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Validation.ecl
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Validation.ecl
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EXPORT Validation := MODULE
/**
* Function that executes one or more value validation checks against a dataset
* and appends the result in a well-structured format.
*
* Validation checks are defined within a semicolon-delimited STRING. Each check
* should be in the following format:
*
* <test_name>:<test_ecl>
*
* 'test_name' should be a name somehow representing the check that is
* being performed. The name will be included in the appended data if the
* check fails. Names should start with a letter and may contain letters,
* numbers, periods, dashes, and underscores.
*
* 'test_ecl' is ECL code that performs the test. If a string literal is
* included in the test then the apostrophes must be escaped because test
* is being defined within a string.
*
* The ECL code used during the test is executed within the scope of a single
* dataset record. Syntax-wise, it is similar to creating an ECL filter clause.
* Like a filter, the ECL should evaluate to a BOOLEAN result and what you want
* to do is return TRUE if the data being tested is VALID. Invalid results,
* where the ECL returns FALSE, are what is appended to the dataset.
*
* Validate() imports the Std ECL library, so all standard library functions
* are available for use within a test. Also, because Validate() is a function
* macro, any function that is in scope when Validate() is called may also be
* used within a test. This provides quite a bit of flexibility when it comes
* to writing tests.
*
* Validate() also includes a few internally-defined functions for use within
* your tests as a convenience:
*
* OnlyDigits(s) Convert a single argument to a UTF-8 string and remove
* everything but numeric digits
*
* OnlyChars(s) Convert a single argument to a UTF-8 string and remove
* everything but alphabetic characters
*
* WithoutPunct(s) Convert a single argument to a UTF-8 string and remove
* all punctuation characters
*
* Patternize(s) Create a 'text pattern' from the single argument,
* mapping character classes to a fixed palette:
* lowercase character -> a
* uppercase character -> A
* numeric digit -> 9
* everything else -> unchanged
*
* StrLen(s) Convert a single argument to a UTF-8 string and return
* its length as an unsigned integer
*
* IsOnlyDigits(s) Return TRUE if every character in the value is a digit
*
* IsOnlyUppercase(s) Return TRUE if every character in the value is an
* uppercase character
*
* IsOnlyLowercase(s) Return TRUE if every character in the value is a
* lowercase character
*
* IsDecimalNumber(s) Return TRUE if the value is a number, possibly prefixed
* by a negative sign, and possibly including a decimal
* portion
*
* Example test specifications:
*
* MyValueIsPos:my_value > 0 // my_value must be greater than zero
* SomeNumInRange:some_num BETWEEN 50 AND 100 // some_num must be 50..100
* FIPSLength:StrLen(fips) = 5 // length of FIPS code must be 5
* DatesOrdered:dateBegin <= dateEnd // make sure dates are not flipped
*
* Example specification citing the last two tests from above:
*
* 'FIPSLength:StrLen(fips) = 5;DatesOrdered:dateBegin <= dateEnd'
*
* Invocation information:
*
* @param inFile The dataset to validate; REQUIRED
* @param specStr STRING defining the tests to execute
* (see above for details); REQUIRED
* @param validationRecNameStr STRING defining the name of the child
* record to be appended to the dataset
* containing the results; OPTIONAL,
* defaults to 'validation_results'
*
* @return The input dataset with the results of the validation checks
* appended to each row as a child record. The child record will
* have the following layout:
*
* RECORD
* UNSIGNED2 num_violations;
* SET OF STRING violations;
* END;
*
* The child record's name is normally validation_results but that
* can be overridden via the validationRecNameStr parameter.
*
* The name of a faiing test will appear in the violations SET,
* and the total number of failed tests will be appear in
* num_violations.
