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Type safe templating (with mustache) #128

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Type safe templating (with mustache) #128

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cbaf192
Cleanup in ppx build.
Drup Apr 13, 2018
af435ae
Mass rename.
Drup Apr 13, 2018
674195c
Keep renaming.
Drup Apr 13, 2018
a92cf8d
Add conditional simplification for markup_to_expr.
Drup Apr 18, 2016
15d6029
Add mustache templates.
Drup Apr 17, 2016
3a1918d
Add a test.
Drup Apr 18, 2016
715dca5
Use locations reported by the new mustache parser.
Drup Feb 25, 2017
f0dc427
WIP.
Drup Apr 13, 2018
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93 changes: 46 additions & 47 deletions ppx/ppx_attribute_value.ml → ppx/attribute_value.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -20,14 +20,13 @@
[@@@ocaml.warning "-3"]

open Ast_helper
module Pc = Ppx_common

type 'a gparser =
?separated_by:string -> ?default:string -> Location.t -> string -> 'a ->
Parsetree.expression option

type parser = string gparser
type vparser = string Pc.value gparser
type vparser = string Common.value gparser

(* Handle expr *)

Expand Down Expand Up @@ -72,7 +71,7 @@ let list
delimiter separated_by element_parser ?separated_by:_ ?default:_ loc name s =

exp_list delimiter separated_by element_parser loc name s
|> Ppx_common.list loc
|> Common.list loc
|> fun e -> Some e

let spaces = list (Re_str.regexp " +") "space"
Expand All @@ -91,8 +90,8 @@ let wrap (parser : parser) implementation =
expr @@
fun ?separated_by:_ ?default:_ loc name s ->
match parser loc name s with
| None -> Ppx_common.error loc "wrap applied to presence; nothing to wrap"
| Some e -> Some (Ppx_common.wrap implementation loc e)
| None -> Common.error loc "wrap applied to presence; nothing to wrap"
| Some e -> Some (Common.wrap implementation loc e)

let nowrap (parser : parser) _ =
expr @@
Expand All @@ -116,7 +115,7 @@ let must_be_a
| None -> singular_description
in

Ppx_common.error loc "Value of %s must be %s" name description
Common.error loc "Value of %s must be %s" name description



Expand All @@ -134,12 +133,12 @@ let group_matched index s =
with Not_found -> false

let int_exp loc s =
try Some (Ppx_common.int loc (int_of_string s))
try Some (Common.int loc (int_of_string s))
with Failure _ -> None

let float_exp loc s =
try
Some (Ppx_common.float loc @@ float_of_string s)
Some (Common.float loc @@ float_of_string s)
with Failure _ ->
None

Expand All @@ -154,22 +153,22 @@ let char ?separated_by:_ ?default:_ loc name s =
let open Markup.Encoding in

let report _ error =
Ppx_common.error loc "%s in attribute %s"
Common.error loc "%s in attribute %s"
(Markup.Error.to_string error |> String.capitalize) name
in
let decoded = string s |> decode ~report utf_8 in

let c =
match next decoded with
| None -> Ppx_common.error loc "No character in attribute %s" name
| None -> Common.error loc "No character in attribute %s" name
| Some i when i <= 255 -> Char.chr i
| Some _ ->
Ppx_common.error loc "Character out of range in attribute %s" name
Common.error loc "Character out of range in attribute %s" name
in

begin match next decoded with
| None -> ()
| Some _ -> Ppx_common.error loc "Multiple characters in attribute %s" name
| Some _ -> Common.error loc "Multiple characters in attribute %s" name
end;

Some (with_default_loc loc @@ fun () -> Ast_convenience.char c)
Expand All @@ -179,7 +178,7 @@ let onoff ?separated_by:_ ?default:_ loc name s =
| "" | "on" -> true
| "off" -> false
| _ ->
Ppx_common.error loc {|Value of %s must be "on", "" or "off"|} name
Common.error loc {|Value of %s must be "on", "" or "off"|} name
in
Some (bool_exp loc b)

