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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [exp/] [html/] [render.go] - Blame information for rev 747

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1

jeremybenn

// Copyright 2011 The Go Authors. All rights reserved.

2

// Use of this source code is governed by a BSD-style

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// license that can be found in the LICENSE file.

4

5

package html

6

7

import (

8

        "bufio"

9

        "errors"

10

        "fmt"

11

        "io"

12

        "strings"

13

14

15

type writer interface {

16

        io.Writer

17

        WriteByte(byte) error

18

        WriteString(string) (int, error)

19

20

21

// Render renders the parse tree n to the given writer.

22

//

23

// Rendering is done on a 'best effort' basis: calling Parse on the output of

24

// Render will always result in something similar to the original tree, but it

25

// is not necessarily an exact clone unless the original tree was 'well-formed'.

26

// 'Well-formed' is not easily specified; the HTML5 specification is

27

// complicated.

28

//

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// Calling Parse on arbitrary input typically results in a 'well-formed' parse

30

// tree. However, it is possible for Parse to yield a 'badly-formed' parse tree.

31

// For example, in a 'well-formed' parse tree, no  element is a child of

32

// another  element: parsing "" results in two sibling elements.

33

// Similarly, in a 'well-formed' parse tree, no  element is a child of a

34

//  element: parsing "
" results in a  with two sibling
      
      
         35
         
         
         // children; the  is reparented to the 's parent. However, calling
      
      
         36
         
         
         // Parse on "" does not return an error, but the result has an 
      
      
         37
         
         
         // element with an  child, and is therefore not 'well-formed'.
      
      
         38
         
         
         //
      
      
         39
         
         
         // Programmatically constructed trees are typically also 'well-formed', but it
      
      
         40
         
         
         // is possible to construct a tree that looks innocuous but, when rendered and
      
      
         41
         
         
         // re-parsed, results in a different tree. A simple example is that a solitary
      
      
         42
         
         
         // text node would become a tree containing ,  and  elements.
      
      
         43
         
         
         // Another example is that the programmatic equivalent of "abc"
      
      
         44
         
         
         // becomes "abc".
      
      
         45
         
         
         func Render(w io.Writer, n *Node) error {
      
      
         46
         
         
                 if x, ok := w.(writer); ok {
      
      
         47
         
         
                         return render(x, n)
      
      
         48
         
         
                 }
      
      
         49
         
         
                 buf := bufio.NewWriter(w)
      
      
         50
         
         
                 if err := render(buf, n); err != nil {
      
      
         51
         
         
                         return err
      
      
         52
         
         
                 }
      
      
         53
         
         
                 return buf.Flush()
      
      
         54
         
         
         }
      
      
         55
         
         
          
      
      