*
* @see Fix
*/
EXPORT Validate(inFile, specStr, validationRecNameStr = '\'validation_results\'') := FUNCTIONMACRO
IMPORT Std;
LOADXML('<xml/>');
#EXPORTXML(inFileFields, RECORDOF(inFile));
//-----------------------------------------------------
// Provide specific errors for bad arguments
//-----------------------------------------------------
#IF(TRIM((STRING)specStr, LEFT, RIGHT) = '')
#ERROR('No tests supplied (specStr argument missing or an empty string)')
#END
#IF(TRIM((STRING)validationRecNameStr, LEFT, RIGHT) = '')
#ERROR('validationRecNameStr argument cannot be an empty string')
#END
//-----------------------------------------------------
// Helper coercion functions; these rewrite a value and can be used
// to create a temporary value for testing; these are all reachable
// from within validation specification tests
//-----------------------------------------------------
LOCAL OnlyDigits(s) := FUNCTIONMACRO
RETURN REGEXREPLACE('[^[:digit:]]', (STRING)s, '');
ENDMACRO;
LOCAL OnlyChars(s) := FUNCTIONMACRO
RETURN REGEXREPLACE(U8'[^[:alpha:]]', (UTF8)s, U8'', NOCASE);
ENDMACRO;
LOCAL WithoutPunct(s) := FUNCTIONMACRO
RETURN REGEXREPLACE(U8'[[:punct:]]', (UTF8)s, U8'', NOCASE);
ENDMACRO;
LOCAL Patternize(s) := FUNCTIONMACRO
RETURN REGEXREPLACE(U8'[[:digit:]]', REGEXREPLACE(U8'[[:lower:]]', REGEXREPLACE(U8'[[:upper:]]', (UTF8)s, U8'A'), U8'a'), U8'9');
ENDMACRO;
//-----------------------------------------------------
// Helper test functions; these perform tests against a value;
// all are reachable from within validation specification tests
//-----------------------------------------------------
LOCAL StrLen(s) := FUNCTIONMACRO
RETURN LENGTH((UTF8)s);
ENDMACRO;
LOCAL IsOnlyDigits(s) := FUNCTIONMACRO
RETURN REGEXFIND(U8'^[[:digit:]]+$', (UTF8)s);
ENDMACRO;
LOCAL IsOnlyUppercase(s) := FUNCTIONMACRO
RETURN REGEXFIND(U8'^[[:upper:]]+$', (UTF8)s);
ENDMACRO;
LOCAL IsOnlyLowercase(s) := FUNCTIONMACRO
RETURN REGEXFIND(U8'^[[:lower:]]+$', (UTF8)s);
ENDMACRO;
LOCAL IsDecimalNumber(s) := FUNCTIONMACRO
RETURN REGEXFIND(U8'^-?(?:[[:digit:]]+(\\.[[:digit:]]*)?)|(?:[[:digit:]]*\\.[[:digit:]]+)$', (UTF8)s);
ENDMACRO;
//-----------------------------------------------------
// Collect top-level field names into a regex pattern
//-----------------------------------------------------
#UNIQUENAME(topLevelFieldPattern);
#SET(topLevelFieldPattern, '');
#UNIQUENAME(recLevel);
#SET(recLevel, 0);
#FOR(inFileFields)
#FOR(Field)
#IF(%{@isRecord}% = 1 OR %{@isDataset}% = 1)
#SET(recLevel, %recLevel% + 1)
#ELSEIF(%{@isEnd}% = 1)
#SET(recLevel, %recLevel% - 1)
#ELSEIF(%recLevel% = 0)
#IF(%'topLevelFieldPattern'% = '')
#APPEND(topLevelFieldPattern, '\\b(')
#ELSE
#APPEND(topLevelFieldPattern, '|')
#END
#APPEND(topLevelFieldPattern, %'{@name}'%)
#END
#END
#END
#IF(%'topLevelFieldPattern'% != '')
#APPEND(topLevelFieldPattern, ')\\b')
#END
//-----------------------------------------------------
