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// The parser processes a list of mustache tokens created in
// the compiler into a list of templater useable nodes.
// Nodes contain only the necessary information to be used
// to seek out appropriate data for injection.
use compiler::Token;
use compiler::Token::{Text, Variable, OTag, CTag, Raw, Partial, Comment};
use self::Node::*;
use self::ParserStatus::*;
// Node signifies the data structure used by the template to
// determine how to correctly implement data. Each Node type
// stores the variable name as well as the raw tag for use by
// lambdas.
#[derive(PartialEq, Eq, Clone, Debug)]
pub enum Node<'a> {
Static(&'a str), // (text)
Value(&'a str, String), // (name, tag)
Section(&'a str, Vec<Node<'a>>, bool, String, String), /* (name, children, inverted, otag, ctag) */
Unescaped(&'a str, String), // (name, tag)
Part(&'a str, &'a str), // // (name, tag)
}
#[derive(PartialEq, Eq, Debug)]
enum ParserStatus {
Parse,
// Sect,
Skip,
}
trait LocalStringExt {
fn is_whitespace(&self) -> bool;
}
impl LocalStringExt for String {
fn is_whitespace(&self) -> bool {
self.chars().all(|c| c.is_whitespace())
}
}
impl LocalStringExt for str {
fn is_whitespace(&self) -> bool {
self.chars().all(|c| c.is_whitespace())
}
}
// Parse list of tokens into instruction nodes
// Section nodes will be handled recursively
pub fn parse_nodes<'a>(list: &Vec<Token<'a>>) -> Vec<Node<'a>> {
let mut nodes: Vec<Node> = vec![];
let mut it = list.iter().enumerate().peekable();
let mut status = Parse;
loop {
// Iterate while still nodes in the list
match it.next() {
Some((i, token)) => {
match token {
&Text(text) => nodes.push(parse_text_node(text, &mut status)),
&Variable(name, raw) => nodes.push(parse_variable_node(name, raw)),
&Raw(name, raw) => nodes.push(parse_raw_node(name, raw)),
&Partial(name, raw) => nodes.push(Part(name, raw)),
// Unopened closing tags are ignored
// TODO: Return a parser error?
&CTag(_, _) => continue,
&OTag(name, inverted, raw) => {
let mut children: Vec<Token<'a>> = vec![];
let mut count = 0u32;
let mut otag_count = 1u32;
for item in list[i + 1..].iter() {
count += 1;
match *item {
OTag(title, _, _) => {
if title == name {
otag_count += 1;
}
children.push((*item).clone());
}
CTag(title, temp) => {
if title == name && otag_count == 1 {
nodes.push(Section(name,
parse_nodes(&children).clone(),
inverted,
raw.to_string(),
temp.to_string()));
break;
} else if title == name && otag_count > 1 {
otag_count -= 1;
children.push((*item).clone());
} else {
children.push((*item).clone());
continue;
}
}
_ => {
children.push((*item).clone());
continue;
}
}
}
// Advance the iterator to the position of the CTAG. If the
// OTag is never closed, these children will never be processed.
// TODO: Return a parser warning in the case of an unclosed tag?
while count > 1 {
it.next();
count -= 1;
}
}
&Comment => {
// Check the next element for whitespace
match it.peek() {
Some(&(_, token)) => {
match parse_comment_node(token, &mut status, &mut nodes) {
true => {
// it.next();
}
false => {}
}
}
None => {
match nodes.last().unwrap() {
&Static(text) => {
if text.is_whitespace() {
nodes.pop();
}
}
_ => continue,
}
}
}
}
}
}
None => break,
}
}
// Return the populated list of nodes
nodes
}
// Helper function for handling the creation of a text node
fn parse_text_node<'a>(text: &'a str, status: &mut ParserStatus) -> Node<'a> {
match *status {
_ => {
if text.contains("\n") {
*status = Skip;
} else if text.is_whitespace() {
*status = Skip;
}
return Static(text);
}
}
}
// Helper function for handling the creation of a variable node
fn parse_variable_node<'a>(name: &'a str, raw: &'a str) -> Node<'a> {
let dot_notation = name.contains(".");
match dot_notation {
false => return Value(name, raw.to_string()),
true => {
let parts: Vec<&str> = name.split(".").collect();
let node = handle_dot_notation(&parts[..], false, false);
