fix(properties): preserve literal text

Separate numeric fields from names and content so only numeric property values are evaluated as expressions.

Refs #809

src/app/expr_eval.rs

@@ -433,6 +433,9 @@ pub fn eval_to_string(input: &str) -> String {
         let mut found = false;
         // Try longest substring first (greedy)
         for end in (i + 1..=len).rev() {
+            if !starts_and_ends_on_word_boundary(&chars, i, end) {
+                continue;
+            }
             let sub: String = chars[i..end].iter().collect();
             if let Some(v) = eval_number(&sub) {
                 result.push_str(&format!("{}", v));
@@ -449,6 +452,37 @@ pub fn eval_to_string(input: &str) -> String {
     result
 }
 
+/// Rejects expression candidates cut from a surrounding identifier.
+fn starts_and_ends_on_word_boundary(chars: &[char], start: usize, end: usize) -> bool {
+    fn is_word(c: char) -> bool {
+        c.is_alphanumeric() || c == '_'
+    }
+    fn starts_ident(c: char) -> bool {
+        c.is_alphabetic() || c == '_'
+    }
+
+    // First token is an identifier: a word character just before it means this
+    // is the tail of a longer word rather than a name of its own.
+    if starts_ident(chars[start]) && start > 0 && is_word(chars[start - 1]) {
+        return false;
+    }
+
+    // Last token is an identifier when the trailing run of word characters
+    // begins with a letter or `_`. A word character just after `end` means that
+    // identifier continues past the candidate.
+    if end < chars.len() && is_word(chars[end]) {
+        let mut run = end;
+        while run > start && is_word(chars[run - 1]) {
+            run -= 1;
+        }
+        if run < end && starts_ident(chars[run]) {
+            return false;
+        }
+    }
+
+    true
+}
+
 // ── Tests ───────────────────────────────────────────────────────────
 
 #[cfg(test)]
@@ -615,6 +649,27 @@ mod tests {
         assert_eq!(eval_to_string("abs(-5),ceil(3.1)"), "5,4");
     }
 
+    #[test]
+    fn embedded_identifier_inside_a_word_is_left_alone() {
+        // Known names must stay unchanged inside identifiers.
+        assert_eq!(eval_to_string("ASPIRATORE"), "ASPIRATORE");
+        assert_eq!(eval_to_string("PIRATE"), "PIRATE");
+        assert_eq!(eval_to_string("copies"), "copies");
+        assert_eq!(eval_to_string("TOPI"), "TOPI");
+        assert_eq!(eval_to_string("pi_2"), "pi_2");
+        assert_eq!(eval_to_string("şpiş"), "şpiş");
+        assert_eq!(eval_to_string("копияpi"), "копияpi");
+        // A standalone `pi` still is a constant.
+        assert_eq!(
+            eval_to_string("pipe,pi"),
+            format!("pipe,{}", std::f64::consts::PI)
+        );
+        assert_eq!(
+            eval_to_string("2*pi,0"),
+            format!("{},0", 2.0 * std::f64::consts::PI)
+        );
+    }
+
     #[test]
     fn embedded_expr_no_evaluables() {
         assert_eq!(eval_to_string("abc,def"), "abc,def");