// Define output record layout
//-----------------------------------------------------
#UNIQUENAME(validationRecName);
#SET(validationRecName, (STRING)validationRecNameStr);
#UNIQUENAME(ValidateRec);
LOCAL %ValidateRec% := RECORD
UNSIGNED2 num_violations;
SET OF STRING violations;
END;
#UNIQUENAME(OutRec);
LOCAL %OutRec% := RECORD
RECORDOF(inFile);
%ValidateRec% %validationRecName%;
END;
//-----------------------------------------------------
// Rewrite test specifications into a single RHS ECL statement suitable for TRANSFORM;
// construct individual tests in the form:
// IF(NOT(test), 'testName', '')
// then make each test a SET element; finally, filter out the empty strings
//-----------------------------------------------------
#UNIQUENAME(tempStr);
#UNIQUENAME(pos);
#UNIQUENAME(numTests);
#UNIQUENAME(testName);
#UNIQUENAME(transformECL);
#UNIQUENAME(oneECLTest);
#UNIQUENAME(trimmedSpecStr);
#SET(trimmedSpecStr, TRIM((STRING)specStr, LEFT, RIGHT));
#SET(transformECL, '(SET OF STRING)[');
#SET(pos, 1);
#SET(numTests, 0);
#LOOP
#IF(%pos% < LENGTH(%'trimmedSpecStr'%))
#SET(tempStr, REGEXFIND('^([^;]+)', %'trimmedSpecStr'%[%pos%..], 1))
#IF(%'tempStr'% != '')
#SET(testName, TRIM(REGEXFIND('^ *([\\w\\.\\-_]+) *:', %'tempStr'%, 1), LEFT, RIGHT))
#IF(%'testName'% != '')
#SET(oneECLTest, TRIM(REGEXFIND(':(.+)', %'tempStr'%, 1), LEFT, RIGHT))
#IF(REGEXFIND('AllFieldsFilled\\(\\)', %'oneECLTest'%, NOCASE))
#SET(oneECLTest, '')
#SET(recLevel, 0);
#FOR(inFileFields)
#FOR(Field)
#IF(%{@isRecord}% = 1 OR %{@isDataset}% = 1)
#SET(recLevel, %recLevel% + 1)
#ELSEIF(%{@isEnd}% = 1)
#SET(recLevel, %recLevel% - 1)
#ELSEIF(%recLevel% = 0)
#IF(%'oneECLTest'% != '')
#APPEND(oneECLTest, ' AND ')
#END
#APPEND(oneECLTest, '(TRIM((STRING)' + %'{@name}'% + ', LEFT, RIGHT) != \'\')')
#END
#END
#END
#END
#IF(%'oneECLTest'% != '')
#SET(oneECLTest, REGEXREPLACE(%'topLevelFieldPattern'%, %'oneECLTest'%, 'LEFT.$1', NOCASE))
#SET(oneECLTest, 'IF(NOT(' + %'oneECLTest'% + '), \'' + %'testName'% + '\', \'\')')
#SET(numTests, %numTests% + 1)
#IF(%numTests% > 1)
#APPEND(transformECL, ', ')
#END
#APPEND(transformECL, %'oneECLTest'%)
#END
#END
#END
#SET(pos, %pos% + LENGTH(%'tempStr'%) + 1)
#ELSE
#BREAK
#END
#END
#APPEND(transformECL, ']');
#SET(transformECL, 'SET(DATASET(' + %'transformECL'% +', {STRING s})(s != \'\'), s)');
//-----------------------------------------------------
// PROJECT through the input dataset, appending our validation transform results
//-----------------------------------------------------
#UNIQUENAME(result);
LOCAL %result% := PROJECT
(
inFile,
TRANSFORM
(
%OutRec%,
SELF.%validationRecName%.violations := %transformECL%,
SELF.%validationRecName%.num_violations := COUNT(SELF.%validationRecName%.violations),
SELF := LEFT
)
);
RETURN %result%;
ENDMACRO;
/**
* Function that applies "fixes" to a dataset, where errors have ben
* previously identified with the Validate() function from this module.
