsg("invalid input syntax for type %s", "jsonpath"),
errdetail("Unicode escape values cannot be used for code "
"point values above 007F when the server encoding "
"is not UTF8.")));
}
}
+/* Add unicode character and process its hi surrogate */
static void
addUnicode(int ch, int *hi_surrogate)
{
if (*hi_surrogate != -1)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
- errmsg("invalid input syntax for type jsonpath"),
+ errmsg("invalid input syntax for type %s", "jsonpath"),
errdetail("Unicode high surrogate must not follow "
"a high surrogate.")));
*hi_surrogate = (ch & 0x3ff) << 10;
if (*hi_surrogate == -1)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
- errmsg("invalid input syntax for type jsonpath"),
+ errmsg("invalid input syntax for type %s", "jsonpath"),
errdetail("Unicode low surrogate must follow a high "
"surrogate.")));
ch = 0x10000 + *hi_surrogate + (ch & 0x3ff);
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
- errmsg("invalid input syntax for type jsonpath"),
+ errmsg("invalid input syntax for type %s", "jsonpath"),
errdetail("Unicode low surrogate must follow a high "
"surrogate.")));
}
static void
parseUnicode(char *s, int l)
{
- int i;
+ int i = 2;
int hi_surrogate = -1;
for (i = 2; i < l; i += 2) /* skip '\u' */
{
while (s[++i] != '}' && i < l)
ch = (ch << 4) | hexval(s[i]);
- i++; /* ski p '}' */
+ i++; /* skip '}' */
}
else /* parse '\uXXXX' */
{
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
- errmsg("invalid input syntax for type jsonpath"),
+ errmsg("invalid input syntax for type %s", "jsonpath"),
errdetail("Unicode low surrogate must follow a high "
"surrogate.")));
}
}
+/* Parse sequence of hex-encoded characters */
static void
-parseHexChars(char *s, int l)
+parseHexChar(char *s)
{
- int i;
-
- Assert(l % 4 /* \xXX */ == 0);
-
- for (i = 0; i < l / 4; i++)
- {
- int ch = (hexval(s[i * 4 + 2]) << 4) | hexval(s[i * 4 + 3]);
+ int ch = (hexval(s[2]) << 4) |
+ hexval(s[3]);
- addUnicodeChar(ch);
- }
+ addUnicodeChar(ch);
}
/*
if (ptr)
pfree(ptr);
}
-
projects / postgresql / blobdiff