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Michael R Sweet
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doc/body.md
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doc/body.md
@ -45,13 +45,13 @@ I then replied with:
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> Given the limited scope of what you use in XML, it should be trivial to code a
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> mini-XML API in a few hundred lines of code.
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I took my own challenge and coded furiously for two days to produced the initial
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I took my own challenge and coded furiously for two days to produce the initial
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public release of Mini-XML, total lines of code: 696. Robert promptly
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integrated Mini-XML into Gutenprint and removed libxml2.
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Thanks to lots of feedback and support from various developers, Mini-XML has
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evolved since then to provide a more complete XML implementation and now stands
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at a whopping 3,839 lines of code, compared to 175,808 lines of code for libxml2
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at a whopping 3,875 lines of code, compared to 175,808 lines of code for libxml2
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version 2.11.7.
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@ -62,6 +62,9 @@ The Mini-XML home page can be found at <https://www.msweet.org/mxml>. From
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there you can download the current version of Mini-XML, access the issue
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tracker, and find other resources.
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Mini-XML v4 has a slightly different API than prior releases. See the
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[Migrating from Mini-XML v3.x](@) chapter for details.
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Legal Stuff
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-----------
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@ -90,17 +93,20 @@ proper compiler and linker options for your installation:
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gcc `pkg-config --cflags mxml4` -o myprogram myprogram.c `pkg-config --libs mxml4`
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> Note: The library name "mxml4" is a configure-time option. If you use the
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> `--disable-libmxml4-prefix` configure option the library is named "mxml".
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Loading an XML File
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-------------------
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You load an XML file using the `mxmlLoadFile` function:
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You load an XML file using the [mxmlLoadFile](@@) function:
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```c
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mxml_node_t *
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mxmlLoadFile(mxml_node_t *top, FILE *fp,
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mxml_load_cb_t load_cb, void *load_cbdata,
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mxml_sax_cb_t sax_cb, void *sax_cbdata);
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mxmlLoadFilename(mxml_node_t *top, const char *filename,
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mxml_load_cb_t load_cb, void *load_cbdata,
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mxml_sax_cb_t sax_cb, void *sax_cbdata);
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```
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The `load_cb` argument specifies a function that assigns child (value) node
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@ -110,18 +116,16 @@ nodes. For example, to load the XML file "filename.xml" containing literal
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strings you can use:
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```c
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FILE *fp;
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mxml_node_t *tree;
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mxml_type_t type = MXML_TYPE_OPAQUE;
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fp = fopen("filename.xml", "r");
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tree = mxmlLoadFile(/*top*/NULL, fp, /*load_cb*/NULL, &type,
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/*sax_cb*/NULL, /*sax_cbdata*/NULL);
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fclose(fp);
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tree = mxmlLoadFilename(/*top*/NULL, "filename.xml",
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/*load_cb*/NULL, /*load_cbdata*/&type,
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/*sax_cb*/NULL, /*sax_cbdata*/NULL);
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```
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Mini-XML also provides functions to load from a named file, a file descriptor,
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or string:
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Mini-XML also provides functions to load from a `FILE` pointer, a file
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descriptor, or string:
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```c
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mxml_node_t *
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@ -130,9 +134,9 @@ mxmlLoadFd(mxml_node_t *top, int fd,
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mxml_sax_cb_t sax_cb, void *sax_cbdata);
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mxml_node_t *
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mxmlLoadFilename(mxml_node_t *top, const char *filename,
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mxml_load_cb_t load_cb, void *load_cbdata,
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mxml_sax_cb_t sax_cb, void *sax_cbdata);
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mxmlLoadFile(mxml_node_t *top, FILE *fp,
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mxml_load_cb_t load_cb, void *load_cbdata,
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mxml_sax_cb_t sax_cb, void *sax_cbdata);
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mxml_node_t *
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mxmlLoadString(mxml_node_t *top, const char *s,
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@ -143,18 +147,19 @@ mxmlLoadString(mxml_node_t *top, const char *s,
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### Load Callbacks
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The `load_xxx` arguments to the `mxmlLoad` functions are a callback function and
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a data pointer which are used to determine the value type of each data node in
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an XML document. The default (`NULL`) callback expects the `load_cbdata`
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argument to be a pointer to a `mxml_type_t` variable - if `NULL` it returns the
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`MXML_TYPE_TEXT` type.