src/app/properties.rs

@@ -837,7 +837,7 @@ impl OpenCADStudio {
                             geom.props.push(crate::scene::model::object::Property {
                                 label: t!("Frozen Layers").into_owned(),
                                 field: "frozen_layers",
-                                value: crate::scene::model::object::PropValue::EditText(
+                                value: crate::scene::model::object::PropValue::PlainText(
                                     frozen_names.join(", "),
                                 ),
                             });
@@ -903,15 +903,17 @@ impl OpenCADStudio {
                             .filter(|n| !n.is_empty())
                             .collect();
                         if !dim_style_names.is_empty() {
-                            // Current style is already shown as EditText in the geom section;
+                            // Current style is already shown as text in the geom section;
                             // replace/upgrade it to a Choice if we have a list.
                             if let Some(geom) = sections.last_mut() {
-                                // Find and replace the style_name EditText with a Choice.
+                                // Replace the style name with a choice.
                                 if let Some(prop) =
                                     geom.props.iter_mut().find(|p| p.field == "style_name")
                                 {
                                     let current = match &prop.value {
-                                        crate::scene::model::object::PropValue::EditText(s) => s.clone(),
+                                        crate::scene::model::object::PropValue::PlainText(s) => {
+                                            s.clone()
+                                        }
                                         _ => String::new(),
                                     };
                                     prop.value = crate::scene::model::object::PropValue::Choice {
@@ -1044,7 +1046,7 @@ impl OpenCADStudio {
                                         .find(|p| p.field == "dimension_style")
                                     {
                                         let cur = match &p.value {
-                                            crate::scene::model::object::PropValue::EditText(s) => {
+                                            crate::scene::model::object::PropValue::PlainText(s) => {
                                                 s.clone()
                                             }
                                             _ => ld.dimension_style.clone(),
@@ -1979,6 +1981,7 @@ fn make_sections_read_only(
         let text = match &property.value {
             PropValue::ReadOnly(value)
             | PropValue::EditText(value)
+            | PropValue::PlainText(value)
             | PropValue::LayerChoice(value)
             | PropValue::LinetypeChoice(value)
             | PropValue::HatchPatternChoice(value) => value.clone(),
@@ -2159,6 +2162,9 @@ fn merge_prop_value(
         (PropValue::EditText(_), PropValue::EditText(_)) => {
             PropValue::EditText(VARIES_LABEL.into())
         }
+        (PropValue::PlainText(_), PropValue::PlainText(_)) => {
+            PropValue::PlainText(VARIES_LABEL.into())
+        }
         (PropValue::ReadOnly(_), PropValue::ReadOnly(_)) => {
             PropValue::ReadOnly(VARIES_LABEL.into())
         }

src/app/update/command.rs

@@ -14,7 +14,7 @@ use crate::scene::pick::grip::{
 };
 #[cfg(not(target_arch = "wasm32"))]
 use crate::plugin::v4_support;
-use crate::scene::model::object::GripApply;
+use crate::scene::model::object::{GripApply, PropValue};
 use crate::scene::{
     self, hover_id, CubeRegion, Scene, VIEWCUBE_DRAW_PX, VIEWCUBE_PAD, VIEWCUBE_PX,
 };
@@ -2168,17 +2168,24 @@ pub(super) fn on_tab_close(&mut self, idx: usize) -> Task<Message> {
                 self.tabs[i].properties.active_field = None;
                 let handles = self.property_target_handles(i);
                 if !handles.is_empty() {
+                    let evaluates_expression = self.tabs[i]
+                        .properties
+                        .sections
+                        .iter()
+                        .flat_map(|section| section.props.iter())
+                        .find(|property| property.field == field)
+                        .is_some_and(|property| {
+                            matches!(property.value, PropValue::EditText(_))
+                        });
                     if let Some(raw_val) = self.tabs[i]
                         .properties
                         .edit_buf
                         .remove(&crate::ui::properties::FieldKey::Geom(field))
                     {
-                        // Block names are free-form text — a name like "10-5"
-                        // must not be arithmetic-evaluated.
-                        let val = if field == "block" {
-                            raw_val
-                        } else {
+                        let val = if evaluates_expression {
                             crate::app::expr_eval::eval_to_string(&raw_val)
+                        } else {
+                            raw_val
                         };
                         if matches!(field, "current_fit_point" | "current_control_point") {
                             let count = handles