return node;
}
}
}
// Helper function for handling the creation of an unescaped variable node
fn parse_raw_node<'a>(name: &'a str, raw: &'a str) -> Node<'a> {
let dot_notation = name.contains(".");
let ampersand = raw.contains("&");
match dot_notation {
false => {
return Unescaped(name, raw.to_string());
}
true => {
let parts: Vec<&str> = name.split(".").collect();
match ampersand {
true => {
let node = handle_dot_notation(&parts[..], true, true);
return node;
}
false => {
let node = handle_dot_notation(&parts[..], true, false);
return node;
}
};
}
}
}
// Helper function for handling the creation of comment nodes and
// properly handle whitespace
fn parse_comment_node<'a>(token: &Token,
status: &mut ParserStatus,
nodes: &mut Vec<Node<'a>>)
-> bool {
match *token {
Text(ref value) => {
match *status {
Skip => {
// If whitespace and should skip, advance to next token
if value.is_whitespace() {
match nodes.last().unwrap() {
&Static(text) => {
// If the previous node is whitespace and has a newline
// then remove it
if text.is_whitespace() && text.contains("\n") {
nodes.pop();
}
}
_ => {}
}
*status = Parse;
return true;
} else {
*status = Parse;
return false;
}
}
Parse => return false,
// Sect => return false,
}
}
_ => return false,
}
}
// Recursively handle tag names that utilize dot notation shorthand
fn handle_dot_notation<'a>(parts: &[&'a str], unescaped: bool, amp: bool) -> Node<'a> {
let variable = parts[0];
match parts.len() {
// Determine if the remaining portion of the tag name is the
// variable or another section.
1 => {
match unescaped {
// Determine if the matching tag is unesecaped or normal.
true => {
match amp {
true => {
let mut var = "{{&".to_string();
var.push_str(variable);
var.push_str("}}");
return Unescaped(variable, var);
}
false => {
let mut var = "{{{".to_string();
var.push_str(variable);
var.push_str("}}}");
return Unescaped(variable, var);
}
}
}
false => {
let mut var = "{{".to_string();
var.push_str(variable);
var.push_str("}}");
return Value(variable, var);
}
}
}
_ => {
let mut otag = "{{#".to_string();
let mut ctag = "{{/".to_string();
otag.push_str(variable);
otag.push_str("}}");
ctag.push_str(variable);
ctag.push_str("}}");
// Enter recursion and assign the results as children.
return Section(variable,
vec![handle_dot_notation(&parts[1..], unescaped, amp)],
false,
otag,
ctag);
}
}
}
#[cfg(test)]
mod parser_tests {
use compiler::Token;
use compiler::Token::{Text, Variable, OTag, CTag, Raw, Partial};
use parser;
use parser::Node;
use parser::Node::{Static, Value, Section, Unescaped, Part};
#[test]
fn parse_dot_notation_simple() {
let tokens: Vec<Token> = vec![Variable("section.child_tag", "{{ section.child_tag }}")];
let nodes = parser::parse_nodes(&tokens);
let expected: Vec<Node> = vec![Section("section",
vec![Value("child_tag",
"{{child_tag}}".to_string())],
false,
"{{#section}}".to_string(),
"{{/section}}".to_string())];
assert_eq!(nodes, expected);
}
#[test]
fn parse_dot_notation_triple_mustache() {
let tokens: Vec<Token> = vec![Raw("section.child_tag", "{{{ section.child_tag }}}")];
let nodes = parser::parse_nodes(&tokens);
let expected: Vec<Node> = vec![Section("section",
vec![Unescaped("child_tag",
"{{{child_tag}}}".to_string())],
false,
"{{#section}}".to_string(),
"{{/section}}".to_string())];
assert_eq!(nodes, expected);
}
#[test]
fn parse_dot_notation_ampersand() {
let tokens: Vec<Token> = vec![Raw("section.child_tag", "{{& section.child_tag }}")];
let nodes = parser::parse_nodes(&tokens);
let expected: Vec<Node> = vec![Section("section",
vec![Unescaped("child_tag",
"{{&child_tag}}".to_string())],
false,
"{{#section}}".to_string(),
"{{/section}}".to_string())];
assert_eq!(nodes, expected);
}
#[test]
fn parse_nested_dot_notation_basic() {
let tokens: Vec<Token> = vec![Variable("section.child.tag", "{{ section.child.tag }}")];