Expand All @@ -188,15 +187,15 @@ let bool ?separated_by:_ ?default:_ loc name s =
| "" | "true" -> true
| "false" -> false
| _ ->
Ppx_common.error loc {|Value of %s must be "true", "" or "false"|} name
Common.error loc {|Value of %s must be "true", "" or "false"|} name
in
Some (bool_exp loc b)

let unit ?separated_by:_ ?default:_ loc name s =
if s = "" || s = name then
Some (Ast_convenience.(with_default_loc loc unit))
else
Ppx_common.error loc
Common.error loc
{|Value of %s must be %s or "".|}
name name

Expand All @@ -218,8 +217,8 @@ let points ?separated_by:_ ?default:_ loc name s =
let expressions = spaces_or_commas_ float loc name s in

let rec pair acc = function
| [] -> List.rev acc |> Ppx_common.list loc
| [_] -> Ppx_common.error loc "Unpaired coordinate in %s" name
| [] -> List.rev acc |> Common.list loc
| [_] -> Common.error loc "Unpaired coordinate in %s" name
| ex::ey::rest -> pair (([%expr [%e ex], [%e ey]] [@metaloc loc])::acc) rest
in

Expand All @@ -230,7 +229,7 @@ let number_pair ?separated_by:_ ?default:_ loc name s =
begin match spaces_or_commas_ float loc name s with
| [orderx] -> [%expr [%e orderx], None]
| [orderx; ordery] -> [%expr [%e orderx], Some [%e ordery]]
| _ -> Ppx_common.error loc "%s requires one or two numbers" name
| _ -> Common.error loc "%s requires one or two numbers" name
end [@metaloc loc]
in

Expand All @@ -241,29 +240,29 @@ let fourfloats ?separated_by:_ ?default:_ loc name s =
| [min_x; min_y; width; height] ->
Some [%expr ([%e min_x], [%e min_y], [%e width], [%e height])]
[@metaloc loc]
| _ -> Ppx_common.error loc "Value of %s must be four numbers" name
| _ -> Common.error loc "Value of %s must be four numbers" name

(* These are always in a list; hence the error message. *)
let icon_size =
let regexp = Re_str.regexp "\\([0-9]+\\)[xX]\\([0-9]+\\)" in

fun ?separated_by:_ ?default:_ loc name s ->
if not @@ does_match regexp s then
Ppx_common.error loc "Value of %s must be a %s, or %s"
Common.error loc "Value of %s must be a %s, or %s"
name "space-separated list of icon sizes, such as 16x16" "any";

let width, height =
try
int_of_string (Re_str.matched_group 1 s),
int_of_string (Re_str.matched_group 2 s)
with Invalid_argument _ ->
Ppx_common.error loc "Icon dimension out of range in %s" name
Common.error loc "Icon dimension out of range in %s" name
in

Some
[%expr
[%e Ppx_common.int loc width],
[%e Ppx_common.int loc height]] [@metaloc loc]
[%e Common.int loc width],
[%e Common.int loc height]] [@metaloc loc]



Expand All @@ -284,7 +283,7 @@ let svg_quantity =
let n =
match float_exp loc (Re_str.matched_group 1 s) with
| Some n -> n
| None -> Ppx_common.error loc "Number out of range in %s" name
| None -> Common.error loc "Number out of range in %s" name
in

let unit_string = Re_str.matched_group 4 s in
Expand All @@ -307,7 +306,7 @@ let svg_length =
| "pt" -> [%expr `Pt]
| "px" -> [%expr `Px]
| "%" -> [%expr `Percent]
| s -> Ppx_common.error loc "Invalid length unit %s in %s" s name
| s -> Common.error loc "Invalid length unit %s in %s" s name
end [@metaloc loc]
in

Expand All @@ -322,7 +321,7 @@ let angle_ =
| "deg" -> [%expr `Deg]
| "rad" -> [%expr `Rad]
| "grad" -> [%expr `Grad]
| s -> Ppx_common.error loc "Invalid angle unit %s in %s" s name
| s -> Common.error loc "Invalid angle unit %s in %s" s name
end [@metaloc loc]
in