src/entities/attribute.rs

@@ -417,17 +417,17 @@ impl PropertyEditable for AttributeDefinition {
             Property {
                 label: t!("Tag").into_owned(),
                 field: "att_tag",
-                value: PropValue::EditText(self.tag.clone()),
+                value: PropValue::PlainText(self.tag.clone()),
             },
             Property {
                 label: t!("Prompt").into_owned(),
                 field: "att_prompt",
-                value: PropValue::EditText(self.prompt.clone()),
+                value: PropValue::PlainText(self.prompt.clone()),
             },
             Property {
                 label: t!("Value").into_owned(),
                 field: "att_default",
-                value: PropValue::EditText(self.default_value.clone()),
+                value: PropValue::PlainText(self.default_value.clone()),
             },
             Property {
                 label: t!("Style").into_owned(),
@@ -698,13 +698,13 @@ impl PropertyEditable for AttributeEntity {
                     Property {
                         label: t!("Tag").into_owned(),
                         field: "atte_tag",
-                        value: PropValue::EditText(self.tag.clone()),
+                        value: PropValue::PlainText(self.tag.clone()),
                     },
                     ro(t!("Prompt").as_ref(), "atte_prompt", String::new()),
                     Property {
                         label: t!("Value").into_owned(),
                         field: "atte_val",
-                        value: PropValue::EditText(self.value.clone()),
+                        value: PropValue::PlainText(self.value.clone()),
                     },
                     Property {
                         label: t!("Style").into_owned(),

src/entities/dimension.rs

@@ -19,19 +19,19 @@ fn base_props(base: &DimensionBase) -> Vec<crate::scene::model::object::Property
         crate::scene::model::object::Property {
             label: t!("Text").into_owned(),
             field: "text",
-            value: crate::scene::model::object::PropValue::EditText(base.text.clone()),
+            value: crate::scene::model::object::PropValue::PlainText(base.text.clone()),
         },
         crate::scene::model::object::Property {
             label: t!("User Text").into_owned(),
             field: "user_text",
-            value: crate::scene::model::object::PropValue::EditText(
+            value: crate::scene::model::object::PropValue::PlainText(
                 base.user_text.clone().unwrap_or_default(),
             ),
         },
         crate::scene::model::object::Property {
             label: t!("Style").into_owned(),
             field: "style_name",
-            value: crate::scene::model::object::PropValue::EditText(base.style_name.clone()),
+            value: crate::scene::model::object::PropValue::PlainText(base.style_name.clone()),
         },
         edit(t!("Text X").as_ref(), "text_x", base.text_middle_point.x),
         edit(t!("Text Y").as_ref(), "text_y", base.text_middle_point.y),
@@ -4129,4 +4129,3 @@ mod arch_format_tests {
     }
 }
 
-

src/entities/extended.rs

@@ -34,7 +34,7 @@ fn text_prop(label: &str, field: &'static str, value: &str) -> Property {
     Property {
         label: label.into(),
         field,
-        value: PropValue::EditText(value.to_string()),
+        value: PropValue::PlainText(value.to_string()),
     }
 }
 

src/entities/leader.rs

@@ -291,7 +291,7 @@ fn properties(leader: &Leader) -> Vec<PropSection> {
         Property {
             label: t!("Dim style").into_owned(),
             field: "dimension_style",
-            value: PropValue::EditText(leader.dimension_style.clone()),
+            value: PropValue::PlainText(leader.dimension_style.clone()),
         },
         choice_prop(
             t!("Type").as_ref(),

src/entities/mline.rs

@@ -337,7 +337,7 @@ impl PropertyEditable for MLine {
                 Property {
                     label: t!("Style").into_owned(),
                     field: "ml_style",
-                    value: PropValue::EditText(self.style_name.clone()),
+                    value: PropValue::PlainText(self.style_name.clone()),
                 },
                 Property {
                     label: t!("Style justification").into_owned(),

src/entities/mtext.rs

@@ -260,7 +260,7 @@ fn properties(t: &MText, text_style_names: &[String]) -> Vec<PropSection> {
                 Property {
                     label: t!("Contents").into_owned(),
                     field: "content",
-                    value: PropValue::EditText(t.value.clone()),
+                    value: PropValue::PlainText(t.value.clone()),
                 },
                 Property {
                     label: t!("Style").into_owned(),