let nodes = parser::parse_nodes(&tokens);
let expected: Vec<Node> = vec![Section("section",
vec![Section("child",
vec![Value("tag",
"{{tag}}".to_string())],
false,
"{{#child}}".to_string(),
"{{/child}}".to_string())],
false,
"{{#section}}".to_string(),
"{{/section}}".to_string())];
assert_eq!(nodes, expected);
}
#[test]
fn parse_nested_dot_notation_triple_mustache() {
let tokens: Vec<Token> = vec![Raw("section.child.tag", "{{{ section.child.tag }}}")];
let nodes = parser::parse_nodes(&tokens);
let expected: Vec<Node> =
vec![Section("section",
vec![Section("child",
vec![Unescaped("tag", "{{{tag}}}".to_string())],
false,
"{{#child}}".to_string(),
"{{/child}}".to_string())],
false,
"{{#section}}".to_string(),
"{{/section}}".to_string())];
assert_eq!(nodes, expected);
}
#[test]
fn parse_nested_dot_notation_ampersand() {
let tokens: Vec<Token> = vec![Raw("section.child.tag", "{{& section.child.tag }}")];
let nodes = parser::parse_nodes(&tokens);
let expected: Vec<Node> =
vec![Section("section",
vec![Section("child",
vec![Unescaped("tag", "{{&tag}}".to_string())],
false,
"{{#child}}".to_string(),
"{{/child}}".to_string())],
false,
"{{#section}}".to_string(),
"{{/section}}".to_string())];
assert_eq!(nodes, expected);
}
#[test]
fn parse_static() {
let tokens: Vec<Token> = vec![Text("Static String ")];
let nodes = parser::parse_nodes(&tokens);
let expected: Vec<Node> = vec![Static("Static String ")];
assert_eq!(nodes, expected);
}
#[test]
fn parse_value() {
let tokens: Vec<Token> = vec![Variable("token", "{{ token }}")];
let nodes = parser::parse_nodes(&tokens);
let expected: Vec<Node> = vec![Value("token", "{{ token }}".to_string())];
assert_eq!(nodes, expected);
}
#[test]
fn parse_section() {
let tokens: Vec<Token> = vec![OTag("section", false, "{{# section }}"),
Variable("child_tag", "{{ child_tag }}"),
CTag("section", "{{/ section }}")];
let nodes = parser::parse_nodes(&tokens);
let expected: Vec<Node> = vec![Section("section",
vec![Value("child_tag",
"{{ child_tag }}".to_string())],
false,
"{{# section }}".to_string(),
"{{/ section }}".to_string())];
assert_eq!(nodes, expected);
}
#[test]
fn parse_inverted() {
let tokens: Vec<Token> = vec![OTag("inverted", true, "{{^ inverted }}"),
Variable("child_tag", "{{ child_tag }}"),
CTag("inverted", "{{/ inverted }}")];
let nodes = parser::parse_nodes(&tokens);
let expected: Vec<Node> = vec![Section("inverted",
vec![Value("child_tag",
"{{ child_tag }}".to_string())],
true,
"{{^ inverted }}".to_string(),
"{{/ inverted }}".to_string())];
assert_eq!(nodes, expected);
}
#[test]
fn parse_unescaped() {
let tokens: Vec<Token> = vec![Raw("unescaped", "{{& unescaped }}")];
let nodes = parser::parse_nodes(&tokens);
let expected: Vec<Node> = vec![Unescaped("unescaped", "{{& unescaped }}".to_string())];
assert_eq!(nodes, expected);
}
#[test]
fn parse_partial() {
let tokens: Vec<Token> = vec![Partial("new", "{{> new }}")];
let nodes = parser::parse_nodes(&tokens);
let expected: Vec<Node> = vec![Part("new", "{{> new }}")];
assert_eq!(nodes, expected);
}
#[test]
fn parse_all() {
let tokens: Vec<Token> = vec![Text("Static String "),
Variable("token", "{{ token }}"),
OTag("section", false, "{{# section }}"),
Variable("child_tag", "{{ child_tag }}"),
CTag("section", "{{/ section }}"),
Partial("new", "{{> new }}"),
Raw("unescaped", "{{& unescaped }}")];
let nodes = parser::parse_nodes(&tokens);
let static_node = Static("Static String ");
let value_node = Value("token", "{{ token }}".to_string());
let section_node = Section("section",
vec![Value("child_tag", "{{ child_tag }}".to_string())],
false,
"{{# section }}".to_string(),
"{{/ section }}".to_string());
let file_node = Part("new", "{{> new }}");
let undescaped_node = Unescaped("unescaped", "{{& unescaped }}".to_string());
let expected: Vec<Node> =
vec![static_node, value_node, section_node, file_node, undescaped_node];
assert_eq!(nodes, expected);
}
}