Expand All @@ -333,7 +332,7 @@ let angle ?separated_by ?default loc name s =

let offset =
let bad_form name loc =
Ppx_common.error loc "Value of %s must be a number or percentage" name in
Common.error loc "Value of %s must be a number or percentage" name in

let regexp = Re_str.regexp "\\([-+0-9eE.]+\\)\\(%\\)?" in

Expand All @@ -356,7 +355,7 @@ let transform =

fun ?separated_by:_ ?default:_ loc name s ->
if not @@ does_match regexp s then
Ppx_common.error loc "Value of %s must be an SVG transform" name;
Common.error loc "Value of %s must be an SVG transform" name;

let kind = Re_str.matched_group 1 s in
let values = Re_str.matched_group 2 s in
Expand All @@ -368,22 +367,22 @@ let transform =
| [a; b; c; d; e; f] ->
[%expr `Matrix ([%e a], [%e b], [%e c], [%e d], [%e e], [%e f])]
| _ ->
Ppx_common.error loc "%s: matrix requires six numbers" name
Common.error loc "%s: matrix requires six numbers" name
end

| "translate" ->
begin match spaces_or_commas_ float loc "translate" values with
| [tx; ty] -> [%expr `Translate ([%e tx], Some [%e ty])]
| [tx] -> [%expr `Translate ([%e tx], None)]
| _ ->
Ppx_common.error loc "%s: translate requires one or two numbers" name
Common.error loc "%s: translate requires one or two numbers" name
end

| "scale" ->
begin match spaces_or_commas_ float loc "scale" values with
| [sx; sy] -> [%expr `Scale ([%e sx], Some [%e sy])]
| [sx] -> [%expr `Scale ([%e sx], None)]
| _ -> Ppx_common.error loc "%s: scale requires one or two numbers" name
| _ -> Common.error loc "%s: scale requires one or two numbers" name
end

| "rotate" ->
Expand All @@ -395,18 +394,18 @@ let transform =
[%expr `Rotate
([%e angle_ loc "rotate" a], Some ([%e cx], [%e cy]))]
| _ ->
Ppx_common.error loc "%s: rotate center requires two numbers" name
Common.error loc "%s: rotate center requires two numbers" name
end
| _ ->
Ppx_common.error loc
Common.error loc
"%s: rotate requires an angle and an optional center" name
end

| "skewX" -> [%expr `SkewX [%e angle_ loc "skewX" values]]

| "skewY" -> [%expr `SkewY [%e angle_ loc "skewY" values]]

| s -> Ppx_common.error loc "%s: %s is not a valid transform type" name s
| s -> Common.error loc "%s: %s is not a valid transform type" name s
end [@metaloc loc]
in

Expand All @@ -433,7 +432,7 @@ let variant ?separated_by:_ ?default:_ loc _ s =
let total_variant (unary, nullary) ?separated_by:_ ?default:_ loc _name s =
let variand = variand s in
if List.mem variand nullary then Some (Exp.variant ~loc variand None)
else Some (Exp.variant ~loc unary (Some (Ppx_common.string loc s)))
else Some (Exp.variant ~loc unary (Some (Common.string loc s)))



Expand All @@ -456,20 +455,20 @@ let paint_without_icc loc _name s =
in

match icc_color_start with
| None -> [%expr `Color ([%e Ppx_common.string loc s], None)]
| None -> [%expr `Color ([%e Common.string loc s], None)]
| Some i ->
let icc_color = Re_str.matched_group 1 s in
let color = String.sub s 0 i in
[%expr `Color
([%e Ppx_common.string loc color],
Some [%e Ppx_common.string loc icc_color])]
([%e Common.string loc color],
Some [%e Common.string loc icc_color])]
end [@metaloc loc]

