Module interpolate 

Resolving the {...} placeholders a template carries.

A <for> body and a fragment body are written with placeholders standing in for what the iteration or the instantiation brings: {row.name}, {$index}, {$theme}. Turning a template into an instance means walking the subtree and replacing each of them with the value its scope holds.

This lives here, below both consumers, because the desktop reconciler and the web emitter write the same text into the same node a tick apart. Two resolvers would drift, and a drift shows up as a page the browser rebuilds on load rather than adopts.

A placeholder whose scope is absent is left in the string verbatim, so the walk that owns that scope resolves it later: a fragment walk resolves its arguments and leaves {row.name} standing for the <for> walk inside it.

Structs

Row

One iteration of a <for> body: the record its placeholders read and the index they count from.

Scope

The scopes a placeholder can resolve against.

Traits

Globals

Where a global placeholder reads its value.

Functions

carries_placeholder

Whether any string substitute_attrs resolves carries a {.

element_carries_placeholder

Whether anything a substitution resolves on element carries a {: its own strings, and the arguments a use site passes.

resolve

Replace every {...} token in text with what its scope holds.

substitute_attrs

The attributes to build an element with, once the placeholders in its own strings are resolved against scope.

substitute_element

Walk a template subtree, resolving every placeholder in its string-valued attributes and its text against scope.