         56
         
         
         // plaintextAbort is returned from render1 when a  element</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>57</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>// has been rendered. No more end tags should be rendered after that.</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>58</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>var plaintextAbort = errors.New("html: internal error (plaintext abort)")</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>59</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>&nbsp;</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>60</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>func render(w writer, n *Node) error {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>61</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        err := render1(w, n)</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>62</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        if err == plaintextAbort {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>63</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                err = nil</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>64</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>65</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>66</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>}</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>67</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>&nbsp;</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>68</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>func render1(w writer, n *Node) error {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>69</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        // Render non-element nodes; these are the easy cases.</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>70</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        switch n.Type {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>71</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        case ErrorNode:</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>72</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                return errors.New("html: cannot render an ErrorNode node")</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>73</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        case TextNode:</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>74</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                return escape(w, n.Data)</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>75</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        case DocumentNode:</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>76</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                for _, c := range n.Child {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>77</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        if err := render1(w, c); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>78</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>79</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>80</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>81</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                return nil</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>82</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        case ElementNode:</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>83</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                // No-op.</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>84</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        case CommentNode:</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>85</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                if _, err := w.WriteString("<!--"); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>86</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>87</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>88</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                if _, err := w.WriteString(n.Data); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>89</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>90</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>91</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                if _, err := w.WriteString("-->"); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>92</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>93</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>94</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                return nil</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>95</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        case DoctypeNode:</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>96</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                if _, err := w.WriteString("<!DOCTYPE "); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>97</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>98</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>99</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                if _, err := w.WriteString(n.Data); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>100</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>101</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>102</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                if n.Attr != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>103</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        var p, s string</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>104</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        for _, a := range n.Attr {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>105</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                switch a.Key {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>106</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                case "public":</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>107</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                        p = a.Val</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>108</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                case "system":</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>109</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                        s = a.Val</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>110</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>111</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>112</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        if p != "" {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>113</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                if _, err := w.WriteString(" PUBLIC "); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>114</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                        return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>115</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>116</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                if err := writeQuoted(w, p); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>117</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                        return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>118</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>119</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                if s != "" {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>120</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                        if err := w.WriteByte(' '); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>121</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>122</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>123</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                        if err := writeQuoted(w, s); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>124</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>125</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>126</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>127</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        } else if s != "" {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>128</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                if _, err := w.WriteString(" SYSTEM "); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>129</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                        return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>130</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>131</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                if err := writeQuoted(w, s); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>132</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                        return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>133</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>134</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>135</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>136</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                return w.WriteByte('>')</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>137</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        default:</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>138</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                return errors.New("html: unknown node type")</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>139</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>140</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>&nbsp;</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>141</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        // Render the <xxx> opening tag.</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>142</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        if err := w.WriteByte('<'); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>143</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>144</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>145</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        if _, err := w.WriteString(n.Data); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>146</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>147</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>148</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        for _, a := range n.Attr {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>149</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                if err := w.WriteByte(' '); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>150</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>151</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>152</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                if a.Namespace != "" {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>153</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        if _, err := w.WriteString(a.Namespace); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>154</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>155</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>156</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        if err := w.WriteByte(':'); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>157</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>158</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>159</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>160</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                if _, err := w.WriteString(a.Key); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>161</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>162</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>163</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                if _, err := w.WriteString(`="`); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>164</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>165</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>166</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                if err := escape(w, a.Val); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>167</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>168</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>169</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                if err := w.WriteByte('"'); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>170</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>171</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>172</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>173</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        if voidElements[n.Data] {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>174</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                if len(n.Child) != 0 {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>175</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        return fmt.Errorf("html: void element <%s> has child nodes", n.Data)</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>176</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>177</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                _, err := w.WriteString("/>")</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>178</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>179</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>180</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        if err := w.WriteByte('>'); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>181</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>182</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>183</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>&nbsp;</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>184</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        // Add initial newline where there is danger of a newline beging ignored.</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>185</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        if len(n.Child) > 0 && n.Child[0].Type == TextNode && strings.HasPrefix(n.Child[0].Data, "\n") {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>186</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                switch n.Data {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>187</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                case "pre", "listing", "textarea":</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>188</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        if err := w.WriteByte('\n'); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>189</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>190</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>191</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>192</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>193</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>&nbsp;</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>194</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        // Render any child nodes.</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>195</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        switch n.Data {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>196</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        case "iframe", "noembed", "noframes", "noscript", "plaintext", "script", "style", "xmp":</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>197</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                for _, c := range n.Child {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>198</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        if c.Type != TextNode {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>199</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                return fmt.Errorf("html: raw text element <%s> has non-text child node", n.Data)</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>200</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>201</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        if _, err := w.WriteString(c.Data); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>202</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>203</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>204</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>205</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                if n.Data == "plaintext" {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>206</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        // Don't render anything else. <plaintext> must be the</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>207</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        // last element in the file, with no closing tag.</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>208</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        return plaintextAbort</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>209</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>210</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        case "textarea", "title":</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>211</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                for _, c := range n.Child {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>212</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        if c.Type != TextNode {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>213</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                return fmt.Errorf("html: RCDATA element <%s> has non-text child node", n.Data)</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>214</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>215</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        if err := render1(w, c); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>216</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>217</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>218</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>219</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        default:</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>220</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                for _, c := range n.Child {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>221</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        if err := render1(w, c); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>222</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>223</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>224</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>225</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>226</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>&nbsp;</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>227</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        // Render the </xxx> closing tag.</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>228</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        if _, err := w.WriteString("</"); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>229</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>230</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>231</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        if _, err := w.WriteString(n.Data); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>232</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>233</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>234</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        return w.WriteByte('>')</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>235</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>}</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>236</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>&nbsp;</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>237</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>// writeQuoted writes s to w surrounded by quotes. Normally it will use double</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>238</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>// quotes, but if s contains a double quote, it will use single quotes.</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>239</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>// It is used for writing the identifiers in a doctype declaration.</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>240</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>// In valid HTML, they can't contain both types of quotes.</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>241</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>func writeQuoted(w writer, s string) error {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>242</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        var q byte = '"'</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>243</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        if strings.Contains(s, `"`) {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>244</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                q = '\''</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>245</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>246</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        if err := w.WriteByte(q); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>247</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>248</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>249</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        if _, err := w.WriteString(s); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>250</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>251</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>252</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        if err := w.WriteByte(q); err != nil {</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>253</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>                return err</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>254</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        }</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>255</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        return nil</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>256</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>}</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>257</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>&nbsp;</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>258</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>// Section 12.1.2, "Elements", gives this list of void elements. Void elements</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>259</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>// are those that can't have any contents.</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>260</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>var voidElements = map[string]bool{</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>261</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "area":    true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>262</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "base":    true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>263</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "br":      true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>264</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "col":     true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>265</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "command": true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>266</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "embed":   true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>267</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "hr":      true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>268</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "img":     true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>269</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "input":   true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>270</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "keygen":  true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>271</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "link":    true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>272</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "meta":    true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>273</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "param":   true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>274</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "source":  true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>275</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "track":   true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>276</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>        "wbr":     true,</code></pre></td>
      </tr>
      <tr valign="middle">
         <td>277</td>
         <td></td>
         <td></td>
         <td class="code"><pre><code>}</code></pre></td>
      </tr>
   </tbody>
</table>


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