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C与YAML的解析

YAML是”YAML Ain’t a Markup Language”(YAML不是一种标记语言)的递归缩写。在开发的这种语言时,YAML 的意思其实是:”Yet Another Markup Language”(仍是一种标记语言),但为了强调这种语言以数据做为中心,而不是以标记语言为重点,而用反向缩略语重命名。

YAML 的语法和其他高级语言类似,并且可以简单表达清单、散列表,标量等数据形态

适用场景:

  • 脚本语言
  • 序列化
  • 配置文件

C语言解析库:https://pyyaml.org/wiki/LibYAML

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git clone https://github.com/yaml/libyaml

安装依赖库

  • ubuntu
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    sudo apt install libyaml-dev

示例

配置文件

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# config/public.yaml

title : Finex 2011
img_url : /finex/html/img/
css_url : /finex/html/style/
js_url : /finex/html/js/

template_dir: html/templ/

default_act : idx # used for invalid/missing act=

pages:
- act : idx
title : Welcome
html : public/welcome.phtml
- act : reg
title : Register
html : public/register.phtml
- act : log
title : Log in
html : public/login.phtml
- act : out
title : Log out
html : public/logout.phtml

解析代码

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#include <stdio.h>
#include <yaml.h>

int main(void)
{
FILE *fh = fopen("public.yaml", "r");
yaml_parser_t parser;
yaml_token_t token; /* new variable */

/* Initialize parser */
if(!yaml_parser_initialize(&parser))
fputs("Failed to initialize parser!\n", stderr);
if(fh == NULL)
fputs("Failed to open file!\n", stderr);

/* Set input file */
yaml_parser_set_input_file(&parser, fh);

/* BEGIN new code */
do {
yaml_parser_scan(&parser, &token);
switch(token.type){
/* Stream start/end */
case YAML_STREAM_START_TOKEN:
puts("STREAM START"); break;
case YAML_STREAM_END_TOKEN:
puts("STREAM END"); break;
/* Token types (read before actual token) */
case YAML_KEY_TOKEN:
printf("(Key token) "); break;
case YAML_VALUE_TOKEN:
printf("(Value token) "); break;
/* Block delimeters */
case YAML_BLOCK_SEQUENCE_START_TOKEN:
puts("<b>Start Block (Sequence)</b>"); break;
case YAML_BLOCK_ENTRY_TOKEN:
puts("<b>Start Block (Entry)</b>"); break;
case YAML_BLOCK_END_TOKEN:
puts("<b>End block</b>"); break;
/* Data */
case YAML_BLOCK_MAPPING_START_TOKEN:
puts("[Block mapping]"); break;
case YAML_SCALAR_TOKEN:
printf("scalar %s \n", token.data.scalar.value); break;
/* Others */
default:
printf("Got token of type %d\n", token.type);
}
if(token.type != YAML_STREAM_END_TOKEN)
yaml_token_delete(&token);
} while(token.type != YAML_STREAM_END_TOKEN);
yaml_token_delete(&token);
/* END new code */

/* Cleanup */
yaml_parser_delete(&parser);
fclose(fh);
return 0;
}

解析结果

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$./a.out 
STREAM START
[Block mapping]
(Key token) scalar title
(Value token) scalar Finex 2011
(Key token) scalar img_url
(Value token) scalar /finex/html/img/
(Key token) scalar css_url
(Value token) scalar /finex/html/style/
(Key token) scalar js_url
(Value token) scalar /finex/html/js/
(Key token) scalar template_dir
(Value token) scalar html/templ/
(Key token) scalar default_act
(Value token) scalar idx
(Key token) scalar pages
(Value token) <b>Start Block (Sequence)</b>
<b>Start Block (Entry)</b>
[Block mapping]
(Key token) scalar act
(Value token) scalar idx
(Key token) scalar title
(Value token) scalar Welcome
(Key token) scalar html
(Value token) scalar public/welcome.phtml
<b>End block</b>
<b>Start Block (Entry)</b>
[Block mapping]
(Key token) scalar act
(Value token) scalar reg
(Key token) scalar title
(Value token) scalar Register
(Key token) scalar html
(Value token) scalar public/register.phtml
<b>End block</b>
<b>Start Block (Entry)</b>
[Block mapping]
(Key token) scalar act
(Value token) scalar log
(Key token) scalar title
(Value token) scalar Log in
(Key token) scalar html
(Value token) scalar public/login.phtml
<b>End block</b>
<b>Start Block (Entry)</b>
[Block mapping]
(Key token) scalar act
(Value token) scalar out
(Key token) scalar title
(Value token) scalar Log out
(Key token) scalar html
(Value token) scalar public/logout.phtml
<b>End block</b>
<b>End block</b>
<b>End block</b>
STREAM END

参考

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  • 本文作者: Winddoing
  • 本文链接: https://winddoing.github.io/post/865ecfcc.html
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