parent
f8a799abfb
commit
9dabc237e0
2 changed files with 87 additions and 32 deletions
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@ -8,8 +8,8 @@ pub fn main() !void {
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&.{ "5", "4", "3", "2", "1" },
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&.{ "5", "4", "3", "2", "1" },
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},
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.qux = true,
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.quxx = false,
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.qux = false,
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.quxx = true,
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});
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}
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@ -55,7 +55,10 @@ fn executeStatement(writer: anytype, comptime stmt: Statement, args: anytype, ca
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if (condition) {
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try executeTemplate(writer, subtemplate, args, captures);
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} else {
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if (if_stmt.else_branch) |branch| try executeTemplate(writer, branch, args, captures);
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if (if_stmt.else_branch) |branch| switch (branch) {
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.@"else" => |subtmpl| try executeTemplate(writer, subtmpl, args, captures),
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.elif => |elif| try executeStatement(writer, .{ .@"if" = elif.* }, args, captures),
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};
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}
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},
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//else => @compileError("TODO"),
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@ -141,6 +144,48 @@ const TemplateParseResult = struct {
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closing_block: ?ControlBlock,
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};
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fn parseIfBlock(
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comptime header: IfHeader,
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comptime tokens: []const TemplateToken,
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comptime start: usize,
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) ParseResult(usize, If) {
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const subtemplate = parseTemplate(tokens, start, .if_block);
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switch (subtemplate.closing_block.?.block) {
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.end_if => return .{
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.new_iter = subtemplate.new_idx,
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.item = If{
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.header = header,
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.subtemplate = subtemplate.items,
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.else_branch = null,
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},
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},
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.@"else" => {
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const else_subtemplate = parseTemplate(tokens, subtemplate.new_idx + 1, .if_else_block);
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return .{
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.new_iter = else_subtemplate.new_idx,
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.item = If{
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.header = header,
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.subtemplate = subtemplate.items,
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.else_branch = .{ .@"else" = else_subtemplate.items },
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},
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};
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},
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.elif_header => |elif_header| {
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const else_if = parseIfBlock(elif_header, tokens, subtemplate.new_idx + 1);
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return .{
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.new_iter = else_if.new_iter,
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.item = If{
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.header = header,
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.subtemplate = subtemplate.items,
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.else_branch = .{ .elif = &else_if.item },
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},
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};
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},
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else => unreachable,
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}
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}
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fn parseTemplate(
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comptime tokens: []const TemplateToken,
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comptime start: usize,
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@ -155,9 +200,12 @@ fn parseTemplate(
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switch (tokens[i]) {
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.text => |text| current_text = current_text ++ text,
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.whitespace => |wsp| {
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if (i != tokens.len - 1 and tokens[i + 1] == .control_block)
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if (tokens[i + 1].control_block.strip_before)
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continue;
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if (i != tokens.len - 1 and tokens[i + 1] == .control_block) {
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if (tokens[i + 1].control_block.strip_before) continue;
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}
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if (i != 0 and tokens[i - 1] == .control_block) {
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if (tokens[i - 1].control_block.strip_after) continue;
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}
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current_text = current_text ++ wsp;
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},
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.control_block => |cb| {
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@ -169,27 +217,13 @@ fn parseTemplate(
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switch (cb.block) {
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.expression => |expr| items = items ++ [_]TemplateItem{.{ .statement = .{ .expression = expr } }},
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.if_header => |header| {
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if (i != tokens.len - 1 and tokens[i + 1] == .whitespace and cb.strip_after) i += 1;
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const subtemplate = parseTemplate(tokens, i + 1, .if_block);
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i = subtemplate.new_idx;
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const else_subtemplate: ?TemplateParseResult = if (subtemplate.closing_block.?.block == .@"else")
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parseTemplate(tokens, i + 1, .if_else_block)
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else
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null;
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if (else_subtemplate) |sub| i = sub.new_idx;
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const parsed = parseIfBlock(header, tokens, i + 1);
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i = parsed.new_iter;
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items = items ++ [_]TemplateItem{.{
