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template.lm
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template.lm
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import 'os';
var Template;
var TEXT = 'TEXT';
var VALUE = 'VALUE';
var BLOCK = 'BLOCK';
var ELSE = 'ELSE';
var END = 'END';
class Node() {
def __init__(var value) {
self.value = value;
self.children = [];
}
def print(var level) {
var prefix = '';
for (var i = 0; i < level; i+=1) {
prefix += ' ';
}
print(prefix, self);
if (self.children) {
for (var c in self.children) {
c.print(level + 1);
}
}
}
}
class RootNode(Node) {
def render(var dict) {
var values = [];
for (var c in self.children) {
values.append(c.render(dict));
}
return ''.join(values);
}
def __string__() {
return '<RootNode>';
}
}
class TextNode(Node) {
def render(var dict) {
return self.value;
}
def __string__() {
return '<TextNode: "{}">'.format(self.value);
}
}
class ValueNode(Node) {
def render(var dict) {
if ('.' in self.value) {
var name, item;
name, item = self.value.split('.');
return string(dict[name][item]);
}
return string(dict[self.value]);
}
def __string__() {
return '<ValueNode: "{}">'.format(self.value);
}
}
class SetNode(Node) {
def render(var dict) {
var values = [];
for (var c in self.children) {
values.append(c.render(dict));
}
dict[self.value] = ''.join(values);
return '';
}
def __string__() {
return '<SetNode: "{}">'.format(self.value);
}
}
class IfNode(Node) {
def __init__(var *args) {
super().__init__(*args);
self.elsenode = nil;
}
def render(var dict) {
var values = [];
var truth = false;
var left, op, right, value;
left, op, right = self.value.split(' ');
if (op && right) {
if (right[0] == '"') {
value = right[1:-1];
} else if (right[0] in "0123456789") {
value = integer(right[1:-1]);
} else {
value = dict[right];
}
if (op == '==' && dict[left] == value) {
truth = true;
} else if (op == '>' && dict[left] > value) {
truth = true;
} else if (op == '<' && dict[left] < value) {
truth = true;
}
} else {
if (left in dict && dict[left]) {
truth = true;
}
}
if (truth) {
for (var c in self.children) {
values.append(c.render(dict));
}
} else if (self.elsenode) {
for (var c in self.elsenode.children) {
values.append(c.render(dict));
}
}
return ''.join(values);
}
def print(var level) {
super.print(level);
self.elsenode.print(level);
}
def __string__() {
return '<IfNode: "{}">'.format(self.value);
}
}
class ElseNode(Node) {
def render(var dict) {
var values = [];
for (var c in self.children) {
values.append(c.render(dict));
}
return ''.join(values);
}
def __string__() {
return '<ElseNode>';
}
}
class ForNode(Node) {
def render(var dict) {
var values = [];
var item, _, name;
item, _, name = self.value.split(' ');
var value = dict[name];
for (var v in value) {
dict[item] = v;
var children = [];
for (var c in self.children) {
children.append(c.render(dict));
}
values.append(''.join(children));
delete dict[item];
}
return ''.join(values);
}
def __string__() {
return '<ForNode: "{}">'.format(self.value);
}
}
class IncludeNode(Node) {
def render(var dict) {
var file = os.open(self.value);
var content = os.read(file);
os.close(file);
var t = Template(content);
t.compile();
var values = [];
for (var c in self.children) {
values.append(c.render(dict));
}
content = ''.join(values);
var _content_ = '';
if ('_content_' in dict) {
_content_ = dict['_content_'];
}
dict['_content_'] = content;
content = t.render(dict);
dict['_content_'] = _content_;
return content;
}
def __string__() {
return '<IncludeNode: "{}">'.format(self.value);
}
}
class Text() {
def __init__(var text) {
self.text = text;
if (text.startswith('{{') && text.endswith('}}')) {
self.type = VALUE;
self.value = text[2:-2].trim();
} else if (text.startswith('{%') && text.endswith('%}')) {
self.value = text[2:-2].trim();
if (self.value.startswith('end')) {
self.type = END;
} else if (self.value.startswith('else')) {
self.type = ELSE;
} else {
self.type = BLOCK;
}
} else {
self.type = TEXT;
self.value = text;
}
}
def node() {
if (self.type == TEXT) {
return TextNode(self.value);
}
if (self.type == VALUE) {
return ValueNode(self.value);
}
if (self.type == ELSE) {
return ElseNode(self.value);
}
if (self.type == BLOCK) {
if (self.value.startswith('set ')) {
return SetNode(self.value[4:]);
}
if (self.value.startswith('if ')) {
return IfNode(self.value[3:]);
}
if (self.value.startswith('for ')) {
return ForNode(self.value[4:]);
}
if (self.value.startswith('include ')) {
return IncludeNode(self.value[8:]);
}
}
print(self.type, self.value);
print("something wrong\n");
}
def __string__() {
return '<Text: {}, "{}">'.format(self.type, self.value);
}
}
class _Template() {
def __init__(var text) {
var length;
self.texts = [];
var start = 0;
var state = 0; /* 1: {, 2: {{ , 3: {{} 4: {{...}, 5: {% , 6: {%...% */
var i;
length = text.__length__();
for (i = 0; i < length; i += 1) {
var t = text[i];
if (state == 0 && t == '{') {
state = 1;
self.texts.append(Text(text[start:i]));
start = i;
} else if (state == 1 && t == '{') {
state = 2;
} else if (state == 1 && t == '%') {
state = 5;
} else if (state == 2 && t == '}') {
state = 3;
} else if (state == 5 && t == '%') {
state = 6;
} else if (state == 3 && t == '}') {
state = 0;
self.texts.append(Text(text[start:i + 1]));
start = i + 1;
} else if (state == 6 && t == '}') {
state = 0;
self.texts.append(Text(text[start:i + 1]));
start = i + 1;
} else if (state == 1) {
state = 0;
}
}
self.texts.append(Text(text[start:length]));
}
def compile() {
self.root = RootNode(nil);
var stack = [self.root];
for (var t in self.texts) {
var node;
if (t.type == TEXT && t.value) {
node = t.node();
stack[-1].children.append(node);
} else if (t.type == VALUE) {
node = t.node();
stack[-1].children.append(node);
} else if (t.type == BLOCK) {
node = t.node();
stack[-1].children.append(node);
stack.append(node);
} else if (t.type == ELSE) {
node = t.node();
stack[-1].elsenode = node;
stack.append(node);
} else if (t.type == END) {
node = stack.pop();
while (node.__instanceof__(ElseNode)) {
node = stack.pop();
}
}
}
}
def render(var dict) {
return self.root.render(dict);
}
}
Template = _Template;
/*
Value:
{{ foo }} == dict['foo']
{{ foo.bar }} == dict['foo']['bar']
{% if foo }}
hello
{% end %}
==
if (dict['foo']) {
'hello'
}
{% for foo in bar %}
{{foo}}
{% end %}
==
for (var foo in dict['bar']) {
dict['foo'] = foo;
dict['foo'];
}
*/