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The `load_xxx` arguments to the mxmlLoadXxx functions are a callback function
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and a data pointer which are used to determine the value type of each data node
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in an XML document. The default (`NULL`) callback expects the `load_cbdata`
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argument to be a pointer to a `mxml_type_t` variable that contains the desired
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value node type - if `NULL`, it uses the `MXML_TYPE_TEXT` (whitespace-separated
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text) type.
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You can provide your own callback functions for more complex XML documents.
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Your callback function will receive a pointer to the current element node and
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must return the value type of the immediate children for that element node:
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You can provide your own callback function for more complex XML documents. Your
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callback function will receive a pointer to the current element node and must
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return the value type of the immediate children for that element node:
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`MXML_TYPE_CUSTOM`, `MXML_TYPE_INTEGER`, `MXML_TYPE_OPAQUE`, `MXML_TYPE_REAL`,
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or `MXML_TYPE_TEXT`. The function is called *after* the element and its
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attributes have been read, so you can look at the element name, attributes, and
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attributes have been read so you can look at the element name, attributes, and
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attribute values to determine the proper value type to return.
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The following callback function looks for an attribute named "type" or the
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@ -162,7 +167,7 @@ element name to determine the value type for its child nodes:
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```c
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mxml_type_t
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type_cb(void *cbdata, mxml_node_t *node)
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my_load_cb(void *cbdata, mxml_node_t *node)
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{
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const char *type;
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@ -174,6 +179,8 @@ type_cb(void *cbdata, mxml_node_t *node)
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type = mxmlElementGetAttr(node, "type");
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if (type == NULL)
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type = mxmlGetElement(node);
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if (type == NULL)
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type = "text";
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if (!strcmp(type, "integer"))
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return (MXML_TYPE_INTEGER);
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@ -186,18 +193,15 @@ type_cb(void *cbdata, mxml_node_t *node)
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}
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```
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To use this callback function, simply use the name when you call any of the load
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To use this callback function, simply specify it when you call any of the load
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functions:
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```c
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FILE *fp;
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mxml_node_t *tree;
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fp = fopen("filename.xml", "r");
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tree = mxmlLoadFile(/*top*/NULL, fp,
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type_cb, /*load_cbdata*/NULL,
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/*sax_cb*/NULL, /*sax_cbata*/NULL);
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fclose(fp);
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tree = mxmlLoadFilename(/*top*/NULL, "filename.xml",
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my_load_cb, /*load_cbdata*/NULL,
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/*sax_cb*/NULL, /*sax_cbdata*/NULL);
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```
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@ -242,7 +246,7 @@ the node tree for the file would look like the following in memory:
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where "-" is a pointer to the sibling node and "|" is a pointer to the first
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child or parent node.
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The `mxmlGetType` function gets the type of a node:
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The [mxmlGetType](@@) function gets the type of a node:
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```c
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mxml_type_t
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@ -261,10 +265,10 @@ mxmlGetType(mxml_node_t *node);
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- `MXML_TYPE_REAL` : A whitespace-delimited floating point value, or
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- `MXML_TYPE_TEXT` : A whitespace-delimited text (fragment) value.
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The parent and sibling nodes are accessed using the `mxmlGetParent`,
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`mxmlGetNextSibling`, and `mxmlGetPreviousSibling` functions, while the children
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of an element node are accessed using the `mxmlGetFirstChild` or
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`mxmlGetLastChild` functions:
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The parent and sibling nodes are accessed using the [mxmlGetParent](@@),
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[mxmlGetNextSibling](@@), and [mxmlGetPreviousSibling](@@) functions, while the
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children of an element node are accessed using the [mxmlGetFirstChild](@@) or
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[mxmlGetLastChild](@@) functions:
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```c
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mxml_node_t *
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@ -283,8 +287,8 @@ mxml_node_t *
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mxmlGetPrevSibling(mxml_node_t *node);
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```
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The `mxmlGetUserData` function gets any user (application) data associated with
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the node:
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The [mxmlGetUserData](@@) function gets any user (application) data associated
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with the node:
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```c
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void *
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39
doc/mxml.3
39
doc/mxml.3
@ -1,4 +1,4 @@
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.TH mxml 3 "Mini-XML API" "2024-03-06" "Mini-XML API"
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.TH mxml 3 "Mini-XML API" "2024-03-07" "Mini-XML API"
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.SH NAME
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mxml \- Mini-XML API
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.SH INCLUDE FILE
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@ -1315,22 +1315,6 @@ bool mxmlSetCustom (
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.fi
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.PP
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The node is not changed if it (or its first child) is not a custom node.
