# 变量赋值

Testing Is Documentation

tests/View/Compiler/CompilerAssignTest.php

可以在模板中进行一些变量的赋值，以便于进行后续计算处理。

# node 版本

assign 标签也是用于页面快捷赋值，这个还是用起来比较方便。

public function testBaseUse(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        <assign name="helloWorld" value="say hello to the world" />
        <assign name="test.hello" value="hello" />
        eot;

    $compiled = <<<'eot'
        <?php $helloWorld = 'say hello to the world'; ?>
        <?php $test->hello = 'hello'; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

# node 版本.初始化为 Null 值

public function testNode(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        <assign name="test.hello" />
        eot;

    $compiled = <<<'eot'
        <?php $test->hello = null; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

# node 版本.初始化为指定变量

public function testNode2(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        <assign name="test.hello" value="$hello" />
        eot;

    $compiled = <<<'eot'
        <?php $test->hello = $hello; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

# node 版本.初始化为函数格式化变量

public function testNode3(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        <assign name="test.hello" value="$hello|md5" />
        eot;

    $compiled = <<<'eot'
        <?php $test->hello = md5($hello); ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

# node 版本.初始化为函数格式化占位变量

public function testNode4(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        <assign name="test.hello" value="$hello|test=0,1|foo=**" />
        eot;

    $compiled = <<<'eot'
        <?php $test->hello = foo(test($hello, 0,1)); ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

# JS 风格版本

public function testLet(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        {% let foo = 'foo' %}
        {% let hello = hello . 'foo' %}
        eot;

    $compiled = <<<'eot'
        <?php $foo = 'foo'; ?>
        <?php $hello = $hello . 'foo'; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

# JS 风格版本.初始化值

public function testLet2(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        {% let foo 'foo' %}
        eot;

    $compiled = <<<'eot'
        <?php $foo = 'foo'; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

# JS 风格版本.初始化为 Null 值

public function testLet3(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        {% let foo %}
        eot;

    $compiled = <<<'eot'
        <?php $foo = null; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

# JS 风格版本.初始化为 Null 值带上等于符

public function testLet4(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        {% let foo = %}
        eot;

    $compiled = <<<'eot'
        <?php $foo = null; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

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