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Combine Expressions and statements

This commit is contained in:
jaina heartles 2022-11-16 00:06:53 -08:00
parent 8ebe77541f
commit 61493dc797
1 changed files with 23 additions and 33 deletions
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56
src/template/lib.zig
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@ -99,7 +99,7 @@ fn parseTemplate(comptime tokens: TokenIter, comptime template_type: TemplateTyp
items = items ++ [_]TemplateItem{.{ .text = current_text }};
current_text = "";
}
const result = parseStatement(iter);
const result = parseExpressionOrStatement(iter, true);
iter = result.new_iter;
if (result.item == .end_for) {
if (template_type == .subtemplate) break :parse_loop else @compileError("Unexpected end statement");
@ -129,12 +129,16 @@ fn parseTemplate(comptime tokens: TokenIter, comptime template_type: TemplateTyp
}
}
fn parseStatement(comptime tokens: TokenIter) ParseResult(Statement) {
fn parseExpressionOrStatement(
comptime tokens: TokenIter,
comptime as_statement: bool,
) ParseResult(if (as_statement) Statement else Expression) {
comptime {
var iter = tokens;
var stmt: Statement = while (iter.next()) |token| switch (token) {
.whitespace => {},
.pound => {
if (!as_statement) @compileError("Unexpected Token");
const next = iter.next() orelse @compileError("Unexpected end of template");
if (next != .text) @compileError("Expected keyword following '#' character");
const text = next.text;
@ -164,23 +168,25 @@ fn parseStatement(comptime tokens: TokenIter) ParseResult(Statement) {
iter = names.new_iter;
break .{ .expression = .{ .capture_deref = names.item } };
},
else => @compileError(""),
else => if (as_statement) @compileError("TODO") else break,
};
// search for end of statement
while (iter.next()) |token| switch (token) {
.whitespace => {},
.close_bracket => return .{
.new_iter = iter,
.item = stmt,
},
else => {
@compileLog(iter.row);
@compileError("TODO" ++ @tagName(token));
},
};
if (as_statement) {
// search for end of statement
while (iter.next()) |token| switch (token) {
.whitespace => {},
.close_bracket => return .{
.new_iter = iter,
.item = stmt,
},
else => {
@compileLog(iter.row);
@compileError("TODO" ++ @tagName(token));
},
};
@compileError("Unexpected end of template");
@compileError("Unexpected end of template");
} else return .{ .new_iter = iter, .item = stmt.expression };
}
}
@ -208,7 +214,7 @@ fn endStatement(comptime tokens: TokenIter) TokenIter {
fn parseForLoop(comptime tokens: TokenIter) ParseResult(ForLoop) {
comptime {
const iterable = parseExpression(tokens);
const iterable = parseExpressionOrStatement(tokens, false);
var iter = iterable.new_iter;
iter = skipWhitespace(iter);
@ -237,22 +243,6 @@ fn parseForLoop(comptime tokens: TokenIter) ParseResult(ForLoop) {
}
}
fn parseExpression(comptime tokens: TokenIter) ParseResult(Expression) {
comptime {
var iter = tokens;
while (iter.next()) |token| switch (token) {
.whitespace => {},
.period => {
const names = parseDeref(iter);
return .{ .new_iter = names.new_iter, .item = .{ .arg_deref = names.item } };
},
else => @compileError("Expected Expression"),
};
@compileError("Unexpected end of template");
}
}
fn parseDeref(comptime tokens: TokenIter) ParseResult([]const []const u8) {
comptime {
var iter = tokens;