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.SS mxmlSetCustomCallbacks
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Set the handling functions for custom data.
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.PP
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.nf
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void mxmlSetCustomCallbacks (
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mxml_custom_load_cb_t load_cb,
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mxml_custom_save_cb_t save_cb,
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void *cbdata
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);
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.fi
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.PP
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The load function accepts a node pointer and a data string and must
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return 0 on success and non-zero on error.
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.PP
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The save function accepts a node pointer and must return a malloc'd
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string on success and \fBNULL\fR on error.
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.SS mxmlSetDeclaration
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Set a comment to a literal string.
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.PP
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@ -1380,15 +1364,6 @@ bool mxmlSetElement (
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.fi
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.PP
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The node is not changed if it is not an element node.
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.SS mxmlSetErrorCallback
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Set the error message callback.
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.PP
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.nf
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void mxmlSetErrorCallback (
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mxml_error_cb_t cb,
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void *cbdata
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);
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.fi
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.SS mxmlSetInteger
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Set the value of an integer node.
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.PP
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@ -1591,6 +1566,18 @@ SAX event type.
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.nf
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typedef enum mxml_sax_event_e mxml_sax_event_t;
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.fi
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.SS mxml_strcopy_cb_t
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String copy/allocation callback
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.PP
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.nf
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typedef char *(*)(void *cbdata const char *s) mxml_strcopy_cb_t;
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.fi
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.SS mxml_strfree_cb_t
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String free callback
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.PP
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.nf
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typedef void(*)(void *cbdata char *s) mxml_strfree_cb_t;
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.fi
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.SS mxml_type_t
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The XML node type.
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.PP
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BIN
doc/mxml.epub
BIN
doc/mxml.epub
Binary file not shown.
@ -356,13 +356,11 @@ span.string {
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<li><a href="#mxmlSetComment">mxmlSetComment</a></li>
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<li><a href="#mxmlSetCommentf">mxmlSetCommentf</a></li>
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<li><a href="#mxmlSetCustom">mxmlSetCustom</a></li>
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<li><a href="#mxmlSetCustomCallbacks">mxmlSetCustomCallbacks</a></li>
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<li><a href="#mxmlSetDeclaration">mxmlSetDeclaration</a></li>
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<li><a href="#mxmlSetDeclarationf">mxmlSetDeclarationf</a></li>
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<li><a href="#mxmlSetDirective">mxmlSetDirective</a></li>
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<li><a href="#mxmlSetDirectivef">mxmlSetDirectivef</a></li>
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<li><a href="#mxmlSetElement">mxmlSetElement</a></li>
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<li><a href="#mxmlSetErrorCallback">mxmlSetErrorCallback</a></li>
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<li><a href="#mxmlSetInteger">mxmlSetInteger</a></li>
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<li><a href="#mxmlSetOpaque">mxmlSetOpaque</a></li>
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<li><a href="#mxmlSetOpaquef">mxmlSetOpaquef</a></li>
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@ -389,6 +387,8 @@ span.string {
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<li><a href="#mxml_save_cb_t">mxml_save_cb_t</a></li>
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<li><a href="#mxml_sax_cb_t">mxml_sax_cb_t</a></li>
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<li><a href="#mxml_sax_event_t">mxml_sax_event_t</a></li>
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<li><a href="#mxml_strcopy_cb_t">mxml_strcopy_cb_t</a></li>
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<li><a href="#mxml_strfree_cb_t">mxml_strfree_cb_t</a></li>
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<li><a href="#mxml_type_t">mxml_type_t</a></li>
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<li><a href="#mxml_write_cb_t">mxml_write_cb_t</a></li>