src/entities/multileader.rs

@@ -715,7 +715,7 @@ fn properties(ml: &MultiLeader) -> Vec<PropSection> {
             Property {
                 label: t!("Contents").into_owned(),
                 field: "text_string",
-                value: PropValue::EditText(ctx.text_string.clone()),
+                value: PropValue::PlainText(ctx.text_string.clone()),
             },
             // Text-style name resolved from text_style_handle by the panel builder.
             ro(t!("Text style").as_ref(), "text_style_handle", "Standard"),

src/entities/text.rs

@@ -279,7 +279,7 @@ fn properties(t: &Text, text_style_names: &[String]) -> Vec<PropSection> {
                 Property {
                     label: t!("Contents").into_owned(),
                     field: "content",
-                    value: PropValue::EditText(t.value.clone()),
+                    value: PropValue::PlainText(t.value.clone()),
                 },
                 Property {
                     label: t!("Style").into_owned(),

src/scene/cache/properties.rs

@@ -86,7 +86,7 @@ pub fn general_section(entity: &EntityType) -> PropSection {
             Property {
                 label: t!("Hyperlink").into_owned(),
                 field: "hyperlink",
-                value: PropValue::EditText(hyperlink),
+                value: PropValue::PlainText(hyperlink),
             },
         ],
     };

src/scene/model/object.rs

@@ -8,8 +8,10 @@ use glam::DVec3;
 pub enum PropValue {
     /// Read-only display text.
     ReadOnly(String),
-    /// Editable numeric/text field.
+    /// Editable numeric field.
     EditText(String),
+    /// Editable text that must not be expression-evaluated.
+    PlainText(String),
     /// Layer name — rendered as a combo_box.
     LayerChoice(String),
     /// Generic string choice rendered as a combo_box.

src/scene/selection.rs

@@ -417,6 +417,7 @@ impl Scene {
                             ])
                         } else {
                             match prop.value {
+                                PropValue::PlainText(_) => QSelectValueEditor::Text,
                                 PropValue::ReadOnly(ref value)
                                 | PropValue::EditText(ref value) => {
                                     let field = prop.field.to_ascii_lowercase();
@@ -614,7 +615,9 @@ impl Scene {
                     .flat_map(|s| s.props)
                     .find(|p| p.field == field)?;
                 Some(match prop.value {
-                    PropValue::ReadOnly(s) | PropValue::EditText(s) => s,
+                    PropValue::ReadOnly(s)
+                    | PropValue::EditText(s)
+                    | PropValue::PlainText(s) => s,
                     PropValue::LayerChoice(s) => s,
                     PropValue::Choice { selected, .. } => selected,
                     PropValue::EditChoice { value, .. } => value,

src/ui/properties.rs

@@ -314,7 +314,9 @@ pub fn build_field_key_map(
     for section in sections {
         for prop in &section.props {
             let key = match &prop.value {
-                PropValue::EditText(_) => Some(FieldKey::Geom(prop.field)),
+                PropValue::EditText(_) | PropValue::PlainText(_) => {
+                    Some(FieldKey::Geom(prop.field))
+                }
                 PropValue::AttrText { tag, .. } => Some(FieldKey::Attr(tag.clone())),
                 _ => None,
             };
@@ -765,7 +767,9 @@ impl PropertiesPanel {
             }
             PropValue::BoolToggle { field, value } => render_bool_row(label, *field, *value),
             PropValue::Stepper { display, .. } => render_stepper_row(label, display),
-            PropValue::EditText(val) => self.render_edit_row(label, prop.field, val),
+            PropValue::EditText(val) | PropValue::PlainText(val) => {
+                self.render_edit_row(label, prop.field, val)
+            }
             PropValue::ReadOnly(val) if prop.field == "annotative_scale" => {
                 render_annotative_scale_row(label, val)
             }