{"record":{"id":"c5b58cc3ca478ecc","repo":"Yalantis/uCrop","slug":"cimg-appname-math-parser-cimg-s-s-s-s-miss","errorCode":null,"errorMessage":"[cimg_appname_math_parser] CImg<%s>::%s: %s%s Missing %s, in expression '%s'.","messagePattern":"\\[cimg_appname_math_parser\\] CImg<(.+?)>::(.+?): (.+?)(.+?) Missing (.+?), in expression '(.+?)'\\.","errorType":"exception","errorClass":"CImgArgumentException","httpStatus":null,"severity":"error","filePath":"ucrop/src/main/jni/CImg.h","lineNumber":18128,"sourceCode":"            while (*ss && (cimg::is_blank(*ss) || *ss==';')) ++ss; // Remove leading blanks and ';'\n            while (se>ss && (cimg::is_blank(c1 = *(se - 1)) || c1==';')) --se; // Remove trailing blanks and ';'\n          }\n          while (*ss=='(' && *(se - 1)==')' && std::strchr(ss,')')==se - 1) { // Remove useless start/end parentheses\n            ++ss; --se; c2 = 1;\n          }\n          if (*ss=='_' && ss + 1<se && ss[1]=='(') { // Remove leading '_(something)' comment\n            const unsigned int clevel = level[ss - expr._data];\n            ss+=2;\n            while (ss<se && (*ss!=')' || level[ss - expr._data]!=clevel)) ++ss;\n            if (ss<se) ++ss;\n            if (ss>=se) return _cimg_mp_slot_nan;\n            c2 = 1;\n          }\n        } while (c2 && ss<se);\n\n        if (se<=ss || !*ss) {\n          cimg::strellipsize(expr,64);\n          throw CImgArgumentException(\"[\" cimg_appname \"_math_parser] \"\n                                      \"CImg<%s>::%s: %s%s Missing %s, in expression '%s'.\",\n                                      pixel_type(),_cimg_mp_calling_function,s_op,*s_op?\":\":\"\",\n                                      *s_op=='F'?\"argument\":\"item\",\n                                      ss_op);\n        }\n\n        static const size_t siz_ref = 7*sizeof(unsigned int);\n        const char *const previous_s_op = s_op, *const previous_ss_op = ss_op;\n        const unsigned int depth1 = depth + 1;\n        unsigned int pos, p1, p2, p3, arg1, arg2, arg3, arg4, arg5, arg6;\n        char\n          *const se1 = se - 1, *const se2 = se - 2, *const se3 = se - 3, *const se4 = se - 4,\n          *const ss1 = ss + 1, *const ss2 = ss + 2, *const ss3 = ss + 3, *const ss4 = ss + 4,\n          *const ss5 = ss + 5, *const ss6 = ss + 6, *const ss7 = ss + 7, *const ss8 = ss + 8,\n          *s, *ps, *ns, *s0, *s1, *s2, *s3, sep = 0, end = 0;\n        double val = 0, val1, val2, val3;\n        mp_func op;\n        return_comp = false;","sourceCodeStart":18110,"sourceCodeEnd":18146,"githubUrl":"https://github.com/Yalantis/uCrop/blob/f788b534b48c144edf786c8cddbf0e029e637804/ucrop/src/main/jni/CImg.h#L18110-L18146","documentation":"While compiling the expression, the parser reached the end of the token stream while an operator/function (s_op) still expected an operand. It throws CImgArgumentException stating whether a missing argument (function) or item (operator) was expected, with the position where parsing stopped.","triggerScenarios":"Expressions like \"1+\", \"sin(\", \"max(1,\", or a trailing binary operator; a macro invocation with fewer arguments than declared; truncation of a long expression when passed through a length-limited config key or buffer.","commonSituations":"Hand-edited formula strings in config files with a missing operand; expressions built by string concatenation where a variable interpolated to empty; copy-paste that cut off the tail of the formula.","solutions":["Complete the expression: supply the missing operand/argument before the end of the string.","Check for empty variable/parameter interpolation when building expressions dynamically.","Print the expression (the error truncates it to 64 chars via strellipsize) and verify balanced parentheses and operators.","Validate expressions with a lint/parse step before passing to fill()/eval()."],"exampleFix":"// before\nimg.fill(\"sin(x) + \"); // Missing argument/item\n// after\nimg.fill(\"sin(x) + cos(y)\");","handlingStrategy":"validation","validationCode":"// quick balance check: operators/functions must not end the string\nstd::string s = trim(expr);\nif (s.empty() || is_trailing_operator(s)) return ERR_INCOMPLETE_EXPRESSION;\nimg.fill(s.c_str());","typeGuard":null,"tryCatchPattern":"try {\n  img.fill(expr);\n} catch (const CImgArgumentException& e) {\n  if (strstr(e.what(), \"Missing\")) {\n    // report incomplete formula, show position excerpt from e.what()\n  }\n}","preventionTips":["Check balanced parentheses and no trailing operators before evaluation.","Beware buffer/config truncation of long expressions; use adequate storage.","When building expressions by concatenation, verify each interpolated variable is non-empty.","Lint or parse expressions in a preflight step with clear error reporting."],"tags":["cimg","math-expression","parser","syntax-error"],"backgroundTag":"invalid-argument-format","analyzedSha":"f788b534b48c144edf786c8cddbf0e029e637804","analyzedAt":"2026-09-08T08:36:04.887Z","contentChangedAt":"2026-09-08T08:36:04.887Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}