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<li><a href="#mxml_ws_t">mxml_ws_t</a></li>
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@ -2600,25 +2600,6 @@ bool mxmlSetCustom(<a href="#mxml_node_t">mxml_node_t</a> *node, void *data, <a
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<p class="description"><code>true</code> on success, <code>false</code> on failure</p>
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<h4 class="discussion">Discussion</h4>
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<p class="discussion">The node is not changed if it (or its first child) is not a custom node.</p>
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<h3 class="function"><a id="mxmlSetCustomCallbacks">mxmlSetCustomCallbacks</a></h3>
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<p class="description">Set the handling functions for custom data.</p>
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<p class="code">
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void mxmlSetCustomCallbacks(<a href="#mxml_custom_load_cb_t">mxml_custom_load_cb_t</a> load_cb, <a href="#mxml_custom_save_cb_t">mxml_custom_save_cb_t</a> save_cb, void *cbdata);</p>
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<h4 class="parameters">Parameters</h4>
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<table class="list"><tbody>
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<tr><th>load_cb</th>
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<td class="description">Load callback function</td></tr>
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<tr><th>save_cb</th>
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<td class="description">Save callback function</td></tr>
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<tr><th>cbdata</th>
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<td class="description">Callback data</td></tr>
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</tbody></table>
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<h4 class="discussion">Discussion</h4>
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<p class="discussion">The load function accepts a node pointer and a data string and must
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return 0 on success and non-zero on error.<br>
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<br>
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The save function accepts a node pointer and must return a malloc'd
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string on success and <code>NULL</code> on error.</p>
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<h3 class="function"><a id="mxmlSetDeclaration">mxmlSetDeclaration</a></h3>
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<p class="description">Set a comment to a literal string.</p>
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<p class="code">
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@ -2690,17 +2671,6 @@ bool mxmlSetElement(<a href="#mxml_node_t">mxml_node_t</a> *node, const char *na
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<p class="description"><code>true</code> on success, <code>false</code> on failure</p>
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<h4 class="discussion">Discussion</h4>
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<p class="discussion">The node is not changed if it is not an element node.</p>
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<h3 class="function"><a id="mxmlSetErrorCallback">mxmlSetErrorCallback</a></h3>
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<p class="description">Set the error message callback.</p>
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<p class="code">
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void mxmlSetErrorCallback(<a href="#mxml_error_cb_t">mxml_error_cb_t</a> cb, void *cbdata);</p>
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<h4 class="parameters">Parameters</h4>
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<table class="list"><tbody>
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<tr><th>cb</th>
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<td class="description">Error callback function</td></tr>
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<tr><th>cbdata</th>
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<td class="description">Error callback data</td></tr>
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</tbody></table>
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<h3 class="function"><a id="mxmlSetInteger">mxmlSetInteger</a></h3>
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<p class="description">Set the value of an integer node.</p>
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<p class="code">
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@ -2932,6 +2902,16 @@ typedef bool (*mxml_sax_cb_t)(void *cbdata <a href="#mxml_node_t">mxml_node_t</a
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<p class="code">
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typedef enum <a href="#mxml_sax_event_e">mxml_sax_event_e</a> mxml_sax_event_t;
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</p>
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<h3 class="typedef"><a id="mxml_strcopy_cb_t">mxml_strcopy_cb_t</a></h3>
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<p class="description">String copy/allocation callback</p>
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<p class="code">
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typedef char *(*mxml_strcopy_cb_t)(void *cbdata const char *s);
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</p>
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<h3 class="typedef"><a id="mxml_strfree_cb_t">mxml_strfree_cb_t</a></h3>
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<p class="description">String free callback</p>
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<p class="code">
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typedef void (*mxml_strfree_cb_t)(void *cbdata char *s);
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</p>
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<h3 class="typedef"><a id="mxml_type_t">mxml_type_t</a></h3>
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<p class="description">The XML node type.</p>
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<p class="code">
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