102 lines
4.4 KiB
Text
102 lines
4.4 KiB
Text
# component_gen2.ludic — L11: a component's props from the parent's attributes, its model for the
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# template (props, state and fields), and its call (functions, events, and `set` of a state)
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function cm_props_src(c: int, px: pointer, rec: pointer) -> pointer {
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var src = `function {px}props(p: pointer, v: Val) -> void {{\n let s: {rec} = p\n`
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var i = 0
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while i < len(g_cm_keep[c]) {
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if g_cm_prop[c][i] {
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let k = g_cm_keep[c][i]
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let got = cm_from(c, g_cm_keep_ty[c][i], "value_get(v, \"" + k + "\")")
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src = src + ` if value_has(v, "{k}") != 0 {{ s.{k} = {got} }}\n`
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}
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i += 1
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}
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return src + "}\n"
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}
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# a template's value as a prop or state of the component's own type
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function cm_from(c: int, ty: pointer, x: pointer) -> pointer {
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if (ty == "Val") { return x }
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if (ty == "int") { return `value_as_int({x})` }
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if (ty == "float") { return `value_as_float({x})` }
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if (ty == "bool") { return `value_as_int({x}) != 0` }
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if (ty == "string") { return `ui_val_text({x})` }
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cm_err(c, `a prop or state is an int, a float, a bool, a string or a Val, not a {ty}`)
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return x
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}
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# the model is filled into the object the instance keeps (ludic.ui's): a scalar field updates its own
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# Value in place, so showing a component allocates nothing for it frame after frame
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function cm_model_src(c: int, px: pointer, rec: pointer, head: Node) -> pointer {
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var src = `function {px}model(p: pointer, o: Val) -> Val {{\n let s: {rec} = p\n`
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var i = 0
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while i < len(g_cm_keep[c]) {
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let k = g_cm_keep[c][i]
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src = src + cm_set(c, g_cm_keep_ty[c][i], k, "s." + k, head)
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i += 1
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}
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i = 0
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while i < len(g_cm_fields[c]) {
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let g = g_cm_fields[c][i]
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src = src + cm_set(c, g.ty, g_cm_fnames[c][i], g.s + "(s)", head)
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i += 1
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}
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return src + " return o\n}\n"
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}
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function cm_set(c: int, ty: pointer, k: pointer, x: pointer, head: Node) -> pointer {
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if (ty == "int") { return ` value_set_int(o, "{k}", {x})\n` }
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if (ty == "float") { return ` value_set_float(o, "{k}", {x})\n` }
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if (ty == "string") { return ` value_set_str(o, "{k}", {x})\n` }
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if (ty == "bool") { return ` value_set_bool(o, "{k}", {x})\n` }
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if (ty == "[]int") { return ` value_set_ints(o, "{k}", {x})\n` }
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if (ty == "[]float") { return ` value_set_floats(o, "{k}", {x})\n` }
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if (ty == "[]string") { return ` value_set_strs(o, "{k}", {x})\n` }
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if (ty == "[]bool") { return ` value_set_bools(o, "{k}", {x})\n` }
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return ` value_put(o, "{k}", {cm_to(c, ty, x, head)})\n`
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}
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function cm_to(c: int, ty: pointer, x: pointer, head: Node) -> pointer {
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if (ty == "Val") { return x }
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let conv = vw_conv(0, ty, x, head)
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if conv == null { cm_err(c, `a {ty} is something a template cannot read`) }
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return conv
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}
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# call(name, args): a function or an event by name, or "set:NAME" for a state the template sets.
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# A name it does not know answers a Value of kind 99, which the runtime reports.
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function cm_call_src(c: int, px: pointer, rec: pointer, head: Node) -> pointer {
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var src = `function {px}call(p: pointer, name: string, args: Val) -> Val {{\n let s: {rec} = p\n`
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let calls = g_cm_calls[c]
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var i = 0
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while i < len(calls) {
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let f = calls[i]
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var args = "s" # 0.S: its states are supplied, not passed
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let lead = len(g_cm_ps[c]) + 1
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var k = lead
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while k < len(f.kids) {
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args = args + ", " + cm_arg(c, f.kids[k], k - lead)
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k += 1
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}
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src = src + ` if name == "{g_cm_cnames[c][i]}" {{\n`
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let call = f.s + "(" + args + ")"
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if f.ty == "void" { src = src + ` {call}\n return value_null()\n` } else {
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let back = cm_to(c, f.ty, call, head)
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src = src + ` return {back}\n`
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}
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src = src + " }\n"
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i += 1
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}
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i = 0
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while i < len(g_cm_keep[c]) {
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if not g_cm_prop[c][i] {
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let k = g_cm_keep[c][i]
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let got = cm_from(c, g_cm_keep_ty[c][i], "value_at(args, 0)")
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src = src + ` if name == "set:{k}" {{\n s.{k} = {got}\n return value_null()\n }}\n`
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}
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i += 1
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}
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return src + " return value_new(99)\n}\n"
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}
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# a parameter out of the template's argument list
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function cm_arg(c: int, p: Node, i: int) -> pointer {
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let at = `value_at(args, {i})`
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if (p.ty == "int") or (p.ty == "float") or (p.ty == "bool") or (p.ty == "string") or (p.ty == "Val") { return cm_from(c, p.ty, at) }
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cm_err(c, `{p.s} is a {p.ty}; a template can pass an int, a float, a bool, a string or a Val`)
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return ""
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}
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