*
* Fixes are defined within a semicolon-delimited STRING. Each fix should
* be in the following format:
*
* <membership_test>:<fix_ecl>
*
* 'membership_test' is a logical clause testing whether one or more tests
* from the Validate() function is true for that record. The presence of a
* single test name means "this test was in violation for this record".
* AND and OR operators may be used in conjunction with multiple test names
* to refine the determination of what went wrong with the record.
* NOT() may be used to invert a test (i.e. "this test was not found to
* be in violation") and is most used in conjunction with another test.
*
* 'fix_ecl' is ECL code that fixes the problem. The most basic fix is
* redefining a field value (e.g. my_field := new_value_expression).
* If a string literal is included in the test then the apostrophes must be
* escaped because tes is being defined within a string. If a REGEXFIND()
* or REGEXREPLACE() function is used and anything within the pattern needs
* to be escaped then the backslash must be double-escaped. ECL already
* requires a single escape (\\. or \\d) but including it in a test here
* means you have to double-escape the backslash: \\\\. or \\\\d.
*
* The ECL code used during the fix is executed within the scope of a single
* dataset record. This means that the expression may reference any field
* in the record.
*
* Fix() imports the Std ECL library, so all standard library functions
* are available for use within a fix. Also, because Fix() is a function
* macro, any function that is in scope when Fix() is called may also be
* used within a fix.
*
* Fix() also includes a few internally-defined functions for use within
* your fixes as a convenience:
*
* OnlyDigits(s) Convert a single argument to a UTF-8 string and remove
* everything but numeric digits
*
* OnlyChars(s) Convert a single argument to a UTF-8 string and remove
* everything but alphabetic characters
*
* WithoutPunct(s) Convert a single argument to a UTF-8 string and remove
* all punctuation characters
*
* Swap(f1, f2) Swap the contents of two named fields
*
* SkipRecord() Remove the current record from the dataset
*
* Given these test specifications used in Validate():
*
* MyValueIsPos:my_value > 0 // my_value must be greater than zero
* SomeNumInRange:some_num BETWEEN 50 AND 100 // some_num must be 50..100
* FIPSLength:StrLen(fips) = 5 // length of FIPS code must be 5
* DatesOrdered:dateBegin <= dateEnd // make sure dates are not flipped
*
* Here some example fix specifications:
*
* MyValueIsPos:my_value := 1 // my_value was < 1, so change it to 1
* SomeNumInRange AND MyValueIsPos:SkipRecord() // Both violations present; just omit record
* FIPSLength:fips := INTFORMAT((INTEGER)fips, 5, 1) // pad the value to 5 digits
* DatesOrdered:Swap(dateBegin, dateEnd) // swap values of dates
*
* Invocation information:
*
* @param inFile The dataset to validate; this should
* contain the child record as appended
* by the Validate() function; REQUIRED
* @param specStr STRING defining the fixes to execute
* (see above for details); REQUIRED
* @param validationRecNameStr STRING defining the name of the child
* record appended to the dataset by the
* Validate() function; OPTIONAL, defaults
* to 'validation_results'
*
* @return The input dataset with the fixes applied and stripped of the
* child record appended by Validate(). The structure of this
* dataset should be the same as the dataset originally supplied
* to the Validate() function.
