queryparser.h File Reference

#include <QList>
#include <QRegularExpression>
#include <QString>
#include <QStringList>
#include <QVariant>
#include <QVariantMap>
#include <memory>

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Classes
struct	openswmmvis::QueryNode
struct	openswmmvis::QueryPredicate

Namespaces
namespace	openswmmvis

Functions
QueryPredicate	openswmmvis::parseQuery (const QString &whereClause)
QStringList	openswmmvis::queryFieldNames (const QueryPredicate &pred)
bool	openswmmvis::evaluateQuery (const QueryPredicate &pred, const QVariantMap &row)

Detailed Description

Author

Caleb Buahin caleb.nosp@m..bua.nosp@m.hin@g.nosp@m.mail.nosp@m..com

Date

2026

License\n GPL-3.0-or-later

Slice Z.2 — Tiny SQL-like WHERE-clause parser for the Attribute Table's filter bar. Hand-rolled; no SQLite or other dependency.

Grammar (recursive descent, AND binds tighter than OR):

where := orExpr orExpr := andExpr { 'OR' andExpr } andExpr := notExpr { 'AND' notExpr } notExpr := 'NOT' notExpr | primary primary := '(' orExpr ')' | comparison comparison := ident op value | ident 'LIKE' string | ident 'IN' '(' value { ',' value } ')' op := '<' | '<=' | '=' | '!=' | '>' | '>=' ident := bare-identifier | '[' anything-but-]+ ']' | '"' …'"' value := number | quoted-string

Keywords AND / OR / NOT / LIKE / IN are case-insensitive. Identifier matching against row keys is case-sensitive because the column schema keys are themselves (e.g. "Invert elev" vs "invert_elev").

The evaluator runs against a QVariantMap (one row's identify-map), comparing values type-aware: numeric vs string coercion follows QVariant's rules.