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.statement = .{
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.@"if" = .{
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.subtemplate = subtemplate.items,
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.header = header,
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.else_branch = if (else_subtemplate) |sub| sub.items else null,
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},
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},
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.statement = .{ .@"if" = parsed.item },
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}};
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},
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.for_header => |header| {
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if (i != tokens.len - 1 and tokens[i + 1] == .whitespace and cb.strip_after) i += 1;
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const subtemplate = parseTemplate(tokens, i + 1, .for_block);
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items = items ++ [_]TemplateItem{.{
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.statement = .{
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@ -209,17 +243,15 @@ fn parseTemplate(
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break cb
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else
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@compileError("Unexpected /if tag"),
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.elif_header => if (template_type == .if_block)
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break cb
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else
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@compileError("Unexpected #elif tag"),
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.@"else" => if (template_type == .if_block)
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break cb
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else
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@compileError("Unexpected #else tag"),
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}
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if (i != tokens.len - 1 and tokens[i] == .control_block) {
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if (tokens[i].control_block.strip_after and tokens[i + 1] == .whitespace) {
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i += 1;
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}
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}
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},
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}
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} else null;
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@ -340,6 +372,11 @@ fn parseControlBlock(comptime tokens: ControlTokenIter) ParseResult(ControlToken
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break .{ .if_header = result.item };
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},
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.@"else" => break .{ .@"else" = {} },
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.@"elif" => {
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const result = parseIfHeader(iter);
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iter = result.new_iter;
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break .{ .elif_header = result.item };
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},
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//else => @compileError("TODO"),
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}
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@ -522,7 +559,10 @@ const ForHeader = struct {
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const If = struct {
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subtemplate: []const TemplateItem,
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header: IfHeader,
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else_branch: ?[]const TemplateItem,
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else_branch: ?union(enum) {
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@"else": []const TemplateItem,
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elif: *const If,
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},
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};
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const IfHeader = struct {
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@ -543,6 +583,7 @@ const ControlBlock = struct {
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if_header: IfHeader,
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end_if: void,
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@"else": void,
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elif_header: IfHeader,
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};
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block: Data,
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strip_before: bool,
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@ -553,6 +594,7 @@ const Keyword = enum {
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@"for",
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@"if",
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@"else",
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@"elif",
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};
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const EndKeyword = enum {
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@ -646,4 +688,12 @@ test "template" {
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try testCase("{#if .val}1{/if}", .{ .val = true }, "1");
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try testCase("{#for .vals |$v|}{$v}{/for}", .{ .vals = [_]u8{ 1, 2, 3 } }, "123");
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try testCase("{#for .vals |$v|=} {$v} {=/for}", .{ .vals = [_]u8{ 1, 2, 3 } }, "123");
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try testCase("{#if .val}1{#else}0{/if}", .{ .val = true }, "1");
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try testCase("{#if .val}1{#else}0{/if}", .{ .val = false }, "0");
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try testCase("{#if .val}1{#elif .foo}2{/if}", .{ .val = false, .foo = true }, "2");
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try testCase("{#if .val}1{#elif .foo}2{/if}", .{ .val = false, .foo = false }, "");
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try testCase("{#if .val}1{#elif .foo}2{#else}0{/if}", .{ .val = false, .foo = false }, "0");
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try testCase("{#if .val}1{#elif .foo}2{#else}0{/if}", .{ .val = true, .foo = false }, "1");
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try testCase("{#if .val}1{#elif .foo}2{#else}0{/if}", .{ .val = false, .foo = true }, "2");
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try testCase("{#if .val}1{#elif .foo}2{#else}0{/if}", .{ .val = true, .foo = true }, "1");
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}
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@ -14,8 +14,13 @@
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{$b}:
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{= /for =}
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{= /for}
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{#if .qux}qux{#else}!qux{/if}
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{#if .quxx}quxx{#else}!quxx{/if}
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{#if .qux=}
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qux
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{=#elif .quxx=}
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quxx
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{=#else=}
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neither
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{=/if}
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</section>
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</body>
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</html>
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