*
* @see Validate
*/
EXPORT Fix(inFile, specStr, validationRecNameStr = '\'validation_results\'') := FUNCTIONMACRO
IMPORT Std;
LOADXML('<xml/>');
#EXPORTXML(inFileFields, RECORDOF(inFile));
//-----------------------------------------------------
// Provide specific errors for bad arguments
//-----------------------------------------------------
#IF(TRIM((STRING)specStr, LEFT, RIGHT) = '')
#ERROR('No tests supplied (specStr argument missing or an empty string)')
#END
#IF(TRIM((STRING)validationRecNameStr, LEFT, RIGHT) = '')
#ERROR('validationRecNameStr argument cannot be an empty string')
#END
//-----------------------------------------------------
// Helper coercion functions; these rewrite a value and can be used
// to create a temporary value for testing; these are all reachable
// from within validation specification tests
//-----------------------------------------------------
LOCAL OnlyDigits(s) := FUNCTIONMACRO
RETURN REGEXREPLACE('[^[:digit:]]', (STRING)s, '');
ENDMACRO;
LOCAL OnlyChars(s) := FUNCTIONMACRO
RETURN REGEXREPLACE(U8'[^[:alpha:]]', (UTF8)s, U8'', NOCASE);
ENDMACRO;
LOCAL WithoutPunct(s) := FUNCTIONMACRO
RETURN REGEXREPLACE(U8'[[:punct:]]', (UTF8)s, U8'', NOCASE);
ENDMACRO;
//-----------------------------------------------------
// Collect top-level field names into a regex pattern
//-----------------------------------------------------
#UNIQUENAME(topLevelFieldPattern);
#SET(topLevelFieldPattern, '');
#UNIQUENAME(recLevel);
#SET(recLevel, 0);
#FOR(inFileFields)
#FOR(Field)
#IF(%{@isRecord}% = 1 OR %{@isDataset}% = 1)
#SET(recLevel, %recLevel% + 1)
#ELSEIF(%{@isEnd}% = 1)
#SET(recLevel, %recLevel% - 1)
#ELSEIF(%recLevel% = 0)
#IF(%'topLevelFieldPattern'% = '')
#APPEND(topLevelFieldPattern, '\\b(')
#ELSE
#APPEND(topLevelFieldPattern, '|')
#END
#APPEND(topLevelFieldPattern, %'{@name}'%)
#END
#END
#END
#IF(%'topLevelFieldPattern'% != '')
#APPEND(topLevelFieldPattern, ')\\b')
#END
//-----------------------------------------------------
// Define output record layout
//-----------------------------------------------------
#UNIQUENAME(validationRecName);
#SET(validationRecName, (STRING)validationRecNameStr);
#UNIQUENAME(OutRec);
LOCAL %OutRec% := RECORD
RECORDOF(inFile) - [%validationRecName%];
END;
//-----------------------------------------------------
// Walk the supplied specStr
//-----------------------------------------------------
#UNIQUENAME(workingData);
#UNIQUENAME(tempStr);
#UNIQUENAME(pos);
#UNIQUENAME(reasonConstraint);
#UNIQUENAME(oneECLStmt);
#UNIQUENAME(lhsECLTemp);
#UNIQUENAME(lhsECL);
#UNIQUENAME(rhsElse);
#UNIQUENAME(rhsECL);
#UNIQUENAME(field1);
#UNIQUENAME(field2);
#UNIQUENAME(trimmedSpecStr);
#SET(trimmedSpecStr, TRIM((STRING)specStr, LEFT, RIGHT));
#UNIQUENAME(operators);
#SET(operators, '(AND|OR|NOT)');
#UNIQUENAME(dataFilter);
#SET(workingData, #TEXT(inFile));
#SET(pos, 1);
#LOOP
#SET(dataFilter, '')
#SET(oneECLStmt, '')
#IF(%pos% < LENGTH(%'trimmedSpecStr'%))
#SET(tempStr, REGEXFIND('^([^;]+)', %'trimmedSpecStr'%[%pos%..], 1))