let paint ?separated_by:_ ?default:_ loc name s =
if not @@ Re_str.string_match (Re_str.regexp "url(\\([^)]+\\))") s 0 then
Some (paint_without_icc loc name s)
else
let iri = Re_str.matched_group 1 s |> Ppx_common.string loc in
let iri = Re_str.matched_group 1 s |> Common.string loc in
let remainder_start = Re_str.group_end 0 in
let remainder_length = String.length s - remainder_start in
let remainder =
Expand All @@ -491,13 +490,13 @@ let srcset_element =
let e =
begin match Re_str.bounded_split space s 2 with
| [url] ->
[%expr `Url [%e Ppx_common.string loc url]]
[%expr `Url [%e Common.string loc url]]

| [url; descriptor] ->
let bad_descriptor () =
Ppx_common.error loc "Bad width or density descriptor in %s" name in
Common.error loc "Bad width or density descriptor in %s" name in

let url = Ppx_common.string loc url in
let url = Common.string loc url in
let suffix_index = String.length descriptor - 1 in

let is_width =
Expand All @@ -513,7 +512,7 @@ let srcset_element =
match int_exp loc (String.sub descriptor 0 suffix_index) with
| Some n -> n
| None ->
Ppx_common.error loc "Bad number for width in %s" name
Common.error loc "Bad number for width in %s" name
in

[%expr `Url_width ([%e url], [%e n])]
Expand All @@ -523,12 +522,12 @@ let srcset_element =
match float_exp loc (String.sub descriptor 0 suffix_index) with
| Some n -> n
| None ->
Ppx_common.error loc "Bad number for pixel density in %s" name
Common.error loc "Bad number for pixel density in %s" name
in

[%expr `Url_pixel ([%e url], [%e n])]

| _ -> Ppx_common.error loc "Missing URL in %s" name
| _ -> Common.error loc "Missing URL in %s" name
end [@metaloc loc]
in

Expand All @@ -537,7 +536,7 @@ let srcset_element =
let number_or_datetime ?separated_by:_ ?default:_ loc _ s =
match int_exp loc s with
| Some n -> Some [%expr `Number [%e n]]
| None -> Some [%expr `Datetime [%e Pc.string loc s]]
| None -> Some [%expr `Datetime [%e Common.string loc s]]
[@metaloc loc]


Expand All @@ -552,6 +551,6 @@ let in2 = in_

let xmlns ?separated_by:_ ?default:_ loc name s =
if s <> Markup.Ns.html then
Ppx_common.error loc "%s: namespace must be %s" name Markup.Ns.html;
Common.error loc "%s: namespace must be %s" name Markup.Ns.html;

Some [%expr `W3_org_1999_xhtml] [@metaloc loc]
6 changes: 3 additions & 3 deletions ppx/ppx_attribute_value.mli → ppx/attribute_value.mli
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@ type 'a gparser =
?separated_by:string -> ?default:string -> Location.t -> string -> 'a ->
Parsetree.expression option
type parser = string gparser
type vparser = string Ppx_common.value gparser
type vparser = string Common.value gparser
(** Attribute value parsers are assigned to each attribute depending on the type
of the attribute's argument, though some attributes have special parsers
based on their name, or on a [[@@reflect]] annotation. A parser is a
Expand Down Expand Up @@ -76,11 +76,11 @@ val spaces_or_commas : parser -> parser
(** {3 Top combinators}
Exported parsers should always use one of those combinators last. *)

val wrap : parser -> Ppx_common.lang -> vparser
val wrap : parser -> Common.lang -> vparser
(** [wrap parser module_ _ _ s] applies [parser _ _ s] to get a parse tree for
[e], then evaluates to the parse tree for [module_.Xml.W.return e]. *)

val nowrap : parser -> Ppx_common.lang -> vparser
val nowrap : parser -> Common.lang -> vparser
(** [nowrap parser _ _ _ s] evaluates to [parser _ _ s]. The purpose of this
combinator is to provide a signature similar to [wrap] in situations where
wrapping is not wanted. *)
Expand Down