#IF(%'tempStr'% != '')
#SET(reasonConstraint, TRIM(REGEXFIND('^([^:]+)', %'tempStr'%, 1), LEFT, RIGHT))
#IF(%'reasonConstraint'% != '')
// Modify logical operators so we cannot find them while parsing violation names
#SET(reasonConstraint, REGEXREPLACE('\\b' + %'operators'% + '\\b', %'reasonConstraint'%, '|$1|', NOCASE))
#SET(reasonConstraint, REGEXREPLACE('\\b([^\\|][\\w\\.\\-_]+[^\\|])\\b', %'reasonConstraint'%, '(\'$1\' IN LEFT.' + validationRecNameStr + '.violations)', NOCASE))
// Put logical operators back
#SET(reasonConstraint, REGEXREPLACE('(\\|' + %'operators'% + '\\|)', %'reasonConstraint'%, '$2', NOCASE))
// Extract the ECL for addressing the violations
#SET(oneECLStmt, TRIM(REGEXFIND(':(.+)', %'tempStr'%, 1), LEFT, RIGHT))
// Assume we have an ECL definition and parse LHS vs RHS
#SET(lhsECLTemp, REGEXFIND('^([\\w\\.\\-_]+) *:=', %'oneECLStmt'%, 1))
#SET(rhsECL, TRIM(REGEXFIND(':= *(.+)', %'oneECLStmt'%, 1), RIGHT))
#SET(rhsElse, REGEXREPLACE(%'topLevelFieldPattern'%, %'lhsECLTemp'%, 'LEFT.$1', NOCASE))
#IF(%'lhsECL'% != '' AND %'rhsECL'% != '')
// We do indeed have a definition; add SELF and LEFT
#SET(lhsECL, REGEXREPLACE(%'topLevelFieldPattern'%, %'lhsECLTemp'%, 'SELF.$1', NOCASE))
#SET(rhsECL, REGEXREPLACE(%'topLevelFieldPattern'%, %'rhsECL'%, 'LEFT.$1', NOCASE))
// Construct the TRANSFORM clause
#SET(oneECLStmt, %'lhsECL'% + ' := IF((' + %'reasonConstraint'% + '), (TYPEOF(' + %'lhsECL'% + '))(' + %'rhsECL'% + '), ' + %'rhsElse'% + ')')
#ELSEIF(REGEXFIND('Swap\\( *' + %'topLevelFieldPattern'% + ' *, *' + %'topLevelFieldPattern'% + '\\)', %'oneECLStmt'%, NOCASE))
// User wants to swap the values in two toplevel fields
#SET(field1, REGEXFIND('SWAP\\( *' + %'topLevelFieldPattern'% + ' *, *' + %'topLevelFieldPattern'% + '\\)', %'oneECLStmt'%, 1, NOCASE))
#SET(field2, REGEXFIND('SWAP\\( *' + %'topLevelFieldPattern'% + ' *, *' + %'topLevelFieldPattern'% + '\\)', %'oneECLStmt'%, 2, NOCASE))
#SET(oneECLStmt, 'SELF.' + %'field1'% + ' := IF((' + %'reasonConstraint'% + '), (TYPEOF(SELF.' + %'field1'% + '))LEFT.' + %'field2'% + ', LEFT.' + %'field1'% + ')')
#APPEND(oneECLStmt, ', SELF.' + %'field2'% + ' := IF((' + %'reasonConstraint'% + '), (TYPEOF(SELF.' + %'field2'% + '))LEFT.' + %'field1'% + ', LEFT.' + %'field2'% + ')')
#ELSEIF(REGEXFIND('^SkipRecord\\(\\)$', %'oneECLStmt'%, NOCASE))
// This should translate into a filter on the input data
#IF(%'dataFilter'% != '')
#APPEND(dataFilter, ' OR ')
#END
#APPEND(dataFilter, '(' + REGEXREPLACE('LEFT\\.', %'reasonConstraint'%, '') + ')')
#SET(oneECLStmt, '')
#ELSE
#ERROR('Unrecognized expression: "' + %'oneECLStmt'% + '"')
#END
#UNIQUENAME(newData)
LOCAL %newData% := PROJECT
(
%workingData%
#IF(%'dataFilter'% != '')
(NOT(%dataFilter%))
#END,
TRANSFORM
(
RECORDOF(LEFT),
#IF(%'oneECLStmt'% != '')
%oneECLStmt%,
#END
SELF := LEFT
)
);
#SET(workingData, %'newData'%)
#END
#END
#SET(pos, %pos% + LENGTH(%'tempStr'%) + 1)
#ELSE
#BREAK
#END
#END
RETURN PROJECT(%workingData%, %OutRec%);
ENDMACRO;
END;